Horizontal trimming die for small-diameter part

Abstract

The utility model discloses a small-diameter part horizontal trimming die which comprises an upper die base and a lower die base, a middle positioning column is arranged on the lower die base and used for supporting the position of a part, a sliding base is arranged on the outer side of the middle positioning column, a sliding block is arranged on the sliding base in a sliding fit mode, and a side punching punch is arranged at the end, close to the middle positioning column, of the sliding block. The side punching puncher pin is matched with the bottom face of a part, and a driving puncher pin is arranged on the upper die base and is in sliding fit with the sliding block. When the die is closed, the upper die base drives the driving punch to move towards the sliding block, drives the sliding block to horizontally slide on the sliding base through the driving punch and drives the side punching punch to horizontally move to the position away from the middle positioning column from the position close to the middle positioning column so as to cut the edge of a part. By means of the mode, damage to the middle positioning column caused by stress concentration when parts on the middle positioning column are punched due to the fact that the internal space of the die is small and the strength of the middle positioning column is insufficient can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of metal trimming dies, and in particular to a horizontal trimming die for small diameter parts. Background Technology

[0002] In the field of machining, the horizontal trimming of small-diameter parts (such as cold-forged workpieces with an inner diameter of 33.4 mm, like ball teeth) faces significant technical challenges. These parts typically possess high strength characteristics (tensile strength approaching 400 MPa) and a large trimming thickness (up to 3.4 mm), making it difficult to directly apply traditional stamping dies. Due to the small part size and the extremely close distance between the trimming edge and the top (only 2.2 mm in some cases), if a traditional inward-punching die design is used, the insufficient strength of the central locating post can easily lead to stress concentration and damage, severely affecting die life and machining stability. Therefore, current technologies generally rely on machining methods such as CNC milling or electrical discharge machining (EDM) to complete the trimming process.

[0003] However, the aforementioned machining methods have significant drawbacks: First, CNC milling and EDM machining are inefficient, with long single-piece processing cycles, making it difficult to meet the demands of mass production; second, the high investment and operating costs of such equipment lead to a substantial increase in the overall manufacturing cost of parts, severely restricting the market competitiveness of products. Furthermore, the high reliance on manual operation further limits the potential for capacity expansion and cost optimization.

[0004] Although the industry has attempted to improve efficiency by optimizing toolpaths or enhancing EDM machining accuracy, the fundamental problem of edge trimming for high-strength, small-diameter parts has not been solved. There is an urgent need for a mold design solution that can replace traditional machining, combining high efficiency and economy to meet the mass production needs of high-strength, small-sized parts. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a horizontal cutting mold for small diameter parts, which can avoid damage to the intermediate positioning post caused by stress concentration when punching parts on the intermediate positioning post due to insufficient strength of the intermediate positioning post caused by the small internal space of the mold.

[0006] To solve the above-mentioned technical problems, the present invention provides a horizontal trimming mold for small-diameter parts, comprising: an upper mold base and a lower mold base. The lower mold base is provided with a central positioning post, which supports the position of the part. A slide block is provided on the outer side of the central positioning post, and a slider is slidably fitted on the slide block. A side punch is provided at one end of the slider near the central positioning post, and the side punch engages with the bottom surface of the part. A drive punch is provided on the upper mold base, and the drive punch engages with the slider. Thus, when the mold is closed, the upper mold base drives the drive punch to move toward the slider, and through the drive punch, drives the slider to slide horizontally on the slide block, and drives the side punch to move horizontally from a position near the central positioning post to a position away from the central positioning post to trim the part.

[0007] Preferably, a die cavity is provided on the lower die base, the die cavity is located outside the middle positioning post, and the die cavity has a concave surface around the outer edge of the part, the concave surface provides lateral support strength for the part.

[0008] Preferably, the middle positioning post has a punch groove. When the mold is opened, the end of the side punch near the middle positioning post is in the punch groove, which facilitates punching the cut edge of the bottom surface of the part when the mold is closed.

[0009] Preferably, a fixing plate is provided on the lower mold base, and a return spring is provided between the fixing plate and the slider. When the mold is opened, the return spring provides pressure to the slider to ensure that one end of the side punch is in the punch groove of the middle positioning post when the slider is not subjected to external force.

[0010] Preferably, the upper mold base is provided with an upper fixing sleeve, which has a relief hole. When the mold is closed, the upper fixing sleeve passes through the relief hole through the top of the part and abuts against the part on the middle positioning post, thereby stabilizing the position of the part on the positioning post.

[0011] Preferably, the side punch has a discharge slope, and the slider has a discharge hole that matches the discharge slope.

[0012] Preferably, the slider has a first inclined surface, and the end of the driving punch near the first inclined surface has a second inclined surface that cooperates with the first inclined surface. When the mold is closed, the second inclined surface of the driving punch gradually comes into contact with the first inclined surface of the slider and gradually forces the slider away from the intermediate positioning post.

[0013] Preferably, a limiting groove is provided on the side of the intermediate positioning post, and the limiting groove cooperates with the protrusion of the part to limit the circumferential position of the part on the intermediate positioning post.

[0014] The beneficial effects of this utility model are as follows: When trimming small-diameter and small-sized parts, due to the small space inside the mold, the size of the middle positioning post supporting the part cannot be increased, resulting in a weak strength of the middle positioning post. By punching the part from the inside out with the side punch, and setting a die on the outside of the part to increase the strength of the part support, the die can bear the impact force during punching, thereby avoiding the problem of excessive impact force on the middle positioning post when cutting from the outside in, which would cause the middle positioning post to be unable to withstand the force and be damaged. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial sectional view of the present invention;

[0017] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 4 This is a schematic diagram showing the positional relationship between the slider, the side punch, and the intermediate positioning post of this utility model;

[0019] Figure 5 This is an exploded structural diagram of the concave mold, intermediate positioning post, parts and upper fixing sleeve of this utility model.

[0020] The components in the attached diagram are labeled as follows:

[0021] 1. Upper die base; 11. Drive punch; 111. Second inclined surface; 12. Upper fixing sleeve;

[0022] 2. Lower mold base; 21. Fixing plate; 22. Return spring;

[0023] 3. Intermediate positioning post; 31. Punch groove; 32. Limiting groove;

[0024] 4. Slide;

[0025] 5. Slider; 51. First inclined plane; 52. Discharge hole;

[0026] 6. Side punch; 61. Cutter head; 62. Connecting part; 621. Discharge slope;

[0027] 7. Die cavity; 71. Concave surface;

[0028] 8. Parts. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this utility model, unless otherwise explicitly 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.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Unless otherwise specified, physical quantities in formulas should be understood as basic quantities of SI base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0036] Example:

[0037] refer to Figures 1-5 A horizontal trimming die for small-diameter parts includes: an upper die base 1 and a lower die base 2. A central positioning post 3 is fixedly connected to the lower die base 2 to support the position of part 8. A slide block 4 is arranged on the outer side of the central positioning post 3 and is fixedly connected to the lower die base 2. A slider 5 is slidably fitted on the slide block 4. A side punch 6 is bolted to one end of the slider 5 near the central positioning post 3 and engages with the bottom surface of part 8. A drive punch 11 is fixedly connected to the upper die base 1 and engages with the slider 5. Thus, when the die is closed, the upper die base 1 drives the drive punch 11 to move toward the slider 5, and the drive punch 11 drives the slider 5 to slide horizontally on the slide block 4, thereby moving the side punch 6 from a position near the central positioning post 3 to a position away from the central positioning post 3, thus trimming the bottom part of part 8.

[0038] refer to Figure 1 , Figures 3-5To enhance the support strength for part 8 during trimming, a die 7 is fixedly connected to the lower die base 2. The die 7 is positioned outside the central positioning post 3. A concave surface 71 is formed around the outer edge of part 8, fitting snugly against it. This provides lateral support to part 8, thereby increasing its support strength, ensuring the trimming effect, and preventing damage to the central positioning post 3 due to excessive force. To avoid affecting the displacement of the slider 5, a groove that mates with the slider 5 can be formed on the die 7.

[0039] refer to Figure 2 , Figure 4 , Figure 5 Since part 8 is a relatively small part, in order to cooperate with the side punch to cut the part 8 from the inside out during the cutting process and to provide room for the side punch 6 to move, the middle positioning post 3 is provided with a punch groove 31. When the mold is opened, the end of the side punch 6 near the middle positioning post 3 is in the punch groove 31, so that when the mold is closed, it is convenient for the side punch to cut the bottom surface of part 8.

[0040] refer to Figure 2 and Figure 3 In order to ensure that one end of the side punch 6 is returned to its original position when the mold is open, a fixed plate 21 is fixedly connected to the lower mold base 2. A return spring 22 is installed between the fixed plate 21 and the slider 5. The pressure of the return spring 22 on the slider 5 is directed towards the middle positioning post 3. Thus, when the mold is open, the return spring 22 provides pressure to the slider 5 to ensure that one end of the side punch 6 is in the punch groove 31 of the middle positioning post 3 when the slider 5 is not subjected to external force.

[0041] refer to Figures 2-5 In order to further fix the position of part 8 on the intermediate positioning post 3, and to make it more stable when trimming the edge of part 8, an upper fixing sleeve 12 is fixedly connected to the upper mold base 1. The upper fixing sleeve 12 has a relief hole, which can fit into the top of part 8 and make the fixing sleeve press part 8 tightly on the intermediate positioning post 3. When the mold is closed, the upper fixing sleeve 12 passes through the relief hole through the top of part 8 and abuts against part 8 on the intermediate positioning post 3, thereby stabilizing the position of part 8 on the positioning post.

[0042] refer to Figure 2 and Figure 4The side punch 6 includes a cutting head 61 and a connecting part 62. The cutting head 61 cuts the edge of the part 8. The side punch 6 is screwed to the slider 5 through the connecting part 62. The cutting head 61 extends into the punch groove 31. In order to discharge the waste material cut off during the cutting, a discharge slope 621 is provided on the connecting part 62 of the side punch 6. The discharge slope 621 is arranged below the cutting head 61. The slider 5 has a discharge hole 52 that matches the discharge slope 621. The lower die base 2 also has a hole that communicates with the discharge hole 52. Thus, the waste material cut off by the cutting head 61 falls directly onto the discharge slope 621 and falls along the discharge slope 621 into the discharge hole 52 for discharge and finally out of the mold.

[0043] refer to Figure 3 and Figure 4 The slider 5 has a first inclined surface 51, and the driving punch 11 has a second inclined surface 111 that cooperates with the first inclined surface 51 at one end near the first inclined surface 51. When the mold is closed, the upper mold base 1 drives the driving punch 11 to move vertically toward the lower mold base 2, so that the second inclined surface 111 of the driving punch 11 gradually fits with the first inclined surface 51 of the slider 5, thereby gradually forcing the slider 5 to move horizontally and gradually move away from the middle positioning post 3, so that the side punch 6 moves away from the middle positioning post 3 and cuts the part 8 from the inside out.

[0044] refer to Figure 5 A limiting groove 32 is provided on the side of the intermediate positioning post 3. The limiting groove 32 cooperates with the protrusion of the part 8 to limit the position or angle of the part 8 on the circumferential direction of the intermediate positioning post 3.

[0045] Operation process: When the mold is opened, the part 8 is transported to the middle positioning post 3. At this time, the cutting head 61 of the side punch 6 is in the punch groove 31 of the middle positioning post 3. Then the mold is closed. During the mold closing process, the driving punch 11 forces the slider 5 to move outward away from the middle positioning post 3 as it descends, and drives the cutting head 61 of the side punch 6 to cut the bottom edge of the part 8. The waste generated by cutting the edge falls directly onto the discharge slope 621 and falls into the discharge port hole, so that the waste is discharged without affecting the cutting edge.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A horizontal trimming die for small-diameter parts, characterized in that, include: The upper mold base (1) and the lower mold base (2) are provided with a middle positioning post (3) for supporting the position of the part (8). A slide block (4) is provided on the outer side of the middle positioning post (3). A slider (5) is slidably fitted on the slide block (4). A side punch (6) is provided at one end of the slider (5) near the middle positioning post (3). The side punch (6) fits with the bottom surface of the part (8). A drive punch (11) is provided on the upper mold base (1). The drive punch (11) is slidably fitted with the slider (5). Thus, when the mold is closed, the upper mold base (1) drives the drive punch (11) to move toward the slider (5) and drives the slider (5) to slide horizontally on the slide block (4) and drive the side punch (6) to move horizontally from the position near the middle positioning post (3) to the position away from the middle positioning post (3) to cut the edge of the part (8).

2. The horizontal trimming die for small-diameter parts according to claim 1, characterized in that: The lower mold base (2) is provided with a cavity mold (7), which is located outside the middle positioning post (3). The cavity mold (7) has a concave surface (71) around the outer edge of the part (8), and the concave surface (71) provides lateral support strength for the part (8).

3. The horizontal trimming die for small-diameter parts according to claim 2, characterized in that: The intermediate positioning post (3) has a punch groove (31). When the mold is opened, the side punch (6) is located in the punch groove (31) near the intermediate positioning post (3), which facilitates the punching of the bottom edge of the part (8) when the mold is closed.

4. A horizontal trimming die for small-diameter parts according to claim 3, characterized in that: A fixing plate (21) is provided on the lower mold base (2), and a reset spring (22) is provided between the fixing plate (21) and the slider (5). When the mold is opened, the reset spring (22) provides pressure to the slider (5) to ensure that when the slider (5) is not subjected to external force, one end of the side punch (6) is in the punch groove (31) of the middle positioning post (3).

5. A horizontal trimming die for small-diameter parts according to claim 1, characterized in that: The upper mold base (1) is provided with an upper fixing sleeve (12), and the upper fixing sleeve (12) has a clearance hole. When the mold is closed, the upper fixing sleeve (12) passes through the clearance hole to the top of the part (8) and abuts against the part (8) on the middle positioning post (3), thereby stabilizing the position of the part (8) on the positioning post.

6. A horizontal trimming die for small-diameter parts according to claim 1, characterized in that: The side punch (6) has a discharge slope (621), and the slider (5) has a discharge hole (52) that matches the discharge slope (621).

7. A horizontal trimming die for small-diameter parts according to claim 1, characterized in that: The slider (5) has a first inclined surface (51), and the driving punch (11) has a second inclined surface (111) that cooperates with the first inclined surface (51) at one end. When the mold is closed, the second inclined surface (111) of the driving punch (11) and the first inclined surface (51) of the slider (5) gradually come into contact and gradually force the slider (5) away from the intermediate positioning post (3).

8. A horizontal trimming die for small-diameter parts according to claim 1, characterized in that: The side of the intermediate positioning post (3) has a limiting groove (32), which cooperates with the protrusion of the part (8) to limit the circumferential position of the part (8) on the intermediate positioning post (3).

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