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Flange die-forging technology

A die forging and process technology, which is applied in the field of flange die forging technology, can solve problems such as pits and double drums on the end face of the flange, and achieve the effects of reducing work hardening, ensuring uniformity, and eliminating cracks

Inactive Publication Date: 2017-05-24
重庆市合川区通用汽车配件制造厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the existing die forging process easily leads to double drums or pits on the end face of the flange, the present invention provides a flange die forging process

Method used

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Embodiment Construction

[0017] Describe in detail below in conjunction with specific embodiment according to accompanying drawing:

[0018] A flange die forging process, comprising the following steps:

[0019] S1: blanking;

[0020] S2: Preheating the forging die, the preheating temperature is 200°C-250°C;

[0021] S3: the first stage of die forging, the initial forging temperature of the die forging is 1100°C-1200°C, and the cooling time between the first stage of die forging is 18s-20s;

[0022] S3: the second stage of die forging, the temperature of the forging is 700°C-800°C, and the cooling time between the two stages of die forging is 9s-11s;

[0023] S4: Flip and cut the skin;

[0024] S5: annealing, the annealing temperature is 1150°C-1250°C;

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Abstract

A flange is an important component for mechanical connection. For certain cast iron class of flanges, casing molding is generally adopted, but the service life of the class of flanges is not long. At present, in the design of the flanges, a high-carbon steel or low-carbon steel follow-up carburization mode is generally adopted. For carbon steel class of flanges, in order to prolong the service life, blanks are generally forged. At present, forging is also a technical choice which is the most energy-saving. In order to increase processing efficiency, the existing flange blanks are generally forged by a die. However, the surface sizes of the flanges in the existing die-forging technology are far beyond tolerance. Taking flanges with 200mm outer diameter and 25mm thickness as examples, after forging, the flanges of which the size differences in a thickness direction are larger than 1mm occupy 50%, the largest difference reaches 27mm, and the end surfaces of the flanges easily bulge or recess. The invention provides a flange die-forging technology. The flange die-forging technology comprises the following steps: preparing materials, preheating a forging die to 200-250DEG C and carrying out die forging for a period.

Description

technical field [0001] The invention relates to the technical field of thermal processing, in particular to a flange die forging process. Background technique [0002] Flange is an important part in mechanical connection. For some cast iron flanges, casting is generally used, but the service life of this type of flange is not high; currently, high carbon steel or low carbon steel is often used in flange design. Subsequent carburizing of carbon steel. For carbon steel flanges, in order to improve their service life, the general blank is forged. At present, forging is also the most energy-saving process choice. In order to improve processing efficiency, the flange blank is made by die forging. , but in the existing die forging process, the surface size of the flange is out of tolerance. For example, the outer diameter of the flange is 200mm and the thickness is 25mm. After forging, the dimensional tolerance in the thickness direction is more than 1mm. Reached 27mm, the end fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/32B21K29/00B21J5/02C21D8/00
CPCB21K1/32B21J5/02B21K29/00C21D8/005
Inventor 陈大明
Owner 重庆市合川区通用汽车配件制造厂
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