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Composite Fixture for Machining Circumferential Taper Hole of Special-shaped Nozzle Shell

A nozzle and shell technology, which is applied in the field of the machining method for the circumferential taper hole of the special-shaped nozzle shell and the composite fixture thereof, can solve the problem of inaccurate alignment of the small-end taper hole 801, affecting the processing quality of the nozzle shell, and reducing the taper hole. problems such as poor surface appearance quality, to achieve the effect of excellent apparent quality, meeting product design accuracy requirements, and high machining accuracy

Active Publication Date: 2016-11-30
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that only the outer taper hole 802 can be processed first. Because the shell is longer and the taper hole is deeper, the tool is seriously lost during processing, and the apparent quality of the taper surface is very poor; Inaccurate, the alignment pin hole is far away from the center, the phenomenon of error amplification is serious, and it is easy to loosen after repeated use, which further causes the problem of inaccurate positioning, and then affects the processing quality of the nozzle shell

Method used

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  • Composite Fixture for Machining Circumferential Taper Hole of Special-shaped Nozzle Shell
  • Composite Fixture for Machining Circumferential Taper Hole of Special-shaped Nozzle Shell
  • Composite Fixture for Machining Circumferential Taper Hole of Special-shaped Nozzle Shell

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Experimental program
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Effect test

Embodiment 1

[0040] For the special-shaped nozzle shell, three cone holes are distributed in the circumferential direction. The cone holes are composed of a coaxial small end cone hole and an outer cone hole. The cone angle of the outer cone hole is 10° on one side, and the small end cone hole is The angle is 1.5° on one side, the angle between the centerline of the cone hole and the centerline of the nozzle casing is 38°±5′, and the space dimension L between the intersection point of the centerline of the cone hole and the centerline of the nozzle casing and the end face of the small end is 10.2± 0.05mm, the relative angle of the circumferential tapered hole is two places of 128°±5′, and the total length of the shell is 195±0.2mm.

[0041] The processing steps are as follows:

[0042] 1) Rough machining of the nozzle shell: refer to the final size of the product to carry out rough machining on each part of the nozzle shell to remove the allowance, process the total length of the shell to ...

Embodiment 2

[0051] For a special-shaped nozzle shell, three taper holes are distributed in the circumferential direction. The taper holes are composed of a coaxial small-end taper hole and an outer taper taper hole. The cone angle of the cone hole is 1° on one side, the angle between the centerline of the cone hole and the centerline of the nozzle casing is 36°±5′, and the space dimension L between the intersection point of the centerline of the cone hole and the centerline of the nozzle casing is from the small end is 18.5±0.05mm, the relative angles of three taper holes in the circumferential direction are two 132°±5′, and the total length of the shell is 235±0.3mm.

[0052] The processing steps are as follows:

[0053] 1) Rough machining of the nozzle shell: refer to the final size of the product to carry out rough machining on each part of the nozzle shell to remove the allowance. The rough machining shall leave a margin of 2-3mm on one side according to the maximum size of the nozzle...

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Abstract

The invention discloses a method for processing a circumferential taper hole of a special-shaped nozzle casing and a composite fixture thereof. The method includes: 1) rough machining of the nozzle casing; 2) flat grinding of the end surface of the nozzle casing; 3) the nozzle casing body semi-finishing; 4) Small end taper hole processing of the nozzle casing; 5) Outer taper taper hole processing of the nozzle casing; 6) Position accuracy detection of the circumferential taper hole. The invention adopts special composite fixtures, strict clamping and alignment methods to process the taper hole of the nozzle shell, high machining accuracy, and stable batch quality; during processing, alignment and tool alignment only need to be performed when processing the first taper hole , the follow-up taper hole is directly processed by adjusting the positioning plate, and the processing efficiency is improved; the space size of the taper hole is guaranteed by the composite fixture, and the positioning accuracy is high, which fully meets the product space dimension accuracy requirements.

Description

technical field [0001] The invention relates to the processing technology of a nozzle casing of a solid rocket motor ejection system, in particular to a method for processing a peripheral taper hole of a special-shaped nozzle casing and a composite fixture thereof. Background technique [0002] With the development of modern design technology, some types of solid rocket motor nozzle shells are special-shaped nozzle shells that integrate multiple functions such as combustion chambers, convergent nozzles, diffuser nozzles, and mouth seals. Body, the overall structure of the special-shaped nozzle shell is complex, with special-shaped holes, slopes and grooves all over the outer cone surface, most of the dimensions are space dimensions and cannot be set. [0003] As the final actuator of the ejection system, the nozzle casing is a key part of the whole system. like figure 1 , figure 2 As shown, the overall structure of the nozzle shell is conical, and there are three fire-sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H5/04B23Q3/04
Inventor 刘辉夏国辉范海旭周大华钟臻荣谭鹏
Owner 湖北三江航天江北机械工程有限公司
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