CN111515616A - Machining method of precision bearing seat - Google Patents
Machining method of precision bearing seat Download PDFInfo
- Publication number
- CN111515616A CN111515616A CN201911034707.3A CN201911034707A CN111515616A CN 111515616 A CN111515616 A CN 111515616A CN 201911034707 A CN201911034707 A CN 201911034707A CN 111515616 A CN111515616 A CN 111515616A
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- CN
- China
- Prior art keywords
- workpiece
- excircle
- precision
- turning
- inner hole
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/01—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor for combined grinding of surfaces of revolution and of adjacent plane surfaces on work
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention relates to a method for processing a precision bearing seat, which comprises the following steps: preparing materials: the blank is a precision die forging; rough turning: clamping the forge piece by using a three-jaw chuck hard jaw on a common numerical control lathe, roughly turning the excircle and the excircle end surface of the forge piece, turning the forge piece around, clamping the forge piece by using the three-jaw chuck hard jaw, roughly turning the other excircle end surface and the excircle, and roughly boring the inner hole and the inner hole end surface of the forge piece; and (3) heat treatment: annealing the roughly turned workpiece; finish turning: clamping the heat-treated workpiece by using a three-jaw chuck hard jaw on a precise numerical control lathe, and finely turning the excircle, the cutting groove and the excircle end face of the workpiece; clamping by using a three-jaw chuck soft jaw, finely turning the other end face of the outer circle, and finely boring an inner hole and the end face of the inner hole; and (3) cold treatment: performing cold treatment on the workpiece after finish turning; fine grinding: and clamping the cold-treated workpiece by using the precision grinding clamp of the bearing seat at one time, and finishing grinding the inner hole, the outer circle and the end face of the workpiece on a precision universal numerical control grinding machine to finish machining the bearing seat. By adopting the method, the processing precision is high and the production efficiency is high.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a machining method of a precision bearing seat.
Background
The invention relates to a high-frequency main shaft, which is called as direct transmission main shaft in some cases, and is called as electric main shaft for short, it is a new technology that the main shaft of machine tool and main shaft motor are integrated into one body, it is also a built-in motor main shaft unit, it shortens the length of main transmission chain of machine tool to zero, and realizes the zero transmission of machine tool, and it has the advantages of compact structure, high mechanical efficiency, high rotation speed, high rotation precision, low noise and small vibration, so it has more and more extensive application in modern numerical control machine tool.
The bearing seat is a very critical precision part in the electric spindle, a bearing and a spindle are arranged in the bearing seat, the manufacturing precision of the bearing seat directly influences the service life of the electric spindle, the requirement on the size precision of the bearing seat is high, the size precision of an inner hole is generally required to be within 0.005mm, the form and position tolerance is also high, the cylindricity of the inner hole is generally required to be within 0.002mm, the coaxiality and the end face run-out of the inner hole and an outer circle are generally required to be within 0.002mm, a precise numerical control universal grinding machine is generally adopted for grinding the inner circle, the outer circle and the end face of the inner circle by the finish machining of the bearing seat, due to the special structure of the bearing seat, the inner hole and the outer circle are generally required to be clamped twice, the second clamping is adjusted by taking the. In addition, the bearing seat is easy to deform in the using process, so that the precision of the electric spindle is unstable, and the service life is short.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the machining method of the precision bearing seat is high in machining precision and production efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a machining method of a precision bearing seat comprises the following steps:
step 1) material preparation: the blank is a forging forged piece forged by a precision die;
step 2) rough turning: clamping the forge piece by using a three-jaw chuck hard jaw on a common numerical control lathe, roughly turning the end surface of the excircle and the excircle of the forge piece, turning the forge piece around, clamping the forge piece by using the three-jaw chuck hard jaw, roughly turning the end surface and the excircle of the other excircle of the forge piece, and roughly boring the inner hole and the end surface of the inner hole of the forge piece;
step 3) heat treatment: annealing the roughly turned workpiece;
step 4), finish turning: clamping the heat-treated workpiece by using a three-jaw chuck hard jaw on a precise numerical control lathe, and finely turning the excircle, the cutting groove and the excircle end face of the workpiece; then clamping by using a three-jaw chuck soft jaw, finely turning the other excircle end face of the workpiece, and finely boring an inner hole and an inner hole end face;
step 5) cold treatment: performing cold treatment on the workpiece after finish turning;
step 6), fine grinding: and clamping the cold-treated workpiece by using the precision grinding clamp of the bearing seat at one time, and finishing grinding the inner hole, the outer circle and the end face of the workpiece on a precision universal numerical control grinding machine to finish machining the bearing seat.
Furthermore, in the step 2 in the above technical scheme, a finish machining allowance of 2-2.5 mm is reserved on the excircle of the workpiece, and a finish machining allowance of 1-1.5 mm is reserved on the excircle end face of the workpiece.
Furthermore, in the step 4 in the technical scheme, a fine grinding allowance of 0.2-0.4 mm is reserved for the excircle of the workpiece, and a fine grinding allowance of 0.05-0.1 mm is reserved for the excircle end face of the workpiece.
Further, in the step 6 in the above technical scheme, the bearing seat precision grinding fixture has a fixture body which is once clamped on the three-jaw chuck of the universal numerical control precision grinding machine, a core shaft is installed in a positioning hole of the fixture body through a first screw, an expansion sleeve for positioning and clamping the workpiece is sleeved on the outer circle of the core shaft, a positioning sleeve is installed between the fixture body and the workpiece through a second screw, and a hook-shaped pressing plate which is convenient for the universal numerical control precision grinding machine to accurately grind the inner hole and the end face of the inner hole of the workpiece is installed on the positioning sleeve through a set screw; the clamp is also provided with a gasket which is arranged in an inner hole of the workpiece through a third screw and is convenient for the universal numerical control precision grinding machine to carry out fine grinding on the outer circle and the end surface of the outer circle of the workpiece.
Further, in the technical scheme, the gap between the expansion sleeve and the workpiece is 0.02-0.03 mm.
Furthermore, in the application method of the bearing seat precision grinding clamp in the above technical scheme, the first screw is firstly screwed, the mandrel axially moves along the positioning hole of the clamp body to drive the expansion sleeve to axially move along the positioning hole of the clamp body, the outer circle of the expansion sleeve gradually becomes larger, and the positioning and clamping of the expansion sleeve and the workpiece are realized; then the third screw is screwed down, so that the gasket and the third screw can further clamp the workpiece; then, accurately grinding the outer circle and the end face of the outer circle of the workpiece by using a precision universal numerical control grinding machine; further screwing the set screw to realize the positioning and clamping of the positioning sleeve, the hook-shaped pressing plate and the set screw on the workpiece, loosening the third screw and removing the gasket; and then, carrying out fine grinding on the inner hole and the end face of the inner hole of the workpiece by using a precision universal numerical control grinding machine.
The invention has the beneficial effects that: the precision grinding method and the cold treatment method are adopted, particularly the precision grinding clamp of the bearing seat is used, the precision grinding of the inner circle, the outer circle and the end face of the part is finished by one-time clamping, the manufacturing precision requirement and the use stability requirement of the precision bearing seat are met, the high-efficiency processing of the precision part can be realized, the production efficiency is improved, and the rejection rate of the product is greatly reduced; due to the adoption of cold treatment, the size stability is good, the part is not easy to deform in the using process, and the service life of the part can be greatly prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of a bearing housing;
FIG. 2 is a schematic view of the structure of the jig;
FIG. 3 is a schematic structural view of the expansion sleeve;
FIG. 4 is a schematic structural view of a transition ring with locating pins;
FIG. 5 is a schematic view of the structure of the bearing housing for finish grinding of the outer circumference and the end face of the outer circumference;
figure 6 is a schematic view of the arrangement for refining the end faces of the inner bore and the inner bore of the bearing block.
The reference numbers in the figures are: 1. a clamp body; 2. a first screw; 3. a mandrel; 4. expanding sleeves; 5. positioning pins; 6. a positioning sleeve; 7. a third screw; 8. tightening the screw; 9. a hook-shaped pressing plate; 10. a gasket; 11. positioning pins; 12. and (4) a transition ring.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
A machining method of a precision bearing seat comprises the following steps:
step 1) material preparation: the blank is a forging forged piece forged by a precision die;
step 2) rough turning: clamping the forge piece by using a three-jaw chuck hard jaw on a common numerical control lathe, roughly turning the end surface of the excircle and the excircle of the forge piece, turning the forge piece around, clamping the forge piece by using the three-jaw chuck hard jaw, roughly turning the end surface and the excircle of the other excircle of the forge piece, and roughly boring the inner hole and the end surface of the inner hole of the forge piece; reserving a finish machining allowance of 2-2.5 mm on the excircle of the workpiece, and reserving a finish machining allowance of 1-1.5 mm on the excircle end face of the workpiece;
step 3) heat treatment: annealing the roughly turned workpiece;
step 4), finish turning: clamping the heat-treated workpiece by using a three-jaw chuck hard jaw on a precise numerical control lathe, and finely turning the excircle, the cutting groove and the excircle end face of the workpiece; then clamping by using a three-jaw chuck soft jaw, finely turning the other excircle end face of the workpiece, and finely boring an inner hole and an inner hole end face; reserving a fine grinding allowance of 0.2-0.4 mm for the excircle of the workpiece, and reserving a fine grinding allowance of 0.05-0.1 mm for the end face of the excircle of the workpiece;
step 5) cold treatment: performing cold treatment on the workpiece after finish turning;
step 6), fine grinding: the cold-treated workpiece is clamped by the bearing seat precision grinding clamp at one time, the inner hole, the outer circle and the end face of the workpiece are ground on the precision universal numerical control grinding machine, the bearing seat is machined, the production efficiency is high, and the form and position tolerance precision can be controlled within 0.001 mm.
See fig. 1 ~ 6, the bearing frame has the seal groove of processing in advance on being close to the excircle of rear end, and the rear end of bearing frame still has inside protruding circle, bearing frame grinds anchor clamps and has once the anchor clamps body 1 of clamping on universal numerical control precision grinding machine three-jaw chuck, install dabber 3 in the locating hole at 1 front end middle part of the anchor clamps body, wear to be equipped with first screw 2 in the locating hole at 3 rear end middle parts of dabber, the screw thread portion of first screw 2 and the screw hole threaded connection at 1 rear end middle part of the anchor clamps body, install dabber 3 through first screw 2 in the locating hole of the anchor clamps body 1 promptly. An expansion sleeve 4 for positioning and clamping a workpiece is sleeved on the outer circle of the mandrel 3, and the outer wall of the expansion sleeve 4 is in contact with the inner wall of a convex ring on the workpiece. A positioning sleeve 6 is arranged between the front end boss of the fixture body 1 and the rear end face of the workpiece through a second screw, and the inner wall of a positioning hole in the middle of the positioning sleeve 6 is in contact with the outer wall of the expansion sleeve 4; a hook-shaped pressing plate 9 which is convenient for a universal numerical control precision grinding machine to finely grind the inner hole and the end surface of the inner hole of the workpiece is arranged on the positioning sleeve 6 through a set screw 8, and the front end of the hook-shaped pressing plate 9 hooks a sealing groove of the workpiece; the clamp is further provided with a gasket 10 installed in an inner hole of a workpiece, the rear end face of the gasket 10 is in contact with the front end face of a convex ring of the workpiece, a third screw 7 penetrates through a middle positioning hole of the gasket 10, a threaded portion of the third screw 7 is in threaded connection with a threaded hole in the middle of the front end of the mandrel 3, and the gasket 10 which is convenient for the universal numerical control precision grinding machine to accurately grind the outer circle and the outer circle end face of the workpiece is installed in the inner hole of the workpiece through the third screw 7. The clearance between the expansion sleeve 4 and the workpiece is 0.02-0.03 mm.
The expansion sleeve 4 is a rotary sleeve part with an inner hole provided with a double conical surface, the outer surface of the expansion sleeve 4 is provided with a plurality of equally-divided and staggered non-through narrow grooves, the expansion sleeve 4 is used for positioning and clamping the sleeve part, and the two end faces of the expansion sleeve are provided with a plurality of equally-divided positioning holes, so that the expansion sleeve 4 can be polished in time when being deformed in the use process, and the positioning precision of the clamp is ensured. The mandrel 3 is a rotating shaft part with a double conical surface and a guiding function, the expansion sleeve 4 and the mandrel 3 are connected together through a stop pin, and the phenomenon that the expansion sleeve 4 rotates when the clamp is used, so that the matching surface of the clamp is partially roughened and the precision of the clamp is finally influenced is prevented. The fixture body 1 is a rotary shaft part with a positioning hole and is used for axially positioning the mandrel 3. The hook-shaped press plate 9 is fan-shaped. The positioning sleeve 6 is a rotary sleeve type part and is used for axial positioning during grinding of the sleeve type part.
The use method of the precision grinding clamp comprises the steps that firstly, a first screw 2 is screwed, a mandrel 3 axially moves along a positioning hole of a clamp body 1, an expansion sleeve 4 is driven to axially move along the positioning hole of the clamp body 1, the outer circle of the expansion sleeve 4 gradually becomes large, the outer wall of the expansion sleeve 4 is in closer contact with the rear end of the inner wall of the positioning hole in the middle of a workpiece, and the expansion sleeve 4 is positioned and clamped with the workpiece; then the third screw 7 is screwed, the contact between the rear end face of the gasket 10 and the side wall of the inner hole at the front end of the positioning hole in the middle of the workpiece is tighter, and the gasket 10 and the third screw 7 further clamp the workpiece; then, accurately grinding the outer circle and the end face of the outer circle of the workpiece by using a precision universal numerical control grinding machine; further screwing the set screw 8 to clamp the workpiece by the positioning sleeve 6, the hook-shaped pressing plate 9 and the set screw 8, loosening the third screw 7 and removing the gasket 10; and then, carrying out fine grinding on the inner hole and the end face of the inner hole of the workpiece by using a precision universal numerical control grinding machine.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A machining method of a precision bearing seat is characterized by comprising the following steps: the method comprises the following steps: step 1) material preparation: the blank is a forging forged piece forged by a precision die; step 2) rough turning: clamping the forge piece by using a three-jaw chuck hard jaw on a common numerical control lathe, roughly turning the end surface of the excircle and the excircle of the forge piece, turning the forge piece around, clamping the forge piece by using the three-jaw chuck hard jaw, roughly turning the end surface and the excircle of the other excircle of the forge piece, and roughly boring the inner hole and the end surface of the inner hole of the forge piece; step 3) heat treatment: annealing the roughly turned workpiece; step 4), finish turning: clamping the heat-treated workpiece by using a three-jaw chuck hard jaw on a precise numerical control lathe, and finely turning the excircle, the cutting groove and the excircle end face of the workpiece; then clamping by using a three-jaw chuck soft jaw, finely turning the other excircle end face of the workpiece, and finely boring an inner hole and an inner hole end face; step 5) cold treatment: performing cold treatment on the workpiece after finish turning; step 6), fine grinding: and clamping the cold-treated workpiece by using the precision grinding clamp of the bearing seat at one time, and finishing grinding the inner hole, the outer circle and the end face of the workpiece on a precision universal numerical control grinding machine to finish machining the bearing seat.
2. The method for machining the precision bearing seat as claimed in claim 1, wherein the method comprises the following steps: in the step 2, a finish machining allowance of 2-2.5 mm is reserved on the excircle of the workpiece, and a finish machining allowance of 1-1.5 mm is reserved on the excircle end face of the workpiece.
3. The method for machining the precision bearing seat as claimed in claim 1, wherein the method comprises the following steps: in the step 4, a fine grinding allowance of 0.2-0.4 mm is reserved on the excircle of the workpiece, and a fine grinding allowance of 0.05-0.1 mm is reserved on the end face of the excircle of the workpiece.
4. The method for machining the precision bearing seat as claimed in claim 1, wherein the method comprises the following steps: in the step 6, the bearing seat precision grinding clamp is provided with a clamp body (1) which is clamped on a three-jaw chuck of the universal numerical control precision grinding machine at one time, a mandrel (3) is arranged in a positioning hole of the clamp body (1) through a first screw (2), an expansion sleeve (4) which is used for positioning and clamping a workpiece is sleeved on the excircle of the mandrel (3), a positioning sleeve (6) is arranged between the clamp body (1) and the workpiece through a second screw, and a hook-shaped pressing plate (9) which is convenient for the universal numerical control precision grinding machine to finely grind the inner hole and the end face of the inner hole of the workpiece is arranged on the positioning sleeve (6) through a set screw (8); the clamp is also provided with a gasket (10) which is arranged in an inner hole of the workpiece through a third screw (7) and is convenient for the universal numerical control precision grinding machine to carry out fine grinding on the outer circle and the end surface of the outer circle of the workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034707.3A CN111515616A (en) | 2019-10-29 | 2019-10-29 | Machining method of precision bearing seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034707.3A CN111515616A (en) | 2019-10-29 | 2019-10-29 | Machining method of precision bearing seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111515616A true CN111515616A (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911034707.3A Withdrawn CN111515616A (en) | 2019-10-29 | 2019-10-29 | Machining method of precision bearing seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111515616A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112958791A (en) * | 2021-03-24 | 2021-06-15 | 力源液压（苏州）有限公司 | Cylinder body spherical surface machining process and clamp |
| CN114589464A (en) * | 2022-03-15 | 2022-06-07 | 江南工业集团有限公司 | Method for machining inner hole of high-precision long and thin cylindrical part |
| CN115365770A (en) * | 2022-09-19 | 2022-11-22 | 中船华南船舶机械有限公司 | Method for processing connecting rod head |
| CN116765767A (en) * | 2023-08-22 | 2023-09-19 | 潍坊富源增压器有限公司 | Processing method of thrust sleeve for supercharger |
| CN116787167A (en) * | 2023-08-03 | 2023-09-22 | 苏州华丰不锈钢紧固件有限公司 | Nut gasket processing equipment |
-
2019
- 2019-10-29 CN CN201911034707.3A patent/CN111515616A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112958791A (en) * | 2021-03-24 | 2021-06-15 | 力源液压（苏州）有限公司 | Cylinder body spherical surface machining process and clamp |
| CN114589464A (en) * | 2022-03-15 | 2022-06-07 | 江南工业集团有限公司 | Method for machining inner hole of high-precision long and thin cylindrical part |
| CN115365770A (en) * | 2022-09-19 | 2022-11-22 | 中船华南船舶机械有限公司 | Method for processing connecting rod head |
| CN116787167A (en) * | 2023-08-03 | 2023-09-22 | 苏州华丰不锈钢紧固件有限公司 | Nut gasket processing equipment |
| CN116787167B (en) * | 2023-08-03 | 2023-10-27 | 苏州华丰不锈钢紧固件有限公司 | Nut gasket processing equipment |
| CN116765767A (en) * | 2023-08-22 | 2023-09-19 | 潍坊富源增压器有限公司 | Processing method of thrust sleeve for supercharger |
| CN116765767B (en) * | 2023-08-22 | 2023-10-31 | 潍坊富源增压器有限公司 | Processing method of thrust sleeve for supercharger |
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Application publication date: 20200811 |