Processing technology in profiled inner ring forming processing

Abstract

The present application relates to the processing technology in the forming processing of the special-shaped inner ring, which comprises the following steps: 1), roughening treatment; 2), solid solution treatment. The present application is based on the roughening to realize the clamping and processing of the special-shaped inner ring, and the solid solution treatment is combined to enable the stress on the special-shaped inner ring to be released, effectively avoid the stress concentration and deformation of one of the two convex edges due to the over-thin thickness, improve the yield of the product, and under the processing requirements of the corresponding thickness and width, avoid the over-wide annular groove to increase the allowance, and further improve the parallelism, flatness and roundness precision of the product.

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 processing technology in the forming of irregular inner rings. 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 device 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 brand-new processing technology for the forming of irregular inner rings.

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

[0010] A processing technique for forming irregular inner rings 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 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. The thickness of the irregular inner ring before roughing is H, where H = w1 + h1 + h2, and w1 / H < 1 / 2, |h1 - h2| ≤ 1.

[0013] 2) Solution treatment

[0014] The roughened irregular inner ring is placed in a solution furnace for solution treatment.

[0015] Based on step 1) above, 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. 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 convex edge being too thin, and facilitating the clamping and machining of the two convex edges.

[0016] According to a specific embodiment and preferred aspect of the invention, in step 1), the depth of the annular groove is less than the cutting allowance of the irregular inner ring surface. This arrangement facilitates the machining of the irregular inner ring surface. In some specific embodiments, the depth of the annular groove is 2 ± 0.2 mm.

[0017] According to another specific embodiment and preferred aspect of the invention, in step 2), the roughened irregular inner ring is solution treated at 1100–1200°C. This arrangement releases stress on the irregular inner ring and prevents deformation after processing. In some specific embodiments, the roughened irregular inner ring is solution treated at 1160±5°C.

[0018] According to another specific embodiment and preferred aspect of the present invention, the processing further includes the step: 3) cutting and positioning, using the annular groove as a positioning reference, the irregular inner ring is pressed against the positioning platform from one side of the groove wall. This effectively implements clamping and positioning, and reduces cutting deformation.

[0019] Preferably, in step 3), the cutting positioning includes front-end machining positioning and rear-end machining positioning. The front-end machining positioning involves a CNC lathe moving the irregularly shaped inner ring from one side of the annular groove wall backwards to abut the rear end face against the positioning platform. The rear-end machining positioning involves rotating the irregularly shaped inner ring 180° and then moving it from the other side of the annular groove wall backwards to abut the machined end face against the positioning platform. This is to avoid machining deformation.

[0020] According to another specific embodiment and preferred aspect of the present invention, the processing process further includes the following steps: 4) fine machining positioning, with the two ends of the annular groove as positioning references, and the irregular inner ring end face fitting and contacting.

[0021] Preferably, in step 4), 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 precision machined in a mating and contacting mode.

[0022] Alternatively, in step 4), the two ends of the annular groove are used as positioning references, and the inner wall of the irregular inner ring is precision machined in the contact mode of the end face of the irregular inner ring. Then, the outer wall of the irregular inner ring is precision machined using the inner wall of the irregular inner ring as the positioning reference.

[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. Combined with solution treatment, the stress on the irregular inner ring can be released, effectively avoiding stress concentration and deformation caused by one of the two convex edges being too thin, thus improving the product yield. At the same time, under the corresponding thickness and width processing requirements, it avoids the annular groove being too wide and 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; 3) cutting processing (including cutting positioning and finishing positioning).

[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 against the positioning platform (equivalent to front-end machining positioning). 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 against the positioning platform (equivalent to rear-end machining positioning). At this time, the front part of the positioned irregular inner ring and the annular groove are machined. That is, the cutting process is completed in the cutting positioning process.

[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 and the corresponding outer wall of the irregular inner ring are finished by fitting and contacting the end faces of the irregular inner ring respectively; 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 faces 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 processing technology for forming irregularly shaped inner rings, characterized in that, The processing technology 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. The width of the annular groove is w1. The depth of the annular groove is 2±0.2mm. The thicknesses of the two convex edges formed by the annular groove are h1 and h2, respectively, where w1<h1+h2. The thickness of the irregular inner ring before roughing is H, where H=w1+h1+h2, and w1 / H<1 / 2, |h1-h2|≤1. 2) Solution treatment The roughened irregular inner ring is placed in a solution furnace at 1160±5℃ for solution treatment.

2. The processing technology in the forming of irregular inner rings according to claim 1, characterized in that, The processing technology also includes the following steps: 3) Cutting and positioning, using the annular groove as the positioning reference, the irregular inner ring is pressed against the positioning platform from one side of the groove wall.

3. The processing technology in the forming of irregular inner rings according to claim 2, characterized in that, In step 3), the cutting positioning includes front-end machining positioning and rear-end machining positioning. The front-end machining positioning is achieved by a CNC lathe moving the irregular inner ring from one side of the annular groove wall to the rear end face against the positioning platform. The rear-end machining positioning is achieved by rotating the irregular inner ring 180° and then moving the irregular inner ring from the other side of the annular groove wall to the positioning platform from the finished end face.

4. The processing technology in the forming of irregular inner rings according to claim 3, characterized in that, The processing technology also includes the following steps: 4) fine machining and positioning, using the two ends of the annular groove as positioning references, and the irregular inner ring end face fits and contacts.

5. The processing technology in the forming of irregular inner rings according to claim 4, characterized in that, In step 4), 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 precision machined in the contact mode of the end face of the irregular inner ring.

6. The processing technology in the forming of irregular inner rings according to claim 4, characterized in that, In step 4), the two ends of the annular groove are used as positioning references, and the inner wall of the irregular inner ring is finely machined in the contact mode of the end face of the irregular inner ring. Then, the outer wall of the irregular inner ring is finely machined using the inner wall of the irregular inner ring as the positioning reference.