Clamp measurement base plate flatness adjustment device and method

Abstract

The present application relates to a kind of fixture measurement base plate flatness adjusting device and method, adjusting device is by Base plate, multiple measuring blocks and adjusting shim constitute, the thickness of multiple adjusting shims between each measuring block and Base plate, total is 3mm.The present application is designed to increase multiple adjustable measuring blocks on fixture, according to the size of fixture determines the number of measuring block, cover the measurement range of fixture, when measuring system of fixture precision, with measuring block instead of Base plate, by adjusting the shim of measuring block, ensure that flatness is within tolerance, so as to ensure the measurement accuracy of fixture;Make the flatness of fixture Base plate realize flexible adjustment, not dependent on the original base plate flatness, break through the original inherent state of establishment;For large fixture, turnover fixture, slide table fixture etc., when measuring precision, can improve the efficiency of measurement, save the cost of hoisting equipment, save adjustment time, easy and fast operation, save time and effort, ensure the measurement accuracy of fixture.

Description

Technical Field

[0001] This invention belongs to the field of fixture technology, specifically relating to a fixture measurement system base plate flatness adjustment device and method. Background Technology

[0002] Currently, when establishing a precision measurement system for large fixtures and rotary table fixtures, such as side panel assembly fixtures, floor assembly fixtures, four-door fixtures, front cover fixtures, and rear cover fixtures, the base flatness is out of tolerance (standard ±0.1mm). Adjusting the flatness is very difficult, requiring equipment such as forklifts, cranes, and hoists, which is time-consuming, costly, and labor-intensive.

[0003] In addition, the fixture is a fixed fixture. When establishing the precision measurement system of the slide fixture, if the flatness of the base plate is out of tolerance, it cannot be adjusted. The establishment will bring measurement errors to the fixture, thus affecting the accuracy of the vehicle body dimensions.

[0004] At the same time, during the spot checks of the precision of the fixtures for mass-produced vehicles, the base plate of the fixtures may show slight torsional deformation after a few years, and it is difficult to ensure that the flatness is within the tolerance. Summary of the Invention

[0005] The purpose of this invention is to provide a fixture measurement system base plate flatness adjustment device and a fixture measurement system base plate flatness adjustment method to solve the problem of ensuring fixture measurement accuracy.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A fixture measurement system base plate flatness adjustment device consists of a base plate, multiple measuring blocks, and multiple adjustment shims.

[0008] The Base plate has multiple threaded holes for fixing the fixture base, connecting plate, cylinder, positioning block and positioning pin;

[0009] The multiple measuring blocks are all mounted on the Base plate, which is used to collect measuring points and establish a coordinate system for measuring flatness during fixture accuracy measurement.

[0010] The gap between each measuring block and the base plate is adjusted using adjusting shims, and the adjusting shims are locked with bolts to achieve flexible adjustment, so that the flatness of several measuring blocks is within ±0.1mm;

[0011] Multiple adjustment shims are initially set between each measuring block and the base plate, with a total thickness of 3mm for all adjustment shims.

[0012] Furthermore, the Base plate is the fixture base and is machined as a single piece. The fixture base, connecting plate, cylinder, positioning block and positioning pin are fixed to the Base plate by bolts.

[0013] Furthermore, the Base board has dimensions of 2m × 5m.

[0014] Furthermore, the measuring block has four through holes, and the measuring block is fixed to the base plate by four bolts.

[0015] Furthermore, the number of measuring blocks is determined according to the size of the fixture, ensuring that the measuring range of the fixture can cover the entire fixture body.

[0016] Furthermore, the measuring block has a size of 50mm × 50mm, which is the same as the size of the adjusting shim.

[0017] Furthermore, the thickness of the adjusting shim can be set to 0.1mm, 0.2mm, 0.5mm and 1.0mm.

[0018] 8. A method for adjusting the flatness of a base plate for fixture measurement, characterized by comprising the following steps:

[0019] A. Design and install multiple adjustable measuring blocks on the fixture to cover the measuring range of the fixture;

[0020] B. When establishing a system for fixture accuracy measurement, use a measuring block instead of a base plate;

[0021] C. Set adjustment shims between the measuring block and the base plate;

[0022] D. Adjust the shims of the measuring block to ensure that the flatness is within the tolerance, i.e., ±0.1mm.

[0023] Further, in step C, six adjustment shims are set between each measuring block and the base plate. The thicknesses of the adjustment shims are two 1mm shims, one 0.5mm shim, two 0.2mm shims, and one 0.1mm shim.

[0024] Further, in step D, a portable coordinate measuring machine is used to adjust the height of all measuring blocks. By adding or subtracting shims, the flatness is ensured to be within ±0.1mm. The three-two-one coordinate system is established using a point-line-plane coordinate system. After the system is established, the fixture is measured.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. This invention adds multiple adjustable measuring blocks to the fixture. The number of measuring blocks is determined according to the size of the fixture to cover the measuring range of the fixture. When establishing the fixture accuracy measurement system, the measuring blocks are used instead of the base plate. By adjusting the shims of the measuring blocks, the flatness is ensured to be within the tolerance (standard: ±0.1mm), thereby ensuring the measurement accuracy of the fixture.

[0027] 2. This invention enables flexible adjustment of the flatness of the fixture base plate, which is independent of the original flatness of the base plate and breaks through the inherent state of the original system.

[0028] 3. When measuring the accuracy of large clamps, flip clamps, slide clamps and fixed clamps, this invention can greatly improve the measurement efficiency, save the cost of lifting equipment, save adjustment time, and make the operation simple and quick, saving time and effort while ensuring the measurement accuracy of the clamps. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the fixture measurement and base plate flatness adjustment device of the present invention;

[0031] Figure 2 A schematic diagram of the measuring block. Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments:

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Currently, many fixtures have inclined base plates, and some large flipping fixtures also have these structures, which are not conducive to adjusting the flatness of the fixture. Since flatness is required to be within ±0.1mm during measurement, if the flatness of the fixture's base plate exceeds the tolerance, a calibration cannot be established, leading to inaccurate measurements of the locating pin surfaces on the base plate. If adjusting shims are directly added to the base plate, for large fixtures, a crane is needed to lift them during testing to add or remove shims, which is time-consuming and labor-intensive. Furthermore, if the flatness of the base plate is inaccurate, such as 0.8mm, the measurements of the locating pin surfaces will also be inaccurate, affecting the body accuracy of the white body.

[0036] This invention utilizes an adjustable shim to adjust the flatness of a floating, adjustable measuring block mounted on a base plate, ensuring the flatness is within ±0.1 mm and guaranteeing successful rigging. The fixture-based rigging base plate flatness adjustment device of this invention consists of a base plate, a measuring block, and adjustable shims.

[0037] The base plate serves as the fixture foundation and is machined as a single piece. Multiple threaded holes are present on the base plate for securing the fixture base, connecting plate, cylinder, positioning block, and positioning pins. These components are bolted to the base plate. For large fixtures, the base plate is approximately 2m x 5m. Small base plates are approximately 2m x 2m.

[0038] The measuring block is mounted on the base plate. Specifically, the measuring block has four through holes and is fixed to the base plate with four bolts. It is used for measuring the accuracy of the fixture by taking measurement points on it and establishing a coordinate system for flatness measurement. Multiple measuring blocks are used, the number depending on the size of the fixture. The arrangement of the measuring blocks is not fixed and depends on the size of the fixture, ensuring that the measurement range of the fixture covers the entire fixture body. When fixing the measuring blocks, ensure they are horizontally and vertically aligned, i.e., the Z-axis coordinates are the same (e.g., all 200), and the X-axis coordinates are the same (e.g., all 300).

[0039] Specifically, the measuring block has a size of 50mm × 50mm, which is the same as the size of the adjusting shim.

[0040] The gap between the measuring block and the base plate is adjusted using adjusting shims. The adjusting shims are tightened with bolts to achieve flexible adjustment, so that the flatness of the measuring blocks is within ±0.1mm.

[0041] Specifically, depending on the actual situation, multiple adjustment shims are initially set between each measuring block and the base plate, with a total thickness of 3mm. The thickness of the adjustment shims can be set to 0.1mm, 0.2mm, 0.5mm, and 1.0mm. By adding or subtracting shims, the flatness of the base plate can be kept within ±0.1mm.

[0042] When leveling, use the articulated arm (portable coordinate measuring machine) to check the flatness of the adjustment shims.

[0043] The key point of this invention is to break through the original state and measure the flatness on the fixture base plate. In particular, the flatness adjustment of the base plate of large fixtures, flip fixtures, slide fixtures and fixed fixtures is very difficult, and some cannot be adjusted. This invention is of great significance for the method of adjusting the flatness of the fixture base plate.

[0044] This invention innovatively adds multiple measuring blocks to the fixture design, with adjustment shims underneath the measuring blocks for flexible adjustment. Measurement points are taken on the measuring blocks to ensure flatness within ±0.1mm, and a coordinate system is established to ensure the measurement accuracy of the fixture.

[0045] The method for adjusting the flatness of the base plate for measuring the fixture of the present invention includes the following steps:

[0046] 1. Add multiple adjustable measuring blocks to the fixture to cover the fixture's measurement range;

[0047] 2. When establishing a system for fixture accuracy measurement, use a measuring block instead of a base plate;

[0048] 3. Install adjustment shims between the measuring block and the base plate;

[0049] 4. Adjust the shims of the measuring block to ensure that the flatness is within the tolerance (standard: ±0.1mm).

[0050] Example 1

[0051] like Figure 1 As shown, a fixture measurement system base plate flatness adjustment device consists of a base plate, a measuring block, and an adjustment shim.

[0052] The base plate is machined as a single piece and has multiple threaded holes for fixing the fixture base, connecting plate, cylinder, positioning block, and positioning pin. These components are fixed to the base plate with bolts. In this embodiment, the large fixture has a base plate of approximately 2m × 5m.

[0053] The measuring blocks are fixed to the base plate by four bolts. They are used to take measurement points on the base plate during fixture accuracy measurement to establish a coordinate system for flatness measurement. In this embodiment, there are eight measuring blocks.

[0054] The measuring block has a size of 50mm × 50mm, which is the same as the size of the adjusting shim.

[0055] The gap between the measuring block and the base plate is adjusted using adjusting shims, which are then locked with bolts to achieve flexible adjustment, ensuring that the flatness of the measuring blocks is within ±0.1mm.

[0056] Six shims can be placed between each measuring block and the base plate, with a total thickness of 3mm for all shims. The thicknesses of the shims are 0.1mm, 0.2mm, 0.5mm, and 1.0mm, respectively. By adding or subtracting shims, the flatness of the base plate can be maintained within ±0.1mm.

[0057] A method for adjusting the flatness of a fixture measurement base plate includes the following steps:

[0058] 1. Fix the 8 measuring blocks to the base plate with bolts, each measuring block is fixed with 4 bolts. When fixing the measuring blocks, ensure that they are horizontally and vertically aligned, that is, the Z and X axes are the same. Cover the entire measuring block with positioning pins and positioning surfaces.

[0059] 2. When establishing the measurement system for fixture accuracy, use measuring blocks instead of the base plate. Use an articulated arm (portable coordinate measuring machine, Faro device) to inspect the measuring blocks. The portable coordinate measuring machine can be fixed to the fixture base plate using suction cups to measure the gaps in the fixture. For tilting or flipping fixtures, use a tripod for fixation. Use a point-line-plane 321 system to establish the measurement system, first measuring the flatness. Since the measuring blocks have different heights, for example, the first measuring block is 0.2mm high and the second measuring block is 0.3mm low, adjust the height of the measuring blocks by subtracting 0.2mm from the first measuring block and adding 0.3mm to the second measuring block, continuously adjusting the height of the measuring blocks until they are adjusted towards zero.

[0060] 3. Set 6 adjustment shims between each measuring block and the base plate. The thicknesses of the adjustment shims are 2 x 1mm, 1 x 0.5mm, 2 x 0.2mm, and 1 x 0.1mm.

[0061] 4. Adjust the height of all measuring blocks using the articulated arm (portable coordinate measuring machine), specifically by adding or subtracting shims to ensure flatness is within ±0.1mm. Establish the coordinate system using the 3-2-1 method (three points define a plane, two reference points define a straight line, and the reference origin), and then measure the fixture.

[0062] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A fixture measurement system base plate flatness adjustment device, characterized in that: It consists of a base plate, multiple measuring blocks, and multiple adjusting shims; The Base plate has multiple threaded holes for fixing the fixture base, connecting plate, cylinder, positioning block and positioning pin; The multiple measuring blocks are all mounted on the Base plate, which is used to collect measuring points and establish a coordinate system for measuring flatness during fixture accuracy measurement. The gap between each measuring block and the base plate is adjusted using adjusting shims, and the adjusting shims are locked with bolts to achieve flexible adjustment, so that the flatness of several measuring blocks is within ±0.1mm; Multiple adjustment shims are initially set between each measuring block and the base plate, with a total thickness of 3mm for all adjustment shims.

2. The fixture measurement system base plate flatness adjustment device according to claim 1, characterized in that: The Base plate serves as the fixture base and is machined as a single piece. The fixture base, connecting plate, cylinder, positioning block, and positioning pin are fixed to the Base plate with bolts.

3. The fixture measurement system base plate flatness adjustment device according to claim 1, characterized in that: The Base board measures 2m × 5m.

4. The fixture measurement system base plate flatness adjustment device according to claim 1, characterized in that: The measuring block has four through holes and is fixed to the base plate by four bolts.

5. The fixture measurement system base plate flatness adjustment device according to claim 1, characterized in that: The number of measuring blocks is determined by the size of the fixture, ensuring that the measuring range of the fixture can cover the entire fixture body.

6. The fixture measurement system base plate flatness adjustment device according to claim 1, characterized in that: The measuring block has a size of 50mm × 50mm, which is the same as the size of the adjusting shim.

7. The fixture measurement system base plate flatness adjustment device according to claim 1, characterized in that: The thickness of the adjusting shim can be set to 0.1mm, 0.2mm, 0.5mm and 1.0mm.

8. The adjustment method of the fixture measurement system base plate flatness adjustment device as described in claim 1, characterized in that, Includes the following steps: A. Design and install multiple adjustable measuring blocks on the fixture to cover the measuring range of the fixture; B. When establishing a system for fixture accuracy measurement, use a measuring block instead of a base plate; C. Set adjustment shims between the measuring block and the base plate; D. Ensure the flatness is within tolerance, i.e. ±0.1mm, by adjusting the adjusting shims of the measuring block.

9. The adjustment method of the fixture measurement system base plate flatness adjustment device according to claim 8, characterized in that: Step C: Set 6 adjustment shims between each measuring block and the base plate. The thicknesses of the adjustment shims are 2 x 1mm, 1 x 0.5mm, 2 x 0.2mm, and 1 x 0.1mm.

10. The adjustment method of the fixture measurement system base plate flatness adjustment device according to claim 8, characterized in that: Step D: Use a portable coordinate measuring machine to adjust the height of all measuring blocks. By adding or subtracting shims, ensure that the flatness is within ±0.1mm. Use the 3-2-1 coordinate system establishment method, that is, use point-line-plane coordinate system establishment, and then measure the fixture.

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