A flat riveting die

Abstract

A flat riveting die of the present invention is characterized in that it includes an upper die plate, a lower die plate, a support block, a positioning guide column, a punch fixing block, a punch, a nut placement block and a product fixing block; the upper die plate is connected to a punching device, the support block is fixedly arranged on the lower die plate, the positioning guide column is arranged between the upper die plate and the support block, the upper die plate is lifted and lowered relative to the support block through the positioning guide column, the punch fixing block is fixedly arranged on the upper die plate, the punch is fixedly arranged on the punch fixing block, the nut placement block is fixedly arranged on the support block, the punch faces the nut placement block, and the product fixing block is fixedly arranged on the lower die plate. It has the advantages of high nut fixing precision, convenient operation and simple structure.

Description

Technical Field

[0001] The invention relates to the technical field of tooling, in particular to a riveting die for a lower oil pan of an automobile engine. Background Art

[0002] The lower oil pan of a car engine is one of the many parts of a car. The lower oil pan of a car engine is usually formed by injection molding. After forming, a plurality of nuts are installed on the lower oil pan of a car engine. There are many ways to fix nuts in the prior art. However, no matter which fixing method is used, the fixed state of the nut must have a verticality of φ0.15 and a flatness of 0.1 within the range of φ35 (see the attached figure for details). Figure 1 and attached Figure 2 , wherein reference numeral 100 indicates the lower oil pan of an automobile engine, and reference numeral 200 indicates a nut).

[0003] Therefore, how to fix the nut so that it meets the above standards is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] One object of the present invention is to provide a flat riveting die with high nut fixing accuracy, convenient operation and simple structure.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a flat riveting die, characterized in that it includes an upper template, a lower template, a support block, a positioning guide column, a punch fixing block, a punch, a nut placement block and a product fixing block; the upper template is connected to a stamping device, the support block is fixedly arranged on the lower template, the positioning guide column is arranged between the upper template and the support block, the upper template is lifted and lowered relative to the support block through the positioning guide column, the punch fixing block is fixedly arranged on the upper template, the punch is fixedly arranged on the punch fixing block, the nut placement block is fixedly arranged on the support block, the punch faces the nut placement block, and the product fixing block is fixedly arranged on the lower template;

[0006] The nut placement block is used to place the nut, and the product fixing block is used to place the workpiece, and the workpiece extends between the punch and the nut placement block, so that the nut passes through the workpiece; the punch is aligned with the nut, and is pressed down by the upper template, so that the punch impacts the nut, and the end of the nut is deformed, so that the nut is riveted to the workpiece;

[0007] The punch end face is provided with a positioning column, the diameter of the positioning column is slightly smaller than the nut hole diameter, the positioning column and the nut are concentrically arranged, the positioning column is perpendicular to the nut end face, and the positioning column is perpendicular to the punch end face, and the contact surface between the punch end face and the nut end face is a flat surface.

[0008] As an improvement, a groove is provided at the contact point between the punch end face and the nut end face, and the periphery of the nut abuts against the inner wall of the groove. The main function of the groove design is to effectively shape the plane around the nut.

[0009] Preferably, the base of the positioning column is provided with an impact arc surface, which contacts the nut and causes the end of the nut to be turned outward, so that the deformation of the nut end surface is more orderly and the riveting effect is better.

[0010] Furthermore, the impact arc surface includes a convex arc surface and a concave arc surface arranged from the top to the root, and the convex arc surface and the concave arc surface are smoothly connected.

[0011] As an improvement, the top of the positioning column is provided with a chamfer, the angle of the chamfer is α, 172°≤α≤178°. The setting of the chamfer facilitates the positioning column to enter the nut.

[0012] Preferably, the chamfer angle α=175°.

[0013] Preferably, there are a plurality of product fixing blocks, each of which includes a product profiling block and an orientation block, the workpiece is placed close to the product profiling block, and the orientation block passes through the workpiece for positioning. The above structure facilitates the fixing of products.

[0014] Compared with the prior art, the advantages of the present invention are: the punch includes a positioning column design, which can be processed in one go according to the verticality and flatness requirements of the workpiece and the nut, and then the upper template needs to be controlled to reasonably control the stroke of the punch so that the punch can directly match the nut to ensure the verticality of the product. In addition, the present solution has the advantages of simple structure, convenient operation, high work efficiency, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 and Figure 2 It is a schematic diagram of the installation structure of the lower oil pan and the nut of the automobile engine according to the present invention;

[0016] Figure 3 is a schematic diagram of a three-dimensional structure according to a preferred embodiment of the present invention;

[0017] Figure 4 is a side view according to a preferred embodiment of the present invention;

[0018] Figure 5 is a front view according to a preferred embodiment of the present invention;

[0019] Figure 6 is a schematic diagram of a three-dimensional structure of a punch according to a preferred embodiment of the present invention;

[0020] Figure 7 is a partial cross-sectional view of a punch according to a preferred embodiment of the present invention;

[0021] Figure 8 According to a preferred embodiment of the present invention Figure 7 Magnified view of the cross-section. DETAILED DESCRIPTION

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0023] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0024] like Figures 3 to 8 As shown, a preferred embodiment of the present invention includes an upper template 1, a lower template 2, a support block 3, a positioning guide column 4, a punch fixing block 5, a punch 6, a nut placement block 7 and a product fixing block 8; the upper template 1 is connected to the stamping device, the support block 3 is fixedly arranged on the lower template 2, the positioning guide column 4 is arranged between the upper template 1 and the support block 3, the upper template 1 is raised and lowered relative to the support block 3 through the positioning guide column 4, the punch fixing block 5 is fixedly arranged on the upper template 1, the punch 6 is fixedly arranged on the punch fixing block 5, the nut placement block 7 is fixedly arranged on the support block 3, the punch 6 faces the nut placement block 7, and the product fixing block 8 is fixedly arranged on the lower template 2.

[0025] The nut placement block 7 is used to place the nut 200, and the product fixing block 8 is used to place the workpiece 100 (the workpiece in this embodiment is the lower oil pan of the automobile engine), and the workpiece 100 extends between the punch 6 and the nut placement block 7, so that the nut 200 passes through the workpiece 100; the punch 6 is aligned with the nut 200, and is pressed down through the upper template 1, so that the punch 6 impacts the nut 200, and the end of the nut 200 is deformed, thereby riveting the nut 200 to the workpiece 100.

[0026] A positioning column 61 is provided on the end face of the punch 6. The diameter of the positioning column 61 is slightly smaller than the hole diameter of the nut 200. The positioning column 61 and the nut 200 are concentrically arranged. The positioning column 61 is perpendicular to the end face of the nut 200, and the positioning column 61 is perpendicular to the end face of the punch 6. The contact surface between the end face of the punch 6 and the end face of the nut 200 is a flat surface.

[0027] The positioning column 61 is designed as follows: a groove 62 is provided at the contact point between the end face of the punch 61 and the end face of the nut 200, and the periphery of the nut 200 contacts the inner wall of the groove 62. An impact arc surface 63 is provided at the root of the positioning column 61, and the impact arc surface 63 contacts the nut 200 and causes the end of the nut 200 to be turned outward. The impact arc surface 63 includes a convex arc surface 631 and a concave arc surface 632 arranged from the top to the root, and the convex arc surface 631 and the concave arc surface 632 are smoothly connected. A chamfer 64 is provided at the top of the positioning column 61, and the angle of the chamfer 64 is α, and α=175°.

[0028] In addition, for the convenience of fixing, there are multiple product fixing blocks 8, each of which includes a product profiling block 81 and an orienting block 82. The workpiece 100 is placed close to the product profiling block 81, and the orienting block 82 passes through the workpiece 100 for positioning.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A flat riveting die, characterized in that: It comprises an upper template, a lower template, a support block, a positioning guide column, a punch fixing block, a punch, a nut placement block and a product fixing block; the upper template is connected to a punching device, the support block is fixedly arranged on the lower template, the positioning guide column is arranged between the upper template and the support block, the upper template is lifted and lowered relative to the support block through the positioning guide column, the punch fixing block is fixedly arranged on the upper template, the punch is fixedly arranged on the punch fixing block, the nut placement block is fixedly arranged on the support block, the punch faces the nut placement block, and the product fixing block is fixedly arranged on the lower template; The nut placement block is used to place the nut, and the product fixing block is used to place the workpiece, and the workpiece extends between the punch and the nut placement block, so that the nut passes through the workpiece; the punch is aligned with the nut, and is pressed down by the upper template, so that the punch impacts the nut, and the end of the nut is deformed, so that the nut is riveted to the workpiece; The punch end face is provided with a positioning column, the diameter of the positioning column is slightly smaller than the nut hole diameter, the positioning column and the nut are concentrically arranged, the positioning column is perpendicular to the nut end face, and the positioning column is perpendicular to the punch end face, and the contact surface between the punch end face and the nut end face is a flat surface; A groove is provided at the contact point between the punch end face and the nut end face, and the periphery of the nut abuts against the inner wall of the groove; The base of the positioning column is provided with an impact arc surface, and the impact arc surface contacts the nut and causes the end of the nut to turn outward; The impact arc surface includes a convex arc surface and a concave arc surface arranged from the top to the root, and the convex arc surface and the concave arc surface are smoothly connected.

2. A flat riveting die according to claim 1, characterized in that: A chamfer is arranged on the top of the positioning column, and the angle of the chamfer is α, 172°≤α≤178°.

3. A flat riveting die according to claim 2, characterized in that: The chamfer angle α=175°.

4. A flat riveting die according to any one of claims 1 to 3, characterized in that: There are a plurality of product fixing blocks, each of which comprises a product profiling block and an orienting block. The workpiece is placed close to the product profiling block, and the orienting block passes through the workpiece for positioning.

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