A feed device for processing of a cemented carbide wax former

Abstract

The present application relates to the technical fields of metal powder processing, in particular to a kind of hard alloy wax forming agent processing feed device, including rack, upper punch module being arranged in the rack, workbench being arranged below the upper punch module, die cavity being opened in the workbench, lower punch module being arranged directly below the die cavity, and blanking assembly being arranged on the workbench, the blanking assembly includes material shoe, blanking pipe and air cylinder.The material shoe is arranged on the workbench, and the present application directly destroys the arch structure of powder in die cavity by the uniform surface pressure generated by the weight of pressing plate, solves the bridging phenomenon in powder filling process, ensures that powder can be uniformly filled in die cavity, avoids the problem of incomplete or uneven filling caused by bridging, and at the same time, the material supplementing function of pressing plate can suck the powder not entering die cavity into material supplementing hole, and supplement the powder into die cavity during the return process of pressing plate, further solve the problem of die cavity material shortage.

Description

Technical Field

[0001] This invention relates to the field of metal powder processing technology, specifically to a feeding device for processing hard alloy wax forming agents. Background Technology

[0002] As a high-performance material, cemented carbide is widely used in modern industry, including cutting tools, mining machinery, and aerospace, due to its excellent hardness, wear resistance, and impact resistance. However, the processing of cemented carbide is complex, especially in the forming stage. Traditional processing methods often fail to meet the demands for high precision, high efficiency, and complex shapes. In recent years, with the continuous development of powder metallurgy technology, powder forming machines have gradually become one of the important pieces of equipment in the cemented carbide processing field. Among them, servo powder forming machines, with their high precision, high repeatability, and high degree of automation, have become an ideal choice for cemented carbide wax forming agent processing. In the production process of cemented carbide, wax forming agent is one of the key raw materials, which can effectively improve the flowability of powder and enhance the forming quality.

[0003] A servo powder molding machine is an advanced powder molding equipment. Its working principle is based on precise servo motor control. It compresses and shapes powder materials through a mold. Specifically, the powder material is automatically poured into the female mold through a hopper, feed pipe, and feed shoe. Then, the servo motor drives the upper mold to move downward, applying pressure to the powder, causing it to undergo plastic deformation or flow recombination to form a compact molded body. When the pressure reaches the preset value, the servo motor maintains the pressure for a period of time to fully compact and solidify the powder material. Finally, the servo motor drives the upper mold to move upward to complete the demolding. However, during the filling process, if the powder filling speed is too fast or the filling pressure is too high, the interaction force between powder particles will increase rapidly. This rapid accumulation can easily cause the powder particles to form an arched structure in the mold cavity, thereby hindering the flow of subsequent powder and causing bridging during the powder filling process, resulting in uneven filling. Especially in multi-step molds, powder tends to accumulate in corners or steps, and the powder distribution is prone to be uneven during the filling process. In addition, there is less powder in the front of the mold cavity than in the rear. This is mainly because the powder flows backward during the backward scraping process of the material shoe, and the powder stays in the rear of the mold cavity for a longer time than in the front, resulting in the mold cavity not being completely filled, forming a material shortage phenomenon, which affects the quality and integrity of the molded product.

[0004] To avoid bridging and uneven filling during the powder filling process, existing servo powder molding machines typically use vibratory mixers to assist powder flow. Vibration reduces friction between powder particles, thereby improving filling performance. However, this method is not ideal for tungsten-cobalt powders because they have high viscosity and cohesive forces between particles. Vibration not only fails to break the adhesion between particles but also exacerbates the problem of uneven filling. Furthermore, the particle shape and particle size distribution of tungsten-cobalt powders also affect their response to vibration. Irregular particle shapes or wide particle size distributions result in even more uneven powder distribution inside the mold during vibration.

[0005] To address this, a feeding device for processing hard alloy wax molding agent is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a feeding device for processing cemented carbide wax molding agent. After the initial filling is completed by the material shoe, the position of the pressure plate is changed so that the pressure plate enters the mold cavity. The uniform surface pressure generated by the pressure plate's own weight destroys the powder bridging structure. At the same time as destruction, the pressure plate also solves the problem of insufficient material in the mold cavity.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A feeding device for processing cemented carbide wax molding agent includes a frame, an upper punch die set within the frame, a worktable set below the upper punch die set, a mold cavity opened on the worktable, a lower punch die set directly below the mold cavity, and a feeding assembly set on the worktable. The feeding assembly includes a feed shoe, a feeding pipe, and a cylinder. The material shoe is set on the worktable, the feeding tube is set on the top of the material shoe, and the cylinder is set on both sides of the material shoe. The upper punch and lower punch are symmetrically distributed and aligned with the center line of the mold cavity as a reference. A straight groove is opened at the bottom of the material shoe. A linkage component is set inside the material shoe. A pressing component is set on the linkage component. A pressure plate is set on the pressing component. The pressure plate is set on the left half of the straight groove. Multiple sets of feeding holes are opened on the pressure plate. The pressure plate has a circular structure and the outline size of the pressure plate is smaller than the diameter of the mold cavity. After the material shoe initially fills the mold cavity with powder, the linkage component and the pressing component cooperate to drive the pressure plate to descend, destroying the powder bridging phenomenon in the mold cavity and simultaneously replenishing the mold cavity. When the material shoe resets, the pressure plate automatically resets.

[0009] In existing technologies, due to the irregular particle shape and wide particle size distribution of tungsten-cobalt powders, traditional vibration methods are not suitable for preventing bridging during filling. Vibration can actually lead to more uneven powder distribution within the mold, affecting subsequent molding results. To address this issue, this device optimizes the powder filling process by incorporating a linkage component and a pressing component. When the material shoe completes filling and resets, the linkage and pressing components work together to apply pressure to the powder within the mold cavity. This pressure effectively reduces bridging between the powder particles. As the powder is filled, it descends within the mold cavity. However, this process can lead to a shortage of material at the top of the mold cavity. To address this issue, the device incorporates a replenishing hole on the pressure plate. As the pressing assembly applies pressure to the powder within the mold cavity, the replenishing hole on the pressure plate replenishes the mold cavity in a timely manner. After replenishment, the material shoe resets and the replenished mold cavity is leveled to ensure a smooth powder surface. Subsequently, the upper and lower punches move closer together to fully compact and solidify the powder material within the mold cavity, ultimately forming the desired molded product.

[0010] This device utilizes the filling function of the material shoe in existing technology. After the material shoe completes the initial filling, the movement of the material shoe unlocks the linkage component and the pressing component. The two work together to apply a certain pressure to the powder in the mold cavity, so that the gaps between the powders can be filled. At the same time, the feeding hole on the pressure plate will perform secondary filling of the mold cavity during the pressure application process. This effectively solves the problems of bridging and insufficient material at the top of the mold cavity caused by the irregular shape and wide particle size distribution of tungsten cobalt powder particles. It improves the uniformity of powder filling and the density of powder in the mold cavity, further improving the quality of the molded products and production efficiency, and realizes the optimization and improvement of existing technology.

[0011] Preferably, the linkage component includes a baffle, a fixed block, a fixed rod, a moving block, a spring, a limiting block, and a limiting rod. The baffle is disposed on the left side of the material shoe, the fixed block is disposed inside the material shoe, the fixed rod is disposed on the fixed block, and the end of the fixed rod is located between the baffle and the side wall of the material shoe. The baffle corresponds to the moving block, the moving block is disposed at the end of the fixed rod, the spring is disposed on the side of the moving block and the end of the spring is disposed inside the fixed block, the limiting block is disposed inside the fixed block and connected to the end of the spring, and the limiting rod is disposed on the limiting block. It can be seen that in the prior art, when the material shoe is filled, the cylinder drives the material shoe to reciprocate through the mold cavity, thereby sending the metal powder in the material shoe into the mold cavity. After filling is completed, the material shoe will drive the moving block to press against the baffle. When the baffle moves, it will unlock the pressing component.

[0012] Preferably, the fixing block is attached to the inner wall of the material shoe, and the end of the fixing block inside the material shoe does not exceed the center line of the material shoe. As can be seen from the above technical solution, the moving block and the spring will extend and retract on the side wall of the material shoe, so that the side wall of the material shoe will have a cavity to facilitate the movement of the spring. This device attaches the fixing block to the inner wall of the material shoe, thereby preventing powder from being discharged from the cavity.

[0013] Preferably, the pressing assembly includes a movable plate, a second spring, a limiting groove, and a connecting rod. The movable plate is disposed within the fixed block, the second spring is disposed between the side wall of the fixed block and the movable plate, the limiting groove is formed at the edge of the movable plate and corresponds to the limiting rod, the connecting rod is disposed at the bottom of the movable plate, and the pressure plate is disposed at the bottom of the connecting rod. The material shoe will drive the movable block to press against the baffle. When the baffle moves, it will drive the movable plate to detach from the top of the fixed block and descend within the fixed block. Then, the connecting rod will drive the pressure plate to descend.

[0014] Preferably, the pressure plate includes an upper pressure plate and a lower pressure plate. The upper pressure plate has an inclined groove that engages with the upper edge of the mold cavity. The lower pressure plate is located at the bottom of the connecting rod. The material filling hole passes through both the upper and lower pressure plates. The diameter of the lower pressure plate is smaller than that of the upper pressure plate. In the above technical solution, when the material shoe returns to its original position, the pressure plate falls into the mold cavity. At this time, the material shoe continues to move backward. To avoid the pressure plate affecting the path of the material shoe during its movement, the device has an inclined groove on the upper pressure plate. When the pressure plate passes through the mold cavity, the inclined groove engages with the edge of the mold cavity, lifting the pressure plate and ensuring that the pressure plate does not obstruct the normal path of the material shoe. This achieves smooth coordination between the two, ensuring the stable operation and continuous operation of the device.

[0015] Preferably, a sleeve rod is provided at the bottom of the fixing block corresponding to the connecting rod, and a sliding rod is provided at the bottom of the sleeve rod. The sliding rod is slidably connected to the sleeve rod, and a spiral groove is opened in the sleeve rod. The connecting rod is limited in the spiral groove. The upper pressure plate is connected to the sliding rod. When the pressure plate descends, the upper pressure plate will drive the sliding rod and the connecting rod to slide downward. When sliding, the connecting rod can still rotate under the limitation of the spiral groove, so as to ensure the uniformity of powder feeding after the subsequent pressure plate compacts the powder and can still rotate to disperse the powder.

[0016] Preferably, the connecting rod is rotatably connected to the movable plate, and a slider is also provided on the top of the lower pressure plate, and the lower pressure plate is rotatably connected to the upper pressure plate through the slider.

[0017] Preferably, the material shoe is further provided with an extrusion block, which is triangular in shape. The hypotenuse of the extrusion block is opposite to the inclined groove on the upper pressure plate. A spring is also provided on one side of the extrusion block, and a connecting rod is provided at one end of the spring. The connecting rod is provided on the side wall of the material shoe and corresponds to the extrusion block. A push rod is also provided on the side of the worktable corresponding to the connecting rod. The push rod is "L" shaped. As can be seen from the above scheme, the pressure plate will descend and fit against the worktable surface during the material shoe reset process. In order to ensure that the pressure plate will not affect the filling of the material shoe when the material shoe is filling the lower mold, the extrusion block and the inclined groove are used to restore the pressure plate and remove it from the worktable surface.

[0018] Preferably, the position of the push rod corresponds to the extrusion block, and the end of the push rod parallel to the worktable is higher than the position of spring three. This device is configured such that the end of the push rod parallel to the worktable is higher than the position of spring three, which can ensure that the push rod can accurately push the extrusion block into the material shoe during the material shoe restoration process.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention uses the uniform surface pressure generated by the weight of the pressure plate to directly break the arched structure of the powder in the mold cavity, solving the bridging phenomenon during the powder filling process. This ensures that the powder can fill the mold cavity evenly and avoids incomplete or uneven filling caused by bridging. At the same time, the material replenishing function of the pressure plate can suck the powder that has not entered the mold cavity into the material replenishing hole and replenish the powder into the mold cavity during the return of the pressure plate, further solving the problem of insufficient material in the mold cavity.

[0021] 2. During the pressing stage, the equipment utilizes the weight and movement of the pressure plate to not only disrupt the bridging structure but also push the accumulated powder and the powder in the feeding holes into the mold cavity together. This eliminates the need for secondary feeding, improving powder filling efficiency. Furthermore, the rotation of the lower pressure plate as it leaves the mold cavity smooths out the feeding material, evenly distributing the powder within the mold cavity and further enhancing the uniformity of powder filling. This, in turn, improves the final product molding quality.

[0022] 3. During the powder molding process, when the pressure plate detaches from the mold cavity, an upward suction force is generated. This suction force can reduce the adhesion of powder to the inner wall of the mold cavity, making it easier for the molded body to be ejected from the mold cavity. This device not only improves the demolding efficiency, but also avoids damage or deformation to the molded body caused by the adhesion of powder to the inner wall of the mold cavity during the demolding process, thereby ensuring the quality of the molded body. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a feeding device for processing cemented carbide wax molding agent according to the present invention;

[0024] Figure 2This is a schematic diagram of the structure of a feeding device for processing cemented carbide wax molding agent according to the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the material boot of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the material boot of the present invention from another angle;

[0027] Figure 5 This is a cross-sectional structural diagram of the fixing block of the present invention;

[0028] Figure 6 This is a two-dimensional cross-sectional view of the fixing block of the present invention;

[0029] Figure 7 This is a schematic diagram of the spiral groove structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the pressure plate of the present invention;

[0031] Figure 9A is a preliminary feeding state diagram of a feeding device for processing hard alloy wax molding agent according to the present invention.

[0032] Figure 9B is a preliminary filling state diagram of a feeding device for processing cemented carbide wax molding agent according to the present invention.

[0033] Figure 9C is a diagram showing the pressure plate descending state of a feeding device for processing cemented carbide wax molding agent according to the present invention.

[0034] Figure 9D is a diagram showing the state of powder being pressed down by the pressure plate of a feeding device for processing cemented carbide wax forming agent according to the present invention.

[0035] Figure 9-E This is a diagram showing the restored state of the pressure plate of a feeding device for processing cemented carbide wax molding agent according to the present invention.

[0036] In the diagram: 1. Frame; 2. Upper punch module; 3. Worktable; 4. Mold cavity; 5. Lower punch module; 6. Feeding assembly; 61. Material shoe; 62. Feeding pipe; 63. Cylinder; 7. Straight groove; 8. Linkage assembly; 9. Lower pressing assembly; 10. Pressure plate; 11. Feeding hole; 81. Baffle; 82. Fixed block; 83. Moving block; 84. Spring 1; 85. Limiting block; 86. Limiting rod; 91. Movable plate; 92. Spring 2; 93. Limiting groove; 94. Connecting rod; 101. Upper pressure plate; 102. Lower pressure plate; 1011. Inclined groove; 87. Sleeve rod; 88. Sliding rod; 89. Spiral groove; 1021. Slider; 611. Extrusion block; 612. Spring 3; 613. Connecting rod; 614. Push rod. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1 As shown in Figure 9, the present invention provides a feeding device for processing cemented carbide wax forming agents, the technical solution of which is as follows:

[0039] As one embodiment of the present invention, refer to Figures 1-3 A feeding device for processing hard alloy wax molding agent includes a frame 1, an upper punching die 2 disposed in the frame 1, a worktable 3 disposed below the upper punching die 2, a mold cavity 4 opened on the worktable 3, a lower punching die 5 disposed directly below the mold cavity 4, and a feeding assembly 6 disposed on the worktable 3. The feeding assembly 6 includes a material shoe 61, a feeding pipe 62, and a cylinder 63. The material shoe 61 is set on the workbench 3, the material discharge pipe 62 is set on the top of the material shoe 61, and the cylinder 63 is set on both sides of the material shoe 61. The upper punch module 2 and the lower punch module 5 are symmetrically distributed and centered with the center line of the mold cavity 4 as the reference. The bottom of the material shoe 61 has a straight groove 7. The material shoe 61 is equipped with a linkage component 8, a pressing component 9 is set on the linkage component 8, and a pressure plate 10 is set on the pressing component 9. The pressure plate 10 is set on the left half of the straight groove 7. The pressure plate 10 has multiple sets of material filling holes 11. The pressure plate 10 has a circular structure and the outline size of the pressure plate 10 is smaller than the diameter of the mold cavity 4. After the material shoe 61 initially fills the mold cavity 4 with powder, the linkage component 8 and the pressing component 9 cooperate to drive the pressure plate 10 to descend and destroy the powder bridging phenomenon in the mold cavity 4 and simultaneously replenish the mold cavity 4. When the material shoe 61 is reset, the pressure plate 10 automatically resets.

[0040] In existing technologies, because tungsten-cobalt powders typically have irregular particle shapes and wide particle size distributions, traditional vibration methods are not suitable for preventing bridging during filling. Vibration can actually lead to more uneven powder distribution within the mold, affecting subsequent molding results. To address this issue, this device optimizes the powder filling process by incorporating a linkage component 8 and a pressing component 9. When the material shoe 61 completes filling and resets, it triggers the linkage component 8, causing it to lower the pressing component 9 to the working platform. As the pressing component 9 passes, it applies pressure to the powder within the mold cavity 4. This pressure causes the powder particles to... The bridging phenomenon is filled, and the powder as a whole descends within the mold cavity 4. However, the descent of the powder as a whole can lead to a shortage of material at the top of the mold cavity 4. To solve the problem of insufficient material at the top of the mold cavity 4, the device is equipped with a feeding hole 11 on the pressure plate 10. When the pressing component 9 applies pressure to the powder in the mold cavity 4, the feeding hole 11 on the pressure plate 10 will promptly replenish the mold cavity 4. After the replenishment is completed, the material shoe 61 is reset and the replenished mold cavity 4 is scraped flat to ensure that the powder surface in the mold cavity 4 is flat. Subsequently, the upper punch 2 and the lower punch 5 approach each other to fully compact and solidify the powder material in the mold cavity 4, ultimately forming the desired molded product.

[0041] This device utilizes the filling function of the material shoe 61 in the existing technology. After the material shoe 61 completes the initial filling, the movement of the material shoe 61 unlocks the linkage component 8 and the pressing component 9. The two work together to apply a certain pressure to the powder in the mold cavity 4, so that the gaps between the powders can be filled. At the same time, the feeding hole 11 on the pressure plate 10 will perform secondary filling of the mold cavity 4 during the pressure application process. This effectively solves the problems of bridging during filling and insufficient material at the top of the mold cavity 4 caused by the irregular shape and wide particle size distribution of tungsten cobalt powder particles. It improves the uniformity of powder filling and the density of powder in the mold cavity 4, further improving the quality of the molded products and production efficiency, and realizing the optimization and improvement of the existing technology.

[0042] As one embodiment of the present invention, refer to Figures 4-5 The linkage component 8 includes a baffle 81, a fixing block 82, a fixing rod, a moving block 83, a spring 84, a limiting block 85, and a limiting rod 86. The baffle 81 is located on the left side of the material shoe 61. The fixing block 82 is located inside the material shoe 61. The fixing rod is located on the fixing block 82, with the end of the fixing rod located between the baffle 81 and the side wall of the material shoe 61. The baffle 81 corresponds to the moving block 83, which is located at the end of the fixing rod. The spring 84 is located on the side of the moving block 83, with the end of the spring 84 located inside the fixing block 82. The limiting block 85 is located inside the fixing block 82 and connected to the end of the spring 84. The limiting rod 86 is located on the limiting block 85.

[0043] As can be seen, in the prior art, when the material shoe 61 is filled, the cylinder 63 will drive the material shoe 61 to reciprocate through the mold cavity 4, thereby sending the metal powder in the material shoe 61 into the mold cavity 4. After the filling is completed, the material shoe 61 will drive the moving block 83 to press against the baffle 81. Then the pressure plate 10 will drive the spring 84 to move into the fixed block 82, thereby causing the spring 84 to drive the limit block 85 to move into the material shoe 61. When the fixed block 82 moves, it will unlock the state of the pressing component 9.

[0044] As one embodiment of the present invention, refer to Figure 1 The fixing block 82 is attached to the inner wall of the material shoe 61. The end of the fixing block 82 inside the material shoe 61 does not exceed the center line of the material shoe 61. As can be seen from the above technical solution, the moving block 83 and the spring 84 will extend and retract on the side wall of the material shoe 61, so that the side wall of the material shoe 61 will have a cavity to facilitate the movement of the spring 84. This device attaches the fixing block 82 to the inner wall of the material shoe 61, thereby preventing the powder from being discharged from the cavity. Furthermore, the fact that the end of the fixing block 82 inside the material shoe 61 does not exceed the center line of the material shoe 61 means that the fixing block 82 will not obstruct the descent of the powder when the material is being discharged from the discharge pipe 62.

[0045] As one embodiment of the present invention, refer to Figures 3-5 The pressing component 9 includes a movable plate 91, a second spring 92, a limiting groove 93, and a connecting rod 94. The movable plate 91 is disposed inside the fixed block 82. The second spring 92 is disposed between the side wall of the fixed block 82 and the movable plate 91. The limiting groove 93 is opened at the edge of the movable plate 91 and corresponds to the limiting rod 86. The connecting rod 94 is disposed at the bottom of the movable plate 91. The pressure plate 10 is disposed at the bottom of the connecting rod 94. The material shoe 61 will drive the movable block 83 to press against the baffle 81. When the baffle 81 moves, it will drive the limiting groove 93 and the limiting rod 86 on the movable plate 91 to disengage, thereby releasing the limiting of the movable plate 91 from the top of the fixed block 82 and descending inside the fixed block 82. Then the connecting rod 94 will drive the pressure plate 10 to descend.

[0046] As one embodiment of the present invention, refer to Figure 1The pressure plate 10 includes an upper pressure plate 101 and a lower pressure plate 102. The upper pressure plate 101 has an inclined groove 1011 that engages with the upper edge of the mold cavity 4. The lower pressure plate 102 is located at the bottom of the connecting rod 94. The feeding hole 11 passes through both the upper pressure plate 101 and the lower pressure plate 102. The diameter of the lower pressure plate 102 is smaller than the diameter of the upper pressure plate 101. In the above technical solution, when the material shoe 61 returns to its original position, the pressure plate 10 falls into the mold cavity 4. At this time, the material shoe 61... It will continue to move backward. In order to avoid the pressure plate 10 affecting the path of the material shoe 61 during its movement, the device has a sloping groove 1011 on the upper pressure plate 101. When the pressure plate 10 passes through the mold cavity 4, the sloping groove 1011 cooperates with the edge of the mold cavity 4 to lift the pressure plate 10, thereby ensuring that the pressure plate 10 will not obstruct the normal path of the material shoe 61. This achieves smooth cooperation between the two and ensures the stable operation of the device and the continuity of operation.

[0047] As one embodiment of the present invention, refer to Figures 7-8 The bottom of the fixed block 82 is also provided with a sleeve 87 corresponding to the connecting rod 94. The bottom of the sleeve 87 is provided with a sliding rod 88, which is slidably connected to the sleeve 87. A spiral groove 89 is opened in the sleeve 87. The connecting rod 94 is limited in the spiral groove 89. The upper pressure plate 101 is connected to the sliding rod 88. When the pressure plate 10 descends, in the initial state, the feeding hole 11 on the upper pressure plate 101 and the feeding hole 11 on the lower pressure plate 102 are not misaligned. The upper pressure plate 101 will drive the sliding rod 88 and the connecting rod 94 to slide downward. When sliding, the connecting rod 94 rotates under the limitation of the spiral groove 89. At this time, the two sets of feeding holes 11 are aligned, and the powder can enter the feeding hole 11. When the pressure plate 10 is raised, the upper pressure plate 101 and the lower pressure plate 102 are misaligned, so that the powder can still be rotated and dispersed after the pressure plate 10 compacts the powder, ensuring the uniformity of the powder feeding.

[0048] As one embodiment of the present invention, refer to Figure 8 The connecting rod 94 is rotatably connected to the movable plate 91, and the top of the lower pressure plate 102 is also provided with a slider 1021. The lower pressure plate 102 is rotatably connected to the upper pressure plate 101 through the slider 1021.

[0049] As one embodiment of the present invention, refer to Figures 3-4The material shoe 61 is also provided with an extrusion block 611. The extrusion block 611 is triangular in shape, and the hypotenuse of the extrusion block 611 is opposite to the inclined groove 1011 on the upper pressure plate 101. A spring 612 is also provided on one side of the extrusion block 611. A connecting rod 613 is provided at one end of the spring 612. The connecting rod 613 is provided on the side wall of the material shoe 61 and corresponds to the extrusion block 611. A push rod 614 is also provided on the side of the worktable 3 corresponding to the connecting rod 613. The push rod 614 is "L" shaped. As can be seen from the above scheme, the pressure plate 10 will descend and fit against the surface of the worktable 3 during the reset process of the material shoe 61. In order to ensure that the pressure plate 10 will not affect the filling of the material shoe 61 when the material shoe 61 is filled for the lower mold, the pressure plate 10 is restored and separated from the surface of the worktable 3 by the cooperation of the extrusion block 611 and the inclined groove 1011.

[0050] As one embodiment of the present invention, refer to Figure 3 The position of push rod 614 corresponds to the extrusion block 611. The end of push rod 614 parallel to the worktable 3 is higher than the position of spring 612. This device sets the end of push rod 614 parallel to the worktable 3 to be higher than the position of spring 612, which can ensure that push rod 614 can accurately push extrusion block 611 into the material shoe 61 during the material shoe 61 restoration process.

[0051] Working principle: Due to the high viscosity and cohesive force between tungsten-cobalt powder particles, they tend to form arched structures within the mold cavity 4 during filling, hindering the flow of subsequent powder and causing bridging during powder filling. This invention, through the cooperation of the linkage component 8 and the pressing component 9, utilizes the uniform surface pressure generated by the weight of the pressure plate 10 after the initial filling of the material shoe 61 to break the powder bridging structure. Simultaneously, the pressure plate 10 also addresses the issue of insufficient material in the mold cavity 4. Specifically:

[0052] 1. Material pushing and initial filling stage: When the equipment starts, cylinder 63 drives the material shoe 61 to move at a constant speed towards the baffle 81, as shown in the figure. Figure 9-A and Figure 9-B When the material shoe 61 moves, the material feeding pipe 62 feeds the material. At this time, the straight groove 7 on the material shoe 61 forms a closed state with the plane of the worktable 3. The metal powder falls into the rectangular area defined by the straight groove 7. As the material shoe 61 continues to move, the powder is pushed to the entrance of the mold cavity 4 and falls into it.

[0053] 2. Suppression Phase: Refer to Figure 1 , Figure 5 and Figure 9-CAfter the mold cavity 4 is filled, the shoe 61 continues to move. Its front moving block 83 contacts the baffle 81, and the baffle 81 exerts reverse pressure on the moving block 83, causing the moving block 83 to compress the spring 84. The spring 84 drives the limiting block 85 to move to the right. The displacement of the limiting block 85 releases the locking of the movable plate 91. The movable plate 91 descends vertically under the action of gravity, causing the pressure plate 10 to fall onto the worktable 3. The pressure plate 10 fits against the worktable 3, and the feeding hole 11 on the pressure plate 10 forms a negative pressure zone with the residual powder, causing the powder that has not entered the mold cavity 4 to be sucked into the feeding hole 11. Then, the cylinder 63 drives the pressure plate 10 back to its original position. During the return process of the pressure plate 10, it will pass through the mold cavity 4 and cause the powder accumulated on the right side of the pressure plate 10 and the powder in the feeding hole 11 to fall into the mold cavity 4 together. (Refer to...) Figure 9-D When the pressure plate 10 falls above the powder in the mold cavity 4, the pressure generated by the weight of the pressure plate 10 will effectively destroy the arched structure of the powder in the mold cavity 4.

[0054] 3. Powder homogenization stage: Refer to the reference. Figures 5-7 and Figure 9-D After the pressure plate 10 completes pressing, the inclined groove 1011 engages with the edge of the mold cavity 4 and triggers a short-range lifting of the pressure plate 10 by the movement of the pressure plate 10, allowing the pressure plate 10 to easily move out of the mold cavity 4. During the lifting process, the connecting rod 94 engages with the spiral groove 89, thereby driving the lower pressure plate 102 to rotate along with the connecting rod 94. The upper pressure plate 101 remains stationary due to the limit of the sliding rod 88, so the lower pressure plate 102 rotates and forms a misalignment with the upper pressure plate 101, and the feeding hole 11 is closed. When the lower pressure plate 102 rises and rotates, the rotation will smooth the feeding material and distribute the powder evenly in the mold cavity 4. At the moment when the pressure plate 10 leaves the mold cavity 4, the pressure plate 10 will generate an upward suction force at the end of the mold cavity 4. The upward suction force can effectively reduce the adhesion of powder or molded body to the inner wall of the mold cavity 4, making it easier for the molded body to be removed from the mold cavity 4. This suction is similar to a "demolding aid," which can prevent the molded part from being damaged or deformed due to adhesion during the demolding process.

[0055] 4. Automatic reset and final pressing stage: Refer to... Figures 1-4 and Figure 9-EAs the shoe 61 resets, it pushes the remaining metal powder on the left side of the pressure plate 10 into the mold cavity 4, replenishing the insufficient material in the pressure plate 10. As it continues to move, the bottom of the shoe 61 smooths the surface of the mold cavity 4. When the shoe 61 approaches the push rod 614, the push rod 614 pushes the extrusion block 611 horizontally. The wedge-shaped inclined surface of the extrusion block 611 engages with the inclined groove 1011 of the pressure plate 10, pushing the movable plate 91 upwards along the inclined surface. When the limiting groove 93 of the movable plate 91 engages with the fixed rod, the pressure plate 10 completes its reset, forming a complete cycle. At this time, the mold cavity 4 is completely below the upper punch assembly 2, and the upper and lower punches apply pressure to the powder. This pressure causes the powder particles to undergo plastic deformation to form a molded body.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A feeding device for processing hard alloy wax molding agent, comprising a frame (1), an upper punch die (2) disposed within the frame (1), a worktable (3) disposed below the upper punch die (2), a mold cavity (4) opened on the worktable (3), a lower punch die (5) disposed directly below the mold cavity (4), and a feeding assembly (6) disposed on the worktable (3), wherein the feeding assembly (6) comprises a feed shoe (61), a feeding pipe (62), and a cylinder (63), characterized in that: The bottom of the material shoe (61) is provided with a straight groove (7). A linkage component (8) is provided inside the material shoe (61). A pressing component (9) is provided on the linkage component (8). A pressure plate (10) is provided on the pressing component (9). The pressure plate (10) is located on the left half of the straight groove (7). Multiple sets of feeding holes (11) are provided on the pressure plate (10). The pressure plate (10) has a circular structure and its outline size is smaller than the diameter of the mold cavity (4). After the material shoe (61) initially fills the mold cavity (4) with powder, the linkage component (8) and the pressing component (9) work together to drive the pressure plate (10) to descend and destroy the powder bridging phenomenon in the mold cavity (4) and simultaneously replenish the mold cavity (4). When the material shoe (61) is reset, the pressure plate (10) automatically resets.

2. The feeding device for processing hard alloy wax molding agent according to claim 1, characterized in that: The linkage component (8) includes a baffle (81), a fixing block (82), a fixing rod, a moving block (83), a spring (84), a limiting block (85), and a limiting rod (86). The baffle (81) is located on the left side of the material shoe (61). The fixing block (82) is located inside the material shoe (61). The fixing rod is located on the fixing block (82). The end of the fixing rod is located between the baffle (81) and the side wall of the material shoe (61). The baffle (81) corresponds to the moving block (83). The moving block (83) is located at the end of the fixing rod. The spring (84) is located on the side of the moving block (83), and the end of the spring (84) is located inside the fixing block (82). The limiting block (85) is located inside the fixing block (82) and connected to the end of the spring (84). The limiting rod (86) is located on the limiting block (85).

3. The feeding device for processing hard alloy wax molding agent according to claim 2, characterized in that: The fixing block (82) is attached to the inner wall of the material shoe (61), and the end of the fixing block (82) inside the material shoe (61) does not exceed the center line of the material shoe (61).

4. The feeding device for processing hard alloy wax molding agent according to claim 3, characterized in that: The pressing assembly (9) includes a movable plate (91), a second spring (92), a limiting groove (93), and a connecting rod (94). The movable plate (91) is disposed inside the fixed block (82). The second spring (92) is disposed between the side wall of the fixed block (82) and the movable plate (91). The limiting groove (93) is opened at the edge of the movable plate (91) and corresponds to the limiting rod (86). The connecting rod (94) is disposed at the bottom of the movable plate (91). The pressure plate (10) is disposed at the bottom of the connecting rod (94).

5. A feeding device for processing hard alloy wax molding agent according to claim 3 or 4, characterized in that: The pressure plate (10) includes an upper pressure plate (101) and a lower pressure plate (102). The upper pressure plate (101) has a sloping groove (1011) that engages with the upper edge of the mold cavity (4). The lower pressure plate (102) is located at the bottom of the connecting rod (94). The feeding hole (11) passes through the upper pressure plate (101) and the lower pressure plate (102) respectively.

6. The feeding device for processing hard alloy wax molding agent according to claim 5, characterized in that: The bottom of the fixing block (82) is also provided with a sleeve rod (87) corresponding to the connecting rod (94). The bottom of the sleeve rod (87) is provided with a sliding rod (88). The sliding rod (88) is slidably connected to the sleeve rod (87). A spiral groove (89) is opened in the sleeve rod (87). The connecting rod (94) is limited in the spiral groove (89). The upper pressure plate (101) is connected to the sliding rod (88).

7. The feeding device for processing hard alloy wax molding agent according to claim 6, characterized in that: The connecting rod (94) is rotatably connected to the movable plate (91), and a slider (1021) is also provided on the top of the lower pressure plate (102). The lower pressure plate (102) is rotatably connected to the upper pressure plate (101) through the slider (1021).

8. The feeding device for processing hard alloy wax molding agent according to claim 7, characterized in that: The material shoe (61) is also provided with an extrusion block (611), which is triangular in shape. The hypotenuse of the extrusion block (611) is opposite to the inclined groove (1011) on the upper pressure plate (101). A spring three (612) is also provided on one side of the extrusion block (611). A connecting rod (613) is provided at one end of the spring three (612). The connecting rod (613) is provided on the side wall of the material shoe (61) and corresponds to the extrusion block (611). A push rod (614) is also provided on the side of the worktable (3) corresponding to the connecting rod (613). The push rod (614) is "L" shaped.

9. A feeding device for processing hard alloy wax molding agent according to claim 8, characterized in that: The position of the push rod (614) corresponds to the extrusion block (611), and the end of the push rod (614) parallel to the worktable (3) is higher than the position of the spring three (612).

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