CN115237052A - Method for machining wavy die - Google Patents
Method for machining wavy die Download PDFInfo
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- CN115237052A CN115237052A CN202210892674.1A CN202210892674A CN115237052A CN 115237052 A CN115237052 A CN 115237052A CN 202210892674 A CN202210892674 A CN 202210892674A CN 115237052 A CN115237052 A CN 115237052A
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- guide
- processing
- curved surface
- guide surface
- cutter
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35349—Display part, programmed locus and tool path, traject, dynamic locus
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Numerical Control (AREA)
Abstract
The invention relates to a die forming process, in particular to a method for processing a wavy die, which comprises the steps of fitting and setting a tool position track; the fitting of the tool position track is set in a Cartesian space coordinate to be completed; the fitting setting of the tool position track is carried out by reasonably selecting a guide surface and a projection direction of a tool position, selecting a feeding mode and executing a processing sequence; when the guide surface and the projection direction are selected, the surface which is closest to the projection of the curved surface to be processed in the projection direction is selected as the guide surface; planning uniform guide points in the guide surface in the projection direction; feeding along a direction perpendicular to the main profile trend of the guide surface, and partitioning the free-form surface; the method has the advantages that the unscented and recyclable free-form curved surface is subjected to fitting in a breakthrough manner, so that the free-form curved surface can be accurately machined on a numerical control machine tool, and the problems of low grinding precision and low speed of manual control in the current industry are solved; the sand blasting strength is not high.
Description
Technical Field
The invention relates to a die forming process, in particular to a method for processing a wavy die.
Background
The curved surface die is generally finished by at least two procedures of rough machining and finish machining in the process of production and forming.
For tool path planning in a parametric space, the construction of a parametric surface is usually limited by the geometry of the workpiece. Because the requirement of the tool path generation algorithm for complete geometric information is difficult to meet in practice, particularly for an edited and irregular free-form surface, if a tool position track is obtained by a parameter line method, firstly, the curved surface reconstruction is required, and then the tool position track is planned on the basis of the reconstructed curved surface. For complex geometries this step is often difficult to achieve, so this method has less room for optimization; because the wavy surface belongs to a free-form surface, the trend rule of the wavy surface cannot be obtained, and the feed path cannot be obtained in a mathematical calculation mode.
Because the free-form surface can not obtain a model of the forming surface through a mathematical method, in the actual processing process, a blank with higher precision is mostly obtained through precision casting, then the surface is ground in a manual control mode, and finally the free-form surface is formed through sand blasting; the precision can not be guaranteed by manual control in the grinding process, the surface strength of the mold after sand blasting is not high, and the mold is easy to have defects after being used for a long time.
Disclosure of Invention
The invention aims to provide a method for processing a wavy die, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for processing a wavy die comprises the steps of fitting and setting a tool position track;
the fitting of the tool position track is set in a Cartesian space coordinate to be completed, and the tool position track is set according to the following steps;
the method comprises the following steps that firstly, a guide surface and a projection direction of a tool position are reasonably selected, and a surface which is closest to the projection of a curved surface to be processed in the projection direction is selected as the guide surface; planning uniform guide points in the guide surface in the projection direction;
step two, selecting a feed mode, and feeding along a direction perpendicular to the main profile trend of the guide surface; dividing the free-form surface into a plurality of bending areas and flat areas along a path perpendicular to the main profile trend of the guide surface according to the bending degree of the path;
step three, executing processing, namely outputting the coordinates of the guide points planned in the step one in a Cartesian space, and importing coordinate values in a numerical control panel; and selecting a bidirectional feed mode in the machining interface for machining, and starting a machine tool spindle.
The processing method of the wavy die comprises the following steps: in the second step, when the free curved surface is partitioned, the curved surface is partitioned according to an included angle between the normal direction of the curved surface and the axial direction of the cutter;
when the included angle between the two is too large or too small, the section is divided into a bending area; the included angle is approximately 90 deg., and is divided into flat areas.
The processing method of the wavy die comprises the following steps: in the first step, planned guide points are distributed discretely along the main profile trend of a guide surface; the main profile of the guide surface is a guide path; the discrete distribution density of the guide points in the guide path in the flat region is smaller than the discrete distribution density of the guide points in the curved region.
The processing method of the wavy die comprises the following steps: in the first step, the planned distance between two adjacent guide points is to cover the material residual thickness between the tool paths, and the geometric trend of the guide points on the guide path is referred to.
The processing method of the wavy die comprises the following steps: the included angle between the normal direction of the surface and the axial direction of the cutter is close to a flat area of 90 degrees, the height drop of the curved surface in the processing range is small, and bidirectional feed along the direction vertical to the main profile trend of the guide surface is adopted; when the surface processing quality is specially required, the processing is carried out by adopting a one-way feed mode.
The processing method of the wavy die comprises the following steps: the bidirectional feed is a feed mode of alternating forward milling and reverse milling, and the cutter adopts a ball cutter.
The processing method of the wavy die comprises the following steps: for a bending area with a large included angle between the normal direction of the surface and the axial direction of the cutter, if the height difference is small, a unidirectional upward feeding mode is adopted for processing; the feed direction should be along the steep slope direction, so that the cutting dead angle is reduced, and the tool position track approaches to a curved surface;
if the height drop is large, the layer cutting feed mode perpendicular to the axial direction of the cutter is adopted for processing, and the milling state of the cutter is improved.
Compared with the prior art, the invention has the beneficial effects that: the method has the advantages that the unscented and recyclable free-form curved surface is subjected to fitting in a breakthrough manner, so that the free-form curved surface can be accurately machined on a numerical control machine tool, and the problems of low grinding precision and low speed of manual control in the current industry are solved; the sand blasting strength is not high.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As an embodiment of the invention, the machining method of the wavy die comprises the steps of fitting and setting a tool position track;
the tool position track fitting setting is completed in a Cartesian space coordinate, and is specifically set according to the following steps;
the method comprises the following steps that firstly, a guide surface and a projection direction of a tool position are reasonably selected, and a surface which is closest to the projection of a curved surface to be processed in the projection direction is selected as the guide surface; planning uniform guide points in the guide surface in the projection direction;
step two, selecting a feed mode, feeding along a direction perpendicular to the main profile trend of the guide surface, and processing in an alternate mode of forward milling and reverse milling; the efficiency may result in longer processing cycle, but the cutter blank can be reduced; dividing the free-form surface into a plurality of bending areas and flat areas along a path perpendicular to the main profile trend of the guide surface according to the bending degree of the path; during feeding, if a bending area with large fall is encountered and the bending area cannot avoid, the feeding track is to convert the upward cutting into the upward cutting or adopt a laminar cutting method to feed; but frequent down cutting should be avoided; the feed along the direction vertical to the main profile trend of the guide surface can approach the real curved surface to the maximum extent, and the length of the tool path is reduced;
step three, executing processing, outputting the coordinates of the driving points planned in the step one in a Cartesian space, and importing coordinate values in a numerical control panel; selecting a bidirectional feed mode for processing in a processing interface; and opening the main shaft of the machine tool, and processing the blank clamped on the jig.
The method has the advantages that the unscented and recyclable free-form curved surface is subjected to fitting in a breakthrough manner, so that the free-form curved surface can be accurately machined on a numerical control machine tool, and the problems of low grinding precision and low speed of manual control in the current industry are solved; the sand blasting strength is not high.
As a further scheme of the invention, in the first step, planned guide points are distributed discretely along the main profile trend of the guide surface; the main profile of the guide surface is in a guide path; the flat section on the guide path can adaptively reduce the discrete distribution density of the guide points; and the bending section on the guide motion path can adaptively improve the discrete distribution density of the guide motion points.
The higher the discrete density of the guide points is, the closer the guide path is to the real profile trend of the die; the guide path of the flat section is regular, so that the discrete distribution density of the guide points can be adaptively reduced; on the contrary, the bending section can not be regularly circulated, so that the discrete distribution density of the active points is adaptively increased in order to better fit the real trend of the mold profile.
As a further scheme of the invention, in the step one, the distance between two adjacent planned guide points is set according to the material residual between the tool tracks, and the geometric trend of the guide points on the guide path is referred to; the cutter is a ball cutter.
Theoretically speaking, the distance between two adjacent guide points can only cover the material residual thickness between the tool paths; however, in the actual machining process, if a bent part exists, compensation cutting is required; therefore, when planning the guide points, the distance between two adjacent guide points also needs to consider the geometric trend of the surface of the mold; when the guide points are located at the geometric bending part, the distance between two adjacent guide points should be reduced to compensate the bending part of the tool trend.
It should be noted that the distance between the guiding points is not too small; although the smaller the distance between the guide points is, the higher the processing precision is, the closer the formed die is to the design; however, the distance between the guide points is too small, which inevitably increases the milling time.
As a further scheme of the present invention, in the second step, when the free curved surface is partitioned, the curved surface is partitioned according to an included angle between a normal direction of the curved surface and an axial direction of the cutter;
when the included angle between the two is too large or too small, the section is divided into a bending area; the included angle is approximately 90 deg., and is divided into flat areas.
In the practical application process, when the bending area and the flat area are divided by the included angle between the normal direction of the surface and the axial direction of the cutter, the specific setting can be comprehensively set according to the processing precision requirement, the specification and the size of the die to be processed and the cutting amount of the cutter.
The guide points are distributed on the guide surface, so the normal direction of the surface is equivalent to the moving direction of the curved surface on the guide surface, and the axial direction of the cutter is a mode of being vertical to the normal direction of the surface; specifically, when a certain tangent point on the guide motion path is reached, the normal direction at the point and the axial direction of the cutter actually form an included angle, and the included angle is probably not a right angle.
As a further scheme of the invention, in a flat area with an included angle close to 90 degrees between the normal direction of the surface and the axial direction of the cutter, because the height difference of the curved surface in the processing range is not large, bidirectional feed along the direction vertical to the main profile trend of the guide surface is adopted; of course, the surface processing quality has special requirements, and the processing can also be carried out by adopting a one-way feed mode.
As a further scheme of the invention, for a bending area with a large included angle between the normal direction of the surface and the axial direction of the cutter, if the height drop is small, a unidirectional upward feeding mode is adopted for processing; the feed direction should be along the steep slope direction to reduce the cutting dead angle and make the tool position track approach the curved surface better;
if the height difference is large, the layer cutting feed mode perpendicular to the axial direction of the cutter is adopted for processing so as to improve the milling state of the cutter.
The above embodiments are exemplary, not limiting, and the technical solutions that can implement the present invention in other specific forms without departing from the spirit or essential characteristics of the present invention are included in the present invention.
Claims (7)
1. A method for processing a wavy die is characterized by comprising the steps of fitting and setting a tool position track; the fitting of the tool position track is set in a Cartesian space coordinate to be completed, and the tool position track is set according to the following steps;
the method comprises the following steps that firstly, a guide surface and a projection direction of a cutter position are reasonably selected, and a surface which is closest to the projection of a curved surface to be processed in the projection direction is selected as the guide surface; planning uniform guide points in the guide surface in the projection direction;
step two, selecting a feed mode, and feeding along a direction perpendicular to the trend of the main profile of the guide surface; dividing the free-form surface into a plurality of bending areas and flat areas along a path perpendicular to the main profile trend of the guide surface according to the bending degree of the path;
step three, executing processing, namely outputting the coordinates of the guide points planned in the step one in a Cartesian space, and importing coordinate values in a numerical control panel; and selecting a bidirectional feed mode in the machining interface for machining, and starting a machine tool spindle.
2. The method for processing the wavy die as claimed in claim 1, wherein in the second step, when the free curved surface is partitioned, the curved surface is partitioned according to an included angle between a normal direction of the curved surface and an axial direction of the tool;
when the included angle between the two is too large or too small, the section is divided into a bending area; the included angle is approximately 90 deg., and is divided into flat areas.
3. The method for processing the wavy mold according to claim 2, wherein in the first step, planned guide points are distributed discretely along the main profile trend of the guide surface; the main profile of the guide surface is in a guide path; the discrete distribution density of the guide points in the guide path in the flat region is smaller than the discrete distribution density of the guide points in the curved region.
4. The method for processing the wavy mold according to claim 3, wherein in the first step, the planned distance between two adjacent guide points should cover the residual thickness of the material between the tool tracks, and the geometric orientation of the guide points on the guide path is referred to.
5. The method for processing the wavy die as claimed in claim 2, wherein the included angle between the normal direction of the surface and the axial direction of the tool is close to a flat area of 90 degrees, the height drop of the curved surface in the processing range is small, and bidirectional feed along the direction perpendicular to the main profile trend of the guide surface is adopted; when the surface processing quality is specially required, the processing is carried out by adopting a one-way feed mode.
6. The method for machining the wavy mold according to claim 5, wherein the bidirectional feed is a feed mode of alternating forward milling and backward milling, and the cutter is a ball cutter.
7. The method for processing the wavy mold according to claim 1, wherein for a bending area with a large included angle between the normal direction of the surface and the axial direction of the cutter, if the height difference is small, the processing is carried out in a one-way upward feeding mode; the feed direction should be along the steep slope direction, so that the cutting dead angle is reduced, and the tool position track approaches to a curved surface;
if the height drop is large, the layer cutting feed mode perpendicular to the axial direction of the cutter is adopted for processing, and the milling state of the cutter is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210892674.1A CN115237052A (en) | 2022-07-27 | 2022-07-27 | Method for machining wavy die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210892674.1A CN115237052A (en) | 2022-07-27 | 2022-07-27 | Method for machining wavy die |
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| Publication Number | Publication Date |
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| CN115237052A true CN115237052A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210892674.1A Pending CN115237052A (en) | 2022-07-27 | 2022-07-27 | Method for machining wavy die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116493873A (en) * | 2023-06-25 | 2023-07-28 | 深圳市锴诚精密模具有限公司 | Precise machining process for raised grains |
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2022
- 2022-07-27 CN CN202210892674.1A patent/CN115237052A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116493873A (en) * | 2023-06-25 | 2023-07-28 | 深圳市锴诚精密模具有限公司 | Precise machining process for raised grains |
| CN116493873B (en) * | 2023-06-25 | 2023-11-21 | 深圳市锴诚精密模具有限公司 | Precise machining process for raised grains |
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