CN118559497B - Non-contact tool setting system - Google Patents
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- CN118559497B CN118559497B CN202411047683.6A CN202411047683A CN118559497B CN 118559497 B CN118559497 B CN 118559497B CN 202411047683 A CN202411047683 A CN 202411047683A CN 118559497 B CN118559497 B CN 118559497B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/20—Automatic control or regulation of feed movement, cutting velocity or position of tool or work before or after the tool acts upon the workpiece
- B23Q15/22—Control or regulation of position of tool or workpiece
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Abstract
The invention relates to a non-contact tool setting system, belongs to the technical field of tool setting detection, and solves the technical problem that in the prior art, when an automatic tool setting instrument is used for tool setting, the tool setting instrument is easy to wear, so that tool setting is inaccurate. Comprising the following steps: a probe assembly having a mounting end and a probe end; the detection component is electrically connected with a numerical control system of the machine tool; the mounting end is connected with the cutter or the main shaft; the detection end faces the table top of the machine tool; and the calculating module is used for calculating the distance between the detection component and the detected object according to the time of the transmitter transmitting the detection light signal and the time of the receiver receiving the detection light. By detecting the discontinuous change of the transmission distance of the detection light signal, the system can accurately identify the edge of the workpiece, and reduces the positioning error caused by the traditional contact tool setting. The non-contact tool setting avoids direct contact between the detection component and the surface of the workpiece, and prevents the surface of the workpiece from being damaged possibly due to contact.
Description
Technical Field
The invention belongs to the technical field of tool setting systems, relates to a technology for improving tool setting accuracy of a tool setting system, and particularly relates to a non-contact tool setting system.
Background
In the operation process of the numerical control machine tool, tool setting is a very important step. The accuracy of tool setting directly affects the quality and efficiency of the process. The traditional tool setting mode is mainly contact tool setting, and the trigger type measuring device is used for contacting the surface of a workpiece to determine the position of a tool. However, this approach has a number of drawbacks, including the ease of damage to the workpiece surface by contact tool setting, the complexity and time-consuming tool setting process. In addition, contact tool setting can in some cases be difficult to detect workpiece edges, such as complex shapes or feature points of vulnerable surfaces.
In recent years, non-contact tool setting systems have been increasingly used, and such systems perform tool setting in a non-contact manner by using optical sensors and the like, so that various disadvantages of contact tool setting are avoided. However, existing non-contact tool setting systems also have problems, mainly including the following:
lack of accurate workpiece edge identification: existing systems often suffer from identification errors in identifying edges of a workpiece due to the complexity of the reflective properties of the workpiece surface.
Disclosure of Invention
In order to solve the above-mentioned prior art problems, the present invention provides a non-contact tool setting system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
There is provided a non-contact tool setting system comprising:
a probe assembly having a mounting end and a probe end;
The detection component is electrically connected with a numerical control system of the machine tool;
the mounting end is connected with the cutter or the main shaft;
The detection end faces the table top of the machine tool;
the detection assembly includes:
the emitter is arranged at the detection end and used for emitting detection light signals;
the receiver is arranged at the detection end and is used for receiving the reflected detection light signals;
The calculation module is used for calculating the distance between the detection component and the detected object according to the time of the transmitter transmitting the detection light signal and the time of the receiver receiving the detection light;
In addition, on the moving path of the tool or the main shaft, the detection component is close to the workpiece compared with the tool, and the detection component and the tool have a set distance D1;
The detection assembly moves at a speed V1 along the X-axis direction and approaches to the edges of two sides of the X-axis direction of the workpiece, and when the distance value calculated by the calculation module changes discontinuously, the numerical control system records an X-axis coordinate A1 and an X-axis coordinate A2 at the moment, wherein the X-axis is the X-axis direction inherently set by the numerical control system;
The detection assembly moves at a speed V1 along the Y-axis direction and approaches to the edges of two sides of the workpiece in the Y-axis direction respectively, and when the numerical value of the distance value calculated by the calculation module changes discontinuously, the numerical control system records a Y-axis coordinate B1 and a Y-axis coordinate B2 at the moment, wherein the Y-axis is the Y-axis direction inherently set by the numerical control system;
The X-axis coordinate and the Y-axis coordinate of the tool setting point are determined by A1, A2, B1 and B2.
Preferably, the detection assembly moves along the X-axis direction at a speed V2 again and approaches to two sides of the workpiece in the X-axis direction respectively, and when the distance value calculated by the calculation module changes discontinuously, the numerical control system records an X-axis coordinate A3 and an X-axis coordinate A4 at the moment;
the detection assembly moves at a speed V2 along the Y-axis direction and approaches to two sides of the workpiece in the Y-axis direction respectively, and when the distance value calculated by the calculation module is discontinuously changed, the numerical control system records a Y-axis coordinate B3 and a Y-axis coordinate B4 at the moment;
wherein V2< V1;
And (3) obtaining X-axis alignment marks and Y-axis coordinates of the tool setting points again by the A3, the A4, the B3 and the B4, and checking the X-axis alignment marks and the Y-axis coordinates obtained for the first time.
Preferably, the checking comprises:
Respectively calculating the absolute value of the error of the X-axis coordinate and the Y-axis coordinate obtained in the two steps;
If the absolute value of the error exceeds the set threshold, the X-axis coordinate and the Y-axis coordinate obtained in the second time, that is, A3, A4, B3, and B4 are the final coordinates of the tool setting point.
Preferably, the value range of the set threshold is 2 to 5.
Preferably, the main shaft drives the detection assembly to retract to be close to two side edges in the X-axis direction or the Y-axis direction of the workpiece, and the speed is reduced to V2;
Wherein retraction means that the detection assembly moves in a direction opposite to the first movement, i.e. the movement path when moving at speed V1.
Preferably, it comprises:
The pre-front detection assembly is connected with the cutter or the main shaft;
The axis L1 of the pre-front detection assembly and the axis L2 of the main shaft form an included angle a;
And, the value range of the included angle a is as follows: 30 ° to 60 °.
Preferably, the pre-detection assembly comprises:
a pre-emitter for emitting a pre-detection light signal;
A pre-receiver for receiving the reflected pre-detection light signal;
the pre-detection module is used for receiving the pre-detection light from the pre-emitter and the pre-receiver according to the time of the pre-emitter emitting the pre-detection light signal and the time of the pre-receiver receiving the pre-detection light.
Preferably, the method comprises the steps of,
A distance D2 of the pre-detection assembly from the spindle, and d1=d2;
And, on the path of movement of the tool or spindle, the detection assembly and the pre-detection assembly are closer to the workpiece than the tool.
Preferably, the value ranges of D1 and D2 are: 20mm to 40mm.
Preferably, the method comprises the steps of,
Comprising the following steps:
a rotating assembly, the detection assembly and the pre-detection assembly being connected to the rotating assembly;
The rotating assembly is electrically connected with the numerical control system;
the rotating assembly has a rotating action along the axial direction of the main shaft;
and, the rotating assembly is configured to rotate the detection assembly and the pre-detection assembly according to a movement path of the spindle;
and, in the direction of the moving path, the pre-front detection assembly and the detection assembly are always located in front of the cutter.
The invention provides a non-contact tool setting system, which has the beneficial effects that:
the tool setting precision is improved: by detecting the discontinuous change of the transmission distance of the detection light signal, the system can accurately identify the edge of the workpiece, and reduces the positioning error caused by the traditional contact tool setting.
Reducing surface damage of the workpiece: the non-contact tool setting avoids direct contact between the detection component and the surface of the workpiece, and prevents the surface of the workpiece from being damaged possibly due to contact.
Simplifying the tool setting process: by automatically recording and calculating the coordinates of the X axis and the Y axis, the system can quickly determine the position of the tool setting point, simplifies the tool setting operation and saves time.
Drawings
Fig. 1 is a perspective view of a non-contact tool setting system according to the present invention;
FIG. 2 is an enlarged schematic view of a portion of the structure shown in FIG. 1 at A;
FIG. 3 is a top view of a non-contact tool setting system according to the present invention;
FIG. 4 is a side view of a non-contact tool setting system according to the present invention;
FIG. 5 is an enlarged partial schematic view of the structure of FIG. 4 at B;
Fig. 6 is a schematic diagram showing the relationship between the pre-detection assembly and the spindle in the non-contact tool setting system according to the present invention.
Reference numerals illustrate:
1. A detection assembly; 101. a mounting end; 102. a detection end; 2. a machine tool; 201. a cutter; 202. a main shaft; 3. a pre-detection assembly; 4. and (5) rotating the assembly.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 6, the following embodiments of the present invention are provided:
as shown in fig. 1 to 3, a first embodiment of the present invention proposes a non-contact tool setting system, including:
a probe assembly 1 having a mounting end 101 and a probe end 102;
the detection assembly 1 is electrically connected with a numerical control system of the machine tool 2;
the mounting end 101 is connected with a cutter 201 or a main shaft 202;
the detection end 102 faces the table top of the machine tool 2;
The detection assembly 1 comprises:
The emitter is arranged at the detection end 102 and is used for emitting detection light signals;
the receiver is arranged at the detection end 102 and is used for receiving the reflected detection light signals;
The calculation module is used for calculating the distance between the detection component and the detected object according to the time of the transmitter transmitting the detection light signal and the time of the receiver receiving the detection light;
The detection assembly 1 moves at a speed V1 along the X-axis direction and approaches to the edges of two sides of the X-axis direction of a workpiece respectively, and when the distance value calculated by the calculation module changes discontinuously, the numerical control system records an X-axis coordinate A1 and an X-axis coordinate A2 at the moment, wherein the X-axis is the X-axis direction inherently set by the numerical control system;
The detection assembly 1 moves at a speed V1 along the Y-axis direction and approaches to the two side edges of the workpiece in the Y-axis direction respectively, and when the numerical value of the distance value calculated by the calculation module changes discontinuously, the numerical control system records a Y-axis coordinate B1 and a Y-axis coordinate B2 at the moment, wherein the Y-axis is the Y-axis direction inherently set by the numerical control system;
The X-axis coordinate and the Y-axis coordinate of the tool setting point are determined by A1, A2, B1 and B2.
In this embodiment, the detection component 1 emits a detection light signal through the emitter, and when the detection light signal irradiates the surface of the workpiece and is reflected back to the receiver, the detection component 1 can sense the reflected signal and calculate the distance between the detection component 1 and the detected object (refer to the edge of the workpiece) through the calculation module.
In the prior art, since the workpiece edge of the workpiece is generally selected as the setting position, the accuracy of tool setting is ensured. However, since the workpiece edge is typically a cross-section of the workpiece surface, etc., it is difficult to locate these positions to very accurate points. Moreover, when the edge of the workpiece is used as a setting position of the tool setting, if the workpiece cannot be accurately positioned to the position, the actual position parameter and the standard position parameter of the position have great deviation, and the tool setting accuracy is obviously reduced.
Based on this, in this embodiment, when the distance value calculated by the calculation module changes discontinuously, it specifically indicates that a point of mutation is found, for example, the previously detected value suddenly changes to about 2 (e.g. 2.00,2.01,2.02,1.99, etc.) after having loitered around 5 (e.g. 5.01,5.03,5.02). The reason is that the edge of the workpiece is usually a cross-section, and the height of the workpiece at this position varies significantly, based on which, when the detection assembly 1 moves in the X-axis or Y-axis direction and approaches the edge of the workpiece, the distance between the detection assembly and the object to be detected calculated by the calculation module varies significantly, i.e. it indicates that the detection light signal has encountered the edge of the workpiece. The numerical control system records the corresponding X-axis coordinates (A1 and A2) and Y-axis coordinates (B1 and B2) at the moment such a change is detected. The X-axis coordinate and the Y-axis coordinate of the tool setting point are obtained, and the tool setting process is realized.
Through the process, the non-contact tool setting system can accurately position the edge position of the workpiece under the condition that the non-contact tool setting system does not contact the surface of the workpiece. The method avoids the surface damage of the workpiece possibly caused by contact tool setting, simplifies the tool setting process and improves the tool setting precision and efficiency.
On the other hand, the probe assembly 1 may also scan the machined portion in real time as the tool 201 performs machining, thereby generating machining data such as the size of the thread, the flatness of the surface, and the like. Based on this, the processing quality can be detected to improve the forming quality of the workpiece.
Of course, since the detection assembly 1 cannot be completely in the same line with the tool (particularly, the problem that the tool collides with the workpiece due to the approach of the tool to the workpiece compared with the detection assembly 1 is avoided), the installation position of the detection assembly 1 can be fixed so that the distance between the detection assembly and the tool is fixed and predictable, and the distance can be substituted and adaptively modified when the calculation of the X-axis coordinate and the Y-axis coordinate is performed.
Specifically, the present embodiment has the following advantages:
the tool setting precision is improved: by detecting the discontinuous change of the transmission distance of the detection light signal, the system can accurately identify the edge of the workpiece, and reduces the positioning error caused by the traditional contact tool setting.
Reducing surface damage of the workpiece: the non-contact tool setting avoids direct contact between the detection component and the surface of the workpiece, and prevents the surface of the workpiece from being damaged possibly due to contact.
Simplifying the tool setting process: by automatically recording and calculating the coordinates of the X axis and the Y axis, the system can quickly determine the position of the tool setting point, simplifies the tool setting operation and saves time.
The application range is wide: the system can identify the edge characteristics of various workpiece shapes and materials, is suitable for workpieces with complex shapes or vulnerable surfaces, and improves the adaptability and the flexibility of the tool setting system.
A second embodiment of the present invention provides a non-contact tool setting system, and further includes, on the basis of the first embodiment: the detection assembly 1 moves along the X-axis direction at a speed V2 again and approaches to two sides of the workpiece in the X-axis direction respectively, and when the distance value calculated by the calculation module is subjected to discontinuous change, the numerical control system records an X-axis coordinate A3 and an X-axis coordinate A4 at the moment;
The detection assembly 1 moves at a speed V2 along the Y-axis direction and approaches to two sides of the workpiece in the Y-axis direction respectively, and when the distance value calculated by the calculation module is discontinuously changed, the numerical control system records a Y-axis coordinate B3 and a Y-axis coordinate B4 at the moment;
wherein V2< V1;
And (3) obtaining X-axis alignment marks and Y-axis coordinates of the tool setting points again by the A3, the A4, the B3 and the B4, and checking the X-axis alignment marks and the Y-axis coordinates obtained for the first time.
In the present embodiment, by reducing the moving speed of the probe assembly 1 to V2, the system can detect the edge position of the workpiece again with higher accuracy. Through multiple detection and coordinate verification, the positioning of the tool setting point is ensured to be more accurate, and the reliability and the precision of the tool setting process are improved. This embodiment can effectively eliminate errors that may exist in the primary measurement, thereby further optimizing the accuracy and efficiency of the tool setting operation.
In a specific embodiment, the specific process of verification is that the X-axis coordinate and the Y-axis coordinate obtained in two times are respectively calculated as absolute values of errors;
If the absolute value of the error exceeds the set threshold, the X-axis coordinate and the Y-axis coordinate obtained in the second time, that is, A3, A4, B3, and B4 are the final coordinates of the tool setting point. The reason is that the speed V2 is slower when approaching the edge position of the workpiece for the second time, so that the edge position of the workpiece can be more accurately identified, and the signal has enough time to be transmitted to the calculation module, thereby avoiding the deviation of the identification position.
In a specific embodiment, the value range of the set threshold is 2 to 5. Preferably 2, for example, the first X-axis coordinate is 135, the second X-axis coordinate is 138, the absolute value of the error is 3, and the second X-axis coordinate is 138 as the tool setting point X-axis coordinate if the absolute value exceeds a set threshold (the value is 2). And checking the Y-axis coordinate.
The main shaft drives the detection assembly to retract to be close to the edges of the two sides of the workpiece in the X axis direction or the Y axis direction, and the speed is reduced to V2;
Wherein retraction means that the detection assembly moves in a direction opposite to the first movement, i.e. the movement path when moving at speed V1. That is, the probe assembly does not need to return to the origin (point where the X-axis coordinate and the Y-axis coordinate are both 0, which are inherently set by the index control system) when acquiring the X-axis coordinate and the Y-axis coordinate for the second time, and only needs to move along a path opposite to the first movement path to approach the edge position of the workpiece again, and the speed is reduced to V2, thereby realizing a faster and more efficient process of acquiring the coordinates for the second time. After the secondary acquisition is completed, the spindle 202 continues to move according to the set route.
Of course, for some workpieces with more regular shapes, such as rectangles, the detection assembly can realize tool setting detection by positioning four sides of the workpiece.
Alternatively, for some workpieces having geometric shapes, such as circular or arcuate end surfaces, the detection assembly provided in this embodiment may also be configured to detect tool setting by positioning the sides.
In summary, the non-contact tool setting system provided in this embodiment can accurately identify and position the end surface of a regular or irregular workpiece, thereby ensuring the accuracy of tool setting.
The invention effectively solves the defects of the traditional contact type tool setting system through the innovative design of the non-contact type tool setting system, overcomes the defects of the traditional non-contact type tool setting system in the aspects of workpiece edge identification precision and tool setting operation complexity, and provides reliable guarantee for high-precision machining of a numerical control machine tool.
As shown in fig. 4 to 6, a third embodiment of the present invention provides a non-contact tool setting system, which includes, based on the above embodiment:
the pre-detection assembly 3 is connected with the cutter 201 or the main shaft 202.
The pre-detection assembly 3 comprises:
a pre-emitter for emitting a pre-detection light signal;
A pre-receiver for receiving the reflected pre-detection light signal;
the pre-calculation module is used for calculating the distance between the pre-detection component 3 and the detected object (refer to the edge of the workpiece) according to the time of the pre-emitter emitting the pre-detection light signal and the time of the pre-receiver receiving the pre-detection light.
In this embodiment, it is further found that the above-described method allows the spindle 202 to perform the secondary displacement, and if the number of workpiece edges is large, the repetitive displacement of the spindle 202 increases.
Based on this, the purpose of adding the pre-detection assembly 3 is to let the pre-detection assembly 3 detect the workpiece edge in advance, thereby feeding back a signal to the numerical control system such that its speed is reduced to V2, at which time the detection assembly 1 approaches the workpiece edge at a low speed V2 and locates the exact position of the workpiece edge.
Specifically, through the above-mentioned process, detection subassembly 3 and detection subassembly 1 collaborative work in advance, have improved the tool setting precision for under the condition of main shaft 202 single displacement, make detection subassembly 1 carry out accurate detection with the speed of expecting, improved tool setting efficiency.
The fourth embodiment of the present invention provides a non-contact tool setting system, and on the basis of the previous embodiment, an included angle a is formed between an axis L1 of the pre-front detection assembly 3 and an axis L2 of the main shaft 202;
And, the value range of the included angle a is as follows: 30 ° to 60 °.
In this embodiment, the included angle a has the meaning that by setting the included angle a between the axis L1 of the pre-detection assembly 3 and the axis L2 of the spindle 202, the following important functions and advantages can be achieved:
advanced detection function: the design of the included angle a enables the pre-detection assembly 3 to detect before the main shaft 202 approaches the edge of the workpiece, and position information of the edge of the workpiece is obtained in advance.
Avoiding interference: the arrangement of the angle a ensures that the pre-detection assembly 3 and the detection assembly 1 do not interfere with each other during operation. The pre-detection assembly 3 can detect in front of the spindle 202, and the detection assembly 1 can perform more accurate detection and positioning work immediately after.
The safety is improved: by detecting in advance, the pre-detection assembly 3 can detect possible obstacles or abnormal conditions, the numerical control system can respond timely, the cutter 201 is prevented from colliding with a workpiece or the machine tool 2, and the safety of the machining process is improved.
Reducing tool setting errors: the advanced position information provided by the pre-detection assembly 3 can be compared with the accurate position information of the detection assembly 1, and the numerical control system can perform more accurate tool setting operation according to the combination of the advanced position information and the accurate position information, so that tool setting errors are reduced, and machining precision is improved.
In a specific embodiment, the included angle a is adjusted, so that the workpiece can be optimized for different workpiece shapes and processing requirements. The specific value range of the included angle a is 30-60 degrees, and the included angle a can be adjusted according to specific application requirements. For example, for processing tasks requiring higher precision, a smaller included angle a can be selected to ensure that the distance between pre-probing and accurate probing is minimized, thereby improving probing precision; for processing tasks of larger workpieces or complex shapes, a larger included angle a can be selected to expand the detection range and increase the advanced detection range of the edges of the workpieces.
Through the design, the embodiment provides a non-contact tool setting system capable of remarkably improving tool setting precision and efficiency, and is particularly suitable for precision machining of workpieces with complex shapes.
In one embodiment, the pre-detection assembly 3 is at a distance D2 from the spindle 202, and d1=d2;
And, on the path of movement of the tool 201 or spindle 202, the detection assembly 1 and the pre-detection assembly 3 are closer to the workpiece than the tool 201. That is, it is necessary to ensure that both the probe assembly 1 and the pre-probe assembly 3 are in front of the tool 201 to avoid the problem of workpiece wear caused by the tool 201 first contacting the workpiece. Also, the detection assembly 1 and the pre-detection assembly 3 may be located at the same distance (referred to as distance from the tool 201). The value range of d1=d2 is 20mm to 40mm, and as described above, this distance needs to be added or subtracted as a coefficient when calculating the X-axis coordinate and the Y-axis coordinate of the tool setting point.
A fifth embodiment of the present invention provides a non-contact tool setting system, and based on the previous embodiment, the system includes:
a rotating assembly 4, said detecting assembly 1 and said pre-detection assembly 3 being connected to said rotating assembly 4;
wherein the rotating assembly 4 is electrically connected with the numerical control system;
The rotation unit 4 has a rotation motion in the axial direction of the main shaft 202;
And, the rotating assembly 4 is configured to rotate the detecting assembly 1 and the pre-advance detecting assembly 3 according to the moving path of the spindle 202;
also, in the direction of the moving path, the pre-front detection unit 3 is always located in front of the cutter 201.
In this embodiment, since the spindle 202 is moved along the X-axis and the Y-axis, and the pre-front detecting assembly 3 needs to be always located in front of the tool 201, the rotating assembly 4 can adjust the angles and positions of the detecting assembly 1 and the pre-front detecting assembly 3 in real time, so as to ensure that the pre-front detecting assembly 3 can always detect the edge of the workpiece in advance and feed back the position information to the numerical control system.
In a specific embodiment, the rotating assembly 4 can be driven by a servo motor, and the angle and the position of the detecting assembly 1 and the pre-detecting assembly 3 are adjusted by controlling the rotation of the motor. The servo motor is connected with a numerical control system through control signals, the numerical control system calculates the optimal rotation angle and position according to the advanced detection information provided by the pre-detection assembly 3, and sends the control signals to the servo motor to enable the servo motor to execute corresponding rotation actions.
Furthermore, the rotating assembly 4 may incorporate position sensors (not shown in the figures) for detecting the real-time position and angle of the detecting assembly 1 and the pre-detecting assembly 3, ensuring that they are always aligned to the area to be detected. The detection data of the position sensor are fed back to the numerical control system, and the numerical control system adjusts in real time according to the data, so that the detection assembly 1 and the pre-detection assembly 3 are always in the optimal detection positions.
Through the design, the embodiment provides a non-contact tool setting system which can adapt to complex processing environments and improve detection precision and processing efficiency, and is particularly suitable for processing tasks of precision processing and complex workpieces.
In one embodiment, the position sensor is an angle encoder or an optical position sensor.
Angle encoder: the angle encoder is used for detecting the rotation angle of the detection assembly 1 and the pre-detection assembly 3. The angle encoder provides real-time position information by measuring the rotation angle of the rotation shaft. The angle encoder has high precision and high resolution, and is suitable for occasions needing accurate angle control.
Optical position sensor: the optical position sensor determines the position of the detection assembly 1 and the pre-detection assembly 3 by detecting the displacement of the light beam. The optical position sensor has the characteristics of non-contact, high precision and high response speed, and is suitable for occasions with higher requirements on position precision.
In particular applications, the angle encoder and the optical position sensor may be used in combination to achieve higher detection accuracy and stability. The rotation angle is detected through the angle encoder, the linear displacement is detected through the optical position sensor, the data of the rotation angle and the linear displacement are integrated, and the numerical control system can be adjusted and controlled more accurately.
In the description of embodiments of the invention, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
In describing embodiments of the present invention, it will be understood that the terms "-" and "-" are intended to be inclusive of the two numerical ranges, and that the ranges include the endpoints. For example: "A-B" means a range greater than or equal to A and less than or equal to B. "A-B" means a range of greater than or equal to A and less than or equal to B.
In the description of embodiments of the present invention, the term "and/or" is merely an association relationship describing an association object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A non-contact tool setting system, comprising:
a probe assembly having a mounting end and a probe end;
The detection component is electrically connected with a numerical control system of the machine tool;
the mounting end is connected with the cutter or the main shaft;
The detection end faces the table top of the machine tool;
the detection assembly includes:
the emitter is arranged at the detection end and used for emitting detection light signals;
the receiver is arranged at the detection end and is used for receiving the reflected detection light signals;
The calculation module is used for calculating the distance between the detection component and the detected object according to the time of the transmitter transmitting the detection light signal and the time of the receiver receiving the detection light;
In addition, on the moving path of the tool or the main shaft, the detection component is close to the workpiece compared with the tool, and the detection component and the tool have a set distance D1;
The detection assembly moves at a speed V1 along the X-axis direction and approaches to the edges of two sides of the X-axis direction of the workpiece, and when the distance value calculated by the calculation module changes discontinuously, the numerical control system records an X-axis coordinate A1 and an X-axis coordinate A2 at the moment, wherein the X-axis is the X-axis direction inherently set by the numerical control system;
The detection assembly moves at a speed V1 along the Y-axis direction and approaches to the edges of two sides of the workpiece in the Y-axis direction respectively, and when the numerical value of the distance value calculated by the calculation module changes discontinuously, the numerical control system records a Y-axis coordinate B1 and a Y-axis coordinate B2 at the moment, wherein the Y-axis is the Y-axis direction inherently set by the numerical control system;
Determining X-axis coordinates and Y-axis coordinates of the tool setting points by A1, A2, B1 and B2;
The detection assembly moves along the X-axis direction at a speed V2 again and approaches to two sides of the X-axis direction of the workpiece, and when the distance value calculated by the calculation module is subjected to discontinuous change, the numerical control system records an X-axis coordinate A3 and an X-axis coordinate A4 at the moment;
the detection assembly moves at a speed V2 along the Y-axis direction and approaches to two sides of the workpiece in the Y-axis direction respectively, and when the distance value calculated by the calculation module is discontinuously changed, the numerical control system records a Y-axis coordinate B3 and a Y-axis coordinate B4 at the moment;
wherein V2< V1;
obtaining X-axis alignment marks and Y-axis coordinates of the tool setting points again by the A3, the A4, the B3 and the B4, and checking the X-axis alignment marks and the Y-axis coordinates obtained for the first time;
The verification includes:
Respectively calculating the absolute value of the error of the X-axis coordinate and the Y-axis coordinate obtained in the two steps;
If the absolute value of the error exceeds the set threshold, the X-axis coordinate and the Y-axis coordinate obtained in the second time, that is, A3, A4, B3, and B4 are the final coordinates of the tool setting point.
2. The non-contact tool setting system according to claim 1, wherein,
The value range of the set threshold is 2 to 5.
3. The non-contact tool setting system according to claim 1, wherein,
The main shaft drives the detection assembly to retract to be close to the edges of the two sides of the workpiece in the X axis direction or the Y axis direction, and the speed is reduced to V2;
Wherein retraction means that the detection assembly moves in a direction opposite to the first movement, i.e. the movement path when moving at speed V1.
4. The non-contact tool setting system of claim 1, comprising:
The pre-front detection assembly is connected with the cutter or the main shaft;
The axis L1 of the pre-front detection assembly and the axis L2 of the main shaft form an included angle a;
And, the value range of the included angle a is as follows: 30 ° to 60 °.
5. The non-contact tool setting system according to claim 4, wherein,
The pre-detection assembly includes:
a pre-emitter for emitting a pre-detection light signal;
A pre-receiver for receiving the reflected pre-detection light signal;
the pre-detection module is used for receiving the pre-detection light from the pre-emitter and the pre-receiver according to the time of the pre-emitter emitting the pre-detection light signal and the time of the pre-receiver receiving the pre-detection light.
6. The non-contact tool setting system according to claim 5, wherein,
A distance D2 of the pre-detection assembly from the spindle, and d1=d2;
And, on the path of movement of the tool or spindle, the detection assembly and the pre-detection assembly are closer to the workpiece than the tool.
7. The non-contact tool setting system according to claim 6, wherein,
The value ranges of the D1 and the D2 are as follows: 20mm to 40mm.
8. The non-contact tool setting system according to claim 7, wherein,
Comprising the following steps:
a rotating assembly, the detection assembly and the pre-detection assembly being connected to the rotating assembly;
The rotating assembly is electrically connected with the numerical control system;
the rotating assembly has a rotating action along the axial direction of the main shaft;
and, the rotating assembly is configured to rotate the detection assembly and the pre-detection assembly according to a movement path of the spindle;
and, in the direction of the moving path, the pre-front detection assembly and the detection assembly are always located in front of the cutter.
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| EP3456469A1 (en) * | 2017-09-13 | 2019-03-20 | Renishaw PLC | Non-contact tool setting apparatus and method |
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| CN110560976A (en) * | 2019-09-16 | 2019-12-13 | 北京石油化工学院 | steel coil welding method and system |
| CN114290177A (en) * | 2021-12-01 | 2022-04-08 | 中国工程物理研究院激光聚变研究中心 | Non-contact type precise tool setting method for grinding aspheric optical element |
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