CN114473086A - Innovative secondary thread machining method for numerically controlled lathe - Google Patents
Innovative secondary thread machining method for numerically controlled lathe Download PDFInfo
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- CN114473086A CN114473086A CN202210143558.XA CN202210143558A CN114473086A CN 114473086 A CN114473086 A CN 114473086A CN 202210143558 A CN202210143558 A CN 202210143558A CN 114473086 A CN114473086 A CN 114473086A
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- 238000003754 machining Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012937 correction Methods 0.000 claims abstract description 28
- 230000008439 repair process Effects 0.000 claims abstract description 5
- 238000003801 milling Methods 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 2
- 239000011295 pitch Substances 0.000 abstract description 10
- 238000007514 turning Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram 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
- 238000012797 qualification Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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Classifications
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- 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
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Abstract
The invention discloses an innovative secondary thread machining method for a numerically controlled lathe, 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 to the end; connecting a C-axis positioning block with a C-axis power head, locking a C-axis, and setting the angle at 0 ℃; placing a standard workpiece into the clamping jaw, wherein the positioning plane of the correction thread positioning block is parallel to the guide rail; manually moving the Y axis to a fixed position; the bottom surfaces of the positioning planes of the correcting thread positioning block and the C-axis positioning block are flat, the side surfaces of the correcting thread positioning block and the C-axis positioning block are close, and the clamping jaws are clamped tightly; manually moving the Y axis to enable the C axis positioning block to be upwards separated from the correction thread positioning block; unscrewing the correction thread positioning block from the standard workpiece and taking the correction thread positioning block down; and compiling a secondary thread repairing program, and performing secondary thread repairing on the workpiece to be repaired. The invention is suitable for workpieces with threads with large and small pitches and the repair of multi-thread threads, has high efficiency and extremely low investment, and reduces the problem of scrapping of the whole product caused by the thread problem.
Description
Technical Field
The invention relates to the technical field of machining, in particular to an innovative secondary machining method for threads of a numerically controlled lathe.
Background
With the development of the mechanical industry, precision machine tool equipment is widely applied, some multifunctional equipment is more and more, the machining efficiency is gradually improved, but the multifunctional equipment is influenced by some functions of a numerical control lathe, and in some machining aspects, one process can be basically completed, namely turning, milling, drilling, tapping and boring can be completed in one process. However, when some large-pitch threads are machined, the feed amount is too large, or when some counter bores are machined, the threads are often limited due to tool withdrawal; after some larger threads are machined, the thread depth is not in place due to a cutter or other reasons, or the thread depth is not smooth, so that the repair is difficult, but due to the high value of the products, if the thread is scrapped due to thread problems, the loss is large.
Therefore, those skilled in the art are devoted to developing an innovative thread secondary processing method of a numerically controlled lathe to solve the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In view of the defects in the prior art, the technical problem to be solved by the invention is how to provide an innovative secondary thread machining method for a numerically controlled lathe, so that a large-pitch thread or a counter bore thread is repaired or machined, and the machining yield is ensured to be more than 99%.
In order to realize the aim, the invention provides an innovative secondary thread machining method of a numerical control lathe, which comprises the following steps:
the method comprises the following steps of 1, providing a positioning tool, wherein the positioning tool comprises a correcting thread positioning block and a C-axis positioning block, the correcting thread positioning block is suitable for being connected with a standard workpiece with an internal thread, the C-axis positioning block is suitable for being connected with a C-axis power head of a numerically controlled lathe, and the correcting thread positioning block and the C-axis positioning block are provided with positioning planes matched with each other so as to perform C-axis reference 0-degree positioning;
step 2, connecting the correction thread block with the standard workpiece to enable the correction thread block to be screwed 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 degree;
step 4, placing the standard workpiece into a spindle jaw of the numerical control lathe to enable a positioning plane of the correction thread positioning block to be 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 arranged at a fixed position;
step 6, enabling the positioning planes of the correction thread positioning block and the C-axis positioning block to be flat and the side faces to be close, and clamping the main shaft clamping jaws to ensure that the threads start consistently;
step 7, manually moving a Y axis of the numerical control lathe to enable the C axis positioning block to be upwards separated from the correction thread positioning block;
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-shaft power head, programming a secondary thread repairing program, and performing secondary thread 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 part and a positioning part.
Further, 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 processed.
Further, the positioning part is a second cylinder with a first positioning plane cut on one side, 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 disposed.
Further, a line connecting a starting point of the external thread of the correction thread part and the coaxial axis after the starting point is vertically intersected 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, the C-axis positioning block body is cuboid and connected to one end of the clamping round rod, and the bottom surface of the C-axis positioning block body serves as a second positioning plane.
Further, the secondary rework thread procedure in step 9 uses the G32 command.
Further, in the step 9, the secondary thread repair procedure adopts multiple thread turning.
The invention has the beneficial effects that: the multi-thread repairing machine is suitable for workpieces with large and small thread pitches and repairing of multi-thread threads, is high in efficiency, extremely low in investment, high in efficiency and extremely low in investment, reduces the problem that a whole product is scrapped due to the thread problem, and reduces the problem that the whole product is scrapped due to the thread problem. When the thread is secondarily machined on the numerical control lathe, the position of the thread starting tooth cannot be accurately found, so that the thread which is secondarily machined is disordered, and the product is scrapped.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic view of a workpiece structure according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a preferred embodiment of the alignment screw positioning block of the present invention;
FIG. 3 is a front view of a corrective thread positioning block of a preferred embodiment of the present invention;
FIG. 4 is a right side view of a corrective thread positioning block of a preferred embodiment of the present invention;
FIG. 5 is a schematic structural diagram 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 locating block of a preferred embodiment of the present invention;
FIG. 7 is a right side view of the C-axis locating block of a preferred embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of technical contents. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
Examples
The workpiece to be machined in the embodiment is shown in fig. 1, a 4.375-16UN-2B thread (manufactured by U.S. 16 teeth per inch) is arranged in the workpiece, the small diameter of the thread is about phi 109.4mm, no tool withdrawal groove exists between the thread and the end surface, the thread depth is not in place due to too long machine tool withdrawal tail during machining, assembly cannot be carried out due to shallow thread depth during assembly, and if the product is scrapped due to the thread problem, loss is large, and delivery of the product is seriously influenced. The difficulty is often very big also very easily causes to scrap to purchase this kind of big screw tap and reprocess, but if go on the numerical control lathe to the screw thread reprocess, because of the secondary clamping, the screw thread often leads to indiscriminate tooth, leads to scrapping, just based on this problem, utilize present numerical control lathe equipment, increase C axle location frock, through lathe C axle and purpose-built special frock to work piece screw initial point alignment, carry out secondary operation to the screw thread through the numerical control program, reduce operator's intensity of labour and skill requirement, reprocess the screw thread, the reprocess qualification rate is at 99%.
The method has the advantages that the existing numerical control lathe equipment (a FANUC Oi-TF numerical control system is used in the embodiment) is utilized, the C-axis positioning tool is additionally arranged, the starting point of the workpiece thread is aligned through the C-axis of the machine tool and a special tool, the thread is secondarily machined through a numerical control program, the labor intensity and the skill requirement of an operator are reduced, the qualified rate after machining is 99.9%, the machining cost of the product is reduced, and scrappage 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 calibration thread block includes a calibration thread portion and a positioning portion, wherein the calibration thread portion is a cylinder with an external thread, the external thread of the calibration thread portion is matched with the internal thread of the workpiece to be processed, the positioning portion is formed by milling a plane on one side of the cylinder with a diameter smaller than that of the calibration thread portion, the positioning portion and the calibration thread portion are integrally processed, and the cylinder of the positioning portion and the cylinder of the calibration thread portion are coaxially arranged. The connecting line of the starting point of the external thread and the axis after vertical intersection is parallel to the plane milled at one side of the positioning part.
As shown in fig. 5 to 7, the C-axis positioning block includes an integral clamping round bar and a C-axis positioning block body, and the C-axis positioning block body is in a rectangular parallelepiped shape and is connected to one end of the clamping round bar. The bottom surface of the C-axis positioning block is matched with a plane milled at one side of the positioning part to be used as a positioning plane, so that the positioning plane becomes the basis for positioning the C-axis angle reference of 0 degree.
The secondary thread machining of the numerical control lathe comprises the following specific machining steps:
1. and before the secondary processing of the thread, a corrected thread positioning block and a C-axis positioning block are processed.
2. The calibration thread block is used to connect to a machined standard workpiece (as shown in fig. 1) taking care that the calibration thread block has to be screwed to the bottom.
3. The C-axis positioning block is connected to a C-axis power head of the numerical control lathe, a C-axis of the lathe is locked, the C-axis is 0 degree, and the consistency of workpieces is guaranteed.
4. A workpiece is placed in a main shaft clamping jaw, and the positioning plane of the positioning part is parallel to a machine tool guide rail, so that the clamping jaw cannot clamp tightly.
5. The Y-axis is moved manually to place the Y-coordinate at a fixed (26.05 mm in this example) position, noting that the alignment screw and C-axis alignment blocks cannot jam during movement.
6. The bottom surfaces of the positioning planes of the correcting thread positioning block and the C-axis positioning block are flat, the side surfaces of the correcting thread positioning block and the C-axis positioning block are close to each other, and the clamping jaws are clamped tightly, so that the threads are guaranteed to have consistent teeth, and the threads can be completely fixed.
7. And manually moving the Y axis to enable the C axis positioning block to be upwards separated from the correction thread positioning block.
8. And unscrewing and taking down the correction thread positioning block from the workpiece, and only after taking down the correction thread positioning block, carrying out thread machining.
The thread machining is carried out according to the program shown in the figure, the first product needs to correct the thread, the thread cutter is ensured to be matched with the thread of the product during machining, and the subsequent correction is not needed. The method is characterized in that a secondary repaired thread program is compiled, the repaired thread program is particularly important, the G32 instruction can be used for thread turning, G76 or G92 cannot be used, if the cutter is started from the middle in the process of repairing the thread, the thread at the position of the cutter start can be burnt out, and G32 can ensure that the cutter connection is smooth. G92 processes the screw thread, the starting point can be controlled, but the screw thread retracting control is inconvenient, G76 is suitable for large-pitch turning and inclined feed, and the feed point is not controllable. The starting point and the retracting point of the G32 thread machining can be easily controlled, so that G32 must be used for thread secondary machining.
The secondary thread repair procedure is as follows:
M3S500 (Main shaft positive rotation, 500 rpm)
G0X100.Z30 (cutter moves quickly to 100 mm excircle, 30 mm distance from the end face of the workpiece)
G99Z2 (returning of the tool to the reference plane)
#1＝22.921
#2＝#1-1.587
G0Z- #2 (cutter moved to the starting point)
G1G99X108.5F.5
G32X110.Z- #1F1.587 (first thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105 (tool back to the 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 the 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 the starting point)
Z-16.
Z-#2
X108.5
G32X111.Z- #1F1.587 (fourth thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105 (tool back to the starting point)
Z-16.
Z-#2
X108.5
G32X111.2Z- #1F1.587 (fifth thread turning)
G32Z-26.F1.587
G32X108.5Z-26.2F1.587
G0X105 (tool exit)
Z-16.
……
Processing and analyzing: the thread secondary processing of the innovative numerical control lathe is used for quickly and effectively solving the problem of large-pitch or directly larger product threads, a threading tool is used, the rotation speed of a numerical lathe can be adjusted to be 200-10000 rpm, the feeding is the same as the pitch, the processed threads completely meet the use requirement, the defect that the large-pitch threads cannot be reworked is avoided, and the thread secondary processing is also a large expansion of the functions of the numerical control lathe.
The invention can solve the problem that the depth of the counter bore thread is not in place or the large-pitch thread can not be directly turned, and the invention can greatly improve the processing efficiency and the product quality of part of parts of enterprises.
The embodiment of the invention can well solve the problems that the depth of the counter bore thread is not in place or the large-pitch thread can not be directly turned, and greatly improves the processing efficiency and the product quality of partial parts.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. An innovative secondary thread machining method of a numerically controlled lathe is characterized by comprising the following steps:
the method comprises the following steps of 1, providing a positioning tool, wherein the positioning tool comprises a correcting thread positioning block and a C-axis positioning block, the correcting thread positioning block is suitable for being connected with a standard workpiece with an internal thread, the C-axis positioning block is suitable for being connected with a C-axis power head of a numerically controlled lathe, and the correcting thread positioning block and the C-axis positioning block are provided with positioning planes matched with each other so as to perform C-axis reference 0-degree positioning;
step 2, connecting the correction thread block with the standard workpiece to enable the correction thread block to be screwed 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 degree;
step 4, placing the standard workpiece into a spindle jaw of the numerical control lathe to enable a positioning plane of the correction thread positioning block to be 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 arranged at a fixed position;
step 6, enabling the positioning planes of the correction thread positioning block and the C-axis positioning block to be flat and the side faces to be close, and clamping the main shaft clamping jaws to ensure that the threads start consistently;
step 7, manually moving a Y axis of the numerical control lathe to enable the C axis positioning block to be upwards separated from the correction thread positioning block;
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-shaft power head, programming a secondary thread repairing program, and performing secondary thread repairing on the workpiece to be repaired.
2. The innovative numerically controlled lathe thread secondary machining method according to claim 1, characterized in that said numerically controlled lathe uses the FANUC Oi-TF numerical control system.
3. The innovative numerically controlled lathe thread secondary machining method of claim 1, characterized in that the corrective thread block comprises a corrective thread portion and a positioning portion.
4. The innovative numerically controlled lathe thread secondary machining method of claim 3, characterized in that the corrective thread portion is a first cylinder with an external thread that mates with an internal thread of the workpiece to be machined.
5. The innovative numerically controlled lathe thread secondary machining method of claim 4, characterized in that said positioning portion is a second cylinder with a first positioning plane truncated on one side thereof, the diameter of said second cylinder being smaller than the diameter of said first cylinder.
6. The innovative numerically controlled lathe thread secondary machining method of claim 5, characterized in that said second cylinder and said first cylinder are arranged coaxially.
7. The innovative numerically controlled lathe thread secondary processing method according to claim 6, characterized in that a line which is a line obtained by perpendicularly intersecting the starting point of the external thread of the corrective thread portion and the coaxial axis is parallel to the first positioning plane.
8. The innovative numerically controlled lathe thread secondary machining method according to claim 7, characterized in that the C-axis positioning block includes a clamping round bar and a C-axis positioning block body, the C-axis positioning block body is in a rectangular parallelepiped shape and is connected to one end of the clamping round bar, and a bottom surface of the C-axis positioning block body serves as a second positioning plane.
9. The innovative numerically controlled lathe thread secondary machining method according to claim 1, characterized in that in said step 9 said secondary thread repair program uses G32 instructions.
10. The innovative numerically controlled lathe thread secondary machining method of claim 9, characterized in that in step 9 the secondary rework thread procedure employs multiple thread turns.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN114473086A true CN114473086A (en) | 2022-05-13 |
| CN114473086B CN114473086B (en) | 2024-03-19 |
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| 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 |
| US20170066100A1 (en) * | 2015-07-24 | 2017-03-09 | Terry A. Lewis | Thread repair tools and methods of making and using the same |
| 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 |
-
2022
- 2022-02-17 CN CN202210143558.XA patent/CN114473086B/en active Active
Patent Citations (8)
| 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 |
| US20140141896A1 (en) * | 2011-08-25 | 2014-05-22 | Ricoh Elemex Corporation | Method of Manufacturing Screw Thread 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 |
| US20170066100A1 (en) * | 2015-07-24 | 2017-03-09 | Terry A. Lewis | Thread repair tools and methods of making and using the same |
| 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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