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Method for processing exhaust pipe flange and special die thereof

A processing method and mold technology, applied in the field of mechanical processing, can solve the problems of high cost, long processing time, low production efficiency, etc., and achieve the effect of saving processing cost, saving time and simple structure.

Inactive Publication Date: 2014-06-25
武汉精立仁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of long processing time, high cost and low production efficiency of the existing automobile exhaust pipe flange, the present invention proposes a processing method of the automobile exhaust pipe flange with simple process and high processing efficiency and special mold

Method used

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  • Method for processing exhaust pipe flange and special die thereof
  • Method for processing exhaust pipe flange and special die thereof
  • Method for processing exhaust pipe flange and special die thereof

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Embodiment Construction

[0023] The processing method of the automobile exhaust pipe flange of the present invention is all processed by the method of die stamping, without turning machining allowance. The specific process is as follows: blanking - punching - pumping - shaping rounded corners - reverse extrusion and whole platform - secondary punching.

[0024] In the blanking process, the general blanking mold is used to blank according to the product structure.

[0025] In the punching process, a general punching die is used to punch out the central hole and the assembly hole.

[0026] Hole pumping process, the main process parameters are adjusted by the general hole pumping die; the main process parameters are: the inner diameter of the central hole Φ54.00±0.05mm, the outer diameter of the turned hole Φ65.00±0.05mm, and the rounded corner of the outer contour R2 ±0.5mm, the bottom fillet radius of the inner hole of the central hole is R0.3±0.05mm. After the hole is drawn, the bottom of the produc...

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Abstract

The invention relates to a method for processing an exhaust pipe flange and a special die thereof. The method utilizes a die to stamp, and dose not need lathe machining allowance. An insert which is sleeved at the periphery of an extruded punch is embedded in a stripper plate of the special die; and an insert end surface which is contacted with a workpiece is inwards concave to form a groove which is matched with a hole flanging of the workpiece. According to the method, lath machining is omitted, the die is directly used to stamp and form, through adjusting the technological parameters of a hole drawing process and the special die, the manner adopting a similar trimming structure to form is creatively proposed, so the working hours and processing cost are saved, and the production efficiency is improved. The special die has a simple structure, and solves the problem that the external diameter becomes larger during the reverse extruding process, and accordingly, the method of the invention is ensured to be realized.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a flange processing method, in particular to a processing method of an automobile exhaust pipe flange and a special mold used in the method. Background technique [0002] Automobile exhaust pipe flange, the material thickness is 9mm, the overall size is 107mmX112.5mm, the material is SPHE, and the structure is as follows figure 1 As shown, there is a central hole 1 and three evenly distributed assembly holes 2. The central hole 1 is an inner stepped hole. It is required that the inner hole 11 of the central hole 1 has a diameter of Φ55.00±0.05mm, and the inner hole 12 has a diameter of Φ58 .60±0.05mm, the surface finish of the inner hole is required, and the 12 steps of the inner hole are required to be less than R0.3mm. More than 90%, no burrs. [0003] For the processing of automobile exhaust pipe flanges, die stamping and lathe additional processing are generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D35/00B21D28/24B21D28/34
Inventor 李才富
Owner 武汉精立仁科技有限公司
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