Machining method of ultra-narrow thin-wall series oversized bearing outer space ring

Abstract

The invention relates to a bearing manufacturing technology, in particular to a machining method of an ultra-narrow thin-wall series oversized bearing outer space ring, which comprises the following steps: S1, blanking; selecting a rectangular steel plate; s2, cutting a segmentation groove; dividing grooves are formed between the adjacent space ring blanks; s3, a groove is formed; step S4, edge rolling; taking the A surface of the rectangular steel plate as an inner diameter surface, and rolling the rectangular steel plate into a cylinder; s5, the butt joint of the cylinder is welded; step S6, cutting; step S7, shaping; and S8, the single space ring blank is machined to the size of a finished product. A plurality of space ring blanks are processed at the same time through roll welding, the space ring blanks are fixedly connected in sequence, after the space ring blanks are rolled through a rolling machine, the single space ring blanks are cut out, and finally the single space ring blanks are machined. Deformation of the ultra-narrow thin-wall space ring in the machining process can be reduced to the maximum extent, the material utilization rate is effectively increased, and the product machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to a bearing manufacturing technology, in particular to a method for processing an outer spacer of an extremely narrow, thin-walled series of super-large-size bearings. Background Art

[0002] Schematic diagram of the extremely narrow thin-walled spacer used in a certain type of rolling mill bearing Figure 1 As shown. The ultra-narrow thin-walled spacer has the advantages of thin wall thickness, narrow width, and light weight. This type of spacer is often used in four-row tapered roller bearings in rolling mills. Due to its extremely narrow and thin wall characteristics, when a single spacer is processed according to the conventional processing process of bearing spacers, the specific process is as follows: forging → turning → drilling → grinding. In the above process, because this type of spacer has an ultra-thin wall structure, it is necessary to increase the outer diameter and inner diameter allowance during forging, and the width of this type of spacer is extremely narrow, so it needs to be forged together. During the forging process, a wider cutting knife width needs to be reserved. The schematic diagram of forging cutting is shown in the figure. Figure 2 As shown in the figure, the forging blank uses more material, resulting in a material utilization rate of less than 15%. In the conventional processing process, the more the excess is removed, the easier it is for the workpiece to deform, which not only increases the processing difficulty but also reduces production efficiency. Summary of the invention

[0003] In response to the problems pointed out in the background technology, the purpose of the present invention is to provide a processing method for extremely narrow and thin-walled series of extra-large-size bearing outer spacers, which adopts a rectangular steel plate as a base material, divides a plurality of spacer blanks on the base material, and fixes the plurality of spacer blanks together. After rolling and welding, they are divided into single-piece spacer blanks for machining. This can minimize the deformation of the extremely narrow and thin-walled spacers during the processing, effectively improve material utilization, and improve product processing efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for processing an extremely narrow, thin-walled series of oversized bearing outer spacers comprises the following steps:

[0006] Step S1, cutting: select a rectangular steel plate, plan the number of spacer blanks on the rectangular steel plate according to the size of the spacer, and trim the size of the rectangular steel plate;

[0007] Step S2, opening a dividing groove; opening a dividing groove between the planned spacer blanks on the rectangular steel plate; the two ends of the dividing groove are respectively connected by a connecting portion, and at least one connecting portion is reserved in each dividing groove, so that adjacent spacer blanks are connected by at least three connecting portions;

[0008] Step S3, beveling: processing bevels at both ends of the A surface of the rectangular steel plate;

[0009] Step S4, rolling; using the A surface of the rectangular steel plate as the inner diameter surface, rolling the rectangular steel plate into a cylinder; the inner diameter of the cylinder is smaller than the inner diameter of the spacer, and the outer diameter of the cylinder is larger than the diameter of the spacer;

[0010] Step S5, welding the cylinder butt joint;

[0011] Step S6, cutting; cutting the welded cylinder along the two side walls of the dividing groove into a plurality of spacer blanks;

[0012] Step S7, shaping: using a mold to shape a single spacer blank;

[0013] Step S8, processing the single spacer blank to the finished product size.

[0014] In step S1, the relationship between the thickness S of the selected rectangular steel plate and the thickness S1 of the finished spacer is:

[0015] S=S1+0.5Y (1)

[0016] Among them, Y is determined according to the wall thickness and diameter of the spacer ring, and the value is 1, 2, 3...

[0017] In step S1, the relationship between the number of spacers N and the total width B of the rectangular steel plate is:

[0018] B=N×h+(N-1)×1+3 (2)

[0019]

[0020] Wherein, h is the cutting height of a single outer spacer ring.

[0021] In step S2, the relationship between the number M of connecting parts between adjacent spacer blanks and the circumference L of the spacer is:

[0022]

[0023] Among them, X is determined according to the wall thickness and diameter of the outer spacer, and the selection range is 0.5-5㎜; D is the outer diameter of the spacer, and d is the inner diameter of the spacer.

[0024] In the step S2, after the dividing grooves are formed, evenly distributed oil holes are formed on each spacer blank.

[0025] In step S3, the grooves at both ends of surface A are 45° grooves, and the thickness of the blunt edge of the groove is 2-3 mm.

[0026] In the step S5, when welding the butt joint of the cylinder, first, spot welding is performed at both ends of the butt joint on the inner diameter surface to prevent springback; secondly, an arc-starting plate is welded at one end of the butt joint and an arc-extinguishing plate is welded at the other end, and the cylinder is fixed with the arc-starting plate and the arc-extinguishing plate to prevent weld defects at both ends of the weld during welding, and to prevent the molten pool filling metal at both ends of the weld from being lower than the parent material; then, the inner diameter surface is welded to the butt joint; finally, a carbon arc air gouging is used to perform groove processing on the outer diameter surface of the weld, and then the outer diameter surface is welded to the butt joint.

[0027] In step S8, the process of machining a single spacer blank to the finished product size is: turning the inner diameter and end face → turning the outer diameter, end face and outer diameter groove → fine grinding the end face.

[0028] The beneficial effects of the present invention: the present invention adopts coil welding to process multiple spacer blanks at the same time, the multiple spacer blanks are fixedly connected in sequence, and after being rolled by a rolling machine, individual spacer blanks are divided and finally the individual spacer blanks are machined; the deformation of extremely narrow and thin-walled spacers during the processing process can be minimized, and the material utilization rate is effectively improved, thereby improving the product processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of a certain type of extremely narrow thin-walled spacer.

[0030] Figure 2 This is a schematic diagram of a forging blank of a certain type of extremely narrow thin-walled spacer.

[0031] Figure 3 It is a top view of the rectangular steel plate after cutting and cutting the dividing grooves in the present invention.

[0032] Figure 4 Schematic diagram of the workpiece after welding the cylindrical butt joint.

[0033] Figure 5 This is a three-dimensional view of the workpiece after welding the cylindrical butt joint.

[0034] Figure 6 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Embodiment 1:

[0037] Example 1: The outer diameter D of a certain type of extremely narrow and thin-walled series oversized bearing spacer to be processed is 513mm, the maximum wall thickness S is 7.5mm, the height h is 22.75mm, and there are 12 evenly distributed Ф10 oil holes, which are used for rolling mill bearings.

[0038] According to a method for processing an extremely narrow, thin-walled series of oversized bearing outer spacers provided by the present invention, the bearing spacers of the above-mentioned size are processed, such as Figure 6 As shown, the following steps are included:

[0039] Step S1, blanking; select a rectangular steel plate with a length of 1600 mm, a width of 480 mm, and a thickness of 8.0 mm. According to formula (2), the number of spacers N is 20. After blanking, the length of the steel plate is 1586 mm and the width is 478 mm. The blanking is performed by laser cutting, and uniformly distributed oil holes are processed at the same time;

[0040] Step S2, opening a segmentation groove; Figure 3 As shown, a dividing groove is opened between adjacent spacer blanks; the blanking height of a single spacer is 22.8 mm, and adjacent spacers are connected together using a connecting part with a length of 1 mm and a width of 2 mm, and the number of connecting parts is 4; the dividing groove is also cut by laser;

[0041] Step S3, beveling: using a milling machine to mill the bevel, and processing the bevel at both ends of the A surface of the rectangular steel plate;

[0042] Step S4, rolling; before rolling, the steel plate is cleaned to avoid indentations and scratches on the surface of the steel plate, and the groove of the inner diameter surface and the groove on both sides are polished within a range of 5-8mm; a four-roller rolling machine is used for rolling, and the amount of distortion on both sides of the steel plate is controlled at 0.05mm; with the A surface of the rectangular steel plate as the inner diameter surface, the rectangular steel plate is rolled into a cylinder, the inner diameter of the cylinder is smaller than the inner diameter of the spacer, and the outer diameter of the cylinder is larger than the diameter of the spacer;

[0043] Step S5, welding the butt joint of the cylinder; hoisting the workpiece to the welding platform for welding, the welding wire is Ф1.2mm, the current and voltage are adjusted during the trial welding, and the gas shielded welding is used in the welding process; when welding the butt joint of the cylinder, first, spot welding is performed at both ends of the butt joint on the inner diameter surface to prevent springback; secondly, an arc-starting plate is welded at one end of the butt joint and an arc-extinguishing plate is welded at the other end, and the cylinder is fixed with the arc-starting plate and the arc-extinguishing plate to prevent weld defects at both ends of the weld during welding, and to prevent the molten pool filling metal at both ends of the weld from being lower than the parent material; then, welding the inner diameter surface to the joint; finally, using a carbon arc gouging to perform groove processing on the outer diameter surface of the weld, and then welding the outer diameter surface to the joint; the outer diameter surface welding parameters are the same as the inner side; after welding is completed, the oxide scales on the weld surfaces on both sides are polished to make the weld surface flat and smooth;

[0044] Step S6, cutting; after checking that the weld meets the requirements, remove the connection parts of all the dividing grooves, and cut the welded cylinder into multiple spacer blanks along the two side walls of the dividing grooves; after cutting, it is also necessary to grind the cutting part of each spacer blank;

[0045] Step S7, shaping; using a mold to shape a single spacer blank; due to the large size of the spacer, the one-time shaping cannot control the ellipse of the spacer, so the shaping process uses an upper mold and a lower mold with a trapezoidal support for segmented shaping;

[0046] Step S8, processing a single spacer blank to the finished product size; turning the inner diameter and end face → turning the outer diameter, end face and outer diameter groove → fine grinding the end face.

[0047] Parts of the present invention not described in detail are prior art.

Claims

1. A method for processing extremely narrow and thin-walled series oversized bearing spacers, characterized by: The following steps are involved: Step S1, cutting: select a rectangular steel plate, plan the number of spacer blanks on the rectangular steel plate according to the size of the spacer, and trim the size of the rectangular steel plate; Step S2, opening a dividing groove; opening a dividing groove between the planned spacer blanks on the rectangular steel plate; the two ends of the dividing groove are connected by a connecting portion respectively, and at least one connecting portion is reserved in each dividing groove, so that adjacent spacer blanks are connected by at least three connecting portions; Step S3, beveling: processing bevels at both ends of the A surface of the rectangular steel plate; Step S4, rolling: using the A surface of the rectangular steel plate as the inner diameter surface, rolling the rectangular steel plate into a cylinder; Step S5, welding the cylinder butt joint; Step S6, cutting; cutting the welded cylinder along the two side walls of the dividing groove into a plurality of spacer blanks; Step S7, shaping: using a mold to shape a single spacer blank; Step S8, processing the single spacer blank to the finished product size.

2. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 1 is characterized by: In step S1, the relationship between the thickness S of the selected rectangular steel plate and the thickness S1 of the finished spacer is: S=S1+0.5Y (1) Among them, Y is determined according to the wall thickness and diameter of the spacer ring, and the value is 1, 2, 3...

3. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 2 is characterized by: In step S1, the relationship between the number of spacers N and the total width B of the rectangular steel plate is: B=N×h+(N-1)×1+3 (2) Wherein, h is the cutting height of a single outer spacer ring.

4. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 1 is characterized by: In step S2, the relationship between the number M of connecting parts between adjacent spacer blanks and the circumference L of the spacer is: Among them, X is determined according to the wall thickness and diameter of the outer spacer, and the selection range is 0.5-5㎜; D is the outer diameter of the spacer, and d is the inner diameter of the spacer.

5. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 1 is characterized by: In the step S2, after the dividing grooves are formed, evenly distributed oil holes are formed on each spacer blank.

6. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 1 is characterized by: In step S3, the grooves at both ends of surface A are 45° grooves, and the thickness of the blunt edge of the groove is 2-3 mm.

7. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 1 is characterized by: In the step S5, when welding the butt joint of the cylinder, first, spot welding is performed at both ends of the butt joint on the inner diameter surface to prevent springback; secondly, an arc-starting plate is welded at one end of the butt joint and an arc-extinguishing plate is welded at the other end, and the cylinder is fixed with the arc-starting plate and the arc-extinguishing plate to prevent weld defects at both ends of the weld during welding, and to prevent the molten pool filling metal at both ends of the weld from being lower than the parent material; then, the inner diameter surface is welded to the butt joint; finally, a carbon arc air gouging is used to perform groove processing on the outer diameter surface of the weld, and then the outer diameter surface is welded to the butt joint.

8. The method for processing an extremely narrow, thin-walled series of oversized bearing spacers according to claim 1 is characterized by: In step S8, the process of machining a single spacer blank to the finished product size is: turning the inner diameter and end face → turning the outer diameter, end face and outer diameter groove → fine grinding the end face.

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