Method of lapping the outer raceway of a wide bearing

Abstract

The application relates to a wide bearing outer ring raceway lapping method, and relates to an outer ring raceway lapping method. In order to solve the problems that the upper end face of the outer ring interferes with a lapping head and the oscillation position of an oil stone does not match the raceway position when the outer ring of the wide bearing is lapped by using an existing lapping machine, the application firstly optimizes a lapping tool and an oil stone clamp 1, avoids interference during processing, and meets the lapping processing conditions of the outer ring of the wide bearing; secondly, a sleeve 3-1 is sleeved on an original lapping fulcrum 3, the outer diameter size of the lapping fulcrum 3 is increased, the processing range of the lapping machine is expanded, and the processing capacity is expanded; meanwhile, the hardness of the sleeve made of nonmetallic material is low, the influence on the surface quality is avoided, the appearance quality of the outer ring of the bearing after lapping is improved, and processing marks are eliminated. The application belongs to the technical field of bearing raceway lapping.

Description

Technical Field

[0001] This invention relates to a method for precision grinding of the outer ring raceway, specifically a method for precision grinding of the outer ring raceway of a wide-width bearing, belonging to the field of bearing raceway grinding technology. Background Technology

[0002] To better meet the performance requirements of bearings, the bearing structure design takes into account both the operating environment and installation conditions, and integrates design, such as spring support structure design and structure design with mounting flange. This increases the design difficulty and the manufacturing difficulty, and also places higher demands on the processing capabilities of the equipment.

[0003] A certain type of single-sided short cylindrical roller bearing has an integral mounting plate on its outer ring, and the outer ring width is also over 100mm. Using an existing CNC precision grinding machine presents the following problems:

[0004] The excessive width of the outer ring causes interference between the grinding head and the upper surface of the outer ring during feeding and retraction. Secondly, due to the limitation of the grinding machine's machining stroke, the oscillation position of the honing stone is higher than the raceway position of the ring, thus exceeding the processing range of the existing equipment.

[0005] Secondly, the outer ring of this model has very high precision and surface quality requirements. Even if the existing equipment can meet these requirements, the product quality will be low and the precision will be unstable due to defects in the grinding tooling, which will result in the inability to meet the product's precision requirements.

[0006] In summary, how to propose a refined research method to address the aforementioned technical problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0007] To address the shortcomings of the prior art, this invention provides a method for precision grinding of the outer ring raceway of a wide-width bearing.

[0008] The technical solution of this invention is: a method for precision grinding of the outer ring raceway of a wide-width bearing, which specifically includes the following steps:

[0009] Step 1: Optimize the grinding fixture

[0010] Step 1: Reduce the axial height of the tire pad, increase the cross-sectional area of ​​the tire pad, and ensure that the outer diameter of the tire pad is smaller than the outer diameter of the bearing outer ring.

[0011] Steps 1 and 2: Lengthen the whetstone clamp;

[0012] Step 13: Optimize the grinding fulcrum

[0013] The original grinding fulcrum used a rolling bearing as the fulcrum, and a non-metallic sleeve was fitted on the outer circumference of the original grinding fulcrum.

[0014] Step 2: Assemble the grinding fixture

[0015] Step 21: Install and secure the tire pads onto the precision grinding machine;

[0016] Step 22: Place the outer ring of the bearing to be ground coaxially on the tire pad;

[0017] Steps 2 and 3: Install and fix several grinding fulcrums on the precision grinding machine, ensuring that the grinding fulcrums are distributed at equal angles around the outer ring of the bearing, and that the outer circumferential surface of the sleeve abuts against the outer circumferential surface of the outer ring of the bearing.

[0018] Step 3: Grinding the raceway

[0019] An oilstone is installed on the oilstone fixture, and the outer ring of the bearing to be ground is subjected to rough grinding, fine grinding, semi-finishing grinding, and finishing grinding of the raceway in sequence.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The present invention optimizes the grinding fixture and oilstone clamp 1 to avoid interference during processing and to meet the precision grinding conditions of the outer ring of the wide bearing.

[0022] 2. A sleeve 3-1 is fitted onto the original grinding fulcrum 3, which increases the outer diameter of the grinding fulcrum 3, expands the processing range of the precision grinding machine, and extends its processing capacity.

[0023] 3. Improved the appearance quality of the bearing outer ring after fine grinding, eliminating machining marks. Attached Figure Description

[0024] Figure 1 This is a top view of the optimized grinding fixture of the present invention;

[0025] Figure 2 This is a schematic diagram of the grinding fulcrum 3 set with sleeve 3-1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the tire pad 2 of the present invention;

[0027] Figure 4 This is a cross-sectional view of the optimized grinding fixture of the present invention;

[0028] Figure 5 This is a schematic diagram of the grinding raceway of the present invention.

[0029] In the diagram: 1. Oilstone clamp; 2. Waist pad; 3. Grinding fulcrum; 3-1. Sleeve; 4. Bearing outer ring. Detailed Implementation

[0030] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments.

[0031] Specific implementation method one: Combining Figures 1 to 5 This embodiment describes a method for precision grinding of the outer ring raceway of a wide-width bearing, which is specifically performed according to the following steps:

[0032] Step 1: Optimize the grinding fixture

[0033] Step 1: Reduce the axial height of the pad 2, increase the cross-sectional area of ​​the pad 2, and ensure that the outer diameter of the pad 2 is smaller than the outer diameter of the bearing outer ring 4. This setting increases the contact area between the pad 2 and the end face of the bearing outer ring 4, enhances the clamping stability during processing, and reduces the depth of the imprint caused by the pad 2 on the end face of the bearing outer ring 4.

[0034] Step 1 and 2: Lengthen the length of the oilstone clamp 1. By setting it up in this way, the oilstone is positioned exactly on the raceway by "lowering the height of the tire pad 2 and lengthening the length of the oilstone clamp 1", and no interference will occur during the processing.

[0035] Step 13: Optimize the grinding fulcrum 3

[0036] The original grinding fulcrum 3 uses a rolling bearing as the fulcrum, and a non-metallic sleeve 3-1 is fitted on the outer circumference of the original grinding fulcrum 3. Since the original grinding fulcrum 3 is in close contact with the outer ring 4 of the bearing during the grinding process and rotates at high speed with the outer ring 4 of the bearing, it is easy to cause obvious marks on the outer circumference of the outer ring 4 of the bearing, which will affect the surface quality of the product. The non-metallic sleeve 3-1 has low hardness, which avoids affecting the surface quality, and at the same time increases the outer diameter of the grinding fulcrum 3, expanding its application range.

[0037] Step 2: Assemble the grinding fixture

[0038] Step 2: Install and secure tire pad 2 onto the precision grinding machine;

[0039] Step 22: Place the outer ring 4 of the bearing to be ground coaxially on the pad 2;

[0040] Steps 2 and 3: Install and fix several grinding fulcrums 3 on the precision grinding machine, and ensure that the grinding fulcrums 3 are distributed at equal angles around the outer ring 4 of the bearing, and that the outer circumferential surface of the sleeve 3-1 abuts against the outer circumferential surface of the outer ring 4 of the bearing.

[0041] Step 3: Grinding the raceway

[0042] An oilstone is installed on the oilstone fixture 1, and the outer ring 4 of the bearing to be ground is subjected to rough grinding, fine grinding, semi-finishing grinding and finishing grinding of the raceway in sequence.

[0043] Specific Implementation Method Two: Combining Figure 1 , Figure 4 and Figure 5 In this embodiment, steps one and two involve lengthening the whetstone clamp 1 by 30mm. Since the width of the bearing outer ring 4 exceeds the conventional size, the whetstone clamp 1 needs to be lengthened as a whole. At the same time, the working stroke of the equipment needs to be considered to avoid interference during processing. Based on the height of the pad 2 and the working stroke of the whetstone clamp 1, the whetstone clamp 1 is lengthened by 30mm, which satisfies the processing conditions of the bearing outer ring 4 and ensures the processing quality.

[0044] Furthermore, in step one three, the sleeve 3-1 is made of nylon.

[0045] Furthermore, in steps two and three, three grinding fulcrums 3 are installed on the fine grinding machine.

[0046] Furthermore, in step three, a Dalman CB6 or CB12 type oilstone grinding raceway is selected; in this embodiment, the thickness of the oilstone is 16mm. The thinner oilstone thickness reduces the contact area for fine grinding and improves the straightness of fine grinding.

[0047] The other components and connections are the same as in Specific Implementation Method 1.

[0048] Specific implementation method three: Combining Figures 1 to 5 This embodiment describes a method where, in step three, a Dalman CB12 type oilstone is used for rough grinding of the raceway, and the processing parameters are as follows:

[0049] The processing time is 10 seconds, the spindle speed is 125 r / min, the oilstone oscillation frequency is 1200 times / min, and the oilstone pressure is 100 N.

[0050] Furthermore, in step three, a Dalman CB12 type oilstone is used for grinding during the fine grinding of the raceway, and the processing parameters are as follows:

[0051] The processing time is 8 seconds, the spindle speed is 138 r / min, the oilstone oscillation frequency is 1100 times / min, and the oilstone pressure is 100 N.

[0052] Furthermore, in step three, during the semi-finishing of the raceway, a Dalman CB6 type oilstone is used for grinding, and the processing parameters are as follows:

[0053] The processing time is 6 seconds, the spindle speed is 138 r / min, the oilstone oscillation frequency is 1000 times / min, and the oilstone pressure is 100 N.

[0054] Furthermore, in step three, a Dalman CB6 type oilstone is used for grinding the raceway, and the processing parameters are as follows:

[0055] The processing time is 3 seconds, the spindle speed is 156 r / min, the oilstone oscillation frequency is 450 times / min, and the oilstone pressure is 100 N.

[0056] The other components and connections are the same as in specific implementation method one or two.

[0057] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments without departing from the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for precision grinding of the outer ring raceway of a wide-width bearing, characterized in that: This method is specifically carried out in the following steps: Step 1: Optimize the grinding fixture Step 1: Reduce the axial height of the pad (2), increase the cross-sectional area of ​​the pad (2), and ensure that the outer diameter of the pad (2) is smaller than the outer diameter of the bearing outer ring (4); Step 12: Lengthen the oilstone clamp (1) by 30mm; Step 13: Optimize the grinding fulcrum (3) The original grinding fulcrum (3) uses a rolling bearing as the fulcrum, and a non-metallic sleeve (3-1) is fitted on the outer circumference of the original grinding fulcrum (3). Step 2: Assemble the grinding fixture Step 2: Install and secure the tire pad (2) on the precision grinding machine; Step 22: Place the outer ring (4) of the bearing to be ground coaxially on the pad (2); Step 2 and 3: Install and fix several grinding fulcrums (3) on the precision grinding machine, and ensure that the grinding fulcrums (3) are distributed at equal angles around the outer ring (4) of the bearing, and that the outer circumferential surface of the sleeve (3-1) abuts against the outer circumferential surface of the outer ring (4) of the bearing. Step 3: Grinding the raceway Use Dalman CB6 or CB12 type oilstones to grind the raceway. Install oilstones on the oilstone fixture (1) and perform rough grinding, fine grinding, semi-fine grinding and fine grinding of the outer ring (4) of the bearing to be ground in sequence. When rough grinding the raceway, a Dalman CB12 type oilstone is used for grinding, and the processing parameters are: processing time is 10s, spindle speed is 125r / min, oilstone oscillation frequency is 1200 times / min, and oilstone pressure is 100N. When fine grinding the raceway, a Dalman CB12 type oilstone is used for grinding, and the processing parameters are: processing time is 8s, spindle speed is 138r / min, oilstone oscillation frequency is 1100 times / min, and oilstone pressure is 100N.

2. The method for precision grinding of the outer ring raceway of a wide-width bearing according to claim 1, characterized in that: The sleeve (3-1) in step one and three is made of nylon.

3. The method for precision grinding of the outer ring raceway of a wide-width bearing according to claim 1, characterized in that: In steps two and three, three grinding fulcrums (3) are installed on the precision grinding machine.

4. The method for precision grinding of the outer ring raceway of a wide-width bearing according to claim 1, characterized in that: In step three, during the semi-finishing of the raceway, a Dalman CB6 type oilstone is used for grinding, and the processing parameters are as follows: The processing time is 6 seconds. The spindle speed is 138 r / min. The oilstone oscillation frequency is 1000 times / min. The pressure of the oilstone is 100N.

5. The method for precision grinding of the outer ring raceway of a wide-width bearing according to claim 1, characterized in that: In step three, when finely grinding the raceway, a Dalman CB6 type oilstone is used for grinding, and the processing parameters are as follows: The processing time is 3 seconds. The spindle speed is 156 r / min. The oilstone oscillation frequency is 450 times / min. The pressure of the oilstone is 100N.

Images