Method for the deformation-proof production of thin-walled housings

Abstract

The present application relates to the technical field of thin-walled shell processing, and particularly relates to a thin-walled shell anti-deformation manufacturing method, comprising designing a cavity, designing a pouring channel, casting, heat treatment, machining, heat treatment; wherein, when the cavity is designed, the formed product is ensured to have a first annular reinforcing rib and a second annular reinforcing rib; when the pouring channel is designed, the gap channel is used as a vertical reinforcing rib, and the first annular reinforcing rib, the second annular reinforcing rib and the vertical reinforcing rib are reserved until after the heat treatment. The thin-walled shell anti-deformation manufacturing method provided by the present application can reduce the deformation amount in the product manufacturing process, so that the product is easy to be aligned during processing, and the wall thickness is easier to be kept within the tolerance range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin-walled shell processing, in particular to a thin-walled shell anti-deformation manufacturing method. BACKGROUND

[0002] A certain shell product is a straight cylinder or a conical cylinder structure, the outer contour of which is several hundred millimeters and the wall thickness of which is less than 10 millimeters, and the overall structure has the characteristics of a large surface area and a small average wall thickness. This product is generally formed by differential pressure casting, heat treatment and then machining. During machining, the outer cylindrical surface and the end inner wall are machining surfaces, and the shell cavity is a non-machining surface directly formed by casting, and the wall thickness tolerance cannot be corrected by setting the inner wall machining amount, and the deformation problem during the manufacturing process often leads to the wall thickness size of the shell exceeding the tolerance, and many products are ultimately scrapped.

[0003] To overcome the product deformation, a support rod tool is installed in the shell cavity after solid solution and before the strengthening phase is precipitated, to prevent the deformation of the shell, and the support rod tool in the cavity is removed after aging, to reduce the deformation of the shell during heat treatment. Production verification shows that the use of the support rod tool has a certain effect, but it is uncontrollable. On the one hand, only one support rod can be set at each cross section, the support force is not uniform, and there is still a large deformation, which will cause the machining reference of the casting to be distorted and difficult to be aligned, and ultimately lead to the wall thickness of the shell exceeding the limit range of the tolerance; on the other hand, the support rods set in the diameter direction of the cavity are not centrally positioned, and the support rods installed at different cross sections are also eccentric, which will also lead to the uncontrollable wall thickness of the final shell. SUMMARY

[0004] To overcome the technical defects of large deformation and difficult to guarantee the wall thickness of the existing thin-walled shell, the present application provides a thin-walled shell anti-deformation manufacturing method.

[0005] The present application provides a thin-walled shell anti-deformation manufacturing method, which comprises the following steps:

[0006] S1, designing a cavity, so that the formed blank has a first annular reinforcing rib and a second annular reinforcing rib added on the basis of the product structure, the first annular reinforcing rib is provided with at least two, the first annular reinforcing rib is coaxial with the product and protrudes on the outer cylindrical surface of the product, and the second annular reinforcing rib is provided with two and protrudes on the inner walls of the two ends of the product;

[0007] S2, designing at least three pouring channels, all of which are located outside the cavity and are uniformly distributed in the circumferential direction, the pouring channel comprises a vertical cylinder gate and a gap gate, the vertical cylinder gate is communicated with the cavity through the gap gate, and the length of the gap gate covers the axial length of the entire product to form a vertical reinforcing rib after casting;

[0008] S3, casting;

[0009] S4, remove the forming part corresponding to the column runner, and keep the vertical reinforcing rib;

[0010] S5, heat treatment: solid solution;

[0011] S6, remove the vertical reinforcing rib, the first annular reinforcing rib and the second annular reinforcing rib, and machine all processing surfaces according to the process;

[0012] S7, heat treatment: stress relief failure.

[0013] Optionally, it further comprises:

[0014] S8, flaw detection.

[0015] Optionally, in step S3, after casting forming, the inner cavity diameter of the product is detected.

[0016] Optionally, in step S5, after solid solution and aging, the inner cavity diameter of the product is detected.

[0017] Optionally, in step S6, after machining, the wall thickness of the product is measured.

[0018] Compared with the prior art, the technical scheme provided by the present application has the following advantages:

[0019] The anti-deformation manufacturing method of the thin-walled shell provided by the present application integrally forms the first annular reinforcing rib, the second annular reinforcing rib and the vertical reinforcing rib with the product, the first annular reinforcing rib and the vertical reinforcing rib form a grid-shaped anti-deformation support frame, the anti-deformation support frame can increase the stiffness and deformation capacity of the shell, the second annular reinforcing rib can avoid deformation of the end of the product, and the process flow is adjusted to keep the anti-deformation support frame and the second annular reinforcing rib after heat treatment, thereby reducing the maximum deformation amount of the shell generated during heat treatment. In this way, the deformation amount in the product manufacturing process is reduced, so that the product is easy to align during processing, and the wall thickness is more easily kept within the tolerance range. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings incorporated into the specification and forming a part thereof, show embodiments consistent with the present application, and together with the specification serve to explain the principles of the application.

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 The figure shows the blank stereogram formed by casting in step S3 in the embodiments of the present application;

[0023] Figure 2 This is a cross-sectional view of the blank formed by casting in step S3 of this embodiment of the invention.

[0024] In the picture:

[0025] 1. Product; 2. First annular reinforcing rib; 3. Second annular reinforcing rib; 4. Casting channel; 41. Vertical gating channel; 42. Gating channel; 5. Vertical reinforcing rib. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0027] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0029] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] In one embodiment, such as Figure 1 and Figure 2 As shown, the method for manufacturing a thin-walled shell to prevent deformation includes steps S1 to S7.

[0031] S1. Design the cavity so that the formed blank is provided with a first annular reinforcing rib 2 and a second annular reinforcing rib 3 on the basis of the product 1 structure. There are at least two first annular reinforcing ribs 2. The first annular reinforcing ribs 2 are coaxial with the product 1 and protrude from the outer circular surface of the product 1. There are two second annular reinforcing ribs 3 and they protrude from the inner walls of both ends of the product 1 respectively.

[0032] Specifically, there are three first annular reinforcing ribs 2. Of course, in other alternative embodiments, the number of first annular reinforcing ribs 2 can be adapted to the length of product 1, for example, two or four or more.

[0033] Specifically, the thickness of the first annular reinforcing rib 2 and the second annular reinforcing rib 3 are both 14mm, and the width is 30mm. Of course, in other alternative embodiments, the first annular reinforcing rib 2 and the second annular reinforcing rib 3 can be designed with other sizes according to the size adaptability of product 1.

[0034] It should be noted that after production verification, the deformation of the shell after heat treatment is as follows: the maximum diameter of the two end portions is about 4.5 mm larger than the minimum diameter; the inner diameter of the generatrix of the shell with thick boss increases by 0.2-0.8 mm, and theoretically the wall thickness affects 0.1-0.8 mm; the inner diameter of the generatrix of the shell with uniform wall thickness decreases by 0.8-1.58 mm, and theoretically the wall thickness affects 0.02-0.81 mm. It can be seen from this that the inner diameter of the product 1 end portion is deformed the most, which also verifies the necessity of the design of the second annular reinforcing rib 3.

[0035] S2, at least three casting channels 4 are designed, all of which are located outside the cavity and are uniformly distributed in the circumferential direction, and the casting channels 4 include a vertical cylinder gate 41 and a slit gate 42, the vertical cylinder gate 41 is communicated with the cavity through the slit gate 42, and the length of the slit gate 42 covers the entire axial length of the product 1 to form a vertical reinforcing rib 5 after casting.

[0036] Specifically, four casting channels 4 are provided. In other alternative embodiments, the number of casting channels 4 can be determined according to the casting process adaptability, for example, three or five or more.

[0037] Specifically, the length of the vertical cylinder gate 41 also covers the entire axial length of the product 1 to ensure the casting rate.

[0038] Specifically, the diameter of the vertical cylinder gate 41 is 60 mm, and the width of the slit gate 42 is 18 mm, and the length is 18 mm. In other alternative embodiments, the vertical cylinder gate 41 and the slit gate 42 can be adaptively adjusted to other sizes according to the process.

[0039] It should be noted that, Figure 1 and Figure 2 In the above, the structures referred to by the vertical cylinder gate 41 and the slit gate 42 are actually not the gates themselves, but the structures formed by the gates. For example, the slit gate 42 is cast to form a vertical reinforcing rib 5.

[0040] S3, casting;

[0041] S4, removing the corresponding formed part of the vertical cylinder gate 41 and retaining the vertical reinforcing rib 5;

[0042] S5, heat treatment: solid solution;

[0043] S6, removing the vertical reinforcing rib 5, the first annular reinforcing rib 2 and the second annular reinforcing rib 3, and machining all the machined surfaces according to the process;

[0044] S7, heat treatment: stress relief failure.

[0045] The steps S3 to S7 are operated by using mature technology. It should be noted that in the method, the first annular reinforcing rib 2, the second annular reinforcing rib 3 and the vertical reinforcing rib 5 formed by casting are removed after heat treatment and machining.

[0046] The anti-deformation manufacturing method of the thin-walled shell of the embodiment integrally forms the first annular reinforcing rib 2, the second annular reinforcing rib 3 and the vertical reinforcing rib 5 with the product 1, the first annular reinforcing rib 2 and the vertical reinforcing rib 5 form a grid-shaped anti-deformation support frame, the anti-deformation support frame can increase the rigidity and deformation capacity of the shell, the second annular reinforcing rib 3 can avoid deformation of the end of the product 1, and the process flow is adjusted to retain the anti-deformation support frame and the second annular reinforcing rib 3 after heat treatment, thereby reducing the maximum deformation of the shell during heat treatment. In this way, the deformation amount during the manufacturing process of the product 1 is reduced, so that the product 1 is easy to align during machining, and the wall thickness is more easily kept within the tolerance range.

[0047] In some embodiments, there is a step S8 of flaw detection after step S7. The flaw detection can be performed by using existing mature technology, and is aimed at detecting internal defects of the product 1 to determine whether the product 1 is qualified.

[0048] In some embodiments, in step S3, the inner cavity diameter of the product 1 is detected after casting forming; in step S5, the inner cavity diameter of the product 1 is detected after solid solution and aging; and in step S6, the wall thickness of the product 1 is measured after machining. The dimensions of the product 1 are detected in time after casting, heat treatment and machining, so as to determine whether the product 1 is qualified in advance, so as to avoid wasting resources in subsequent processes.

[0049] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Although the foregoing embodiments are described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should be covered in the protection scope of the claims.

Claims

1. A method of deformation prevention manufacture of a thin-walled case, characterized by, It comprises the following steps: S1. Designing a cavity so that the formed blank has a first annular reinforcing rib (2) and a second annular reinforcing rib (3) added on the basis of the structure of the product (1), the first annular reinforcing rib (2) is provided with at least two, the first annular reinforcing rib (2) is coaxial with the product (1) and protrudes on the outer circular surface of the product (1), the second annular reinforcing rib (3) is provided with two and protrudes on the inner wall of both ends of the product (1); S2. Designing at least three pouring channels (4), all of which are located outside the cavity and are evenly distributed in the circumferential direction, the pouring channel (4) comprises a vertical cylinder gate (41) and a slit gate (42), the vertical cylinder gate (41) is communicated with the cavity through the slit gate (42), the length of the slit gate (42) covers the axial length of the entire product (1) to form a vertical reinforcing rib (5) after casting; The first annular reinforcing rib (2) and the vertical reinforcing rib (5) form a grid-shaped anti-deformation support frame; S3. Casting; S4. Remove the corresponding formed part of the vertical cylinder gate (41), and keep the vertical reinforcing rib (5); S5. Heat treatment: solid solution; S6. Remove the vertical reinforcing rib (5), the first annular reinforcing rib (2) and the second annular reinforcing rib (3), and machine all processing surfaces according to the process; S7. Heat treatment: stress relief failure.

2. The anti-deformation manufacturing method of a thin-walled case according to claim 1, characterized by, It also includes: S8. Defect detection.

3. The anti-deformation production method of a thin-walled case according to claim 1 or 2, characterized in that, In step S3, after casting and forming, the inner diameter of the product (1) is detected.

4. The anti-deformation production method of a thin-walled case according to claim 3, characterized by, In step S5, after solid solution and aging, the inner diameter of the product (1) is detected.

5. The anti-deformation production method of a thin-walled case according to claim 4, characterized by, In step S6, after machining, the wall thickness of the product (1) is measured.

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