CN114473086B - Innovative numerical control lathe thread secondary machining method - Google Patents
Innovative numerical control lathe thread secondary machining method Download PDFInfo
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- CN114473086B CN114473086B CN202210143558.XA CN202210143558A CN114473086B CN 114473086 B CN114473086 B CN 114473086B CN 202210143558 A CN202210143558 A CN 202210143558A CN 114473086 B CN114473086 B CN 114473086B
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- 238000003754 machining Methods 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 20
- 238000012937 correction Methods 0.000 claims abstract description 39
- 238000003672 processing method Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims description 11
- 238000007514 turning Methods 0.000 claims description 10
- 238000003801 milling Methods 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims description 2
- 239000011295 pitch Substances 0.000 abstract description 10
- 238000012797 qualification Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G9/00—Working screws, bolt heads, or nuts in conjunction with thread cutting, e.g. slotting screw heads or shanks, removing burrs from screw heads or shanks; Finishing, e.g. polishing, any screw-thread
- B23G9/009—Thread cleaning or repairing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/18—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for positioning only
Abstract
The invention discloses an innovative numerical control lathe thread secondary processing method, which comprises the following steps: providing a positioning tool comprising a correction thread positioning block and a C-axis positioning block; connecting the correction thread block with a standard workpiece with internal threads, and screwing the correction thread block to the bottom; connecting a C-axis positioning block with a C-axis power head, locking a C-axis, and setting 0 degrees; placing a standard workpiece into the clamping jaw, and correcting the positioning plane of the thread positioning block to be parallel to the guide rail; manually moving the Y-axis to a fixed position; the bottom surfaces of the positioning planes of the correction thread positioning blocks and the C-axis positioning blocks are flatly attached, the side surfaces are abutted, and the clamping jaws are clamped; manually moving the Y-axis to enable the C-axis positioning block to be upwards away from the correction thread positioning block; unscrewing the correction thread positioning block from the standard workpiece; and (3) compiling a secondary repairing thread program, and performing thread secondary repairing on the workpiece to be repaired. The invention is suitable for repairing workpieces with large and small screw pitches and multi-thread threads, has high efficiency and extremely low investment, and reduces the problem of scrapping of the whole product caused by the problem of threads.
Description
Technical Field
The invention relates to the technical field of machining, in particular to an innovative numerical control lathe thread secondary machining method.
Background
Along with the development of the mechanical industry, precision machine tool equipment is widely used, some multifunctional equipment is more and more, the machining efficiency is gradually improved, the precision machine tool equipment is affected by functions of a numerical control lathe, and in some machining aspects, one working procedure can be basically finished, namely turning, milling, drilling, tapping and boring can be finished in one working procedure. However, when some large-pitch threads are processed, the feed amount is too large, or when some counter bores are processed, certain limitation is often caused by tool withdrawal; after some large threads are machined, the depth of the threads is not proper due to a cutter or other reasons, or the repair is difficult due to the fact that the thread is not proper, but the large loss is caused if the threads are scrapped due to the fact that the products are high in value.
Accordingly, those skilled in the art have focused on developing an innovative numerical control lathe thread secondary machining method to solve the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an innovative numerical control lathe thread secondary processing method, which is capable of repairing or processing a large pitch thread or a counter bore thread, and ensuring a processing qualification rate of more than 99%.
In order to achieve the above purpose, the invention provides an innovative numerical control lathe thread secondary processing method, which comprises the following steps:
step 1, providing a positioning tool, wherein the positioning tool comprises a correction thread positioning block and a C-axis positioning block, the correction thread positioning block is suitable for being connected with a standard workpiece with internal threads, the C-axis positioning block is suitable for being connected with a C-axis power head of a numerical control lathe, and the correction thread positioning block and the C-axis positioning block are provided with mutually matched positioning planes for positioning the C-axis reference by 0 degrees;
step 2, connecting the correction thread block with the standard workpiece, and screwing the correction thread block to the bottom;
step 3, connecting the C-axis positioning block to the C-axis power head, locking the C-axis of the numerically controlled lathe, and setting the C-axis to be 0 degrees;
step 4, placing the standard workpiece into a main shaft claw of the numerical control lathe, so that a positioning plane of the correction thread positioning block is parallel to a guide rail of the numerical control lathe;
step 5, manually moving the Y axis of the numerical control lathe to enable the Y coordinate to be placed at a fixed position;
step 6, enabling the positioning planes of the correction thread positioning block and the C-axis positioning block to be flatly attached, enabling the side surfaces to be close, and clamping the main shaft clamping jaw to ensure that thread starting is consistent;
step 7, manually moving a Y-axis of the numerical control lathe to enable the C-axis positioning block to be upwards away from the correction thread positioning block;
step 8, unscrewing the correction thread positioning block from the standard workpiece, and taking down the correction thread positioning block;
and 9, clamping the workpiece to be repaired on the main shaft clamping jaw, clamping the thread milling cutter on the C-axis power head, compiling a secondary repairing thread program, and performing thread secondary repairing on the workpiece to be repaired.
Further, the numerically controlled lathe uses a FANUC Oi-TF numerical control system.
Further, the correction screw block includes a correction screw portion and a positioning portion.
Further, the correcting thread part is a first cylinder with external threads, and the external threads are matched with the internal threads of the workpiece to be processed.
Further, the positioning portion is a second cylinder which cuts a first positioning plane at one side thereof, and the diameter of the second cylinder is smaller than that of the first cylinder.
Further, the second cylinder and the first cylinder are coaxially arranged.
Further, a line after the start point of the external thread of the correction thread part perpendicularly intersects with the coaxial axis is parallel to the first positioning plane.
Further, the C-axis positioning block comprises a clamping round rod and a C-axis positioning block body, wherein the C-axis positioning block body is in a cuboid shape and is connected to one end of the clamping round rod, and the bottom surface of the C-axis positioning block body is used as a second positioning plane.
Further, the secondary thread repairing procedure in step 9 uses a G32 instruction.
Further, the secondary repairing thread procedure in step 9 employs multiple thread turning.
The beneficial effects of the invention are as follows: the device is suitable for workpieces with large and small screw pitches and repairing of multi-thread threads, is high in efficiency and extremely low in investment, reduces the problem that the whole product is scrapped due to the thread problem, is high in efficiency and extremely low in investment, and reduces the problem that the whole product is scrapped due to the thread problem. The invention well solves the problem of searching for the thread starting teeth, thereby effectively solving the secondary processing of the threads on the numerical control lathe.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 is a schematic view of a workpiece structure in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a calibration screw positioning block according to a preferred embodiment of the present invention;
FIG. 3 is a front view of a corrective screw positioning block of a preferred embodiment of the present invention;
FIG. 4 is a right side view of a corrective thread locating block of a preferred embodiment of the present invention;
FIG. 5 is a schematic view of a C-axis positioning block according to a preferred embodiment of the present invention;
FIG. 6 is a front view of a C-axis positioning block of a preferred embodiment of the present invention;
fig. 7 is a right side view of a C-axis positioning block according to a preferred embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention refers to the accompanying drawings, which make the technical contents thereof more clear and easier to understand. The present invention may be embodied in many different forms of embodiments and the scope of the present invention is not limited to only the embodiments described herein.
In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present invention is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.
Examples
The workpiece to be machined in this embodiment is shown in fig. 1, and has a 4.375-16UN-2B thread (made by america, 16 threads per inch) inside, the minor diameter of the thread is about phi 109.4mm, the thread and the end face have no tool withdrawal groove, the thread depth is not in place due to overlong tail withdrawal of a machine tool during machining, and the workpiece cannot be assembled due to shallow thread depth during assembly, if the product is scrapped due to the thread problem, the loss is large, and the delivery of the product is seriously affected. Purchasing such a large screw tap is very difficult and is very easy to discard, but if the screw thread is reworked on a numerical control lathe, the screw thread is messy due to secondary clamping, so that the screw thread is scrapped, based on the problem, the existing numerical control lathe equipment is utilized, a C-axis positioning tool is added, the starting point of the screw thread of a workpiece is aligned through a machine tool C-axis and a special tool, the screw thread is secondarily machined through a numerical control program, the labor intensity and skill requirements of an operator are reduced, the screw thread is reworked, and the repair qualification rate is 99%.
The existing numerical control lathe equipment (FANUC Oi-TF numerical control system is used in the embodiment) is utilized, a C-axis positioning tool is added, a workpiece thread starting point is aligned through a machine tool C axis and a special tool, the threads are subjected to secondary machining through a numerical control program, the labor intensity and skill requirements of operators are reduced, the qualification rate after machining is 99.9%, the machining cost of products is reduced, and scrapping is reduced.
The embodiment provides a positioning tool for secondary machining of threads of a numerical control lathe, which comprises a correction thread positioning block and a C-axis positioning block, as shown in fig. 2 to 7.
As shown in fig. 2 to 4, the correcting thread block comprises a correcting thread part and a positioning part, wherein the correcting thread part is a cylinder with external threads, the external threads are matched with the internal threads of a workpiece to be processed, the positioning part is formed by milling a plane on one side of the cylinder with the diameter smaller than that of the correcting thread part, the positioning part and the correcting thread part are integrally processed, and the cylinder of the positioning part and the cylinder of the correcting thread part are coaxially arranged. The connecting line after the starting point of the external thread and the axis are perpendicularly intersected is parallel to a plane milled on one side of the positioning part.
As shown in fig. 5 to 7, the C-axis positioning block includes an integral grip round bar and a C-axis positioning block body, which is rectangular in shape, connected to one end of the grip round bar. The bottom surface of the C-axis positioning block is matched with a plane milled on one side of the positioning part to serve as a positioning plane, so that the positioning plane becomes the basis for positioning the C-axis angle reference by 0 degrees.
The numerical control lathe thread secondary machining comprises the following specific machining steps:
1. and a correction thread positioning block and a C-axis positioning block are firstly processed before secondary processing of the threads.
2. The calibration screw block is used to connect to a machined standard workpiece (as shown in fig. 1), taking care that the calibration screw block must be screwed to the bottom.
3. C-axis positioning blocks are connected to a C-axis power head of a numerical control lathe, the C-axis of the lathe is locked, and the C-axis is 0 degree, so that the consistency of workpieces is ensured.
4. The workpiece is placed in the clamping jaw of the main shaft, and the clamping jaw cannot clamp when the positioning plane of the positioning part is parallel to the guide rail of the machine tool.
5. The Y-axis is manually moved to place the Y-coordinate in a fixed (26.05 mm in this embodiment) position, taking care that the correction screw positioning block and the C-axis positioning block cannot be locked during movement.
6. Note that the bottom surfaces of the positioning planes of the correction thread positioning block and the C-axis positioning block are flatly attached, the side surfaces are abutted, and the clamping jaw is clamped, so that the consistency of thread starting is ensured, and the complete fixation can be realized.
7. And manually moving the Y-axis to enable the C-axis positioning block to be upwards away from the correction thread positioning block.
8. And unscrewing the correction thread positioning block from the workpiece, taking down the correction thread positioning block, and then carrying out thread machining after taking down the correction thread positioning block.
The thread processing is processed according to the program shown in the following chart, the first product needs to correct the thread, the thread cutter is ensured to be matched with the thread of the product during processing, and the later correction is not needed. The secondary repairing thread program is especially important, the repairing thread program can only use G32 instruction to carry out thread turning, G76 or G92 cannot be used, if the cutter is lifted from the middle during repairing the thread, the thread at the lifting position is broken, and G32 can ensure smooth cutter connection. G92 is used for machining threads, a tool starting point can be controlled, but thread tool withdrawal control is inconvenient, and G76 is suitable for large-pitch turning, oblique tool feeding and uncontrollable tool feeding points. The start point and the withdrawal point of the G32 machining thread can be easily controlled, so the G32 must be used for secondary machining of the thread.
The secondary thread repairing procedure is specifically as follows:
M3S500 (Main shaft forward rotation, rotation speed 500 rpm)
G0x100.z30. (the tool is moved quickly to the outer circle 100 mm, the length is 30 mm from the end face of the workpiece)
G99Z2. (tool back to reference plane)
#1＝22.921
#2＝#1-1.587
G0Z- #2 (tool to start point)
G1G99X108.5F.5
G32X1110.Z- #1F1.587 (first thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105. (tool back to starting point)
Z-16.
Z-#2
X108.5
G32X110.5Z- #1F1.587 (second thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105. (tool back to starting point)
Z-16.
Z-#2
X108.5
G32X110.8Z- #1F1.587 (third thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105. (tool back to starting point)
Z-16.
Z-#2
X108.5
G32X1111.Z- #1F1.587 (fourth thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105. (tool back to starting point)
Z-16.
Z-#2
X108.5
G32X111.2Z- #1F1.587 (fifth screw thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105. (tool exit)
Z-16.
……
Processing analysis: the novel numerical control lathe thread secondary processing is used for rapidly and effectively solving the problem of large thread pitch or directly larger product threads, a threading tool is used, the rotating speed of the numerical control lathe is adjustable by 200-10000 revolutions per minute, the feeding speed is the same as the thread pitch, the processed threads completely meet the use requirement, the defect that the large thread pitch threads cannot be reworked is avoided, and the numerical control lathe is also a large expansion of the functions of the numerical control lathe.
As can be seen from the above examples, the problems that the depth of the counter bore thread is not in place or the large-pitch thread cannot be turned directly can be solved well by using the invention, and the processing efficiency and the product quality of parts of enterprises can be improved greatly by using the invention.
According to the embodiment, the problems that the depth of the counter bore thread is not in place or the large-pitch thread cannot be turned directly can be solved well by using the method, and the processing efficiency and the product quality of part parts are improved greatly.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The innovative numerical control lathe thread secondary processing method is characterized by comprising the following steps of:
step 1, providing a positioning tool, wherein the positioning tool comprises a correction thread positioning block and a C-axis positioning block, the correction thread positioning block is suitable for being connected with a standard workpiece with internal threads, the C-axis positioning block is suitable for being connected with a C-axis power head of a numerical control lathe, and the correction thread positioning block and the C-axis positioning block are provided with mutually matched positioning planes for positioning the C-axis reference by 0 degrees;
step 2, connecting the correction thread positioning block with the standard workpiece, and screwing the correction thread positioning block to the bottom;
step 3, connecting the C-axis positioning block to the C-axis power head, locking the C-axis of the numerically controlled lathe, and setting the C-axis to be 0 degrees;
step 4, placing the standard workpiece into a main shaft claw of the numerical control lathe, so that a positioning plane of the correction thread positioning block is parallel to a guide rail of the numerical control lathe;
step 5, manually moving the Y axis of the numerical control lathe to enable the Y axis coordinate to be placed at a fixed position;
step 6, enabling the positioning planes of the correction thread positioning block and the C-axis positioning block to be flatly attached, enabling the side surfaces to be close, and clamping the main shaft clamping jaw to ensure that thread starting is consistent;
step 7, manually moving a Y-axis of the numerical control lathe to enable the C-axis positioning block to be upwards away from the correction thread positioning block;
step 8, unscrewing the correction thread positioning block from the standard workpiece, and taking down the correction thread positioning block;
and 9, clamping the workpiece to be repaired on the main shaft clamping jaw, clamping the thread milling cutter on the C-axis power head, compiling a secondary repairing thread program, and performing thread secondary repairing on the workpiece to be repaired.
2. The innovative numerically controlled lathe thread secondary machining method of claim 1, wherein the numerically controlled lathe uses a FANUC Oi-TF numerically controlled system.
3. The innovative numerically controlled lathe thread secondary machining method of claim 1, wherein the corrective thread locating block comprises a corrective thread portion and a locating portion.
4. The innovative numerically controlled lathe thread secondary machining method according to claim 3, wherein the correcting thread part is a first cylinder with an external thread, and the external thread is matched with an internal thread of a workpiece to be machined.
5. The innovative numerically controlled lathe thread secondary machining method according to claim 4, wherein the positioning portion is a second cylinder that cuts a first positioning plane at one side thereof, and the diameter of the second cylinder is smaller than the diameter of the first cylinder.
6. The innovative numerically controlled lathe thread secondary machining method of claim 5, wherein the second cylinder and the first cylinder are coaxially disposed.
7. The method of claim 6, wherein a line of the start point of the external thread of the correction thread portion perpendicularly intersecting the coaxial axis is parallel to the first positioning plane.
8. The innovative numerically controlled lathe thread secondary processing method according to claim 7, wherein the C-axis positioning block comprises a clamping round bar and a C-axis positioning block body, the C-axis positioning block body is in a cuboid shape and is connected to one end of the clamping round bar, and the bottom surface of the C-axis positioning block body is used as a second positioning plane.
9. The method of claim 1, wherein the secondary thread repair procedure in step 9 uses a G32 instruction.
10. The method for secondary processing of threads on an innovative numerically controlled lathe according to claim 9, wherein the secondary thread repairing procedure in the step 9 adopts multiple thread turning.
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| CN202210143558.XA CN114473086B (en) | 2022-02-17 | 2022-02-17 | Innovative numerical control lathe thread secondary machining method |
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| CN202210143558.XA CN114473086B (en) | 2022-02-17 | 2022-02-17 | Innovative numerical control lathe thread secondary machining method |
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| CN114473086B true CN114473086B (en) | 2024-03-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10166222A (en) * | 1996-12-10 | 1998-06-23 | Fanuc Ltd | Screw remachining method for lathe |
| CN102744472A (en) * | 2012-04-20 | 2012-10-24 | 沈阳工业大学 | Device for mechanically positioning screw tracks on numerical control thread repairing lathe and positioning method |
| CN103619522A (en) * | 2011-08-25 | 2014-03-05 | 理光越岭美有限公司 | Screw thread manufacturing method and screw thread |
| CN103894684A (en) * | 2014-04-11 | 2014-07-02 | 贵州红林机械有限公司 | Numerically-controlled secondary cutting method for threaded inner hole of thread ring gauge and special fixture for numerically-controlled secondary turning method |
| CN110722220A (en) * | 2019-10-18 | 2020-01-24 | 北部湾大学 | Method for numerically-controlled internal thread turning and repairing by changing rotating speed of main shaft |
| CN113352150A (en) * | 2021-07-22 | 2021-09-07 | 姜健 | Thread secondary clamping positioning gauge for numerical control lathe and application thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017019497A1 (en) * | 2015-07-24 | 2017-02-02 | Lewis Terry A | Thread repair tools and methods of making and using the same |
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2022
- 2022-02-17 CN CN202210143558.XA patent/CN114473086B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10166222A (en) * | 1996-12-10 | 1998-06-23 | Fanuc Ltd | Screw remachining method for lathe |
| CN103619522A (en) * | 2011-08-25 | 2014-03-05 | 理光越岭美有限公司 | Screw thread manufacturing method and screw thread |
| CN102744472A (en) * | 2012-04-20 | 2012-10-24 | 沈阳工业大学 | Device for mechanically positioning screw tracks on numerical control thread repairing lathe and positioning method |
| CN103894684A (en) * | 2014-04-11 | 2014-07-02 | 贵州红林机械有限公司 | Numerically-controlled secondary cutting method for threaded inner hole of thread ring gauge and special fixture for numerically-controlled secondary turning method |
| CN110722220A (en) * | 2019-10-18 | 2020-01-24 | 北部湾大学 | Method for numerically-controlled internal thread turning and repairing by changing rotating speed of main shaft |
| CN113352150A (en) * | 2021-07-22 | 2021-09-07 | 姜健 | Thread secondary clamping positioning gauge for numerical control lathe and application thereof |
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| CN114473086A (en) | 2022-05-13 |
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