1910results about How to "Guaranteed dimensional accuracy" patented technology

The invention discloses a selective laser melting rapid forming device for directly manufacturing large-size compact parts, which mainly comprises a laser array, an optical system array, a forming cylinder, a forming cylinder vertical sectional heating thermal-insulation structure, a forming cylinder weight balancing system, a substrate leveling device, a double-recovering cylinder, a double powder storing box, a double quantitative powder sending and discharging device, a powder paving device, a protective atmosphere cover, a gas purifying system and a control system, wherein an adopted optical system is composed of a plurality of optical system units and a mechanical moving platform, and the coverage area of the optical system can be randomly expanded or reduced. The size of the parts manufactured by using the selective laser melting rapid forming device provided by the invention is more than the size of the parts manufactured by using the existing national and foreign selective laser melting processes. The forming efficiency is multiplied while the forming precision, the parts complexity and the mechanical property are not changed.

This invention relates to an electro-plastic rolling method and a device for deformed Mg alloy thin plates, strips and wires including: inducing the deformed Mg alloy plates, strips and wires in single-way instant high energy continuous pulse current directly in the process of rolling, the current passes through a pair of electric contact devices with their distance adjustable to apply on the moving Mg materials, and the roller is the negative in it, necessary cooling and lubrication measures should be taken when rolling, this time, the rolling deformation ability of the Mg material is increased greatly and the resistance is reduced to avoid high temperature oxidation and poor accuracy in size.

The invention discloses a machining process of an axial-flow type turbine blade. The machining process of the axial-flow type turbine blade comprises the following steps that two side faces are machined on a square blank stock through an end face end mill on an ordinary milling machine through two process of rough milling and finish milling, another two side faces are machined with the two machined side faces as base planes, and then the two end faces are machined through the end face end mill; a steam outlet side face is machined on one side face through two process of rough milling and finish milling, the position, close to the steam outlet side face, of the blade root end face is marked as C, a face which forms an acute angle with the steam outlet side face and is adjacent to the steam outlet side face is marked as N and is the inner radial surface, and the other three side faces are machined to be a parallelogram through rough milling and finish milling; central holes are drilled in the blade root end face and the blade crown end face; the blade type is roughly milled through the end face end mill, the blade root is roughly milled, and finally the blade crown is roughly milled; then the blade is installed on a five-axis numerical control machining center for alignment and is machined in a finish mode; a process head at the blade root end face is roughly sawn through a sawing machine; the turbine blade is detected according to the requirements of a drawing.

The invention discloses a multi-station continuous hot stamping production line and method. The production line comprises a material loading table, a feeding robot, a press unit, a material conveying robot, a quenching device, a material unloading robot and a conveyor belt which are arranged in sequence. The press unit comprises a heating device, a mould device and at least one press used for installation of the mould device; the heating device is used for wholly or locally heating a prefabricated blank to obtain a hot blank, and the mould device is used for conducting stamping forming, pressure maintaining setting and trimming and punching on the hot blank to obtain a hot stamped part. The rapid heating, stamping forming, pressure maintaining setting, trimming and punching and quenching can be continuously completed, so that the heating efficiency is improved, and the transportation process before punching of the hot blank is also avoided. For steel plates, stamped parts are blanked at a high temperature, increasing of cutting difficulty caused by generation of a martensitic structure at normal temperature is avoided, the blanking force is reduced, and the optimal blanked edge can be obtained.

The invention relates to a ring forge piece punching and cutting composite type mould which is used on a mechanical press, in particular to the ring forge piece punching and cutting composite type mould. In the conventional mechanical manufacturing industry, inner hole punching and outer edge cutting in a forging and forming process of a forging ring of a transmission chain are performed in two steps, the production efficiency is low and the cost is high. The mould consists of an upper mould, an ejector, a lower mould and a material returning and outer burr removing part, wherein an upper mould plate is provided with a guide sleeve, connecting rods and an edge cutting punch head; a lower mould plate is provided with guide posts, an edge cutting female die seat, an edge cutting female die, a punching punch head seat and a punching punch head; a movable plate is provided with a connecting sleeve, an ejector seat and an ejector head and positioned and guided by two guide posts and the guide sleeve; and four connecting rods drive the connecting sleeve, the movable plate and the ejector part to rise so as to eject a finished punched workpiece. The composite mould is matched with a guide post guide sleeve structure, so accurate positioning of the upper mould, the lower mould and the ejector part is realized, the dimensional accuracy of a product is guaranteed, and the mould is suitable for simultaneous edge cutting and punching of a ring forge piece.

The invention relates to a helical milling device and a helical milling method, and belongs to the technical field of machining. The device mainly comprises a helical feed mechanism (1100) used for realizing the axial feeding and revolution of a cutter (1303), a radial deviation mechanism (1200) used for adjusting the revolution radius of the cutter (1303) relative to axes of pores and a rotation mechanism (1300) used for driving the cutter to rotate. The device and the method of the invention can greatly improve the manufacturing quality and machining efficiency of complex pore series on surfaces of large-scale workpieces.

This invention relates to a method for preparing ireproof shield tunnel segment material with low shrinkage and high impermeability. The material is prepared from: cement 360-400kg / m3, fly ashes 80-120 kg / m3, fine aggregate 690-720kg / m3, coarse aggregate 1100-1180 kg / m3, humidity supplementary medium 50-150 kg / m3, fibers 0.8-2 kg / m3, expanding agent 20-30 kg / m3, water (the water / colloid is 0.29-0.32), and high-performance naphthalene-based water reducer (the amount is 1.3-1.6 wt.%). The material has such advantages as good durability, high size stability, and good fireproof performance.

The invention discloses a manufacturing method of a hub type electroplated ultrathin diamond abrasive cutting wheel. The method comprises the steps that a high-precision aluminum alloy matrix is subjected to chemical plating treatment and placed into an electroplating solution containing diamond abrasive materials, the evenly-suspended diamond abrasive materials are wrapped by a plating layer during reduction of a cathode of anode nickel ions under the effect of a direct current electric field, and a composite plating layer with the needed thickness is formed after uniform codeposition is kept for a certain period of time; and the hub type electroplated ultrathin diamond abrasive cutting wheel with the blade thickness of 0.010-0.150 mm is manufactured through the plating layer surface precise grinding, external circle grinding and blade reverse face microcorrosion treating processes. By the adoption of the phosphorous nickel aminosulfonate electroplating solution, by means of the hardness increasing effect of a hardening agent and the microstress effect of a stress removing agent, a low-stress high-hardness novel nickel-based binding agent is obtained, a blade of a cuter of the hub type electroplated ultrathin diamond abrasive cutting wheel has extremely low stress and high strength, and the problem that the cutter of the abrasive wheel is broken due to stress deformation or too low strength in practical application is avoided.

The invention discloses a method for forming a J-shaped beam structure composite workpiece by open type soft tooling; fiber-reinforced rubber open type soft tooling can be formed by a metal mold, the formed soft tooling can be one part of a formed mold for completing the forming process of the composite produced part. Compared with a traditional core mold forming method, the soft tooling can uniformly and accurately transmits pressure applied by an autoclave, out-of-tolerance of thickness of the composite workpiece can be avoided, the soft tooling is thinner in wall thickness, thermal hysteresis effect can be avoided, the forming quality of the workpiece can be effectively guaranteed by the above two points, and the qualified rate and the efficiency of production can be improved. The soft tooling can be used repeatedly, the reproduction is also more convenient, and the production cost and the manufacturing cycle are effectively reduced, and the production efficiency is improved.

The invention provides a special through-hole drilling fixture for a cylindrical part, and relates to a drilling fixture for a cylindrical part, which is used for solving the problems such as poor size and position precision of the hole and easy rupture of a drill bit caused by no machining plane, difficult drill bit localization and greater vibration when the through hole is drilled on the outer side wall of the cylindrical part. In the invention, a high vertical plate, a low vertical plate and a support vertical plate are fixedly connected on a base, wherein, the support vertical plate is positioned between the high vertical plate and the low vertical plate; a V-shaped groove is machined at the middle part of the upper end surface of the support vertical plate; a screw is in threaded connection with a threaded through hole of the low vertical plate; a first blind hole is machined on the bottom of the V-shaped groove; a pressure plate and the high vertical plate are located by two second locating pins; a locating block is composed of a large-diameter cylinder and a small-diameter cylinder which are integrated together, and the small-diameter cylinder is matched with an inner hole of the part; and a first locating pin is composed of a large-diameter pin and a small-diameter pin which are integrated into a whole, the first locating pin is arranged in the first blind hole of the support vertical plate, and a spring is arranged in a second blind hole of the first locating pin. The special through-hole drilling fixture provided by the invention is used for localization when the through hole is drilled on the cylindrical part.