A processing method for thin-walled ring

Abstract

The present invention discloses a method for processing thin-walled rings, which is specifically implemented according to the following steps: step 1, using conventional technology to process thin-walled ring blanks; step 2, processing a jig as a special tooling for installation and positioning; step 3, after the thin-walled ring is semi-finished for the first time in step 1, the jig in step 2 is used to install the thin-walled ring on the jig for subsequent semi-finishing and final finishing. The present invention reduces the multi-station clamping alignment error, the dimensional error and the shape and position error caused by thermal deformation during processing of the thin-walled ring. The dimensional tolerances and shape and position accuracy of the thin-walled ring processed by the present invention strictly meet the requirements of the drawings, thereby significantly improving the working accuracy, stability and service life of the 820 rolling mill, greatly reducing the scrap rate and concession utilization rate of the thin-walled ring in the processing and manufacturing process, having good economic benefits, and worthy of promotion and wide application.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical equipment processing and manufacturing, and relates to a processing method of a thin-walled ring. Background Art

[0002] Thin-walled ring sleeve parts are widely used in the field of heavy machinery and equipment, and are important components of some rolling mill roll systems. Take a thin-walled ring on the 820 rolling mill as an example: although the thin-walled ring structure is simple, the dimensional tolerance and form and position tolerance are very high, especially the form and position tolerance, including the dimensional tolerance between 0.025mm and 0.05mm, and the coaxiality requirement of each outer circle and inner hole in the form and position tolerance is 0.015mm, and the total runout requirement of each end face and outer circle is 0.02mm. The key is that the thinnest wall thickness is only 10mm, the part structure has poor rigidity, and it is very easy to produce deformation during station change, large alignment error and processing heat deformation during processing and manufacturing, so it has very high requirements for processing and manufacturing technology.

[0003] The conventional method for processing thin-walled rings is: on a lathe (either a horizontal lathe or a vertical lathe), changing stations for multiple times during the processing, rough turning of the inner hole, outer circle and each end face → multiple changes in stations for multiple times, first semi-finishing turning of the inner hole, outer circle and each end face → multiple changes in stations for multiple times, second semi-finishing turning of the inner hole, outer circle and each end face → multiple changes in stations for multiple times, and finishing turning of the inner hole, outer circle and each end face to the drawing. Since there are multiple changes in stations for multiple times of clamping and alignment during the semi-finishing and finishing processes, and the rigidity of the part structure is poor, no matter how the cutting parameters are controlled and adjusted, large clamping deformation, alignment error and processing thermal deformation will occur, resulting in its dimensional tolerance and form and position tolerance cannot strictly meet the requirements of the drawing, and it can only be scrapped or used as a second choice. Summary of the invention

[0004] The purpose of the present invention is to provide a method for processing a thin-walled ring, which solves the problems of high process difficulty and low qualified rate of finished products in the existing method for processing thin-walled rings.

[0005] The technical solution adopted by the present invention is a method for processing a thin-walled ring, which is specifically implemented according to the following steps:

[0006] Step 1: Processing a thin-walled ring blank using conventional technology;

[0007] Step 2: Processing the jig as a special tool for installation and positioning;

[0008] Step 3: After the thin-walled ring is semi-finished for the first time in step 1, the thin-walled ring is mounted on the jig using the jig in step 2 for subsequent semi-finishing and final finishing.

[0009] The present invention is also characterized in that:

[0010] The specific process of step 1 is: first put the thin-walled ring blank on the lathe, change the station for clamping several times during the processing, and rough turn the inner hole, outer circle and each end face; remove the thin-walled ring, leave it for 2 to 3 days, put the thin-walled ring blank on the lathe, change the station for clamping several times, and semi-finish turn the inner hole, outer circle and each end face for the first time; remove the thin-walled ring again, leave it for 2 to 3 days, put the thin-walled ring on the vertical lathe again, use the pressure plate clamping method, semi-finish turn the thin-walled ring again, and finish turn the positioning hole of the thin-walled ring to reach the figure. The thin-walled ring includes an end face a to be processed located on the upper surface and an end face c to be processed located on the lower surface. A positioning hole is opened between the end face a to be processed and the end face c to be processed, and the thin-walled ring can be removed.

[0011] In step 2, the mold includes a circular plate with a lifting mounting hole in the center of the circular plate, a first step is downwardly opened on the upper outer wall of the circular steel plate, the curved edge of the first step is the reference outer circle b, a second step is upwardly opened on the lower outer wall of the circular steel plate, the curved edge of the second step is the reference outer circle a, the depth of the first step is not greater than that of the second step, the curved edge between the second step is a positioning cone circle, and the upper surface of the second step is the reference end face.

[0012] The positioning cone is in the form of a cone-shaped cone structure with a larger top and a smaller bottom, and the positioning hole serves as a reference hole matched with the positioning cone.

[0013] The mold is made in one piece by flame cutting a lifting and mounting hole in the center of a circular steel plate.

[0014] Step 3 is implemented as follows:

[0015] Install the thin-walled ring sleeve on the positioning cone of the mold, and use the copper rod to evenly knock the end surface c of the thin-walled ring to be processed from top to bottom, left to right. At the position close to the lifting and mounting hole, the thin-walled ring is elastically locked and fixed firmly through the positioning cone;

[0016] Lift the jig onto the lathe through the lifting and mounting hole, clamp the jig's lifting and mounting hole with the lathe chuck's reverse claw, start the lathe, and find the jig by the reference outer circle a, reference end face, and reference outer circle b on the jig;

[0017] The thin-walled ring also includes a step formed downward around the outer diameter of the positioning hole on the end face a to be processed, the curved surface of the step is the outer circle a to be processed, the horizontal upper surface of the step is the end face b to be processed, and the curved surface of the bottom edge of the step is the outer circle b to be processed; the thin-walled ring is processed in the order of the end face c to be processed, the outer circle b to be processed, the end face b to be processed, the outer circle a to be processed, and the end face a to be processed in the secondary semi-finishing turning;

[0018] The end face c to be machined, the outer circle b to be machined, the end face b to be machined, the outer circle a to be machined and the end face a to be machined on the thin-walled ring are machined three times and half; the end face c to be machined, the outer circle b to be machined, the end face b to be machined, the outer circle a to be machined and the end face a to be machined on the thin-walled ring are all finished as shown in the figure.

[0019] The beneficial effects of the present invention are as follows: the processing method of the thin-walled ring of the present invention ensures that the stability of the finished product qualification rate of the thin-walled ring during processing is significantly improved, making it possible to process and manufacture the thin-walled ring in a completely qualified manner, and making the overall performance of the 820 rolling mill tend to be excellent. By using this method, the processing of the thin-walled ring on the 820 rolling mill becomes more convenient and reliable, and the tooling structure is simple, the process operation is convenient, and the practicability is strong, which solves the problems of the existing method for processing thin-walled rings, which has great process difficulty and low finished product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of a thin-walled ring on a rolling mill 820, which is a processing object of the present invention;

[0021] Figure 2 yes Figure 1 Top view of thin-walled ring on the 820 rolling mill;

[0022] Figure 3 It is a front view of the tire mold used in the method of the present invention;

[0023] Figure 4 yes Figure 3 A top view of the middle mold;

[0024] Figure 5 This is a main view assembly drawing of the thin-walled ring when the outer circle and end face are turned by the method of the present invention;

[0025] Figure 6 The present invention is a top view assembly drawing of the outer circles and end faces of thin-walled rings when the method of the present invention is used for turning.

[0026] In the figure, 1. thin-walled ring, 2. positioning hole, 3. jig, 4. reference outer circle a, 5. reference end face, 6. positioning cone circle, 7. reference outer circle b, 8. lifting and mounting hole, 9. end face a to be processed, 10. outer circle a to be processed, 11. end face b to be processed, 12. outer circle b to be processed, 13. end face c to be processed. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The present invention provides a method for processing a thin-walled ring, which is specifically implemented according to the following steps:

[0029] Step 1: Processing a thin-walled ring blank using conventional technology;

[0030] The specific process of step 1 is as follows:

[0031] First, the thin-walled ring blank is put on the lathe, and the station is changed for clamping several times during the processing, and the inner hole, outer circle and each end face are roughly turned; the thin-walled ring 1 is removed and left for 2 to 3 days, and the thin-walled ring blank is put on the lathe, and the station is changed for clamping several times, and the inner hole, outer circle and each end face are semi-finished for the first time; the thin-walled ring 1 is removed again, and left for 2 to 3 days, and the thin-walled ring 1 is put on the vertical lathe again, and the pressure plate is used for clamping, and the positioning hole 2 of the thin-walled ring 1 is semi-finished for the second time. As shown in the figure, Figure 1 and Figure 2 As shown, the thin-walled ring 1 includes an end surface a9 to be processed located on the upper surface and an end surface c13 to be processed located on the lower surface. A positioning hole 2 is provided between the end surface a9 to be processed and the end surface c13 to be processed, and the thin-walled ring 1 can be removed.

[0032] Step 2, processing the jig 3 as a special tool for installation and positioning;

[0033] The processing of the mold 3 in step 2 is specifically carried out according to the following steps: Figure 3 and Figure 4 As shown, the jig 3 includes a circular plate with a lifting and mounting hole 8 in the center of the circular plate, a first step is downwardly provided on the upper outer wall of the circular steel plate, and the curved edge of the first step is the reference outer circle b7, a second step is upwardly provided on the lower outer wall of the circular steel plate, and the curved edge of the second step is the reference outer circle a4, the depth of the first step is not greater than that of the second step, the curved edge between the second step and the second step is a positioning cone circle 6, and the upper surface of the second step is the reference end face 5.

[0034] The positioning cone 6 is a conical cone structure with a larger upper portion and a smaller lower portion. The positioning hole 2 is used as a reference hole matched with the positioning cone 6 . The positioning cone 6 is used to achieve the size accuracy and shape accuracy requirements of the positioning hole 2 .

[0035] The jig 3 is integrally processed by flame cutting a lifting and clamping hole 8 in the center of a circular steel plate. The lifting and clamping hole 8 is used for lifting the jig 3 and clamping and fixing the jig 3 on a lathe during processing; the reference outer circle a4 and the reference outer circle b7 are both used for radial positioning and alignment of the jig 3 during processing, and play a leading role in alignment; the reference end face 5 is used for axial positioning and alignment of the jig 3 during processing.

[0036] Step 3: After the thin-walled ring 1 is semi-finished for the first time in step 1, the thin-walled ring 1 is mounted on the jig 3 in step 2 for subsequent semi-finishing and final finishing.

[0037] Step 3: Position the positioning hole 2 and elastically lock it on the jig 3. With the structural characteristics of the thin-walled ring 1, which has poor rigidity and good elasticity, when the thin-walled ring 1 is subjected to force on the large diameter of the upper part of the positioning cone 6, it is elastically locked and fixed firmly. The assembly diagram of the outer circle and end surface of the thin-walled ring 1 is turned by the jig 3, as shown in FIG. Figure 5 and Figure 6 As shown, the specific implementation steps are as follows:

[0038] Install the thin-walled ring 1 on the positioning cone 6 of the mold 3, and use a copper rod to evenly knock the end surface c13 of the thin-walled ring 1 to be processed from top to bottom, left to right. At the position close to the lifting and mounting hole 8, the thin-walled ring 1 is elastically locked and fixed firmly through the positioning cone 6;

[0039] The jig 3 is hoisted onto the lathe through the hoisting and mounting hole 8, the lathe chuck reverse claw clamps the hoisting and mounting hole 8 of the jig 3, the lathe is started, and the jig 3 is aligned through the reference outer circle a4, the reference end face 5, and the reference outer circle b7 on the jig 3;

[0040] The thin-walled ring 1 also includes a step formed downward around the outer diameter of the positioning hole 2 on the end face a9 to be processed, the curved surface of the step is the outer circle a10 to be processed, the horizontal upper surface of the step is the end face b11 to be processed, and the curved surface of the bottom edge of the step is the outer circle b12 to be processed; the thin-walled ring 1 is processed in the order of the end face c13 to be processed, the outer circle b12 to be processed, the end face b11 to be processed, the outer circle a10 to be processed, and the end face a9 to be processed in the secondary semi-finishing turning;

[0041] The end face c13 to be machined, the outer circle b12 to be machined, the end face b11 to be machined, the outer circle a10 to be machined and the end face a9 to be machined on the thin-walled ring 1 are machined three times and half; the end face c13 to be machined, the outer circle b12 to be machined, the end face b11 to be machined, the outer circle a10 to be machined and the end face a9 to be machined on the thin-walled ring 1 are machined until they all reach the figure, and the process is completed.

[0042] The present invention provides a processing method for a thin-walled ring. During the turning process, reasonable and appropriate cutting parameters are selected, and the cutting fluid is sufficiently cooled during semi-finishing and finishing turning to prevent the thin-walled ring 1 from thermal deformation during the turning process due to insufficient cooling or unreasonable selected cutting parameters. At the same time, during semi-finishing and finishing turning, the processing method and process flow must strictly follow the processing sequence of first processing the end face c13 → then processing the outer circle b12 → then processing the end face b11 → then processing the outer circle a10 → finally processing the end face a9, so as to prevent the processing sequence from being confused or even reversed, thereby damaging the "elastic locking" effect of the positioning cone 6, weakening or failing, and causing the thin-walled ring 1 to loosen axially from the jig 3 or even fall off.

[0043] In the processing method of a thin-walled ring of the present invention, the reference outer circle a4, the reference end face 5, the positioning cone circle 6 and the reference outer circle b7 on the jig 3 are also key functional surfaces. Not only the size accuracy and shape accuracy of the positioning cone circle 6 are required to be very high, but also the shape accuracy of the reference outer circle a4, the reference end face 5 and the reference outer circle b7 is required to be very high, and there are positional accuracy requirements that are more stringent than the size accuracy and shape accuracy. The positioning hole 2 and the end face a9 to be processed, the outer circle a10 to be processed, the end face b11 to be processed, the outer circle b12 to be processed, and the end face c13 to be processed on the thin-walled ring 1 are all key functional surfaces. Not only the size accuracy is required to be very high, but there are shape and positional accuracy requirements that are more stringent than the size accuracy. The setting, shape, size selection and processing of the reference outer circle a4, reference end face 5, positioning cone circle 6 and reference outer circle b7 of the jig 3 mainly consider the functional requirements; while the selection of the total thickness of the jig 3, the shape, position and diameter size setting of the lifting mounting hole 8 need to comprehensively consider the dual requirements of its structural rigidity and functionality.

[0044] The various settings of the special tooling jig 3 adopted in the present invention, in addition to considering many factors such as its structural rigidity, functional requirements, dimensional and geometric tolerances, surface roughness requirements matching the dimensional and geometric tolerances, and safety and reliability, are most importantly aimed at the high-precision dimensional tolerances and more stringent high geometric accuracy requirements that are ultimately achieved by the semi-finishing and finishing machining of the outer circles and end faces on the thin-walled ring 1, so that it has compatible dimensional accuracy and geometric accuracy requirements.

[0045] The special tooling jig 3 used in the present invention has a simple structure, convenient actual operation process, good processability, high positioning accuracy, and strong practicality. It is particularly suitable for batch processing of thin-walled ring sleeve parts, which greatly reduces the multi-station clamping alignment error, dimensional error, and shape and position error caused by thermal deformation during processing of the thin-walled ring of the 820 rolling mill. Therefore, its dimensional tolerances and shape and position accuracy strictly meet the requirements of the drawings, thereby significantly improving the working accuracy, stability, and service life of the 820 rolling mill. The use of the present invention to turn the outer circles and end faces of the thin-walled rings also greatly reduces the scrap rate and concession utilization rate of the thin-walled rings during the processing and manufacturing process, thereby bringing good economic benefits and is worthy of promotion and wide application.

Claims

1. A method for processing a thin-walled ring, characterized in that: Follow the steps below to implement it: Step 1, first put the thin-walled ring blank on the lathe, change the station for clamping several times during the processing, and rough-turn the positioning hole, outer circle and each end face; remove the thin-walled ring (1), leave it for 2 to 3 days, put the thin-walled ring blank on the lathe, change the station for clamping several times, and semi-finish turn the positioning hole, outer circle and each end face for the first time; remove the thin-walled ring (1) again, leave it for 2 to 3 days, put the thin-walled ring (1) on the vertical lathe again, use the pressure plate clamping method, and semi-finish turn and finish turn the positioning hole (2) of the thin-walled ring (1) to reach the drawing, the thin-walled ring (1) includes a to-be-machined end face a (9) located on the upper surface and a to-be-machined end face c (13) located on the lower surface, and a positioning hole (2) is provided between the to-be-machined end face a (9) and the to-be-machined end face c (13), and the thin-walled ring (1) can be removed; Step 2, processing a jig (3) as a special tool for installation and positioning; the jig (3) comprises a circular plate, a lifting and mounting hole (8) is provided at the center of the circular plate, a first step is provided downwardly from the upper part of the outer wall of the circular steel plate, the curved edge of the first step is the reference outer circle b (7), a second step is provided upwardly from the lower part of the outer wall of the circular steel plate, the curved edge of the second step is the reference outer circle a (4), the depth of the first step is not greater than that of the second step, the curved edge between the second step and the second step is the positioning cone circle (6), and the upper surface of the second step is the reference end face (5); Step 3, the thin-walled ring (1) processed in step 1 is mounted on the positioning cone (6) of the jig (3), and the end surface c (13) to be processed of the thin-walled ring (1) is evenly struck upward, downward, leftward and rightward with a copper rod, and the thin-walled ring (1) is elastically locked and fixed securely at a position close to the lifting clamp hole (8) by the positioning cone (6); The jig (3) is hoisted onto the lathe through the hoisting and mounting hole (8), the lathe chuck reverse claw clamps the hoisting and mounting hole (8) of the jig (3), the lathe is started, and the jig (3) is aligned through the reference outer circle a (4), the reference end face (5), and the reference outer circle b (7) on the jig (3); The thin-walled ring (1) further comprises a step formed downwardly around the outer diameter of the positioning hole (2) on the end face a (9) to be processed, the curved surface of the step is the outer circle a (10) to be processed, the horizontal upper surface of the step is the end face b (11) to be processed, and the curved surface of the bottom edge of the step is the outer circle b (12) to be processed; the thin-walled ring (1) is semi-finished turned twice and processed in the order of the end face c (13) to be processed, the outer circle b (12) to be processed, the end face b (11) to be processed, the outer circle a (10) to be processed, and the end face a (9) to be processed; The end face c (13), the outer circle b (12), the end face b (11), the outer circle a (10) and the end face a (9) to be processed on the thin-walled ring (1) are machined by three-time semi-finish turning; the end face c (13), the outer circle b (12), the end face b (11), the outer circle a (10) and the end face a (9) to be machined on the thin-walled ring (1) are machined by fine turning.

2. A method for processing a thin-walled ring according to claim 1, characterized in that: The positioning cone (6) is a conical cone structure that is larger at the top and smaller at the bottom, and the positioning hole (2) serves as a reference hole that matches the positioning cone (6).

3. A method for processing a thin-walled ring according to claim 1, characterized in that: The jig (3) is integrally formed by flame cutting a lifting and mounting hole (8) at the center of a circular steel plate.

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