A special-shaped workpiece powder metallurgy part forming jig

Abstract

The utility model discloses a kind of special-shaped workpiece powder metallurgy piece forming jig, comprising: upper die assembly, including upper die holder, upper die core and upper die ram;Lower die assembly, including lower die holder, lower die core and first lower die backing plate and second lower die backing plate;Upper die core, lower die core and cavity are jointly restricted to the die cavity for workpiece forming;Ejection mechanism, including ejector rod and ejection cylinder;Lower die holder includes fixed lower die plate and movable lower die plate, and lower die core includes fixed lower die punch and floating lower die punch;Fixed lower die punch is arranged in fixed lower die plate, and floating lower die punch is arranged in movable lower die plate, movable lower die plate side facing fixed lower die plate, form protrusion, fixed lower die plate correspondingly form through-hole for protrusion passing;The utility model improves the forming precision and surface quality of spandex matching seat powder metallurgy piece by optimizing tooling structure design, reduces mould processing cost, simplifies ejection process, improves production efficiency, prolongs mould service life, reduces production cost.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy part forming, and in particular to a jig for forming irregularly shaped powder metallurgy parts. Background Technology

[0002] In the textile industry, spandex fittings are key components of textile machines, and their performance directly affects the operational stability of the machines and the quality of textile products. Traditional spandex fitting manufacturing processes have many problems. For example, when using casting processes, defects such as porosity and shrinkage are prone to occur inside the product, resulting in insufficient strength and precision of the parts; when using machining processes, material utilization is low, processing costs are high, and production efficiency is low.

[0003] Powder metallurgy technology, due to its advantages such as near-net-shape forming, high material utilization, and ability to produce complex-shaped parts, is increasingly being applied to the manufacturing of spandex fittings. However, existing powder metallurgy forming tooling suffers from long floating punch strokes when used for workpieces with left and right stepped structures, leading to easy wear of the floating punches. Furthermore, the tooling's demolding process is complex, affecting production efficiency, and the short lifespan of the molds increases production costs. Therefore, there is an urgent need to design a new type of powder metallurgy forming tooling for textile machine spandex fittings to solve these problems. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, the purpose of this utility model is to provide a fixture for improving the forming accuracy and surface quality of spandex-mounted powder metallurgy parts.

[0005] To achieve the above objectives, embodiments of this utility model provide a forming fixture for irregularly shaped powder metallurgy workpieces, comprising:

[0006] The upper mold assembly includes an upper mold base, an upper mold core, and an upper mold pressure head;

[0007] The lower mold assembly includes a lower mold base, a lower mold core, a first lower mold pad, and a second lower mold pad;

[0008] The upper mold core, lower mold core, and female mold together define the mold cavity for forming the workpiece;

[0009] The demolding mechanism includes ejector rods and demolding cylinders;

[0010] The lower die base includes a fixed lower die plate and a movable lower die plate, and the lower die core includes a fixed lower die punch and a floating lower die punch; the fixed lower die punch is disposed on the fixed lower die plate, and the floating lower die punch is disposed on the movable lower die plate. The movable lower die plate has a protrusion on the side facing the fixed lower die plate, and the fixed lower die plate has a corresponding through hole for the protrusion to pass through.

[0011] The first lower die pad is disposed between the fixed lower die plate and the upper die base, and the second lower die pad is disposed on the top surface of the protrusion. When the movable lower die plate moves relative to the fixed lower die plate, the second lower die pad abuts against the space between the movable lower die plate and the upper die base, thus limiting the movement distance of the floating lower die punch.

[0012] The ejector rod is located inside the lower mold base, with one end connected to the bottom of the lower mold core and the other end extending out of the lower mold base and connected to the piston rod of the demolding cylinder.

[0013] According to an embodiment of the present invention, a forming fixture for irregularly shaped powder metallurgy parts improves the forming accuracy and surface quality of spandex-supported powder metallurgy parts by optimizing the tooling structure design, reducing mold processing costs, simplifying the demolding process, improving production efficiency, extending mold service life, and reducing production costs.

[0014] In addition, the powder metallurgy forming fixture for irregularly shaped workpieces proposed in the above embodiments of this utility model may also have the following additional technical features:

[0015] Optionally, the upper mold base is a rectangular plate structure with a mounting hole at its top for connection with the press, and is fixedly connected to the slide block of the press by bolts.

[0016] Optionally, the upper mold core is fixedly installed at the bottom of the upper mold base, and the shape of the upper mold core matches the shape of the upper half of the spandex base.

[0017] Optionally, the upper die pressure head is located below the upper die core and can slide vertically on the upper die base.

[0018] Optionally, the lower mold base is a square base placed on the worktable of the press, and its bottom is provided with a positioning key that cooperates with the positioning groove on the worktable of the press.

[0019] Optionally, the lower die core is mounted on top of the lower die base, and the shape of the lower die core matches the shape of the lower half of the spandex base.

[0020] Optionally, the lower mold pad is disposed below the lower mold core, serving as a support and buffer. Attached Figure Description

[0021] Figure 1 This is an exploded view from one angle according to an embodiment of the present invention;

[0022] Figure 2 This is an exploded view from another angle according to one embodiment of the present invention;

[0023] Figure 3 This is an exploded view from another angle according to one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a workpiece after molding according to one embodiment of the present invention.

[0025] Label Explanation:

[0026] Upper mold assembly 1, upper mold base 11, upper mold core 12, upper mold pressure head 13

[0027] Lower mold assembly 2, lower mold base 21, movable lower template 211, step 2111, fixed lower template 212, through hole 2121

[0028] Lower die core 22, fixed lower die punch 221, floating lower die punch 222

[0029] First lower mold pad 23 Second lower mold pad 24

[0030] Demolding mechanism 3 ejector rod 31. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] This invention improves the forming accuracy and surface quality of spandex-supported powder metallurgy parts by optimizing the tooling structure design, reducing mold processing costs, simplifying the demolding process, improving production efficiency, extending mold life, and reducing production costs.

[0033] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0034] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0035] Figures 1 to 3 A powder metallurgical forming fixture for irregularly shaped workpieces according to an embodiment of the present utility model includes:

[0036] The overall structure of this utility model consists of an upper mold assembly 1, a lower mold assembly 2, and a mold cavity. The upper mold assembly 1 includes an upper mold base 11, an upper mold core 12, and an upper mold pressure head 13. The lower mold assembly 2 includes a lower mold base 21, a lower mold core 22, a first lower mold pad 23, and a second lower mold pad 24. The mold cavity, composed of the upper mold core 12, the lower mold core 22, and a female mold, is used to fill powder metallurgy raw materials.

[0037] The upper die assembly 1 has an upper die base 11, which is a rectangular plate structure with a mounting hole at the top for connection to a press. It is fixedly connected to the press's slider by bolts, ensuring that the upper die assembly 1 can stably receive the pressure transmitted by the press during the forming process. The upper die core 12 is fixedly installed at the bottom of the upper die base 11. The shape of the upper die core 12 matches the shape of the upper half of the spandex base, and its surface is precision-machined with low roughness to ensure good precision and surface quality of the formed spandex base. The upper die pressure head 13 is located below the upper die core 12 and can slide vertically on the upper die base 11. Driven by a fully automatic mechanical press for powder metallurgy, it can apply precise pressure during powder pressing.

[0038] The lower die assembly 2 has a square base 21, which is placed on the press table. Its bottom has a positioning key that engages with the positioning groove on the press table to achieve precise positioning of the lower die assembly 2. The lower die core 22 is installed on top of the lower die base 21. The shape of the lower die core 22 matches the lower half of the spandex support. A lower die pad is placed below the lower die core 22, providing support and cushioning to prevent damage to the lower die core 22 due to excessive force during pressing, and also helping to ensure the flatness of the lower die core 22.

[0039] Specifically, in the existing structure, the lower die holder 21 is integrally set, and the lower die core 22 has a fixed lower die punch 221 and a floating lower die punch 222. In the existing structure, the floating lower die punch 222 must move in the lower die holder 21, which requires the floating lower die punch 222 to be lengthened to meet the stroke requirements. For parts with multiple steps, complex structure and small size, the floating lower die punch 222 is difficult to process and has high wear.

[0040] Therefore, in this design, the lower die base is separately configured as a movable lower template 211 and a fixed lower template 212. The first lower die pad 23 is set on the movable lower template 211, while the second lower die pad 24 is set on the fixed lower template 212. The effect is that the floating lower die punch 222 is driven by the movable lower template 211, and its stroke relative to the lower die base 21 is reduced. There is no need to make an extended floating lower die punch 222, which reduces wear, lowers the requirements for machining accuracy, and thus reduces costs.

[0041] In some embodiments, the fixed lower template 212 has a through hole 2121, and the movable lower template 211 has a step 2111 that can pass through the through hole 2121. When the movable lower template 211 moves upward, it drives the floating lower die punch 222 to move. After the step 2111 passes through the through hole 2121, the movable lower template 211 abuts against the bottom surface of the fixed lower template 212, thereby realizing the motion mode in which the floating lower die punch 222 does not move relative to the lower die base.

[0042] In the mold cavity structure, the size of the mold cavity is designed with a certain shrinkage allowance to compensate for the shrinkage deformation of the powder metallurgy parts during the sintering process and to ensure the dimensional accuracy of the final product.

[0043] The demolding mechanism 3 includes an ejector rod 31 and a demolding cylinder. The ejector rod 31 is located inside the lower mold base 21, with one end connected to the bottom of the lower mold core 22 and the other end extending out of the lower mold base 21 and connected to the piston rod of the demolding cylinder. After molding is completed, the demolding cylinder actuates, pushing the ejector rod 31 upward through the piston rod, ejecting the molded spandex base from the lower mold core 22, allowing for easy removal of the product. This greatly simplifies the demolding process and improves production efficiency. It also improves molding accuracy and surface quality: through a precisely designed mold cavity and a high-precision machined mold core, the dimensional accuracy and surface quality of the spandex base powder metallurgy parts can be guaranteed, meeting the high precision requirements of textile machines for spandex bases.

[0044] This invention simplifies the demolding process and improves production efficiency: the detachable side mold wall and the efficient demolding mechanism 3 make the demolding process simpler and faster, greatly shortening the production cycle and improving production efficiency.

[0045] Extending mold lifespan: The design of the lower die pad and the reasonable pressure distribution reduce mold wear during the pressing process. At the same time, shortening the effective length of the lower die punch reduces the thermal stress caused by temperature changes due to friction, thereby extending the mold lifespan and reducing production costs.

[0046] Energy-saving and environmentally friendly: This powder metallurgy near-forming process reduces material waste and optimizes the precise control of mold structure, thereby reducing energy consumption and meeting the requirements of energy conservation and environmental protection.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A jig for forming irregularly shaped powder metallurgy parts, characterized in that, include: The upper mold assembly includes an upper mold base, an upper mold core, and an upper mold pressure head; The lower mold assembly includes a lower mold base, a lower mold core, a first lower mold pad, and a second lower mold pad; The upper mold core, lower mold core, and female mold together define the mold cavity for forming the workpiece; The demolding mechanism includes ejector rods and demolding cylinders; The lower die base includes a fixed lower die plate and a movable lower die plate, and the lower die core includes a fixed lower die punch and a floating lower die punch; the fixed lower die punch is disposed on the fixed lower die plate, and the floating lower die punch is disposed on the movable lower die plate. The movable lower die plate has a protrusion on the side facing the fixed lower die plate, and the fixed lower die plate has a corresponding through hole for the protrusion to pass through. The first lower die pad is disposed between the fixed lower die plate and the upper die base, and the second lower die pad is disposed on the top surface of the protrusion. The movable lower die plate moves relative to the fixed lower die plate, and the second lower die pad abuts against the movable lower die plate and the upper die base to limit the movement distance of the floating lower die punch. The ejector rod is located inside the lower mold base, with one end connected to the bottom of the lower mold core and the other end extending out of the lower mold base and connected to the piston rod of the demolding cylinder.

2. The forming fixture for irregularly shaped powder metallurgy parts as described in claim 1, characterized in that... The upper mold base is a rectangular plate structure with a mounting hole on its top for connection with the press. It is fixedly connected to the slide block of the press by bolts.

3. The forming fixture for irregularly shaped powder metallurgy parts as described in claim 1, characterized in that... The upper mold core is fixedly installed at the bottom of the upper mold base, and the shape of the upper mold core matches the shape of the upper half of the spandex base.

4. The forming fixture for irregularly shaped powder metallurgy parts as described in claim 1, characterized in that... The upper die pressure head is located below the upper die core and can slide vertically on the upper die base.

5. The forming fixture for irregularly shaped powder metallurgy parts as described in claim 1, characterized in that... The lower mold base is a square base that is placed on the worktable of the press. Its bottom is provided with a positioning key that cooperates with the positioning groove on the worktable of the press.

6. The forming fixture for irregularly shaped powder metallurgy parts as described in claim 1, characterized in that... The lower die core is installed on the top of the lower die base, and the shape of the lower die core matches the shape of the lower half of the spandex base.

7. A powder metallurgy forming fixture for irregularly shaped workpieces as described in claim 1, characterized in that... The lower mold pad is located below the lower mold core and serves as a support and buffer.

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