50results about How to "Reduce forming pressure" patented technology

The invention discloses a combined plastic forming method of an automobile hub and a matching forming mold of the automobile hub. The method comprises the following steps of: 1, forming the automobile hub by using light-alloy blanks through a set of forming mold at two steps under the condition of constant temperature, wherein the forming mold is provided with a split lower mold, two upper extrusion male molds and two upper bulging male molds, and the upper extrusion male molds and the upper bulging male molds are sequentially matched with the split lower mold; 2, matching the blanks in the mold by using the upper extrusion male molds and the upper bulging male molds during forming; 3, pre-forming a spoke part of the hub and the lower part of a rim by adopting an extrusion process; 4, forming the upper part of the rim into a hollow pipe blank; and 5, matching the upper bulging male molds with the lower mold and forming a pre-formed part formed in the step 1 into the hub through the extrusion process. Equipment disclosed by the invention has a simple structure, the deformation resistance of each-step process is lower, the mold size and the equipment tonnage are effectively reduced,the production efficiency is improved, and the production cost is lowered.

The present invention provides an upsetting method capable of unevenly expanding the diameter of a portion to be expanded in the circumferential direction of a blank. A guide body (20) having an insertion hole (21) through which the planned diameter expansion portion (2) of the holding blank (1) is inserted in a vertical bending preventing state is prepared. A protruding piece portion (22) for suppressing diameter expansion that protrudes in the axial direction of the guide body (20) is integrally provided on a part of the front end portion (20a) of the guide body (20). The predetermined diameter expansion portion (2) of the blank (1) fixed in the stationary mold (10) is inserted and held in the insertion hole (21) of the guide body (20). Next, while moving the punch (30) and pressing the portion (2) of the blank (1) to be enlarged by the punch (30) in the axial direction, the guide body (20) is directed toward the punch (30) is moved in the opposite direction of the moving direction, whereby the planned diameter expansion portion (2) of the blank (1) exposed between the front end portion (20a) of the guide body (20) and the fixed mold (10), The diameter expansion is performed in a state where the diameter expansion is suppressed for the contact portion of the planned diameter expansion portion (2) with the protruding piece portion (22).

The invention discloses a preparing method of a G20Cr2Ni4 bearing steel large-scale special-shaped cross section annular blank. The preparing method comprises the steps that a G20Cr2Ni4 alloy bar is heated to be 1180+/-20 DEG C in a certain heating mode, and is then subjected to upsetting, punching and rolling to become a rectangular cross section annular blank; then, the rectangular cross section annular blank is expanded into a primary special-shaped cross section annular blank at the pressure of 24 to 28MN; next, the primary special-shaped cross section annular blank is expanded into a secondary special-shaped cross section annular blank at the pressure of 22 to 26MN; then, the upper end of the secondary special-shaped cross section annular blank higher than a loose tooling is subjected to free upsetting to be flush with the loose tooling at the pressure of 10 to 14MN, and the final special-shaped cross section annular blank is obtained. The method has the advantages that the forming pressure required by the blank manufacturing can be effectively reduced, meanwhile, the flow direction of process excess materials can be effectively controlled, and the forming dimension of an intermediate blank is ensured. The method is applicable to the preparation of the intermediate blank of a large-scale special-shaped cross section annular blank element.

The invention discloses a preparing method of a TC4 alloy large-scale special-shaped cross section annular blank. The preparing method comprises the steps that a GH4169 alloy bar is heated to be 30 DEG C below the phase transformation point in a certain heating mode, and is then subjected to upsetting, punching and rolling to become a rectangular cross section annular blank; then, the rectangular cross section annular blank is expanded into a primary special-shaped cross section annular blank at the pressure of 32 to 34MN; next, the primary special-shaped cross section annular blank is expanded into a secondary special-shaped cross section annular blank at the pressure being 30 to 32 MN; then, the upper end of the secondary special-shaped cross section annular blank higher than a loose tooling is subjected to free upsetting to be flush with the loose tooling at the pressure of 20 to 24MN, and the final special-shaped cross section annular blank is obtained. The method has the advantages that the forming pressure required by the blank manufacturing can be effectively reduced, meanwhile, the flow direction of process excess materials can be effectively controlled, and the forming dimension of an intermediate blank is ensured. The method is applicable to the preparation of the intermediate blank of a large-scale special-shaped cross section annular blank element.

The invention relates to a bipolar plate forming technology, in particular to super-plastic forming device and process of a metal bipolar plate for a proton exchange membrane fuel cell. The device comprises a pressure plate, guide sleeves, springs, guide posts, a pressing rod, an environmental box, an upper template, a lower template, a base, a connection plate, a blank pressing plate, a metal plate and a support rod. The process implemented by the device comprises the following steps: (1) opening the environmental box; (2) fixing a metal sheet of a processed part on the lower template; (3) closing the environmental box, determining the super-plastic forming temperature according to a processed plate and inputting the super-plastic forming temperature into a control system; (4) setting the stroke and the movement rate of the upper template according to the super-plastic strain rate and flow channel shape of the processed plate; (5) starting a circuit system and the environmental box, starting a pressure forming machine to move downwards, and finishing stamping; (6) starting the upper template of a press to reversely return back to the initial position; and (7) opening the environmental box, and cooing and taking out a formed part. According to the super-plastic forming device and process, the material is effectively prevented from rebounding, and the forming accuracy and the dimensional accuracy are ensured.

The invention discloses a method for preparing non-bond fine-particle WC-based cemented carbide. The method includes the following steps that (1) according to the mass fraction, 500 parts of WC mixed powder, 0.15-0.50 part of carbon black and 500-1500 parts of alloy pellets are put into a test machine to be dry-ground for 4-10h, the rotating speed is 30-72r/min, the mixed powder is taken out after halting lasts for 4-6h, and non-bond powder is prepared by means of vacuum drying and sieving; (2) the non-bond powder is sintered through a spark plasma sintering method, the hardness HRA of the prepared product is larger than or equal to 95.4, the density is larger than or equal to 15.30g/cm<3>, the relative density is larger than or equal to 97.4%, and no holes and inclusions are left. Workpieces prepared through the method have excellent performance, holes, inclusions and eta phases are avoided, the HRA is larger than or equal to 95.4, the density is larger than or equal to 15.30g/cm<3> (WC theoretical density is 15.7g/cm<3>), the relative density is larger than or equal to 97.4%, no holes and inclusions exist, the service life is obviously prolonged and the abrasive resistance is obviously improved.

A upsetting method and an upsetting device capable of efficiently increasing the diameter of a bar-like material at at least two positions. In the method, a plurality of guides (31) and (32) having insertion holes (34) are prepared, and the bar-like material (1) fixed to a fixed die (20) is inserted into the insertion holes (34) of the plurality of guides (31) and (32) in order and held therein. Next, while the material (1) is axially pressed by a punch (50R), the plurality of guides (31) and (32) are integrally moved in a direction opposite to the moving direction of the punch (50R) in a mutually fitted state to increase the diameter of the first exposed part (4) of the material (1) exposed between the first guide (31) disposed on the forefront among the plurality of guides (31) and (32) and the fixed die (20). After the first guide (31) is moved, the second guide (32) disposed on the rear side of the first guide (31) among the plurality of guides (31) and (32) is moved in the direction opposite to the moving direction of the punch (50R) to increase the diameter of the second exposed part of the material (1) exposed between the both guides (31) and (32).

The invention aims at the defects in the prior art and mainly provides a connecting rod liquid-state die forging process which is high in production efficiency, material-saving and low in cost. Products produced by means of the process are good in mechanical property. The connecting rod liquid-state die forging process comprises the following steps of (1) designing a die; (2) smelting aluminum alloy; and (3) in the liquid-state die forging process, installing the designed die on a hydraulic machine, debugging the die, spraying a lubricating agent towards a die cavity when the die is heated to be 100-150 DEG C, casting molten aluminum alloy into the die cavity when the die is heated to be 220-280 DEG C, wherein the temperature of the molten aluminum alloy in casting is 710-750 DEG C, the work pressure is maintained to be 16-20 Mpa and the dwell time is 5-10s after the molten aluminum alloy is poured into the die; and (4) performing follow-up treatment, namely taking out a liquid-state die forging piece, quickly placing the liquid-state die forging piece into a sand pile to be cooled, performing quenching and tempering to obtain a connecting rod.

The invention discloses a multi-directional numerical control linkage precision forming process of a transmission planetary carrier. The process is characterized in that a heated metal bar is formed through numerical control linkage of an upper punch, a front punch, a rear punch, a left punch and a right punch in five directions, and a precise forging of the transmission planetary carrier with thecomplicated shape is prepared in a single station and through one-time heating and multi-directional forming; and the front punch, the rear punch, the left punch and the right punch in a die are arranged in four side square holes in a female die, and are not separated all the time in the forming process. The forging forming planet carrier forge piece is small in machining allowance, the production efficiency is greatly improved, the cost can be reduced to a great extent, and a certain foundation can be laid for mass production of the current part.

The invention relates to a method for preparing biomass briquette by utilizing a high-calcium fly ash composite binder. The method comprises the following steps of: with crushed biomass, high-calcium fly ash and saw dust as raw materials, uniformly mixing crushed biomass grains and a composite binder at 85-95 DEG C, feeding a mixture to a forming machine to form biomass briquette grains, and cooling down the biomass briquette grains, wherein the high-calcium fly ash and the saw dust form the composite binder; in the all raw materials, the addition amount of the composite binder to total weight of the all raw materials is 13-20%, the weight ratio of the high-calcium fly ash to the binder is 8-20% and the balance of the raw materials is the saw dust. The method disclosed by the invention has the advantages of good environment protection performance, high economic value, low costs of devices and persons and excellent technical effect.

The invention discloses an electric pulse assisting hot extrusion forming device and forming method. According to the electric pulse assisting hot extrusion forming device, temperature, pressure and pulse currents are adopted for acting on a metal blank together, and extrusion plastic deformation happens to the metal blank. Compared with an existing hot extrusion forming device, the electric pulseassisting hot extrusion forming device can reduce forming pressure, reduce wear of an extrusion mold and reduce the requirement for equipment tonnages. Grains of an extrusion profile are refined, second-phase precipitates are finer and are distributed dispersedly, and the mechanical performance and surface smoothness of the extrusion profile are improved. According to the electric pulse assisting hot extrusion forming method, proper temperature parameters, extrusion speed parameters and electric pulse parameters are selected, and therefore the forming pressure can be obviously reduced, the grains can be refined, and the product quality can be improved.

The invention discloses a preparing method of a G10CrNi3Mo bearing steel large-scale special-shaped cross section annular blank. The preparing method comprises the steps that a G10CrNi3Mo alloy bar is heated to be 1210+/-20 DEG C in a certain heating mode, and is then subjected to upsetting, punching and rolling to become a rectangular cross section annular blank; then, the rectangular cross section annular blank is expanded into a primary special-shaped cross section annular blank at the pressure of 23 to 26MN; next, the primary special-shaped cross section annular blank is expanded into a secondary special-shaped cross section annular blank at the pressure of 20 to 25MN; then, the upper end of the secondary special-shaped cross section annular blank higher than a loose tooling is subjected to free upsetting to be flush with the loose tooling at the pressure of 8 to 12MN, and the final special-shaped cross section annular blank is obtained. The method has the advantages that the forming pressure required by the blank manufacturing can be effectively reduced, meanwhile, the flow direction of process excess materials can be effectively controlled, and the forming dimension of an intermediate blank is ensured. The method is applicable to the preparation of the intermediate blank of a large-scale special-shaped cross section annular blank element.

The invention provides a cross wedge rolling type strain-induced semi-solid die forging process for a high-pressure common rail pipe for an internal combustion engine. An alloy bar made of a 0Cr18Ni9 stainless steel material and used for forming the high-pressure common rail pipe is preheated and then subjected to cross edge rolling, and a cross wedge rolling distorted state blank is obtained; then the cross wedge rolling distorted state blank is subjected to secondary heating, and then a high-pressure common rail pipe semi-solid blank with certain solid phase components is obtained; and finally the high-pressure common rail pipe semi-solid blank is subjected to semi-solid die forming, and then a high-pressure common rail pipe formed part is obtained. The low forming pressure is obtained, the product quality is good, and the material utilization rate is high.

The invention relates to a method to produce V2O3 and Cr3+ or Al3+ mixed globular shape or torispherical nanometer particle positive temperature coefficient temperature sensing series ceramics. The method can gain V2O3 mixed nanometer powder by chemical doping method. After pressing into piece, first gaining particle of ceramics that has an average particle diameter less than 100nm in the H2 gas, low sintering temperature and short sintering span. This series ceramics has high mechanical strength, stable electrical property and small range of critical temperature. The invention discloses simple structure, low energy consumption, low cost and no pollution.