CN109047869B - Semi-closed space thread machining method - Google Patents
Semi-closed space thread machining method Download PDFInfo
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- CN109047869B CN109047869B CN201810810853.XA CN201810810853A CN109047869B CN 109047869 B CN109047869 B CN 109047869B CN 201810810853 A CN201810810853 A CN 201810810853A CN 109047869 B CN109047869 B CN 109047869B
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- milling
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- milling head
- zero point
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
-
- 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
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/32—Thread cutting; Automatic machines specially designed therefor by milling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
- Numerical Control (AREA)
Abstract
The invention discloses a semi-closed space thread machining method, which completes the work of a five-axis machining center by using the combination of a universal milling head and a right-angle milling head, using a special machining process method and adopting a three-axis machining center, and the precision of a machined product completely meets the working requirement, so that the cost is low, and the economic benefit is higher. The invention is used in the field of thread machining methods.
Description
Technical Field
The invention relates to the field of thread machining methods, in particular to a semi-closed space thread machining method.
Background
Because the space is minimum, the distance between the threaded hole of the side wall and the side edge and the distance between the threaded hole of the side wall and the bottom edge are too small, the size and the power of the existing machine tool accessory are difficult to meet the requirements. If the five-axis linkage machining center is adopted, the coordinate system can be conveniently converted, the conversion efficiency is high, but the five-axis linkage machining center is suitable for precision machining and has higher cost.
Disclosure of Invention
The invention aims to provide a processing technical scheme for processing a large threaded hole in a narrow space in a triaxial processing center, which meets the requirements.
The technical scheme adopted by the invention is as follows:
a semi-closed space thread machining method comprises the following steps:
1) mounting a right-angle milling head on a main shaft of a three-shaft machine tool, adjusting the direction of the main shaft of the right-angle milling head to be consistent with the direction of the central line of a threaded hole, aligning the zero point of a workpiece, mounting a first milling cutter on the right-angle milling head, and milling a central hole;
2) replacing the right-angle milling head with a universal milling head, rotating the universal milling head to enable the direction of a main shaft of the universal milling head to be consistent with the direction of the center of the threaded hole, aligning, installing a second milling cutter, and milling a center hole;
3) and installing a thread milling cutter, aligning the zero point of the workpiece, and then milling the threaded hole.
Further as an improvement of the technical scheme of the invention, the step of milling the threaded hole comprises rough milling and finish milling.
Further as an improvement of the technical scheme of the invention, step 1) is to adjust the main shaft of the right-angle milling head by a coordinate system conversion method of any bevel processing, and the coordinate system conversion method comprises the following steps:
A. finding out the normal direction of the spatial inclined plane passing through the zero point of the workpiece, designating the zero point of the workpiece as a passing point by a reference axis command and adopting a point and direction method, and converting the normal direction of the spatial inclined plane into a reference coordinate system by taking the normal direction of the spatial inclined plane as a direction;
B. adjusting the direction of the main shaft of the three-shaft machine tool to be consistent with the direction of the reference shaft;
C. and measuring a 3D angle between the reference axis and a Z axis of the coordinate system, measuring a projection angle between the reference axis and an X axis in an XY plane, and adjusting the rotation angle of the milling head according to the angle.
Further as an improvement of the technical scheme of the invention, step 1) finds out the zero point of the workpiece by a workpiece zero point conversion method of the spatial inclined plane spatial hole, wherein the workpiece zero point conversion method comprises the following steps:
a. installing a reference ball in front of a rotary coordinate system to a hole in which a zero point is located;
b. and (4) touching the reference ball by using the tip of the machine tool, wherein the tip of the machine tool is just touched with the highest point of the spherical surface of the reference ball.
The invention has the beneficial effects that: according to the semi-closed space thread machining method, the combination of the universal milling head and the right-angle milling head is used, a special machining process method is used, the three-axis machining center is adopted, the five-axis machining center is completed, the precision of a machined product completely meets the working requirement, the cost is low, and the economic benefit is high.
Detailed Description
The invention relates to a semi-closed space thread processing method, which comprises the following steps:
1) mounting a right-angle milling head on a main shaft of a three-shaft machine tool, adjusting the direction of the main shaft of the right-angle milling head to be consistent with the direction of the central line of a threaded hole, aligning the zero point of a workpiece, mounting a first milling cutter on the right-angle milling head, and milling a central hole;
2) replacing the right-angle milling head with a universal milling head, rotating the universal milling head to enable the direction of a main shaft of the universal milling head to be consistent with the direction of the center of the thread, aligning, installing a second milling cutter, and milling a center hole;
3) and installing a thread milling cutter, aligning the zero point of the workpiece, and then milling the threaded hole.
According to the semi-closed space thread machining method, the combination of the universal milling head and the right-angle milling head is used, a special machining process method is used, the three-axis machining center is adopted, the five-axis machining center is completed, the precision of a machined product completely meets the working requirement, the cost is low, and the economic benefit is high.
In a preferred embodiment of the invention, when milling the threaded hole, the threaded hole is firstly roughly machined, and then the threaded hole is finely machined according to the go-no-go gauge, so that the threaded hole is qualified once.
As a preferred embodiment of the present invention, step 1) is to adjust a spindle of a rectangular milling head by a coordinate system conversion method of arbitrary bevel processing, the coordinate system conversion method including the steps of:
A. finding out the normal direction of the spatial inclined plane passing through the zero point of the workpiece, designating the zero point of the workpiece as a passing point by a reference axis command and adopting a point and direction method, and converting the normal direction of the spatial inclined plane into a reference coordinate system by taking the normal direction of the spatial inclined plane as the direction;
B. adjusting the direction of the main shaft of the three-shaft machine tool to be consistent with the direction of the reference shaft;
C. and measuring a 3D angle between the reference axis and a Z axis of the coordinate system, measuring a projection angle between the reference axis and an X axis in an XY plane, and adjusting the rotation angle of the milling head according to the angle.
In the drawing software, a reference axis command is used, a point and direction method is adopted, a workpiece zero point is designated as a pass point, the normal direction of a space inclined plane is taken as a direction, the normal direction of the space inclined plane is converted into a reference coordinate system, the direction of a main shaft is adjusted to be consistent with the direction of the reference axis, the main shaft of a machine tool can be ensured to be vertical to the cutting space inclined plane, a 3D angle between the reference axis and a Z axis of the coordinate system is measured, a projection angle between the reference axis and an X axis in an XY plane is measured, and after the angle is measured, the rotation angle of a milling head can be adjusted according to the angle.
As a preferred embodiment of the present invention, step 1) finds a zero point of a workpiece by a workpiece zero point conversion method of a spatial inclined plane spatial hole, the workpiece zero point conversion method including the steps of:
a. installing a reference ball in front of a rotary coordinate system to a hole in which a zero point is located;
b. and (4) touching the reference ball by using the tip of the machine tool, wherein the tip of the machine tool is just touched with the highest point of the spherical surface of the reference ball.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (2)
1. A semi-closed space thread machining method is characterized in that: the method comprises the following steps:
s1: installing the right-angle milling head on a main shaft of a three-axis machine tool, and adjusting the direction of the main shaft of the right-angle milling head to be consistent with the direction of the central line of a threaded hole by a coordinate system conversion method for processing any inclined plane, wherein the coordinate system conversion method comprises the following steps:
A. finding out the normal direction of the spatial inclined plane passing through the zero point of the workpiece, designating the zero point of the workpiece as a passing point by a reference axis command and adopting a point and direction method, and converting the normal direction of the spatial inclined plane into a reference coordinate system by taking the normal direction of the spatial inclined plane as the direction;
B. adjusting the direction of the main shaft of the three-shaft machine tool to be consistent with the direction of the reference shaft;
C. measuring a 3D angle between a reference axis and a Z axis of a world coordinate system, measuring a projection angle between the reference axis and an X axis in an XY plane, and adjusting a rotation angle of the milling head according to the angle;
s2: the zero point of the workpiece is found out by a workpiece zero point conversion method of the spatial inclined plane spatial hole, and the workpiece zero point conversion method comprises the following steps:
a. installing a reference ball in a hole where a zero point is located before coordinate system conversion;
b. the center of the machine tool touches the reference ball, and the center of the machine tool touches the highest point of the spherical surface of the reference ball;
s3: a first milling cutter is arranged on the right-angle milling head to mill a central hole;
s4: replacing the right-angle milling head with a universal milling head, rotating the universal milling head to enable the direction of a main shaft of the universal milling head to be consistent with the direction of the center of the threaded hole, aligning, installing a second milling cutter, and milling a center hole;
s5: and installing a thread milling cutter, aligning the zero point of the workpiece, and then milling the threaded hole.
2. A semi-enclosed space threading method according to claim 1, wherein: and the step of milling the threaded hole comprises rough milling and finish milling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810853.XA CN109047869B (en) | 2018-07-23 | 2018-07-23 | Semi-closed space thread machining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810853.XA CN109047869B (en) | 2018-07-23 | 2018-07-23 | Semi-closed space thread machining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109047869A CN109047869A (en) | 2018-12-21 |
| CN109047869B true CN109047869B (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810810853.XA Active CN109047869B (en) | 2018-07-23 | 2018-07-23 | Semi-closed space thread machining method |
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| CN (1) | CN109047869B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112589168B (en) * | 2020-12-02 | 2023-03-21 | 航天科工哈尔滨风华有限公司 | Method for machining inner cavity of special-shaped thin-wall cabin section |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9718154B2 (en) * | 2012-01-18 | 2017-08-01 | United Technologies Corporation | Slot machining |
| CN102554304A (en) * | 2012-02-17 | 2012-07-11 | 齐齐哈尔二机床(集团)有限责任公司 | Method for machining 45-degree intersected shaft holes of milling head |
| CN204963818U (en) * | 2015-06-10 | 2016-01-13 | 东莞市高鼎检测设备配件有限公司 | Reference sphere subassembly |
| CN204868360U (en) * | 2015-08-18 | 2015-12-16 | 西安优盛航空科技有限公司 | Quick tool setting device of omnipotent angle cutter head |
| DE102016117932B4 (en) * | 2016-09-22 | 2020-06-10 | Open Mind Technologies Ag | Process for the removal of material from rounding surfaces of a workpiece |
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| CN109047869A (en) | 2018-12-21 |
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