Coordinate calculation method for multi-station clamp of vertical machining center

Abstract

A method for calculating coordinates of a multi-station fixture of a vertical machining center comprises the following steps: determining a reference point of the fixture and a plurality of stations on the fixture, and measuring the distance between the plurality of stations and the reference point of the fixture to obtain a linear relation between origin coordinates of the plurality of stations and reference coordinates; according to the linear relation between the reference point of the clamp and the zero point of each station, the station zero point coordinate is determined; the linear relation serves as a reference, conversion of a plurality of station coordinate systems is carried out when a machining program is compiled, and the machining zero point of the workpiece to be machined is determined; the clamp is installed on the vertical machining center, and mechanical coordinates of the clamp datum point on the vertical machining center are collected; and inputting the collected mechanical coordinate value of the reference point of the clamp into a vertical machining center system. By means of the method, conversion between the reference coordinate system and the station coordinate system is achieved, on the basis, only coordinate data of the reference original point need to be collected and input into the vertical machining center system when the clamp is replaced every time, and the method is simple in operation step, rapid and high in accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a method for calculating coordinates of a multi-station fixture of a vertical machining center. Background Art

[0002] The machining center is a comprehensive CNC machining equipment, which generally includes a tool magazine, a guide mechanism, a fixture, a chip blowing mechanism, etc. Among them, the fixture plays a very important role in the equipment. According to the action mode, the fixture can be divided into manual fixtures, pneumatic (hydraulic) fixtures and electric fixtures. No matter which type of fixture, its function is to clamp and position the workpiece so that milling, drilling and boring can be completed smoothly. When using the multi-station fixture of the vertical machining center, each station needs to collect coordinates and then enter them into the coordinate system used by the station in the machining center. Since the machining center is a multi-product co-production, as long as the product is changed, the positioning fixture must be replaced, and the zero-point coordinates of each station must be manually collected again each time. If the clamping parts or other parts interfere during the coordinate collection process, the interfering parts need to be removed; if the positioning reference of the station is in an angled tilted state, it is necessary to collect and process the parts multiple times until the parts are qualified, which is time-consuming and laborious. Now a method is needed to simplify coordinate collection and solve the problem of inaccurate coordinate collection. Summary of the invention

[0003] In order to overcome the above shortcomings, the present invention provides a method for calculating the coordinates of a multi-station fixture of a vertical machining center.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A method for calculating coordinates of a multi-station fixture of a vertical machining center comprises the following steps: Step 1, determining a reference point of the fixture and a plurality of workstations on the workpiece, and measuring the distances of the plurality of workstations from the reference point of the fixture to obtain a linear relationship between the origin coordinates of the plurality of workstations and the reference coordinates; Step 2: Determine the linear relationship by the distance between the reference point of the fixture and the workstation; Step 3: Taking the linear relationship as a reference, convert multiple workstation coordinate systems when compiling the machining program to determine the machining coordinates of the workpiece to be machined; Step 4: Install the fixture on the vertical machining center and collect the mechanical coordinates (X0, Y0, Z0) of the fixture reference point on the vertical machining center; Step 5: Input the collected mechanical coordinate values ​​of the fixture reference points into the vertical machining center system.

[0005] Further optimized, the method of converting the multiple coordinate systems is specifically as follows: the coordinate systems of the multiple workstations all adopt the coordinate system of the reference point, and when programming, the coordinate origin is converted by substituting a linear relationship with the reference point to obtain the workstation coordinates for processing the workpiece.

[0006] Further optimized, the linear relationship includes rectangular arrangement coordinate calculation and circular arrangement coordinate calculation of multiple workstations, the multiple workstations are calibrated as Ⅰ, Ⅱ, Ⅲ...N, and the coordinate calibration of each workstation is (Xn, Yn, Zn), where n≥1.

[0007] Further optimization, the calculation method of the specific coordinate transformation of the rectangular arrangement coordinates is: ⅠStation zero point coordinate: X Ⅰ =X0-X1,Y Ⅰ =Y0+Y,Z Ⅰ = Z0; Ⅱ Station zero point coordinate: X Ⅱ =X0-X2,Y Ⅱ =Y0+Y,Z Ⅱ =Z0+Z2; III Station zero point coordinate: X Ⅲ =X0+X3,Y Ⅲ =Y0+Y,Z Ⅲ =Z0+Z3; IV Station zero point coordinate: X Ⅳ =X0+X4,Y Ⅳ =Y0+Y,Z Ⅳ = Z0-Z4; … N station zero point coordinate: X N =X0±X N , Y N =Y0±Y N , Z N =Z0±Z N .

[0008] Further optimization, the calculation method of the specific coordinate transformation of the annular arrangement coordinates is: ⅠStation zero point coordinate: X Ⅰ =X0,Y Ⅰ =Y0+Y1,Z Ⅰ =Z0+Z1; Ⅱ Station zero point coordinate: X Ⅱ =X0+X2,Y Ⅱ =Y0+Y2,Z Ⅱ = Z0-Z2; III Station zero point coordinate: X Ⅲ =X0-X3,Y Ⅲ =Y0+Y3,ZⅢ =Z0+Z3; … N station zero point coordinate: X N =X0±X N , Y N =Y0±Y N , Z N =Z0±Z N .

[0009] The beneficial effects of the present invention are: By designing the reference origin of the fixture and actually measuring the distance between each workstation positioning zero point and the reference origin, the linear relationship between the workstation zero point coordinates and the reference origin is determined. The position of the workstation is determined by the linear relationship to achieve the conversion between the reference coordinate system and the workstation coordinate system. After the above-mentioned prerequisites are determined to be unchanged, each time the workpiece is replaced, only the coordinate data of the reference origin needs to be collected, and the zero point coordinates of each workstation can be obtained by calculation. The method has simple operation steps, is fast and has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of X and Y axis measurement in the (X, Y) plane in the rectangular arrangement of the multi-station fixture; Figure 2 It is a schematic diagram of the structure of Z-axis measurement in a rectangular arrangement of multi-station fixtures; Figure 3 It is a schematic diagram of the structure of X and Y axis measurement in the (X, Y) plane in the circular arrangement of the multi-station fixture; Figure 4 This is a schematic diagram of the structure for Z-axis measurement in a circular arrangement of a multi-station fixture. DETAILED DESCRIPTION

[0011] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is described in detail below in conjunction with specific embodiments. The following embodiments are implemented based on the technical solutions of the present invention, and detailed implementation methods and specific operating procedures are given. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the following embodiments.

[0012] A method for calculating coordinates of a multi-station fixture of a vertical machining center comprises the following steps: Step 1: Determine the reference point of the fixture and multiple workstations on the workpiece. The multiple workstations are calibrated as I, II, III, ... N, the coordinates of each station are calibrated as (Xn, Yn, Zn), where n ≥ 1, and the distances of multiple stations from the fixture reference point are measured to obtain the linear relationship between the origin coordinates of multiple stations and the reference coordinates; Step 2: Determine the workstation coordinates through the linear relationship between the fixture's reference point and the workstation; Step 3: Taking the linear relationship as a reference, convert multiple workstation coordinate systems when compiling the machining program to determine the machining coordinates of the workpiece to be machined; Step 4: Install the fixture on the vertical machining center and collect the mechanical coordinates (X0, Y0, Z0) of the fixture reference point on the vertical machining center; Step 5: Input the collected mechanical coordinate values ​​of the fixture reference points into the vertical machining center system.

[0013] In the present invention, the linear relationship includes the rectangular arrangement coordinate calculation and the circular arrangement coordinate calculation of multiple workstations, and each time the production is changed, only step four needs to be operated, and the remaining steps do not need to be changed each time the clamp is changed after the first debugging.

[0014] As shown in the figure, an example of a rectangular arrangement of a multi-station fixture includes: the reference origin coordinates (X0, Y0, Z0), the zero point coordinates of the first station (X Ⅰ , Y Ⅰ , Z Ⅰ ), II station zero point coordinate (X Ⅱ , Y Ⅱ , Z Ⅱ )、Ⅲ station zero point coordinate (X Ⅲ , Y Ⅲ , Z Ⅲ ), zero point coordinate of IV station (X Ⅳ , Y Ⅳ , Z Ⅳ ).

[0015] As shown in the figure, an example of a multi-station fixture circular arrangement includes: reference origin coordinates (X0, Y0, Z0), I station zero point coordinates (X Ⅰ , Y Ⅰ , Z Ⅰ ), II station zero point coordinate (X Ⅱ , Y Ⅱ , Z Ⅱ )、Ⅲ station zero point coordinate (X Ⅲ , Y Ⅲ , Z Ⅲ ).

[0016] When the fixture leaves the factory, the actual distance between the positioning zero point of each station and the reference origin in the X, Y, and Z directions is accurately measured to 0.001. The distances in the diagram are all actual measured dimensions.

[0017] Collect the coordinates of the reference origin (X0, Y0, Z0).

[0018] The calculation method of the present invention is as follows: An example of a rectangular arrangement of a multi-station fixture, with 4 stations, marked as Ⅰ, Ⅱ, Ⅲ, and Ⅳ. In this example, the arrow direction in the figure is taken as positive. The calculation method is: ⅠStation zero point coordinate: X Ⅰ =X0-X1,Y Ⅰ =Y0+Y,Z Ⅰ = Z0; Ⅱ Station zero point coordinate: X Ⅱ =X0-X2,Y Ⅱ =Y0+Y,Z Ⅱ =Z0+Z2; III Station zero point coordinate: X Ⅲ =X0+X3,Y Ⅲ =Y0+Y,Z Ⅲ =Z0+Z3; IV Station zero point coordinate: X Ⅳ =X0+X4,Y Ⅳ =Y0+Y,Z Ⅳ =Z0-Z4.

[0019] An example of a multi-station clamp arranged in a ring, with 3 stations, marked as Ⅰ, Ⅱ, and Ⅲ. In this example, the arrow direction in the figure is taken as positive. The calculation method is: ⅠStation zero point coordinate: X Ⅰ =X0,Y Ⅰ =Y0+Y1,Z Ⅰ =Z0+Z1; Ⅱ Station zero point coordinate: X Ⅱ =X0+X2,Y Ⅱ =Y0+Y2,Z Ⅱ = Z0-Z2; III Station zero point coordinate: X Ⅲ =X0-X3,Y Ⅲ =Y0+Y3,Z Ⅲ =Z0+Z3.

[0020] By designing the reference origin of the fixture and actually measuring the distance between each workstation positioning zero point and the reference origin, the linear relationship between the workstation zero point coordinates and the reference origin is determined. The position of the workstation is determined by the linear relationship to achieve the conversion between the reference coordinate system and the workstation coordinate system. After the above-mentioned prerequisites are determined to be unchanged, each time the workpiece is replaced, only the coordinate data of the reference origin needs to be collected and input into the vertical machining center system. This method has simple operation steps, is fast and has high accuracy.

[0021] The above shows and describes the main features, methods of use, basic principles and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements according to actual conditions, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for calculating the coordinates of a multi-station fixture in a vertical machining center, characterized in that: The following steps are involved: Step 1: determine the reference point of the fixture and multiple workstations on the workpiece, and measure the distances between the multiple workstations and the reference point of the fixture to obtain a linear relationship between the origin coordinates of the multiple workstations and the reference coordinates; Step 2: Determine the linear relationship by the distance between the reference point of the fixture and the workstation; Step 3: Taking the linear relationship as a reference, convert multiple workstation coordinate systems when compiling the machining program to determine the machining coordinates of the workpiece to be machined; Step 4: Install the fixture on the vertical machining center and collect the mechanical coordinates (X0, Y0, Z0) of the fixture reference point on the vertical machining center; Step 5: Input the collected mechanical coordinate values ​​of the fixture reference points into the vertical machining center system.

2. A method for calculating coordinates of a vertical center multi-station fixture as claimed in claim 1, characterized in that: The method for converting the multiple coordinate systems is specifically as follows: the coordinate systems of the multiple stations all adopt the coordinate system of the reference point, and during programming, the coordinate origin is converted by substituting a linear relationship with the reference point to obtain the station coordinates for processing the workpiece.

3. A method for calculating coordinates of a vertical center multi-station fixture as claimed in claim 1, characterized in that: The linear relationship includes rectangular arrangement coordinate calculation and circular arrangement coordinate calculation of multiple workstations, the multiple workstations are calibrated as Ⅰ, Ⅱ, Ⅲ...N, and the coordinate calibration of each workstation is (Xn, Yn, Zn), where n≥1.

4. A method for calculating coordinates of a vertical center multi-station fixture as claimed in claim 3, characterized in that: The specific coordinate conversion calculation method of the rectangular arrangement coordinates is: ⅠStation zero point coordinate: X Ⅰ =X0-X1,Y Ⅰ =Y0+Y,Z Ⅰ = Z0; Ⅱ Station zero point coordinate: X Ⅱ =X0-X2,Y Ⅱ =Y0+Y,Z Ⅱ =Z0+Z2; III Station zero point coordinate: X Ⅲ =X0+X3,Y Ⅲ =Y0+Y,Z Ⅲ =Z0+Z3; IV Station zero point coordinate: X Ⅳ =X0+X4,Y Ⅳ =Y0+Y,Z Ⅳ =Z0-Z4. …… N station zero point coordinate: X N =X0±X N , Y N =Y0±Y N , Z N =Z0±Z N .

5. A method for calculating coordinates of a vertical center multi-station fixture as claimed in claim 3, characterized in that: The calculation method for the specific coordinate transformation of the annular arrangement coordinates is: ⅠStation zero point coordinate: X Ⅰ =X0,Y Ⅰ =Y0+Y1,Z Ⅰ =Z0+Z1; Ⅱ Station zero point coordinate: X Ⅱ =X0+X2,Y Ⅱ =Y0+Y2,Z Ⅱ =Z0-Z2; III Station zero point coordinate: X Ⅲ =X0-X3,Y Ⅲ =Y0+Y3,Z Ⅲ =Z0+Z3. …… N station zero point coordinate: X N =X0±X N , Y N =Y0±Y N , Z N =Z0±Z N .

Images