Method for controlling deformation of thin-walled box cover part machining

Abstract

The application provides a method for controlling deformation of a thin-walled box cover part in processing, and belongs to the technical field of part processing. The method comprises the following steps: 1) pretreatment of a thin-walled box cover blank; 2) determination of the outer contour of the thin-walled box cover part on the thin-walled box cover blank, and opening of a positioning groove at the outer contour part of the thin-walled box cover part; nesting of the positioning groove and a clamping boss on a clamping tool, wherein the shape of the positioning groove is consistent with the shape of the clamping boss; and 3) processing of the thin-walled box cover blank. The application overcomes the technical difficulty of part deformation in the processing of the thin-walled box cover part, improves the qualified rate of the thin-walled box cover part processing, improves the process stability and product consistency of the product, and ensures the stability of the quality of the thin-walled box cover part product.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of part processing, and relates to a thin-walled box cover part processing technology, in particular to a method for controlling deformation of thin-walled box cover part processing. BACKGROUND

[0002] Thin-walled box cover parts account for a large number in aviation field component products and bear important functional characteristics. The processing materials of the thin-walled box cover parts are mostly aluminum alloys, which have high plasticity. Meanwhile, the thin-walled box cover parts are mostly in special-shaped structures, which leads to the problems of large material removal rate and large clamping and positioning difficulty. Residual stress is generated in the processing process, and the stress distribution is difficult to be uniform due to the special-shaped structure. Deformation is generated in the part processing process, which leads to the problems of difficult guarantee of product processing precision, poor process stability and product consistency, low qualified rate of batch products formed in processing, and poor quality stability. SUMMARY

[0003] In view of the problems of deformation of the thin-walled box cover parts commonly used in the aviation field in the processing process, difficult guarantee of product processing precision, and poor process stability and product consistency, the application provides a method for controlling deformation of thin-walled box cover part processing.

[0004] The application mainly opens a positioning groove at the outer contour part of the thin-walled box cover part, and designs a clamping tool used in the processing of the thin-walled box cover part. The clamping tool is provided with a clamping boss matched with the positioning groove. In the processing, the positioning groove is nested on the clamping boss to realize positioning and clamping of the thin-walled box cover part. After positioning and clamping, the deformation of the thin-walled box cover part generated in the processing process can be effectively controlled, the qualified rate of the thin-walled box cover part processing is improved, the process stability and product consistency of the product are improved, and the stability of the quality of the thin-walled box cover part product is ensured. The specific technical scheme is as follows:

[0005] The method for controlling deformation of thin-walled box cover part processing comprises the following steps:

[0006] 1) thin-walled box cover blank pretreatment;

[0007] 2) determining the outer contour of the thin-walled box cover part on the thin-walled box cover blank, and opening a positioning groove at the outer contour part of the thin-walled box cover part;

[0008] nesting the positioning groove and the clamping boss on the clamping tool, wherein the shape of the positioning groove is consistent with the shape of the clamping boss;

[0009] 3) processing the thin-walled box cover blank.

[0010] It is further limited that the positioning groove surrounds the outer contour of the thin-walled box cover part once.

[0011] Further limited, the thin-walled box cover parts are fixed on the clamping tool through the pressing plate.

[0012] Further limited, the positioning groove and the clamping boss are provided with fastening holes, and the positioning groove and the clamping boss are detachably fastened and connected through fastening members arranged in the fastening holes.

[0013] Further limited, the step 3) comprises:

[0014] 3.1) milling the outer shape of the thin-walled box cover parts on the thin-walled box cover blank, boring the positioning holes of the thin-walled box cover parts, and forming the thin-walled box cover part preliminary sample;

[0015] 3.2) milling the lug boss on the thin-walled box cover part preliminary sample, and forming the thin-walled box cover part.

[0016] Further limited, the step 3) further comprises:

[0017] 3.3) sequentially performing cleaning, inspection, chromic acid anodic oxidation and oil sealing on the thin-walled box cover part.

[0018] Further limited, the step 1) comprises:

[0019] 1.1) milling the thin-walled box cover blank preliminary sample;

[0020] 1.2) performing stress relief treatment on the thin-walled box cover blank preliminary sample by keeping the temperature at 90-110 DEG C for more than 6 hours and air cooling;

[0021] 1.3) grinding the thin-walled box cover blank preliminary sample to a flatness of 0.05 mm and a roughness of 0.4 mu m, and forming the thin-walled box cover blank.

[0022] Compared with the prior art, the present application has the beneficial effects that:

[0023] The present application determines the outer contour of the thin-walled box cover parts on the thin-walled box cover blank, opens the positioning groove at the determined outer contour part of the thin-walled box cover parts, nests the positioning groove in the clamping boss on the clamping tool, realizes the matching clamping of the thin-walled box cover parts and the clamping tool, effectively controls the deformation of the thin-walled box cover parts in the processing process after positioning and clamping, overcomes the technical difficulty of part deformation in the processing of the thin-walled box cover parts, improves the qualified rate of the thin-walled box cover part processing, improves the process stability and product consistency of the product, and ensures the stability of the thin-walled box cover part product quality. The method of the present application can be applied to the processing of similar thin-walled box cover products, and has wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective view of the thin-walled box cover part in the embodiment;

[0025] Figure 2 A sectional view of the thin-walled box cover part in the embodiment;

[0026] Figure 3 A structural schematic view of the positioning groove opened at the outer contour part of the thin-walled box cover part in the embodiment;

[0027] Figure 4 A clamping tool for the thin-walled box cover part in the embodiment;

[0028] Wherein, 1-thin-walled box cover part, 11-positioning groove, 2-clamping tool, 21-pressing plate, 22-clamping boss, 23-fixing hole. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be further explained and described in combination with the drawings and embodiments, but the present application is not limited to the following described embodiments.

[0030] EMBODIMENT

[0031] The method for controlling the deformation of the thin-walled box cover part includes the following steps:

[0032] 1) Pre-treatment of the thin-walled box cover blank;

[0033] 2) Determining the outer contour of the thin-walled box cover part 1 on the thin-walled box cover blank, and opening the positioning groove 11 at the outer contour part of the thin-walled box cover part 1;

[0034] Embedding the positioning groove 11 and the clamping boss 22 on the clamping tool 2, wherein the shape of the positioning groove 11 matches the shape of the clamping boss 22;

[0035] 3) Machining the thin-walled box cover blank.

[0036] The positioning groove 11 surrounds the outer contour of the thin-walled box cover part 1.

[0037] The thin-walled box cover part 1 is fixed on the clamping tool 2 by the pressing plate 21.

[0038] Fastening holes are opened on the positioning groove 11 and the clamping boss 22, and fasteners are arranged in the fastening holes to detachably and tightly connect the positioning groove 11 and the clamping boss 22.

[0039] The step 3) includes:

[0040] 3.1) Milling the outer shape of the thin-walled box cover part 1 on the thin-walled box cover blank, and drilling the positioning hole of the thin-walled box cover part 1 to form a preliminary sample of the thin-walled box cover part;

[0041] 3.2) Milling the lug boss on the preliminary sample of the thin-walled box cover part to form the thin-walled box cover part 1.

[0042] The step 3) further comprises:

[0043] 3.3) sequentially cleaning, inspecting, chromic acid anodizing and oil sealing the thin-walled box cover part 1.

[0044] The step 1) comprises:

[0045] 1.1) milling out a thin-walled box cover blank initial sample;

[0046] 1.2) performing stress relief treatment on the thin-walled box cover blank initial sample by keeping it at a temperature of 90-110℃ for more than 6 hours and air cooling;

[0047] 1.3) grinding the thin-walled box cover blank initial sample to a flatness of 0.05mm and a roughness of 0.4μm to form a thin-walled box cover blank.

[0048] This embodiment takes an aviation box cover as an example, referring to Figure 1 and Figure 2 , the maximum outer dimension of the aviation box cover is about 210mmx180mmx11.5mm, the bottom wall thickness and the side wall thickness are 2mm, which belongs to a thin-walled box cover part 1.

[0049] Specifically, the method for controlling the machining deformation of the thin-walled box cover part comprises the following steps:

[0050] 1) aviation box cover blank pretreatment; the specific steps are:

[0051] 1.1) according to the maximum outer dimension of the aviation box cover, milling out the aviation box cover blank initial sample, removing the excess amount, and processing it to a roughness of 3.2μm; removing burrs;

[0052] 1.2) performing stress relief treatment on the aviation box cover blank initial sample by keeping it at a temperature of 100℃ for more than 6 hours and air cooling; specifically, the treatment temperature of the aviation box cover blank initial sample can also be 90℃, 95℃, 105℃ or 110℃;

[0053] 1.3) grinding the aviation box cover blank initial sample after stress relief treatment to a flatness of 0.05mm and a roughness of 0.4μm to form an aviation box cover blank;

[0054] 2) referring to Figure 3 , determining the outer contour of the aviation box cover on the aviation box cover blank, and opening a positioning groove 11 at the outer contour part of the aviation box cover;

[0055] Referring to Figure 4The positioning groove 11 is nested with the clamping boss 22 on the clamping tool 2, wherein the shape of the positioning groove 11 is consistent with the shape of the clamping boss 22; preferably, a fixing hole 23 is formed around the clamping boss 22 on the clamping tool 2, a screw or a pin is arranged in the fixing hole 23, one end of the pressing plate 21 is fixed on the clamping tool 2 through the screw or the pin, and the other end of the pressing plate 21 extends above the aviation box cover, and the aviation box cover is fixed on the clamping tool 2 through the pressing plate 21.

[0056] Preferably, the positioning groove 11 surrounds the outer contour of the aviation box cover, a fastening hole is formed on the positioning groove 11 and the clamping boss 22, and a fastener is arranged in the fastening hole, so that the positioning groove 11 and the clamping boss 22 are detachably fastened and connected through the fastener; specifically, the fastener is a screw, a bolt or other threaded fastener.

[0057] 3) Processing the thin-walled box cover blank; the specific steps are as follows:

[0058] 3.1) Taking the ground plane of the aviation box cover blank as a reference, milling the cavity-free end face to ensure the thickness size of the part, milling the cavity back surface contour, milling the contour of the aviation box cover on the aviation box cover blank, and boring the positioning hole of the aviation box cover, retaining the hexahedral contour of the aviation box cover blank, and forming the aviation box cover preliminary sample;

[0059] 3.2) Milling the lug table on the aviation box cover preliminary sample to form the aviation box cover;

[0060] 3.3) The aviation box cover is sequentially cleaned, inspected, chromic acid anodized and sealed with oil.

[0061] Specifically, the cleaning process is performed by using a conventional aluminum alloy cleaning process;

[0062] Specifically, the inspection process is performed according to the conventional characteristic inspection process of the aviation box cover;

[0063] Specifically, the chromic acid anodizing process is performed according to the general process of aluminum alloy chromic acid anodizing;

[0064] Specifically, the oil sealing process is performed according to the general process of aluminum alloy material.

Claims

1. A method for controlling deformation during the machining of thin-walled box cover parts, characterized in that, Includes the following steps: 1) Pre-treatment of thin-walled box cover blanks; Step 1) includes: 1.1) Mill out the initial sample of the thin-walled box cover blank; 1.2) The initial sample of the thin-walled box cover blank is kept at a temperature of 90℃-110℃ for more than 6 hours, then air-cooled to relieve stress. 1.3) Grind the initial sample of the thin-walled box cover blank to a flatness of 0.05 mm and a roughness of 0.4 μm to form the thin-walled box cover blank; 2) Determine the outer contour of the thin-walled box cover part (1) on the thin-walled box cover blank, and open the positioning groove (11) on the outer contour of the thin-walled box cover part (1); The positioning groove (11) is nested with the clamping boss (22) on the clamping tool (2), wherein the shape of the positioning groove (11) matches the shape of the clamping boss (22); 3) Machining the thin-walled box cover blank; Step 3) includes: 3.1) Mill out the outline of the thin-walled box cover part (1) on the thin-walled box cover blank and bore the positioning hole of the thin-walled box cover part (1) to form the initial sample of the thin-walled box cover part. 3.2) Mill a lug on the initial sample of the thin-walled box cover part to form the thin-walled box cover part (1).

2. The method for controlling the deformation during the processing of thin-walled box cover parts as described in claim 1, characterized in that, The positioning groove (11) surrounds the outer contour of the thin-walled box cover part (1).

3. The method for controlling the deformation during the processing of thin-walled box cover parts as described in claim 2, characterized in that, The thin-walled box cover part (1) is fixed on the clamping tool (2) by a pressure plate (21).

4. The method for controlling the deformation during the processing of thin-walled box cover parts as described in claim 2, characterized in that, Both the positioning groove (11) and the clamping boss (22) are provided with fastening holes. Fasteners are installed in the fastening holes to detachably fasten the positioning groove (11) and the clamping boss (22).

5. The method for controlling the deformation during the processing of thin-walled box cover parts as described in claim 1, characterized in that, Step 3) also includes: 3.3) Clean, inspect, chromic acid anodize and oil seal the thin-walled box cover parts (1) in sequence.

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