Powder metallurgy inner hole extrusion forming tooling
By separating the forming process and performing secondary processing of the inner hole guide cone extrusion bar, the problem that powder metallurgy cannot form guide cone inner holes has been solved, realizing diversified inner hole shape forming and high-precision processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI JIASHENG AUTO PARTS CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-21
AI Technical Summary
Existing powder metallurgy technology cannot directly form products with guide tapers and internal holes, which limits its application in specific products.
The process employs a separation molding process. First, a vertical inner hole base product is manufactured using traditional powder metallurgy. Then, an inner hole guide cone extrusion bar is used for secondary processing under the action of a pneumatic punch to form the required guide cone.
It enables the molding of various shaped guide tapered inner hole products, improving molding accuracy and flexibility.
Smart Images
Figure CN224525994U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of powder metallurgy technology, specifically to a powder metallurgy internal hole extrusion molding tool. Background Technology
[0002] Powder metallurgy parts are increasingly used in the automotive industry due to their numerous advantages, but some inherent characteristics also limit the application of powder metallurgy technology. The powder metallurgy forming principle is designed based on the stamping principle, which requires that the axial inner hole must remain vertical. Products with a guide taper at the axial upper opening cannot be directly formed.
[0003] To address the aforementioned issues, we have made a series of improvements. Utility Model Content
[0004] The purpose of this invention is to provide a powder metallurgy internal hole extrusion molding tool to overcome the above-mentioned shortcomings and deficiencies of the prior art.
[0005] A powder metallurgy internal hole extrusion forming tooling includes: a pneumatic cylinder upper press head template, an extrusion rod cover, an internal hole guide cone extrusion rod, a product pad, and a lower support plate for the pad. The top of the pneumatic cylinder upper press head template is connected to a pneumatic punch press, and the bottom of the pneumatic cylinder upper press head template is connected to the internal hole guide cone extrusion rod through the extrusion rod cover. The product pad is fixed on the lower support plate for the pad, and the product pad is equipped with an internal hole guide cone when in use.
[0006] The beneficial effects of this utility model are:
[0007] Compared with traditional technologies, this invention, through the design of extrusion molding tooling, can realize inner hole products with guide tapers of various shapes. Attached image description:
[0008] Figure 1 This is a schematic diagram of the structure of this utility model.
[0009] Figure label:
[0010] The cylinder upper pressure head template 100, the extrusion bar cover 200, the inner hole guide cone extrusion bar 300, the product pad 400, and the pad lower support plate 500.
[0011] Pneumatic punch press 1 and internal hole guide taper product 2. Detailed Implementation
[0012] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.
[0013] Example 1
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] like Figure 1 As shown, a powder metallurgy internal hole extrusion forming tooling includes: a pneumatic cylinder upper press head template 100, an extrusion rod cover 200, an internal hole guide cone extrusion rod 300, a product pad 400, and a pad lower support plate 500. The top of the pneumatic cylinder upper press head template 100 is connected to a pneumatic punch press 1, and the bottom of the pneumatic cylinder upper press head template 100 is connected to the internal hole guide cone extrusion rod 300 through the extrusion rod cover 200. The product pad 400 is fixed on the pad lower support plate 500, and the product pad 400 is equipped with an internal hole guide cone product 2 when in use.
[0016] The core limitation of traditional powder metallurgy forming processes lies in the fact that, based on the stamping principle, only vertical inner holes can be formed, and it is impossible to directly form inner holes with guide tapers. The purpose of this invention is to improve the traditional production process into a separate forming process, that is, to divide the manufacturing process into two independent stages: an initial forming stage and a subsequent extrusion stage. In the initial forming stage, a basic product with a vertical inner hole is first manufactured using traditional powder metallurgy technology; at this point, the product already possesses a basic shape and strength. In the subsequent extrusion stage, a newly added structural inner hole guide taper extrusion bar 300 is used. Through the pressure provided by a pneumatic punch press, the inner hole of the already formed product is further processed. The tapered portion of the extrusion bar changes the shape of the inner hole under pressure, forming the required guide taper.
[0017] The principle is as follows: the geometry of the extrusion rod perfectly matches the desired inner bore taper. Therefore, the specific shape of the extrusion end of the extrusion rod is not fixed and is not within the scope of this invention; it is changed according to actual needs. Under pressure, the extrusion rod enters the inner bore of the product. Due to the plasticity of powder metallurgy materials, the inner bore wall undergoes plastic deformation under pressure. The deformed inner bore shape matches the shape of the extrusion rod, forming the required taper.
[0018] The process is as follows: First, the inner hole guide cone extrusion rod 300 is installed on the upper press head template 100 of the pneumatic cylinder through the extrusion rod cover 200. Then, the product pad 400 is fixed on the lower support plate 500 of the pad. Next, the inner hole guide cone product 2 is placed into the product pad 400. Then, the inner hole guide cone extrusion rod 300 enters the product extrusion through the upper cylinder press head of the pneumatic punch press 1. Finally, the inner hole guide cone extrusion rod 300 returns upward and the product is taken out.
[0019] The connection design between the pneumatic cylinder upper pressure head template 100 and the extrusion bar cover 200 of this utility model achieves efficient pressure transmission and uniform distribution. This design ensures that during the extrusion process, the force can be accurately transmitted along a predetermined path to the inner guide cone extrusion bar 300, avoiding force deviation and loss, thereby guaranteeing molding accuracy.
[0020] Compared with traditional technologies, this invention, through the design of extrusion molding tooling, can realize inner hole products with guide tapers of various shapes.
[0021] The specific embodiments of this utility model have been described above, but this utility model is not limited thereto. Various changes can be made to this utility model as long as they do not depart from its spirit.
Claims
1. A powder metallurgy internal hole extrusion forming tooling, characterized in that, include: The pneumatic cylinder upper press head template (100), extrusion rod cover (200), inner hole guide cone extrusion rod (300), product pad (400) and pad lower support plate (500) are provided. The top of the pneumatic cylinder upper press head template (100) is connected to the pneumatic punch press (1), and the bottom of the pneumatic cylinder upper press head template (100) is connected to the inner hole guide cone extrusion rod (300) through the extrusion rod cover (200). The product pad (400) is fixed on the pad lower support plate (500). When in use, the product pad (400) is equipped with an inner hole guide cone product (2).