Micro-jet laser calibration tool
By designing a micro jet laser calibration tool, combining Renishaw's probe center detection method and micro jet water column boundary contact method, the calibration error problem of micro jet nozzle assembly is solved, the multi-axis three-dimensional machining accuracy is improved, and high-precision micro jet laser calibration is achieved.
Patent Information
- Application Number
- CN202521329555.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2035-06-27
AI Technical Summary
In multi-axis laser processing, PTCP parameter calibration of the rotation axis of the micro jet nozzle assembly is difficult to achieve, and traditional calibration methods cannot coincide with the processing position coordinates of the micro jet laser, resulting in large calibration errors and insufficient accuracy.
A micro jet laser calibration tool is designed, including the base and the calibration plane. Calibration holes are arranged concentrically on the outer edge of the calibration plane. Combined with Renishaw's probe center detection method and the micro jet water column boundary contact method, position deviation compensation is achieved, and the height reference plane and the fixed seat are provided to ensure parallelism through the adjustment groove.
It improves the accuracy of micro jet laser in multi-axis three-dimensional processing, reduces calibration errors, and realizes high-precision calibration of micro jet nozzle assembly and Renishaw probe, which is suitable for multi-axis three-dimensional processing.
Smart Images
Figure CN223210660U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of micro-jet laser processing, and in particular relates to a micro-jet laser calibration tool. Background Art
[0002] Microjet laser machining technology is now being applied to a wide range of machining applications. Multi-axis laser machining requires calibration of the PTCP (Rotational Tool Center Point) parameters of the microjet nozzle assembly's rotary axis. Traditional machining centers typically use standard tool calibration or Renishaw probe calibration methods, both of which require concentric mounting with the machining center's spindle. Traditional laser equipment, on the other hand, often uses laser dotting or calibration blocks, which also require mounting on the laser processing head.
[0003] Microjet nozzle assemblies differ from standard tooling in conventional machining centres and traditional laser equipment. This is because the microjet laser's machining datum is a micro-jet water jet, making it impossible to concentrically mount the Renishaw probe or calibration block. Consequently, the coordinates of the calibrated position and the microjet laser's machining position do not coincide. Microjet lasers are not suitable for machining very small laser dots, so laser dotting methods cannot be used for calibration.
[0004] Therefore, if the calibration accuracy of the microjet laser needs to be improved with the help of a Renishaw probe, the positional deviation between the Renishaw probe and the microjet nozzle assembly needs to be resolved. Utility Model Content
[0005] In order to solve the above problems existing in the prior art, the present invention provides a micro-jet laser calibration tool. The technical problems to be solved by the present invention are achieved through the following technical solutions:
[0006] The utility model provides a micro-jet laser calibration tool, comprising: a base and a calibration plane, wherein the base comprises a fixing seat and a connecting seat, the calibration plane, the connecting seat and the fixing seat are arranged in sequence from top to bottom, and the fixing seat is fixed on a machine tool workbench; the outer edge of the calibration plane extends to the outside of the connecting seat, a calibration hole is provided on the calibration plane, and the calibration hole is located in the central area of the calibration plane.
[0007] In one embodiment of the present invention, the calibration plane is a square, and the calibration holes are concentrically arranged with four outer edges of the calibration plane.
[0008] In one embodiment of the present invention, the calibration hole passes through the calibration plane and the base in sequence from top to bottom.
[0009] In one embodiment of the present invention, the outer edge of the calibration plane is used to calibrate the plane position of the micro-jet water column, and the calibration hole is used for calibrating a Renishaw probe.
[0010] In one embodiment of the present invention, the upper surface of the calibration plane is a height reference plane, and the flatness of the upper surface of the calibration plane is less than 0.005 mm.
[0011] In one embodiment of the present invention, a plurality of adjustment slots are provided on the fixing seat, and the fixing seat is fixed to the machine tool workbench through the plurality of adjustment slots.
[0012] In one embodiment of the present invention, the adjustment groove is a strip groove, and at least two of the strip grooves are symmetrically distributed on both sides of the fixing seat.
[0013] In one embodiment of the present invention, the parallelism between the upper surface of the calibration plane and the lower surface of the fixing seat is less than 0.005 mm.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] This new micro-jet laser calibration fixture features a base fixed to a machine tool worktable, a connector that connects the calibration plane and the mounting base. The outer edge of the calibration plane extends beyond the connector, and the calibration hole is located in the center of the calibration plane. This concentric structure allows a single calibration fixture to simultaneously meet the dual calibration requirements of the micro-jet water column boundary contact method and the Renishaw probe center detection method. This compensates for calibration errors caused by the different positions of the Renishaw probe and the micro-jet nozzle assembly, improving the accuracy of micro-jet laser multi-axis 3D machining.
[0016] The utility model provides a physical reference for the height direction calibration of the micro jet nozzle assembly through the coordinated design of the height reference plane and the lower surface of the fixing seat, and ensures the parallelism of the calibration tool and the machine tool coordinate system in conjunction with the adjustment slot installation structure.
[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a structural schematic diagram of a micro-jet laser calibration tool provided by an embodiment of the utility model;
[0019] Figure 2Schematic diagram of a micro jet nozzle assembly and a Renishaw probe provided by an embodiment of the present utility model;
[0020] Figure 3 This is a schematic diagram of the plane position calibration of the micro jet nozzle assembly provided by the embodiment of the utility model;
[0021] Figure 4 This is a schematic diagram of the height position calibration of the micro jet nozzle assembly provided by an embodiment of the utility model;
[0022] Figure 5 This is a schematic diagram of the calibration of a Renishaw probe provided by an embodiment of the utility model.
[0023] Reference numerals: 100 - base; 110 - fixing seat; 111 - adjustment slot; 120 - connecting seat; 200 - calibration plane; 210 - calibration hole; 10 - micro jet nozzle assembly; 20 - Renishaw probe; 30 - standard measuring rod. DETAILED DESCRIPTION
[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, a micro-jet laser calibration tool proposed according to the utility model is described in detail below with reference to the accompanying drawings and specific implementation methods.
[0025] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.
[0026] Example 1
[0027] like Figure 2 As shown, Figure 2 This is a schematic diagram of the micro-jet nozzle assembly and the Renishaw probe provided by an embodiment of the present invention. The position reference of the micro-jet laser is a micro-jet water column. When collecting coordinates, the coordinate collection is often completed by contacting the part boundary. The Renishaw probe 20 can collect the coordinates of the center of the circular contour and the coordinates of the part surface. However, due to physical structural limitations, the Renishaw probe 20 and the micro-jet nozzle assembly 10 cannot be coaxially installed, resulting in a certain position deviation between the two, making it impossible for the calibrated position to coincide with the coordinates of the micro-jet laser processing position. In view of this, the present invention proposes a micro-jet laser calibration tool, which integrates two calibration structures for calibrating the micro-jet nozzle assembly 10 and the Renishaw probe 20, achieving the purpose of compensating for position deviation on the calibration tool, that is, realizing coordinate conversion.
[0028] like Figures 1 to 5 As shown, Figure 1 This is a structural schematic diagram of a micro-jet laser calibration tool provided by an embodiment of the utility model; Figure 3 This is a schematic diagram of the plane position calibration of the micro jet nozzle assembly provided by the embodiment of the utility model; Figure 4 This is a schematic diagram of the height position calibration of the micro jet nozzle assembly provided by an embodiment of the utility model; Figure 5 This is a schematic diagram of the calibration of a Renishaw probe provided by an embodiment of the utility model.
[0029] In this embodiment, the micro-jet laser calibration tooling includes a base 100 and a calibration plane 200, wherein the base 100 includes a fixing seat 110 and a connecting seat 120, the calibration plane 200, the connecting seat 120 and the fixing seat 110 are arranged in sequence from top to bottom, and the fixing seat 110 is fixed on the machine tool workbench; the outer edge of the calibration plane 200 extends to the outside of the connecting seat 120, and a calibration hole 210 is provided on the calibration plane 200, and the calibration hole 210 is located in the central area of the calibration plane 200.
[0030] In one alternative embodiment, the calibration plane 200 is square, with calibration holes 210 concentrically arranged along the four outer edges of the calibration plane 200. The calibration holes 210 extend sequentially from top to bottom through the calibration plane 200 and the base 100 to prevent liquid retention. For example, the outer edges of the calibration plane 200 are used to calibrate the planar position of the microjet water column, recording coordinates through contact rupture of the water column; the calibration holes 210 are used to calibrate the Renishaw probe 20.
[0031] In an optional embodiment, the upper surface of the calibration plane 200 is a height reference plane, and the flatness of the upper surface of the calibration plane 200 is less than 0.005 mm.
[0032] In an optional embodiment, the lower surface of the fixing seat 110 serves as an auxiliary reference plane, and the parallelism between the upper surface of the calibration plane 200 and the lower surface of the fixing seat 110 is less than 0.005 mm to ensure that the upper surface of the calibration plane 200 is parallel to the mounting surface of the machine tool worktable.
[0033] In an optional embodiment, a plurality of adjustment slots 111 are provided on the fixing base 110, and the fixing base 110 is fixed to the machine tool workbench through the plurality of adjustment slots 111. Exemplarily, the adjustment slots 111 are strip slots, and at least two strip slots are symmetrically distributed on both sides of the fixing base 110. The micro-jet laser calibration tool is fixed to the machine tool workbench through the strip slots, and the position of the outer edge of the calibration plane 200 can be adjusted through the strip slots so that its outer edge is parallel to the X-axis and Y-axis of the machine tool workbench, respectively. It is understandable that the machine tool workbench can be connected by passing through the strip slots with bolts or T-shaped connecting fixtures of the machine tool workbench, and the margin of the strip slots in the width direction can be set to ensure the adjustment space in the width direction, so that the outer edge of the calibration plane 200 can be made parallel to the X-axis and Y-axis of the machine tool workbench, respectively, through the strip slots.
[0034] The working process of the micro-jet laser calibration tool of the utility model is as follows:
[0035] First, the micro-jet laser calibration fixture is fixed on the machine tool workbench through multiple adjustment slots 111, and a dial indicator is used to check that the outer edges of the calibration plane 200 are parallel to the X-axis and Y-axis of the machine tool workbench.
[0036] Secondly, the microjet laser is calibrated using the microjet water column boundary contact method. The microjet nozzle assembly 10 is moved to the outer edge of the calibration plane 200. When the microjet water column contacts the outer edge of the calibration plane 200, the water column state is destroyed, thereby determining the contact position coordinates. The microjet water column is then brought into contact with the four outer edges of the calibration plane 200 respectively. By collecting the positions of the four outer edges, the plane coordinates of the center position of the calibration plane 200 are obtained. Turn off the microjet laser and water column, slowly move the microjet nozzle assembly 10 to the top of the calibration plane 200, use the microjet nozzle assembly 10 to directly contact the standard measuring rod 30 for height position calibration, and obtain the height coordinate of the center position of the calibration plane 200 .
[0037] Then, the center of the calibration hole 210 is measured using the Renishaw probe center detection method. The Renishaw probe 20 is moved to the center of the calibration hole 210 to obtain the plane coordinates of the center position of the calibration plane 200. , then move the Renishaw probe 20 to the top of the calibration plane 200 to obtain the height coordinate of the center position of the calibration plane 200 .
[0038] The center position of the calibration plane 200 obtained by two methods and Perform difference calculation to obtain the relative position between the micro jet nozzle assembly 10 and the Renishaw probe 20 .
[0039] Without changing the machine tool, the rotation center positions of the machine tool's A-axis (rotation axis rotating around the plane X direction) and C-axis (rotation axis rotating around the height Z direction) are fixed and can be measured in advance by the Renishaw probe 20. As the working coordinate origin, it is used for subsequent RTCP parameter calibration, where: for The distance between the coordinate and the machine table surface.
[0040] Since there is a certain position deviation between the Renishaw probe 20 and the micro jet nozzle assembly 10, it is necessary to use the relative position To achieve coordinate transformation, the calibration coordinates are obtained as follows: , that is, the processing position coordinates of the microjet laser after deviation compensation, where , , .
[0041] Since the micro jet nozzle assembly 10 is a consumable part during operation, the nozzle may need to be replaced. After the nozzle is replaced, the position of the micro jet water column may change. Therefore, after being fixed, the micro jet laser calibration tool can be kept in the non-working position of the machine tool workbench. At this time, the micro jet water column can be recalibrated by the micro jet laser calibration tool to obtain a new center position of the calibration plane 200. .
[0042] Since the position of the micro-jet laser calibration fixture remains unchanged, the Renishaw probe 20 is used to obtain the center of the circle by the Renishaw probe detection method. Can be applied directly to obtain the new relative position through difference calculation ,Similarly, the new calibration coordinates can be obtained based on the new relative position and the ,working coordinate origin.
[0043] Notably, the microjet laser calibration fixture of this utility model addresses the issue of insufficient machining accuracy in multi-axis applications using microjet lasers. After measuring the working coordinate origin and the center position of the calibration plane 200 using a Renishaw probe 20, the measurement results from the Renishaw probe 20 and the microjet laser calibration fixture can be used to calibrate the equipment's RTCP parameters with high precision even after replacing the nozzle. Furthermore, based on the characteristics of microjet lasers, this utility model converts traditional laser head calibration to position calibration using a microjet water column. This process only requires the microjet water column boundary contact method for calibration, reducing calibration errors.
[0044] This micro-jet laser calibration fixture features a base fixed to a machine tool worktable, a connector that connects the calibration plane and the mounting base. The outer edge of the calibration plane extends beyond the connector, and the calibration hole is located in the center of the calibration plane. This concentric structure allows a single calibration fixture to simultaneously meet the dual calibration requirements of the micro-jet water column boundary contact method and the Renishaw probe center detection method. This compensates for calibration errors caused by the different positions of the Renishaw probe and the micro-jet nozzle assembly, improving the accuracy of micro-jet laser multi-axis 3D machining.
[0045] The utility model provides a physical reference for the height direction calibration of the micro jet nozzle assembly through the coordinated design of the height reference plane and the lower surface of the fixing seat, and ensures the parallelism of the calibration tool and the machine tool coordinate system in conjunction with the adjustment slot installation structure.
[0046] It should be noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not explicitly listed. Without further limitation, elements defined by the phrase "comprising a..." do not preclude the presence of additional identical elements in the article or device comprising the elements. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. References to directions or positional relationships, such as "upper," "lower," "left," and "right," are based on the directions or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification of the present invention. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention.
[0047] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.
Claims
1. A micro-jet laser calibration tool, characterized in that: include: A base and a calibration plane, wherein the base includes a fixing seat and a connecting seat, the calibration plane, the connecting seat and the fixing seat are arranged in sequence from top to bottom, and the fixing seat is fixed on the machine tool workbench; The outer edge of the calibration plane extends outward from the connecting seat. A calibration hole is provided on the calibration plane, and the calibration hole is located in the central area of the calibration plane.
2. The micro-jet laser calibration tool according to claim 1, characterized in that: The calibration plane is a square, and the calibration holes are concentrically arranged with four outer edges of the calibration plane.
3. The micro-jet laser calibration tool according to claim 1, characterized in that: The calibration hole passes through the calibration plane and the base in sequence from top to bottom.
4. The micro-jet laser calibration tool according to claim 1, characterized in that: The outer edge of the calibration plane is used to calibrate the plane position of the micro-jet water column, and the calibration hole is used to calibrate the Renishaw probe.
5. The micro-jet laser calibration tool according to claim 1, characterized in that: The upper surface of the calibration plane is a height reference plane, and the flatness of the upper surface of the calibration plane is less than 0.005 mm.
6. The micro-jet laser calibration tool according to claim 1, characterized in that: The fixing seat is provided with a plurality of adjustment slots, and the fixing seat is fixed on the machine tool workbench through the plurality of adjustment slots.
7. The micro-jet laser calibration tool according to claim 6, characterized in that: The adjustment grooves are strip-shaped grooves, and at least two of the strip-shaped grooves are symmetrically distributed on both sides of the fixing seat.
8. The micro-jet laser calibration tool according to claim 1, characterized in that: The parallelism between the upper surface of the calibration plane and the lower surface of the fixing seat is less than 0.005 mm.