Workpiece coordinate origin alignment tool and round workpiece coordinate origin alignment method
By designing a workpiece coordinate origin alignment fixture and utilizing the combination of dovetail groove and threaded screw, the problems of small alignment range, long time, low accuracy and poor versatility in the existing technology are solved, and efficient and stable workpiece coordinate origin alignment is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN AEROSPACE TIMES PRECISION ELECTROMECHANICAL CO LTD
- Filing Date
- 2025-12-15
- Publication Date
- 2026-04-17
AI Technical Summary
Existing manual alignment methods have a small alignment range, long adjustment time, low accuracy, and are difficult to control, while automatic alignment methods have poor versatility and cannot be applied to various processing equipment.
A workpiece coordinate origin alignment fixture was designed, including a spindle chuck, an upper slide rail, a lower slide rail, and a threaded screw. Sliding is achieved through the cooperation of dovetail groove and dovetail tenon. A lever mounting hole and a tension groove are provided. The threaded screw is used to fine adjust the rotation radius and clamping force, and it is suitable for a variety of processing equipment.
It improves alignment accuracy and efficiency, reduces modification costs, adapts to more workpiece specifications, avoids the shortcomings of traditional methods, and achieves high-precision and fast coordinate origin alignment.
Smart Images
Figure CN121870544A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a tool and method for detecting specific positions in a workpiece, specifically to a workpiece coordinate origin alignment fixture and a method for aligning the coordinate origin of a circular workpiece. Background Technology
[0002] Coordinate origin alignment (also known as "tool setting / workpiece origin setting") is the process of establishing the coordinate system relationship between the workpiece and the machine tool through a detection tool. Before precision milling, it is necessary to align the workpiece coordinate origin.
[0003] Currently, there are two main methods for aligning the workpiece coordinate origin: manual alignment and automatic alignment.
[0004] The manual alignment method requires fixing the lever gauge in a rotary gauge holder, then mounting the holder to the machine tool spindle via a magnetic attraction device. Moving the machine tool or gauge holder ensures the lever gauge probe is perpendicular to the workpiece's reference surface, guaranteeing a tight and unobstructed contact. The machine tool spindle is then manually rotated (or the worktable moved), and the lever gauge pointer's movement is observed. The workpiece's clamping position is adjusted until the pointer movement is less than or equal to 0.002 mm. After completing the reference surface calibration, the coordinate origin is set. This clamping method suffers from drawbacks such as a small alignment range, long adjustment time, and low alignment accuracy. Furthermore, the degree of lever gauge probe clamping is difficult to control during the alignment process.
[0005] Automatic alignment methods require installing probes on CNC machine tools. Through basic probe control commands integrated into the CNC machine tool system, the probes are controlled to detect and collect features such as points, holes, shafts, and grooves according to a preset program. The measured results are fed back to the machine tool, and then, through a certain algorithm, the required offset values for position, angle, etc., are obtained. Finally, automatic adjustments are made to achieve automatic workpiece alignment. However, automatic alignment methods have poor versatility and cannot be used for manual milling equipment or probeless milling and boring equipment. Summary of the Invention
[0006] The purpose of this invention is to solve the technical problems in the prior art where, during manual alignment, the dial indicator clamp is magnetically attached to the spindle, resulting in a small alignment range, long adjustment time, low alignment accuracy, and difficulty in controlling the clamping degree of the lever dial indicator probe, as well as the poor versatility of automatic alignment methods. This invention provides a workpiece coordinate origin alignment fixture and a method for aligning the coordinate origin of a circular workpiece.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: A workpiece coordinate origin alignment fixture, characterized in that it includes a spindle chuck, an upper slide rail, a lower slide rail, and a threaded screw. The bottom of the upper slide rail is provided with a dovetail groove along its axial direction, and the top surface of the lower slide rail is provided with a dovetail tenon that matches the dovetail groove, so that the lower slide rail can slide relative to the upper slide rail. On the dovetail tenon at one end of the lower slide rail, a first lever gauge mounting hole is provided along its axial direction. The bottom surface of the lower slide rail is provided with a through second lever gauge mounting hole from bottom to top for mounting a lever gauge. The first lever gauge mounting hole and the second lever gauge mounting hole are perpendicular to each other and connected at the connection point. A tensioning groove is provided on one end of the lower slide rail, which passes through its top and bottom surfaces. The tensioning groove passes through the axis of the first lever mounting hole and penetrates the inner wall of the second lever mounting hole, so as to divide one end of the lower slide rail into two independent tensioning ends. On the dovetail tenon at the other end of the lower slide rail, a first threaded hole is provided along its axial direction. One end of the threaded screw is connected to the lower slide rail through the first threaded hole, and the inner sidewall of the other end abuts against the sidewall of the upper slide rail. By rotating the threaded screw, the lower slide rail slides relative to the upper slide rail. The spindle chuck is located on top of the upper slide rail, with one end detachably connected to the upper slide rail and the other end detachably connected to the spindle of an external processing device.
[0008] Furthermore, grooves are provided on one end and the bottom end face of the lower slide rail to accommodate the lever gauge.
[0009] Furthermore, the workpiece coordinate origin alignment fixture also includes a lever gauge locking screw; Both tensioning ends are provided with second threaded holes, and the lever gauge locking screws lock the two tensioning ends through the second threaded holes to fix the lever gauge.
[0010] Furthermore, the workpiece coordinate origin alignment fixture also includes a pressure plate, which is connected to the upper slide rail by pressure plate fixing screws, and the inner side wall of the other end of the threaded screw abuts against the side wall of the pressure plate.
[0011] Furthermore, the upper slide rail has two threaded holes, and the spindle chuck is connected to the upper slide rail through the threaded holes.
[0012] Meanwhile, the present invention also provides a method for aligning the origin of a circular workpiece coordinate system, which is characterized by including the following steps: Step 1: Prepare a workpiece coordinate origin alignment fixture as described above; Step 2: Clamp the spindle chuck onto the tool holder pull tube of the external machining equipment, and then clamp the tool holder pull tube onto the external machining equipment. Step 3: Obtain a circular workpiece to be processed, place the workpiece on the processing position of the external processing equipment, determine the diameter of the workpiece, determine the processing rotation radius of the workpiece coordinate origin alignment fixture based on the workpiece diameter, and then determine the installation position of the lever gauge. Step 4: Obtain the lever gauge and install it into the lever gauge installation position determined in Step 3; Step 5: Place the probe of the lever gauge into contact with the surface of the workpiece to be measured, and fine-tune the lead screw to make the preset clamping force of the probe F. Step 6: Set the dial of the lever indicator to 0 and rotate the workpiece 360°. If the dial indicator remains at 0, the coordinate origin of the circular workpiece is now aligned. If the dial indicator has at least two positions that are not at 0, proceed to step 7. Step 7: Select any non-zero mark position and adjust the placement of the workpiece so that the dial mark is at zero. Then rotate the workpiece 360° again. Step 8: Observe the changes in the dial scale. If the dial scale always remains at 0, the coordinate origin of the circular workpiece is calibrated. If the dial scale has at least two positions that are not at 0, return to step 7 until the dial scale always remains at 0, thus completing the coordinate origin calibration of the circular workpiece.
[0013] Furthermore, in step 5, the preset clamping force F is within the range of 0.02mm≤F≤0.2mm.
[0014] Furthermore, in step 4, the leverage table is a leverage per mille table.
[0015] The beneficial effects of this invention are: 1. The present invention provides a workpiece coordinate origin alignment fixture. By using a dovetail groove and dovetail tenon joint between the upper and lower slide rails, the sliding becomes smoother. Furthermore, a first lever gauge mounting hole is provided along the axial direction on the dovetail tenon at one end of the lower slide rail, and a second lever gauge mounting hole is provided on its bottom surface. This allows for the installation of both vertical and horizontal lever gauges, increasing the rotation radius of the workpiece coordinate origin alignment fixture and enabling it to adapt to the origin alignment work of workpieces of more specifications.
[0016] 2. The present invention provides a workpiece coordinate origin alignment fixture, which makes the installation of the lever gauge more stable by making the first lever gauge mounting hole and the second lever gauge mounting hole perpendicular to each other and connected at the connection point, and by providing a tensioning groove through the top and bottom surfaces of the lower slide rail, thereby preventing the lever gauge from shaking and reducing the workpiece coordinate origin alignment accuracy.
[0017] 3. The present invention provides a workpiece coordinate origin alignment fixture. By setting a threaded screw and rotating the threaded screw, the lower slide rail slides relative to the upper slide rail, thereby finely adjusting the rotation radius of the workpiece coordinate origin alignment fixture and adjusting the clamping force of the lever gauge probe on the workpiece to prevent excessive clamping force from causing deformation of thin-walled workpieces or displacement of high-precision machined workpieces, which would affect the machining accuracy of the workpiece.
[0018] 4. This invention provides a workpiece coordinate origin alignment fixture with a simple structure, convenient operation, and high versatility. It requires no probe and can be used with common machining centers, CNC and manual milling machines, boring machines, and other equipment. Through simple installation and debugging, it can be integrated into existing machining equipment systems without large-scale modifications, reducing modification costs. Furthermore, it allows for high-precision coordinate origin alignment manually, significantly shortening workpiece alignment time and improving workpiece processing efficiency.
[0019] 5. This invention provides a workpiece coordinate origin alignment fixture. By setting a spindle chuck, the workpiece coordinate origin alignment fixture is installed onto the spindle of the machining equipment. Compared with magnetic installation, this connection method is more stable and reliable, and easier to disassemble. Furthermore, the workpiece coordinate origin alignment fixture maintains good stability after disassembly, and no repeated adjustments are required upon reinstallation. Alignment of similar parts can be directly performed, reducing workpiece coordinate origin alignment time and improving workpiece machining efficiency.
[0020] 6. This invention provides a method for aligning the coordinate origin of a circular workpiece. It is simple to operate, has a short alignment time, and high alignment efficiency. By integrating the spindle chuck with the spindle of the external machining equipment, it achieves good rigidity, eliminating the instability of the lever gauge display caused by vibrations from the external machining equipment due to insufficient connection rigidity, thus preventing instability in the scale display and affecting normal readings. Furthermore, the lever gauge mounting hole can be freely selected according to machining requirements, increasing the alignment stroke. By changing the dimensions of the workpiece coordinate origin alignment fixture, the rotation diameter can be increased from 2mm to 150mm. This effectively avoids the problem of frequently changing alignment fixtures when aligning multiple holes of different sizes on the same workpiece. Simultaneously, the sensitive and quick micro-adjustment of the rotation diameter via the lead screw can also ensure uniform force distribution on the workpiece surface by the lever gauge probe, avoiding damage to the surface of high-precision workpieces caused by traditional hammering alignment methods. It also avoids vibration and deformation problems caused by uneven force distribution during alignment of high-precision thin-walled workpieces. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of an embodiment of a workpiece coordinate origin alignment fixture according to the present invention; Figure 2 This is a three-dimensional structural diagram of the sliding rail in an embodiment of a workpiece coordinate origin alignment fixture of the present invention.
[0022] The attached figures are labeled as follows: 1. Spindle chuck; 2. Upper slide rail; 3. Lower slide rail; 4. Lead screw; 5. Pressure plate; 6. Pressure plate fixing screw; 7. Lever gauge locking screw; 8. Second lever gauge mounting hole; 9. First lever gauge mounting hole; 10. Tensioning groove. Detailed Implementation
[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] like Figure 1-2 As shown, the workpiece coordinate origin alignment fixture provided in this embodiment of the invention includes a spindle chuck 1, an upper slide rail 2, a lower slide rail 3, a threaded screw 4, a pressure plate 5, and a lever gauge locking screw 7. The bottom of the upper slide rail 2 is provided with a dovetail groove along its axial direction, and the top surface of the lower slide rail 3 is provided with a dovetail tenon that matches the dovetail groove, so that the lower slide rail 3 can slide relative to the upper slide rail 2. On the dovetail tenon at one end of the lower slide rail 3, a first lever gauge mounting hole 9 is provided along its axial direction. A second lever gauge mounting hole 8 is provided through the bottom surface of the lower slide rail 3 from bottom to top for mounting the lever gauge. The first lever gauge mounting hole 9 and the second lever gauge mounting hole 8 are perpendicular to each other and connected at the connection point. A tensioning groove 10 is provided on one end of the lower slide rail 3, which passes through the axis of the first lever gauge mounting hole 9 and penetrates the inner wall of the second lever gauge mounting hole 8, so as to divide one end of the lower slide rail 3 into two independent tensioning ends. A second threaded hole is provided on both tensioning ends. The lever gauge locking screw 7 locks the two tensioning ends through the second threaded hole to fix the lever gauge.
[0025] The lower slide rail 3 has grooves on one end and the bottom end face to accommodate the lever gauge. On the dovetail tenon at the other end of the lower slide rail 3, a first threaded hole is provided along its axial direction. One end of the threaded screw 4 is connected to the lower slide rail 3 through the first threaded hole, and the inner side wall of the other end abuts against the side wall of the upper slide rail 2. By rotating the threaded screw 4, the lower slide rail 3 can slide relative to the upper slide rail 2.
[0026] The spindle chuck 1 is located on top of the upper slide rail 2, with one end detachably connected to the upper slide rail 2 and the other end detachably connected to the spindle of an external machining equipment. In this embodiment, the upper slide rail 2 has two threaded holes, through which the spindle chuck 1 is connected to the upper slide rail 2.
[0027] The pressure plate 5 is connected to the upper slide rail 2 by the pressure plate fixing screw 6, and the inner side wall of the other end of the threaded screw 4 abuts against the side wall of the pressure plate 5.
[0028] Meanwhile, the present invention also provides a method for aligning the coordinate origin of a circular workpiece, comprising the following steps: Step 1: Prepare a workpiece coordinate origin alignment fixture as described above; Step 2: Clamp the spindle chuck onto the tool holder pull tube of the external machining equipment, and then clamp the tool holder pull tube onto the external machining equipment. Step 3: Obtain a circular workpiece to be processed, place the workpiece on the processing position of the external processing equipment, determine the diameter of the workpiece, determine the processing rotation radius of the workpiece coordinate origin alignment fixture based on the workpiece diameter, and then determine the installation position of the lever gauge; in this embodiment, the lever gauge is a lever dial indicator. Step 4: Obtain the lever gauge and install it into the lever gauge installation position determined in Step 3; Step 5: Rotate the lead screw 4 so that the probe of the lever gauge contacts the surface to be measured on the workpiece, and fine-tune the lead screw 4 to set the preset clamping force of the probe to F, where the value of F ranges from [value missing]. Step 6: Set the dial of the lever indicator to 0 and rotate the workpiece 360°. If the dial indicator remains at 0, the coordinate origin of the circular workpiece is now aligned. If the dial indicator has at least two positions that are not at 0, proceed to step 7. Step 7: Select any non-zero mark position and adjust the placement of the workpiece so that the dial mark is at zero. Then rotate the workpiece 360° again. Step 8: Observe the changes in the dial scale. If the dial scale always remains at 0, the coordinate origin of the circular workpiece is calibrated. If the dial scale has at least two positions that are not at 0, return to step 7 until the dial scale always remains at 0, then the coordinate origin of the circular workpiece is calibrated.
[0029] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A workpiece coordinate origin alignment fixture, characterized by: Includes a spindle chuck (1), an upper slide rail (2), a lower slide rail (3), and a threaded screw (4); The bottom of the upper slide rail (2) is provided with a dovetail groove along its axial direction, and the top surface of the lower slide rail (3) is provided with a dovetail tenon that matches the dovetail groove, so that the lower slide rail (3) can slide relative to the upper slide rail (2). On the dovetail tenon at one end of the lower slide rail (3), a first lever gauge mounting hole (9) is provided along its axial direction. The bottom surface of the lower slide rail (3) is provided with a through second lever gauge mounting hole (8) from bottom to top for mounting a lever gauge. The first lever gauge mounting hole (9) and the second lever gauge mounting hole (8) are perpendicular to each other and connected at the connection point. The lower slide rail (3) has a tension groove (10) that runs through its top and bottom surfaces. The tension groove (10) passes through the axis of the first lever mounting hole (9) and penetrates the inner wall of the second lever mounting hole (8) to divide one end of the lower slide rail (3) into two independent tension ends. On the dovetail tenon at the other end of the lower slide rail (3), a first threaded hole is provided along its axial direction. One end of the threaded screw (4) is connected to the lower slide rail (3) through the first threaded hole, and the inner side wall of the other end abuts against the side wall of the upper slide rail (2). By rotating the threaded screw (4), the lower slide rail (3) slides relative to the upper slide rail (2). The spindle chuck (1) is located on top of the upper slide rail (2), with one end detachably connected to the upper slide rail (2) and the other end detachably connected to the spindle of an external processing device.
2. The workpiece coordinate origin alignment fixture of claim 1, wherein: The lower slide rail (3) has grooves on one end and the bottom end face to accommodate the lever gauge.
3. The workpiece coordinate origin alignment fixture of claim 1, wherein: It also includes the lever gauge locking screw (7); Both tensioning ends are provided with second threaded holes, and the lever gauge locking screw (7) locks the two tensioning ends through the second threaded holes to fix the lever gauge.
4. The workpiece coordinate origin alignment fixture of claim 1, wherein: It also includes a pressure plate (5), which is connected to the upper slide rail (2) by a pressure plate fixing screw (6), and the inner side wall of the other end of the threaded screw (4) abuts against the side wall of the pressure plate (5).
5. The workpiece coordinate origin alignment fixture of claim 1, wherein: The upper slide rail (2) has two threaded holes, and the spindle chuck (1) is connected to the upper slide rail (2) through the threaded holes.
6. A method of aligning the origin of coordinates of a circular workpiece, characterized in that, Includes the following steps: Step 1: Prepare a workpiece coordinate origin alignment fixture as described in claim 1; Step 2: Clamp the spindle chuck onto the tool holder pull tube of the external machining equipment, and then clamp the tool holder pull tube onto the external machining equipment. Step 3: Obtain a circular workpiece to be processed, place the workpiece on the processing position of the external processing equipment, determine the diameter of the workpiece, determine the processing rotation radius of the workpiece coordinate origin alignment fixture based on the workpiece diameter, and then determine the installation position of the lever gauge. Step 4: Obtain the lever gauge and install it into the lever gauge installation position determined in Step 3; Step 5: Place the probe of the lever gauge into contact with the surface of the workpiece to be measured, and finely adjust the threaded screw (4) to make the preset clamping force of the probe F; Step 6: Set the dial of the lever indicator to 0 and rotate the workpiece 360°. If the dial indicator remains at 0, the coordinate origin of the circular workpiece is now aligned. If the dial indicator has at least two positions that are not at 0, proceed to step 7. Step 7: Select any non-zero mark position and adjust the placement of the workpiece so that the dial mark is zero. Then rotate the workpiece 360° again. Step 8: Observe the changes in the dial scale. If the dial scale always remains at 0, the coordinate origin of the circular workpiece is calibrated. If the dial scale has at least two positions that are not at 0, return to step 7 until the dial scale always remains at 0, then the coordinate origin of the circular workpiece is calibrated.
7. The method for aligning the origin of a circular workpiece coordinate system according to claim 6, characterized in that: In step 5, the preset pressing force F has a value range of .
8. The method of claim 6, wherein: In step 4, the leverage table is a leverage per mille table.