A large-stroke active stamping device for hot upsetting of fasteners

Abstract

This utility model relates to the field of fastener processing, specifically disclosing a large-stroke movable stamping device for hot upsetting of fasteners. The large-stroke movable stamping device includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base, a movable die sleeve, and an ejector pin. The movable die sleeve is movably fitted over the ejector pin. An upper limit mechanism is provided between the upper die base and the movable die sleeve. A preload spring is provided between the movable die sleeve and the upper die base or the ejector pin. The lower die assembly includes a lower die base, a forming die sleeve, and a support unit. The forming die sleeve has a forming cavity. The lower die base has a mounting hole aligned with and connected to the forming cavity. The support unit is located below the lower die base. By using a movable die sleeve, the large-stroke movable stamping device can laterally constrain the head material during hot upsetting, guiding the head material to be extruded and deformed into the forming cavity, thereby effectively improving forming quality and processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fastener processing, specifically to a large-stroke movable stamping device for hot upsetting of fasteners. Background Technology

[0002] Fasteners are a general term for mechanical parts used to fasten two or more parts together into a whole. Among them, threaded connection is the most common form of fastening connection, and bolts and screws are the most common types of fasteners.

[0003] Fasteners such as bolts and screws typically include a head, which is used for connection and axial positioning. During machining, the head structure of fasteners is usually formed by hot upsetting a single bar stock. This involves heating one end of the bar stock and then using a matching die to rough-form the head structure, a simple and convenient process.

[0004] For certain special connection applications, fasteners with larger head structures are required. Due to the larger head structure, the mold stroke during hot upsetting is longer, increasing the probability of lateral bending of the head material during hot upsetting, resulting in higher instability in molding quality. For larger head structures, a step-by-step molding process is typically used to shorten the hot upsetting stroke in each step, reducing the probability of lateral bending of the head material and improving the molding quality. However, step-by-step molding requires multiple sets of molds, and the product needs to be rotated between these sets, making the operation cumbersome. Furthermore, step-by-step processing inevitably leads to longer processing time and a greater overall drop in product head temperature, which also negatively impacts the hot upsetting quality.

[0005] The purpose of this application is to provide a stamping device that can perform hot forging in one step while ensuring forming quality for fasteners with large head structures. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a large-stroke movable stamping device for hot upsetting of fasteners. By setting a movable die sleeve, the head material can be laterally constrained during the hot upsetting process, and the head material can be guided to be squeezed and deformed into the forming cavity, thereby effectively improving the forming quality and processing efficiency.

[0007] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: A large-stroke movable stamping device for hot upsetting of fasteners, comprising at least:

[0008] The upper mold assembly includes an upper mold base, a movable mold sleeve, and an ejector pin. The ejector pin is fixedly disposed on the lower side of the upper mold base, and the movable mold sleeve is movably sleeved on the outside of the ejector pin. An upper limit mechanism is provided between the upper mold base and the movable mold sleeve to limit the range of motion of the movable mold sleeve along the axial direction of the ejector pin. A preload spring is provided between the movable mold sleeve and the upper mold base or the ejector pin. In its natural state, the lower end of the ejector pin is located inside the movable mold sleeve.

[0009] The lower mold assembly includes a lower mold base, a forming mold sleeve, and a support unit. The lower mold base is located below the upper mold base, and the forming mold sleeve is fixedly mounted on the upper side of the lower mold base. The forming mold sleeve has a forming cavity, which is vertically opposite to the ejector pin. The lower mold base has a vertically penetrating mounting hole, which is aligned with and communicates with the forming cavity. The support unit is located below the lower mold base and aligned with the mounting hole.

[0010] During the molding process, one end of the bar stock is heated and inserted into the mounting hole with the heated end facing upwards. The lower end of the bar stock contacts the support unit, while the upper end extends out of the molding cavity. The upper mold assembly then moves downwards. Since the lower end of the ejector pin is naturally located within the movable mold sleeve, the upper end of the bar stock first inserts into the movable mold sleeve. The bar stock then contacts the ejector pin and begins to deform and thicken under the combined pressure of the ejector pin and the support unit. After the movable mold sleeve contacts the molding mold sleeve, the ejector pin continues to move downwards within a certain range. Under the reverse force of the molding mold sleeve, the movable mold sleeve moves upwards relative to the ejector pin. Finally, the bar stock forms the predetermined head structure under the pressure of the ejector pin and the constraint of the inner cavity of the molding mold sleeve.

[0011] Since the bar stock has already entered the movable die sleeve before deformation begins, under the constraint of the movable die sleeve, the bar stock can stably deform axially into the forming cavity, greatly reducing the probability of lateral deformation. This can well adapt to the large stroke conditions required for forming larger head structures, effectively improving the forming quality of fastener heads.

[0012] Preferably, the preload spring is sleeved outside the ejector pin and located between the upper mold base and the movable mold sleeve.

[0013] Preferably, an upper pad is provided between the upper end of the ejector pin and the upper mold base; an annular stop is provided on the side of the ejector pin, and the annular stop is located near the upper end of the ejector pin; it also includes an ejector pin fixing block, which is sleeved on the outside of the ejector pin, and the upper end of the preload spring abuts against the ejector pin fixing block. Under the elastic force of the preload spring, the ejector pin fixing block presses against the annular stop and presses the ejector pin against the lower side of the upper pad.

[0014] The upper pad can reduce the pressure of the ejector pin on the upper mold base, while the ejector pin fixing block can cooperate with the preload spring to achieve the clamping and limiting of the ejector pin.

[0015] Preferably, the upper mold base includes an upper template and a fixed mold sleeve, the fixed mold sleeve is fitted over the movable mold sleeve and is connected to the upper mold base; the upper limit mechanism is disposed between the fixed mold sleeve and the movable mold sleeve.

[0016] The upper mold sleeve can realize the connection and limit between the movable mold sleeve, the ejector pin and the upper template.

[0017] Preferably, the upper limit mechanism includes a first limit block fixedly disposed inside the fixed mold sleeve and a second limit block fixedly disposed outside the movable mold sleeve; in its natural state, the movable mold sleeve is located at the lower limit position, the first limit block is in contact with the second limit block, and the first limit block is located below the second limit block.

[0018] Preferably, a gap is left between the fixed mold sleeve and the movable mold sleeve to form a cooling cavity; the fixed mold sleeve is provided with a cooling water channel communicating with the cooling cavity.

[0019] Because of the high temperatures during hot forging, various components are prone to expansion at high temperatures, especially the movable mold sleeves that need to move up and down. High-temperature deformation can easily cause the movable mold sleeves to jam, preventing normal processing. However, by setting up cooling chambers and cooling water channels, the movable mold sleeves can be cooled, controlling the deformation of each component within a reasonable range and ensuring smooth and reliable processing.

[0020] Preferably, the lower mold base includes a lower template and a guide mold sleeve. The guide mold sleeve is fitted over the forming mold sleeve and is fixedly connected to the lower template. The inner wall of the guide mold sleeve is provided with a guide ring, which extends to the top of the forming mold sleeve and presses against the forming mold sleeve.

[0021] The guide sleeve can limit the movement of the forming sleeve, ensuring a reliable connection between the forming sleeve and the lower template. Additionally, the guide ring can guide and constrain the downward movement of the movable sleeve during the forming process.

[0022] Preferably, a lower pad is provided between the forming mold sleeve and the lower template, and the lower pad is provided with a transition hole, which connects the mounting hole and the forming cavity.

[0023] The lower pad is used to position the lower end face of the head structure. For fasteners of different specifications, the lower pad can be replaced for processing.

[0024] Preferably, the inner diameter of the movable mold sleeve is not greater than the diameter of the forming cavity, the outer diameter of the movable mold sleeve is not greater than the inner diameter of the guide ring, and the diameter of the forming hole is smaller than the diameter of the forming cavity.

[0025] Preferably, the system also includes a discharge assembly, which includes a discharge seat and a discharge drive unit. The discharge drive unit is used to drive the discharge seat to move up and down. The support unit is disposed on the discharge seat.

[0026] After molding is completed, the unloading drive unit drives the unloading seat to move upward, and at the same time, it drives the finished fastener to move upward, so that the finished fastener can be taken out upward and the unloading can be conveniently achieved. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the large-stroke movable stamping device for hot upsetting of fasteners in this embodiment. At this time, the upper die assembly is in the initial state relative to the lower die assembly.

[0028] Figure 2 This is a schematic diagram of the upper die assembly in the large-stroke movable stamping device for hot upsetting of fasteners in this embodiment;

[0029] Figure 3 This is a schematic diagram of the lower die assembly in the large-stroke movable stamping device for hot upsetting of fasteners in this embodiment;

[0030] Figure 4 This is a schematic diagram of the large-stroke movable stamping device used for hot upsetting of fasteners in this embodiment, which is currently in the forming process.

[0031] Figure 5 This is a schematic diagram of the large-stroke movable stamping device used for hot upsetting of fasteners in this embodiment, which is currently in the completed forming state;

[0032] Figure 6 This is a schematic diagram of the large-stroke movable stamping device used for hot upsetting of fasteners in this embodiment, which is currently in the unloading state. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0034] like Figures 1-6 As shown, a large-stroke active stamping device for hot upsetting of fasteners includes an upper die assembly 1 and a lower die assembly 2.

[0035] like Figure 1 and Figure 2As shown, the upper mold assembly 1 includes an upper mold base, a movable mold sleeve 14, and an ejector pin 13. The upper mold base includes an upper template 11 and a fixed mold sleeve 12. The ejector pin 13 is fixedly disposed on the lower side of the upper template 11. The movable mold sleeve 14 is movably sleeved on the ejector pin 13, and the fixed mold sleeve 12 is sleeved on the movable mold sleeve 14, and the fixed mold sleeve 12 is connected to the upper mold base. The upper mold sleeve can realize the connection and limitation between the movable mold sleeve 14, the ejector pin 13, and the upper template 11.

[0036] like Figure 1 and Figure 2 As shown, an upper limit mechanism 19 is provided between the upper mold base and the movable mold sleeve 14. The upper limit mechanism 19 is used to limit the range of motion of the movable module along the axial direction of the ejector pin 13. A preload spring 10 is provided between the movable mold sleeve 14 and the upper mold base or ejector pin 13. In its natural state, the lower end of the ejector pin 13 is located inside the movable mold sleeve 14.

[0037] like Figure 1 and Figure 2 As shown, specifically, the upper limit mechanism 19 is disposed between the fixed mold sleeve 12 and the movable mold sleeve 14. The upper limit mechanism 19 includes a first limiting block fixedly disposed inside the fixed mold sleeve 12 and a second limiting block fixedly disposed outside the movable mold sleeve 14. In its natural state, the movable mold sleeve 14 is located at its lower limit position, the first limiting block is in contact with the second limiting block, and the first limiting block is located below the second limiting block.

[0038] like Figure 1 and Figure 2 As shown, specifically, the preload spring 10 is sleeved outside the ejector pin 13 and located between the upper mold base and the movable mold sleeve 14.

[0039] like Figure 1 and Figure 2 As shown, further, an upper pad 16 is provided between the upper end of the ejector pin 13 and the upper mold base; an annular stop is provided on the side of the ejector pin 13, and the annular stop is located near the upper end of the ejector pin 13. An ejector pin fixing block 15 is also included, which is sleeved on the outside of the ejector pin 13. The upper end of the preload spring 10 abuts against the ejector pin fixing block 15. Under the elastic force of the preload spring 10, the ejector pin fixing block 15 presses against the annular stop and presses the ejector pin 13 against the lower side of the upper pad 16. The upper pad 16 reduces the pressure of the ejector pin 13 on the upper mold base, while the ejector pin fixing block 15, in conjunction with the preload spring 10, achieves the pressing and limiting of the ejector pin 13.

[0040] like Figure 1 and Figure 2As shown, a gap is left between the fixed mold sleeve 12 and the movable mold sleeve 14, forming a cooling cavity 18; the fixed mold sleeve 12 is provided with a cooling water channel 17 communicating with the cooling cavity 18. Due to the high temperature during hot upsetting, various components are prone to expansion at high temperatures, especially the movable mold sleeve 14, which needs to move up and down. High-temperature deformation can easily cause the movable mold sleeve 14 to jam, preventing normal processing. By setting the cooling cavity 18 and the cooling water channel 17, the movable mold sleeve 14 can be cooled, controlling the deformation of each component within a reasonable range, ensuring smooth and reliable processing.

[0041] like Figure 1 and Figure 3 As shown, the lower mold assembly 2 includes a lower mold base, a forming mold sleeve 25, and a support unit 23. The lower mold base includes a lower template 22 and a guide mold sleeve 21. The lower mold base is located below the upper mold base. The forming mold sleeve 25 is fixedly mounted on the upper side of the lower mold base. The guide mold sleeve 21 is sleeved on the outside of the forming mold sleeve 25 and fixedly connected to the lower template 22. The forming mold sleeve 25 has a forming cavity 27, which is vertically opposite to the ejector pin 13. The lower mold base has a vertically penetrating mounting hole 28, which is aligned with and communicates with the forming cavity 27. The support unit 23 is located below the lower mold base and aligned with the mounting hole 28.

[0042] like Figure 1 and Figure 3 As shown, specifically, the inner wall of the guide sleeve 21 is provided with a guide ring 26, which extends above the forming sleeve 25 and presses against the forming sleeve 25. The guide sleeve 21 can limit the forming sleeve 25, realizing a reliable connection between the forming sleeve 25 and the lower template 22. In addition, the guide ring 26 can guide and constrain the downward movement of the movable sleeve 14 during the forming process.

[0043] like Figure 1 and Figure 3 As shown, specifically, a lower pad 24 is provided between the forming mold sleeve 25 and the lower template 22. The lower pad 24 has a transition hole 29, which connects the mounting hole 28 and the forming cavity 27. The lower pad 24 is used to position the lower end face of the head structure. For fasteners of different specifications, the lower pad 24 can be replaced for change processing.

[0044] like Figure 1 and Figure 3 As shown, specifically, the inner diameter of the movable mold sleeve 14 is not greater than the diameter of the forming cavity 27, the outer diameter of the movable mold sleeve 14 is not greater than the inner diameter of the guide ring 26, and the diameter of the forming hole is smaller than the diameter of the forming cavity 27.

[0045] During the forming process, one end of the bar stock 3 is heated and inserted into the mounting hole 28 with the heated end facing upwards. The lower end of the bar stock 3 contacts the support unit 23, and the upper end extends out from the forming cavity 27, i.e. Figure 1 As shown in the diagram. Then, the upper mold assembly 1 moves downwards. Since the lower end of the ejector pin 13 is located inside the movable mold sleeve 14 in its natural state, the upper end of the bar stock 3 first inserts into the movable mold sleeve 14. Then, the bar stock 3 contacts the ejector pin 13 and begins to deform and thicken under the combined pressure of the ejector pin 13 and the support unit 23, i.e., as shown in the diagram. Figure 4 As shown in the diagram. After the movable mold sleeve 14 contacts the forming mold sleeve 25, the ejector pin 13 continues to move downwards within a certain range. The bar stock 3 is ultimately formed into a pre-defined head structure 31 under the pressure of the ejector pin 13 and the constraint of the mold cavity within the forming mold sleeve 25, i.e., as shown in the diagram. Figure 5 The state shown.

[0046] Since the bar stock 3 has already been inserted into the movable mold sleeve 14 before the deformation begins, under the constraint of the movable mold sleeve 14, the bar stock 3 can stably deform axially into the forming cavity 27, greatly reducing the probability of lateral deformation and effectively improving the forming quality of the fastener head.

[0047] like Figure 1 As shown, furthermore, it also includes an unloading assembly, which includes an unloading seat 4 and an unloading drive unit. The unloading drive unit is used to drive the unloading seat 4 to move up and down; the support unit 23 is disposed on the unloading seat 4. After molding is completed, the unloading drive unit drives the unloading seat 4 to move upward, simultaneously driving the finished fastener upward, making it easy to remove the finished fastener upward, thus achieving convenient unloading, i.e. Figure 6 The state shown.

[0048] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A large stroke movable punch device for fastener hot upsetting, characterized by, At least including: The upper mold assembly includes an upper mold base, a movable mold sleeve, and an ejector pin. The ejector pin is fixedly disposed on the lower side of the upper mold base, and the movable mold sleeve is movably sleeved on the outside of the ejector pin. An upper limit mechanism is provided between the upper mold base and the movable mold sleeve to limit the range of motion of the movable mold sleeve along the axial direction of the ejector pin. A preload spring is provided between the movable mold sleeve and the upper mold base or the ejector pin. In its natural state, the lower end of the ejector pin is located inside the movable mold sleeve. The lower mold assembly includes a lower mold base, a forming mold sleeve, and a support unit. The lower mold base is located below the upper mold base, and the forming mold sleeve is fixedly mounted on the upper side of the lower mold base. The forming mold sleeve has a forming cavity, which is vertically opposite to the ejector pin. The lower mold base has a vertically penetrating mounting hole, which is aligned with and communicates with the forming cavity. The support unit is located below the lower mold base and aligned with the mounting hole.

2. The large stroke active ram press apparatus of claim 1, wherein: The preload spring is sleeved outside the ejector pin and located between the upper mold base and the movable mold sleeve.

3. The large stroke active ram press apparatus of claim 2, wherein: An upper pad is provided between the upper end of the ejector pin and the upper mold base; an annular stop is provided on the side of the ejector pin, and the annular stop is located near the upper end of the ejector pin; an ejector pin fixing block is also included, which is sleeved on the outside of the ejector pin, and the upper end of the preload spring abuts against the ejector pin fixing block. Under the elastic force of the preload spring, the ejector pin fixing block presses against the annular stop and presses the ejector pin against the lower side of the upper pad.

4. The large stroke active ram press apparatus of claim 1, wherein: The upper mold base includes an upper template and a fixed mold sleeve. The fixed mold sleeve is fitted over the movable mold sleeve and is connected to the upper mold base. The upper limit mechanism is disposed between the fixed mold sleeve and the movable mold sleeve.

5. The large stroke active ram apparatus of claim 4, wherein: The upper limit mechanism includes a first limit block fixedly disposed inside the fixed mold sleeve and a second limit block fixedly disposed outside the movable mold sleeve; in its natural state, the movable mold sleeve is located at the lower limit position, the first limit block is in contact with the second limit block, and the first limit block is located below the second limit block.

6. The large stroke active ram apparatus of claim 5, wherein: A gap is left between the fixed mold sleeve and the movable mold sleeve to form a cooling cavity; the fixed mold sleeve is provided with a cooling water channel that communicates with the cooling cavity.

7. The large stroke active ram apparatus of claim 1, wherein: The lower mold base includes a lower template and a guide mold sleeve. The guide mold sleeve is fitted over the forming mold sleeve and is fixedly connected to the lower template. The inner wall of the guide mold sleeve is provided with a guide ring, which extends to the top of the forming mold sleeve and presses against the forming mold sleeve.

8. The large stroke active ram apparatus of claim 7, wherein: A lower pad is provided between the forming mold sleeve and the lower template. The lower pad has a transition hole, which connects the mounting hole and the forming cavity.

9. The large stroke active ram apparatus of claim 8, wherein: The inner diameter of the movable mold sleeve is not greater than the diameter of the forming cavity, the outer diameter of the movable mold sleeve is not greater than the inner diameter of the guide ring, and the diameter of the forming hole is smaller than the diameter of the forming cavity.

10. The long-stroke active ram apparatus of any one of claims 1-9, wherein: It also includes a discharge assembly, which includes a discharge seat and a discharge drive unit. The discharge drive unit is used to drive the discharge seat to move up and down. The support unit is disposed on the discharge seat.

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