Powder metallurgy die for circular gasket

Abstract

The utility model provides a powder metallurgy die for a circular gasket, which comprises a forming female die, a forming core rod, a forming upper punch and a forming lower punch, a female die cavity is arranged in the middle of the forming female die, the forming lower punch is sleeved on the periphery of the forming core rod, the upper end of the forming lower punch is arranged in the female die cavity, and the forming upper punch is further arranged in the female die cavity. The upper forming punch is arranged at the upper end, located at one end of the female die cavity, of the lower forming punch, and the upper end of the forming core rod is sleeved with the upper forming punch. According to the powder metallurgy die for the circular gasket, the manufacturing cost of one forming lower two punching can be reduced when the die is manufactured, the die filling process is reduced in the die filling process, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy molds, in particular to a powder metallurgy mold for a circular gasket. Background Art

[0002] As Figure 1 , a through-shaped special-shaped central hole 1-1 is newly arranged in the circular gasket 1, and product grooves 1-2 with the same number and alignment are arranged on the upper and lower end faces, thereby forming relatively numerous product thin parts 1-3. To avoid excessive density at the product thin parts; generally, a production mode of matching the forming lower first punch and the lower second punch is adopted for blank forming. However, due to the fierce market competition in the current powder metallurgy industry and the continuous compression of product unit prices, in order for the company to continuously maintain a certain competitiveness, the mold development and design cannot be carried out in the conventional way. The issue of how to reduce the mold development cost becomes particularly important. Summary of the Invention

[0003] Aiming at the deficiencies existing in the prior art, the utility model provides a powder metallurgy mold for a circular gasket, which can reduce the manufacturing cost of a forming lower second punch during the mold manufacturing of the circular gasket, and also reduce the mold loading process during the mold loading process. Thereby improving production efficiency and reducing production costs.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A powder metallurgy mold for a circular gasket, which includes a forming female die, a forming core rod, a forming upper punch, and a forming lower punch. An inner cavity of the forming female die is arranged in the middle. The forming lower punch is sleeved on the outer periphery of the forming core rod. The upper end of the forming lower punch is arranged in the inner cavity of the forming female die. A forming upper punch is also arranged in the inner cavity of the forming female die. The forming upper punch is arranged above one end of the forming lower punch located in the inner cavity of the forming female die. The upper end of the forming core rod passes through the forming lower punch and is sleeved inside the forming upper punch.

[0006] Preferably, in the powder metallurgy mold for the circular gasket, a plurality of forming female die powder escape sections are arranged on the end face of the forming female die. The forming female die powder escape sections are groove structures sunken downward, and the sunken depth is 3-8 mm.

[0007] Preferably, in the powder metallurgy mold for the circular gasket, the forming core rod includes a core rod tungsten steel and a core rod connecting rod arranged outside the core rod tungsten steel. An outer contour part is formed on the outer periphery of the core rod tungsten steel. A core rod tungsten steel taper surface is arranged at the lower end of the core rod tungsten steel. A core rod connecting rod taper hole matching with the core rod tungsten steel taper surface is arranged at the upper end of the core rod connecting rod. An exhaust hole is arranged on the core rod connecting rod at the lower end of the core rod connecting rod taper hole. A core rod locking wrench position and a core rod locking thread section are sequentially arranged on the core rod connecting rod far from the core rod tungsten steel from top to bottom.

[0008] Preferably, for the powder metallurgy mold of the circular gasket, wherein: the taper of the tungsten steel taper surface of the mandrel is 10-30°.

[0009] Preferably, for the powder metallurgy mold of the circular gasket, wherein: the forming upper punch is a cylinder with a smaller upper part and a larger lower part. A forming upper punch head is arranged at the upper end of the forming upper punch. An upper punch outer contour part is arranged on the outer periphery of the forming upper punch head. The upper punch outer contour part is in clearance fit with the female mold cavity. A plurality of upper punch convex surface curved parts are arranged on the end surface of the forming upper punch head. The forming upper punch is provided with a forming upper punch through hole that allows the forming mandrel to pass through and has a smaller upper part and a larger lower part. The forming upper punch through hole sequentially includes a first upper contour segment and a first lower contour segment from top to bottom. The first upper contour segment is in clearance fit with the outer contour part of the tungsten steel mandrel. The diameter of the first lower contour segment is 0.1-1 mm larger than that of the first upper contour segment. An upper punch exhaust hole leading from the outside to the forming upper punch through hole is arranged on the forming upper punch.

[0010] Preferably, for the powder metallurgy mold of the circular gasket, wherein: a first fitting segment in clearance fit with the female mold cavity is arranged at the upper end of the upper punch outer contour part, and the length of the first fitting segment is 5-25 mm.

[0011] Preferably, for the powder metallurgy mold of the circular gasket, wherein: a forming lower punch head is arranged at the upper end of the forming lower punch. A lower punch outer contour part is formed on the outer periphery of the forming lower punch head. The lower punch outer contour part is in clearance fit with the female mold cavity. A plurality of lower punch convex surface curved parts are arranged on the end surface of the forming lower punch head. A forming lower punch through hole that allows the forming mandrel to pass through and has a smaller upper part and a larger lower part is arranged at the central part of the forming lower punch. The forming lower punch through hole includes a second upper segment contour segment and a second lower segment contour segment. The second upper segment contour segment is in clearance fit with the outer contour part. The diameter of the second lower segment contour segment is 0.5-1.5 mm larger than that of the connecting rod of the forming mandrel.

[0012] Preferably, for the powder metallurgy mold of the circular gasket, wherein: a second fitting segment in clearance fit with the female mold cavity is arranged at the upper end of the lower punch outer contour part, and the length of the second fitting segment is 5-25 mm.

[0013] Compared with the prior art, the technical solution of the present utility model has the following beneficial effects:

[0014] For the powder metallurgy mold of the circular gasket of the present utility model, the manufacturing cost of a forming lower two-punch can be reduced during the mold manufacturing, and the mold loading process is also reduced simultaneously during the mold loading process, thereby improving the production efficiency and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an isometric schematic diagram of a circular gasket.

[0016] Figure 2 Is an isometric partial sectional view of the forming female die of the present utility model.

[0017] Figure 3 Is an isometric partial sectional view of the forming mandrel of the present utility model.

[0018] Figure 4 Is an isometric partial sectional view of the forming upper punch of the present utility model.

[0019] Figure 5 Is an isometric partial sectional view of the forming lower punch of the present utility model.

[0020] Figure 6 Is a sectional view of the die assembly of the present utility model. Specific embodiments

[0021] The present utility model will be further described below in conjunction with specific drawings and embodiments.

[0022] As Figure 2-6 Shown: The present utility model provides a powder metallurgy die for a circular gasket, including a forming female die 2, a forming mandrel 3, a forming upper punch 4, and a forming lower punch 5. A female die cavity 2-1 is provided in the middle of the forming female die 2. The forming lower punch 5 is sleeved on the outer periphery of the forming mandrel 3. The upper end of the forming lower punch 5 is arranged in the female die cavity 2-1. A forming upper punch 4 is also provided in the female die cavity 2-1. The forming upper punch 4 is arranged at the upper end of one end of the forming lower punch 5 located in the female die cavity 2-1. The upper end of the forming mandrel 3 passes through the forming lower punch 5 and is sleeved in the forming upper punch 4.

[0023] A plurality of forming female die powder escape sections 2-2 are provided on the end face of the forming female die 2. The forming female die powder escape sections 2-2 are groove structures sunken downward, and the sunken depth is 3 to 8 mm.

[0024] The forming mandrel 3 includes a mandrel tungsten steel 3-1 and a mandrel connecting rod 3-2 arranged outside the mandrel tungsten steel 3-1. An outer contour portion 3-1-1 is formed on the outer periphery of the mandrel tungsten steel 3-1. A mandrel tungsten steel taper surface 3-1-2 is provided at the lower end of the mandrel tungsten steel 3-1. A mandrel connecting rod taper hole 3-2-1 that cooperates with the mandrel tungsten steel taper surface 3-1-2 is provided at the upper end of the mandrel connecting rod 3-2. An exhaust hole 3-2-2 is provided on the mandrel connecting rod 3-2 at the lower end of the mandrel connecting rod taper hole 3-2-1. A mandrel locking wrench position 3-2-4 and a mandrel locking thread section 3-2-3 are sequentially arranged from top to bottom at one end of the mandrel connecting rod 3-2 away from the mandrel tungsten steel 3-1. The taper of the mandrel tungsten steel taper surface 3-1-2 is 10 to 30°.

[0025] The forming upper punch 4 is a cylinder with a smaller upper part and a larger lower part. A forming upper punch head 4-1 is provided at the upper end of the forming upper punch 4. An upper punch outer contour part 4-2 is arranged on the outer periphery of the forming upper punch head 4-1. The upper punch outer contour part 4-2 is in clearance fit with the female mold cavity 2-1. A plurality of upper punch convex surface curved parts 4-4 are arranged on the end surface of the forming upper punch head 4-1. The forming upper punch 4 is provided with a forming upper punch through hole 4-5 that allows the forming mandrel 3 to pass through and has a smaller upper part and a larger lower part. The forming upper punch through hole 4-5 successively includes a first upper contour segment 4-6 and a first lower contour segment 4-7 from top to bottom. The first upper contour segment 4-6 is in clearance fit with the outer contour part 3-1-1 of the mandrel tungsten steel 3-1. The diameter of the first lower contour segment 4-7 is 0.1 - 1 mm larger than that of the first upper contour segment 4-6. An upper punch exhaust hole 4-8 that leads from the outside to the forming upper punch through hole 4-5 is arranged on the forming upper punch 4.

[0026] A first fitting segment 4-3 that is in clearance fit with the female mold cavity 2-1 is arranged at the upper end of the upper punch outer contour part 4-2. The length of the first fitting segment 4-3 is 5 - 25 mm.

[0027] A forming lower punch 5 is provided with a forming lower punch head 5-1 at its upper end. A lower punch outer contour part 5-2 is formed on the outer periphery of the forming lower punch head 5-1. The lower punch outer contour part 5-2 is in clearance fit with the female mold cavity 2-1. A plurality of lower punch convex surface curved parts 5-4 are arranged on the end surface of the forming lower punch head 5-1. A forming lower punch through hole 5-5 that allows the forming mandrel 3 to pass through and has a smaller upper part and a larger lower part is provided at the central part of the forming lower punch 5. The forming lower punch through hole 5-5 includes a second upper segment contour segment 5-6 and a second lower segment contour segment 5-7. The second upper segment contour segment 5-6 is in clearance fit with the outer contour part 3-1-1. The diameter of the second lower segment contour segment 5-7 is 0.5 - 1.5 mm larger than the diameter of the forming mandrel connecting rod 3-2. A second fitting segment 5-3 that is in clearance fit with the female mold cavity 2-1 is arranged at the upper end of the lower punch outer contour part 5-2. The length of the second fitting segment 5-3 is 5 - 25 mm.

[0028] As Figure 1 In the circular gasket 1, a through-shaped central hole 1-1 is provided, and there are the same number of product grooves 1-2 on the upper and lower end faces and they are aligned, thus forming relative product thin parts 1-3.

[0029] The positions and numbers of the forming female mold powder escape sections 2-2 are the same as those of the product grooves 1-2, and the depth is between 3 - 8 mm. The outer contour part 3-1-1 of the forming mandrel tungsten steel 3-1 conforms to the shaped central hole 1-1 provided in the circular gasket 1.

[0030] When welding the mandrel tungsten steel 3-1 and the mandrel connecting rod 3-2, gas can be discharged through the exhaust hole 3-2-2, so that pores can be effectively avoided during welding, thereby improving the welding strength.

[0031] The outer shape of the forming upper punch 4 is a cylinder with a smaller upper part and a larger lower part. Since the upper punch head 4-1 needs to enter the female mold cavity 2-1 to press the product during the production process, a certain assembly clearance is required. Considering that too large a clearance will cause burrs on the product embryo during the forming process, and too small a clearance is likely to cause the mold to heat up and expand during continuous operation, resulting in the phenomenon of clamping with the forming female mold 2. Therefore, the outer contour part 4-2 of the upper punch in the forming upper punch head 4-1 must be in clearance fit with the female mold cavity 2-1 with a clearance of 0.005 - 0.02, and the specific length is set between 5 - 25 mm. And on the end face of the upper punch head 4-1, there is an upper punch convex surface curved part 4-4 that matches the shape, quantity, and angle of the product groove 1-2 provided on the circular gasket 1.

[0032] The first upper section contour part 4-6 of the forming upper punch through hole 4-5 is in clearance fit with the outer contour part 3-1-1 of the core rod tungsten steel 3-1 with a clearance of 0.003 - 0.015, and the specific length is set between 5 - 25. The first lower contour section 4-7 of the forming upper punch through hole 4-5 has a diameter 0.1 - 1 mm larger than that of the first upper contour section.

[0033] The circular gasket 1 is a product symmetrical up and down. Therefore, the outer shape characteristics of the forming lower punch 5 and the forming upper punch 4 are both cylindrical bodies with a smaller upper part and a larger lower part. The upper end of the forming lower punch 5 is provided with a forming lower punch head 5-1. Since the forming lower punch head 5-1 reciprocates in the female mold cavity 2-1 during the production process, a certain clearance is required. Considering that too large a clearance will cause the powder raw material to leak out in the clearance during the filling process, and too small a clearance is likely to cause the mold to heat up and expand during continuous operation, resulting in the phenomenon of clamping with the forming female mold 2. The lower punch outer contour part 5-2 in the forming lower punch head 5-1 must be in clearance fit with the female mold cavity 2-1 with a clearance of 0.005 - 0.02, and the specific length is set between 5 - 25 mm to relatively reduce the friction resistance. And on the end face of the lower punch head 5-1, there is a lower punch convex surface curved part 5-4 that matches the shape, quantity, and angle of the product groove 1-2 provided on the circular gasket 1.

[0034] In the central part of the forming lower punch 5, there is a forming lower punch through hole 5-5 that allows the forming core rod 3 to pass through and has a smaller upper part and a larger lower part. The upper section contour part 5-6 of the forming lower punch through hole 5-5 needs to be in clearance fit with the outer contour part 3-1-1 of the core rod tungsten steel 3-1 with a clearance of 0.003 - 0.015, and the specific length is set between 5 - 25 mm.

[0035] Assembly process of the utility model: Fix the forming mandrel 3 to the forming machine by using the mandrel locking thread 3-2-3 and the mandrel locking wrench position 3-2-4; Align the through hole 5-5 of the forming lower punch 5 with the outer contour part 3-1-1 of the forming mandrel 3, then sleeve it from top to bottom and install it on the forming machine; Align the cavity 2-1 of the forming female die 2 with the outer contour 4-2 of the upper punch of the forming lower punch 4-1, then sleeve it from top to bottom and install it on the forming machine; Turn the forming upper punch 4 of the forming upper punch 4 downward, align the outer contour part 4-2 of the upper punch with the cavity 2-1 of the forming female die 2, then sleeve it in, fix it on the forming machine, and then adjust the forming machine to the working position state.

[0036] When the product is being pressed, first, the machine equipment will enter the filling position. At this time, the powder raw material is filled into the cavity 2-1 of the forming female die 2. Since the situation of powder leakage during powder filling has been considered in the design process of the forming lower punch 5, and a certain assembly clearance has been controlled, the powder is ensured not to leak through the gaps in the assembly clearance during filling. At this time, the forming upper punch 4 enters the cavity 2-1 from top to bottom. When the convex surface curved part 5-4 of the lower punch of the forming upper punch 4 touches the powder raw material, the local powder raw material will be ejected from the powder escape section 2-2 of the forming female die 2 in the forming female die 2, thereby reducing the local raw material. During pressing, the density of the thin part 1-3 of the product can be effectively reduced, making the overall density more consistent.

[0037] When manufacturing the mold of the circular gasket of the utility model, the manufacturing cost of one forming lower second punch can be reduced, and the mold assembly process is also reduced during the mold assembly process, thereby improving production efficiency and reducing production costs.

[0038] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the utility model and are not restrictive. Although the utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the utility model, and they should all be covered within the scope of the claims of the utility model.

Claims

1. A powder metallurgy mold for a circular gasket, characterized in that: The present invention comprises a female molding die (2), a molding core rod (3), a molding upper punch (4), and a molding lower punch (5); a female mold cavity (2-1) is arranged in the middle of the female molding die (2); a molding lower punch (5) is sleeved on the outer periphery of the molding core rod (3); the upper end of the molding lower punch (5) is arranged in the female mold cavity (2-1); a molding upper punch (4) is also arranged in the female mold cavity (2-1); the molding upper punch (4) is arranged at the upper end of the molding lower punch (5) located at one end of the female mold cavity (2-1); the upper end of the molding core rod (3) passes through the molding lower punch (5) and is sleeved in the molding upper punch (4).

2. The powder metallurgy mold for the circular gasket according to claim 1, characterized in that: The end surface of the female molding die (2) is provided with a plurality of female molding die powder escape sections (2-2), and the female molding die powder escape sections (2-2) are downwardly concave groove structures, and the concave depth is 3-8 mm.

3. The powder metallurgy mold for the circular gasket according to claim 1, characterized in that: The forming mandrel (3) comprises a mandrel tungsten steel (3-1) and a mandrel connecting rod (3-2) arranged outside the mandrel tungsten steel (3-1); the outer periphery of the mandrel tungsten steel (3-1) forms an outer contour portion (3-1-1); a mandrel tungsten steel tapered surface (3-1-2) is arranged at the lower end of the mandrel tungsten steel (3-1); a mandrel connecting rod tapered hole (3-2-1) matching the mandrel tungsten steel tapered surface (3-1-2) is arranged at the upper end of the mandrel connecting rod (3-2); an exhaust hole (3-2-2) is arranged on the mandrel connecting rod (3-2) at the lower end of the mandrel connecting rod tapered hole (3-2-1); and a mandrel locking wrench position (3-2-4) and a mandrel locking screw thread section (3-2-3) are arranged in sequence from top to bottom on the end of the mandrel connecting rod (3-2) away from the mandrel tungsten steel (3-1).

4. The powder metallurgy mold for the circular gasket according to claim 3, characterized in that: The taper of the tungsten steel taper surface (3-1-2) of the core rod is 10-30°.

5. The powder metallurgy mold for the circular gasket according to claim 3, characterized in that: The forming upper punch (4) is a cylindrical body that is smaller at the top and larger at the bottom. A forming upper punch head (4-1) is arranged at the upper end of the forming upper punch (4). An upper punch outer contour portion (4-2) is arranged on the outer periphery of the forming upper punch head (4-1). The upper punch outer contour portion (4-2) is matched with the clearance of the female mold cavity (2-1). A plurality of upper punch convex surface curved portions (4-4) are arranged on the end face of the forming upper punch head (4-1). The forming upper punch (4) is provided with a forming upper punch through hole that allows the forming core rod (3) to pass through and is smaller at the top and larger at the bottom. (4-5), the forming upper punch through hole (4-5) includes, from top to bottom, a first upper contour segment (4-6) and a first lower contour segment (4-7), the first upper contour segment (4-6) is clearance-matched with the outer contour portion (3-1-1) of the core rod tungsten steel (3-1), the first lower contour segment (4-7) is 0.1 to 1 mm larger in diameter than the first upper contour segment (4-6), and an upper punch exhaust hole (4-8) is provided on the forming upper punch (4) and is connected from the outside to the forming upper punch through hole (4-5).

6. The powder metallurgy mold for the circular gasket according to claim 5, characterized in that: The upper end of the upper punch outer contour portion (4-2) is provided with a first matching section (4-3) that matches the clearance of the female mold cavity (2-1), and the length of the first matching section (4-3) is 5 to 25 mm.

7. The powder metallurgy mold for the circular gasket according to claim 3, characterized in that: A forming lower punch punch (5-1) is arranged at the upper end of the forming lower punch (5), a lower punch outer contour portion (5-2) is formed on the outer periphery of the forming lower punch punch (5-1), the lower punch outer contour portion (5-2) is clearance matched with the female mold cavity (2-1), a plurality of lower punch convex surface curved portions (5-4) are arranged on the end face of the forming lower punch punch (5-1), a forming lower punch through hole (5-5) which is smaller at the top and larger at the bottom and allows the forming core rod (3) to pass through is arranged at the center of the forming lower punch (5), the forming lower punch through hole (5-5) comprises a second upper contour segment (5-6) and a second lower contour segment (5-7), the second upper contour segment (5-6) is clearance matched with the outer contour portion (3-1-1), and the diameter of the second lower contour segment (5-7) is 0.5 to 1.5 mm larger than the diameter of the forming core rod connecting rod (3-2).

8. The powder metallurgy mold for the circular gasket according to claim 7, characterized in that: The upper end of the lower punch outer contour portion (5-2) is provided with a second matching section (5-3) matching with the clearance of the female mold cavity (2-1), and the length of the second matching section (5-3) is 5 to 25 mm.

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