A punch main die ejection structure
Patent Information
- Application Number
- CN202520756166.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-04-21
AI Technical Summary
因此，这种脱模方式会导致工件表面产生划痕，尤其是沉台21所对应的圆弧处，其成型面极易在强脱时受损
本实用新型所提供的一种冲压主模顶出结构，通过将顶杆设计为分体式结构，使得工件先通过顶杆构件进行预脱模工序，然后利用分体式的第一顶杆实施二次脱模，并且这种嵌套的分体结构也不会大规模增加主模的体积，以达到改善零件表面质量的目的。
Smart Images
Figure CN224712900U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fastener stamping, and in particular to a stamping main die ejection structure. Background Technology
[0002] In metal stamping processes, the ejector structure of precision workpieces with bosses and center holes typically employs an integral ejector pin design, especially in cases such as... Figure 1 The workpiece shown has several edges and rounded transitions on its outer surface. Existing demolding methods involve... Figure 2 A push rod 24 inside the main mold 20 acts simultaneously on the boss 2 and the hole 3 to eject the workpiece 1 from the main mold 20 in one go. Because the workpiece is squeezed between itself and the main mold cavity during the molding process, it needs to overcome significant friction during movement. Therefore, this demolding method can cause scratches on the workpiece surface, especially at the arc corresponding to the countersunk platform 21, where the molding surface is easily damaged during forceful demolding. Utility Model Content
[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide a stamping main die ejection structure to improve the surface forming quality of the workpiece.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A stamping main die ejection structure is characterized by comprising a split asynchronous ejector rod disposed inside the main die, wherein the split asynchronous ejector rod is positioned on the lower side of the workpiece to provide support for the bottom of the workpiece, and ejects the workpiece from the main die in multiple steps during demolding.
[0005] Furthermore, the split asynchronous push rod consists of a first push rod and a central push rod slidably disposed within the first push rod. The first push rod is supported by a first base at its bottom, and the central push rod passes through the first base and is connected to a second base at the bottom of the first base for support. The first base is used to drive the first push rod to move, and the second base is used to drive the central push rod to move.
[0006] Furthermore, one end of the axial push rod has a limiting portion, which is clamped between the first base and the second base and can only move between the first base and the second base.
[0007] Furthermore, it also includes at least three second push rods, which pass through the first base and the second base and connect to the bottom of the first push rod. The second push rods are used to independently drive the first push rod to move.
[0008] Furthermore, the second push rod is evenly distributed around the central push rod.
[0009] The beneficial effects of this utility model are as follows: The present invention provides a stamping main die ejection structure, which designs the ejector pin as a split structure, so that the workpiece first undergoes a pre-demolding process through the ejector pin component, and then a secondary demolding is performed using the split first ejector pin. Moreover, this nested split structure does not significantly increase the volume of the main die, thereby improving the surface quality of the parts. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0011] Figure 1 This is a schematic diagram of the workpiece involved in this utility model.
[0012] Figure 2 This is a cross-sectional schematic diagram of the main mold section of the existing mold.
[0013] Figure 3 This is an exploded view of the main mold part of this utility model. Detailed Implementation
[0014] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The above description is for the purpose of simplifying the description of this utility model and does not indicate or imply that the device or element referred to 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 utility model.
[0015] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature, but do not exclude the presence of one or more other features.
[0016] When a component is described in the specification as being "on", "fixed" to, "connected" to, or "joined" to another component, the component may be directly located on, fixed to, connected to, joined to, or in contact with the other component, or there may be an intermediate component present.
[0017] It is understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Therefore, a first element may be referred to as a second element without departing from the teachings of this application.
[0018] Exemplary embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that this application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments. Throughout the drawings, the same reference numerals denote the same or functionally identical elements.
[0019] Figure 3 The improved structure of this stamping master die is shown, including a first ejector pin 24a, a central ejector pin 25, and a second ejector pin 24c, all inserted within the master die 20. The first ejector pin 24a is sleeved around the central ejector pin 25 and placed together at the bottom of the workpiece 1. The first ejector pin 24a contacts the end of the boss 2 on the workpiece 1 and provides support during stamping. The central ejector pin 25 is inserted into the hole 3 in the workpiece 1, maintaining its lateral orientation during stamping and ensuring stable forming of the boss 2. The first ejector pin 24a has a bottom 27 with an outer diameter significantly larger than the main body. Through the bottom 27, the first ejector pin 24a can be stably mounted on the first base 23a and ejects the workpiece 1 as the first base 23a moves. A through hole 24b is provided at the axis of the first ejector pin 24a. A second base 23c is also provided below the first base 23a. The central ejector pin 25 passes through the first base 23a and slidably inserts into the first ejector pin 24a via the through hole 24b. The axial ejector pin 25 also has a bottom 26 with an outer diameter larger than that of the main body. The axial ejector pin 25 is supported on the second base 23c by the bottom 26. In addition, the bottom 26 serves as a limiting part for the axial ejector pin 25, allowing it to move only between the first base 23a and the second base 23c. Through holes 23b and 23d are correspondingly provided on both the first base 23a and the second base 23c. The second ejector pin 24c passes through the through holes 23b and 23d and connects to the bottom 27. This structure allows the ejector mechanism located at the bottom of the workpiece 1 to eject the workpiece 1 from the main mold 20 asynchronously and separately.
[0020] In one embodiment, the number of second push rods 24c is at least three, which are evenly distributed around the axis of the bottom 27.
[0021] During demolding, the first base 23a and the second base 23c move upwards synchronously to slightly push the workpiece 1 out of the main mold 20; then, the second ejector pin 24c is driven to further move the first ejector pin 24a. At this point, since the workpiece 1 has become detached from the main mold 20, the first ejector pin 24a acts on the boss 2 to push the entire workpiece 1 out of the mold cavity. The advantage of this split asynchronous ejector pin structure is that the first ejector pin 24a and the axial ejector pin 25 first perform pre-demolding on the workpiece 1 to prevent the workpiece 1 from moving too far at once in a demolding sequence and scratching the surface, before completely ejecting the workpiece 1. This nested split structure also does not significantly increase the volume of the main mold 20.
Claims
1. A stamping main die ejection structure, characterized in that, The device includes a split asynchronous ejector rod installed inside the main mold. The split asynchronous ejector rod is placed on the lower side of the workpiece to provide support for the bottom of the workpiece. When the workpiece is demolded, it ejects the workpiece from the main mold in multiple steps.
2. The stamping main die ejection structure as described in claim 1, characterized in that, The split asynchronous push rod consists of a first push rod and a central push rod slidably disposed inside the first push rod. The first push rod is supported by a first base at its bottom. The central push rod passes through the first base and is connected to a second base at the bottom of the first base for support. The first base is used to drive the first push rod to move, and the second base is used to drive the central push rod to move.
3. The stamping master die ejection structure as described in claim 2, characterized in that, One end of the shaft push rod has a limiting part, which is clamped between the first base and the second base and can only move between the first base and the second base.
4. The stamping main die ejection structure as described in claim 2, characterized in that, It also includes at least three second push rods, which pass through the first base and the second base and connect to the bottom of the first push rod. The second push rods are used to independently drive the first push rod to move.
5. The stamping master die ejection structure as described in claim 4, characterized in that, The second push rod is evenly distributed around the central push rod.