A powder metallurgy mold

Abstract

The present invention discloses a powder metallurgy mold, which includes a base body. A die core is arranged on the base body, and a cavity is arranged in the die core. An adjusting plate is arranged above the base body, and a slot corresponding to the cavity is arranged on the adjusting plate. A height adjusting mechanism and a locking mechanism are arranged between the adjusting plate and the base body. The height adjusting mechanism includes a second threaded hole arranged on the adjusting plate and an adjusting screw connected to the second threaded hole. The lower end of the adjusting screw abuts against the base body. The locking mechanism includes a countersunk head hole arranged on the adjusting plate and a first threaded hole arranged on the base body corresponding to the countersunk head hole. A locking screw passes through the countersunk head hole and is connected to the first threaded hole. When in use, when the loose packing density of the powder raw material changes, the depth of the cavity of the mold can be adjusted according to actual needs, avoiding trimming or replacing the mold, and greatly reducing the cost.

Description

Technical Field

[0001] The present invention relates to a mold, and particularly to a powder metallurgy mold. Background Art

[0002] Powder metallurgy technology is a manufacturing technology that uses metal powder or a mixture of metal powder and non-metal powder as raw materials, and forms products through pressing and sintering. First, the powder raw materials need to be placed in the cavity of the mold, and the powder raw materials are flush with the upper end surface of the cavity. Then, the powder raw materials in the cavity are pressed and formed by a stamping device. After the powder raw materials are pressed, they are consolidated to form a blank, and then the blank is placed at a high temperature for sintering to form the required product.

[0003] When pressing the powder raw materials, the depth of the cavity of the mold needs to be determined according to the loose packing density of the powder raw materials. The greater the loose packing density of the powder raw materials, the larger the volume of the powder raw materials required to manufacture the same part, and the corresponding cavity depth is also larger; conversely, the greater the loose packing density of the powder raw materials, the larger the volume of the powder raw materials required to manufacture the same part, and the corresponding cavity depth is also smaller. When the loose packing density of the powder material changes due to the influence of the environment and process, it is necessary to increase or decrease the depth of the cavity to meet the compression ratio of the product. When the loose packing density of the powder raw materials changes due to the influence of the environment and process, it is necessary to increase or decrease the depth of the cavity to meet the compression ratio of the product. However, the traditional mold cannot adjust the depth of the cavity according to actual needs. Therefore, once the loose packing density of the powder raw materials changes, only the mold can be repaired or replaced, resulting in a large cost.

[0004] For example: Chinese Patent Publication No. CN103008655B, the invention title is a powder metallurgy mold, including a male mold and a female mold. The female mold includes a female mold outer sleeve and a female mold core. The female mold outer sleeve is sleeved on the female mold core to form an integral structure. A spiral oil groove is opened at the annular inner surface of the female mold outer sleeve. The spiral oil groove forms a hot oil circuit with an externally connected controllable temperature hot oil. A support device is provided between the male mold and the female mold. In this invention, when the depth of the cavity of the mold is fixed, it cannot be adjusted according to actual needs. Once the loose packing density of the powder raw materials changes, only the mold can be repaired or replaced, resulting in a large cost. Summary of the Invention

[0005] The object of the present invention is to solve the problem that the traditional mold cannot adjust the depth of the cavity according to actual needs. Once the loose packing density of the powder raw materials changes, only the mold can be repaired or replaced, resulting in a large cost, and to provide a powder metallurgy mold that can effectively solve the above problems.

[0006] The object of the present invention is achieved by the following technical solutions: A powder metallurgy mold includes a base body, a die core is arranged on the base body, a cavity is arranged in the die core, an adjusting plate is arranged above the base body, a slot corresponding to the cavity is arranged on the adjusting plate, a height adjusting mechanism and a locking mechanism are arranged between the adjusting plate and the base body, the height adjusting mechanism includes a second threaded hole arranged on the adjusting plate and an adjusting screw connected to the second threaded hole, and the lower end of the adjusting screw abuts against the base body; the locking mechanism includes a countersunk head hole arranged on the adjusting plate and a first threaded hole arranged on the base body corresponding to the countersunk head hole, and a locking screw passes through the countersunk head hole and is connected to the first threaded hole.

[0007] In the present invention, the distance between the upper surface of the adjusting plate and the bottom of the cavity is the actual depth of the cavity. In the present invention, the actual depth of the cavity can be adjusted by changing the distance between the adjusting plate and the base body. During adjustment, first loosen the locking screw, and then rotate the adjusting screw to adjust the height between the adjusting plate and the base body. When the adjusting plate is adjusted to the required height, then tighten the locking screw to lock the adjusting plate. When the present invention is in use, when the loose packing density of the powder raw material changes, the depth of the cavity of the mold can be adjusted according to actual needs, avoiding trimming or replacing the mold, and greatly reducing the cost.

[0008] Preferably, the base body is made of die steel.

[0009] Preferably, the die core is made of tungsten steel.

[0010] Preferably, a first guiding hole is arranged on the base body, a second guiding hole corresponding to the first guiding hole is arranged on the adjusting plate, and a guiding pin is arranged between the adjusting plate and the base body, and the guiding pin is connected to both the first guiding hole and the second guiding hole at the same time. The guiding pin plays a guiding role in the relative movement between the adjusting plate and the base body.

[0011] Preferably, a boss is arranged at the upper end of the base body, a groove matched with the boss is arranged on the side of the adjusting plate facing the base body, and the boss is slidably connected in the groove. The side surface of the boss contacts the side wall of the groove, and a mating surface is formed between the two, which plays a guiding role in the up and down movement of the adjusting plate.

[0012] Preferably, a sliding cavity is provided on the base, a screw connection block which can slide up and down is provided in the sliding cavity, and the first threaded hole is provided on the screw connection block; a cylinder body is provided at the bottom of the sliding cavity, a through hole is provided at the upper end of the cylinder body, a second piston is provided in the cylinder body, a second cavity is formed between the second piston and the upper end of the cylinder body, and a spring is provided between the second piston and the upper end of the cylinder body; a telescopic rod is connected to the second piston, the telescopic rod passes through the through hole, and the upper end of the telescopic rod is connected to the screw connection block; an annular cavity is provided in the base, and the annular cavity passes through the upper end surface of the base , an annular cavity is arranged around the outside of the cavity; a sliding ring that can slide up and down is arranged in the annular cavity, and the upper end of the sliding ring is in contact with the lower surface of the adjustment plate; an elastic component is arranged between the lower end of the sliding ring and the bottom of the annular cavity; a piston cavity is arranged horizontally on the outside of the annular cavity, and a first piston is arranged in the piston cavity, and a first cavity is formed between the first piston and the bottom of the piston cavity, and a push rod is connected to the first piston, and the push rod is directly opposite to the outer side of the sliding ring; the first cavity and the second cavity are connected by a connecting pipe; the first cavity and the second cavity are both filled with liquid medium. The cross-section of the screw connection block and the sliding cavity are both rectangular. When the locking screw is in a tightening state, the screw connection block moves to the uppermost position of the sliding cavity. At this time, the second piston is in the upper limit position, the volume of the second cavity is in the minimum state, the volume of the first cavity is in the maximum state, and the push rod is in the longest extension state. At this time, the push rod firmly presses the sliding ring. On the one hand, the sliding ring can support the adjustment plate, and on the other hand, the sliding ring can block the powder raw material to prevent the powder raw material from entering the mating surface between the adjustment plate and the base body and causing wear of the mating surface. When adjusting the height of the adjusting plate, it is necessary to loosen the locking screw first. When the locking screw is loosened, the screw connecting block will move downward a certain distance in the sliding cavity. During this process, the volume of the second cavity will increase, and the liquid medium in the first cavity will partially flow back into the second cavity, causing the push rod to retract a certain distance, and the tightening force of the push rod on the sliding ring disappears, thereby loosening the sliding ring. At this time, under the action of the elastic component, the upper end of the sliding ring always presses against the lower surface of the adjusting plate, and the sliding ring moves with the up and down movement of the adjusting plate; when the adjusting plate is adjusted to the desired position, the locking screw is tightened again. In the process of tightening the locking screw, the screw connecting block moves to the uppermost end of the sliding cavity under the action of the locking screw, and the screw connecting block drives the second piston to move upward, so that the liquid medium in the second cavity flows into the first cavity through the connecting pipe, so that the push rod tightens the sliding ring.

[0013] Preferably, the liquid medium is hydraulic oil.

[0014] Preferably, the elastic component is made of spring steel and has a "C"-shaped plate structure. The upper end of the elastic component is connected to the sliding ring, and the lower end is in contact with the bottom of the annular cavity.

[0015] The beneficial effects of the present invention are as follows: When in use, when the bulk density of the powder raw material changes, the cavity depth of the mold can be adjusted according to actual needs, avoiding the need to repair or replace the mold, and greatly reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the present invention.

[0017] Figure 2 It is a top view of the screw connection block.

[0018] Figure 3 It is Figure 1 The enlarged view of part A in

[0019] Figure 4 It is Figure 1 The enlarged view of part B in

[0020] Figure 5 It is a structural schematic diagram of the sliding ring.

[0021] In the figure: 1, matrix; 2, die core; 3, adjusting plate; 4, guide pin; 5, counterbore; 6, adjusting screw; 7, locking screw; 8, counterbore hole; 9, sliding cavity; 10, screw connection block; 12, connecting pipe; 13, first threaded hole; 14, annular cavity; 15, sliding ring; 16, elastic component; 17, first piston; 18, ejector rod; 19, first cavity; 20, cylinder block; 21, second piston; 22, spring; 23, second cavity; 24, telescopic rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described below through specific embodiments in conjunction with the drawings.

[0023] Embodiment 1:

[0024] As Figures 1 to 5 shown, a powder metallurgy mold includes a matrix 1 and an adjusting plate 3. The matrix 1 is made of die steel. A die core 2 is arranged on the matrix 1, and the die core 2 is made of tungsten steel. A cavity is arranged in the die core 2, and the upper end of the cavity is open. The adjusting plate 3 is arranged above the matrix 1. A slot corresponding to the cavity is arranged on the adjusting plate 3. A boss is arranged at the upper end of the matrix 1, and a groove matching the boss is arranged on the side of the adjusting plate 3 facing the matrix 1. The boss is slidably connected in the groove. The side surface of the boss contacts the side wall of the groove, and a mating surface is formed between the two, which plays a guiding role in the up and down movement of the adjusting plate. A first guiding hole is arranged on the matrix 1, and a second guiding hole corresponding to the first guiding hole is arranged on the adjusting plate 3. A guide pin 4 is arranged between the adjusting plate 3 and the matrix 1, and the guide pin 4 is simultaneously connected in the first guiding hole and the second guiding hole.

[0025] A height adjustment mechanism and a locking mechanism are provided between the adjusting plate 3 and the base body 1. The height adjustment mechanism includes a second threaded hole provided on the adjusting plate 3 and an adjusting screw 6 connected to the second threaded hole. A countersunk head groove 5 is provided at one end of the second threaded hole. The lower end of the adjusting screw 6 abuts against the base body 1. The locking mechanism includes a countersunk head hole 8 provided on the adjusting plate 3 and a first threaded hole 13 provided on the base body 1 corresponding to the countersunk head hole 8. The locking screw 6 passes through the countersunk head hole 8 and is connected to the first threaded hole 13. A sliding cavity 9 is provided on the base body 1, and a screw connecting block 10 that can slide up and down is provided in the sliding cavity 9. The cross-sections of the screw connecting block 10 and the sliding cavity 9 are both rectangular. The first threaded hole 13 is provided on the screw connecting block 10. A cylinder body 20 is provided at the bottom of the sliding cavity 9. A through hole is provided at the upper end of the cylinder body 20. A second piston 21 is provided in the cylinder body 20. A second cavity 23 is formed between the second piston 21 and the upper end of the cylinder body 20. A spring 22 is provided between the second piston 21 and the upper end of the cylinder body 20. A telescopic rod 24 is connected to the second piston 21. The telescopic rod 24 passes through the through hole, and the upper end of the telescopic rod 24 is connected to the screw connecting block 10. An annular cavity 14 is provided in the base body 1. The annular cavity 14 penetrates the upper end surface of the base body 1. The annular cavity 14 is disposed around the outside of the cavity. A sliding ring 15 that can slide up and down is provided in the annular cavity 14. The sliding ring 15 is circular. The sliding ring 15 is higher than the upper surface of the base body 1. The upper end of the sliding ring 15 abuts against the lower surface of the adjusting plate 3. An elastic member 16 is provided between the lower end of the sliding ring 15 and the bottom of the annular cavity 14. The elastic member 16 is made of spring steel and has a "C"-shaped plate structure. The upper end of the elastic member 16 is connected to the sliding ring 15, and the lower end contacts the bottom of the sliding cavity 14. Four elastic members 16 are provided. The four elastic members 16 are arranged in an annular array at the lower end of the sliding ring 15. A piston cavity is horizontally provided outside the annular cavity 14. A first piston 17 is provided in the piston cavity. A first cavity 19 is formed between the first piston 17 and the bottom of the piston cavity. A push rod 18 is connected to the first piston 17. The push rod 18 faces the outer side surface of the sliding ring 15. The first cavity 19 and the second cavity 23 are connected by a connecting pipe 12. A liquid medium is filled in both the first cavity 19 and the second cavity 23. The liquid medium is hydraulic oil.

[0026] In the present invention, the distance between the upper surface of the adjusting plate and the bottom of the cavity is the actual depth of the cavity. In the present invention, the actual depth of the cavity can be adjusted by changing the distance between the adjusting plate and the base body. During adjustment, first loosen the locking screw, and then rotate the adjusting screw to adjust the height between the adjusting plate and the base body. When the adjusting plate is adjusted to the required height, then tighten the locking screw to lock the adjusting plate.

[0027] When the locking screw is in the tightened state, the screw connection block moves to the uppermost position of the sliding cavity. At this time, the second piston is in the upper limit position, the volume of the second cavity is in the minimum state, the volume of the first cavity is in the maximum state, and the ejector rod is in the longest extended state. At this time, the ejector rod firmly presses against the sliding ring. On the one hand, the sliding ring can support the adjusting plate, and on the other hand, the sliding ring can block the powder raw material to prevent the powder raw material from entering the mating surface between the adjusting plate and the base body, thus causing wear of the mating surface. When adjusting the height of the adjusting plate, it is necessary to first loosen the locking screw. After the locking screw is loosened, the screw connection block will move downward a certain distance in the sliding cavity. During this process, the volume of the second cavity will increase, and part of the liquid medium in the first cavity will flow back to the second cavity, causing the ejector rod to retract a certain distance, and the pressing force of the ejector rod on the sliding ring disappears, thus loosening the sliding ring. At this time, under the action of the elastic component, the upper end of the sliding ring always presses against the lower surface of the adjusting plate, and the sliding ring moves up and down with the adjusting plate; when the adjusting plate is adjusted to the required position, then tighten the locking screw. During the process of tightening the locking screw, the screw connection block moves to the uppermost end of the sliding cavity under the action of the locking screw, and the screw connection block drives the second piston to move upward, causing the liquid medium in the second cavity to flow into the first cavity through the connecting pipe, so that the ejector rod presses against the sliding ring.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A powder metallurgy mold, comprising a base body, a die core is arranged on the base body, and a cavity is arranged in the die core, and it is characterized in that: An adjustment plate is arranged above the base, and a slot corresponding to the cavity is arranged on the adjustment plate. A height adjustment mechanism and a locking mechanism are arranged between the adjustment plate and the base. The height adjustment mechanism includes a second threaded hole arranged on the adjustment plate, an adjustment screw connected to the second threaded hole, and the lower end of the adjustment screw abuts against the base; the locking mechanism includes a countersunk hole arranged on the adjustment plate, and a first threaded hole arranged on the base corresponding to the countersunk hole, and the locking screw passes through the countersunk hole and is connected to the first threaded hole; An annular cavity is arranged in the base body, the annular cavity passes through the upper end surface of the base body, and the annular cavity is arranged around the outer side of the cavity; a sliding ring that can slide up and down is arranged in the annular cavity, and the upper end of the sliding ring contacts the lower surface of the adjustment plate; an elastic component is arranged between the lower end of the sliding ring and the bottom of the annular cavity; a piston cavity is arranged laterally on the outer side of the annular cavity, a first piston is arranged in the piston cavity, a first cavity is formed between the first piston and the bottom of the piston cavity, a push rod is connected to the first piston, and the push rod is directly opposite to the outer side of the sliding ring; the first cavity and the second cavity are connected by a connecting pipe; The base is provided with a sliding cavity, a screw connection block which can slide up and down is provided in the sliding cavity, and the first threaded hole is provided on the screw connection block; a cylinder body is provided at the bottom of the sliding cavity, a through hole is provided at the upper end of the cylinder body, a second piston is provided in the cylinder body, a second cavity is formed between the second piston and the upper end of the cylinder body, a telescopic rod is connected to the second piston, the telescopic rod passes through the through hole, and the upper end of the telescopic rod is connected to the screw connection block; liquid medium is filled in both the first cavity and the second cavity.

2. The powder metallurgy mold according to claim 1, characterized in that The base body is made of die steel.

3. The powder metallurgy mold according to claim 1, characterized in that The mold core is made of tungsten steel.

4. The powder metallurgy mold according to claim 1, characterized in that The base is provided with a first guide hole, the adjustment plate is provided with a second guide hole corresponding to the first guide hole, a guide pin is provided between the adjustment plate and the base, and the guide pin is connected to the first guide hole and the second guide hole at the same time.

5. The powder metallurgy mold according to claim 1, characterized in that A boss is arranged at the upper end of the base, and a groove matching with the boss is arranged on the side of the adjustment plate facing the base, and the boss is slidably connected in the groove; The side surface of the boss contacts the side wall of the groove, and a matching surface is formed therebetween, which guides the up and down movement of the adjustment plate.

6. The powder metallurgy mold according to claim 5, characterized in that A spring is arranged between the second piston and the upper end of the cylinder body.

7. The powder metallurgy mold according to claim 6, characterized in that The liquid medium is hydraulic oil.

8. The powder metallurgy mold according to claim 6, characterized in that The elastic component is made of spring steel and has a "C"-shaped plate structure. The upper end of the elastic component is connected to the sliding ring, and the lower end is in contact with the bottom of the annular cavity.

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