4883 results about "Rejection rate" patented technology

A composite membrane and method for making the same, comprising a porous support and a polyamide surface. The subject membrane provides improved flux and / or rejection rates. The subject membrane is further capable of operating at lower operating pressures. The subject method includes reacting a polyfunctional amine with a polyfunctional acyl halide to form a polyamide. The method includes the step of contacting a complexing agent with the polyfunctional acyl halide prior substantial reaction between the polyfunctional acyl halide and a polyfunctional amine. The subject process is easily adapted to commercial scale manufacturing processes and is particularly suited for making nanofiltration and reverse osmosis composite membranes.

A mail transfer agent adapted for determining the disposition of incoming e-mail from a sender includes a penalty count filter module which functions on the basis of current communication system resource usage, such as the number of concurrent TCP connections being maintained, and penalty counts assigned for cumulative undesirable sender activity such as sending large e-mail files. The penalty count filter module can operate in a selective-rejection state accepting e-mail from senders without a penalty count and randomly accepting other e-mail, and in a random-rejection state rejecting all e-mail from senders with a penalty count and randomly rejecting other e-mail. The rejection rates can be increased or decreased in response to a detected increase or decrease in the usage of system resources.

Provided is a secondary battery of an assemble-type structure, comprising: a cell body including an electrode assembly of cathode / separator / anode sealed therein; and a cap assembly including a protection circuit electrically connected to the cell body so as to control overcharge, overdischarge and overcurrent of the battery and a cap housing covering an upper part of the battery, and being detachably coupled to the cell body. In accordance with the present invention, since the cap assembly including the protection circuit, cap housing and the like is assembled detachably from the cell body and electrically connected to and also can be physically firmly fixed to one another, provided are effects capable of greatly reducing the manufacturing process steps of the battery, and solving all the problems associated with use of battery cases and insert injection molding. Therefore, the present invention can reduce battery production costs and rejection rate, facilitate greater ease of re-working upon occurrence of rejection in particular components and realize more efficient automation of the battery manufacturing process.

A charged particle application circuit pattern inspection apparatus and method are disclosed, in which the reduction in the rejection rate attributable to an out-of-focus state due to the change in the charge condition on the sample surface is prevented and the false information is reduced to improve the apparatus reliability. The image acquisition position on a sample is stored in an image acquisition position storage unit, a focus correction value is stored in a focus correction value storage unit in accordance with the image acquisition position and the sample charge condition, the inspection conditions and the sample to be inspected are input from an input unit, the sample charge condition is evaluated in accordance with the image position acquisition position, and the focal point is corrected by a focus correction unit.

A load balancer allocates requests to a pool of web servers configured to have low queue capacities. If the queue capacity of a web server is reached, the web server responds to an additional request with a rejection notification to the load balancer, which enables the load balancer to quickly send the rejected request to another web server. Each web server self-monitors its rejection rate. If the rejection rate exceeds a threshold, the number of processes concurrently running on the web server is increased. If the rejection rate falls below a threshold, the number of processes concurrently running on the web server is decreased.

The present invention carries out palm rejection on a multi-touch panel. The panel is first touched by a palm before the detection of a finger or pen to define a rejection region and the touch location of the finger or pen is detected outside that rejection region. The present invention, when the rejection region and the touch location of the finger or pen have been detected, is able to continuously detecting a region touched by the palm using a detected range defined by the rejection region to determine whether the rejection region needs to be updated.

The present invention provides an automatic fastening and loosing shoes, which is typically comprised of a shoe body including tongue portion, upper portions and shoe-sole, in which mouthing portions are built on the interfaces of the tongue portion and the upper, said shoe-sole includes an outsole, a middle sole and a bottom filler; said bottom filler is fastened on the middle sole with the front portion so that the middle and heel portions can took off from the middle sole; an action regulating mechanism includes a flutter foil, a pair of guide plates and two inserting strips; said flutter foil is connected to the both sides of the tongue with the both upper ends respectively, cooperating to the guide assembly combined by the guide plates and the inserting strips pre-setting in upper-low position, and connected to the bottom filler at the rear portion with the another end, thereby towing the tongue can bring to the heel portion of the bottom filler simultaneously and relatively moving relative to the outsole cooperating to the attempting action; a control mechanism is consisted of a switch, a hook plate, a stationary guide and a snap frame, said hook plate and said stationary guide are attached on the heel portion of the bottom filler for locking on said snap frame located on the middle sole cooperating to put-on attempting action, and the lock of the hook and the snap frame is released by the switch mounted on the rear end of the shoe-body for carrying out automatic put-off function. The structure has less components and simple features without tying and loosing lace, so that the action of the structure can be carried out smoothly and surely, with low rejection rate and low production cost.

The invention discloses a microbial contamination resistance composite reverse osmosis membrane and a preparation method thereof. The microbial contamination resistance composite reverse osmosis membrane comprises a nonwoven fabric layer, a polysulfone supporting layer and two polyamide surface layer, wherein a second polyamide surface layer which is prepared by reacting nano inorganic antibacterial particle-modified polyamine solution with poly(acylchloride) is formed above a first polyamide surface layer. Compared with the prior art, the composite reverse osmosis membrane prepared by the invention is improved in microbial contamination resistance, surface thickness, mechanical damage resistance and service life for a layer of nano inorganic antibacterial particle-modified polyamide membrane is formed on the surface of the polysulfone supporting layer besides the layer of complete and uniform polyamide membrane. The composite reverse osmosis membrane of the invention has the characteristics of easy preparation and operation and high salt rejection rate and water permeability.

The invention discloses a numerical simulation method for a selective laser melting process. The method comprises a first step of establishment of a finite element model of additive manufacturing process simulation; a second step of meshing on the finite element model of the additive manufacturing process, wherein full-hexahedron meshing is adopted; a third step of definition of printing powder material properties and thermal physical performance parameters which must be determined for temperature field analysis in the additive manufacturing process; a fourth step of loading of a control equation of a mobile heat source; and a fifth step of analysis of thermal stress field and total deformation changes in the additive manufacturing process and after sintering is finished. Through the numerical simulation method for the selective laser melting process, printing parameters can be optimized, and warping and deformation of parts can be prevented; and the method provides effective guidancefor supporting structural design and a printing strategy (speed and direction), lowering the rejection rate and realizing ''success at a time''.

The invention relates to an aviation thin-wall blade compensation processing method and belongs to the field of compensation processing of precision parts in the mechanical engineering field. For the problems that it is hard to predict deformation and error in the blade processing process, and it is difficult to control the processing precision and the like, the method carries out precise predicted compensation processing by obtaining measurement point coordinates of the parts in the processing process and by utilizing the processes of digital modeling, numerical control machining, off-line inspection path planning, point-cloud fitting and processing code regeneration and the like, so that the purposes of on-line measurement and deformation compensation and the like of the aviation thin-wall blades are achieved, the problem of difficult processing deviation suppression in the processing process of free-form surface parts of blades at present is overcome, machining precision of the kind of blades can be improved, rejection rate is reduced, and machining quality of the thin-wall blades are obviously improved.

The invention relates to a parameter setting method of a hot continuous rolling thin slab coiling device and a coiling method of a hot continuous rolling thin slab. The parameters to be set are as follows: an advance speed set value of each set of roller beds = a finish rolling final rack speed set value * (a total roller bed advance rate + advance rate of each set); a lagging speed set value of each set of roller beds = the finish rolling final rack speed set value * a roller bed lagging rate; the side guide plate pressure coefficient is 0.8 + / - 0.15; the side guide plate additional value is from +5 to +10 mm; and the pinch roll is set, and the pinch roll of the coiling device is standardized to ensure the regular standardization, the pinch roll advance rate, pinch roll lagging rate, pinch roll pressure coefficient, upper pinch roll diameter of the coiling device and lower pinch roll diameter of the coiling device. The coiling method is implemented by controlling the coiling device with a computer according to the setting parameters. By using the parameter setting method of the hot continuous rolling thin slab coiling device and the coiling method of the hot continuous rolling thin slab, the surface quality is improved and the rejection rate is reduced.

The invention discloses a composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings, belongs to the technical field of forging, turning, heating and grinding machining of the inner and outer rings of bearing components, and mainly solves the problems of low production efficiency and high rejection rate in a conventional machining method. The composite machining process is mainly characterized by comprising the following steps of: (1) cutting bar stock into straight material sections; (2) after heating, forming a single-forged inner ring and double combined-forged outer rings by using a pressing machine; (3) spheroidizing and annealing; (4) performing shot blasting to remove surface oxide scales; (5) after cutting the double outer rings, performing rough turning and soft grinding; (6) performing additional tempering; (7) performing the soft grinding on the outside diameter of the outer rings, and performing finish turning and rolling; (8) performing heat treatment in quenching and tempering furnaces, and performing shot blasting again; and (9) performing rough grinding machining, the additional tempering, finish grinding machining, super-finishing, cleaning and assembling. The composite machining process has the characteristics of great improvement on product qualification rate and production efficiency, and suitability for batch production on the premise of no increase of equipment investment, and is mainly used for machining the inner and outer rings of the narrow-series thin-walled high-precision conical thin-walled bearings.

The invention discloses an intelligent CNC spring machine used for processing extension springs, compression springs, torsion springs, spiral springs and the like. The intelligent CNC spring machine comprises a straightening mechanism, a wire feeding mechanism, a pitch mechanism, a core seat mechanism, a knife seat mechanism and a computer control system. The pitch mechanism comprises a pitch servo motor and a pitch ball screw pair driving a pitch shaft to move; the core seat mechanism comprises a core seat lifting mechanism and a core rod core-pulling mechanism; and the knife seat mechanism comprises a plurality of sliding knife seats and knife seat driving mechanisms and can move along an arc-shaped track in a radial direction. The spring machine is provided with five sections including a straightening section, a wire feeding section, a pitch section, a core seat section and a knife seat section according to the principle of spring formation, and has reasonable structure design and is driven by a full servo and controlled by a computer so as to realize fully closed loop control and be capable of reducing the rejection rate of finished products. The intelligent CNC spring machine can be widely applied to the production of various extension springs, compression springs, torsion springs, spiral springs and the like, with simple operation, high processing precision and high production efficiency.

Provided is an ice maker, which includes an upper tray, a lower tray, and a rotation shaft. Upper cells of hemispherical shapes are arrayed in the upper tray. Lower cells of hemispherical shapes are arrayed in the lower tray that is rotatably connected to the upper tray. The rotation shaft is connected to a rear end of the lower tray and a rear end of the upper tray to rotate the lower tray relative to the upper tray. A rotation guide part rounded with a predetermined curvature is disposed in a region where the lower tray contacts the upper tray while the lower tray is rotated. The ice maker and ice making method using the same enables the manufacture cost and rejection rate of the ice maker to be reduced, and the ice to be made more rapidly.

The invention relates to a worm-type plastic corrugated pipe grooving machine. Function of conveying plastic corrugated pipes is completed by a worm curve fixed on a cutter bar of a grooving cutter; the functions of cutting and grooving are realized by one alloy cutter head arranged at the terminal of the worm curve, the worm curve is meshed with wave crests of the plastic corrugated pipes, the plastic corrugated pipes advance for one pitch when being pushed by the worm curve once the cutter bar rotates for a circle, namely the plastic corrugated pipes advance to the next wave crest from the current wave crest, the alloy cutter head arranged at the terminal of the worm curve carries out grooving on the current wave crest for once, the alloy cutter head arranged at the terminal of the worm curve is vertical to axes of the plastic corrugated pipes to ensure that a blade is in a cutting interval while the plastic corrugated pipes do not axially move, the plastic corrugated pipes continuously axially move along with rotation of the cutter bar, and the blade carries out grooving on the wave crest one by one. The grooving machine provided by the invention has simple mechanical structure, no independent pipe conveying device or electronic and electrical inductive control system is required, grooving position is accurate, grooving quality is greatly improved, and rejection rate is greatly reduced while grooving efficiency is greatly improved.

The invention belongs to the field of metal machining fluids, and discloses a heavy-load metal machining total synthesis cutting fluid as well as a preparation method and an application thereof. The total synthesis cutting fluid comprises the following components in percentage by weight: 20%-30% of mixed alcohol amine, 6%-9% of anti-rust agents, 4%-6% of special amine, 6%-10% of lubricating agents, 15%-25% of extreme pressure agents, 6%-10% of cosolvents, 1%-2% of water-softening agents, 1%-3% of corrosion inhibitors and the balance of water. The total synthesis cutting fluid disclosed by the invention has excellent lubricating extreme pressure property, can meet the requirement for heavy-load machining, namely reaming, drilling, tapping, threading, broaching, thread machining and the like, of difficult-to-machine materials, namely high-temperature alloy steel, a titanium alloy and the like; a product is green and environment-friendly without containing boron, sodium nitrite, secondary amine, chlorine, phenol, formaldehyde, heavy metals and the like; in addition, the total synthesis cutting fluid disclosed by the invention has excellent anti-rust property, biological stability and machining property, and can enhance the surface quality of a machined part, prolong the service life of a cutter and reduce the rejection rate, thus improving the production efficiency.

The invention discloses a method for forging a steering knuckle; the steering knuckle is prepared by steps of blank making, pre-forging, final-forging and edge trimming of a heated cylindrical blank, wherein (1) in the blank making step, carrying out upsetting treatment on one end of the cylindrical blank, and then flattening the end subjected to the upsetting treatment; (2) in the pre-forging step, forging the manufactured blank by using a closed die, and arranging a trimming cavity extending along the radial direction at a combination part between an upper die cavity and a lower die cavity of the closed die, wherein the periphery of the trimming cavity is connected with a combination surface between the upper die and the lower die; and (3) in the final-forging step, forging a pre-forged piece by using an open die. According to the method, the utilization rate of materials is greatly increased, the production efficiency is improved, and the rejection rate can be reduced.

The invention discloses high-entropy alloy powder for laser cladding and a preparation method of a cladding layer. The high-entropy alloy powder comprises Ti, Zr, V, Nb, Ta and Mo. In addition, high-entropy alloy powder which comprises Ti, Zr, V, Nb, Ta, Mo and W, high-entropy alloy powder which comprises Ti, Zr, V, Nb, Ta, Mo, W and Cr and the preparation method of the cladding layer of the high-entropy alloy powder for laser cladding are provided. The high-entropy alloy powder mainly comprises two characteristics, namely, the high-entropy effect and the cocktail effect, each kind of powder exerts respective advantages, and therefore the cladding layer with high hardness, high corrosion resistance, excellent tempering softening resisting performance and excellent structure performance is obtained. Metallurgical bonding is formed by an alloy layer and a matrix through laser cladding; the bonding strength of the cladding layer and the matrix is greatly improved, and the heating speed is high; metal of the cladding layer is not prone to being diluted by the matrix; little heat deformation is generated; and therefore the part rejection rate is low.

The invention discloses a manufacturing method of high alloy seamless steel tube, comprising the following technical steps: (1) producing a high alloy hollow shell with centrifugal casting technology; (2) heating the hollow shell and plugging the opening of the hollow shell when heating; (3) reaming and wall thinning for the hollow shell after being heated by using a perforating machine so as to form a blank; (4) tube rolling for the bland by using a pipe and tube mill so as to form a pierced billet; (5) sizing and reducing for the pierced billet by using a sizing and reducing machine so as to obtain the high alloy seamless steel tube. The blank with the manufacturing method uses centrifugal casting for the hollow shell and lubricant is added by using the characteristic of hollow shell, thereby avoiding the problems of high alloy material in the technologies of forging, rolling and punching such as low metal yield and high rejection rate due to difficult deformation, thereby greatly reducing the manufacturing cost.

The invention relates to a bismuth telluride-based thermoelectric generating device and a manufacturing method thereof. The bismuth telluride-based thermoelectric generating device is characterized by consisting of a perforated bracing frame, P / N-type elements, a barrier layer, a soldering tin layer, a low-temperature terminal electrode, a ceramic substrate, a sealant, a high-temperature terminalspraying electrode and the ceramic substrate; the pattern of the low-temperature terminal electrode corresponds to holes of the perforated bracing frame. The manufacturing method comprises the steps of preparing the perforated bracing frame, preparing the elements, mounting the elements, soldering the cold terminal electrode with tin, spaying a hot terminal electrode, grinding the sprayed surfaceand the like; the perforated bracing frame is put on the ceramic substrate covered by the low-temperature terminal electrode, the low-temperature terminal electrode is arranged in a hole of the bracing frame, the bismuth telluride-based P / N-type elements are put in the holes of the bracing frame, the soldering tin layers of the elements contact with a tin layer on the low-temperature terminal electrode, the elements are soldered on the low-temperature terminal electrode by heating; the high-temperature terminal of the device is sprayed with aluminum or aluminum alloy and taken as the high-temperature terminal electrode, and the P / N-type elements are connected in series. The device and the method overcome the problem that the existing tin soldering devices are restricted by operating environment and temperature, and the rejection rate and the manufacturing cost are far less than these of plasma spraying devices.

The invention relates to a graphene oxide-based composite membrane for treating radioactive wastewater and a preparation method thereof.According to the membrane, a porous carrier is pre-modified through a silane coupling agent, and the graphene oxide-based composite membrane is prepared from a polydopamine and graphene oxide compound by adopting a vacuum filtration method.The method is characterized in that a polydopamine bionic self-assembly technology and a graphene oxide sheet are compounded, the size dimension of a membrane nanochannel is accurately adjusted, the selectivity or the rejection rate of the membrane on radionuclide ions is increased, and concentration and removal of radionuclide are achieved.According to the graphene oxide-based composite membrane for treating the radioactive wastewater and the preparation method thereof, the preparation process is simple and easy to operate, good repeatability is achieved, the water flux and ion rejection rate of the composite membrane are significantly increased, the separating property of a long-time operating membrane is stable, and a wide application prospect in the fields such as membrane-method radioactive wastewater treatment and heavy metal wastewater treatment is achieved.

A preparation method of a high-performance PVDF composite ultrafiltration membrane with the surface loaded with a TiO2 thin membrane is provided. The invention is used for solving the problems of complex process, high membrane preparing cost, and difficult industrialized production existing in a conventional method for improving membrane hydrophilicity so as to improve membrane flux, anti-fouling performance and the like. The preparation method comprises the steps: 1, preparing a PVDF polymer membrane casting solution, and preparing an ultrafiltration basement membrane by an immersion-precipitation method; 2, preparing an auxiliary agent solution; 3, soaking the basement membrane in the auxiliary agent solution, taking out and swashing with water, and soaking in deionized water; 4, preparing a titania precursor solution; 5, immersing the basement membrane in the titania precursor solution, hydrolyzing a precursor, taking out and swashing with water, and thereby obtaining the high-performance ultrafiltration membrane with the surface firmly loaded with the TiO2 thin membrane. The method of the invention has the advantages of simple operation and low cost; and the obtained ultrafiltration membrane has large permeation flux, high rejection rate, strong hydrophilicity and outstanding anti-fouling performance. The preparation method is used for the membrane processing field.

The present invention discloses a preparation method of hydrophilic PVC alloy ultrafiltration membrane. PVC amphiphilic graft copolymer is synthesized through an atom-transfer-free radical polymerization method, which is taken as a hydrophilic modifier and is blended with PVC to prepare the PVC alloy ultrafiltration membrane with controllable structure, hydrophilicity, pollution resistance, large flux and high rejection rate by a solution transformation method. The hydrophilic chain of the amphiphilic graft copolymer can self-assemble and transfer to the membrane surface for microphase separation in the process of solution phase inversion, thus forming a relatively thin hydrophilic surface layer (dozens to hundreds of nanometers). The membrane preparation and hydrophilic modification are carried out simultaneously and the hydrophilic modification of membrane and the interior of the membrane hole can be achieved. The surface contact angle of the ultrafiltration membrane is less than 60 degrees and can be reduced to 0 degree within dozens of seconds; the water flux reaches above 500L / m<2> h(0.1Mpa); the BSA rejection rate reaches above 90 percent; the recovery rate of water cleaning flux is above 90 percent.

The invention discloses a full-automatic double-end-face grinding production line. The production line is arranged in a straight line and sequentially comprises a feeding mechanism, a feeding mechanical arm, a first double-end-face grinding machine, a first transfer conveying belt, a first washing mechanism, a first detecting device, a transfer mechanical arm, a second double-end-face grinding machine, a second transfer conveying belt, a second washing mechanism, a second detecting device, a discharging mechanical arm and a discharging mechanism, wherein the first double-end-face grinding machine is provided with a first grinding machine material drop plate which is engaged with the feeding mechanical arm; the second-end-face grinding machine is provided with a second grinding machine material drop plate which is engaged with the transfer mechanical arm. The full-automatic double-end-face grinding production line disclosed by the invention can be used for grinding a wide range of materials, is capable of implementing feeding, grinding, washing, detection and discharging of a work piece material by one time, is high in automation degree and has the effects of guaranteeing the machining quality, reducing the rejection rate, also greatly alleviating the labor strength, reducing the labor and lowering the machining cost and the manufacturing cost for enterprises.

The invention relates to the field of preparation of a capacitor, and in particular relates to a preparation method of a metalized film of an induction cooker capacitor. The preparation method comprises the following steps of: selection and preparation of raw materials, extruding a melt through an extruder, cooling the melt through a chilling roller and an air shower, drawing the melt in a vertical direction, drawing the melt in a transverse direction, testing the thickness of the drawn melt, performing procedures of trimming and corona treatment, rolling, time sequence treatment, slicing, and vacuum-evaporating the metalized film. Through the steps, the prepared metalized film is comparatively high in performance, comparatively low in rejection rate, low in cost and high in current carrying capability.

The invention discloses an additive for improving utilization ratio of silicon crystal line cutting mortar as well as a preparation method and application method of the addictive. The additive is composed of the following raw materials in percentage by weight: 50-96.5% of polyethylene glycol, 1-10% of penetrating agent, 1-20% of ether alcohol surfactant, 0.5-10% of extreme pressure resistant chelator and 1-10% of assistant detergent. The preparation method comprises the steps of weighing and mixing the raw materials. The application process comprises the following steps: 1. carrying out the first line cutting the mortar and recovering the mortar; 2. adding the additive: adding the additive to the recovered mortar after the first linear cutting based on the weight ratio of 1:100 plus / minus 10, and then evenly stirring; 3. carrying out the second line cutting; and 4. carrying out the third line cutting and recovering the mortar. The addictive is reasonable in design and has good use effect and practicable value, addictive preparation and use processes are simple, operation is convenient, and the defects of the existing silicon wafer cutting fluid such as more severe pollution, higher rejection rate, high production cost, low utilization ratio and the like can be overcome.

The invention discloses an on-machine detection measuring head for a numerical control machine tool. The on-machine detection measuring head comprises a measuring bar and a guide mechanism for guiding the measuring bar to make the vertical linear motion. The top of the measuring bar is provided with an elastic reset mechanism. The on-machine detection measuring head is characterized in that a linear displacement sensor is arranged at the position close to the measuring bar. The invention also discloses a detection system applying the measuring head, and the detection system comprises the measuring head, a signal acquisition circuit and a control center which are sequentially electrically connected. A numerical control system executes a measuring program to control a servo system of the machine tool to drive the measuring head to carry out measurement; coordinates of a point which is measured each time are timely transmitted back to the detection system; after the model detection is completed, the detection system carries out error compensation on measurement data; a spatial position and shape information of a measured workpiece can be calculated by carrying out corresponding operation on the corrected data; and the positioning and processing correction of the workpiece are guided by utilizing an obtained result. Auxiliary processing time can be greatly saved and the rejection rate of the workpiece is reduced.

The invention discloses a method for controlling non-metallic inclusions in steel, and belongs to the field of steelmaking and refining control. Two-section calcium treatment and soft blow are adopted during the refining, and the calcium treatment and the soft blow are performed at the end of LF refining and RH vacuum treatment respectively, so that the non-metallic inclusions in a casting blank are classified into two types: 70 to 90 percent of non-metallic inclusions with CaS as main components, and 10 to 30 percent of oxide type non-metallic inclusions, wherein all the non-metallic inclusions in the casting blank are spherical; the particle diameters of all the non-metallic inclusions in the casting blank are controlled within a range of 0 to 5 microns; and the number of the non-metallic inclusions with the diameter of greater than 3 microns in the casting blank is controlled within the range of 0 to 5 / cm<2>. Thus, the problem that the calcium aluminate type non-metallic inclusion produced after the calcium treatment cannot be discharged out of molten steel due to insufficient time, so the content of calcium aluminate type non-metallic inclusions in the casting blank is high is solved. The rejection rate caused by super-standard non-metallic inclusion of the low alloy structural steel is reduced.

The invention relates to a combination machining tool for an installation position of a door pocket frame. The combination machining tool comprises a numerical control doorframe fixed-length slot milling machine 1, a workpiece turnover machine 2, a numerical control doorframe drilling machine 3 and a numerical control doorframe hardware slot machining machine 4. The numerical control doorframe fixed-length slot milling machine takes out a pair of workpieces 5 from the bottom of a stock bin 11 of the numerical control doorframe fixed-length slot milling machine every time for conducting fixed-length cutting and decoration plate slot milling, wherein the front faces of the workpieces 5 face each other, and the workpieces 5 are stacked vertically. Then, the pair of workpieces are conveyed to the workpiece turnover machine, the workpiece turnover machine turns over the upper workpiece so as to enable the front faces of the pair of workpieces to face upwards, then the workpieces are fed into the numerical control doorframe drilling machine together, after all holes are machined in the workpieces, the pair of workpieces are fed into the numerical control doorframe hardware slot machining machine for machining doorframe hinge slots and doorframe spring bolt slots in the workpieces at the same time, and after the slot machining is completed, the workpieces are conveyed out in pairs. The machining tool has the advantages of being high in efficiency and product consistency and low in rejection rate.