CN110539170A - Machining method of high-precision hollow sleeve - Google Patents
Machining method of high-precision hollow sleeve Download PDFInfo
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- CN110539170A CN110539170A CN201910716891.3A CN201910716891A CN110539170A CN 110539170 A CN110539170 A CN 110539170A CN 201910716891 A CN201910716891 A CN 201910716891A CN 110539170 A CN110539170 A CN 110539170A
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- hollow sleeve
- processing
- bearing hole
- precision
- outer diameter
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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
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/02—Machine tools for performing different machining operations
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses a processing method of a high-precision hollow sleeve, which is implemented according to the following steps: step 1: processing a bearing hole of the hollow sleeve, wherein the diameter allowance of the bearing hole is 3mm +/-0.02; step 2: installing a standard center plug on the bearing hole formed in the step 1, and processing the outer diameter of the hollow sleeve to meet the precision requirement; and step 3: and processing the bearing hole of the hollow sleeve by taking the outer diameter of the hollow sleeve as a reference to meet the precision requirement. The invention eliminates the accumulated error caused by the reference conversion of the central hole through the conversion of the processing reference. Because the same reference is adopted, the final circular run-out of the hollow sleeve is improved, the high-efficiency and high-precision processing of the hollow sleeve is realized, the waste loss is reduced, the repair of parts is reduced, the production period is shortened, and the production cost is saved.
Description
Technical Field
The invention belongs to the technical field of roller processing, and relates to a processing method of a high-precision hollow sleeve.
Background
The hollow roller belongs to a thin-wall sleeve part and mainly comprises a hollow sleeve and a main shaft. As shown in fig. 1, both ends of the hollow sleeve are provided with bearing holes. During the processing, a standard central plug is needed. The standard center plug is one of tools which are frequently used for machining shaft parts and sleeve parts and are used for positioning and machining workpieces by using a center hole, a matrix of the standard center plug is generally made of a steel part and is subjected to quenching and tempering, the hole and the outer diameter are machined, then a plug core is arranged in the center of the matrix, the plug core is generally made of alloy steel materials and is subjected to quenching treatment to increase the hardness and the wear resistance, a standard center hole (such as 60 degrees, 75 degrees, 90 degrees and the like which are commonly used) is formed in the plug core, the coaxiality requirement of the center hole and the plug core is high, the plug core and the standard center plug inner hole are arranged in an interference fit mode, and finally the outer diameter of the center hole and the standard center plug also requires high concentricity, and the standard center. When a lathe and a grinding machine are used for processing shaft parts or sleeve parts, the standard center is plugged into an inner hole (single side or double sides) on the end face of the part, and then a tailstock (or a main shaft) tip of the machine tool is used for tightly pushing a workpiece, so that the workpiece is processed.
In the conventional processing method, the center line of the hollow sleeve is used as a reference for processing, i.e., a standard center plug is arranged in bearing holes at two ends of the hollow sleeve, as shown in fig. 2. Bearing holes at two ends of the hollow sleeve are used as a reference. During processing, firstly, bearing holes at two ends of the hollow sleeve are processed to the drawing size at one time according to the drawing, then standard center plugs are installed at two ends of the hollow sleeve, the hollow sleeve is clamped by the double-tip mounting, and the outer diameter of the hollow sleeve is turned and ground to meet the drawing size precision requirement of the hollow sleeve.
In the processing method, because the standard central plug has errors of concentricity, verticality and the like of the outer diameter and the central hole of the plug core, and the standard central plug is repeatedly used for a long time, the central hole, the outer diameter of the central plug and the end surface can generate inevitable comprehensive errors. Meanwhile, due to the fact that machining of a lathe and a grinding machine is conducted on dead centers and live centers, jumping errors of the outer diameters of the bearing holes and the hollow sleeve are high, the inner hole is inconsistent with the outer diameter standard, cylindricity, concentricity and circular jumping are all 0.1-0.5 when the roller rotates, various errors of the bearing holes in the two sides of the hollow sleeve and the outer diameters of the bearing holes are caused, and a large number of hollow rollers are scrapped or repaired.
Disclosure of Invention
The invention aims to provide a high-precision hollow roller processing method, which solves the problems of large processing error and low precision of a hollow sleeve in the prior art.
The technical scheme adopted by the invention is that the processing method of the high-precision hollow sleeve is implemented according to the following steps:
Step 1: processing a hollow sleeve to form a bearing hole, wherein the diameter allowance of the bearing hole is 3mm +/-0.02;
Step 2: installing a standard center plug on the bearing hole formed in the step 1, and processing the outer diameter of the hollow sleeve to meet the precision requirement;
and step 3: and processing the bearing hole of the hollow sleeve by taking the outer diameter of the hollow sleeve as a reference to meet the precision requirement.
The invention is also characterized in that:
The diameter of the bearing hole in the step 1 is an integral value.
And 2, turning and grinding the outer diameter of the hollow sleeve in the step 2.
and 3, clamping the hollow sleeve by the central frame.
the center frame is of a circular ring structure, a plurality of supporting pieces which can extend to the center of the circular ring are fixedly connected to the inner wall of the center frame, and the length of the supporting pieces is the same.
there are 3 supporting members.
The supporting pieces are uniformly arranged.
The method has the advantages of realizing high-efficiency and high-precision processing of the hollow sleeve, reducing waste loss and part repair, shortening production period, saving production cost, along with simple implementation and popularization value.
Drawings
FIG. 1 is a schematic structural view of a hollow sleeve;
FIG. 2 is a schematic view of the installation of a standard center plug;
FIG. 3 is a flow chart of a method of manufacturing a high precision hollow sleeve according to the present invention;
FIG. 4 is a schematic view of the mounting of the steady rest;
Fig. 5 is a schematic structural view of the center frame.
In the figure, 1 is a hollow sleeve, 2 is a bearing hole, 3 is a standard center plug, 4 is a center frame, and 5 is a supporting piece.
Detailed Description
the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a processing method of a high-precision hollow sleeve, which is implemented according to the following steps as shown in figure 3:
Step 1: processing a bearing hole 2 of the hollow sleeve 1, wherein the diameter of the bearing hole 2 is reserved by 3mm +/-0.02 according to the requirement of the drawing size, and the diameter of the bearing hole 2 is an integer;
Step 2: installing a standard center plug 3 on the bearing hole 2 formed in the step 1, turning and grinding the outer diameter of the hollow sleeve 1 to meet the precision requirement, wherein the two ends of the hollow sleeve 1 are not machined to the size of the bearing hole with the size of the drawing, and the error of the original method still exists between the two ends of the hollow sleeve 1 and the hollow sleeve;
And step 3: as shown in fig. 4, the hollow sleeve 1 obtained in step 2 is mounted on a lathe, and the bearing holes 2 of the hollow sleeve 1 are respectively turned around and machined by clamping the hollow sleeve 1 through a center frame 4 by taking the outer diameter of the hollow sleeve 1 as a reference, so as to meet the precision requirement.
the diameter of the bearing hole 1 in the step 1 is an integer value, so that a proper standard central plug can be conveniently selected subsequently.
The center frame is one of the most main accessories of the lathe and is an indispensable device for turning slender shafts. The center frame is generally made of castings, an upper box body and a lower box body of the center frame are integrally cast, a center frame main body is fastened on a bed surface through a pressing plate and a nut, an upper cover and the main body are movably connected through a pin, the upper cover can be opened or buckled and fixed through the nut in order to facilitate loading and unloading of workpieces, and the lifting of a supporting claw is adjusted through a screw so as to adapt to workpieces with different diameters. During turning, lubricating oil is added at the contact part of the supporting claw of the center frame and the workpiece to ensure good contact between the supporting piece and the workpiece, and a layer of abrasive cloth, a belt or an abrasive agent can be added between the center frame and the workpiece to grind and cohere. The center frame mainly has the functions of supporting, fixing and strengthening rigidity during turning of slender shaft parts and reducing vibration and bending deformation of workpieces during turning. In general, when the workpiece can be turned in a segmented mode, the center frame is supported in the middle of the workpiece, so that the L/d value is reduced by half, the rigidity of the workpiece is increased by several times, and the turning efficiency and the part precision are improved.
as shown in fig. 5, the center frame 4 adopted in the present invention is a circular ring structure, and 3 supporting members 5 extending to the center of the circular ring are fixedly connected to the inner wall of the center frame, the length of the supporting members 5 is the same, and the supporting members 5 are uniformly arranged at 120 degrees. The center frame can be placed at the end part of a part to support the part and ensure that the rotation precision is almost completely consistent with that of a supporting part when an inner hole or other excircle parts are turned because the excircle of the part is in direct contact with a supporting part when the part is rotated.
The size of the bearing hole 2 at the two ends of the hollow sleeve 1 obtained in the step 1 does not meet the requirement of the drawing size, and the size of the bearing hole 2 of the hollow sleeve 1 can meet the requirement of the drawing precision through the processing process taking the outer diameter of the hollow sleeve 1 as the reference in the step 3.
In order to further clarify the technical effect of the invention relative to the existing processing method, 6 hollow sleeves with the same specification are respectively processed, and the concentricity, circular run-out and cylindricity of the sleeves are measured by using tools such as a manual micrometer.
The three hollow sleeves 1#, 2#, and 3# are processed by the existing processing method, namely, firstly, the bearing holes 2 at two ends of the hollow sleeve 1 are processed to the drawing size at one time according to the drawing, then, the standard central plugs 3 are arranged at two ends of the hollow sleeve 1, the hollow sleeve 1 is clamped by the double-top points, and the outer diameter of the hollow sleeve 1 is turned and ground to meet the drawing size precision requirement.
The three hollow sleeves 4#, 5#, and 6# are processed by the processing method, namely, the bearing hole 2 of the hollow sleeve 1 is processed firstly, and the diameter allowance of the bearing hole 2 is 3mm +/-0.02; then, a standard central plug 3 is installed on the bearing hole 2 formed in the step 1, and the outer diameter of the processed hollow sleeve 1 meets the precision requirement; and finally, processing the bearing hole 2 of the hollow sleeve 1 by taking the outer diameter of the hollow sleeve 1 as a reference to meet the precision requirement.
the 6 hollow sleeves were then tested for concentricity, circular run out, and cylindricity, with the results shown in table 1.
Test result comparison table of hollow sleeve by different processing methods
TABLE 1
It can be seen that the concentricity of the outer diameter of the hollow sleeve machined by the existing machining method and the bearing hole is 0.1-0.2, and the concentricity of the outer diameter of the hollow sleeve machined by the invention and the bearing hole is 0.005-0.01. The hollow sleeve processed by the existing processing method has the outer circle run-out of 0.16-0.3, and the hollow sleeve processed by the invention has the outer circle run-out of 0.015-0.02. The outer diameter cylindricity of the hollow sleeve processed by the existing processing method is 0.18-0.5, and the outer diameter cylindricity of the hollow sleeve processed by the invention is 0.015-0.03. Therefore, the processing precision is greatly improved and the error is reduced by the invention.
The processing standard of the invention is converted from the center line of the hollow sleeve to the outer diameter, thereby ensuring the consistency of the processing standard. In fact, the jumping value of the outer diameter of the hollow sleeve is the jumping value of the bearing hole, the jumping value depends on the system precision of a machine tool, and the common machine tool is guaranteed to be 0.015 mm.
the invention eliminates the accumulated error caused by the reference conversion of the central hole through the conversion of the processing reference. Because the same reference is adopted, the final circular run-out of the hollow sleeve is improved, the high-efficiency and high-precision processing of the hollow sleeve is realized, the waste loss is reduced, the repair of parts is reduced, the production period is shortened, and the production cost is saved.
Claims (7)
1. A processing method of a high-precision hollow sleeve is characterized by comprising the following steps:
Step 1: processing a hollow sleeve (1) and opening the hollow sleeve into a bearing hole (2), wherein the diameter allowance of the bearing hole (2) is 3mm +/-0.02;
Step 2: installing a standard central plug (3) on the bearing hole (2) formed in the step (1), and processing the outer diameter of the hollow sleeve (1) to meet the precision requirement;
and step 3: the outer diameter of the hollow sleeve (1) is used as a reference, and the bearing hole (2) on the hollow sleeve (1) is machined to meet the precision requirement.
2. A method for processing a hollow sleeve with high precision as claimed in claim 1, wherein the diameter of the bearing hole (2) in step 1 is integer value.
3. the method for processing the hollow sleeve with high precision as claimed in claim 1, wherein the processing mode of the outer diameter of the hollow sleeve (1) in the step 2 is turning and grinding.
4. A high-precision hollow sleeve processing method as claimed in claim 1, wherein the hollow sleeve (1) is clamped by a central frame (4) in the step 3.
5. a method for manufacturing a hollow sleeve with high precision according to claim 4, characterized in that the center frame (4) is a circular ring structure, a plurality of supporting members (4) which can extend to the center of the circular ring are fixed on the inner wall of the center frame, and the lengths of the supporting members (5) are the same.
6. A method for manufacturing a hollow sleeve with high precision according to claim 5, characterized in that the supporting elements (5) are arranged evenly.
7. A method for manufacturing a hollow sleeve with high precision according to claim 5, characterized in that there are 3 supporting members (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716891.3A CN110539170A (en) | 2019-08-05 | 2019-08-05 | Machining method of high-precision hollow sleeve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716891.3A CN110539170A (en) | 2019-08-05 | 2019-08-05 | Machining method of high-precision hollow sleeve |
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| CN110539170A true CN110539170A (en) | 2019-12-06 |
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| CN201910716891.3A Pending CN110539170A (en) | 2019-08-05 | 2019-08-05 | Machining method of high-precision hollow sleeve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872635A (en) * | 2020-07-21 | 2020-11-03 | 无锡市润和机械有限公司 | Ultra-length-diameter-ratio turbine shaft with blind holes and accurate butt joint processing method |
| CN112792502A (en) * | 2020-12-18 | 2021-05-14 | 一重集团天津重工有限公司 | Fine processing method for upper beam of multi-connecting-rod press |
| CN115106357A (en) * | 2022-06-21 | 2022-09-27 | 首钢智新迁安电磁材料有限公司 | Method for prolonging service life of thick-wall sleeve of rolling mill |
Citations (6)
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|---|---|---|---|---|
| FR2476518A1 (en) * | 1980-02-27 | 1981-08-28 | Gfm Gmbh | PROCESS FOR MILLING CRANKSHAFTS OR CAMSHAFTS |
| CN202921945U (en) * | 2012-10-18 | 2013-05-08 | 无锡银联机械有限公司 | Sector clamping claw device for processing thin-walled workpiece |
| CN104924137A (en) * | 2015-07-13 | 2015-09-23 | 株洲齿轮有限责任公司 | Clamp assembly for finish machining of thin-wall ring columnar part and machining method |
| CN105328409A (en) * | 2015-10-28 | 2016-02-17 | 湖北三江航天红阳机电有限公司 | Method for machining thin-wall sleeve type part through wedge type inner supporting mechanism |
| CN207189185U (en) * | 2017-08-29 | 2018-04-06 | 长沙精达印刷制版有限公司 | A kind of lathe center frame |
| CN208019794U (en) * | 2018-03-30 | 2018-10-30 | 荆州大方智能科技股份有限公司 | A kind of steady for machine tool |
-
2019
- 2019-08-05 CN CN201910716891.3A patent/CN110539170A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2476518A1 (en) * | 1980-02-27 | 1981-08-28 | Gfm Gmbh | PROCESS FOR MILLING CRANKSHAFTS OR CAMSHAFTS |
| CN202921945U (en) * | 2012-10-18 | 2013-05-08 | 无锡银联机械有限公司 | Sector clamping claw device for processing thin-walled workpiece |
| CN104924137A (en) * | 2015-07-13 | 2015-09-23 | 株洲齿轮有限责任公司 | Clamp assembly for finish machining of thin-wall ring columnar part and machining method |
| CN105328409A (en) * | 2015-10-28 | 2016-02-17 | 湖北三江航天红阳机电有限公司 | Method for machining thin-wall sleeve type part through wedge type inner supporting mechanism |
| CN207189185U (en) * | 2017-08-29 | 2018-04-06 | 长沙精达印刷制版有限公司 | A kind of lathe center frame |
| CN208019794U (en) * | 2018-03-30 | 2018-10-30 | 荆州大方智能科技股份有限公司 | A kind of steady for machine tool |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111872635A (en) * | 2020-07-21 | 2020-11-03 | 无锡市润和机械有限公司 | Ultra-length-diameter-ratio turbine shaft with blind holes and accurate butt joint processing method |
| CN111872635B (en) * | 2020-07-21 | 2021-04-13 | 无锡市润和机械有限公司 | Ultra-length-diameter-ratio turbine shaft with blind holes and accurate butt joint processing method |
| CN112792502A (en) * | 2020-12-18 | 2021-05-14 | 一重集团天津重工有限公司 | Fine processing method for upper beam of multi-connecting-rod press |
| CN115106357A (en) * | 2022-06-21 | 2022-09-27 | 首钢智新迁安电磁材料有限公司 | Method for prolonging service life of thick-wall sleeve of rolling mill |
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Application publication date: 20191206 |