CN113751964A - Multi-step inner hole machining method - Google Patents
Multi-step inner hole machining method Download PDFInfo
- Publication number
- CN113751964A CN113751964A CN202110937436.3A CN202110937436A CN113751964A CN 113751964 A CN113751964 A CN 113751964A CN 202110937436 A CN202110937436 A CN 202110937436A CN 113751964 A CN113751964 A CN 113751964A
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- China
- Prior art keywords
- reamer head
- inner hole
- reamer
- step inner
- head
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- 238000003754 machining Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005498 polishing Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000011882 ultra-fine particle Substances 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention provides a multi-step inner hole machining method. The machining method comprises the steps of designing a cutter according to the structure of a multi-step inner hole to be machined, carrying out a process test, machining a workpiece blank, roughly reaming, semi-finely reaming, finely reaming and the like. The machining method has the advantages of high machining efficiency, high coaxial precision of the stepped holes, avoidance of tool receiving marks caused by repeated tool changing, improvement of valve control surface quality and high yield; polishing, cleaning and rust prevention processes are added; the problems of high precision, unstable multi-step inner hole machining size, low form and position tolerance and low roughness and difficulty in meeting the requirements of product drawings are solved; the method can be widely applied to the machining of precision valve holes of AT gearbox valve bodies, front supports and other parts.
Description
Technical Field
The invention relates to the technical field of gearboxes, in particular to a multi-step inner hole machining method.
Background
A plurality of multi-step inner hole structures are arranged on the AT gearbox valve body and the front support. The quality requirements of each hole are very strict, such as accuracy grade 6, roughness Ra0.4, cylindricity 0.003, axiality 0.005 and the like. However, the machining precision of the multi-step inner hole structure is not guaranteed, and the consistency of finished products is poor: in the existing machining and forming process, each hole is independently machined, the coaxiality is difficult to guarantee, and a plurality of cutters in different forms need to be replaced usually. Meanwhile, due to the existence of steps and faults, the hole roughness and the cylindricity are difficult to guarantee.
Therefore, the multi-step inner hole machining method is developed, and has great significance for machining precision valve holes of AT gearbox valve bodies, front supports and other parts.
Disclosure of Invention
The invention aims to provide a multi-step inner hole machining method to solve the problems in the prior art.
The technical scheme adopted for achieving the purpose of the invention is that the multi-step inner hole machining method comprises the following steps:
1) and designing a cutter according to the structure of the inner hole of the multi-step to be processed. Wherein, the cutter comprises a clamping rod and a reamer rod. And the cutter is provided with a through cooling hole along the length direction. The reamer rod comprises a first reamer head, a second reamer head, a third reamer head and a fourth reamer head which are coaxially arranged in sequence along the direction far away from the clamping rod. The first reamer head, the second reamer head, the third reamer head and the fourth reamer head are integrally cylinders with diameters decreasing in sequence. And cutting edges distributed in unequal teeth are arranged on the outer walls of the first reamer head, the second reamer head, the third reamer head and the fourth reamer head. The fourth reamer head is provided with a countersink along the axis direction. The counterbore includes a tapered expansion cavity and a threaded cavity. The part of the outer wall of the fourth reamer head, which corresponds to the conical expansion cavity, is provided with an expansion notch for axially cutting the conical expansion cavity. The countersunk head bolt is screwed in the countersunk head hole. The nut of the countersunk head bolt is abutted against the inner wall of the expansion cavity.
2) And (5) carrying out a process test, and determining the rotating speed S and the feeding quantity F of the cutter.
3) And processing the end face of the workpiece blank, and pre-drilling a multi-step inner hole on the workpiece.
4) And taking the minimum aperture section on the multi-step inner hole as a reference, and roughly hinging the whole multi-step inner hole at one time by using the matched reamer heads.
5) And (4) semi-finish reaming is carried out to each bore section of the multi-step inner bore until a set machining allowance is reserved from the required size.
6) And (4) finely reaming each bore section of the multi-step inner bore until the quality requirement is met.
Further, the outer wall of the clamping rod is a smooth surface. The outer wall of the reamer rod is covered with super-hard abrasive. The first reamer head, the second reamer head, the third reamer head and the fourth reamer head are different in granularity.
Further, the mesh number of the cutting edges of the first reamer head, the second reamer head, the third reamer head and the fourth reamer head is different.
Further, the reamer rod is made of ultrafine particle hard alloy materials.
Furthermore, the clamping rod is a Moire type tail handle or a straight handle tail handle.
Furthermore, a liquid outlet hole is also formed in the rod body of the reamer rod. The liquid outlet hole is communicated with the cooling hole and the outer part of the reamer rod.
Further, the rotating speed in the step 4) is more than or equal to 1200 and less than or equal to 1500n/min, and the feeding amount is 0.1 mm/n.
Further, in the step 5), the diameter of the inner hole of the multiple steps is left with a margin of 0.06-0.12 mm.
Further, step 6) is followed by the associated steps of polishing, cleaning and rust prevention.
The technical effects of the invention are undoubted: the machining efficiency is high, the coaxial precision of the step holes is high, tool connecting marks of multiple tool changing are avoided, the valve control surface quality is improved, and the yield is high; polishing, cleaning and rust prevention processes are added; the problems of high precision, unstable multi-step inner hole machining size, low form and position tolerance and low roughness and difficulty in meeting the requirements of product drawings are solved; the method can be widely applied to the machining of precision valve holes of AT gearbox valve bodies, front supports and other parts.
Drawings
FIG. 1 is a schematic view of a cutter structure;
FIG. 2 is a schematic view of a cutting edge;
FIG. 3 is a schematic view of the operation of the tool;
fig. 4 is a schematic view of a multi-step bore.
In the figure: the multi-step drilling machine comprises a clamping rod 1, a reamer rod 2, a first reamer head 201, a second reamer head 202, a third reamer head 203, a fourth reamer head 204, a counter bore 2041, a cutting edge 205, a cooling hole 3, a multi-step inner hole 4 and a workpiece blank 5.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment provides a multi-step inner hole machining method, which comprises the following steps:
1) and designing a cutter according to the structure of the multi-step inner hole 4 to be processed. Wherein, the cutter comprises a clamping rod 1 and a reamer rod 2. The cutter is provided with a through cooling hole 3 along the length direction. The body of the reamer rod 2 is also provided with a liquid outlet 206. The liquid outlet 206 communicates with the cooling hole 3 and the outside of the reamer shank 2. The reamer bar 2 comprises a first reamer head 201, a second reamer head 202, a third reamer head 203 and a fourth reamer head 204 which are coaxially arranged in sequence along the direction far away from the clamping bar 1. The first reamer head 201, the second reamer head 202, the third reamer head 203 and the fourth reamer head 204 are integrally cylindrical bodies with diameters decreasing in sequence. The outer walls of the first reamer head 201, the second reamer head 202, the third reamer head 203 and the fourth reamer head 204 are provided with cutting edges 205 with unequal tooth distribution. The cutting edges 205 of the first, second, third and fourth reamer heads 201, 202, 203 and 204 have different numbers of meshes. The outer wall of the clamping rod 1 is a smooth surface. The reamer rod 2 is made of ultrafine particle hard alloy materials. The first 201, second 202, third 203 and fourth 204 reamer heads differ in granularity. The fourth reamer head 204 is countersunk 2041 along the axial direction. The counter bore 2041 includes a tapered expansion cavity and a threaded cavity. The portion of the outer wall of the fourth reamer head 204 corresponding to the conical expansion cavity has an expansion notch cutting it axially. The countersunk bolt is screwed into the countersunk hole 2041. The nut of the countersunk head bolt is abutted against the inner wall of the expansion cavity.
2) And (5) carrying out a process test, and determining the rotating speed S and the feeding quantity F of the cutter.
3) And (3) processing the end face of the workpiece blank 5, and pre-drilling the multi-step inner hole 4 on the workpiece.
4) And roughly reaming the whole multi-step inner hole 4 by using a matched reaming head with reference to the minimum aperture section on the multi-step inner hole 4.
5) And (3) semi-finish reaming is carried out to each aperture section of the multi-step inner hole 4 until a set machining allowance is reserved from the required size.
6) And (4) finishing and reaming each bore section of the multi-step inner bore 4 until the quality requirement is met.
7) And polishing, cleaning and rust-proof treatment are carried out on the multi-step inner hole 4.
The embodiment utilizes the cutter with an innovative structure, adopts verified cutting parameters for processing, and solves the problems of unstable processing size, low form and position tolerance and roughness and difficulty in meeting the requirements of product drawings of high-precision and multi-step inner hole processing through rough reaming, semi-finish reaming, polishing, cleaning and rust-proof treatment. The embodiment can be widely applied to the machining of precision valve holes of AT gearbox valve bodies, front supports and other parts. This embodiment simultaneously customizes instrument such as special step hole removes reaming, burring, polishing, increases polishing, washing, rust-resistant process, has solved high accuracy, the requirement that the multi-step hole precision can not satisfy the drawing.
Example 2:
the embodiment provides a basic multi-step inner hole machining method, which comprises the following steps:
1) and designing a cutter according to the structure of the multi-step inner hole 4 to be processed. Wherein, the cutter comprises a clamping rod 1 and a reamer rod 2. The cutter is provided with a through cooling hole 3 along the length direction. The reamer bar 2 comprises a first reamer head 201, a second reamer head 202, a third reamer head 203 and a fourth reamer head 204 which are coaxially arranged in sequence along the direction far away from the clamping bar 1. The first reamer head 201, the second reamer head 202, the third reamer head 203 and the fourth reamer head 204 are integrally cylindrical bodies with diameters decreasing in sequence. The outer walls of the first reamer head 201, the second reamer head 202, the third reamer head 203 and the fourth reamer head 204 are provided with cutting edges 205 with unequal tooth distribution. The fourth reamer head 204 is countersunk 2041 along the axial direction. The counter bore 2041 includes a tapered expansion cavity and a threaded cavity. The portion of the outer wall of the fourth reamer head 204 corresponding to the conical expansion cavity has an expansion notch cutting it axially. The countersunk bolt is screwed into the countersunk hole 2041. The nut of the countersunk head bolt is abutted against the inner wall of the expansion cavity.
2) And (5) carrying out a process test, and determining the rotating speed S and the feeding quantity F of the cutter.
3) And (3) processing the end face of the workpiece blank 5, and pre-drilling the multi-step inner hole 4 on the workpiece.
4) And roughly reaming the whole multi-step inner hole 4 by using a matched reaming head with reference to the minimum aperture section on the multi-step inner hole 4.
5) And (3) semi-finish reaming is carried out to each aperture section of the multi-step inner hole 4 until a set machining allowance is reserved from the required size.
6) And (4) finishing and reaming each bore section of the multi-step inner bore 4 until the quality requirement is met.
Example 3:
the main steps of this embodiment are the same as those of embodiment 2, wherein the outer wall of the clamping rod 1 is a smooth surface. The outer wall of the reamer rod 2 is covered with super-hard abrasive. The first 201, second 202, third 203 and fourth 204 reamer heads differ in granularity.
Example 4:
this embodiment is the same as embodiment 2, wherein the mesh number of the cutting edges 205 of the first reamer head 201, the second reamer head 202, the third reamer head 203 and the fourth reamer head 204 is different.
Example 5:
the main steps of this embodiment are the same as those of embodiment 2, wherein the reamer spindle 2 is made of ultrafine particle cemented carbide.
Example 6:
the main steps of this embodiment are the same as those of embodiment 2, wherein the clamping rod 1 is a morse tail shank or a straight shank tail shank.
Example 7:
the main steps of this embodiment are the same as those of embodiment 2, wherein a liquid outlet 206 is further disposed on the shank of the reamer shank 2. The liquid outlet 206 communicates with the cooling hole 3 and the outside of the reamer shank 2.
Example 8:
the main steps of the embodiment are the same as those of embodiment 2, wherein the rotating speed in step 4) is more than or equal to 1200 and less than or equal to 1500n/min, and the feeding amount is 0.1 mm/n.
Example 9:
the main steps of the embodiment are the same as those of embodiment 2, wherein in the step 5), a margin of 0.06-0.12 mm is left on the diameter of the multi-step inner hole 4.
Example 10:
the main steps of this example are the same as example 2, wherein, after step 6), there are associated steps of polishing, cleaning and rust-proofing.
Claims (9)
1. A multi-step inner hole machining method is characterized by comprising the following steps:
1) designing a cutter according to the structure of the multi-step inner hole (4) to be processed; wherein the cutter comprises a clamping rod (1) and a reamer rod (2); the cutter is provided with a through cooling hole (3) along the length direction; the reamer rod (2) comprises a first reamer head (201), a second reamer head (202), a third reamer head (203) and a fourth reamer head (204) which are coaxially arranged in sequence along the direction far away from the clamping rod (1); the first reamer head (201), the second reamer head (202), the third reamer head (203) and the fourth reamer head (204) are cylinders with diameters decreasing in sequence; the outer walls of the first reamer head (201), the second reamer head (202), the third reamer head (203) and the fourth reamer head (204) are provided with cutting edges (205) which are distributed in unequal teeth; the fourth reamer head (204) is provided with a countersink (2041) along the axis direction; the counter bore (2041) comprises a tapered expansion cavity and a threaded cavity; the part of the outer wall of the fourth reamer head (204) corresponding to the conical expansion cavity is provided with an expansion notch for axially cutting the conical expansion cavity; the countersunk bolt is screwed in the countersunk hole (2041); the nut of the countersunk head bolt abuts against the inner wall of the expansion cavity;
2) carrying out a process test, and determining the rotating speed S and the feeding quantity F of the cutter;
3) processing the end face of a workpiece blank (5), and pre-drilling a multi-step inner hole (4) on the workpiece;
4) taking the minimum aperture section on the multi-step inner hole (4) as a reference, and roughly hinging the whole multi-step inner hole (4) by using a matched reamer head;
5) semi-finish reaming is carried out on each aperture section of the multi-step inner hole (4) until a set machining allowance is reserved from the required size;
6) and (3) finely reaming each bore section of the multi-step inner bore (4) until the quality requirement is met.
2. The multi-step inner hole machining method according to claim 1, characterized in that: the outer wall of the clamping rod (1) is a smooth surface; the outer wall of the reamer rod (2) is covered with super-hard abrasive; the first reamer head (201), the second reamer head (202), the third reamer head (203) and the fourth reamer head (204) are different in granularity.
3. The multi-step inner hole machining method according to claim 1, characterized in that: the mesh number of the cutting edges (205) of the first reamer head (201), the second reamer head (202), the third reamer head (203) and the fourth reamer head (204) is different.
4. The multi-step inner hole machining method according to claim 1 or 2, characterized in that: the reamer rod (2) is made of ultrafine particle hard alloy materials.
5. The multi-step inner hole machining method according to claim 1, characterized in that: the clamping rod (1) is a Moire type tail handle or a straight handle tail handle.
6. The multi-step inner hole machining method according to claim 1, characterized in that: a liquid outlet hole (206) is also formed in the rod body of the reamer rod (2); the liquid outlet hole (206) is communicated with the cooling hole (3) and the outside of the reamer rod (2).
7. The multi-step inner hole machining method according to claim 1, characterized in that: in the step 4), the rotating speed is more than or equal to 1200 and less than or equal to 1500n/min, and the feeding amount is 0.1 mm/n.
8. The multi-step inner hole machining method according to claim 1, characterized in that: in the step 5), the diameter of the multi-step inner hole (4) is left with a margin of 0.06-0.12 mm.
9. The multi-step inner hole machining method according to claim 1, characterized in that: after step 6), there are associated steps of polishing, cleaning and rust-proofing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110937436.3A CN113751964A (en) | 2021-08-16 | 2021-08-16 | Multi-step inner hole machining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110937436.3A CN113751964A (en) | 2021-08-16 | 2021-08-16 | Multi-step inner hole machining method |
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| Publication Number | Publication Date |
|---|---|
| CN113751964A true CN113751964A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110937436.3A Pending CN113751964A (en) | 2021-08-16 | 2021-08-16 | Multi-step inner hole machining method |
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| CN (1) | CN113751964A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005238385A (en) * | 2004-02-26 | 2005-09-08 | Mitsubishi Materials Corp | Reamer |
| JP2012091258A (en) * | 2010-10-26 | 2012-05-17 | Fuji Seiko Ltd | Burnishing drill reamer |
| CN104551245A (en) * | 2013-10-29 | 2015-04-29 | 常州市海力工具有限公司 | Composite reamer |
| CN104607722A (en) * | 2015-02-02 | 2015-05-13 | 苏州阿诺精密切削技术股份有限公司 | High precision forming reamer |
| CN205888261U (en) * | 2016-05-31 | 2017-01-18 | 江苏金润汽车传动科技有限公司 | Long dark step reamer for spot facing work |
| CN107931723A (en) * | 2017-12-12 | 2018-04-20 | 苏州信能精密机械有限公司 | A kind of stepped hole honing reamer |
| CN110842290A (en) * | 2019-11-25 | 2020-02-28 | 常熟万克精密工具有限公司 | Multi-step PCD chip breaking reamer |
| CN111151820A (en) * | 2020-02-28 | 2020-05-15 | 苏州阿诺精密切削技术有限公司 | Multi-step forming reamer |
| CN211101908U (en) * | 2019-10-28 | 2020-07-28 | 锑玛（苏州）精密工具股份有限公司 | High-precision composite oil nozzle forming reamer for automobile |
| CN211966158U (en) * | 2020-02-28 | 2020-11-20 | 苏州睿摩精密刀具有限公司 | Welding integral hard alloy screw reamer |
-
2021
- 2021-08-16 CN CN202110937436.3A patent/CN113751964A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005238385A (en) * | 2004-02-26 | 2005-09-08 | Mitsubishi Materials Corp | Reamer |
| JP2012091258A (en) * | 2010-10-26 | 2012-05-17 | Fuji Seiko Ltd | Burnishing drill reamer |
| CN104551245A (en) * | 2013-10-29 | 2015-04-29 | 常州市海力工具有限公司 | Composite reamer |
| CN104607722A (en) * | 2015-02-02 | 2015-05-13 | 苏州阿诺精密切削技术股份有限公司 | High precision forming reamer |
| CN205888261U (en) * | 2016-05-31 | 2017-01-18 | 江苏金润汽车传动科技有限公司 | Long dark step reamer for spot facing work |
| CN107931723A (en) * | 2017-12-12 | 2018-04-20 | 苏州信能精密机械有限公司 | A kind of stepped hole honing reamer |
| CN211101908U (en) * | 2019-10-28 | 2020-07-28 | 锑玛（苏州）精密工具股份有限公司 | High-precision composite oil nozzle forming reamer for automobile |
| CN110842290A (en) * | 2019-11-25 | 2020-02-28 | 常熟万克精密工具有限公司 | Multi-step PCD chip breaking reamer |
| CN111151820A (en) * | 2020-02-28 | 2020-05-15 | 苏州阿诺精密切削技术有限公司 | Multi-step forming reamer |
| CN211966158U (en) * | 2020-02-28 | 2020-11-20 | 苏州睿摩精密刀具有限公司 | Welding integral hard alloy screw reamer |
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