Cold heading forming tool for thin-wall stainless steel lifting hook

Abstract

A cold heading forming tool for a thin-wall stainless steel lifting hook comprises a rear clamping die, a front clamping die and a rear clamping die, the middle clamping die comprises a left middle clamping table and a right middle clamping table, and forming grooves distributed around the workpiece are formed in the rear side of the left middle clamping table and the rear side of the right middle clamping table; the front top die comprises a first end provided with a first forming hole and a second end provided with a second forming hole, the first forming hole and the second forming hole are both conical holes, the taper of the first forming hole is larger than that of the second forming hole, and the first forming hole and the second forming hole correspond to the front portion of a workpiece. The front top die is used for making the first end or the second end abut against the middle clamping die and pushing the middle clamping die to move towards the rear clamping die. According to the scheme, stamping deformation of the conical head on the front portion of the workpiece and extrusion deformation of the annular boss in the middle of the workpiece can be achieved at the same time, and the machining efficiency is improved; and moreover, the probability that the front part of the workpiece is damaged or cracked by punching is greatly reduced, and the processing quality is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of tooling for processing tubular workpieces, and more specifically to a cold heading tooling for thin-walled stainless steel hooks. Background Technology

[0002] The manufacturing process of stainless steel hooks generally involves first producing a tubular blank. After clamping the front and rear of the blank using a front and rear clamping platform respectively, the platform is moved closer together, causing an annular boss to be extruded into the center of the blank. Then, a stamping die is used to stamp the front of the blank, creating a tapered head. However, under current processing methods, the blank requires two steps: extrusion deformation in the center and stamping deformation at the front. This results in low processing efficiency. Furthermore, because the tube wall of the blank is relatively thin, existing stamping dies are prone to damage or cracking when stamping the front, leading to a high defect rate. Utility Model Content

[0003] The purpose of this invention is to solve the problem that under the existing processing method, the blank part of the hook needs to be deformed by extrusion in the middle and stamping at the front in two steps, which results in low processing efficiency. Moreover, because the tube wall of the blank part is thin, the existing stamping die is prone to damage or cracking when stamping the front part of the blank part, resulting in a high defect rate.

[0004] To solve the above problems, this utility model provides a cold heading forming fixture for thin-walled stainless steel hooks, comprising:

[0005] The rear clamping mold, which is fixed in the front-back direction, includes a left rear clamping platform and a right rear clamping platform that can be clamped relative to each other, the left rear clamping platform and the right rear clamping platform being used to clamp the rear of the workpiece.

[0006] A middle clamping mold that can move in the front and back direction and is located in front of the rear clamping mold includes a left middle clamping platform and a right middle clamping platform that can be clamped relative to each other. The left middle clamping platform and the right middle clamping platform are used to clamp the middle part of the workpiece. The rear side of the left middle clamping platform and the rear side of the right middle clamping platform are provided with forming grooves distributed around the workpiece.

[0007] A front ejector die that moves in the front-back direction and is located in front of the middle clamping die. The front ejector die includes a first end with a first forming hole and a second end with a second forming hole. Both the first forming hole and the second forming hole are tapered holes, and the taper of the first forming hole is greater than that of the second forming hole. Both the first forming hole and the second forming hole correspond to the front part of the workpiece. The front ejector die is used to abut the first end or the second end to the middle clamping die and push the middle clamping die to move toward the rear clamping die.

[0008] In the above scheme, the rear part of the workpiece is clamped and fixed by the rear clamping mold, and the middle part of the workpiece is clamped by the middle clamping mold. During processing, the first end of the front ejector die is first turned toward the middle clamping mold and abuts against the front part of the workpiece through the first forming hole. The front ejector die moves backward under the action of external load and pushes the middle clamping mold to move toward the rear clamping mold until it abuts. At this time, on the one hand, the front part of the workpiece is roughly stamped into a conical head under the action of the first forming hole, and on the other hand, the middle part of the workpiece is squeezed into an annular boss at the position of the forming groove under the action of the middle clamping mold and the rear clamping mold. Then, the front ejector die is turned so that the second end is turned toward the middle clamping mold and abuts against the front part of the workpiece through the second forming hole. The front ejector die moves backward again under the action of external load, and the second forming hole further stamps and shapes the conical head of the front part of the workpiece. Compared with existing technologies, the above solution uses the front ejector die to drive the middle clamping die to move to the rear clamping die, thereby simultaneously achieving the stamping deformation of the tapered head at the front of the workpiece and the extrusion deformation of the annular boss in the middle, improving processing efficiency. Furthermore, the front ejector die performs stamping deformation on the tapered head at the front of the workpiece in two stages through the first forming hole and the second forming hole. Since the taper of the first forming hole is larger than that of the second forming hole, the first forming hole can first perform a pre-stamping deformation of the front of the workpiece with a relatively small deformation range, and then the second forming hole performs a secondary stamping deformation of the front of the workpiece with a relatively large deformation range. The stamping is performed in two stages, which greatly reduces the probability of the front of the workpiece being damaged or cracked, ensuring processing quality.

[0009] In an improved embodiment, both the left and right rear clamps are provided with positioning holes that extend through the left and right directions. The positioning holes of the left and right rear clamps are arranged opposite to each other and are used to slide with external guide posts, thereby achieving the guiding function of the left and right rear clamps when clamping or separating in the left and right directions through the positioning holes.

[0010] In an improved embodiment, the left and right rear clamps are provided with rear clamping grooves corresponding to the rear of the workpiece on their opposite surfaces, so that the left and right rear clamps can achieve stable clamping of the rear of the workpiece through the rear clamping grooves.

[0011] In an improved embodiment, the forming groove is formed along the vertical direction on the right side of the rear side of the left middle clamping platform and the left side of the rear side of the right middle clamping platform, thereby facilitating the processing of the forming grooves of the left and right middle clamping platforms.

[0012] In an improved embodiment, the width of the forming groove in the front-to-back direction corresponds to the thickness of the annular boss to be machined on the workpiece.

[0013] In an improved embodiment, the left and right center clamping platforms are provided with center clamping grooves corresponding to the center of the workpiece on their opposite surfaces, so that the left and right center clamping platforms can achieve stable clamping of the center of the workpiece through the center clamping grooves. Attached Figure Description

[0014] Figure 1 A schematic diagram of the finished workpiece to be processed using a cold heading tooling for a thin-walled stainless steel hook.

[0015] Figure 2 A schematic diagram of the overall cold heading forming fixture for a thin-walled stainless steel hook;

[0016] Figure 3 A top view schematic diagram of a cold heading forming fixture for a thin-walled stainless steel hook;

[0017] Figure 4 For along Figure 3 Cross-sectional view of section AA in the middle;

[0018] Figure 5 This is a schematic cross-sectional view of the front die of a cold heading tooling for a thin-walled stainless steel hook.

[0019] Explanation of reference numerals in the attached figures.

[0020] 1. Rear clamping mold; 11. Left rear clamping platform; 12. Right rear clamping platform; 13. Positioning hole; 14. Rear clamping groove; 2. Middle clamping mold; 21. Left middle clamping platform; 22. Right middle clamping platform; 23. Forming groove; 24. Middle clamping groove; 3. Front ejector mold; 31. First forming hole; 32. Second forming hole; 4. Workpiece; 41. Conical head; 42. Annular boss. Detailed Implementation

[0021] It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0022] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Please see Figures 2-5 The present invention provides a cold heading forming fixture for a thin-walled stainless steel hook, comprising:

[0026] The rear clamping mold 1, which is fixed in the front-back direction, includes a left rear clamping platform 11 and a right rear clamping platform 12 that can be clamped relative to each other. The left rear clamping platform 11 and the right rear clamping platform 12 are used to clamp the rear part of the workpiece 4.

[0027] The middle clamping mold 2, which can move in the front and back direction and is located in front of the rear clamping mold 1, includes a left middle clamping platform 21 and a right middle clamping platform 22 that can be clamped relative to each other. The left middle clamping platform 21 and the right middle clamping platform 22 are used to clamp the middle part of the workpiece 4. The rear side of the left middle clamping platform 21 and the rear side of the right middle clamping platform 22 are provided with forming grooves 23 distributed around the workpiece 4.

[0028] The front ejector mold 3, which moves along the front-back direction and is located in front of the middle clamping mold 2, includes a first end with a first forming hole 31 and a second end with a second forming hole 32. Both the first forming hole 31 and the second forming hole 32 are tapered holes, and the taper of the first forming hole 31 is greater than that of the second forming hole 32. Both the first forming hole 31 and the second forming hole 32 correspond to the front part of the workpiece 4. The front ejector mold 3 is used to abut the first end or the second end against the middle clamping mold 2 and push the middle clamping mold 2 to move toward the rear clamping mold 1.

[0029] Combination Figure 1As shown, in the above scheme, the rear part of the workpiece 4 is clamped and fixed by the rear clamping mold 1, and the middle part of the workpiece 4 is clamped by the middle clamping mold 2. During processing, the first end of the front ejector mold 3 is first turned toward the middle clamping mold 2, and the front part of the workpiece 4 is abutted through the first forming hole 31. The front ejector mold 3 moves backward under the action of external load, and pushes the middle clamping mold 2 toward the rear clamping mold 1 until it abuts. At this time, on the one hand, the front part of the workpiece 4 is roughly stamped into a conical head 41 under the action of the first forming hole 31, and on the other hand, the middle part of the workpiece 4 is squeezed into an annular boss 42 at the position of the forming groove 23 under the action of the middle clamping mold 2 and the rear clamping mold 1. Then, the front ejector mold 3 is turned so that the second end is turned toward the middle clamping mold 2, and the front part of the workpiece 4 is abutted through the second forming hole 32. The front ejector mold 3 moves backward again under the action of external load, and the second forming hole 32 further stamps and shapes the conical head 41 of the front part of the workpiece 4.

[0030] Compared with the prior art, the above solution uses the front top die 3 to drive the middle clamping die 2 to move towards the rear clamping die 1, thereby simultaneously realizing the stamping deformation of the tapered head 41 at the front of the workpiece 4 and the extrusion deformation of the annular boss 42 in the middle, which improves the processing efficiency. Furthermore, the front top die 3 performs stamping deformation on the tapered head 41 at the front of the workpiece 4 in two stages through the first forming hole 31 and the second forming hole 32. Since the taper of the first forming hole 31 is greater than that of the second forming hole 32, the first forming hole 31 can first perform a pre-stamping with a relatively small deformation amplitude on the front of the workpiece 4, and then the second forming hole 32 performs a secondary stamping deformation on the front of the workpiece 4 with a relatively large deformation amplitude. The stamping is performed in two stages, which greatly reduces the probability of the front of the workpiece 4 being damaged or cracked, and ensures the processing quality.

[0031] Specifically, in this embodiment, the front top mold 3 moves forward and backward via an external linear drive component such as a cylinder or hydraulic cylinder. The left rear clamping platform 11 and the right rear clamping platform 12 are fixed together after clamping. The specific fixing method is not limited in this design; for example, bolts in the left-right direction can be provided on the left rear clamping platform 11, and screw holes can be provided on the right rear clamping platform 12. The clamping and fixing or separation of the left rear clamping platform 11 and the right rear clamping platform 12 is achieved through the screwing connection of the bolts and screw holes. The left middle clamping platform 21 and the right middle clamping platform 22 are also fixed together after clamping. The specific fixing method is not limited in this design; for example, bolts in the left-right direction can be provided on the left middle clamping platform 21, and screw holes can be provided on the right middle clamping platform 22. The clamping and fixing or separation of the left middle clamping platform 21 and the right middle clamping platform 22 is achieved through the screwing connection of the bolts and screw holes.

[0032] like Figure 4As shown, in this embodiment, the left rear clamping platform 11 and the right rear clamping platform 12 are provided with rear clamping grooves 14 corresponding to the rear part of the workpiece 4 on their opposite surfaces. The rear clamping grooves 14 extend in the front-back direction and the shape of the rear clamping grooves 14 is adapted to the shape of the rear part of the workpiece 4. Thus, the left rear clamping platform 11 and the right rear clamping platform 12 achieve a stable clamping effect on the rear part of the workpiece 4 through the rear clamping grooves 14.

[0033] As an improvement to this embodiment, both the left rear clamp 11 and the right rear clamp 12 are provided with positioning holes 13 that extend in the left and right directions. The positioning holes 13 of the left rear clamp 11 and the right rear clamp 12 are arranged opposite to each other. The positioning holes 13 of the left rear clamp 11 and the right rear clamp 12 are used to slide and cooperate with the guide posts arranged in the left and right directions in the outside, so as to realize the guiding function of the left rear clamp 11 and the right rear clamp 12 when clamping or separating in the left and right directions through the positioning holes 13.

[0034] like Figure 4 As shown, in this embodiment, the left middle clamping platform 21 and the right middle clamping platform 22 are provided with a middle clamping groove 24 corresponding to the middle part of the workpiece 4 on their opposite surfaces. The middle clamping groove 24 extends along the front-middle direction and the shape of the middle clamping groove 24 is adapted to the shape of the middle part of the workpiece 4. Thus, the left middle clamping platform 21 and the right middle clamping platform 22 achieve a stable clamping effect on the middle part of the workpiece 4 through the middle clamping groove 24.

[0035] Combination Figure 3 and Figure 4 As shown, in this embodiment, the forming groove 23 is formed along the vertical direction on the right side of the rear side of the left middle clamping platform 21 and the left side of the rear side of the right middle clamping platform 22, thereby facilitating the processing of the forming groove 23 on the left middle clamping platform 21 and the right middle clamping platform 22. The width of the forming groove 23 in the front-back direction corresponds to the thickness of the annular boss 42 to be processed on the workpiece 4, thereby ensuring that the specifications of the annular boss 42 processed on the workpiece 4 meet the requirements.

[0036] It should be noted that in the description of this application, the terms "inner" and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. All directional indications (such as up, down, left, right, front, back, inner, and outer) are only used to explain the relative positional relationships and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cold-upsetting forming tool for a thin-walled stainless steel hanger, characterized by, include: The rear clamping mold (1) fixed in the front-back direction includes a left rear clamping platform (11) and a right rear clamping platform (12) that can be clamped relative to each other, the left rear clamping platform (11) and the right rear clamping platform (12) being used to clamp the rear of the workpiece (4); The middle clamping mold (2), which can move in the front and back direction and is located in front of the rear clamping mold (1), includes a left middle clamping platform (21) and a right middle clamping platform (22) that can be clamped relative to each other. The left middle clamping platform (21) and the right middle clamping platform (22) are used to clamp the middle part of the workpiece (4). The rear side of the left middle clamping platform (21) and the rear side of the right middle clamping platform (22) are provided with forming grooves (23) distributed around the workpiece (4). A front top mold (3) that can move in the front and back direction and is located in front of the middle mold (2) includes a first end with a first forming hole (31) and a second end with a second forming hole (32). The first forming hole (31) and the second forming hole (32) are both tapered holes and the taper of the first forming hole (31) is greater than that of the second forming hole (32). The first forming hole (31) and the second forming hole (32) are both corresponding to the front part of the workpiece (4). The front top mold (3) is used to abut the first end or the second end to the middle mold (2) and push the middle mold (2) to move toward the rear mold (1).

2. The cold-upsetting forming tool for a thin-wall stainless steel hanging hook according to claim 1, characterized in that, Both the left rear clamp (11) and the right rear clamp (12) are provided with positioning holes (13) that run through the left and right directions, and the positioning holes (13) of the left rear clamp (11) and the right rear clamp (12) are arranged opposite to each other.

3. The cold-upsetting forming tool for a thin-wall stainless steel hanging hook according to claim 1, characterized in that, The left rear clamp (11) and the right rear clamp (12) are provided with rear clamping grooves (14) corresponding to the rear of the workpiece (4) on their opposite sides.

4. The cold-upsetting forming tool for a thin-wall stainless steel hanging hook according to claim 1, characterized in that, The forming groove (23) is formed in the vertical direction on the right side of the rear side of the left middle clamp (21) and the left side of the rear side of the right middle clamp (22).

5. A cold-upsetting forming tool for thin-wall stainless steel hangers according to claim 1 or 4, characterized in that, The width of the forming groove (23) in the front-to-back direction corresponds to the thickness of the annular boss (42) to be machined on the workpiece (4).

6. The cold-upsetting forming tool for a thin-wall stainless steel hanging hook according to claim 1, characterized in that, The left middle clamping platform (21) and the right middle clamping platform (22) have a middle clamping groove (24) corresponding to the middle part of the workpiece (4) on their opposite sides.

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