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A processing method for open case without stop plate

A technology for opening casings and processing methods, which is applied in the field of mechanical parts processing, and can solve problems such as the inability to meet the finishing requirements of the outer surface, the increased machining allowance of the outer surface of the casing, and the uneven appearance allowance.

Active Publication Date: 2016-03-02
AECC AVIATION POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The shape of the casing is first rough machined and cut by wire cutting, then the joint surface is finished, and then the finished shape is assembled. At this time, the outer contour section of the casing is not a standard circle, and there will be long and short axes, and the shape margin becomes insufficient. Uniform, varying between 0.75mm and 2.5mm, the margin at the minimum margin is too small, which obviously cannot meet the requirements for surface finishing
If the allowance is increased to ensure the minimum allowance requirement, the finishing allowance should be at least 4.25mm, resulting in an increase in the local machining allowance on the outer surface of the casing, and the distribution is uneven. Layered milling is required, which increases the processing time and also Not conducive to processing deformation control

Method used

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  • A processing method for open case without stop plate
  • A processing method for open case without stop plate
  • A processing method for open case without stop plate

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] refer to figure 1 and figure 2 , the processing method of the whole forging without the stop plate to the open case, the specific processing steps are as follows:

[0030] Step 1. Determine the outer eccentricity of the casing

[0031] The outer contour section of the casing is two semicircles, the centers 3 of which are on the same line but not at the same point, and the two centers 3 deviate from the center of rotation of the casing by a certain distance, and this distance is the eccentricity δ, such as figure 1 shown. The amount of eccentricity is equal to the unilateral margin z of the finish machining of the joint surface of the casing 1 , between 1.50 and 2.00mm. The eccentricity δ is given as 1.75mm according to the unilateral margin of the joint surface of the casing.

[0032] Step 2. Determine the finishing allowance of the inne...

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Abstract

The invention provides a processing method for a stop plate-free split casing. The processing method for the stop plate-free split casing comprises the following steps: milling the external profile section of a part into two semicircles with offset at a roughing stage; turning an internal profile section into a circle; performing finish milling on the back face of the junction surface of the casing to meet the set tolerance requirements; performing linear cutting along the junction surface of the casing to cut off the casing and performing the finish milling on the junction surface to meet the set tolerance requirements, and connecting the two half casings by using bolts at the junction surface of the casing to finish reassembly of the casing; performing finishing on the internal profile and the external profile of the casing. After roughing, the non-uniform wall thickness of the casing is formed; after the casing is cut off by the linear cutting, the finish milling is performed on the junction surface and the casing is reassembled, uniform finishing allowance can be obtained by the external profile of the casing, and the uniformization of the allowance of the external profile of the casing is realized, and therefore, the processing difficulty is lowered; the finishing of the external profile can be finished by one-pass, so that machining deformation is reduced, and the machining efficiency is improved.

Description

technical field [0001] The invention relates to a processing method of a mechanical part, in particular to a processing method of an opening case without a stop plate. Background technique [0002] The overall forging is opposite to the open case, and the inner surface is generally processed by turning, while the outer surface is processed by milling. If a uniform margin is reserved for finishing after rough machining, then the wire cutting is cut into two halves of the casing along the longitudinal joint surface of the casing and the joint surface is finely milled, and the long axis of the outer contour will be formed at the joint surface of the casing. As a result, the finishing allowance of the outer contour in the direction of the joint surface increases. [0003] For example, a margin of 2.5mm is reserved for the finishing machining of the outer profile of a casing, and a margin of 1.75mm is reserved for one side of the joint surface. The outer shape of the casing is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 刘明星刘智武吴惠雯杨琼汤丽余杰马高峰任景刚
Owner AECC AVIATION POWER CO LTD
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