Mortise rounding self-adaptive machining method based on group measurement compensation

Abstract

The invention belongs to the field of aero-engine manufacturing, and particularly relates to a tongue-and-groove rounding self-adaptive machining method based on group measurement compensation, which is suitable for turbine disc tongue-and-groove side edge rounding manufacturing. The method comprises the following steps: step 1, establishing a mortise structure and rounding; step 2, finishing mortise rounding detection path planning; step 3, determining tongue-and-groove measurement compensation frequency; step 4, finishing programming of a part machining program; and 5, part machining. The problems that in the prior art, when the side edges of the mortises are rounded, each mortise is measured and compensated, the machine occupation time is too long, and the production efficiency is low due to the fact that the number of the mortises is too large can be solved, the detection frequency is greatly reduced through a group detection self-adaption machining strategy, the machine occupation time of mortise side edge rounding milling machining is shortened, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of aero-engine manufacturing, and in particular is a method for self-adapting the chamfering of a tongue and groove based on group measurement compensation, which is suitable for the chamfering of the side edges of a tongue and groove of a turbine disk. Background Art

[0002] The turbine disk is one of the important core hot end components of the aircraft engine. Working in a harsh environment of high temperature and high speed, the turbine disk is the component with the largest thermal and mechanical load in the engine. In particular, the mortise and tenon rounding structure is the main part for crack initiation and work failure. However, when measuring and compensating each mortise when the mortise and tenon side is rounded after broaching, the machine takes too long due to the large number of mortise and tenons, resulting in low production efficiency.

[0003] A Chinese invention patent (publication number: CN103586516B) proposes a composite processing method for automatic rounding of the edges of high-temperature alloy tenons and grooves, which is mainly used for the automatic rounding of the edges of tenons and grooves of high-temperature alloy disk parts of aircraft engines and gas turbines. A Chinese invention patent (publication number: CN107088753A) proposes a finishing process and processing device for the edges of tenons and grooves of turbine disk parts, which mainly uses a combined process of milling cutter milling and brush finishing for rounding. Both of the above patents focus mainly on the composite process of milling and brushing and the control of processing parameters, and no research has been conducted on the adaptive processing of group detection and compensation of tenons and grooves for rounding. Summary of the invention

[0004] The purpose of the present invention is to provide an adaptive processing method for mortise and tenon rounding based on group measurement and compensation, so as to solve the problem that the existing technology requires measurement and compensation of each mortise when rounding the mortise side, resulting in too long machine time and low production efficiency due to the excessive number of mortise.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A method for adaptively processing mortise and tenon chamfering based on group measurement compensation comprises the following steps:

[0007] Step 1, establish the mortise and tenon structure and chamfer;

[0008] Step 2, complete the path planning for the mortise and tenon rounding detection;

[0009] Step 3, determining the compensation frequency of the mortise and tenon measurement;

[0010] Step 4, complete the part processing program compilation;

[0011] Step 5: Parts processing.

[0012] In the method for adaptive processing of mortise and tenon chamfering based on group measurement compensation, in step 1, the mortise and tenon center difference model is completed according to the design requirements and the chamfering dimensions are established.

[0013] In the method for adaptive processing of mortise and tenon chamfering based on group measurement compensation, in step 2, the probe detection path selection and planning are completed along the mortise and tenon groove shape.

[0014] In the method for adaptive processing of mortise and tenon chamfering based on group measurement compensation, in step 3, the frequency of part measurement is determined according to the number of all mortise and tenon grooves of the part and the deviation of the first and last grooves of the part.

[0015] In the method for adaptive processing of mortise and tenon chamfering based on group measurement compensation, in step 4, the part processing program is compiled according to the part measurement path, the processing program trajectory, and the mortise and tenon measurement frequency.

[0016] In the method for adaptive processing of mortise and tenon chamfering based on group measurement compensation, in step 5, the part is installed and a program is called to complete the part processing.

[0017] Compared with the prior art, the present invention has the following main advantages and beneficial effects:

[0018] 1. The present invention greatly reduces the detection frequency through the group detection adaptive processing strategy, shortens the machine time of the mortise and tenon side chamfering milling processing, and improves the processing efficiency.

[0019] 2. According to on-site verification, the processing time for rounding the side edges of the turbine disc tenon groove according to the present invention is reduced by at least 1 / 4, greatly improving the efficiency of parts processing. It has currently created a value of 60 million yuan, and the value created in subsequent years can reach 100 million yuan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a flow chart of a method for adaptively processing mortise and tenon chamfering based on group measurement compensation.

[0021] Figure 2 It is a schematic diagram of the turbine disc tenon-groove center difference structure and the rounding model of the present invention.

[0022] Figure 3 It is a schematic diagram of the turbine disk tenon and groove detection path planning of the present invention.

[0023] Figure 4 It is a schematic diagram of the program trajectory after the turbine disc tenon and groove measurement grouping of the present invention.

[0024] Figure 5 It is a schematic diagram of the processing of the turbine disk parts of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Example

[0027] like Figure 1 As shown, this embodiment takes a turbine disk part of a certain type of aircraft engine as an example to complete the group measurement compensation adaptive processing of the side rounding of the tongue and groove. The specific process is as follows:

[0028] 1) Establish the mortise and tenon structure and chamfer. Figure 2 As shown, the mortise and tenon center difference model is completed on the computer according to the design requirements and the mortise and tenon side wall chamfering is completed, and the chamfering radius is R0.5mm;

[0029] The meaning of “mortise and tenon mean difference model” is: to establish the mortise and tenon mean difference model according to the nominal value of the mortise and tenon dimensions and the median value of the tolerance in the design drawing.

[0030] 2) Complete the path planning for the mortise and tenon rounding inspection. Figure 3 As shown, the detection path is planned on the computer according to the groove type of the mortise and tenon and verify that the trajectory has no interference or collision;

[0031] The measurement point trajectory of the mortise and tenon groove type is as follows: according to the shape of the mortise and tenon groove, the measurement points are selected in sequence to form a measurement trajectory. In this embodiment, the software for planning the measurement points of the mortise and tenon rounding detection path can be a Siemens measurement cycle or a Renishaw measurement cycle;

[0032] 3) Determine the compensation frequency of the mortise and tenon measurement. The number of mortise and tenons of the part is 148, and the part design drawing requires that the uniform distribution error of all mortise and tenons is within 0.05mm. Therefore, the position error of all mortise and tenons of the part is within 0.05mm. The 148 mortise and tenons are divided into 37 groups of 4.

[0033] Only the first mortise and tenon groove is tested in each group. As the precision of the parts increases, the number of mortise and tenon grooves in a group can increase. If the total number of mortise and tenon grooves cannot be rounded, it can be rounded up and added by 1 to complete the grouping.

[0034] 4) Complete the parts processing program. Figure 4 As shown, after the grouping is completed, the processing program of the mortise and tenon is compiled, and according to the mortise and tenon accuracy in step 3, the allowance offset of the processing trajectory is set to 0.05mm as a protection allowance, and a trajectory processing program of 1 group of 4 grooves is generated;

[0035] In this embodiment, the program can be compiled using UG programming software developed by Siemens;

[0036] 5) Parts processing. Figure 5 As shown, run the program to call the tool and probe to process the parts.

[0037] The implementation results show that 300 turbine discs have been delivered in good condition according to the field application, the number of mortises on a single disc is about 150, and the detection time of a single disc is reduced from 1.25h to 0.3h. This technology can be widely used in the adaptive processing of the detection and compensation of the side rounding of the mortise and tenon of the turbine disc family parts, and can also be extended to the detection and compensation adaptive processing scheme of similar parts. It has strong versatility and practicality, and is very effective in improving the efficiency of part processing, while creating huge economic benefits.

Claims

1. A method for adaptive processing of mortise and tenon chamfering based on group measurement compensation, characterized in that: The following steps are involved: Step 1, establish the mortise and tenon structure and chamfer; Step 2, complete the path planning for the mortise and tenon rounding detection; Step 3, determining the compensation frequency of the mortise and tenon measurement; Step 4, complete the part processing program compilation; Step 5: Parts processing.

2. The method for adaptive processing of mortise and tenon chamfering based on group measurement compensation according to claim 1, characterized in that: In step 1, complete the mortise and tenon center difference model and establish the fillet dimensions according to the design requirements.

3. The method for adaptive processing of mortise and tenon chamfering based on group measurement compensation according to claim 1, characterized in that: In step 2, the probe detection path selection and planning are completed along the mortise and tenon groove shape.

4. The method for adaptive processing of mortise and tenon chamfering based on group measurement compensation according to claim 1, characterized in that: In step 3, the frequency of part measurement is determined according to the number of all tenons and grooves of the part and the deviation of the first and last grooves of the part.

5. The method for adaptive processing of mortise and tenon chamfering based on group measurement compensation according to claim 1, characterized in that: In step 4, the part processing program is compiled according to the part measurement path, processing program trajectory, and mortise and tenon measurement frequency.

6. The method for adaptive processing of mortise and tenon chamfering based on group measurement compensation according to claim 1, characterized in that: In step 5, the part is installed and the program is called to complete the part processing.

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