CN109849545B - Numerical control heat transfer printing processing method - Google Patents
Numerical control heat transfer printing processing method Download PDFInfo
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- CN109849545B CN109849545B CN201811549826.8A CN201811549826A CN109849545B CN 109849545 B CN109849545 B CN 109849545B CN 201811549826 A CN201811549826 A CN 201811549826A CN 109849545 B CN109849545 B CN 109849545B
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- 238000010023 transfer printing Methods 0.000 title claims abstract description 33
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 50
- 238000007731 hot pressing Methods 0.000 claims description 14
- 238000003754 machining Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000008672 reprogramming Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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Abstract
The invention relates to a numerical control heat transfer printing processing method, which comprises the following steps: (1) obtaining a coordinate system origin, a processing starting point and a multi-axis mechanical control tool path through the geometric section profile of the workpiece to be processed; (2) installing a workpiece to be processed on a workbench; (3) rotating the position of the workpiece to be processed through an axis A for controlling the rotating position of the workpiece to be processed to enable the processing starting point and the origin of the coordinate system to be located in the same vertical plane; (4) the multi-shaft mechanical control tool path is used for controlling a Z shaft for controlling the vertical position of the hot stamping wheel and an A shaft for controlling the rotation position of the workpiece, so that the thermal transfer printing processing of the workpiece is carried out. By adopting the numerical control thermal transfer printing processing method, the processing quality is good, the processing capacity is high, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of numerical control processing, in particular to thermal transfer printing processing, and specifically relates to a numerical control thermal transfer printing processing method.
Background
The heat transfer printing process is one process of printing the pattern on the transfer printing film on the surface of product with heat transfer printing machine. The thermal transfer printer is the machine that completes the process.
Traditional heat transfer machine uses PLC to control the heat transfer machine motion, and when the rendition product needed the multiaxis linkage rendition, PLC system control precision was not enough, and the response is slower, and consequently movement track and ideal orbit deviation are great, and pressure is inhomogeneous between the gyro wheel of heat transfer machine and the processing product, leads to the processing product effect relatively poor. The transfer printing motion of the thermal printer is controlled by a numerical control system, so that the surface of a workpiece and a transfer printing film are uniformly stressed and the track control is accurate when the workpiece is processed for hot pressing, and the problems existing in PLC control are fully solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the numerical control thermal transfer printing processing method which is good in processing quality, high in processing capacity and wide in application range.
In order to achieve the above object, the present invention provides a numerical control thermal transfer processing method, wherein the method comprises the steps of:
(1) obtaining a coordinate system origin, a processing starting point and a multi-axis mechanical control tool path through the geometric section profile of the workpiece to be processed;
(2) installing a workpiece to be processed on a workbench;
(3) rotating the position of the workpiece to be processed through an axis A for controlling the rotating position of the workpiece to be processed to enable the processing starting point and the origin of the coordinate system to be located in the same vertical plane;
(4) the multi-shaft mechanical control tool path is used for controlling a Z shaft for controlling the vertical position of the hot stamping wheel and an A shaft for controlling the rotation position of the workpiece, so that the thermal transfer printing processing of the workpiece is carried out.
Preferably, the machining starting point in the step (1) is a point farthest from the workpiece origin in the workpiece surface or a maximum point locally distant from the workpiece in the workpiece surface.
Preferably, the step (1) is specifically:
(1-1) obtaining a given cutter path according to the geometric section profile of the workpiece to be machined;
(1-2) identifying a coordinate system origin and a machining starting point in the given tool path according to the given tool path;
(1-3) translating the given cutter path according to the identified coordinate system origin and the diameter of the hot stamping wheel to obtain a new cutter path track;
(1-4) offsetting the new cutting path track according to the diameter of the hot-pressing wheel and the depth value of the edge of the hot-pressing wheel extruded to the surface of the workpiece to obtain a control track;
and (1-5) outputting the multi-axis mechanical control tool path according to the control track.
Preferably, the steps (1-5) specifically include: discretizing the control track according to the equal length according to preset precision to obtain a point column PiLet the origin of the coordinate system be O, and Z and a for multi-axis mechanical control be:
P0is the point in the control trajectory corresponding to the starting point of the machining.
Preferably, when the workpiece to be processed is preset to rotate anticlockwise, the driving motor servo system sends a positive direction instruction to the axis A, and discretization of the control track obtains the dot matrix P clockwiseiData, a in multi-axis mechanical control tool pathiGradually increasing from 0 degrees to 360 degrees; when the workpiece to be processed is preset to rotate clockwise, the servo motor system is driven to send a negative direction instruction to the axis A, and the discretization of the control track obtains a dot matrix P anticlockwiseiData, a in multi-axis mechanical control tool pathiGradually decreasing from 0 to-360 degrees.
Preferably, the a-axis workpiece coordinate of the machining start point is set to 0, the Z-axis is gradually lowered so that the hot platen contacts the workpiece surface, and the Z-axis is further lowered so that the hot platen presses the workpiece surface, at which time the Z-axis workpiece coordinate is recorded as 0.
Preferably, the method further comprises:
and (5): and (5) lifting the Z axis, unloading the workpiece subjected to thermal transfer printing processing from the workbench, finishing the processing or continuing the thermal transfer printing processing of the next workpiece to be processed, and repeating the steps (2) - (5).
The numerical control heat transfer printing processing method has the beneficial effects that:
1) improvement in processing quality: the numerical control system is used for interpolating the instruction with the precision of 0.001mm, the actual processing effect is far beyond expectation, and compared with the original PLC system, the defect rate of the product is reduced by 8 percent from 11 percent, and the yield reaches 93 percent;
2) powerful processing capacity: the numerical control system provides high-efficiency image and file processing capacity, and especially when the used image is very complex, such as a plurality of straight lines connected with arcs and a large number of arcs, the processing speed and precision of the PLC are obviously reduced, and the PLC cannot meet the requirements of customers or cannot be identified by directly reporting errors; the excellent interactive system of the numerical control system greatly improves the use efficiency of users and saves time;
3) excellent shaft expansion capability: the updating period of the machine type is fast, the change is large, the numerical control system is convenient to switch, auxiliary shafts can be added according to the needs of users, the numerical control system is well compatible with the auxiliary shafts, multi-shaft linkage is realized, and the control is accurate; the original PLC system is complex in expansion auxiliary shaft, needs reprogramming and is uneven in speed control during multi-shaft linkage.
Drawings
FIG. 1 is a schematic structural diagram of a numerically controlled thermal transfer printing system according to the present invention.
FIG. 2 is a schematic diagram of a control track in the numerical control thermal transfer printing processing method of the present invention.
FIG. 3 is a schematic diagram of a multi-axis mechanical control tool path in the numerical control thermal transfer printing processing method of the present invention.
Detailed Description
In order that the technical contents of the present invention can be more clearly understood, the following further description is given of a specific embodiment of the present invention.
As shown in fig. 1 to 3, a cubic workpiece with a hexagonal cross-sectional profile is taken as an example to provide a specific embodiment of the numerical control thermal transfer printing processing method of the present invention, wherein, as shown in fig. 1, the numerical control thermal transfer printing processing system of the present invention includes a Z-axis for controlling the up-and-down movement of a thermal press wheel, a workbench, a workpiece to be processed mounted on the workbench, an a-axis for controlling the rotation of the workbench, a film with a pattern, a film feeding shaft, and a film collecting shaft, and the general working process is as follows: and (3) heating the hot-pressing wheel, starting the program, descending the Z axis and extruding the surface of the workpiece, linking ZA, conveying the film by the film conveying shaft, and collecting the film by the film collecting shaft. The Z axis drives a screw rod through a servo motor to enable a printing wheel of a processing part to move up and down; the A shaft is connected with a speed reducer through a servo motor to drive a workbench (the size of the die is smaller than that of a workpiece, and the workpiece is sleeved on the die to be fixed) to rotate.
The method comprises the following steps:
(1) obtaining a coordinate system origin, a processing starting point and a multi-axis mechanical control tool path through the geometric section profile of the workpiece to be processed;
(2) installing a workpiece to be processed on a workbench;
(3) rotating the position of the workpiece to be processed through an axis A for controlling the rotating position of the workpiece to be processed to enable the processing starting point and the origin of the coordinate system to be located in the same vertical plane;
(4) the multi-shaft mechanical control tool path controls a Z shaft for controlling the vertical position of the hot stamping wheel and an A shaft (ZA linkage) for controlling the rotation position of the workpiece, so as to carry out the hot transfer printing processing of the workpiece.
Wherein, the step (1) is specifically as follows:
identifying an original point and an initial point of a coordinate system appointed in a given tool path;
adjusting the cutter path sequence, and connecting the cutter paths end to end in a counterclockwise or clockwise direction;
designing a tool (hot stamping wheel) attitude model according to the machine tool structure;
converting the given tool path track into a control track according to the tool posture model;
outputting a multi-axis mechanical control tool path according to the control track;
the system sets the origin of the multi-axis workpiece; the numerical control system needs to set the original point of a workpiece, for the heat transfer printing processing of the ZA structure, a user needs to place the workpiece on a rotary workbench, control an A shaft to rotate the processing initial point of the workpiece to be in the same vertical plane with the center of a hot-pressing wheel, and record the coordinate of the workpiece of the A shaft as 0; then, the Z axis is gradually lowered so that the hot press wheel presses the surface of the workpiece, and the Z axis is further lowered to achieve a pressing effect at the time of machining (the height of the further lowering is referred to as a depth-down value), at which time the workpiece coordinate of the Z axis is recorded as 0.
The system loads the multi-shaft mechanical control tool path for processing.
In a preferred embodiment, in order to enable an operator to easily determine the zero point of the ZA structure workpiece coordinate when in use, the machining starting point in step (1) is a point on the workpiece surface farthest from the workpiece origin or a maximum point on the workpiece surface locally distant from the workpiece origin. Wherein, the origin of the coordinate system is the position of the central point of the circular arc with the diameter of 10mm in fig. 2, the processing starting point is the position of the central point of the circular arc with the diameter of 5mm, and the tracks in the given tool path are sequentially connected clockwise or anticlockwise from the starting point according to the actual mechanical assembly;
in a preferred embodiment, the step (1) is specifically:
(1-1) obtaining a given cutter path according to the geometric section profile of the workpiece to be machined;
(1-2) identifying a coordinate system origin and a machining starting point in the given tool path according to the given tool path;
(1-3) translating the given cutter path according to the identified coordinate system origin and the diameter of the hot stamping wheel to obtain a new cutter path track; the "new tool path trajectory" corresponds to the translation of the input geometry (given tool path) into the same coordinate system as the machine structure, the 10mm diameter circular arc in fig. 2 being the center of rotation in the machine structure.
(1-4) offsetting the new cutting path track according to the difference value of the radius of the hot-pressing wheel and the depth value of the edge of the hot-pressing wheel extruded to the surface of the workpiece to obtain a control track, and ensuring that the edge of the hot-pressing wheel can just press the depth value to extrude the surface of the workpiece when in actual processing (the hot-pressing wheel is elastic) on the control track;
the depth value of the pressing can be set by experience, the hot-pressing wheel can deform when pressing the hot-pressing film and the workpiece, namely the diameter becomes smaller, and therefore when debugging is carried out, the diameter of the wheel is changed, and the adjusted path is consistent with the expected path.
And (1-5) outputting the multi-axis mechanical control tool path according to the control track.
In a preferred embodiment, the steps (1-5) are specifically: discretizing the control track according to preset precision, such as equal length, to obtain a point column PiLet the origin of the coordinate system be O, and the Z and A (Z represents the distance from the origin of the Z-axis machine to the surface of the workpiece; A represents the rotation angle of the mold) of the multi-axis machine control are output as follows:
P0a point corresponding to the processing starting point in the control track is obtained; wherein,
representing a vector
To vector
The obtained angle, positive and negative, is determined according to the rotation direction of the workpiece during processing.
In a preferred embodiment, when the workpiece to be processed is preset to rotate anticlockwise, the servo system of the driving motor sends a positive direction command to the axis a, and discretization of the control track obtains the dot matrix P clockwiseiData, a in multi-axis mechanical control tool pathiGradually increasing from 0 degrees to 360 degrees; when the workpiece to be processed is preset to rotate clockwise, the servo motor system is driven to send a negative direction instruction to the axis A, and the discretization of the control track obtains a dot matrix P anticlockwiseiData, a in multi-axis mechanical control tool pathiGradually decreasing from 0 to-360 degrees.
In a preferred embodiment, the a-axis workpiece coordinate of the machining start point is set to 0, the Z-axis is gradually lowered so that the hot platen contacts the workpiece surface, and the Z-axis is further lowered so that the hot platen presses the workpiece surface, at which time the Z-axis workpiece coordinate is recorded as 0.
In a preferred embodiment, the method further comprises:
and (5): and (5) lifting the Z axis, unloading the workpiece subjected to thermal transfer printing processing from the workbench, finishing the processing or continuing the thermal transfer printing processing of the next workpiece to be processed, and repeating the steps (2) - (5). That is to say, in actual machining, the tool path generation and the workpiece coordinate zero clearing are only performed once, the hot pressing film is wound on the film feeding shaft, a plurality of workpieces can be machined, one workpiece is machined each time, the Z shaft can be lifted, the machined workpiece is dismounted, one workpiece to be machined is mounted, and then the numerical control system is clicked to start machining.
The method provided by the invention can realize local printing by drawing the local cutter path.
The numerical control heat transfer printing processing method has the beneficial effects that:
1) improvement in processing quality: the numerical control system is used for interpolating the instruction with the precision of 0.001mm, the actual processing effect is far beyond expectation, and compared with the original PLC system, the defect rate of the product is reduced by 8 percent from 11 percent, and the yield reaches 93 percent;
2) powerful processing capacity: the numerical control system provides high-efficiency image and file processing capacity, and especially when the used image is very complex, such as a plurality of straight lines connected with arcs and a large number of arcs, the processing speed and precision of the PLC are obviously reduced, and the PLC cannot meet the requirements of customers or cannot be identified by directly reporting errors; the excellent interactive system of the numerical control system greatly improves the use efficiency of users and saves time;
3) excellent shaft expansion capability: the updating period of the machine type is fast, the change is large, the numerical control system is convenient to switch, auxiliary shafts can be added according to the needs of users, the numerical control system is well compatible with the auxiliary shafts, multi-shaft linkage is realized, and the control is accurate; the original PLC system is complex in expansion auxiliary shaft, needs reprogramming and is uneven in speed control during multi-shaft linkage.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (5)
1. A numerical control heat transfer printing processing method is characterized by comprising the following steps:
(1) obtaining a coordinate system origin, a processing starting point and a multi-axis mechanical control tool path through the geometric section profile of the workpiece to be processed;
(2) installing a workpiece to be processed on a workbench;
(3) rotating the position of the workpiece to be processed through an axis A for controlling the rotating position of the workpiece to be processed to enable the processing starting point and the origin of the coordinate system to be located in the same vertical plane;
(4) controlling a Z axis for controlling the upper and lower positions of a hot stamping wheel and an A axis for controlling the rotation position of a workpiece through the multi-axis mechanical control tool path to perform thermal transfer printing processing on the workpiece;
the step (1) is specifically as follows:
(1-1) obtaining a given cutter path according to the geometric section profile of the workpiece to be machined;
(1-2) identifying a coordinate system origin and a machining starting point in the given tool path according to the given tool path;
(1-3) translating the given cutter path according to the identified coordinate system origin and the diameter of the hot stamping wheel to obtain a new cutter path track;
(1-4) offsetting the new cutting path track according to the radius of the hot-pressing wheel and the depth value of the edge of the hot-pressing wheel extruded to the surface of the workpiece to obtain a control track;
(1-5) outputting the multi-axis mechanical control tool path according to the control track;
the steps (1-5) are specifically as follows: discretizing the control track according to the equal length according to preset precision to obtain a point column PiLet the origin of the coordinate system be O, and Z and a for multi-axis mechanical control be:
P0is the point in the control trajectory corresponding to the starting point of the machining.
2. The numerical control thermal transfer printing processing method according to claim 1, wherein the processing start point in the step (1) is a point farthest from the workpiece origin point in the workpiece surface or a maximum point locally distant from the workpiece origin point in the workpiece surface.
3. The method according to claim 1, wherein when the workpiece to be processed is rotated counterclockwise in advance, the servo system of the driving motor sends a forward direction command to the axis a, and the discretization of the control trajectory obtains a dot matrix P clockwiseiData, a in multi-axis mechanical control tool pathiGradually increasing from 0 degrees to 360 degrees; when the workpiece to be processed is preset to rotate clockwise, the servo motor system is driven to send a negative direction instruction to the axis A, and the discretization of the control track obtains a dot matrix P anticlockwiseiData, a in multi-axis mechanical control tool pathiGradually decreasing from 0 to-360 degrees.
4. The numerical control thermal transfer processing method according to claim 1, wherein the a-axis workpiece coordinate of the processing start point is set to 0, the Z-axis is gradually lowered so that the hot platen contacts the workpiece surface, and the Z-axis is further lowered so that the hot platen presses the workpiece surface, at which time the Z-axis workpiece coordinate is recorded as 0.
5. The digitally controlled thermal transfer printing process of claim 1, further comprising:
and (5): and (5) lifting the Z axis, unloading the workpiece subjected to the thermal transfer printing processing from the workbench, finishing the processing or continuing the thermal transfer printing processing of the next workpiece to be processed, and repeating the steps (2) to (5).
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2018
- 2018-12-18 CN CN201811549826.8A patent/CN109849545B/en active Active
Patent Citations (9)
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|---|---|---|---|---|
| EP0426202A1 (en) * | 1984-08-20 | 1991-05-08 | Dai Nippon Insatsu Kabushiki Kaisha | Heat transfer sheet |
| JPH09277706A (en) * | 1996-04-15 | 1997-10-28 | Victor Co Of Japan Ltd | Thermal transfer printing method, thermal transfer printing apparatus, and, ink ribbon used therefor |
| CN101088681A (en) * | 2006-06-15 | 2007-12-19 | 东芝机械株式会社 | Precision roll turning lathe |
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