Iron-based powder compression molding mold convenient to demold

Abstract

The invention relates to the technical field of pressing molds, in particular to an iron-based powder pressing forming mold convenient to demold, which comprises a male mold, a female mold and a hydraulic cylinder, the hydraulic cylinder is fixedly connected with the male mold, the lower surface of the male mold is fixedly connected with a mold head, and the female mold is provided with a cavity; the female die is internally provided with a pressing mechanism, the pressing mechanism is composed of a pressure assembly and a monitoring assembly, the pressure assembly and the monitoring assembly are both arranged in the female die, the pressure assembly comprises a hollow die plate, the die plate is connected into the cavity in a sealed and sliding mode, and a pressure groove is formed in the female die; a main piston and an auxiliary piston are connected into the pressure groove in a sealed and sliding mode, the monitoring assembly comprises a cavity, and the cavity is formed in the bottom wall of the female die; and a coating mechanism is arranged in the female die. The mold has the advantages that the pressing quality can be guaranteed, meanwhile, automatic demolding and automatic demolding agent coating can be achieved, demolding is more convenient, the labor intensity is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressing dies, and in particular to an iron-based powder pressing and forming die which is easy to demould. Background Art

[0002] There are many ways to form objects, among which press forming is one of them. Press forming has a wide range of applications. The forming of some metal powders or plastics can be processed by press forming. During the pressing process, the powder particles will be subjected to pressure from the mold, causing plastic deformation and approaching each other, and finally forming a compact with a certain density and strength. In press forming, one of the final components is the mold. Metal powder is pressed in the mold cavity to form a compact of the desired shape. Therefore, the quality of the compact is directly determined by the mold. The mold material should have good wear resistance, heat resistance and dimensional stability to ensure the service life of the mold and the quality of the pressed product. After the press forming is completed, the compact is taken out of the cavity for subsequent processing.

[0003] In the prior art, during compression molding, pressure is generally applied through a male mold, that is, pressure is applied in only one direction. The application of pressure in one direction may cause uneven pressure on the green compact, thereby affecting the quality of the green compact. At the same time, in order to facilitate demolding of the green compact, before pressing, the processing personnel are required to spray a demolding agent in the cavity, which increases the processing steps and reduces the labor intensity and processing efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to provide an iron-based powder pressing and forming die which is easy to demould.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An iron-based powder pressing and forming die that is easy to demould comprises a male die, a female die and a hydraulic cylinder, wherein the hydraulic cylinder is fixedly connected to the male die, a die head is fixedly connected to the lower surface of the male die, and a cavity is formed in the female die; A pressing mechanism is arranged in the female mold, and the pressing mechanism is composed of a pressure component and a monitoring component. The pressure component and the monitoring component are both arranged in the female mold. The pressure component includes a hollow template, and the template is sealingly and slidably connected in the cavity. A pressure groove is opened in the female mold, and a main piston and a secondary piston are sealingly and slidably connected in the pressure groove. The monitoring component includes a cavity, and the cavity is opened in the bottom wall of the female mold; A coating mechanism is arranged in the female mold, and the coating mechanism includes a plurality of auxiliary sleeves, wherein the auxiliary sleeves are fixedly connected to the bottom wall of the cavity, the top wall of the auxiliary sleeve is sealed and slidably connected with a second tube, and one end of the second tube away from the auxiliary sleeve is fixedly connected to the bottom wall of the template and extends into the interior thereof.

[0006] Furthermore, the pressure assembly also includes a third spring, which is fixedly connected between the main piston and the auxiliary piston, and a plurality of first springs are fixedly connected between the lower surface of the template and the bottom wall of the cavity. The female mold is penetrated and fixedly connected with a main sleeve, and the main sleeve extends into the cavity. A main slide column is sealingly and slidably connected in the main sleeve, and the main slide column is fixedly connected to the lower surface of the template. The female mold and the main sleeve are jointly penetrated and fixedly connected with a first tube, one end of the first tube extends into the main sleeve, and the other end extends into the pressure groove, and a lower pressure column is sealingly and slidably connected in the pressure groove, and hydraulic oil is filled between the lower pressure column and the auxiliary piston, between the main piston and the first tube, and in the main sleeve.

[0007] Furthermore, the monitoring component also includes a magnetic column and a conductive coil, the magnetic column and the conductive coil are respectively fixedly connected to the side walls on the opposite side of the secondary piston and the main piston, the inner side wall of the cavity is fixedly connected to an electromagnet, both ends of the conductive coil are connected to the positive and negative poles of the electromagnet through wires, a slide plate is slidably connected in the cavity, the slide plate is slidably connected with multiple slide columns, both ends of the slide column are commonly fixedly connected to a trigger plate, the side wall of the trigger plate close to the electromagnet is fixedly connected to a permanent magnet block, the side wall of the slide plate close to the electromagnet is fixedly connected to a switch, the upper surface of the male mold is fixedly connected to an indicator light, and the switch and the indicator light are electrically connected through a wire.

[0008] Furthermore, the coating mechanism also includes a plurality of pump blocks, the pump blocks are sealingly and slidably connected in the corresponding auxiliary sleeves, one end of the second tube located in the auxiliary sleeve is fixedly connected to the upper surface of the pump block, a plurality of third tubes are passed through and fixedly connected to the side wall of the second tube, a plurality of fourth tubes are passed through and fixedly connected to the pump block, a plurality of liquid storage cavities and replenishing holes are provided in the female mold, the replenishing holes connect the corresponding liquid storage cavities with the outside, the female mold and the auxiliary sleeve are jointly passed through and fixedly connected with a fifth tube, the fifth tube connects the corresponding auxiliary sleeve with the liquid storage cavity, the side walls of the template are provided with strip holes, and the liquid storage cavity is filled with a release agent.

[0009] Furthermore, one-way valves are provided in the third tube, the fourth tube and the fifth tube.

[0010] Furthermore, the female mold is provided with a groove, the pressure groove is communicated with the groove, one end of the lower pressure column located outside the pressure groove is fixedly connected to a fixing plate, and a plurality of second springs are fixedly connected between the fixing plate and the inner bottom wall of the groove.

[0011] Furthermore, the female mold is provided with a through hole, which penetrates the pressure groove and connects the cavity with the outside.

[0012] Furthermore, a plurality of guide posts are fixedly connected to the upper surface of the female mold, and the guide posts are slidably connected to the male mold.

[0013] Furthermore, the trigger plate, slide plate, slide column, main piston and auxiliary piston are all made of aluminum alloy.

[0014] Furthermore, a limiting ring is fixedly connected in the pressure groove.

[0015] The present invention has the following advantages: 1. During the pressing process of the male mold and the female mold, while the male mold drives the die head into the cavity to apply pressure from top to bottom, the male mold also causes the lower pressure column to slide down, and the pressure is transmitted through the hydraulic oil, so that the pressure is also applied from bottom to top through the template. By applying pressure in two relative directions, the pressed blank is pressed more evenly; 2. During the pressure holding process after mold closing, the pressure is monitored through the magnetic column and the conductive coil. When the mold is damaged during use, resulting in insufficient sealing, the pressure will drop, causing the main piston and the auxiliary piston to move relative to each other. At this time, the magnetic column slides to the outside of the conductive coil, thereby energizing the electromagnet, triggering the switch, and lighting the indicator light. When the indicator light is on during the pressure holding process, it means that there is insufficient sealing, which requires timely maintenance to avoid the production of batch defective products due to insufficient pressure; 3. During the pressing process, the template slides down, and the pump block is driven down by the second tube to replenish the release agent to the top of the pump block. After the pressing is completed, when the template slides up under the elastic force of the first spring, the pump block slides up, and the release agent is coated on the inner wall of the cavity through the third tube, the second tube and the strip hole, thereby completing the automatic coating of the release agent, avoiding the need for manual coating every time pressing, greatly reducing labor intensity and improving processing efficiency; 4. The template slides down during pressing, and after pressing is completed, the template will slide up under the elastic force of the first spring, lifting the pressed blank out of the cavity, thereby completing automatic demoulding without the need for subsequent manual demoulding, greatly improving the degree of automation; 5. When the template slides up for automatic demoulding, the magnetic column will slide to the outside of the conductive coil accordingly. The movement of the magnetic column will be subject to a certain resistance, which changes with the change of movement speed, so that when the template slides up, it will slide up slowly to avoid the demoulding speed being too fast, which will cause damage to the edge of the pressed billet and ensure the demoulding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an iron-based powder pressing and forming die that is easy to demould, as proposed by the present invention; Figure 2 A schematic diagram of the internal structure of a longitudinal section of an iron-based powder pressing mold for easy demoulding proposed by the present invention; Figure 3 for Figure 2 A in the enlarged view; Figure 4 for Figure 2 The enlarged view of point B in the figure; Figure 5 This is a schematic diagram of the internal structure of another longitudinal section of an iron-based powder pressing and forming die for easy demoulding proposed by the present invention; Figure 6 for Figure 5 The enlarged view of point C in the figure; Figure 7 A schematic diagram of the internal structure of a cross-section of an iron-based powder pressing mold that is easy to demould provided by the present invention; Figure 8 The present invention provides a schematic structural diagram of a template in an iron-based powder pressing and forming die that is easy to demould.

[0017] In the figure: 1, male mold; 2, female mold; 3, hydraulic cylinder; 4, die head; 5, cavity; 6, template; 7, first spring; 8, main slide; 9, main slide column; 10, pressure groove; 11, first tube; 12, lower pressure column; 13, groove; 14, fixed plate; 15, second spring; 16, main piston; 17, auxiliary piston; 18, third spring; 19, limit ring; 20, magnetic column; 21, conductive coil; 22, cavity; 23, electromagnet; 24, slide plate; 25, slide bar; 26, trigger plate; 27, permanent magnet block; 28, switch; 29, indicator light; 30, through hole; 31, guide column; 32, auxiliary slide; 33, second tube; 34, pump block; 35, third tube; 36, fourth tube; 37, liquid storage cavity; 38, fifth tube; 39, supplementary hole; 40, strip hole. DETAILED DESCRIPTION

[0018] Reference Figure 1-8 , an iron-based powder pressing and forming mold for easy demoulding, comprising a male mold 1, a female mold 2 and a hydraulic cylinder 3, the hydraulic cylinder 3 is fixedly connected to the male mold 1, a die head 4 is fixedly connected to the lower surface of the male mold 1, and a cavity 5 is opened in the female mold 2; A pressing mechanism is arranged in the female mold 2, and the pressing mechanism is composed of a pressure component and a monitoring component. Both the pressure component and the monitoring component are arranged in the female mold 2. The pressure component includes a hollow template 6, and the template 6 is sealingly and slidably connected in the cavity 5. A pressure groove 10 is opened in the female mold 2, and a main piston 16 and a secondary piston 17 are sealed and slidably connected in the pressure groove 10. The monitoring component includes a cavity 22, and the cavity 22 is opened in the bottom wall of the female mold 2; A coating mechanism is arranged in the female mold 2, and the coating mechanism includes a plurality of auxiliary sleeves 32, the auxiliary sleeves 32 are fixedly connected to the bottom wall of the cavity 5, the top wall of the auxiliary sleeve 32 is sealed and slidably connected with a second tube 33, and one end of the second tube 33 away from the auxiliary sleeve 32 is fixedly connected to the bottom wall of the template 6 and extends into the interior thereof.

[0019] The pressure assembly also includes a third spring 18, which is fixedly connected between the main piston 16 and the auxiliary piston 17. A plurality of first springs 7 are fixedly connected between the lower surface of the template 6 and the inner bottom wall of the cavity 5. The female mold 2 is penetrated and fixedly connected with a main sleeve 8, which extends through the cavity 5. A main slide column 9 is sealed and slidably connected in the main sleeve 8. The main slide column 9 is fixedly connected to the lower surface of the template 6. The female mold 2 and the main sleeve 8 are penetrated and fixedly connected with a first tube 11. One end of the first tube 11 extends through the main sleeve 8, and the other end extends through the pressure groove 10. A lower pressure column 12 is sealed and slidably connected in the pressure groove 10. The space between the lower pressure column 12 and the auxiliary piston 17, between the main piston 16 and the first tube 11, and in the main sleeve 8 are filled with hydraulic Oil, the male mold 1 descends, and the die head 4 contacts the iron-based powder, and the powder and the template 6 move into the cavity 5, driving the lower pressure column 12 to move into the pressure groove 10. After the pressure applied by the male mold 1 contacts the powder, it applies a top-down pressure on the lower pressure column 12, and the lower pressure column 12 transmits the pressure to the main slide column 9 through the hydraulic oil, in conjunction with the auxiliary piston 17, the third spring 18, and the main piston 16. The main slide column 9 applies a bottom-up pressure to the powder through the template 6, and the powder is pressed into shape by applying pressure in two relative directions. Pressing and molding by applying pressure in two relative directions can effectively ensure that the pressed blank is evenly pressed, avoid the situation where uneven force is caused by unidirectional pressure, and thus ensure the pressing quality.

[0020] The monitoring component also includes a magnetic column 20 and a conductive coil 21. The magnetic column 20 and the conductive coil 21 are respectively fixedly connected to the side wall on the opposite side of the secondary piston 17 and the main piston 16. The inner wall of the cavity 22 is fixedly connected to an electromagnet 23. The two ends of the conductive coil 21 are connected to the positive and negative poles of the electromagnet 23 through a wire. When the magnetic column 20 slides into the conductive coil 21 or slides from the inside to the outside, an induced current will be generated in the conductive coil 21 to prevent the magnetic column 20 from sliding. A slide plate 24 is slidably connected in the cavity 22. The slide plate 24 is slidably connected to multiple slide rods 25. The slide rods The two ends of the slide plate 25 are fixedly connected with a trigger plate 26, and the side wall of the trigger plate 26 close to the electromagnet 23 is fixedly connected with a permanent magnet block 27. When the magnetic column 20 slides into the conductive coil 21, the generated induced current is supplied to the electromagnet 23, and the electromagnet 23 generates a magnetic attraction force on the permanent magnet block 27. When the magnetic column 20 slides outside the conductive coil 21, the generated induced current is supplied to the electromagnet 23, and the electromagnet 23 generates a magnetic repulsion force on the permanent magnet block 27. The side wall of the slide plate 24 close to the electromagnet 23 is fixedly connected with a switch 28. The switch 28 is electrically connected to the indicator light 29 through a wire. When the switch 28 is pressed, the indicator light 29 is powered on and lit. When the switch 28 is released, the indicator light 29 is powered off and extinguished. During the pressure holding process, if the mold is well sealed, the pressure in the cavity 5 will not change significantly. At this time, the distance between the main piston 16 and the auxiliary piston 17 will not change significantly. If the mold is not well sealed, the powder will be pressed out of the mold through the gap, thereby significantly reducing the pressure in the cavity 5. The reduction in pressure will cause the main piston 16 and the auxiliary piston 17 to move away from each other. Relative movement occurs between them. At this time, the magnetic column 20 will obviously slide to the outside of the conductive coil 21, so that sufficient induced current is generated in the conductive coil 21 and supplied to the electromagnet 23, so that the electromagnet 23 generates sufficient magnetic repulsion on the permanent magnet block 27, so that the permanent magnet block 27 drives the trigger plate 26 to press the switch 28, so that the indicator light 29 lights up. When the indicator light 29 is on during the pressure holding process, it means that there is an obvious leakage in the mold, and it is necessary to stop the machine for inspection and maintenance in time to avoid continuous production due to leakage in the mold, resulting in the production of batch defective products and ensuring production quality.

[0021] It is worth mentioning that during the demolding process, the template 6 and the lower pressure column 12 slide up, which will cause the main piston 16 and the auxiliary piston 17 to move in opposite directions, thereby causing the magnetic column 20 to slide toward the outside of the conductive coil 21. At this time, an induced current will be generated in the conductive coil 21, and the magnetic column 20 will be subject to a certain resistance. The magnitude of the resistance is related to the speed of movement of the template 6. The faster the movement speed, the greater the resistance, thereby causing the template 6 to slide up slowly, avoiding the template 6 from sliding up and demolding too quickly, resulting in damage to the side wall of the blank, thereby ensuring the demolding quality.

[0022] The coating mechanism also includes a plurality of pump blocks 34 (such as Figure 6As shown in the figure, the pump block 34 is sealingly and slidably connected in the corresponding auxiliary sleeve 32, one end of the second tube 33 located in the auxiliary sleeve 32 is fixedly connected to the upper surface of the pump block 34, a plurality of third tubes 35 are fixedly connected through the side wall of the second tube 33, a plurality of fourth tubes 36 are fixedly connected through the pump block 34, a plurality of liquid storage chambers 37 and replenishing holes 39 are provided in the female mold 2, the replenishing holes 39 connect the corresponding liquid storage chamber 37 with the outside, the female mold 2 and the auxiliary sleeve 32 are jointly penetrated and fixedly connected with a fifth tube 38, the fifth tube 38 connects the corresponding auxiliary sleeve 32 with the liquid storage chamber 37, one end of the fifth tube 38 located in the liquid storage chamber 37 is close to the inner bottom wall of the liquid storage chamber 37, so as to ensure that the release agent in the liquid storage chamber 37 can be stably extracted, and the side walls of the template 6 are provided with strip holes 40 (as shown in the figure Figure 8 As shown, the liquid storage chamber 37 is filled with a release agent. When the template 6 moves downward, it will also drive the pump block 34 to slide down through the second tube 33. The pump block 34 slides down, and the release agent below the pump block 34 will enter the top of the pump block 34 through the fourth tube 36, waiting to be pumped out. When the template 6 slides up, it will also drive the pump block 34 to move upward through the second tube 33. The upward movement of the pump block 34 will pump the release agent above the pump block 34 into the template 6 through the third tube 35 and the second tube 33, and pump it out through the strip holes 40 on the side wall of the template 6. Through the movement of the template 6, the release agent is automatically and evenly coated on the inner wall of the cavity 5, so that in the process of demolding, the coating of the release agent is automatically completed, avoiding manual coating before each pressing, greatly reducing labor intensity, and improving processing efficiency.

[0023] One-way valves are provided in the third tube 35, the fourth tube 36 and the fifth tube 38. The one-way valve in the third tube 35 only allows the release agent to enter the second tube 33 from the auxiliary sleeve 32, the one-way valve in the fourth tube 36 only allows the release agent to enter the upper part of the pump block 34 from the bottom of the pump block 34, and the one-way valve in the fifth tube 38 only allows the release agent to enter the auxiliary sleeve 32 from the liquid storage chamber 37.

[0024] The female mold 2 is provided with a groove 13 , the pressure groove 10 is connected to the groove 13 , one end of the lower pressure column 12 outside the pressure groove 10 is fixedly connected to a fixing plate 14 , and a plurality of second springs 15 are fixedly connected between the fixing plate 14 and the inner bottom wall of the groove 13 .

[0025] The female mold 2 is provided with a through hole 30, which penetrates the pressure groove 10 and connects the cavity 5 with the outside (such as Figure 2 and Figure 3 As shown in the figure, the through hole 30 connects the portion between the main piston 16 and the auxiliary piston 17 and the cavity 5 with the outside world, thereby ensuring that the sealed and sliding main piston 16, the auxiliary piston 17 and the template 6 can slide freely.

[0026] A plurality of guide posts 31 are fixedly connected to the upper surface of the female mold 2. The guide posts 31 penetrate and are slidably connected to the male mold 1. The arrangement of the guide posts 31 allows the male mold 1 to slide down smoothly and ensures smooth mold closing.

[0027] The trigger plate 26, the slide plate 24, the slide rod 25, the main piston 16, and the auxiliary piston 17 are all made of aluminum alloy. The trigger plate 26, the slide plate 24, and the slide rod 25 made of aluminum alloy can avoid affecting the magnetic force of the electromagnet 23, and the main piston 16 and the auxiliary piston 17 made of aluminum alloy can avoid affecting the magnetic force of the magnetic column 20.

[0028] A limit ring 19 is fixedly connected in the pressure groove 10 , and the limit ring 19 is used to limit the movement of the auxiliary piston 17 to prevent the auxiliary piston 17 from excessively sliding and getting stuck in the arc-shaped part of the pressure groove 10 .

[0029] In the present invention, a certain amount of iron-based powder is placed above the template 6, and the hydraulic cylinder 3 is turned on to make the male mold 1 descend, and the die head 4 contacts the iron-based powder, and the powder and the template 6 move into the cavity 5, and then the male mold 1 contacts the fixed plate 14, and drives the lower pressure column 12 to move into the pressure groove 10 through the fixed plate 14. After the pressure applied by the male mold 1 contacts the powder, it applies top-down pressure and contacts the fixed plate 14 at the same time, applying pressure on the lower pressure column 12. The lower pressure column 12 is transmitted to the main slide column 9 through the hydraulic oil and cooperates with the auxiliary piston 17, the third spring 18, and the main piston 16. The main slide column 9 applies bottom-up pressure to the powder through the template 6. The powder is pressed into shape by applying pressure in two relative directions. After the male mold 1 and the female mold 2 are closed, the pressure is maintained for a certain time.

[0030] During the mold closing process, the main piston 16 and the auxiliary piston 17 will move relative to each other, compressing the third spring 18 and causing the magnetic column 20 to slide into the conductive coil 21, thereby generating an induced current in the conductive coil 21. After being supplied to the electromagnet 23, the electromagnet 23 generates a magnetic attraction force on the permanent magnet block 27, and the permanent magnet block 27 contacts the electromagnet 23. At the same time, the permanent magnet block 27 drives the trigger plate 26 to move toward the electromagnet 23.

[0031] When the template 6 moves downward, it will also drive the pump block 34 to slide down through the second tube 33. When the pump block 34 slides down, the release agent below the pump block 34 will enter the top of the pump block 34 through the fourth tube 36 and wait to be pumped out.

[0032] During the pressure holding process, if the mold is well sealed, the pressure in the cavity 5 will not change significantly, and the distance between the main piston 16 and the auxiliary piston 17 will not change significantly. If the mold is not well sealed, the powder will be pressed out of the mold through the gap, thereby significantly reducing the pressure in the cavity 5. The reduction in pressure will cause relative movement between the main piston 16 and the auxiliary piston 17. At this time, the magnetic column 20 will obviously slide to the outside of the conductive coil 21, thereby generating sufficient induced current in the conductive coil 21 and supplying it to the electromagnet 23, so that the electromagnet 23 generates sufficient magnetic repulsion on the permanent magnet block 27, so that the permanent magnet block 27 drives the trigger plate 26 to press the switch 28, thereby lighting the indicator light 29. When the indicator light 29 is on during the pressure holding process, it means that there is an obvious leakage in the mold and it is necessary to shut down and repair it in time.

[0033] After the pressure holding is completed, the hydraulic cylinder 3 is operated to separate the male mold 1 from the female mold 2. At this time, under the elastic force of the first spring 7 and the second spring 15, the template 6 and the lower pressure column 12 slide up and reset. The template 6 slides up and lifts the pressed blank above it out of the cavity 5, thereby completing automatic demolding.

[0034] While the template 6 slides upward, it will also drive the pump block 34 to move upward through the second tube 33. The upward movement of the pump block 34 will pump the release agent above the pump block 34 into the template 6 through the third tube 35 and the second tube 33, and pump it out through the strip holes 40 on the side wall of the template 6. Through the movement of the template 6, the release agent is automatically and evenly coated on the inner wall of the cavity 5.

[0035] On the other hand, the upward sliding of the pump block 34 will also suck the release agent in the liquid storage chamber 37 into the auxiliary sleeve 32 through the fifth tube 38 to replenish the release agent in the auxiliary sleeve 32. After the mold has been used for a certain period of time, the release agent can be replenished in the liquid storage chamber 37 through the replenishment hole 39.

Claims

1. A mold for pressing and forming iron-based powders that is easy to demould, comprising a male mold (1), a female mold (2) and a hydraulic cylinder (3), wherein the hydraulic cylinder (3) is fixedly connected to the male mold (1), and is characterized in that: The lower surface of the male mold (1) is fixedly connected to a mold head (4), and the female mold (2) is provided with a mold cavity (5); A pressing mechanism is arranged in the female mold (2), the pressing mechanism comprising a pressure component and a monitoring component, the pressure component and the monitoring component are both arranged in the female mold (2), the pressure component comprises a hollow template (6), the template (6) is sealingly and slidably connected in the cavity (5), a pressure groove (10) is provided in the female mold (2), a main piston (16) and a secondary piston (17) are sealingly and slidably connected in the pressure groove (10), and the monitoring component comprises a cavity (22), and the cavity (22) is provided in the bottom wall of the female mold (2); A coating mechanism is provided in the female mold (2), the coating mechanism comprising a plurality of auxiliary sleeves (32), the auxiliary sleeves (32) being fixedly connected to the inner bottom wall of the cavity (5), the top wall of the auxiliary sleeve (32) being sealed and slidably connected with a second tube (33), the end of the second tube (33) away from the auxiliary sleeve (32) being fixedly connected to the bottom wall of the template (6) and extending into the interior thereof.

2. The iron-based powder pressing and forming die for easy demoulding according to claim 1, characterized in that: The pressure assembly further comprises a third spring (18), wherein the third spring (18) is fixedly connected between the main piston (16) and the auxiliary piston (17), a plurality of first springs (7) are fixedly connected between the lower surface of the template (6) and the inner bottom wall of the cavity (5), a main sliding sleeve (8) is fixedly connected through the female mold (2), the main sliding sleeve (8) extends through the cavity (5), a main sliding column (9) is sealingly and slidably connected in the main sliding sleeve (8), and the main sliding column (9) is connected to the template ( 6) The lower surface is fixedly connected, the female mold (2) and the main sliding sleeve (8) are jointly penetrated and fixedly connected with a first tube (11), one end of the first tube (11) extends through the main sliding sleeve (8), and the other end extends through the pressure groove (10), and the pressure groove (10) is sealed and slidably connected with a lower pressure column (12), and the space between the lower pressure column (12) and the auxiliary piston (17), between the main piston (16) and the first tube (11), and the main sliding sleeve (8) are filled with hydraulic oil.

3. The iron-based powder pressing and forming die for easy demoulding according to claim 1, characterized in that: The monitoring assembly further comprises a magnetic column (20) and a conductive coil (21). The magnetic column (20) and the conductive coil (21) are respectively fixedly connected to the side wall of the secondary piston (17) and the main piston (16) on the side opposite to each other. An electromagnet (23) is fixedly connected to the inner side wall of the cavity (22). Two ends of the conductive coil (21) are connected to the positive and negative poles of the electromagnet (23) through a wire. A slide plate (24) is slidably connected in the cavity (22). A plurality of slide bars (25) are slidably connected to the slide plate (24). Both ends of the slide bars (25) are commonly fixedly connected to a trigger plate (26). A permanent magnet block (27) is fixedly connected to the side wall of the trigger plate (26) on the side close to the electromagnet (23). A switch (28) is fixedly connected to the side wall of the slide plate (24) on the side close to the electromagnet (23). An indicator light (29) is fixedly connected to the upper surface of the male mold (1). The switch (28) and the indicator light (29) are electrically connected through a wire.

4. The iron-based powder pressing and forming die for easy demoulding according to claim 1, characterized in that: The coating mechanism further comprises a plurality of pump blocks (34), the pump blocks (34) being sealingly and slidably connected in the corresponding auxiliary sleeves (32); one end of the second tube (33) located in the auxiliary sleeve (32) is fixedly connected to the upper surface of the pump block (34); a plurality of third tubes (35) are penetrated and fixedly connected to the side wall of the second tube (33); a plurality of fourth tubes (36) are penetrated and fixedly connected to the pump block (34); a plurality of liquid storage cavities (37) and replenishing holes (39) are provided in the female mold (2); the replenishing holes (39) connect the corresponding liquid storage cavities (37) with the outside; a fifth tube (38) is penetrated and fixedly connected between the female mold (2) and the auxiliary sleeve (32); the fifth tube (38) connects the corresponding auxiliary sleeve (32) with the liquid storage cavity (37); the side walls of the template (6) are all provided with strip holes (40); the liquid storage cavity (37) is filled with a release agent.

5. The iron-based powder pressing and forming die for easy demoulding according to claim 4, characterized in that: The third tube (35), the fourth tube (36) and the fifth tube (38) are all provided with a one-way valve.

6. The iron-based powder pressing and forming die for easy demoulding according to claim 2, characterized in that: The female mold (2) is provided with a groove (13), the pressure groove (10) is connected to the groove (13), one end of the lower pressure column (12) located outside the pressure groove (10) is fixedly connected to a fixing plate (14), and a plurality of second springs (15) are fixedly connected between the fixing plate (14) and the inner bottom wall of the groove (13).

7. The iron-based powder pressing and forming die for easy demoulding according to claim 2, characterized in that: The female mold (2) is provided with a through hole (30), and the through hole (30) penetrates the pressure groove (10) and connects the mold cavity (5) with the outside.

8. The iron-based powder pressing and forming die for easy demoulding according to claim 1, characterized in that: A plurality of guide posts (31) are fixedly connected to the upper surface of the female mold (2), and the guide posts (31) are slidably connected to the male mold (1).

9. The iron-based powder pressing and forming die for easy demoulding according to claim 3, characterized in that: The trigger plate (26), the slide plate (24), the slide rod (25), the main piston (16), and the auxiliary piston (17) are all made of aluminum alloy.

10. The iron-based powder pressing and forming die that is easy to demould according to claim 3, characterized in that: A limiting ring (19) is fixedly connected inside the pressure groove (10).

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