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A high-precision special-shaped hole processing method

A processing method and high-precision technology, used in metal processing equipment, manufacturing tools, milling machine equipment, etc., can solve the problems of unstable processing accuracy, inability to meet the high-precision and high-quality processing requirements of aerospace structural parts, and high error rates, achieving Ensure the final forming accuracy and avoid the effect of unstable processing

Active Publication Date: 2022-05-10
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is a test of the personal ability of the processing workers, and the processing efficiency is not high, the error rate is high, and it is easy to cause part failures, which cannot meet the increasingly high-precision, high-quality, and low-cost processing requirements of aerospace structural parts.
[0004] Due to problems such as low efficiency, high error rate, and unstable machining accuracy, the existing process schemes can no longer meet the current processing needs. Efficient and high-quality process methods are urgently needed to improve the stability of the machining process of high-precision special-shaped hole structures, so as to ensure the quality of the parts. processing quality

Method used

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  • A high-precision special-shaped hole processing method
  • A high-precision special-shaped hole processing method
  • A high-precision special-shaped hole processing method

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Effect test

Embodiment 1

[0034] A kind of high-precision special-shaped hole processing method of the present embodiment, such as figure 1 As shown in Fig. 1, set the reference straight edge on both sides of the special-shaped initial hole parallel to the direction required by the high-precision dimension, and use the reference straight edge as the processing reference to set the preliminary machining single-side allowance for the special-shaped initial hole, and then carry out the initial processing of the special-shaped initial hole. Process to obtain the special-shaped preliminary machining hole; set the semi-finishing unilateral allowance for the special-shaped preliminary machining hole with the reference straight edge as the processing reference, and then perform semi-finishing on the special-shaped preliminary machining hole to obtain the special-shaped semi-finishing hole; use the benchmark on both sides The center line of the distance between the straight sides is used as the benchmark to meas...

Embodiment 2

[0036] This embodiment is further optimized on the basis of embodiment 1, such as image 3 As shown, the hole diameter finishing error of the special-shaped semi-finishing hole is measured based on the center line of the distance between the reference straight sides on both sides, which specifically includes the following steps:

[0037] Step A1, randomly select three calibration points on the reference straight edges on both sides, and use the measuring probe to measure the calibration coordinate values ​​of the three calibration points in the direction perpendicular to the high-precision dimension requirement;

[0038] Step A2, calculate the average value of the calibration coordinate values ​​of the three calibration points, and determine the center line of the distance between the reference straight sides on both sides according to the average value of the calibration coordinate values ​​of the reference straight sides on both sides;

[0039] Step A3, using measuring pins ...

Embodiment 3

[0046] This embodiment is further optimized on the basis of the above-mentioned embodiment 1 or 2, and the diameter of the final hole is determined according to the size relationship between the hole diameter finishing error and the tolerance requirement, which specifically includes the following steps:

[0047] Step B1. Obtain the limit upper difference f and the limit lower difference e required by the tolerance, and calculate the median value of the tolerance ;

[0048] Step B2, determining the final hole diameter according to the size relationship between the hole diameter finishing error and the tolerance median;

[0049] Step B3, stepwise adjusting the diameter of the final hole according to the tolerance requirements and preparing a corresponding processing program.

[0050] Further, in step B3, a step adjustment amount is set for the final hole diameter corresponding to each processing program, and the final hole diameter is incrementally enlarged according to the s...

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Abstract

The invention discloses a high-precision special-shaped hole processing method, which belongs to the technical field of special-shaped hole processing. The invention sets parallel reference straight sides on both sides inside the special-shaped initial hole, and uses the reference straight side as the processing reference to set the special-shaped initial hole. Preliminary machining unilateral allowance, and then conduct preliminary machining to obtain special-shaped preliminary machining holes; set semi-finishing unilateral allowance for special-shaped preliminary machining holes based on the reference straight edge, and then perform semi-finishing to obtain special-shaped semi-finishing holes; Measure the hole diameter finishing error of the special-shaped semi-finishing hole based on the center line of the distance between the reference straight sides on both sides, and determine the diameter of the final hole according to the relationship between the hole diameter finishing error and the tolerance requirement. The machining hole is finished until the hole diameter reaches the standard; the invention can complete the preliminary machining, semi-finishing and finishing machining of the special-shaped hole without changing the tool, so as to ensure the processing stability in the whole processing process, and then ensure the forming accuracy of the final special-shaped hole .

Description

technical field [0001] The invention belongs to the technical field of special-shaped hole processing, and in particular relates to a high-precision special-shaped hole processing method. Background technique [0002] The special-shaped hole structure is a structure that exists in the web or shape of the part. Due to its irregular shape, it is often composed of straight sides and arcs. Therefore, it is mostly processed by an end mill during processing, and the manufacturing accuracy is low. With the development of aerospace structural parts manufacturing technology, more and more parts have special-shaped hole structures, and many special-shaped holes are endowed with high manufacturing precision, which undoubtedly increases the difficulty of CNC machining. [0003] In addition, due to the structural characteristics of the special-shaped hole itself and the precision requirements proposed by the current design, it is difficult for common CNC machining methods to meet the mac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23C3/00
CPCB23C3/00
Inventor 方雨舟周进张也钟建张杨胡龙张云诏
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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