CN111722584A - Fast knife servo system, electric carving system and electric carving control method - Google Patents
Fast knife servo system, electric carving system and electric carving control method Download PDFInfo
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- CN111722584A CN111722584A CN202010468884.9A CN202010468884A CN111722584A CN 111722584 A CN111722584 A CN 111722584A CN 202010468884 A CN202010468884 A CN 202010468884A CN 111722584 A CN111722584 A CN 111722584A
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- 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
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- G—PHYSICS
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- 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
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- G05B2219/33218—Motor encoders, resolvers on common bus with drives, servo controllers
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Abstract
The invention relates to a fast knife servo system, an electric carving system and an electric carving control method, wherein the fast knife servo system comprises: an engraving head; the moving unit is used for driving the engraving head to move along the axial direction of the printing roller; the auxiliary movement mechanism is used for driving the engraving head to move along a cylindrical surface vertical to the printing roller; a control system, comprising: a moving unit driving module for driving the moving unit; the engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller; the auxiliary motion mechanism driving module is used for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point, and the moving distance is smaller than the pit depth of the engraving starting point; and the engraving head is also used for driving the engraving head to move towards the direction far away from the plate roller after the engraving head responds to enter a stable state. According to the invention, through the matching of the engraving head driving module and the auxiliary motion table, the size of the mesh point of the engraving starting point can be ensured to be consistent with the design size.
Description
Technical Field
The invention relates to the processing of workpieces, in particular to a fast knife servo system, an electric carving system and an electric carving control method.
Background
With the development of modern society, people have higher and higher requirements on printing quality, and a plate roller is a key factor influencing the quality of the plate roller. The roll format includes relief, flat and intaglio, wherein intaglio dominates the market with its excellent properties. The gravure platemaking method comprises the following steps: etching, laser engraving, electric engraving and the like. The electric carving plate-making method is developed in the last 50 years, and has the following advantages: 1. the repeatability is strong; 2. the area and the depth of the mesh points are variable, and a printed matter with rich color layers, clear outline, strong stereoscopic impression and strong texture can be printed; 3. low cost (meeting the premise of certain yield). Therefore, electroengraving plate making is still the most widely used plate making method. At present, the most advanced foreign engraving head for the electric engraving plate-making can reach 12000Hz, and the processing precision can reach several microns.
One of the key technologies for electroengraving is the control of the engraving head, the performance of which has a decisive influence on the printing quality. The carving head is an electro-mechanical conversion device capable of outputting high-frequency reciprocating motion, and the basic principle of the carving head is that a cutter bar is driven by means of Lorentz force to drive a diamond cutter point to cut into a copper layer on the surface of a roller, meanwhile, a high-rigidity spring is used for providing restoring force of the cutter bar, and magnetic fluid is used for attenuating residual vibration. For an engraving head with a motion amplitude of +/-50 μm and a processing frequency of 12000Hz, the maximum speed is 3.77m/s and the maximum acceleration is 28424G. The technology of high-speed high-precision gravure electroengraving machine has been known from a few companies in developed countries such as germany, the united states and japan. The control of the high-speed high-precision structure has important significance for realizing breakthrough of key parts in the manufacturing industry.
The inventors have found in practice that the first point at which the engraving head starts engraving, known as the starting point, tends to be smaller than the design size.
Disclosure of Invention
Therefore, it is necessary to provide a fast knife servo system, an electric engraving system and an electric engraving control method for solving the problem that the size of the engraving starting point is smaller than the design size.
A fast knife servo system, comprising: an engraving head; the moving unit is used for driving the engraving head to move along the axial direction of the printing roller; the auxiliary movement mechanism is used for driving the engraving head to move along a cylindrical surface vertical to the printing roller; a control system, comprising: a moving unit driving module for driving the moving unit; the engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller; the auxiliary motion mechanism driving module is used for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point, and the moving distance is smaller than the pit depth of the engraving starting point; and the engraving head is also used for driving the engraving head to move towards the direction far away from the plate roller after the engraving head responds to enter a stable state.
In one embodiment, the printing plate roller further comprises a spindle module, wherein the spindle module comprises a spindle and a spindle power unit, and the spindle power unit is used for driving the printing plate roller to rotate through the spindle.
In one embodiment, the plate roller engraving device further comprises a head rest module, wherein the head rest module comprises a head rest motor and a head rest, and the head rest motor is used for driving the head rest to press the tool tip of the engraving head on the surface of the plate roller.
In one embodiment, the auxiliary motion mechanism comprises a piezoelectric motor driven or voice coil motor driven motion stage.
In one embodiment, the auxiliary motion mechanism driving module drives the engraving head to move in a direction close to the plate roller by a distance before the engraving head starts engraving the engraving starting point, and the distance for driving the engraving head to move in a direction away from the plate roller after the engraving head responds to enter a stable state.
In one embodiment, the engraving head driving module outputs an engraving head instruction to drive a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller, the engraving head instruction includes a direct current instruction and an alternating current instruction, the direct current instruction is used for determining the depth of a cell engraved on the surface of the printing roller by the engraving head, and the alternating current instruction is used for determining the cycle of the reciprocating motion of the tool tip of the engraving head perpendicular to the cylindrical surface of the printing roller.
In one embodiment, the auxiliary motion mechanism driving module is further configured to drive the engraving head to move towards the engraving head moving direction corresponding to the sudden change in advance when the amplitude of the direct current command suddenly changes.
An electroengraving system, comprising: an engraving head; the moving unit is used for driving the engraving head to move along the axial direction of the printing roller; the auxiliary movement mechanism is used for driving the engraving head to move along a cylindrical surface vertical to the printing roller; a control system, comprising: a moving unit driving module for driving the moving unit; the engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller; the auxiliary motion mechanism driving module is used for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave an engraving starting point; and the engraving head is also used for driving the engraving head to move towards the direction far away from the plate roller after the engraving head responds to enter a stable state.
In one embodiment, the printing plate roller further comprises a spindle module, wherein the spindle module comprises a spindle and a spindle power unit, and the spindle power unit is used for driving the printing plate roller to rotate through the spindle.
In one embodiment, the plate roller engraving device further comprises a head rest module, wherein the head rest module comprises a head rest motor and a head rest, and the head rest motor is used for driving the head rest to press the tool tip of the engraving head on the surface of the plate roller.
In one embodiment, the auxiliary motion mechanism comprises a piezoelectric motor driven or voice coil motor driven motion stage.
In one embodiment, the auxiliary motion mechanism driving module drives the engraving head to move in a direction close to the plate roller by a distance before the engraving head starts engraving the engraving starting point, and the distance for driving the engraving head to move in a direction away from the plate roller after the engraving head responds to enter a stable state.
In one embodiment, the engraving head driving module outputs an engraving head instruction to drive a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller, the engraving head instruction includes a direct current instruction and an alternating current instruction, the direct current instruction is used for determining the depth of a cell engraved on the surface of the printing roller by the engraving head, and the alternating current instruction is used for determining the cycle of the reciprocating motion of the tool tip of the engraving head perpendicular to the cylindrical surface of the printing roller.
In one embodiment, the auxiliary motion mechanism driving module is further configured to drive the engraving head to move towards the engraving head moving direction corresponding to the sudden change in advance when the amplitude of the direct current command suddenly changes.
An electric carving control method comprises the following steps: before the engraving head driving module drives the engraving head to start engraving the engraving starting point, the auxiliary motion mechanism moves the engraving head to a direction close to the plate roller, and the moving distance is smaller than the hole depth of the engraving starting point; the engraving head driving module drives a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller so as to engrave a mesh; after the response of the engraving head enters a stable state, the auxiliary motion mechanism moves the engraving head to a direction far away from the plate roller; and the moving unit drives the engraving head to move along the axial direction of the plate roller.
In one embodiment, the method further comprises the step of driving the plate roller to rotate through the main shaft.
In one embodiment, the method further comprises the step of pressing the tip of the engraving head against the surface of the plate roll by the backup.
In one embodiment, distance c1 is equal to distance c 2.
In one embodiment, the method further includes, when the amplitude of the dc command of the engraving head command changes suddenly, the auxiliary motion mechanism drives the engraving head to move in the moving direction of the engraving head corresponding to the sudden direct current command in advance of the sudden change, and the moving distance d1 is smaller than the pit depth of the pit corresponding to the amplitude of the sudden change direct current command.
In one embodiment, the method further comprises the step of moving the engraving head to move a distance d2 away from the plate roller by the auxiliary motion mechanism after the engraving head responds to enter the stable state, so that the displacement compensation is cancelled.
In one embodiment, distance d1 is equal to distance d 2.
The fast knife servo system, the electric carving system and the electric carving control method are provided with the auxiliary motion mechanism independent of the moving unit and the carving head driving module, the carving head is positioned to a position closer to the plate roller in advance before the carving starting point is carved through the auxiliary motion mechanism, and the problems of untimely response and untimely position due to the fact that the carving head driving module drives the carving head to lag are compensated. And when the response of the engraving head enters a stable state, the engraving head is retreated through the auxiliary motion mechanism to cancel the displacement compensation. Through the cooperation of carving head drive module and auxiliary motion platform, guarantee that the cell size of starting carving point can be unanimous with the design size.
Drawings
For a better understanding of the description and/or illustration of embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the drawings. The additional details or examples used to describe the figures should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and/or examples, and the presently understood best modes of these inventions.
FIG. 1 is a schematic diagram of an exemplary electrographic machine configuration;
FIG. 2 is a schematic representation of the command and DC components of the engraving head, and the corresponding cells of the surface finish of the plate roll;
FIG. 3 is a timing diagram of an exemplary engraving head command at an engraving initiation point and a corresponding engraving head response;
FIG. 4 is a schematic diagram of a portion of a mechanical mechanism shared by the fast knife servo system and the electric engraving system in one embodiment;
fig. 5 is a timing sequence diagram of a direct current command of the engraving head at the engraving starting point and a corresponding driving command for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point by the driving module of the auxiliary motion mechanism;
FIG. 6 is a flowchart illustrating an exemplary method for controlling an electrographic process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only. When an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it can be directly on, adjacent to, connected or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
FIG. 1 is a schematic diagram of an exemplary electrographic machine configuration. When the electric carving machine works normally, the main shaft of the electric carving machine drives the printing roller to rotate at a high speed under the driving of the alternating-current servo motor, the carving head is pressed on the surface of the printing roller driven by the main shaft under the driving of the head leaning motor, and the trolley drives the carving head to move continuously at a low speed or move along the axial direction of the printing roller in a stepping mode under the driving of the screw rod of the servo motor. The industrial personal computer in the electric carving control system converts the patterns to be processed by the electric carving machine into digital image information, the carving head driving module converts the digital signals into analog signals through the digital-to-analog converter, and the carving head is controlled to carve carving points (net holes) with different sizes and depths on the surface of the plate roller copper layer at fixed frequency (4K-8 KHz).
The principle that the auxiliary encoder (auxiliary encoder) of the electric carving machine measures the position of the plate roller is as follows: the encoder includes two stacked gratings (e.g., a grating code disc and a grating aperture) that generate moire signals that move synchronously when the two gratings move relative to each other. That is, the grating code disc will rotate with the plate roller, and the relative movement of the black and white lines on the grating code disc will generate an optical signal with periodic light intensity, which is converted into two sine electrical signals with 90-degree phase difference (the two sine electrical signals with 90-degree phase difference are called sine and cosine signals). The sinusoidal electric signals are processed in a series, for example, by a quadruple frequency technology, so that the displacement measurement resolution can be obtained to be one fourth of the grating pitch, and the frequency-doubled electric signals are counted to realize displacement measurement.
The command of the engraving head is divided into two parts: direct current commands and alternating current commands. Referring to fig. 2, the direct current command determines the depth of the mesh opening engraved by the engraving head on the surface of the plate roller, and the alternating current command drives the engraving head to reciprocate and continuously engrave.
However, the engraving head works in an open-loop mode without feedback control, and meanwhile, due to the factors of relatively large response time, delayed response and the like of an electromechanical system, the step signal cannot be tracked in time, and the tracking effect is as shown in fig. 3.
The present application provides a Fast Tool Servo (Fast Tool Servo) system. The fast tool servo typically breaks the complex surface being machined down into a surface of revolution and a microstructure on the surface, which are then superimposed. The X-axis and Z-axis feed realizes the track motion of the rotary surface, and only position detection is carried out on the lathe spindle and track control is not carried out. The tool is driven by redundant motion axes mounted on the Z axis but independent of the lathe numerical control system to complete the Z axis motion required for turning the microstructure surface. The fast knife servo system has the characteristics of high frequency response, high rigidity and high positioning precision.
Referring to fig. 4, a fast tool servo system in an embodiment of the present application includes an engraving head, a moving unit, an auxiliary moving mechanism, and a control system (not shown in fig. 4). The moving unit is used for driving the engraving head to move along the axial direction of the plate roller. The auxiliary movement mechanism is used for driving the engraving head to move along the cylindrical surface vertical to the printing roller. The control system comprises a mobile unit driving module, an engraving head driving module and an auxiliary motion mechanism driving module. The engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller so as to engrave engraving points with different sizes and depths on the surface of the copper layer of the printing roller. The moving unit driving module is used for driving the moving unit to drive the engraving head to move continuously at a low speed or move along the axial direction of the plate roller in a stepping mode. The auxiliary motion mechanism driving module is used for driving the engraving head to move a distance a1 towards the direction close to the plate roller before the engraving head starts to engrave an engraving starting point (namely the first point at which the engraving head starts to engrave), and a1 is smaller than the depth of a hole of the engraving starting point; the auxiliary motion mechanism drive module is further configured to drive the engraving head to move a distance a2 away from the plate roll after the engraving head has entered a steady state in response.
The fast knife servo system is provided with an auxiliary motion mechanism independent of the moving unit and the engraving head driving module, the engraving head is positioned to a position closer to the plate roller in advance before the engraving starting point is engraved through the auxiliary motion mechanism, and the problems of untimely response and untimely position due to the fact that the engraving head driving module drives the engraving head to lag are compensated. And when the response of the engraving head enters a stable state, the engraving head is retreated through the auxiliary motion mechanism to cancel the displacement compensation. Through the cooperation of carving head drive module and auxiliary motion platform, guarantee that the cell size of starting carving point can be unanimous with the design size.
In one embodiment, the fast knife servo system further comprises a spindle module. The main shaft module comprises a main shaft and a main shaft power unit, and the main shaft power unit is used for driving the printing roller to rotate through the main shaft.
In one embodiment, the fast knife servo system further comprises a head rest module. The head leaning module comprises a head leaning motor and a head leaning, and the head leaning motor is used for driving the head leaning to press the tool tip of the engraving head on the surface of the printing roller.
In one embodiment, the auxiliary motion mechanism requires an electromechanical system with a relatively fast response speed, such as a piezoelectric motor driven motion stage or a voice coil motor driven motion stage. In one embodiment, the auxiliary motion mechanism is a piezoelectric motor driven or voice coil motor driven high speed high acceleration micro motion stage.
In one embodiment, the stroke of the auxiliary motion mechanism is 0.1-0.2 mm, and further can be about 0.15 mm.
In one embodiment, the engraving head driving module outputs an engraving head command to drive the tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller, the engraving head command comprises a direct current command and an alternating current command, the direct current command is used for determining the depth of the mesh engraved on the surface of the printing roller by the engraving head, and the alternating current command determines the period of the reciprocating motion of the tool tip of the engraving head perpendicular to the cylindrical surface of the printing roller. Fig. 5 is a timing diagram of a direct current command of the engraving head at the engraving starting point and a corresponding driving command of the auxiliary motion mechanism driving module for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point.
In one embodiment, distance a1 is equal to distance a2 (where a1 is equal to a2 means that the absolute value of the distance is equal), i.e., the auxiliary moving mechanism is retracted to the initial position after the engraving head has entered a steady state response (i.e., the position of the tip of the engraving head in the direction perpendicular to the cylindrical surface of the plate roll is followed by the magnitude of the dc command in the engraving head command).
In one embodiment, the auxiliary motion mechanism driving module is further configured to, when the amplitude of the dc command changes suddenly, drive the engraving head to move in the moving direction of the engraving head corresponding to the sudden change of the dc command in advance, where the moving distance b1 is smaller than the hole depth of the cell corresponding to the amplitude of the sudden change of the dc command; and after the response of the engraving head enters a stable state, the engraving head is driven to move a distance b2 in a direction away from the plate roller, so that the displacement compensation is cancelled. Under the drive of different direct current input instructions, especially when sudden change is caused by direct current instruction switching, the size of the network cell is ensured to be consistent with the design size. In one embodiment, b1 ═ b2 (meaning that the absolute values of the distances are equal).
In one embodiment, the magnitude and timing of the drive commands for the auxiliary motion mechanism may be calculated by dynamically modeling the knife servo and then based on the dynamic model.
In one embodiment, the magnitude and timing of the drive commands for the auxiliary motion mechanism may be set empirically by the manufacturer of the knife servo system. In another embodiment, the system can also be opened for the user of the fast knife servo system to set by himself, so as to try to find out the optimal parameters.
The present application further provides an electric engraving system, also referring to fig. 4, including an engraving head, a moving unit, an auxiliary motion mechanism, and a control system (not shown in fig. 4). The moving unit is used for driving the engraving head to move along the axial direction of the plate roller. The auxiliary movement mechanism is used for driving the engraving head to move along the cylindrical surface vertical to the printing roller. The control system comprises a mobile unit driving module, an engraving head driving module and an auxiliary motion mechanism driving module. The engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller so as to engrave engraving points with different sizes and depths on the surface of the copper layer of the printing roller. The moving unit driving module is used for driving the moving unit to drive the engraving head to move continuously at a low speed or move along the axial direction of the plate roller in a stepping mode. The auxiliary motion mechanism driving module is used for driving the engraving head to move to a distance c1 in a direction close to the plate roller before the engraving head starts to engrave an engraving starting point (namely, the first point at which the engraving head starts to engrave), and c1 is smaller than the depth of a hole of the engraving starting point; the motion assist mechanism drive module is further configured to drive the engraving head a distance c2 away from the plate roll after the engraving head has entered a steady state response.
The electric carving system is provided with the auxiliary motion mechanism independent of the moving unit and the carving head driving module, the carving head is positioned to a position closer to the plate roller in advance before the carving point begins to be carved through the auxiliary motion mechanism, and the problems of untimely response and untimely position due to the fact that the carving head driving module drives the carving head to lag are compensated. And when the response of the engraving head enters a stable state, the engraving head is retreated through the auxiliary motion mechanism to cancel the displacement compensation. Through the cooperation of carving head drive module and auxiliary motion platform, guarantee that the cell size of starting carving point can be unanimous with the design size.
In one embodiment, the electroengraving system further comprises a spindle module. The main shaft module comprises a main shaft and a main shaft power unit, and the main shaft power unit is used for driving the printing roller to rotate through the main shaft.
In one embodiment, the electroengraving system further comprises a head rest module. The head leaning module comprises a head leaning motor and a head leaning, and the head leaning motor is used for driving the head leaning to press the tool tip of the engraving head on the surface of the printing roller.
In one embodiment, the auxiliary motion mechanism requires an electromechanical system with a relatively fast response speed, such as a piezoelectric motor driven motion stage or a voice coil motor driven motion stage. In one embodiment, the auxiliary motion mechanism is a piezoelectric motor driven or voice coil motor driven high speed high acceleration micro motion stage.
In one embodiment, the stroke of the auxiliary motion mechanism is 0.1-0.2 mm, and further can be about 0.15 mm.
In one embodiment, the engraving head driving module outputs an engraving head command to drive the tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller, the engraving head command comprises a direct current command and an alternating current command, the direct current command is used for determining the depth of the mesh engraved on the surface of the printing roller by the engraving head, and the alternating current command determines the period of the reciprocating motion of the tool tip of the engraving head perpendicular to the cylindrical surface of the printing roller. Fig. 5 is a timing diagram of a direct current command of the engraving head at the engraving starting point and a corresponding driving command of the auxiliary motion mechanism driving module for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point.
In one embodiment, distance c1 is equal to distance c2 (where c1 is equal to c2 means that the absolute value of the distance is equal), i.e., the auxiliary moving mechanism is retracted to the initial position after the engraving head has entered a steady state response (i.e., the position of the tip of the engraving head in the direction perpendicular to the cylindrical surface of the plate roll is followed by the magnitude of the dc command in the engraving head command).
In one embodiment, the auxiliary motion mechanism driving module is further configured to, when the amplitude of the dc command changes suddenly, drive the engraving head to move in the moving direction of the engraving head corresponding to the sudden change of the dc command in advance, where the moving distance d1 is smaller than the hole depth of the cell corresponding to the amplitude of the sudden change of the dc command; and after the response of the engraving head enters a stable state, the engraving head is driven to move a distance d2 in a direction away from the plate roller, so that the displacement compensation is cancelled. Under the drive of different direct current input instructions, especially when sudden change is caused by direct current instruction switching, the size of the network cell is ensured to be consistent with the design size. In one embodiment, d1 ═ d2 (meaning that the absolute values of the distances are equal).
In one embodiment, the magnitude and timing of the drive commands for the auxiliary motion mechanism may be calculated by dynamically modeling the electroengraving system and then based on the dynamic model.
In one embodiment, the magnitude and timing of the driving command for the auxiliary moving mechanism can be set empirically by the manufacturer of the electrographic system. In another embodiment, the system can also be opened for the user of the engraving system to set by himself, so as to try and make the optimal parameters.
The application also provides an electric carving control method. FIG. 6 is a flowchart illustrating an exemplary method for controlling an electrographic marking, comprising:
s610, the auxiliary motion mechanism moves the engraving head to the direction close to the plate roller before the engraving head starts to engrave the engraving starting point.
And the auxiliary motion mechanism moves the engraving head to a distance c1 in the direction close to the plate roller before the engraving head driving module drives the engraving head to start engraving the engraving starting point, and c1 is smaller than the hole depth of the engraving starting point.
And S620, the engraving head driving module drives the tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the plate roller so as to engrave the mesh.
In one embodiment, the engraving head driving module outputs an engraving head instruction to drive the tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller, so as to engrave engraving points with different sizes and depths on the surface of the copper layer of the printing roller. The engraving head instruction comprises a direct current instruction and an alternating current instruction, the direct current instruction is used for determining the depth of a mesh opening engraved by the engraving head on the surface of the plate roller, and the alternating current instruction determines the period of reciprocating motion of a tool nose of the engraving head perpendicular to the cylindrical surface of the plate roller. Fig. 5 is a timing diagram of a direct current command of the engraving head at the engraving starting point and a corresponding driving command of the driving module of the auxiliary motion mechanism for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point.
And S630, after the response of the engraving head enters a stable state, the auxiliary motion mechanism moves the engraving head to a direction away from the plate roller.
The response of the engraving head to enter a stable state means that the position of the tool tip of the engraving head in the direction vertical to the cylindrical surface of the plate roller follows the amplitude of the direct current instruction in the engraving head instruction.
And S640, driving the engraving head to move along the axial direction of the plate roller by the moving unit.
The moving unit drives the engraving head to move continuously at a low speed or in a stepping mode along the axial direction of the plate roller. The moving speed of the moving unit in the axial direction of the plate roll is determined by the pattern to be processed by the electric engraving machine, and the moving of the moving unit in the axial direction of the plate roll is performed in synchronization with the reciprocating motion of the engraving head perpendicular to the cylindrical surface of the plate roll, so that step S640 is not necessarily performed after step S610, step S620, or step S630.
According to the electric carving control method, the carving head is positioned to a position closer to the plate roller in advance before the carving starting point begins to be carved through the auxiliary motion mechanism, and the problems of untimely response and short position due to the fact that the carving head driving module drives the carving head to lag are compensated. And when the response of the engraving head enters a stable state, the engraving head is retreated through the auxiliary motion mechanism to cancel the displacement compensation. Through the cooperation of carving head drive module and auxiliary motion platform, guarantee that the cell size of starting carving point can be unanimous with the design size.
In one embodiment, the method for controlling electroengraving further comprises the step of driving the plate roller to rotate through the main shaft.
In one embodiment, the method for controlling electroengraving further comprises the step of pressing the tip of the engraving head against the surface of the plate roll by means of the master.
In one embodiment, distance c1 is equal to distance c2 (where c1 is equal to c2 means that the absolute value of the distance is equal), i.e., the motion assist mechanism is retracted to the initial position after the engraving head has entered a steady state response.
In an embodiment, the method for controlling electric engraving further includes, when the amplitude of the dc command of the engraving head command suddenly changes, the auxiliary motion mechanism drives the engraving head to move in the moving direction of the engraving head corresponding to the suddenly changed dc command in advance, and the moving distance d1 is smaller than the pit depth of the pit corresponding to the amplitude of the suddenly changed dc command. The electric carving control method further comprises the step that after the carving head responds to enter the stable state, the auxiliary motion mechanism drives the carving head to move a distance d2 in the direction far away from the plate roller, and therefore displacement compensation is cancelled. Under the drive of different direct current input instructions, especially when sudden change is caused by direct current instruction switching, the size of the network cell is ensured to be consistent with the design size. In one embodiment, d1 ═ d2 (meaning that the absolute values of the distances are equal).
It should be understood that, although the steps in the flowchart of fig. 6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fast knife servo system, comprising:
an engraving head;
the moving unit is used for driving the engraving head to move along the axial direction of the printing roller;
the auxiliary movement mechanism is used for driving the engraving head to move along a cylindrical surface vertical to the printing roller;
a control system, comprising:
a moving unit driving module for driving the moving unit;
the engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller;
the auxiliary motion mechanism driving module is used for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave the engraving starting point, and the moving distance is smaller than the pit depth of the engraving starting point; and the engraving head is also used for driving the engraving head to move towards the direction far away from the plate roller after the engraving head responds to enter a stable state.
2. The fast knife servo system of claim 1 further comprising a spindle module, the spindle module comprising a spindle and a spindle power unit, the spindle power unit configured to rotate the plate roller via the spindle.
3. The knife servo system of claim 1, further comprising a head rest module, wherein the head rest module comprises a head rest motor and a head rest, and the head rest motor is configured to drive the head rest to press the tip of the engraving head against the surface of the plate roller.
4. The fast knife servo system of claim 1 wherein the auxiliary motion mechanism comprises a piezoelectric motor driven or voice coil motor driven motion stage.
5. The fast knife servo system of claim 1 wherein the auxiliary motion mechanism drive module drives the engraving head to move closer to the plate roller a distance before the engraving head begins to engrave the engraving point equal to a distance driving the engraving head to move away from the plate roller after the engraving head enters a steady state response.
6. The fast knife servo system of claim 1, wherein the engraving head driving module drives the knife tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller by outputting an engraving head command, the engraving head command comprises a direct current command and an alternating current command, the direct current command is used for determining the depth of the mesh opening engraved on the surface of the printing roller by the engraving head, and the alternating current command is used for determining the cycle of the reciprocating motion of the knife tip of the engraving head perpendicular to the cylindrical surface of the printing roller.
7. The fast knife servo system of claim 6, wherein the auxiliary motion mechanism driving module is further configured to drive the engraving head to move towards the engraving head moving direction corresponding to the abrupt change in advance of the abrupt change when the amplitude of the direct current command abruptly changes.
8. An electric carving system, comprising:
an engraving head;
the moving unit is used for driving the engraving head to move along the axial direction of the printing roller;
the auxiliary movement mechanism is used for driving the engraving head to move along a cylindrical surface vertical to the printing roller;
a control system, comprising:
a moving unit driving module for driving the moving unit;
the engraving head driving module is used for driving a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller;
the auxiliary motion mechanism driving module is used for driving the engraving head to move towards the direction close to the plate roller before the engraving head starts to engrave an engraving starting point; and the engraving head is also used for driving the engraving head to move towards the direction far away from the plate roller after the engraving head responds to enter a stable state.
9. An electric carving control method comprises the following steps:
before the engraving head driving module drives the engraving head to start engraving the engraving starting point, the auxiliary motion mechanism moves the engraving head to a direction close to the plate roller, and the moving distance is smaller than the hole depth of the engraving starting point;
the engraving head driving module drives a tool tip of the engraving head to reciprocate perpendicular to the cylindrical surface of the printing roller so as to engrave a mesh;
after the response of the engraving head enters a stable state, the auxiliary motion mechanism moves the engraving head to a direction far away from the plate roller;
and the moving unit drives the engraving head to move along the axial direction of the plate roller.
10. The electroengraving control method of claim 9, further comprising the step of rotating the plate roller by a spindle.
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