High-specific-gravity alloy inserting and riveting type split hammer
Through the cold extrusion and riveting technology of high specific gravity tungsten-nickel alloy hammer body and copper alloy hammer plate, the assembly complexity and damage problems of split hammers are solved, and the effect of firm connection and detachability is achieved, reducing production costs.
Patent Information
- Application Number
- CN202422315476.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The assembly process of existing split hammers is complex and has high precision requirements, resulting in high defect rate and high production cost. The hammer body and hammer plate are easily damaged after assembly and cannot be reused.
The embedded groove design of high specific gravity tungsten-nickel alloy hammer body and copper alloy hammer plate is adopted, and the connection is achieved through cold extrusion and riveting. The hammer plate forms a convex edge fixing hammer body after cold extrusion, ensuring that the connection is firm and removable.
The firm connection between the hammer body and the hammer plate is achieved, which avoids assembly damage, reduces production costs and improves the reuse rate of the hammer body.
Smart Images
Figure CN223065654U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of mechanical automatic watch parts, in particular to a high specific gravity alloy inserted and riveted split hammer. Background Art
[0002] For a mechanical watch to keep running, a mainspring needs to continuously provide power for operation. The automatic hammer is an important functional and decorative part in the mechanical watch movement. An automatic mechanical watch uses the power generated by the left - right swing of the automatic hammer at the bottom of the movement to drive the mainspring. When the wearer moves the arm, the automatic hammer is affected by gravity and inertia and swings around the axis, thereby driving the automatic gear train to wind the mainspring.
[0003] The split hammer is a commonly used type of automatic hammer, which consists of an outer semi - circular high specific gravity tungsten - nickel alloy hammer body and an inner fan - shaped copper alloy thin hammer plate. Conventional split hammer assembly processes are generally riveting with rivets, snap - type riveting, spot welding, etc. Due to the complexity of the assembly process of the hammer body and the hammer plate and the high - precision requirements of the product, under the existing process level conditions, a certain defective rate is bound to occur during the assembly process, and the above - mentioned assembly methods will cause certain damage to the hammer body. If defects occur, both the hammer body and the hammer plate need to be scrapped, resulting in a relatively high production cost. Summary of the Utility Model
[0004] The purpose of the utility model is to overcome the deficiencies in the above - mentioned background art and provide a high specific gravity alloy inserted and riveted split hammer, which should have the characteristics of firm connection and detachable, so as to reduce the production cost.
[0005] The technical solution of the utility model is as follows:
[0006] A high specific gravity alloy inserted and riveted split hammer, including a semi - circular hammer body and a semi - circular hammer plate for fixing the hammer body; it is characterized in that: a groove is provided on the outer ring of the hammer plate; a flange for embedding into the groove is provided on the inner ring of the hammer body; the flange and the groove are riveted by cold extrusion.
[0007] A riveting groove is provided on the outer wall of the reverse side of the flange; after cold extrusion, the groove deforms and forms a convex edge embedded into the riveting groove to fix the flange embedded into the groove.
[0008] The thickness of the flange gradually decreases along the radial direction of the split hammer; the outer wall of the front side of the flange is parallel to the front of the hammer plate; the included angle between the outer wall of the reverse side of the flange and the front of the hammer plate is 5 - 10 degrees.
[0009] After cold extrusion, a number of concave points are formed on the outer - ring edge of the reverse side of the hammer plate.
[0010] The number of the concave points is 7 - 12.
[0011] The thickness of the inner edge of the flange is 0.17 - 0.3 mm.
[0012] The length that the flange extends out of the inner ring of the hammer body is 0.25 - 0.5 mm.
[0013] The fitting clearance between the outer edge of the flange and the groove is 0.02 - 0.05 mm.
[0014] The beneficial effects of the present utility model are as follows:
[0015] Since the connection method between the hammer body and the hammer plate is to first embed the flange into the groove and then use the cold extrusion method to deform the groove for riveting, the riveting quality can be guaranteed. And because the high specific gravity tungsten-nickel alloy material used for the hammer body has characteristics such as high hardness, the assembled hammer body will not be damaged and can be reused after disassembly, greatly reducing the scrap loss and lowering the production cost of the split hammer. Description of the Drawings
[0016] Figure 1 It is the front view structural schematic diagram of the present utility model.
[0017] Figure 2 It is the rear view structural schematic diagram of the present utility model.
[0018] Figure 3 It is the sectional structural schematic diagram of the present utility model.
[0019] Figure 4 It is Figure 3 The enlarged structural schematic diagram of part A in
[0020] Figure 5 It is the top view structural schematic diagram of the present utility model.
[0021] Figure 6 It is the rear view structural schematic diagram of the hammer body of the present utility model.
[0022] Figure 7 It is the enlarged sectional structural diagram of the flange of the present utility model.
[0023] Figure 8 It is the rear view structural schematic diagram of the hammer plate of the present utility model (after riveting).
[0024] Figure 9 It is the right view structural schematic diagram of the hammer plate of the present utility model (not riveted).
[0025] Figure 10 It is Figure 9 The enlarged structural schematic diagram of part B in
[0026] Reference Signs:
[0027] Hammer body 1, flange 1-1, front side outer wall 1-1-1, reverse side outer wall 1-1-2, riveting groove 1-2, hammer plate 2, groove 2-1, front side inner wall 2-1-1, reverse side inner wall 2-1-2, convex edge 2-2, concave point 2-3, fine finish surface 3. Detailed implementation mode
[0028] In order to make the purpose, technical solutions and advantages of the present 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 only used to explain the present utility model and are not used to limit the present utility model.
[0029] As Figure 1 , Figure 2 shown, a high specific gravity alloy plug-riveted split hammer includes a hammer body 1 on the outside and a hammer plate 2 on the inside. The outer circle of the hammer plate is fixed to the inner circle of the hammer body, and the split hammer is a semi-circular structure.
[0030] The hammer body is semi-circular and is made of high specific gravity tungsten-nickel alloy material, which is an existing material and has relatively high hardness. The hammer plate is semi-circular and is made of copper alloy material, which is an existing material.
[0031] The front side of the hammer plate is a fine finish surface 3 for decoration ( Figure 1 the side shown), and the other side is a non-fine finish surface ( Figure 2 the side shown).
[0032] The inner circle of the hammer body (the inner arc surface part of the semi-circular shape) is provided with a flange 1-1, and the outer circle of the hammer plate (the outer arc surface part of the semi-circular shape) is provided with a groove 2-1. The flange and the groove are fitted together and riveted by cold extrusion, so that the hammer body and the hammer plate are fixed together.
[0033] As Figure 7 shown, the shape of the flange is thick on the outside and thin on the inside, and the thickness of the flange gradually decreases along the radius direction of the split hammer. The closer to the inner circle of the hammer body ( Figure 7 below), the smaller the thickness of the flange. On the contrary, the farther away from the inner circle of the hammer body ( Figure 7 above), the larger the thickness of the flange.
[0034] The front side outer wall 1-1-1 of the flange (on the same side as the fine finish surface of the hammer plate) is parallel to the front side of the hammer plate, and the reverse side outer wall 1-1-2 of the flange forms a certain angle with the front side of the hammer plate, and this angle is 5-10 degrees. Therefore, the reverse side outer wall of the flange forms a riveting groove 1-2. As Figure 6 shown, the riveting groove is semi-circular.
[0035] The thickness of the inner edge of the flange (the side close to the inner ring of the hammer body) is 0.17 - 0.3 mm ( Figure 4 as shown by D2 in). The length of the flange extending out of the inner ring of the hammer body is 0.25 - 0.5 mm ( Figure 4 as shown by D1 in).
[0036] Before riveting, as shown in Figure 9 and Figure 10 , the groove is an equal-width groove, and the inner wall 2-1-1 on the front side of the groove is parallel to the inner wall 2-1-2 on the reverse side. When the flange is embedded in the groove, there is a certain gap between the outer wall on the reverse side of the flange and the inner wall on the reverse side of the groove.
[0037] During riveting, the die is pressed against the finishing surface, and the punch of the die is used to cold-extrude the outer ring edge on the reverse side of the hammer plate (corresponding to the position of the groove). Under the action of the punch, the hammer plate deforms, the inner wall on the reverse side of the groove bends inward to form a convex edge 2-2, and this convex edge is embedded in the riveting groove and tightly clamps the flange to prevent the hammer body from falling off from the hammer plate. At the same time, concave points 2-3 are formed on the outer ring edge on the reverse side of the hammer plate due to cold extrusion.
[0038] The number of the concave points is 7 - 12. As shown in Figure 8 , the number of the concave points is 9. Therefore, the die needs to be configured with the same number of punches for cold extrusion.
[0039] Because the hardness of the high-density tungsten-nickel alloy material used to manufacture the hammer body is much higher than that of the copper alloy material, after cold-extrusion riveting, the hammer plate deforms to clamp the hammer body, and the hammer body will not be damaged due to cold extrusion. When there is poor assembly, a special tooling can be used to separate the hammer body and the hammer plate, and the hammer body can be reused for reassembly. Therefore, the waste loss is reduced and the processing cost of the split hammer is lowered.
[0040] The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.
Claims
1. A high specific gravity alloy insert-riveted split hammer, comprising a semi-circular hammer body (1) and a semi-circular hammer plate (2) for fixing the hammer body; characterized in that: A groove (2-1) is provided on the outer ring of the hammer plate; a flange (1-1) for embedding in the groove is provided on the inner ring of the hammer body; the flange and the groove are riveted by cold extrusion.
2. The high specific gravity alloy insert riveting type split hammer according to claim 1, characterized in that: A riveting groove (1-2) is provided on the outer wall (1-1-2) on the reverse side of the flange; the groove is deformed after cold extrusion and forms a convex edge (2-2) embedded in the riveting groove to fix the flange embedded in the groove.
3. The high-specific gravity alloy insert-riveted split hammer according to claim 2, wherein: The thickness of the flange gradually decreases along the radial direction of the split hammer; the outer wall on the front side of the flange is parallel to the front of the hammer plate; the included angle between the outer wall on the reverse side of the flange and the front of the hammer plate is 5-10 degrees.
4. The high specific gravity alloy inserted rivet type split hammer according to claim 3, wherein: A number of concave points (2-3) are formed on the outer ring edge on the reverse side of the hammer plate after cold extrusion.
5. The high specific gravity alloy insert-riveted split hammer according to claim 4, characterized in that: The number of the concave points is 7-12.
6. The high specific gravity alloy inserted rivet type split hammer according to claim 5, characterized in that: The thickness of the inner edge of the flange is 0.17-0.3 mm.
7. The high specific gravity alloy insert-riveted split hammer according to claim 6, wherein: The length of the flange protruding from the inner ring of the hammer body is 0.25-0.5 mm.
8. The high specific gravity alloy insert-riveted split hammer according to claim 7, wherein: The clearance between the outer edge of the flange and the groove is 0.02-0.05 mm.