Pressing die for powder metallurgy production of double-row special-shaped gears and pressing method of pressing die

Abstract

The invention relates to a pressing die for powder metallurgy production of double-row special-shaped gears, which comprises an upper mounting seat and a lower mounting seat, the upper mounting seat is slidably mounted on four guide columns of a powder hydraulic machine and can be adjusted in a vertical lifting manner, the lower mounting seat is fixedly arranged on the four guide columns, and a first driving mechanism for driving the upper mounting seat to lift is mounted on the powder hydraulic machine; a lower die head is mounted on the lower mounting seat; the upper mounting seat comprises two mounting blocks which are oppositely arranged, each mounting block is in sliding connection with the two guide columns on the same side, and a forming mechanism is arranged between the two mounting blocks; according to the double-row special-shaped gear pressing die, the structural form of the pressing die is improved, the forming tooth cavities are in the structural form of left-right separation and combination and up-down movement, so that the double-row special-shaped gear can be integrally formed in a powder metallurgy machining mode, secondary machining is omitted, the product quality is obviously improved, and the market competitiveness of products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy production, in particular to a pressing die and a pressing method for powder metallurgy production of double-row special-shaped gears. Background Art

[0002] Double-row gears are a commonly used transmission component. Conventional double-row gears have the same thickness at both ends. However, our company customizes a double-row special-shaped gear based on customer needs. The thickness of the two ends is different, one end has a larger diameter and the other end has a smaller diameter.

[0003] At present, the conventional double-row gear forming die through powder metallurgy process includes a forming cavity, a lower die head used to block the lower opening of the forming cavity and can be raised and lowered, and an upper die head used to block the upper opening of the forming cavity and can be raised and lowered. The forming method is: the lower die head blocks the lower opening of the forming cavity, pours powder into the forming cavity, and the upper die head descends and inserts into the forming cavity. The double-row gear is pressed and formed by the cooperation of the upper die head, the lower die head and the forming cavity. After the product is formed, the upper die head rises, and the lower die head rises to push the product out of the forming cavity.

[0004] However, for double-row special-shaped gears, since they are thick at the bottom and thin at the top, they cannot be processed through the existing molding cavity. At the same time, after the product is formed, since the bottom is thick and the top is thin, the existing mold cannot eject the formed product. Therefore, for the double-row special-shaped gear product, the only way is to first produce regular parts and then use a lathe for secondary processing, which has very low production efficiency.

[0005] Based on the above technical problems, in order to effectively solve the processing difficulties in the production of double-row special-shaped gears and improve production efficiency, the inventor, after a long period of design and research and development, proposed a pressing die and a pressing method for powder metallurgy production of double-row special-shaped gears, which effectively solved this processing problem and significantly improved production efficiency. Because secondary processing is eliminated, product quality is also significantly improved, which improves the market competitiveness of the product and has been unanimously praised by users. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a pressing die for powder metallurgy production of double-row special-shaped gears and a pressing method thereof.

[0007] The first aspect of the present invention provides a pressing die for powder metallurgy production of double-row special-shaped gears, comprising an upper mounting seat slidably mounted on four guide pillars of a powder hydraulic press and capable of being adjusted up and down, and a lower mounting seat fixedly mounted on the four guide pillars, a first driving mechanism for driving the upper mounting seat to rise and fall is mounted on the powder hydraulic press; a lower die head is mounted on the lower mounting seat; the upper mounting seat comprises two mounting blocks arranged opposite to each other, each mounting block is slidably connected to two guide pillars on the same side, a molding mechanism is arranged between the two mounting blocks, the molding mechanism comprises two molding blocks, both sides of each molding block are slidably connected to the two mounting blocks, and the two Each molding block can slide horizontally to realize opening and closing adjustment, and a second driving mechanism for driving the molding block to move horizontally is installed on the powder hydraulic press; each molding block is provided with a molding groove, and the molding grooves on the two molding blocks are buckled to form a molding tooth cavity that is thin at the top and thick at the bottom; it also includes an upper die head, which can be raised and lowered and can be inserted from the upper end of the molding tooth cavity, and a lower die head can be inserted from the lower end of the molding tooth cavity; in order to avoid the two molding blocks from separating during the pressure molding process, a limit plate that can be raised and lowered and can block the molding block to limit its position is provided at each end of the two mounting blocks, and when the two molding blocks are molded, the limit plates on both sides are lifted to block the molding blocks.

[0008] Preferably, in order to improve the mold closing effect of the two molding blocks, an insert block is provided on the contact end face of one molding block, and a slot for inserting the insert block is provided on the contact end face of the other corresponding molding block. When the two molding blocks are molded together, the insert block is inserted into the slot.

[0009] Preferably, first slide grooves are provided on both side edges of each forming block, and first slide rails cooperating with the first slide grooves are provided on each mounting block, so that horizontal sliding of the forming block can be achieved through the cooperation between the first slide grooves and the first slide rails.

[0010] Preferably, the upper die head is connected to the piston rod of the hydraulic cylinder of the powder hydraulic press, and the upper die head is lifted and lowered under the action of the hydraulic cylinder, and the product is pressed and formed at the same time.

[0011] Preferably, the first driving mechanism includes two first cylinders, the two first cylinders correspond to two mounting blocks respectively, the piston rod of the first cylinder is connected to the mounting block, and the cylinder seat of the first cylinder is connected to the base of the powder hydraulic press. The upper mounting seat can be lifted and lowered under the cooperation of the two first cylinders.

[0012] Preferably, the second driving mechanism includes two second cylinders, the two second cylinders correspond to two forming blocks respectively, the cylinder body of each second cylinder is fixed to the top surface of the mounting block, and the piston rod of each second cylinder is connected to the forming block. The two forming blocks are horizontally displaced by the cooperation of the two second cylinders.

[0013] Preferably, a third driving mechanism for driving the limiting plate to move up and down is installed on the mounting block.

[0014] Preferably, a second slide groove is provided on the mounting block, and a second slide rail cooperating with the second slide groove is provided on the limit plate. The limit plate is lifted and lowered by cooperating with the second slide groove and the second slide rail. The third driving mechanism includes two third cylinders, which correspond to two limit plates respectively. The cylinder body of each third cylinder is fixed to the mounting block, and the piston rod of each third cylinder is connected to the limit plate. The lifting and lowering of the two limit plates is achieved by cooperating with the two third cylinders.

[0015] A second aspect of the present invention provides a pressing method of the above-mentioned pressing mold, characterized in that it comprises the following steps:

[0016] (1) The forming grooves on the two forming blocks are buckled to form a forming tooth cavity;

[0017] (2) The upper mounting seat carries the forming tooth cavity downward so that the lower die head is inserted from the lower end of the forming tooth cavity;

[0018] (3) The limit plates on both sides rise to block the forming block to limit its position;

[0019] (4) injecting powder into the molded tooth cavity;

[0020] (5) The upper die head descends and is inserted from the upper end of the forming tooth cavity, applying pressure to form the double-row special-shaped gear product;

[0021] (6) The upper die head rises and returns to its original position, and the limit plates on both sides descend to release the limit on the forming block;

[0022] (7) The two forming blocks are separated, and the upper mounting seat is lifted up with the two forming blocks;

[0023] (8) The robot takes out the molded product from the lower die head.

[0024] The beneficial effects of the present invention are:

[0025] The present application transforms the structural form of the pressing die, and the forming tooth cavity adopts a structural form of left-right separation and combination and up-and-down movement, so that double-row special-shaped gears can be integrally formed by powder metallurgy processing, eliminating secondary processing, significantly improving product quality, and enhancing the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a stereogram of the present invention;

[0027] Figure 2 A top view of the present invention;

[0028] Figure 3 This is a schematic diagram of the working state of the present invention before pressing;

[0029] Figure 4This is a schematic diagram of the working state of the present invention during pressing;

[0030] Figure 5 yes Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0031] As shown in the figure:

[0032] 1. Lower mounting seat, 2. Mounting block, 3. Guide column, 4. Forming block, 5. Forming groove, 6. Insert block, 7. Double-row special-shaped gears, 8. Upper die head, 9. Forming tooth cavity, 10. Lower die head, 11. First cylinder, 12. Base, 13. First slide groove, 14. First slide rail, 15. Second slide groove, 16. Second slide rail, 17. Limit plate. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0034] like Figure 1-5 As shown, a pressing die for powder metallurgy production of double-row special-shaped gears includes an upper mounting seat that is slidably mounted on four guide pillars 3 of a powder hydraulic press and can be adjusted up and down, and a lower mounting seat 1 that is fixedly mounted on the four guide pillars 3. A first driving mechanism for driving the upper mounting seat to rise and fall is installed on the powder hydraulic press. A lower die head 10 is installed on the lower mounting seat 1. The upper mounting seat includes two mounting blocks 2 that are arranged opposite to each other, each mounting block 2 is slidably connected to two guide pillars 3 on the same side, a molding mechanism is arranged between the two mounting blocks 2, the molding mechanism includes two molding blocks 4, both sides of each molding block 4 are slidably connected to the two mounting blocks 2, the two molding blocks 4 can slide horizontally to achieve opening and closing adjustment, and a second driving mechanism for driving the molding blocks 4 to move horizontally is installed on the powder hydraulic press. A molding groove 5 is provided on each molding block 4, and the molding grooves 5 on the two molding blocks 4 are buckled to form a molding tooth cavity 9 that is thin at the top and thick at the bottom. It also includes an upper die head 8 which can be raised and lowered and can be inserted from the upper end of the forming tooth cavity 9 , and a lower die head 10 which can be inserted from the lower end of the forming tooth cavity 9 .

[0035] In order to prevent the two molding blocks 4 from being separated during the pressure molding process, a limit plate 17 that can be raised and lowered and can block the molding block 4 to limit its position is provided at each end of the two mounting blocks 2. When the two molding blocks 4 are molded together, the limit plates 17 on both sides are raised to block the molding blocks 4. Furthermore, a third driving mechanism for driving the limit plate 17 to rise and fall is installed on the mounting block 2.

[0036] In this embodiment, in order to improve the mold closing effect of the two molding blocks 4, an insert block 6 is provided on the contact end surface of one molding block 4, and a slot for inserting the insert block 6 is provided on the contact end surface of the other corresponding molding block 4. When the two molding blocks 4 are molded together, the insert block 6 is inserted into the slot.

[0037] In this embodiment, first slide grooves 13 are provided on both sides of each forming block 4, and first slide rails 14 cooperating with the first slide grooves 13 are provided on each mounting block 2. The cooperation between the first slide grooves 13 and the first slide rails 14 enables horizontal sliding of the forming block 4.

[0038] In this embodiment, the upper die head 8 is connected to the piston rod of the hydraulic cylinder of the powder hydraulic press, and the upper die head 8 is lifted and lowered under the action of the hydraulic cylinder, and the product is pressed and formed at the same time.

[0039] In this embodiment, the first driving mechanism includes two first cylinders 11, the two first cylinders 11 correspond to two mounting blocks 2 respectively, the piston rod of the first cylinder 11 is connected to the mounting block 2, and the cylinder seat of the first cylinder 11 is connected to the base 12 of the powder hydraulic press. The upper mounting seat can be lifted and lowered under the cooperation of the two first cylinders 11.

[0040] In this embodiment, the second driving mechanism includes two second cylinders (not marked in the figure), the two second cylinders respectively correspond to the two forming blocks 4, the cylinder body of each second cylinder is fixed to the top surface of the mounting block 2, and the piston rod of each second cylinder is connected to the forming block 4. The two forming blocks 4 are horizontally displaced by the cooperation of the two second cylinders.

[0041] In this embodiment, a second slide groove 15 is provided on the mounting block 2, and a second slide rail 16 cooperating with the second slide groove 15 is provided on the limit plate 17, and the lifting and lowering adjustment of the limit plate 17 is realized by the cooperation between the second slide groove 15 and the second slide rail 16. The third driving mechanism includes two third cylinders (not marked in the figure), and the two third cylinders correspond to the two limit plates 17 respectively. The cylinder body of each third cylinder is fixed to the mounting block 2, and the piston rod of each third cylinder is connected to the limit plate 17. The lifting and lowering of the two limit plates 17 is realized by the cooperation of the two third cylinders.

[0042] The pressing method of the pressing mold comprises the following steps:

[0043] (1) The forming grooves 5 on the two forming blocks 4 are buckled to form a forming tooth cavity 9;

[0044] (2) The upper mounting seat carries the forming tooth cavity 9 downward so that the lower die head 10 is inserted from the lower end of the forming tooth cavity 9;

[0045] (3) The limiting plates 17 on both sides rise to block the forming block 4 to limit its position;

[0046] (4) Injecting powder into the forming tooth cavity 9;

[0047] (5) The upper die head 8 descends and is inserted from the upper end of the forming tooth cavity 9, applying pressure to form the double-row special-shaped gear 7 product;

[0048] (6) The upper die head 8 is raised and returned to its original position, and the limiting plates 17 on both sides are lowered to release the limiting of the forming block 4;

[0049] (7) The two forming blocks 4 are separated, and the upper mounting seat carries the two forming blocks 4 and rises;

[0050] (8) The robot takes out the molded product on the lower die head 10.

[0051] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A pressing die for powder metallurgy production of double-row special-shaped gears, characterized by: The invention comprises an upper mounting seat which is slidably mounted on four guide pillars of the powder hydraulic press and can be adjusted up and down, and a lower mounting seat which is fixedly mounted on the four guide pillars, a first driving mechanism for driving the upper mounting seat to be lifted and lowered is installed on the powder hydraulic press; a lower die head is installed on the lower mounting seat; the upper mounting seat comprises two mounting blocks which are arranged opposite to each other, each mounting block is slidably connected to two guide pillars on the same side, a forming mechanism is arranged between the two mounting blocks, the forming mechanism comprises two forming blocks, both sides of each forming block are slidably connected to the two mounting blocks, the two forming blocks can slide horizontally to realize opening and closing adjustment, a second driving mechanism for driving the forming blocks to be horizontally displaced is installed on the powder hydraulic press; a forming groove is arranged on each forming block, the forming grooves on the two forming blocks are buckled to form a forming tooth cavity which is thin at the top and thick at the bottom; an upper die head is also included, the upper die head can be lifted and lowered and can be inserted from the upper end of the forming tooth cavity, and the lower die head can be inserted from the lower end of the forming tooth cavity; a limit plate which can be lifted and lowered and can block the forming block from limiting its position is arranged at each end of the two mounting blocks.

2. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 1, characterized in that: An insert block is arranged on the contact end surface of one of the forming blocks, and a slot for inserting the insert block is arranged on the contact end surface of another corresponding forming block.

3. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 1, characterized in that: First slide grooves are provided on both side edges of each forming block, and first slide rails matched with the first slide grooves are provided on each mounting block.

4. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 1, characterized in that: The upper die head is connected with the piston rod of the hydraulic cylinder of the powder hydraulic press.

5. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 1, characterized in that: The first driving mechanism comprises two first cylinders, the two first cylinders correspond to two mounting blocks respectively, the piston rods of the first cylinders are connected to the mounting blocks, and the cylinder seats of the first cylinders are connected to the base of the powder hydraulic press.

6. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 3, characterized in that: The second driving mechanism includes two second cylinders, the two second cylinders correspond to two forming blocks respectively, the cylinder body of each second cylinder is fixed to the top surface of the mounting block, and the piston rod of each second cylinder is connected to the forming block.

7. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 1, characterized in that: A third driving mechanism for driving the limiting plate to move up and down is installed on the mounting block.

8. The pressing die for powder metallurgy production of double-row special-shaped gears according to claim 7, characterized in that: A second slide groove is provided on the mounting block, and a second slide rail matching the second slide groove is provided on the limiting plate. The third driving mechanism includes two third cylinders, and the two third cylinders correspond to two limiting plates respectively. The cylinder body of each third cylinder is fixed to the mounting block, and the piston rod of each third cylinder is connected to the limiting plate.

9. The pressing method of any one of claims 1 to 8, characterized in that: The following steps are involved: (1) The forming grooves on the two forming blocks are buckled to form a forming tooth cavity; (2) The upper mounting seat carries the forming tooth cavity downward so that the lower die head is inserted from the lower end of the forming tooth cavity; (3) The limit plates on both sides rise to block the forming block to limit its position; (4) injecting powder into the molded tooth cavity; (5) The upper die head descends and is inserted from the upper end of the forming tooth cavity, applying pressure to form the double-row special-shaped gear product; (6) The upper die head rises and returns to its original position, and the limit plates on both sides descend to release the limit on the forming block; (7) The two forming blocks are separated, and the upper mounting seat is lifted up with the two forming blocks; (8) The robot takes out the molded product from the lower die head.

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