505results about How to "Easy to adjust size" patented technology

A multi-axial spinal cross-connector is configured for connection between spinal fixation devices such as spinal fixation rods. The cross-connector has first and second connection members that are joinable at a fixable pivot junction. The pivot junction allows the connection members to assume various positions relative to one another. A clamp is provided on each end of the first and second connection members whose open and closed states are controlled by fixation of a pivot structure which also fixates the positions of the first and second connection members relative to each other. The cross-connector provides single and / or multi-step locking of both end clamps at the pivot joint. The cross-connector also provides easy in situ sizing, positioning and adjustability.

A drawer organizer for partitioning the interior space of a drawer having at least two opposed walls includes a male member, a female member, and a biasing member. The male member has a base including at least one substantially flat end wall and a body extending from the base. The female member has a base including at least one substantially flat end wall and a body extending from the base and defining a housing having an open end. The biasing member is supported within the housing. The male member is received through the open end and operatively retained relative to the housing. The biasing member generates a biasing force acting between the male and female members to bias the male and female members in opposite directions relative to one another such that the end walls are braced against two opposed side walls of the drawer.

Disclosed is an LED display unit screen. The LED display unit screen is of a modular structure, easy to install, low in cost and strong in interference resistance. The LED display unit screen comprises a plurality of LED display modules and DC power supply, and the LED display modules are clamped on a base frame by a rotary knob lock head; an electric appliance box provided with a base and internally installed with the DC power supply is disposed on the base frame and the LED display module is clamped between the base and a left beam or a right beam; an interface board is arranged in the electric appliance box, and the interface board is provided with a multilayer PCB board with functions of high frequency signal shielding and electromagnetic radiation reduction. A signal receiving module and the DC power supply are communicated with the interface board and the LED display module in a busbar and a gill bar mode. All electric signals and power supply current are transmitted through an internal layer of the interface board, and therefore the usage amount of the open wire cable is significantly reduced. The upper external layer and the lower external layer of the interface board are grounding copper foil, so that high frequency signals can be shielded by the interface board in the internal layer of the interface board and the electromagnetic pollution for the environment by the high frequency signals and the signal disturbance by the high frequency signals for the LED display module are avoided.

A multi-axial spinal cross-connector is configured for connection between spinal fixation devices such as spinal fixation rods. The cross-connector has first and second connection members that are joinable at a fixable pivot junction. The pivot junction allows the connection members to assume various positions relative to one another. A clamp is provided on each end of the first and second connection members whose open and closed states are controlled by fixation of a pivot structure which also fixates the positions of the first and second connection members relative to each other. The cross-connector provides single and / or multi-step locking of both end clamps at the pivot joint. The cross-connector also provides easy in situ sizing, positioning and adjustability.

The invention discloses a dual-band antenna. The dual-band antenna comprises an antenna feed point, a feeder line, an antenna radiation unit and a metal ground, wherein the antenna feed point is of the position where the antenna is connected with a radio frequency circuit; the feeder liner is connected with the antenna radiation unit and the antenna feed point and is used for impedance matching; the antenna radiation unit is used for receiving and radiating electromagnetic waves; the antenna radiation unit comprises a first radiation unit and a second radiation unit which have different resonance frequencies; and the metal ground is a reference ground for the antenna. The bandwidth of the dual-band antenna disclosed by the invention can completely meet the requirements of a dual-band WLAN (wireless local area network) antenna; and in addition, the dual-band antenna has the advantages of low cost, easiness in adjustment of the size, small height and the like.

The invention provides a preparation method of a graphene oxide solution for wet spinning; the preparation method includes the following steps: carrying out centrifugal concentration on a graphene oxide solution, to obtain the graphene oxide solution for wet spinning. The graphene oxide solution is subjected to centrifugal concentration so as to obtain the graphene oxide solution for wet spinning finally. The preparation method of the graphene oxide solution for wet spinning simplifies operation processes, and omits ultrasound, dialysis and pre-expansion processes and the like; the experimental preparation process is simple, the conditions are easy to control, and large-scale production can be realized. In addition, the graphene oxide solution used for wet spinning and prepared by the preparation method provided by the invention has the advantages of stable quality, good water solubility, controllable concentration, and easy adjustment of the size of obtained graphene fiber.

The invention discloses an ore screening device with the damping and the noise reduction functions. The ore screening device comprises a vertical plate, a screening box body, a crushing roller set, afirst screen, a second screen, a third screen, a fourth screen, a cross plate and an L-shaped connecting rod. A box cover is connected to the top of the screening box body, the top of the box cover isconnected with a feeding hopper, the bottom of the feeding hopper is provided with the crushing roller set; the crushing roller set comprises a crushing roller I, a roller shaft I, crushing tooths, acrushing roller II, a roller shaft II and a motor III; According to the ore screening device, the structure is stable, the operation is convenient, through the arrangement of the multi-layer screens,ore grading and screening can be facilitated, the vibration can be reduced under the damping of the rubber bottom, under the driving of a spring and the L-shaped connecting rod, the left and right movement of the screening box body is screened, the ore screening efficiency is improved, a vibration motor is not required to be installed, the vibration effect is better, the noise of the vibration motor is reduced, and the screens are composed of an upper sieve plate and a lower sieve plate and carrying out the interlace; so that the size of sieve pores which coincide with upper sieve pores and lower sieve pores can be adjusted, so that the mesh size of the sieve can be conveniently adjusted.

The present invention discloses a kind of installation for adjusting the position of the ground pegs, comprising cylinder body, top plates and expansion and contraction elements. The top plate and the expansion and contraction elements are installed in the cylinder body: and the expansion elements are equipped in the hollow body formed by the expansion elements; the expansion and contraction elements can adopt the movable adjustable steel plates situated between the end of the cylinder body and the top plate. The movable and adjustable steel plates are in cylindrical shape, which can be formed with cylindrical steel plates with different diameters. The cylindrical steel plates are put together serially according to their diameters. The present invention reduces the impact on the variation cost by the subsidence of the composite peg base; after the cylindrical steel plate is used by the expansions and contraction elements, the pressure and deformation of the invention appear in the form of misalignment. After the adjustment of the position accordingly, the load bearing capacity trends to be infinitely great, convenient to adjust the extent of mobility on top of the peg base of the buildings. Ordinary construction materials are used and the structure is simple.

The invention discloses a porous polyaryletherketone (PAEK) material with bioactivity, and a preparation method and an application thereof, and belongs to the field of biomedical materials. The method comprises the following steps: carrying out wet uniform mixing on PAEK powder and a calcium phosphate ceramic (CPC) spherical particle pore forming agent to obtain a mixture, filling a die with the mixture, applying a pressure to make the hard pore forming agent be arranged in a close packing approximating manner and remove superfluous PAEK powder, heating the die to realize fusion molding of the PAEK powder under hot pressing in order to obtain a PAEK / CPC body, and immersing the PAEK / CPC body in diluted hydrochloric acid to remove the pore forming agent CPC in order to obtain the porous PAEK material; and processing through concentrated sulfuric acid, and immersing in a simulated body fluid to obtain the bioactive porous PAEK material with a surface bone like apatite layer. The method has the advantages of simple process and good repeatability, and the obtained bioactive material has completely three dimensional through macro-pores and abundant surface micro-pores, and easily adjustable macro-porous dimension and amount of porosity, and can be used to prepare bioactive materials with a gradient pore structure. The bioactive porous PAEK material can be used to restore bone defects, and is especially suitable for being used in interbody fusion cages for spinal column restoration.

The invention relates to a three-way low-frequency variable-rigidity variable-damping tuned mass damper. The tuned mass damper comprises a shell, a mass block and an air spring, wherein the mass block is hollow inside to form an air chamber; one end of the air spring is fixedly connected with the outer surface of the mass block; the other end is in sliding connection with the inner surface of the shell. Compared to the prior art, the low-frequency variable-rigidity variable-damping tuned mass damper has the advantages of good stability, convenience in mounting and maintenance, good sealing performance, low vibration isolation frequency, space saving and the like.

The invention discloses Prussian blue and Prussian blue analogue nanosheet film materials and an in-situ preparation method thereof. A substrate is modified with two high-molecular polymers with opposite charges, namely PAH (poly allylamine hydrochloride) and PSS (sodium polystyrene sulfonate), and Prussian blue or Prussian blue analogue square nanosheets are synthesized in situ on the modified substrate with metal ionic salt and potassium ferrocyanide as raw materials. A test of a prepared nanosheet film through ultraviolet-visible spectroscopy, a scanning electron microscope and a transmission electron microscope proves that the nanosheets have controllable size and are uniformly dispersed. The growth direction of the nanosheets is limited by the porous network of the high-molecular polymers, so that the nanosheets are square or rectangular, water is used as a solvent in the whole preparation process of the film and is harmless to the environment, the preparation process is simple and feasible, the cost is low, equipment is simple, the film materials with different kinds of functionality are obtained by changing the variety of simple ions, and the in-situ preparation method has important application value in the field of material preparation.

The invention discloses a large-scale server cabinet high in thermal diffusivity and space utilization rate. The large-scale server cabinet comprises separator plates, telescopic plates and sleeve plates arranged on a cabinet body. The server cabinet body is in the form of a rectangular box body; the number of the separator plates is two; the middle positions of the upper and lower ends of the separator plates are both fixedly provided with sliding blocks which are in the shape of T; the sliding blocks are arranged in slide chutes; the both side surfaces of the server cabinet body are provided with heat radiating holes; the separator plates inside the server cabinet body are provided with air vents; and fan blades are arranged in the air vents. The inside of the server cabinet body is well ventilated and has good heat dissipation. Heat accumulation inside the server cabinet is not easy, so that the phenomenon that the running speed of a server decreases due to overheating will not occur. The service life of the server is relatively long, and that the phenomena of heat dissipation performance degradation and decrease in the running speed of the server will not occur. The server cabinet is convenient to clean. The server is little influenced by the external factors. The server cabinet is suitable for popularization.

The invention relates to a ZnO nanosphere-based GaN-based light emitting diode surface roughening method, which can improve light extraction efficiency. The method comprises the following steps: growing an N-type GaN material, a quantum well and a P-type GaN material on a substrate; depositing a layer of P-type transparent electrode used for ohmic contact on the P-type material; preparing a layer of ZnO nanosphere on the transparent electrode by a sol-gel method; corroding the ZnO and the P-type transparent electrode to expose corroded areas and corroding the ZnO and the P-type transparent electrode to the N-type GaN material; and preparing P and N press welding points. The method has the advantages of the capacity of effectively improving the light extraction efficiency of a light emitting diode, simple preparation method, easily-controlled process procedure, suitability for mass production and no special requirement on growth equipment and process conditions.

The process of pelletizing, recovering and separating heavy oil, asphalt, asphalt dreg and coal dreg includes dispersing material in solvent, introducing into water for fast dispersing and palletizing to prepare granular asphalt slurry, gasifying and condensing solvent for separating from asphalt slurry, and settling to separate out solvent and water for reuse. The process has wide material selecting range, and the prepared asphalt slurry has adjustable particle size, low viscosity and easy pipeline conveyance, and may be applied for preparing synthetic gas and hydrogen and as fuel of power generating system. The present invention has wide application in deep processing of heavy oil, modifying petroleum and recovering tail oil from coal liquefying slag.

The invention discloses a production method of high magnetic induction oriented silicon steel, comprising the following steps: a) carrying out steel-making and continuous casting to produce slabs, wherein the slabs comprise 0.05-0.10 wt% of C, 2.5-4.0 wt% of Si, 0.008-0.028 wt% of S, 0.008-0.040 wt% of Als, 0.004-0.012 wt% of N, 0.08-0.20 wt% of Mn, 0.08-0.30 wt% of Cu, and the balance of Fe; b) preserving heat at no higher than 1250 DEG C and then carrying out hot rolling, wherein the finishing temperature is higher than 850 DEG C; c) carrying out annealing, pickling, once cold rolling or twice cold rolling containing intermediate annealing to get finished product thickness; d) decarburizing annealing, and preserving heat in wet nitrogen-hydrogen protective atmosphere; e) coating an annealing isolation agent and then carrying out high temperature annealing; f) carrying out nitriding treatment; and g) coating an insulating coating, and carrying out stretching, flattening and annealing. According to the invention, the types and distribution of the inhibitor is adjusted, the stable and high inhibition capability is guaranteed, by cooperating with hot rolling and twice recrystallization, the high magnetic induction oriented silicon steel with stable properties is obtained.

The present invention relates to a preparation method of dimension-controllable CsPbX3 perovskite nanometer crystals, and belongs to the technical field of preparation of a semiconductor nanomaterial.The method comprises: firstly, adding a cesium carboxylate solution to a lead bromide solution in N2 protection for a reaction, thereby obtaining CsPbBr3 perovskite nanometer crystal seeds; then, dispersing CsPbBr3 perovskite nanometer crystal seeds in hexane, injecting the obtained product to octadecene at different temperature to obtain CsPbBr3 perovskite nanometer crystals with different sizes; and finally, dispersing CsPbBr3 perovskite nanometer crystals in hexane, and gradually adding a lead chloride solution or a lead iodide solution drop by drop for a reaction to obtain other CsPbX3 (X=Cl, Ir) perovskite nanometer crystals. The method is simple to operate, the size of products is easy to adjust, and the components are controllable.

The invention discloses a cable-stayed bridge cable detection robot system which comprises a machine frame. Multiple power climbing mechanisms are arranged on the machine frame and are distributed in the peripheral direction, each power climbing mechanism comprises a power mechanism and two climbing mechanism bodies, the two climbing mechanism bodies are vertically arranged and are connected through a synchronous drive mechanism, each climbing mechanism body comprises rolling wheels capable of rolling on cables, the rolling wheels of one climbing mechanism body are driven to rotate by the corresponding power mechanism, and the synchronous drive mechanism can drive all rolling wheels of the two vertically-arranged climbing mechanism bodies to synchronously rotate. The machine frame comprises multiple sub supporting frames, each power climbing mechanism is installed on the corresponding sub supporting frame, every two adjacent sub supporting frames are connected through a connecting device, and the distance between every two adjacent sub supporting frames can be adjusted through the corresponding connecting device. The cable-stayed bridge cable detection robot system has very high adapbility and can work on the cables different in diameter, the sub supporting frames are connected by using the connecting devices, and overall size adjustment of the robot system is facilitated.

The invention belongs to the technical field of grinding wheel preparation and particularly relates to a method for preparing a grinding wheel according to a wet method. The method comprises the following steps: respectively adding powder glue, water, starch, binder, foaming agent and curing agent in proportion at different time, and then controlling the stirring speed, temperature and pouring speed in different preparing steps. The method provided by the invention has the advantages of simple technology and production equipment; the prepared grinding wheel is uniform in pore size and distribution; the mechanical strength, the abrasive resistance and the grinding property of the grinding wheel are greatly increased; and especially, the maximum porosity can reach 75%.

The invention relates to the technical field of biological composite materials, and discloses a preparation method of a novel neural restoration tissue engineering scaffold. The preparation method comprises the following steps: modifying bacterial cellulose; preparing a living cell derived material; uniformly mixing the modified bacterial cellulose with the living cell derived material to obtain a mixture, injecting the mixture into a mold, and preparing the neural restoration tissue engineering scaffold by an ice crystals directional solidification method and a freeze vacuum drying method. The preparation method has the benefits that due to dual bionic design of a structure and a component, the living cell derived material, modified nano fibers and a conductive nano material are combined, so that the obtained scaffold is high in moisture content, good in comprehensive mechanical property and high in stability, and has bioactivity and electroactivity; meanwhile, growth and increment of blood cells can be promoted favorably, and a function of axonal regeneration can be guided; the preparation method is simple, and the shape and the size of a prepared product are easy to control; various requirements of the neural restoration tissue engineering scaffold can be met, and the application prospect is wide.

The invention provides an electromagnetic tuned mass damper and a design method thereof, and belongs to the field of energy dissipation and vibration attenuation in civil engineering. A mass block is arranged above an I-shaped support and is connected with the I-shaped support through a plurality of springs, a negative pole and a positive pole of a permanent magnet are respectively fixed on the outer sides of two flanges of the I-shaped support, two racks are respectively and fixedly connected with the two sides of the mass block, each rack is meshed with an inner wheel of a dual-layer horizontal gear on the side of the rack, a plurality of single-layer gears are mutually connected in series and are meshed with outer wheels of the dual-layer horizontal gear, the dual-layer horizontal gear and the single-layer gears are connected to a web area of the I-shaped support through bearings, and a coil is fixedly connected with the single-layer gears, located between the two magnetic poles of the permanent magnet and connected with an energy acquisition circuit. The vibration of the mass block is converted into the rotation of a rotor in an electromagnetic element through a transmission device, the electromagnetic damping provided by the electromagnetic element replaces a viscous liquid damper in the existing tuned mass damper, and the defects of short service life and insufficient stability of the existing tuned mass damper are overcome.

The invention discloses a convenient-to-adjust constant-temperature and constant-humidity power distribution cabinet. The power distribution cabinet comprises a base, a cabinet body, a top cover and an adjusting mechanism, wherein the adjusting mechanism is arranged in the base, the cabinet body is arranged on the adjusting mechanism, the top cover is arranged on the cabinet body, the adjusting mechanism comprises a fixing base, a sliding rail, a sliding plate, a supporting plate, a wedge block, a first servo motor, a first lead screw, a driven wheel, a guide rod, a first sliding block, a driving wheel, a first gear, a second sliding block, a first rack and a second servo motor. The power distribution cabinet is advantaged in that through the adjusting mechanism, the height of the cabinetbody is conveniently adjusted, moreover, the cabinet body can be driven to move in the horizontal direction, and adjustment and use are convenient; through a sensor, a controller and the rack jackingtop cover, the cabinet body is not a closed space, air flow is accelerated, and heat dissipation and dehumidification are carried out.

The invention discloses a trithiocarbonate compound containing ethylene, which is the compound with a structure in the formula I or II, and the ethylene is positioned between the hydrophilic chain segment and the hydrophobic chain segment of the compound. The invention further discloses a preparation method of the trithiocarbonate compound containing the ethylene, under the action of a radical initiator, the compound with the structure in the formula III or VI is firstly reacted with a water-soluble monomer with a chain link A or a chain link C, and is secondarily reacted with a monomer containing a diene double linkage, so the compound with the structure in the formula I or II is obtained; and the preparation method has the characteristics of simple preparation, strong operability, good reproducibility and the like. The invention also discloses the application of the trithiocarbonate compound containing the ethylene in preparing polymer microspheres, so the ethylene is gathered at the surfaces of the polymer microspheres.

The invention discloses a preparation method of Cs4PbBr6 perovskite nanocrystals with size and shape controllable, and belongs to the technical field of semiconductor nanomaterial preparation. The method comprises the steps that a caesium carboxylate solution is added into a lead bromide solution protected by N2, reaction is conducted under room temperature to synthesize CsPbBr3 nano clusters, andthermal injection is conducted on the CsPbBr3 nano clusters into the caesium carboxylate solution to obtain the Cs4PbBr6 perovskite nanocrystals. The preparation method has the advantages of simple operation, easy adjustment of the size of products, control of the shape of the products and the like.

The invention discloses a method for preparing a bioluminescent nano thermometer. The prepared bioluminescent nano thermometer is characterized in that: on the one hand, the fluorescence intensity is controlled through temperature by using a fluorescence quenching effect; at a low temperature, because the thermo-sensitive polymer is in a stretching state, the distance between fluorescent active molecules and metal silver nano spheres is prolonged, the fluorescence quenching effect is weak, and fluorescent signals are strong; when the temperature is raised, the thermo-sensitive polymer is shrunk, so that the distance between the fluorescent active molecules and the metal silver nano spheres is shortened, the fluorescence quenching effect is enhanced, and the fluorescent signals are weakened; and on the other hand, the maximum fluorescence intensity of the bioluminescent nano thermometer is linearly changed together with the environmental temperature, the fluorescence intensity is sensitive together with temperature change, and the maximum fluorescence intensity and the fluorescence intensity can be quantitatively and correspondingly valued, so that the prepared bioluminescent nano thermometer can be used as a nano thermometer.

The invention relates to a special-shaped hole processing method based on spatially shaped femtosecond laser layered scanning, and belongs to the technical field of femtosecond laser applications. According to the processing system, a space shaping technology is adopted to shape traditional femtosecond laser with Gaussian distribution in a space into a flat-top light beam with uniform energy distribution after focusing, a laser scanning path and parameters are set, and high-quality complex special-shaped hole processing is realized. When the spatially shaped femtosecond laser is applied to scanning of a special-shaped hole, energy distribution of the shaped flat-top light beam is relatively average, so that non-ideal processing results caused by uneven ablation can be effectively avoided.When the spatially shaped femtosecond laser is applied to scanning of the special-shaped hole, the shape, the size, the depth and the taper of the special-shaped hole can be conveniently adjusted through the layered design of the scanning path, and special-shaped hole processing with a high freedom degree is realized.

The invention relates to an adjustable numerically-controlled plate-type rebar machine. The adjustable numerically-controlled plate-type rebar machine comprises a machine frame and further comprises a guiding mechanism, a preset mechanism, a drawing device, a straightening mechanism, a drawing mechanism, a length measuring device, an adjustable two-machine-head shearing and bending machine and a stripping mechanism which are sequentially arranged on the machine frame. The guiding mechanism guides rebars, the preset mechanism presets the rebars, the drawing device draws the rebars, and the straightening mechanism conducts high-precision straightening through two reversely-arranged centrifugal straightening barrels; and the drawing mechanism continues to conduct drawing, the length measuring device measures the required length of the rebars, the adjustable two-machine-head shearing and bending machine conducts movable shearing and bending, and the stripping mechanism limits the rebars, so that the rebars cannot be rotated. According to the adjustable numerically-controlled plate-type rebar machine, the continuity of the rebar machining process is achieved, and bending deformation caused by the shearing resistance in the machining process is avoided; a straightener, a shearer and a bending machine are integrally combined; and operation is easy, and the machining efficiency is high.

The invention discloses an ethylenically double bond-containing trithiocarbonate compound with a structure of formula I or formula II, with the ethylenically double bond modified by a hydrophilic segment and an oleophylic segment. The invention also discloses a preparation method of the ethylenically double bond-containing trithiocarbonate compound. The method consists of: under the action of a catalyst, reacting a compound with a structure of formula III or formula V with methoxy polyethylene glycol, then, under the effect of a free radical initiator, reacting the obtained reaction product with a diethylenically double bond-containing monomer, thus obtaining a compound with a structure of formula I or formula II. The preparation method is characterized by simplicity, strong operability, and good repeatability, etc. The invention also discloses application of an ethylenically double bond-containing trithiocarbonate compound in preparing polymer microspheres, so that ethylenically double bonds can be enriched on the surface of a polymer microsphere, while a polymer chain within the microphere can still be a linear structure.

The invention belongs to the field of powder feeding type laser 3D printing and particularly relates to a powder feeding type laser 3D printing optical fiber powder feeding head. The powder feeding type laser 3D printing optical fiber powder feeding head comprises a window protecting system, a telescopic sleeve, a centering device, a protecting gas conveying segment, a connecting sleeve and a powder spraying nozzle which are sequentially and coaxially connected; the connecting sleeve is provided with a dual-layer cooling structure; a laser beam sequentially penetrates center holes of the window protecting system, the telescopic sleeve, the centering device, the protecting gas conveying segment and the connecting sleeve, and is projected onto a machining face; and the powder spraying nozzle sprays powder flow into the light beam from the periphery, and powder is fast fused so that forming machining can be achieved. The powder feeding type laser 3D printing optical fiber powder feeding head has the beneficial effects of being high in powder feeding precision, capable of bearing high power long time work, resistant to oxidization and the like.

The invention discloses a tea oil filtering device and relates to the technical field of filtering equipment. The tea oil filtering device comprises a filtering barrel; the filtering barrel comprises an oil feeding pipe, an oil discharging pipe, a first filtering hopper and a second filtering hopper; the first filtering hopper has a conical structure with an opening at bottom; the first filtering hopper and the second filtering hopper both have netted structures; an oil residue box is moveably arranged at the bottom of the second filtering hopper. Three-layer filtering operation is arranged for the tea oil filtering device, so that tea oil is fully purified and filtered; with a backflow mechanism, the filtering efficiency is high; the practicability and the flexibility are high.

The present invention relates to a method and a device for manufacturing a blank for a round tool and to a blank for a round tool, and eventually to a method for manufacturing a round tool and to a round tool obtained. The device comprises a die for extrusion and a sleeve arrangement comprising a sleeve, and an end member for closing the sleeve in one end. Extrusion through the die continuously forms an extruded material comprising chip flutes and optionally internal coolant channels, which is received by the sleeve arrangement. The extruded material received by the sleeve arrangement is reworked and shaped to a shank portion after the interior shape of the sleeve arrangement. A projection of the end member protruding into the sleeve forms a bore in the blank. When the shank portion is finished the end member is released and moved forward as extrusion continues to form a fluted portion to complete the blank. The material waste is minimal in this process and since the internal coolant channels are formed simultaneously with the chip flutes in the fluted portion there is no risk of deforming the internal coolant channels. Moreover, a bore in the round tool removes unnecessary material and provides improved design of internal coolant channels.