Metal chip briquetting machine for industrial waste recovery and briquetting method thereof

Abstract

The present application relates to the technical field of metal powder forming, and discloses a metal scrap cake machine for industrial waste recovery and a briquetting method thereof, which comprises a machine shell, a female die cylinder is arranged in the machine shell, a male die head is arranged in the female die cylinder, a sieve plate with a plurality of blanking ports is fixed to the bottom of the male die head, a hot material assembly is installed in the male die head, the heating mechanism is integrated in the male die head, the thin layer independent preheating and uniform heating of the metal powder are realized through the layered cooperation of the hot material block and the blanking ports of the sieve plate, the metal powder in the female die forms a controllable micro-gradual temperature field with high temperature at the top and low temperature at the bottom, the upper layer of powder is first densified during pressing, a densification wave from top to bottom is formed, the residual gas is driven downward and orderly discharged through the gap at the bottom of the female die, the defect that the shell is first densified to cause gas sealing is avoided, the problems of pores, interlayer and uneven density are effectively eliminated, and the forming quality and process stability of the metal powder waste recovery are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of metal powder forming technology, and in particular to a metal scrap briquetting machine for industrial waste recycling and its briquetting method. Background Technology

[0002] Metal scrap shavings recycling machines for industrial metal powder waste are specifically designed for processing metal powder waste generated during machining, surface treatment, and other processes, such as iron, aluminum, and copper scraps. When this equipment integrates heating functionality into traditional physical pressing, its technical attributes are upgraded from simple physical compression to powder metallurgy hot pressing. This is a powder forming equipment that achieves densification and consolidation of metal powder waste through the synergistic effect of pressure and heat field. Heating is used as a key process parameter; precise temperature control softens the metal powder particles, reduces their yield strength, and promotes atomic diffusion and recrystallization at the particle contact surfaces under high pressure, thereby completing the densification transformation from powder accumulation to metallurgical bonding within the mold cavity. This process involves powder flowability and filling behavior, mold temperature field uniformity control, gas venting mechanisms during pressing, and density distribution and residual stress control of the dense body.

[0003] In existing technologies, metal powder waste pressing equipment with heating assistance typically places the heating mechanism on the inner wall of a concave mold. The powder is heated as a whole within the mold cavity and then directly compressed. This method of heating from the inner wall of the mold results in an uneven temperature field due to the inherent characteristics of the heat conduction path. Powder near the mold wall heats up and softens first due to its shorter heat conduction path, while the central area experiences a temperature lag due to delayed heat conduction. This leads to a difference in the densification sequence during hot pressing, with the outer layer softening first and the inner layer softening later. During pressing, the softened outer layer of powder preferentially densifies under pressure, forming a dense, hard shell. Meanwhile, the volatile substances such as waste oil, moisture, and air that expand due to heat in the still-unsoftened powder inside lose their escape channels due to the sealed shell and are trapped inside the blank by the high pressure. This mismatch in timing, where the outer shell first densifies and the gas then expands, ultimately leads to the formation of pores, interlayers, or microcracks inside the metal disc. This not only causes uneven radial density distribution but also causes the disc to deform or crack due to the volume contraction after the gas cools, becoming a core technological challenge that restricts the quality of hot pressing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has a temperature field that is high outside and low inside due to heating of the inner wall of the die, which causes the outer shell to be preferentially densified to form a hard shell during pressing. The gas that expands due to heat inside cannot be discharged, thus causing defects such as pores, interlayers and uneven density inside the metal cake. To this end, we propose a metal scrap cake machine for industrial waste recycling and its pressing method.

[0005] To achieve the above objectives, this application adopts the following technical solution: a metal scrap briquetting machine for industrial waste recycling and its briquetting method, comprising: a machine housing, wherein a die assembly is installed inside the machine housing, the die assembly includes a die cylinder fixedly connected inside the machine housing, a punch head is inserted inside the die cylinder, a base plate assembly is fixedly connected to the bottom end of the punch head, a hot material assembly is installed inside the punch head, the base plate assembly includes a screen plate fixedly connected to the bottom of the punch head, and a plurality of material discharge ports are evenly spaced inside the screen plate, the hot material assembly includes a fourth hydraulic rod installed at the four corners of the punch head, a spring is fixedly connected to the bottom end of the fourth hydraulic rod, a connecting rod is fixedly connected to the bottom end of the spring, and a plurality of hot material blocks are evenly distributed at the bottom of the connecting rod, the hot material blocks correspond one-to-one with the material discharge ports, and a heating mechanism is installed inside the hot material blocks;

[0006] The top of the punch is provided with a feeding component. The metal powder inside the feeding component enters the punch in batches to be preheated. After each batch of metal powder is preheated, it falls into the die cylinder in layers. During the feeding process, the punch gradually rises. After each layer of material is fed, the punch presses down to compress the metal powder inside the die cylinder into shape.

[0007] Preferably, the hot material block includes a top tip and a bottom plane, and the size of the bottom plane of the hot material block is consistent with the size of the bottom opening of the sieve plate.

[0008] Preferably, the hot material assembly further includes a deflector block with a triangular cross-sectional shape. The deflector block is fixedly connected to the inner wall of the punch head and is used to deflect the hot material block as it passes by.

[0009] Preferably, the material discharge port is shaped like an inverted cone, and the top openings of each material discharge port are connected, with the gap between each material discharge port forming a sliding slope.

[0010] Preferably, a support plate is fixedly connected inside the housing, and a first hydraulic rod is installed on the bottom surface of the support plate. The output end of the first hydraulic rod is fixedly connected to the punch head.

[0011] Preferably, the feeding assembly includes a hopper, a feeding cylinder is fixedly connected to the bottom of the hopper, a spiral screw is installed between the hopper and the feeding cylinder, an opening and closing valve plate is installed inside the feeding cylinder, and a feeding port matching the feeding cylinder is opened at the top of the punch head.

[0012] Preferably, a lifting platform is slidably connected inside the concave mold cylinder, and a second hydraulic rod is installed at the bottom end of the lifting platform, and the second hydraulic rod is fixedly connected to the inside of the machine housing.

[0013] Preferably, a pusher plate is provided on the back of the die cylinder, and a third hydraulic rod is installed on the back of the pusher plate, the third hydraulic rod being fixedly connected to the machine housing.

[0014] Preferably, the die cylinder has a discharge opening on the side away from the pusher plate, and a slide is fixedly connected to the outside of the discharge opening.

[0015] Preferably, it includes the following steps:

[0016] S1. The metal powder inside the hopper is fed into the inside of the punch in batches through the feeding cylinder. The metal powder falls onto the hot material block and the top of the sieve plate. The hot material block heats the metal powder covering its surface.

[0017] S2. After heating is completed, the fourth hydraulic rod drives the connecting rod and each hot material block to rise synchronously. The hot material block is pulled out from the discharge port. At this time, the discharge port is in an open state. The powder that has been heated inside the punch falls into the cavity of the die below through the discharge port. When the hot material block passes the agitator, it is agitated by the agitator, and the connecting rod and each hot material block will shake. This shakes off the metal powder that was originally on the hot material block and the connecting rod and falls into the cavity of the die, completing the heating and laying of the first layer of metal powder inside the die.

[0018] S3. The hot material block descends again to block the discharge port. The second batch of metal powder is fed into the punch again through the feeding cylinder for heating. Similar to the first batch of metal powder, after heating, it falls into the die cylinder. As the metal powder accumulates inside the die cylinder, the punch gradually rises. Each layer of metal powder is heated and accumulated inside the die cylinder in sequence.

[0019] S4. After accumulating to a certain amount, the fourth hydraulic rod drives the hot material block to be tightly squeezed inside the discharge port, so that the bottom surface of the screen plate remains flat. At the same time, the first hydraulic rod drives the punch head to descend and extrude the metal powder inside the die cylinder. During extrusion, the upper metal powder is more compacted and formed first. The residual expansion gas in the powder is gradually squeezed downward and can eventually be discharged downward through the gap between the lifting platform and the die cylinder.

[0020] S5. After the metal powder is extruded into a cake shape, the top of the second hydraulic rod drives the lifting platform to descend to the bottom of the pusher plate, and the third hydraulic rod drives the pusher plate to push forward, discharging the cake-shaped metal waste outward through the discharge opening and slide.

[0021] The technical effects and advantages of this invention are as follows:

[0022] This invention transfers the heating function from the concave die to the inside of the convex die head. Each time, only a thin layer of powder is heated, and uniform heating and sufficient venting are achieved by the tip of the hot material block and the inverted conical hole structure of the sieve plate. During the material feeding process, the convex die head rises with the material layer and uses the bottom surface heat radiation to dynamically keep the accumulated powder warm, forming a controllable micro-gradient temperature field with a higher top and lower bottom. During pressing, the upper layer of powder is densified first, forming a densification wave from top to bottom, driving the residual gas downward and orderly expelling it through the gap at the bottom of the concave die. This completely avoids the defects such as pores, interlayers, and uneven density caused by the outer shell being densified first and the gas being sealed in the traditional process, and significantly improves the molding quality, process stability, and production efficiency of metal powder waste recycling. Attached Figure Description

[0023] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0024] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention;

[0025] Figure 2 This is a three-dimensional structural diagram of the internal structure of the housing of the present invention;

[0026] Figure 3 This is a three-dimensional structural diagram of the entire invention;

[0027] Figure 4 This is a cross-sectional structural diagram of the concave mold assembly of the present invention;

[0028] Figure 5 This is a three-dimensional structural diagram of the first hydraulic rod and the punch head portion of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the internal hot material assembly of the punch head in the lowered state of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the internal hot material assembly of the punch head of the present invention in the raised state;

[0031] Figure 8 This is a three-dimensional structural diagram of the thermal material assembly of the present invention;

[0032] Figure 9 This is a cross-sectional structural diagram of the base plate assembly of the present invention.

[0033] Legend: 1. Machine housing; 2. Die assembly; 3. Punch head; 4. Base plate assembly; 5. Hot material assembly; 6. Supporting cross plate; 7. First hydraulic rod; 8. Feeding assembly; 201. Die cylinder; 202. Lifting platform; 203. Second hydraulic rod; 204. Push plate; 205. Third hydraulic rod; 206. Discharge opening; 207. Slide rail; 401. Screen plate; 402. Drop port; 403. Sliding ramp; 501. Connecting rod; 502. Hot material block; 503. Fourth hydraulic rod; 504. Spring; 505. Actuating block; 801. Hopper; 802. Spiral screw; 803. Feeding cylinder. Detailed Implementation

[0034] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0035] Reference Figure 1 , Figure 4 , Figure 6 , Figure 7 and Figure 9 As shown, the present invention provides a technical solution: a metal scrap briquetting machine for industrial waste recycling and its briquetting method, comprising: a machine housing 1, a die assembly 2 installed inside the machine housing 1, the die assembly 2 including a die cylinder 201 fixedly connected inside the machine housing 1, a punch head 3 inserted inside the die cylinder 201, a base plate assembly 4 fixedly connected to the bottom end of the punch head 3, a hot material assembly 5 installed inside the punch head 3, the base plate assembly 4 including a screen plate 401 fixedly connected to the bottom of the punch head 3, and a plurality of material discharge ports 402 evenly spaced inside the screen plate 401, the hot material assembly 5 including a fourth hydraulic rod 503 installed at the four corners of the punch head 3, a spring 504 fixedly connected to the bottom end of the fourth hydraulic rod 503, a connecting rod 501 fixedly connected to the bottom end of the spring 504, and a plurality of hot material blocks 502 evenly distributed at the bottom of the connecting rod 501, the hot material blocks 502 corresponding one-to-one with the material discharge ports 402, and a heating mechanism installed inside the hot material blocks 502;

[0036] The top of the punch 3 is provided with a feeding component 8. The metal powder inside the feeding component 8 enters the punch 3 in batches to be preheated. After each batch of metal powder is preheated, it falls into the cavity 201 in layers. During the feeding process, the punch 3 gradually rises. After each layer of feeding is completed, the punch 3 presses down to extrude the metal powder inside the cavity 201 into shape.

[0037] The amount of metal powder to be formed in one press is first fed into the inside of the punch head 3 in batches for heating, and then falls into the lower die cylinder 201 in sequence for unified pressing. Only a thin layer of metal powder is heated each time, which helps to avoid the temperature gradient of external heat and internal cold caused by the long heat conduction path in traditional heating. In addition, as the powder is shaken off the hot material block 502 and falls through each drop port 402, it is further mixed, which helps to make the temperature of each layer of powder uniform. Moreover, each layer of powder is in a loose and unpressurized state before falling into the die cylinder 201. The expansion gas generated by heating can be fully released during the falling process, avoiding the porosity and interlayer defects caused by the outer shell being dense first and the gas in the middle expanding later in the traditional process.

[0038] Please see Figure 6 , Figure 7 and Figure 9 As shown, the hot material block 502 includes a top tip and a bottom plane. The size of the bottom plane of the hot material block 502 is consistent with the size of the bottom opening of the sieve plate 401. When the fourth hydraulic rod 503 drives the connecting rod 501 and the hot material block 502 to descend, the bottom plane of the hot material block 502 just fills the inside of the sieve plate 401, sealing the sieve plate 401 and preventing powder from falling during the heating process. During the pressing process of the punch head 3, the bottom plane of the hot material block 502 and the bottom surface of the sieve plate 401 can jointly form an extrusion plane. The top tip of the hot material block 502 is provided above. When it descends for heating, it can form an uneven heat-conducting surface, which can increase the contact area between the hot material block 502 and the metal powder and improve the heating efficiency. When the hot material block 502 rises, its tip can minimize the residue of metal powder after heating, making the powder easy to fall.

[0039] Please see Figure 8 As shown, the hot material assembly 5 also includes a toggle block 505. The cross-sectional shape of the toggle block 505 is set as a triangle. The toggle block 505 is fixedly connected to the inner wall of the punch head 3. The toggle block 505 is used to toggle the hot material block 502 when it passes by, thereby making it easier to shake off the metal powder remaining above the connecting rod 501.

[0040] Please see Figure 9 As shown, the material discharge port 402 is shaped like an inverted cone, and the top openings of each material discharge port 402 are connected. The gap between each material discharge port 402 forms a sliding slope 403. The pointed sliding slope 403 helps to minimize powder residue.

[0041] As the punch head 3 rises with the material layer, its bottom surface radiates heat to continuously and dynamically insulate the accumulated lower layer of powder, effectively compensating for heat loss to the die wall. This maintains the powder inside the die cylinder 201 in a micro-gradient temperature field with higher temperatures at the top and lower temperatures at the bottom. During pressing, the upper layer of powder softens and densifies first due to its slightly higher temperature, forming a densification wave from top to bottom. This wave drives the residual expansion gas inside the powder downwards and ultimately discharges it through the pre-reserved gap at the bottom of the die cylinder 201. This timing match of heating from the top and pressing from the bottom, and gas flowing downwards, fundamentally avoids the defects of the outer shell densifying first and the gas being trapped in the traditional process. It significantly reduces the risk of forming pores, interlayers, and internal cracks. At the same time, due to the small and controllable temperature gradient, the density distribution of the pressed metal cake is more uniform, and the product deformation and cracking tendency are greatly reduced.

[0042] Please see Figure 1 and Figure 5 As shown, a support plate 6 is fixedly connected inside the housing 1. A first hydraulic rod 7 is installed on the bottom surface of the support plate 6. The output end of the first hydraulic rod 7 is fixedly connected to the punch head 3 and is used to control the lifting and lowering of the punch head 3.

[0043] Please see Figure 1 and Figure 2 As shown, the feeding assembly 8 includes a hopper 801, a feeding cylinder 803 is fixedly connected to the bottom of the hopper 801, a spiral screw 802 is installed between the hopper 801 and the feeding cylinder 803, an opening and closing valve plate is installed inside the feeding cylinder 803, and a feeding port matching the feeding cylinder 803 is opened at the top of the punch head 3 for feeding materials into the punch head 3 in batches.

[0044] Please see Figure 4 As shown, a lifting platform 202 is slidably connected inside the die cylinder 201. A second hydraulic rod 203 is installed at the bottom end of the lifting platform 202 and is fixedly connected to the inside of the housing 1. A pusher plate 204 is provided on the back of the die cylinder 201, and a third hydraulic rod 205 is installed on the back of the pusher plate 204. The third hydraulic rod 205 is fixedly connected to the housing 1. A discharge opening 206 is provided on the side of the die cylinder 201 away from the pusher plate 204, and a slide rail 207 is fixedly connected to the outside of the discharge opening 206.

[0045] Working principle: Powdered metal scrap to be extruded is stored inside the hopper 801. Through the rotation of the spiral screw 802, it is broken up and falls into the punch 3 via the feeding cylinder 803. At this time, the hot material assembly 5 is in a lowered state, and the bottom plane of the hot material block 502 blocks the inside of the discharge port 402. The metal powder falls onto the hot material block 502 and the top of the sieve plate 401. The punch 3 then descends and inserts into the die cylinder 201. Simultaneously, the hot material block 502 heats the metal powder covering its surface at a temperature between 400℃ and 600℃. After heating, the fourth hydraulic rod 503 drives the connecting rod 501 and each hot material block 502 to rise synchronously. The hot material block 502 is pulled out of the discharge port 402. 2 is in the open state. The powder that has been heated inside the punch head 3 can fall into the cavity 201 below through the discharge port 402. When the hot material block 502 passes the agitator block 505, it is affected by the agitator block 505. The connecting rod 501 and each hot material block 502 will shake, thereby shaking off the metal powder that was originally on the hot material block 502 and the connecting rod 501 and falling into the cavity 201. This completes the heating and laying of the first layer of metal powder inside the cavity 201. After the metal powder is heated, the internal path of the powder is short during the process of falling from the sieve plate 401 into the cavity 201 below. The expansion gas inside the powder is easy to be discharged. The cavity 201 is equipped with a heat preservation component to reduce the heat loss of the metal powder.

[0046] Next, the hot material block 502 descends to block the discharge port 402. The second batch of metal powder is then fed into the punch head 3 through the feeding cylinder 803 for heating, just like the first batch. After heating, it falls into the die cylinder 201. As the metal powder accumulates inside the die cylinder 201, the punch head 3 gradually rises. Each layer of metal powder is heated and accumulates inside the die cylinder 201 in sequence. After accumulating to a certain amount, the fourth hydraulic rod 503 drives the hot material block 502 to press tightly into the discharge port 402, keeping the bottom surface of the sieve plate 401 flush. At the same time, the first hydraulic rod 7 drives the punch head 3. The metal powder inside the die cylinder 201 is extruded and formed by lowering the die head 3. Since the lower metal powder is heated first and the upper metal powder is heated later, and the heat radiation from the bottom surface of the punch head 3 can still heat and keep the metal powder below it during the rising process, the metal powder inside the die cylinder 201 is in a state where the upper temperature is slightly higher than the lower temperature when the punch head 3 is pressed. During extrusion, the upper metal powder is formed more densely first, and the residual expansion gas in the powder is gradually squeezed downwards and can eventually be discharged downwards through the gap between the lifting platform 202 and the die cylinder 201.

[0047] After the metal powder is extruded into a cake shape, the top of the second hydraulic rod 203 drives the lifting platform 202 to descend to the bottom of the pusher plate 204, and the third hydraulic rod 205 drives the pusher plate 204 to push forward, discharging the cake-shaped metal waste outward through the discharge opening 206 and the slide 207.

[0048] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A metal scrap briquetting machine for industrial waste recycling, characterized in that, The device includes a housing, inside which a die assembly is installed. The die assembly includes a die cylinder fixedly connected to the inside of the housing, a punch inserted inside the die cylinder, a base plate assembly fixedly connected to the bottom end of the punch, a hot material assembly installed inside the punch, and a screen plate fixedly connected to the bottom of the punch, with several material discharge ports evenly spaced inside the screen plate. The hot material assembly includes a fourth hydraulic rod installed at the four corners of the punch, a spring fixedly connected to the bottom end of the fourth hydraulic rod, a connecting rod fixedly connected to the bottom end of the spring, and several hot material blocks evenly distributed at the bottom of the connecting rod, each hot material block corresponding to a material discharge port, and a heating mechanism installed inside each hot material block. The top of the punch is equipped with a feeding component. The metal powder inside the feeding component enters the punch in batches to be preheated. After each batch of metal powder is preheated, it falls into the die cylinder in layers. During the feeding process, the punch gradually rises. After each layer of material is fed, the punch presses down to compress the metal powder inside the die cylinder into shape.

2. The metal scrap briquetting machine for industrial waste recycling according to claim 1, characterized in that: The hot material block includes a top tip and a bottom plane, and the size of the bottom plane of the hot material block is consistent with the size of the opening at the bottom end of the sieve plate.

3. The metal scrap briquetting machine for industrial waste recycling according to claim 1, characterized in that: The hot material assembly also includes a deflector block with a triangular cross-sectional shape. The deflector block is fixedly connected to the inner wall of the punch head and is used to deflect the hot material block as it passes by.

4. The metal scrap briquetting machine for industrial waste recycling according to claim 1, characterized in that: The material discharge port is shaped like an inverted cone, with the top openings of each discharge port connected together, and the gap between each discharge port forming a material sliding slope.

5. The metal scrap briquetting machine for industrial waste recycling according to claim 1, characterized in that: A support plate is fixedly connected inside the housing, and a first hydraulic rod is installed on the bottom surface of the support plate. The output end of the first hydraulic rod is fixedly connected to the punch head.

6. The metal scrap briquetting machine for industrial waste recycling according to claim 1, characterized in that: The feeding assembly includes a hopper, a feeding cylinder is fixedly connected to the bottom of the hopper, a spiral screw is installed between the hopper and the feeding cylinder, an opening and closing valve plate is installed inside the feeding cylinder, and a feeding port matching the feeding cylinder is opened at the top of the punch head.

7. The metal scrap briquetting machine for industrial waste recycling according to claim 1, characterized in that: A lifting platform is slidably connected inside the concave mold cylinder. A second hydraulic rod is installed at the bottom end of the lifting platform and is fixedly connected to the inside of the machine housing.

8. The metal scrap briquetting machine for industrial waste recycling according to claim 7, characterized in that: The back of the die cylinder is provided with a pusher plate, and a third hydraulic rod is installed on the back of the pusher plate. The third hydraulic rod is fixedly connected to the machine housing.

9. The metal scrap briquetting machine for industrial waste recycling according to claim 7, characterized in that: The die cylinder has a discharge opening on the side away from the pusher plate, and a slide is fixedly connected to the outside of the discharge opening.

10. The briquetting method of the metal scrap briquetting machine for industrial waste recycling according to any one of claims 1-9, characterized in that: Includes the following steps: S1. The metal powder inside the hopper is fed into the inside of the punch in batches through the feeding cylinder. The metal powder falls onto the hot material block and the top of the sieve plate. The hot material block heats the metal powder covering its surface. S2. After heating is completed, the fourth hydraulic rod drives the connecting rod and each hot material block to rise synchronously. The hot material block is pulled out from the discharge port. At this time, the discharge port is in an open state. The powder that has been heated inside the punch falls into the cavity of the die below through the discharge port. When the hot material block passes the agitator, it is agitated by the agitator, and the connecting rod and each hot material block will shake. This shakes off the metal powder that was originally on the hot material block and the connecting rod and falls into the cavity of the die, completing the heating and laying of the first layer of metal powder inside the die. S3. The hot material block descends again to block the discharge port. The second batch of metal powder is fed into the punch again through the feeding cylinder for heating. Similar to the first batch of metal powder, after heating, it falls into the die cylinder. As the metal powder accumulates inside the die cylinder, the punch gradually rises. Each layer of metal powder is heated and accumulated inside the die cylinder in sequence. S4. After accumulating to a certain amount, the fourth hydraulic rod drives the hot material block to be tightly squeezed inside the discharge port, so that the bottom surface of the screen plate remains flat. At the same time, the first hydraulic rod drives the punch head to descend and extrude the metal powder inside the die cylinder. During extrusion, the upper metal powder is more compacted and formed first. The residual expansion gas in the powder is gradually squeezed downward and can eventually be discharged downward through the gap between the lifting platform and the die cylinder. S5. After the metal powder is extruded into a cake shape, the top of the second hydraulic rod drives the lifting platform to descend to the bottom of the pusher plate, and the third hydraulic rod drives the pusher plate to push forward, discharging the cake-shaped metal waste outward through the discharge opening and slide.

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