CN114770054A - Method for processing super-huge type precise spherical roller - Google Patents
Method for processing super-huge type precise spherical roller Download PDFInfo
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- CN114770054A CN114770054A CN202210644510.7A CN202210644510A CN114770054A CN 114770054 A CN114770054 A CN 114770054A CN 202210644510 A CN202210644510 A CN 202210644510A CN 114770054 A CN114770054 A CN 114770054A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000003672 processing method Methods 0.000 claims abstract description 10
- 238000005242 forging Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims description 15
- 230000009191 jumping Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/103—Retention by pivotal elements, e.g. catches, pawls
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Abstract
The invention provides a processing method of an oversize precision spherical roller, which comprises the steps that the spherical roller is blanked from a raw material and sequentially subjected to forging, rough turning, fine turning, heat treatment, hard turning and ultra-precision grinding; in the fine turning process, inwards recessed recesses are machined in the center positions of two end parts of the spherical roller, and a tip hole is machined in the center position of the root of the recess at one end of the spherical base surface; the invention replaces the rough grinding and accurate grinding procedures of the prior spherical roller after heat treatment with turning processing, namely, a high-precision numerical control lathe is adopted to clamp the roller once to turn and form the outer diameter cambered surface and the end part spherical base surface of the roller, so that the jumping quantity of the spherical base surface of the roller to the outer diameter surface is 0.002mm after the roller is processed, the precision requirement of the I-grade roller is met, the processing precision of the roller is improved, and the processing method can shorten the whole processing time of the roller and improve the production efficiency.
Description
Technical Field
The invention belongs to the technical field of super-huge type roller processing methods, and particularly relates to a processing method of a super-huge type precise spherical roller.
Background
The bearing is an important part in modern mechanical equipment, and mainly plays the roles of supporting a mechanical rotating body, reducing the friction coefficient in the movement process of the mechanical rotating body and ensuring the rotation precision. The rolling bodies in the bearing are key parts of the bearing and are used for realizing the effect of rotatably supporting the bearing in a mode of rolling contact with the inner ring and the outer ring of the bearing. Specifically, the rolling elements mainly include balls, cylindrical rollers, tapered rollers, spherical rollers, needle rollers, and the like according to different use occasions of the bearing, wherein the outer diameter of the spherical roller and the contact surface of the ferrule form an arc-shaped structure, so as to realize the effects of aligning, high bearing, and high rotation speed. The traditional spherical roller machining process mainly comprises the following steps: forging, rough turning, finish turning, heat treatment, rough grinding, fine grinding, ultra-precision grinding and the like.
At present, for small-size spherical rollers, the machining process can basically meet the precision requirement of the rollers. However, for the spherical roller of the super-huge type bearing, the outer diameter of the roller usually exceeds 60mm, and the precision requirement of the roller is often not achieved by adopting the processing method. The main reasons are that: after the heat treatment, the roller needs to be subjected to two processes of rough grinding and finish grinding, and each process needs to grind the outer diameter and the ball base surface of the roller independently, wherein the grinding processing of the outer diameter adopts a centerless grinder, and the grinding processing of the ball base surface adopts a base surface grinder, namely, after the outer diameter of the roller is subjected to rough grinding and finish grinding by the centerless grinder, the roller ball base surface is subjected to rough grinding and finish grinding by the base surface grinder in different clamping and positioning modes. Therefore, the jumping quantity of the base surface of the roller ball facing the outer diameter surface can not reach the design precision of the roller, and during actual test, the jumping quantity can only reach about 0.05mm, belongs to the class III precision and far cannot reach the requirement of the class I precision. In addition, the way of performing rough grinding and finish grinding by two devices also causes the problem of low processing efficiency of the roller. Therefore, a method for processing an oversized precise spherical roller is needed to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problems and provides a processing method of an oversize precision spherical roller, which replaces the rough grinding and accurate grinding procedures of the existing spherical roller after heat treatment with a turning processing mode, namely, a high-precision numerical control lathe is adopted to clamp the roller once to turn and form the outer diameter cambered surface and the end part spherical base surface of the roller, so that the jumping quantity of the spherical base surface of the roller to the outer diameter surface is 0.002mm after the roller is processed, the precision requirement of an I-grade roller is met, the processing method is favorable for improving the processing precision of the roller, the whole processing time of the roller can be shortened, and the production efficiency is improved.
The technical scheme adopted by the invention is as follows: a processing method of an oversize precision spherical roller comprises the steps that the spherical roller is subjected to forging, rough turning, fine turning, heat treatment, hard turning and ultra-precision grinding in sequence from raw material blanking;
in the fine turning process, inwards recessed recesses are machined in the center positions of two end parts of the spherical roller, and a tip hole is machined in the center position of the root of the recess at one end of the spherical base surface;
the hard turning process comprises the following steps: step one, clamping and positioning the roller, namely correspondingly assembling a recess at the non-working end of the roller on a three-jaw chuck of a lathe, and correspondingly inserting a lathe center into a center hole in the middle of the recess at one end of the base surface of the roller ball to finish clamping and positioning the roller;
turning the outer diameter circumferential surface of the roller; starting the lathe, enabling the roller to rotate along with the lathe spindle in the clamping and positioning state in the step one, and turning the outer diameter surface of the roller by the turning tool in an arc motion track in the roller rotating process until the roller is turned to a specified size;
step three, turning the ball base surface of the roller; and (4) replacing the turning tool, wherein the roller rotates along with the lathe spindle in the clamping and positioning state in the step one, and in the rotating process of the roller, the turning tool turns the base surface position of the ball of the roller until the turning is carried out to the specified size.
In the fine turning procedure, the cavity is in a cylindrical blind hole structure, the depth of the cavity is 3mm, the vertical distance from the inner wall of the cavity to the outer wall of the roller is 10-20mm, and the center line of the cavity and the center line of the tip hole are coincident with the central axis of the spherical roller.
In the first step, three clamping jaws of the lathe are tightly attached to the inner wall of the recess.
In the first step, after the roller is clamped and positioned, a tool retracting gap is reserved between the edge of the recess at one end of the ball base surface of the roller and the outer surface of the lathe center.
In the second step, the turning process of the turning tool on the outer diameter surface of the roller comprises two procedures of rough turning and finish turning, after the rough turning is finished, the size of the outer diameter surface of the roller is 0.08-0.10mm relative to the reserved processing amount of a finished product, after the finish turning is finished, the size of the outer diameter surface of the roller is 0.003-0.006mm relative to the reserved processing amount of the finished product, and the residual amount is the ultra-precision grinding residual amount.
In the third step, the turning process of the roller ball base surface by the turning tool comprises two procedures of rough turning and finish turning, after the rough turning is finished, the reserved processing amount of the roller ball base surface relative to a finished product is 0.04-0.05mm, after the finish turning is finished, the reserved processing amount of the roller ball base surface relative to the finished product is 0.002-0.004mm, and the residual amount is the ultra-precision grinding residual amount.
In the fine turning process, inwards recessed recesses are machined in the center positions of two end portions of the spherical roller, and a tip hole is machined in the center position of the root of the recess at one end of the spherical base surface; the purpose of this is to: the cavity structure is processed at one end of the non-spherical base surface of the roller, so that a three-jaw chuck of a lathe can be placed in the cavity and is tightly attached to the inner wall of the cavity; a centre hole is processed at one end of the ball base surface, so that a centre of a lathe can be correspondingly inserted into the centre hole and is matched with a three-jaw chuck of the lathe to realize clamping and positioning of the roller; and processing out the cave structure in ball base face one end, the leading cause lies in that the ball base face of roller also need carry out the turning, sets up this cave and can insert the downthehole back at top, and the sufficient space is reserved with the edge of cave to top outer wall, when the lathe tool carries out the turning to the ball base face, can play the effect of moving back the sword, avoids lathe tool and top production interference.
In the second step and the third step, the roller is turned in the clamping and positioning state in the first step, and the purpose is to improve the machining precision of the roller and mainly improve the jumping precision of the ball base surface relative to the outer diameter surface; because the turning of the outer diameter surface and the turning of the spherical base surface are both in the same jaw positioning state of the roller, the conditions that different grinding machines and different clamping and positioning modes of the roller are adopted in the prior art can be replaced, the jumping quantity of the spherical base surface relative to the outer diameter surface can reach the precision requirement of the I-grade roller, the form and position tolerance requirement during the design of the spherical roller is met, and the precision machining requirement of the spherical roller is met; in addition, the mode of one-time clamping, positioning and turning molding is adopted, so that the processing time of the roller after heat treatment and before ultra-precision grinding can be shortened, the cost input of equipment is reduced, and the processing efficiency is improved.
The beneficial effects of the invention are as follows:
the invention replaces the rough grinding and accurate grinding procedures of the prior spherical roller after heat treatment with turning processing, namely, a high-precision numerical control lathe is adopted to clamp the roller once to turn and form the outer diameter cambered surface and the end part spherical base surface of the roller, so that the jumping quantity of the spherical base surface of the roller to the outer diameter surface is 0.002mm after the roller is processed, the precision requirement of the I-grade roller is met, the processing precision of the roller is improved, and the processing method can shorten the whole processing time of the roller and improve the production efficiency.
Drawings
FIG. 1 is a block diagram of a spherical roller according to the present invention;
fig. 2 is a schematic view of the spherical roller of the present invention after being mounted and positioned.
In the figure, 1, a first cavity; 2. a second recess; 3. a tip hole; 4. a tip; 5. a three-jaw chuck.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in the figure, the machining method of the super-large type precision spherical roller is suitable for machining the super-large type precision spherical roller, the diameter of the spherical roller is 60-130mm, the material of the spherical roller is GCr5SiMn steel, the surface hardness of the roller obtained finally is 60-64HRC, and the machining method comprises the steps that the spherical roller is subjected to forging, rough turning, fine turning, heat treatment, hard turning and ultra-precision grinding in sequence from raw material blanking;
the raw material blanking, forging, roller rough turning, heat treatment and super-precision grinding processes all adopt conventional processing modes in the prior art, and are not described in detail herein.
In the fine turning process, after the end plane, the end spherical base surface and the outer diameter surface of the roller are machined to specified dimensions in a conventional mode, concave cavities which are concave inwards need to be machined in the center positions of two ends of the spherical roller, and a tip hole 3 is machined in the center position of the root of each concave cavity at one end of the spherical base surface;
specifically, as shown in fig. 1, during finish turning, a first recess 1 is machined at the center of the end surface a of the roller, a second recess 2 is machined at the center of the spherical base surface b of the roller, both recesses are of cylindrical blind hole structures, a tip hole 3 is machined at the middle position of the root of the second recess 2 at the center of the spherical base surface b, and the center lines of both recesses and the center line of the tip hole 3 coincide with the central axis of the spherical roller;
more specifically, the depth of the two pockets is 3mm, the diameter of the pockets is determined according to the actual size of the roller, and the perpendicular distance from the inner wall of the pocket to the outer surface of the roller is 10-20mm, for example, when the maximum outer diameter of the roller is 60mm, the diameter of the pocket is 40 mm.
The hard turning process comprises the following steps: step one, clamping and positioning the roller, namely correspondingly assembling a recess I1 of the non-working end surface a of the roller on a three-jaw chuck 5 of a lathe as shown in a figure 1-2, enabling the outer sides of three jaws of the lathe to be tightly attached to the inner wall of the recess I1, and correspondingly inserting a lathe center 4 into a center hole 3 in the middle of a recess II 2 at one end of a ball base surface b of the roller to finish clamping and positioning the roller;
after the roller is clamped and positioned, a tool retracting gap d is reserved between the edge of the second recess 2 at one end of the ball base surface of the roller and the outer surface of the tip 4 of the lathe, so that when the ball base surface b is turned, the phenomenon that a turning tool interferes with the tip 4 during feeding can be avoided, and the safety factor is improved.
Turning the outer diameter circumferential surface c of the roller; starting the lathe, wherein the roller rotates along with the lathe spindle in the clamping and positioning state in the step one, and in the rotating process of the roller, the turning tool turns the outer diameter circumferential surface c of the roller along the arc motion track until the roller is turned to the specified size; because the roller is a spherical roller, the turning tool needs to perform turning processing along the track of arc motion so as to meet the processing requirement of the spherical roller;
in the step, the turning process of the turning tool on the outer diameter surface of the roller comprises two procedures of rough turning and finish turning, after the rough turning is finished, the size of the outer diameter surface of the roller is 0.08-0.10mm relative to the reserved processing amount of a finished product, after the finish turning is finished, the size of the outer diameter surface of the roller is 0.003-0.006mm relative to the reserved processing amount of the finished product, and the rest processing amount is processed in the super-grinding procedure; the purpose of adopting twice turning is in order to improve the machining precision, avoids once turning and causes the problem that the turning precision can not reach the requirement.
Turning the ball base surface b of the roller; and (3) replacing the turning tool, wherein the roller rotates along with the lathe spindle in the clamping and positioning state in the step one, and in the rotating process of the roller, the turning tool turns the position of the ball base surface b of the roller until the turning is in a specified size, and the movement track of the turning tool is also an arc line so as to meet the processing requirement of the ball base surface b.
The turning process of the lathe tool on the roller ball base surface also comprises two procedures of rough turning and finish turning, after the rough turning is finished, the size of the roller ball base surface b relative to the reserved processing amount of a finished product is 0.04-0.05mm, after the finish turning is finished, the size of the roller ball base surface b relative to the reserved processing amount of the finished product is 0.002-0.004mm, and the rest processing amount is processed in the super-grinding procedure; the purpose of adopting twice turning is to control the consistency of the allowance before the second processing, prevent the inconsistent expansion and contraction caused by the different temperatures in the process of processing the cutter relieving and the parts due to the overlarge allowance dispersion degree, improve the processing precision and avoid the problem that the turning precision cannot meet the requirement caused by one-time turning.
The turning process is carried out on a high-precision numerical control lathe, and parameter data such as the feed amount, the motion trail, the main shaft rotating speed and the like are input into a program of the numerical control lathe through programming, so that the high-precision turning of the roller is realized.
Through actual test comparison, the traditional rough grinding and accurate grinding processes are adopted, and after the roller is completely molded, the jumping quantity of the spherical base surface of the spherical roller relative to the outer diameter surface is about 0.05mm, and the precision is III-level precision. By adopting the hard turning process, the jumping quantity of the ball base surface relative to the outer diameter surface can reach 0.002mm, the precision standard of the I-grade roller is reached, the precision grade of the spherical roller is greatly improved, the equipment investment cost of the roller in the production process is reduced, and the processing time is shortened.
Claims (6)
1. A processing method of an oversize precision spherical roller is characterized by comprising the following steps: the method comprises the steps that a spherical roller is subjected to the processes of forging, rough turning, fine turning, heat treatment, hard turning and ultra-precision grinding in sequence from raw material blanking;
in the fine turning process, inwards recessed recesses are machined in the center positions of two end parts of the spherical roller, and a tip hole is machined in the center position of the root of the recess at one end of the spherical base surface;
the hard turning process comprises the following steps: step one, clamping and positioning the roller, namely correspondingly assembling a recess at the non-working end of the roller on a three-jaw chuck of a lathe, and correspondingly inserting a lathe center into a center hole in the middle of the recess at one end of the base surface of the roller ball to finish clamping and positioning the roller;
turning the outer diameter circumferential surface of the roller; starting the lathe, enabling the roller to rotate along with the lathe spindle in the clamping and positioning state in the step one, and turning the outer diameter surface of the roller by the turning tool in an arc motion track in the roller rotating process until the roller is turned to a specified size;
turning the ball base surface of the roller; and (4) replacing the turning tool, wherein the roller rotates along with the lathe spindle in the clamping and positioning state in the step one, and the turning tool turns the spherical base surface of the roller until the roller is turned to the specified size in the rotating process of the roller.
2. The machining method for the oversize precision spherical roller according to claim 1, characterized by comprising the following steps: in the fine turning process, the recess is of a cylindrical blind hole structure, the depth of the recess is 3mm, the vertical distance from the inner wall of the recess to the outer wall of the roller is 10-20mm, and the center line of the recess and the center line of the center hole are coincident with the central axis of the spherical roller.
3. The machining method of the oversize precision spherical roller according to claim 1, characterized in that: in the first step, three clamping jaws of the lathe are tightly attached to the inner wall of the recess.
4. The machining method for the oversize precision spherical roller according to claim 1, characterized by comprising the following steps: in the first step, after the roller is clamped and positioned, a tool withdrawal gap is reserved between the edge of the recess at one end of the ball base surface of the roller and the outer surface of the lathe center.
5. The machining method of the oversize precision spherical roller according to claim 1, characterized in that: and in the second step, the turning process of the outer diameter surface of the roller by the turning tool comprises two procedures of rough turning and finish turning, after the rough turning is finished, the reserved machining amount of the outer diameter surface of the roller relative to the finished product is 0.08-0.10mm, after the finish turning is finished, the reserved machining amount of the outer diameter surface of the roller relative to the finished product is 0.003-0.006mm, and the residual amount is the ultra-precision grinding residual amount.
6. The machining method of the oversize precision spherical roller according to claim 1, characterized in that: in the third step, the turning process of the turning tool on the roller ball base surface comprises two procedures of rough turning and finish turning, after the rough turning is finished, the size of the roller ball base surface is 0.04-0.05mm relative to the reserved processing amount of a finished product, after the finish turning is finished, the size of the roller ball base surface is 0.002-0.004mm relative to the reserved processing amount of the finished product, and the residual amount is the ultra-precision grinding residual amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210644510.7A CN114770054A (en) | 2022-06-09 | 2022-06-09 | Method for processing super-huge type precise spherical roller |
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| CN202210644510.7A CN114770054A (en) | 2022-06-09 | 2022-06-09 | Method for processing super-huge type precise spherical roller |
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|---|---|---|---|---|
| JP2003071685A (en) * | 2001-09-03 | 2003-03-12 | Nissan Motor Co Ltd | Method of machining integral power roller |
| CN204183258U (en) * | 2014-10-30 | 2015-03-04 | 郑州市长城机器制造有限公司 | Top frock is used in belt pulley processing |
| CN105252223A (en) * | 2015-11-11 | 2016-01-20 | 宝塔实业股份有限公司 | Machining method of extra-large bearing cone rolling bodies with supporting column holes |
| CN106624671A (en) * | 2016-12-09 | 2017-05-10 | 徐玉明 | Processing technology for shaft parts |
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| CN113751733A (en) * | 2021-09-27 | 2021-12-07 | 吉林北方捷凯传动轴有限公司 | Workpiece positioning and clamping device for bell-shaped shell turning machine tool |
-
2022
- 2022-06-09 CN CN202210644510.7A patent/CN114770054A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003071685A (en) * | 2001-09-03 | 2003-03-12 | Nissan Motor Co Ltd | Method of machining integral power roller |
| CN204183258U (en) * | 2014-10-30 | 2015-03-04 | 郑州市长城机器制造有限公司 | Top frock is used in belt pulley processing |
| CN105252223A (en) * | 2015-11-11 | 2016-01-20 | 宝塔实业股份有限公司 | Machining method of extra-large bearing cone rolling bodies with supporting column holes |
| CN106624671A (en) * | 2016-12-09 | 2017-05-10 | 徐玉明 | Processing technology for shaft parts |
| CN110711871A (en) * | 2019-10-30 | 2020-01-21 | 瓦房店轴承集团国家轴承工程技术研究中心有限公司 | Machining process and tool for super-huge spherical roller with central through hole |
| CN113751733A (en) * | 2021-09-27 | 2021-12-07 | 吉林北方捷凯传动轴有限公司 | Workpiece positioning and clamping device for bell-shaped shell turning machine tool |
Non-Patent Citations (1)
| Title |
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| 王庆明编著: "《机械制造工艺学》", 28 February 2017, 华东理工大学出版社, pages: 138 - 141 * |
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