Hard alloy powder cold pressing machining device

Abstract

The invention relates to the technical field of powder metallurgy, in particular to a hard alloy powder cold pressing machining device. Comprising a base, guide columns and a supporting table, the top of the base is connected with the supporting table through the guide columns, a hydraulic cylinder is arranged on the supporting table, a piston rod of the hydraulic cylinder is connected with an upper mold, the top of the base is connected with a lower mold, an electric cylinder is installed on the base, a piston rod of the electric cylinder is connected with a forming platform, and a forming pipe is connected to the forming platform in an embedded mode. The forming pipe sleeves the outer side of the lower mold; and the outer diameters of the upper mold and the lower mold are matched with the inner diameter of the forming pipe. Demolding is carried out in the mode that the forming platform and the forming pipe move downwards synchronously, a workpiece is pushed into the forming platform from the lower mold in a horizontal push-out mode after demolding, a traditional local ejection structure is replaced, the defects of indentation, sunken parts, micro cracks or edge breakage and the like caused by small action area and stress concentration of an ejection column are overcome, and the product quality is improved. And the surface integrity and the structural reliability of the workpiece are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy technology, and more specifically to a cold pressing apparatus for cemented carbide powder. Background Technology

[0002] Due to its high hardness, high wear resistance, and excellent high-temperature performance, cemented carbide is widely used in cutting tools, molds, mining machinery, and aerospace. In the preparation of cemented carbide products, powder cold pressing is a key initial process, and its forming quality directly affects the density, dimensional accuracy, and mechanical properties of the subsequently sintered products.

[0003] Patent CN116809931B discloses a powder cold pressing device and method for cemented carbide processing. This patent uses a vibrating impactor to periodically strike a movable seat, causing the movable seat to drive an impact plate that vibrates the lower mold in the vertical direction, thereby separating the formed part from the inner wall of the lower mold cavity. However, its vibration effect mainly relies on mechanical impact, and when processing high-density, high-adhesion cemented carbide powder compacts, it is still difficult to completely avoid adhesion between the workpiece and the mold. Furthermore, the ejection unit used in this device pushes the formed part out through localized force applied by the ejection column, resulting in a small effective area. High stress is easily generated in the contact area at the moment of ejection, which can easily lead to indentations or cracks on the workpiece surface, or even defects such as structural chipping. Moreover, the device lacks an effective automatic release agent application mechanism, making it impossible to uniformly lubricate the mold or cavity inner wall before pressing, further exacerbating the difficulty of demolding and the risk of workpiece surface damage, making it difficult to meet the continuous production requirements of high-precision, high-quality cemented carbide products. Summary of the Invention

[0004] In order to overcome the shortcomings of existing powder cold pressing devices, such as incomplete demolding due to reliance on mechanical impact and vibration during demolding, easy indentation or cracking of workpiece surface due to local stress concentration during ejection, and lack of automatic and uniform application of release agent, this invention provides a cemented carbide powder cold pressing processing device.

[0005] The technical solution is as follows: A cemented carbide powder cold pressing processing device includes a base, a guide column, and a support platform. The support platform is connected to the top of the base via the guide column. A hydraulic cylinder is installed on the support platform. An upper mold is connected to the piston rod of the hydraulic cylinder. A lower mold is connected to the top of the base. An electric cylinder is installed on the base. A forming platform is connected to the piston rod of the electric cylinder. A forming tube is embedded in the forming platform. The forming tube is sleeved on the outside of the lower mold. The outer diameters of the upper and lower molds are matched with the inner diameter of the forming tube. A powder feeding box is connected to the top of the forming platform via a guide mechanism. The guide mechanism is used to drive the powder feeding box to move horizontally. A mold coating mechanism is installed on the powder feeding box for applying a release agent to the ends of the upper and lower molds before powder feeding. A tube wall coating mechanism is connected to the bottom of the forming platform for applying a release agent to the tube wall before forming.

[0006] Furthermore, the guiding mechanism includes a guide rod, a guide sleeve, a long rack, and an electric gear. A guide rod extending horizontally is fixedly connected to the top of the forming platform. A guide sleeve is slidably fitted on the guide rod. The guide sleeve is fixed to the top of the powder filling box, allowing the powder filling box to slide horizontally along the guide rod. An electric gear is installed on the outside of the powder filling box. A long rack meshing with the electric gear is provided on the top of the forming platform.

[0007] Furthermore, the mold coating mechanism includes a guide frame, guide plates, wiping cotton strips, an air bladder, an air inlet pipe, a Y-shaped liquid inlet pipe, and a return spring. The guide frame is embedded in one side of the powder filling box, and guide plates are slidably installed on its upper and lower sides respectively. A partition plate is provided in the middle of the guide frame, and a return spring is connected between the guide plates and the partition plate. Each of the two guide plates has a receiving cavity on its outer side, and a wiping cotton strip is detachably installed in the receiving cavity. An air bladder is provided between the two guide plates, and the air bladder is connected to the partition plate. An air inlet pipe is connected to the air bladder, and the two branches of the Y-shaped liquid inlet pipe are respectively connected to the receiving cavities of the upper and lower guide plates.

[0008] Furthermore, scraper strips are connected to the outer side of both guide plates.

[0009] Furthermore, the tube wall coating mechanism includes a sealing shell, a feeding pipe, a spray pump, a hose, an annular pipe, and an annular sponge. The bottom of the forming platform is connected to the sealing shell, the feeding pipe is connected to the sealing shell, and the spray pump is installed inside the sealing shell. Multiple vertically arranged flow channels are evenly spaced around the lower mold. An annular groove communicating with the upper end of the flow channel is opened on the outer side of the upper part of the lower mold. An annular sponge is installed in the annular groove and contacts the inner wall of the forming tube. The lower ends of each flow channel are connected by an annular pipe, and the annular pipe is connected to the outlet of the spray pump through a hose.

[0010] Furthermore, the cemented carbide powder cold pressing processing device also includes a heating mechanism, which includes a heating box, an annular heat-conducting pipe, connecting pipes, a liquid pump, and a heating rod. The heating box is installed on the base, and an annular heat-conducting pipe is provided on the outside of the forming tube. Two connecting pipes are symmetrically connected to the outer wall of the annular heat-conducting pipe. The liquid pump and the heating rod are installed on the heating box. The heating rod is used to heat the heat-conducting medium in the heating box. One connecting pipe is connected to the liquid outlet of the liquid pump, and the other connecting pipe is connected to the heating box. The liquid inlet of the liquid pump is connected to the inside of the heating box.

[0011] Furthermore, the annular heat pipe has at least one partition ring, which divides the inner cavity of the annular heat pipe into multiple heat-conducting chambers, and all multiple heat-conducting chambers are connected to the connecting pipe.

[0012] Furthermore, a buffer block is connected to the right end of the powder filling box.

[0013] The beneficial effects of the present invention are: 1. The present invention demolds by setting the molding platform and the molding tube to move down synchronously, and pushes the workpiece from the lower mold into the molding platform by a horizontal ejection method after demolding, which replaces the traditional local ejection structure and avoids defects such as indentation, dent, micro-crack or edge chipping caused by the small effective area of ​​the ejection column and stress concentration, thus significantly improving the surface integrity and structural reliability of the workpiece.

[0014] 2. By setting a mold coating mechanism on the powder filling box and a tube wall coating mechanism at the bottom of the forming platform, the mold release agent can be automatically and evenly coated on the end faces of the upper and lower molds and the inner wall of the forming tube before each pressing, which effectively reduces the adhesion between the powder and the mold, fundamentally reduces the demolding resistance, and achieves efficient and non-destructive demolding. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the powder filling box, forming tube, and mold coating mechanism of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the guiding mechanism of the present invention.

[0018] Figure 4 This is a three-dimensional structural diagram of the mold coating mechanism of the present invention.

[0019] Figure 5 This is a cross-sectional view of the guide frame of the present invention.

[0020] Figure 6 This is a partial structural schematic diagram of the mold coating mechanism of the present invention.

[0021] Figure 7This is a schematic diagram of the pipe wall coating mechanism and heating mechanism of the present invention.

[0022] Figure 8 This is a schematic diagram of the structure of the sealing shell, the molded tube, and the annular heat-conducting tube of the present invention.

[0023] Figure 9 This is a cross-sectional view of the tube wall coating mechanism of the present invention.

[0024] Figure 10 This is a partial structural schematic diagram of the heating mechanism of the present invention.

[0025] The components in the attached diagram are labeled as follows: 1: Base, 2: Guide post, 3: Support platform, 4: Hydraulic cylinder, 5: Upper mold, 6: Lower mold, 71: Electric cylinder, 72: Molding platform, 73: Powder filling box, 74: Guiding mechanism, 741: Guide rod, 742: Guide sleeve, 743: Long rack, 744: Electric gear, 75: Molding tube, 76: Mold coating mechanism, 761: Guide frame, 762: Guide plate, 763: Wiping cotton strip, 764: Airbag 765: Air inlet pipe; 766: Y-shaped liquid inlet pipe; 767: Return spring; 77: Buffer block; 8: Pipe wall coating mechanism; 81: Sealing shell; 82: Feeding pipe; 83: Liquid spraying pump; 84: Hose; 85: Flow channel; 86: Annular pipe; 87: Annular groove; 88: Annular sponge; 9: Heating mechanism; 91: Heating box; 92: Annular heat conduction pipe; 93: Connecting pipe; 94: Liquid pump; 95: Heating rod; 96: Separating ring; 10: Scraper. Detailed Implementation

[0026] Example 1: A cemented carbide powder cold pressing apparatus, such as Figures 1-10As shown, the system includes a base 1, guide pillars 2, a support platform 3, a hydraulic cylinder 4, an upper mold 5, a lower mold 6, an electric cylinder 71, a molding platform 72, a powder filling box 73, a guiding mechanism 74, a mold coating mechanism 76, a buffer block 77, and a pipe wall coating mechanism 8. Guide pillars 2 are vertically fixed to the four corners of the top of the base 1. A support platform 3 is connected to the top of the four guide pillars 2. A hydraulic cylinder 4 is installed in the center of the top of the support platform 3. A through hole for the piston rod of the hydraulic cylinder 4 is opened in the center of the support platform 3. The upper mold 5 is connected to the piston rod of the hydraulic cylinder 4. The lower mold 6 is connected to the center of the top of the base 1, and the lower mold 6 is located directly below the upper mold 5. Electric cylinders 71 are embedded on the front and rear sides of the base 1. A molding platform 72 is connected to the upper end of the two electric cylinders 71. The molding platform 72 is slidably connected to the four guide pillars 2 and can move up and down along the guide pillars 2 for molding. A forming tube 75 is embedded in the middle of the top of the platform 72. The forming tube 75 is hollow and slides on the outside of the lower mold 6. The outer diameters of the upper mold 5 and the lower mold 6 are matched with the inner diameter of the forming tube 75 to ensure that the powder is densely formed during the pressing process. A powder feeding box 73 is connected to the top of the forming platform 72 through a guide mechanism 74. A powder inlet pipe is connected to the left end of the powder feeding box 73, and a buffer block 77 is connected to the right end of the powder feeding box 73. The guide mechanism 74 is used to drive the powder feeding box 73 to move horizontally, so as to accurately add the cemented carbide powder into the forming tube 75. A mold coating mechanism 76 is installed on the powder feeding box 73 to apply a release agent to the ends of the upper mold 5 and the lower mold 6 before adding powder. A tube wall coating mechanism 8 is connected to the bottom of the forming platform 72 to apply a release agent to the tube wall of the forming tube 75 before forming to prevent powder adhesion.

[0027] When using this device to form cemented carbide powder, first apply a release agent to the upper mold 5, lower mold 6, and forming tube 75. Then, connect the powder inlet pipe on the powder feeding box 73 to the powder supply equipment, and activate the guiding mechanism 74 to move the powder feeding box 73 to the right above the forming tube 75. At this time, the lower mold 6 has blocked the lower opening of the forming tube 75. Control the powder supply equipment to fill the forming tube 75 with alloy powder through the powder inlet pipe and powder feeding box 73, completing the quantitative material distribution. After material distribution is completed, activate the guiding mechanism 74 to move the powder feeding box 73 to the left to reset. Then, activate the hydraulic cylinder 4, extending its piston rod downwards, moving the upper mold 5 downwards to press the alloy powder in the forming tube 75 into shape. After forming is completed, the piston rod of the hydraulic cylinder 4 resets, and the upper mold 5 retracts. Simultaneously, control the piston rod of the electric cylinder 71 to move downwards, moving the forming platform 72, powder feeding box 73, and forming tube 75 downwards together. At this time, the formed workpiece is supported by the lower mold 6. When the top of the forming platform 72 is flush with the top of the lower mold 6, close the electric cylinder 71. Subsequently, the guiding mechanism 74 is activated again, moving the powder filling box 73 to the right and pushing the molded workpiece to the right, completing the demolding. The buffer block 77 reduces the impact of the powder filling box 73 on the workpiece, preventing damage to the workpiece surface. After demolding, the hydraulic cylinder 4 is activated, moving the upper mold 5 down a certain distance. Then, the guiding mechanism 74 is activated, moving the powder filling box 73 and the mold coating mechanism 76 to the left. Simultaneously, the mold coating mechanism 76 applies release agent to the molding surfaces of the upper mold 5 and the lower mold 6. After the powder filling box 73 returns to its left position, the guiding mechanism 74 is closed, and the hydraulic cylinder 4 is activated, moving the upper mold 5 back up. Simultaneously, the electric cylinder 71 moves the molding platform 72 back up. During this process, the tube wall coating mechanism 8 applies release agent to the inner wall of the molding tube 75. This cyclical operation enables continuous pressing of cemented carbide powder.

[0028] Example 2: Based on Example 1, such as Figure 2 and Figure 3 As shown, the guiding mechanism 74 includes a guide rod 741, a guide sleeve 742, a long rack 743, and an electric gear 744. The front and rear sides of the forming platform 72 are respectively fixedly connected to the guide rods 741 extending in the horizontal direction. The guide sleeves 742 are slidably sleeved on both guide rods 741. The guide sleeves 742 are fixed to the front and rear sides of the top of the powder filling box 73, so that the powder filling box 73 can slide horizontally along the guide rods 741. An electric gear 744 is installed in the middle of the front and rear sides of the powder filling box 73. The front and rear sides of the top of the forming platform 72 are respectively provided with long racks 743 that mesh with the electric gears 744. The electric gears 744 and the long racks 743 form a gear and rack transmission pair. The forward and reverse rotation of the electric gears 744 drives the powder filling box 73 to move precisely back and forth on the forming platform 72, so as to achieve precise distribution of cemented carbide powder.

[0029] When the electric gear 744 rotates forward or reverse, it drives the powder filling box 73 to move to the right or left along the guide rod 741 through the guide sleeve 742 under the meshing action with the long rack 743. This allows it to be accurately positioned above the forming tube 75 during powder filling and to push the workpiece to the right after it is formed, ensuring the accuracy and reliability of the material feeding and demolding process.

[0030] like Figures 4-6 As shown, the mold coating mechanism 76 includes a guide frame 761, a guide plate 762, a wiping cotton strip 763, an air bag 764, an air inlet pipe 765, a Y-shaped liquid inlet pipe 766, and a return spring 767. The guide frame 761 is embedded in the right side of the powder filling box 73. Its interior has two vertically arranged sliding cavities, separated by symmetrically arranged partition plates. Guide plates 762 are slidably installed in the upper and lower sliding cavities, respectively. A return spring 767 connects the guide plate 762 to the partition plate. Each guide plate 762 has a receiving cavity on its outer side, in which a wiping cotton strip 763 for applying the release agent is detachably installed. Each side is connected to a scraper 10. An airbag 764 is provided between the two guide plates 762. The airbag 764 is fixedly connected between the two side partition plates. An air inlet pipe 765 is connected to the middle of the airbag 764. The air inlet pipe 765 passes through the guide frame 761 and the rear side wall of the powder box 73 in sequence. An external air source is connected to control the inflation and deflation of the airbag 764, thereby driving the guide plates 762 to move towards or away from each other. The Y-shaped liquid inlet pipe 766 is made of flexible hose material. Its two branch ends are respectively connected to the bottom of the accommodating cavity of the upper and lower guide plates 762. The main end passes through the guide frame 761 and the rear side wall of the powder box 73 and is connected to an external mold release agent supply device. When the mold release agent is injected, it can be evenly delivered to the wiping cotton strip 763 through the Y-shaped liquid inlet pipe 766.

[0031] The airbag 764 is connected to an external air source through the air inlet pipe 765, and the Y-shaped liquid inlet pipe 766 is connected to an external mold release agent supply device. When the hydraulic cylinder 4 moves the upper mold 5 down a certain distance, and at the same time the guide mechanism 74 drives the powder box 73 to move to the left to the predetermined position, the air source is activated to inflate the airbag 764. The expansion of the airbag 764 pushes the upper and lower guide plates 762 to move in opposite directions against the elastic force of the return spring 767, so that the wiping cotton strips 763 and scraper strips 10 on their respective outer sides are respectively pressed against the end faces of the upper mold 5 and the lower mold 6. During the bonding process, the scraper 10 can first scrape off the impurities on the mold end face. At the same time, the external mold release agent supply device is activated. The mold release agent is delivered to the accommodating cavity of the upper and lower guide plates 762 through the Y-shaped liquid inlet pipe 766, so that the wiping cotton strip 763 is fully soaked. During the contact with the mold end face, the mold release agent is evenly applied to its surface, completing the demolding preparation work. When the powder box 73 resets to the left, the air source is controlled to release air, and the air bag 764 contracts accordingly. Under the elastic force of the reset spring 767, the upper and lower guide plates 762 move towards each other and return to the initial position, driving the wiping cotton strip 763 and the scraper 10 on their outer side to move back synchronously, completing the reset action.

[0032] like Figures 7-9 As shown, the pipe wall coating mechanism 8 includes a sealing shell 81, a feeding pipe 82, a spray pump 83, a hose 84, an annular pipe 86, and an annular sponge 88. The bottom of the forming platform 72 is connected to the sealing shell 81, which is sleeved on the outside of the forming pipe 75. The front end of the sealing shell 81 is connected to the feeding pipe 82. The spray pump 83 is installed inside the sealing shell 81. The lower mold 6 has multiple vertically arranged flow channels 85 evenly spaced around its circumference. The upper outer side of the lower mold 6 has an annular groove 87 that communicates with the upper end of the flow channels 85. The annular groove 87 is installed inside the annular groove 87. There is an annular sponge 88, the outer surface of which is in contact with the inner wall of the molding tube 75. An annular tube 86 is connected between the lower ends of each flow channel 85. The annular tube 86 is connected to the outlet of the spray pump 83 through a hose 84. During operation, the spray pump 83 presses the release agent into the annular tube 86 through the hose 84, and then evenly delivers it to the annular groove 87 through each flow channel 85, so that the annular sponge 88 is fully wetted. During the upward movement of the molding platform 72, the release agent is evenly coated on the inner wall of the molding tube 75, effectively preventing the adhesion of hard alloy powder.

[0033] The tube wall coating mechanism 8 is used to apply release agent to the inner wall of the molding tube 75 before each molding process. During the upward reset of the molding platform 72, the spray pump 83 is activated to draw in and pressurize the release agent from the sealing shell 81, which is then transported through the hose 84 to the annular tube 86. From there, it is evenly introduced into the upper annular groove 87 through multiple circumferentially distributed flow channels 85 of the lower mold 6, allowing the annular sponge 88 within the annular groove 87 to fully absorb the release agent. Since the outer surface of the annular sponge 88 is always in contact with the inner wall of the molding tube 75, the release agent can be continuously and evenly coated onto the inner wall of the molding tube 75 during the upward movement of the molding platform 72, effectively preventing powder adhesion. After the molding platform 72 completes its upward reset, the spray pump 83 is turned off. If the release agent in the sealing shell 81 is insufficient, it can be replenished promptly through the feeding pipe 82.

[0034] Example 3: Based on Example 2, such as Figure 7 and Figure 8 As shown, the cemented carbide powder cold pressing processing device also includes a heating mechanism 9. The heating mechanism 9 includes a heating box 91, an annular heat-conducting pipe 92, a connecting pipe 93, a liquid pump 94, and a heating rod 95. The heating box 91 is installed on the top left side of the base 1. An annular heat-conducting pipe 92 is provided on the outside of the forming tube 75. The front and rear sides of the annular heat-conducting pipe 92 are respectively connected to the connecting pipe 93. The liquid pump 94 and the heating rod 95 are installed on the heating box 91. The heating rod 95 is used to heat the heat-conducting medium in the heating box 91. The liquid outlet of the liquid pump 94 is connected to the front connecting pipe 93, and the liquid inlet of the liquid pump 94 is connected to the inside of the heating box 91. The rear connecting pipe 93 is connected to the rear side of the heating box 91.

[0035] like Figure 10 As shown, a partition ring 96 is provided in the middle of the annular heat pipe 92. The partition ring 96 divides the inner cavity of the annular heat pipe 92 into two heat conduction chambers, and both heat conduction chambers are connected to the connecting pipe 93.

[0036] The heating mechanism 9 is used to provide auxiliary heating for the forming tube 75, thereby improving powder flowability or molding performance. The heating chamber 91 is filled with heat transfer oil. The heating rod 95 is started to heat the heat transfer oil, and then the liquid pump 94 is started to draw the heat transfer oil from the heating chamber 91 and pump it into the annular heat transfer pipe 92 through the front connecting pipe 93, so that the heat transfer oil can flow in the upper and lower chambers, thereby uniformly heating the outer wall of the forming tube 75. The heated heat transfer oil flows back to the heating chamber 91 through the rear connecting pipe 93, forming a closed loop to achieve stable temperature control of the forming tube 75.

Claims

1. A cemented carbide powder cold-pressing processing device, comprising a base (1), a guide column (2) and a support table (3), the support table (3) is connected to the top of the base (1) through the guide column (2), a hydraulic cylinder (4) is arranged on the support table (3), an upper die (5) is connected to the piston rod of the hydraulic cylinder (4), and a lower die (6) is connected to the top of the base (1), characterized in that, The base (1) is provided with an electric cylinder (71), the piston rod of the electric cylinder (71) is connected with a forming platform (72), the forming platform (72) is embeddedly connected with a forming tube (75), the forming tube (75) is sleeved outside the lower mold (6), the outer diameters of the upper mold (5) and the lower mold (6) are matched with the inner diameter of the forming tube (75), the top of the forming platform (72) is connected with a powder adding box (73) through a guide mechanism (74), the guide mechanism (74) is used for driving the powder adding box (73) to move in the horizontal direction, the powder adding box (73) is provided with a mold smearing mechanism (76), which is used for smearing release agent on the end portions of the upper mold (5) and the lower mold (6) before powder adding, and the bottom of the forming platform (72) is connected with a tube wall smearing mechanism (8), which is used for smearing release agent on the tube wall of the forming tube (75) before forming.

2. A device for cold pressing of cemented carbide powder according to claim 1, characterized in that The guide mechanism (74) comprises a guide rod (741), a guide sleeve (742), a long rack (743) and an electric gear (744), the top of the forming platform (72) is fixedly connected with the guide rod (741) extending in the horizontal direction, the guide sleeve (742) is sleeved on the guide rod (741) in a sliding mode, the guide sleeve (742) is fixed to the top of the powder adding box (73), so that the powder adding box (73) can slide horizontally along the guide rod (741), the powder adding box (73) is provided with the electric gear (744) on the outside, and the top of the forming platform (72) is provided with the long rack (743) engaged with the electric gear (744).

3. A device for cold pressing of cemented carbide powder according to claim 1, c h a r a c t e r i s e d in that The mold smearing mechanism (76) comprises a guide frame (761), guide plates (762), wiping cotton bars (763), air bags (764), air inlet pipes (765), Y-shaped liquid inlet pipes (766) and return springs (767), the guide frame (761) is embedded on one side of the powder adding box (73), the guide plates (762) are slidably arranged on the inner upper and lower sides of the guide frame (761), respectively, the middle of the guide frame (761) is provided with a partition plate, the return springs (767) are connected between the guide plates (762) and the partition plate, one side of each of the guide plates (762) facing the outside is provided with a containing cavity, the wiping cotton bar (763) is detachably arranged in the containing cavity, the air bag (764) is arranged between the two guide plates (762), the air bag (764) is connected to the partition plate, the air inlet pipe (765) is connected to the air bag (764), and the two branch ends of the Y-shaped liquid inlet pipe (766) are communicated with the containing cavities of the upper and lower guide plates (762).

4. A device for cold pressing a cemented carbide powder according to claim 3, c h a r a c t e r i s e d in that One side of each of the guide plates (762) facing the outside is connected with a scraping strip (10).

5. A device for cold pressing a cemented carbide powder according to claim 1, c h a r a c t e r i s e d in that The tube wall coating mechanism (8) includes a sealing shell (81), a feeding pipe (82), a spray pump (83), a hose (84), an annular pipe (86), and an annular sponge (88). The bottom of the molding platform (72) is connected to the sealing shell (81), the feeding pipe (82) is connected to the sealing shell (81), the spray pump (83) is installed inside the sealing shell (81), the lower mold (6) has multiple vertically arranged flow channels (85) at equal intervals around its circumference, the upper outer side of the lower mold (6) has an annular groove (87) that communicates with the upper end of the flow channel (85), the annular sponge (88) is installed in the annular groove (87), the annular sponge (88) contacts the inner wall of the molding tube (75), the lower ends of each flow channel (85) are connected to the annular pipe (86), and the annular pipe (86) is connected to the outlet of the spray pump (83) through a hose (84).

6. A device for cold pressing a cemented carbide powder according to claim 1, c h a r a c t e r i s e d i n that The cemented carbide powder cold pressing processing device also includes a heating mechanism (9). The heating mechanism (9) includes a heating box (91), an annular heat-conducting pipe (92), a connecting pipe (93), a liquid pump (94), and a heating rod (95). The heating box (91) is installed on the base (1). An annular heat-conducting pipe (92) is provided on the outside of the forming tube (75). Two connecting pipes (93) are symmetrically connected to the outer wall of the annular heat-conducting pipe (92). The liquid pump (94) and the heating rod (95) are installed on the heating box (91). The heating rod (95) is used to heat the heat-conducting medium in the heating box (91). One connecting pipe (93) is connected to the liquid outlet of the liquid pump (94), and the other connecting pipe (93) is connected to the heating box (91). The liquid inlet of the liquid pump (94) is connected to the inside of the heating box (91).

7. A device for cold pressing of cemented carbide powder according to claim 6, c h a r a c t e r i s e d i n that At least one partition ring (96) is provided on the annular heat pipe (92). The partition ring (96) divides the inner cavity of the annular heat pipe (92) into multiple heat-conducting chambers, and all multiple heat-conducting chambers are connected to the connecting pipe (93).

8. A device for cold pressing a cemented carbide powder according to claim 1, c h a r a c t e r i s e d i n that A buffer block (77) is connected to the right end of the powder filling box (73).

Images