A forming process for a special-shaped inner ring based on roughening treatment

Abstract

The application relates to a special-shaped inner ring forming process based on roughening treatment, which comprises the following steps: 1) roughening treatment; and 2) cutting processing. The application realizes the clamping and cutting of the special-shaped inner ring taking the annular groove as a positioning reference based on roughening, effectively avoids the stress concentration and deformation of one of the two convex edges due to the over-thin thickness, improves the yield of products, and avoids the increase of the allowance of the annular groove due to the over-wide width under the processing requirements of the corresponding thickness and width, thereby improving the parallelism, flatness and roundness precision of the products.

Description

[0001] This application is a divisional application of application number 202110601973.0, filed on May 31, 2021, entitled "A forming process for precision machining of irregular inner rings". Technical Field

[0002] This invention belongs to the field of precision machining technology, specifically relating to a process for forming irregular inner rings based on roughing treatment. Background Technology

[0003] In the field of precision machining, the final quality depends primarily on the machining process. For example, the machining of the inner ring of the air film assembly has the following defects during the machining process:

[0004] 1) The product has thin walls and is easily deformed;

[0005] 2) No clamping position, making positioning difficult;

[0006] 3) Due to stress concentration, the product will deform further after placement.

[0007] Therefore, how to achieve deformation prevention, easy clamping, and no deformation caused by stress concentration in the processing of such products has become a technical challenge in the field. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a novel irregular inner ring forming process based on roughing treatment.

[0009] To solve the above technical problems, the present invention adopts the following technical solution:

[0010] A process for forming irregular inner rings based on roughing treatment includes the following steps:

[0011] 1) Roughing treatment

[0012] First, using the inner wall of the irregular inner ring as a positioning reference or directly using one end of the outer diameter of the irregular inner ring as a positioning reference, roughing is performed on the circumferential surface of the irregular inner ring to form an annular groove. The depth of the annular groove is less than the allowance for cutting the surface of the irregular inner ring, and the width of the annular groove is w1. The thicknesses of the two convex edges formed by the annular groove are h1 and h2, respectively, where w1 < h1 + h2, |h1 - h2| ≤ 1. The thickness H of the irregular inner ring before roughing is performed, where H = w1 + h1 + h2.

[0013] 2) Cutting process

[0014] After roughing, the irregular inner ring is first roughed and then finished. The annular groove is used as the positioning reference for both roughing and finishing to complete the cutting of the inner and outer walls of the irregular inner ring.

[0015] Preferably, in step 1), the depth of the annular groove is 2 ± 0.2 mm. This setting facilitates the machining of the irregular inner ring surface.

[0016] According to a specific embodiment and preferred aspect of the present invention, in step 1), w1 / H < 1 / 2. This setting avoids the annular groove being too wide, increases the allowance, and improves machining accuracy.

[0017] According to another specific embodiment and preferred aspect of the present invention, after roughing is completed in step 1), the roughened irregular inner ring is first placed in a solution furnace for solution treatment. This allows the stress on the irregular inner ring to be released, preventing stress concentration and further avoiding deformation, thereby improving the product yield.

[0018] Preferably, the roughened irregular inner ring is solution treated at 1100–1200°C. In some specific embodiments, the roughened irregular inner ring is solution treated at 1160±5°C, which yields the best results.

[0019] According to another specific embodiment and preferred aspect of the present invention, the rough machining includes: a) using the annular groove as a positioning reference, the irregular inner ring is pressed against the positioning platform from the rear end face from one side of the groove wall of the annular groove, and the front part of the irregular inner ring and the front part of the annular groove are machined at this time; b) after the front end of the irregular inner ring is machined, the irregular inner ring is rotated 180° and pressed against the positioning platform from the finished end face from the other side of the groove wall of the annular groove, and the front part of the positioned irregular inner ring and the annular groove are machined at this time.

[0020] Preferably, a CNC lathe is used for cutting.

[0021] In addition, the finishing process uses the two ends of the annular groove as positioning references, and the inner wall of the irregular inner ring and the corresponding outer wall are finished by the contact mode of the end face of the irregular inner ring.

[0022] Alternatively, the finishing process can be carried out using the two ends of the annular groove as positioning references, and the inner wall of the irregular inner ring can be finished by the contact mode of the end face of the irregular inner ring. Then, the outer wall of the irregular inner ring can be finished using the inner wall of the irregular inner ring as positioning references.

[0023] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0024] This invention is based on roughing to achieve clamping and cutting of irregular inner rings with an annular groove as the positioning reference. It effectively avoids stress concentration and deformation caused by one of the two convex edges being too thin, thereby improving the product yield. At the same time, under the corresponding thickness and width processing requirements, it avoids the annular groove being too wide, thus avoiding increasing the allowance, thereby improving the parallelism, flatness and roundness accuracy of the product. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, a detailed description of specific embodiments of this application is provided below. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0030] According to the forming process for precision machining of irregular inner rings in this embodiment, the process mainly consists of three parts: 1) roughing treatment; 2) solution treatment; and 3) cutting.

[0031] Specifically, 1) Roughing: First, using one end of the outer diameter of the irregular inner ring as a positioning reference, cut and machine an annular groove on the circumferential surface of the irregular inner ring. The depth of the annular groove is less than the cutting allowance on the surface of the irregular inner ring, and the depth of the annular groove is 2±0.2mm. This setting facilitates the machining of the surface of the irregular inner ring.

[0032] In this example, the thickness H of the irregular inner ring before roughing, the width w1 of the annular groove, and the thicknesses h1 and h2 of the two convex edges formed by the annular groove are respectively, where H = w1 + h1 + h2, and w1 / H < 1 / 2. This setting avoids the annular groove being too wide, increases the allowance, and ensures machining accuracy.

[0033] At the same time, w1 < h1 + h2, and |h1 - h2| ≤ 1. This setting ensures that the thicknesses of the two convex edges are similar, avoiding deformation caused by one of the convex edges being too thin, and facilitating the clamping and processing of the two convex edges.

[0034] 2) Solution treatment: The roughened irregular inner ring is placed in a solution furnace and solution treated at 1160±5℃. This setting releases the stress on the irregular inner ring and prevents deformation after processing.

[0035] 3) Cutting process: First, using the annular groove as the positioning reference, the CNC lathe moves the irregular inner ring from one side of the groove wall to the rear end face and presses it against the positioning platform. At this time, the front part of the irregular inner ring and the front part of the annular groove are machined. Then, after the front end of the irregular inner ring is machined, the irregular inner ring is rotated 180° and the CNC lathe moves the irregular inner ring from the other side of the groove wall to the rear end face and presses it against the positioning platform. At this time, the front part of the positioned irregular inner ring and the annular groove are machined.

[0036] In addition, the cutting process also includes finishing, in which the two ends of the annular groove are used as positioning references, and the inner wall of the irregular inner ring and the corresponding outer wall are finished by fitting and contacting the end face of the irregular inner ring; or, during finishing, the two ends of the annular groove can also be used as positioning references, and the inner wall of the irregular inner ring can be finished by fitting and contacting the end face of the irregular inner ring, and then the outer wall of the irregular inner ring is finished by using the inner wall of the irregular inner ring as positioning reference.

[0037] Therefore, this embodiment has the following advantages;

[0038] 1. By roughing the irregular inner ring and forming an annular groove, the irregular inner ring can be clamped without deformation, which facilitates positioning and processing and ensures the parallelism, flatness and roundness accuracy of the product.

[0039] 2. The irregular inner ring is solution treated to release the stress on the irregular inner ring, avoid stress concentration, further prevent deformation, and improve the product yield.

[0040] 3. Simple clamping, precise positioning, fast processing speed, and improved production efficiency.

[0041] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A forming process for irregularly shaped inner rings based on roughing treatment, characterized in that, The molding process includes the following steps: 1) Roughing treatment First, using the inner wall of the irregular inner ring as the positioning reference or directly using one end of the outer diameter of the irregular inner ring as the positioning reference, roughing is performed on the circumferential surface of the irregular inner ring to form an annular groove. The depth of the annular groove is less than the allowance for cutting the surface of the irregular inner ring, and the depth of the annular groove is 2±0.2mm. The width of the annular groove is w1, and the thicknesses of the two convex edges formed by the annular groove are h1 and h2, respectively, where w1<h1+h2, |h1-h2|≤1; the thickness of the irregular inner ring without roughing is H, where H=w1+h1+h2, w1 / H<1 / 2; 2) Cutting process First, the rough-cut irregular inner ring is placed in a solution furnace at 1100~1200℃ for solution treatment. Then, rough machining is performed, followed by finish machining. In the rough machining, the annular groove is used as the positioning reference to complete the cutting of the inner and outer walls of the irregular inner ring. In the finish machining, the two ends of the annular groove are used as the positioning reference, and the inner wall and the corresponding outer wall of the irregular inner ring are finished by the contact mode of the end face of the irregular inner ring. Alternatively, the two ends of the annular groove are used as the positioning reference, and the inner wall of the irregular inner ring is finished by the contact mode of the end face of the irregular inner ring. Then, the outer wall of the irregular inner ring is finished by using the inner wall of the irregular inner ring as the positioning reference.

2. The irregular inner ring forming process based on roughing treatment according to claim 1, characterized in that, The roughened inner ring is then solution treated at 1160±5℃.

3. The irregular inner ring forming process based on roughing treatment according to claim 1, characterized in that, Rough machining includes: a) using the annular groove as a positioning reference, moving the irregular inner ring from one side of the groove wall backwards to abut the rear end face against the positioning platform, at which point the front part of the irregular inner ring and the front part of the annular groove are machined; b) after the front end of the irregular inner ring is machined, rotate the irregular inner ring 180°, and move the irregular inner ring from the other side of the groove wall backwards to abut the machined end face against the positioning platform, at which point the front part of the positioned irregular inner ring and the annular groove are machined.

4. The irregular inner ring forming process based on roughing treatment according to claim 3, characterized in that, CNC lathe is used for cutting.