Parts positioning method

Abstract

The present invention belongs to the field of measurement bracket technology. In order to realize the purpose of different parts sharing the same bracket system, reducing the number of brackets and shrinking storage space, the present invention discloses a universal bracket system and part positioning method, including a base plate and a plurality of positioning brackets; the base plate is provided with a porous array for installing the positioning brackets; the porous array is formed by continuously and repeatedly arranging basic units, and the basic units are composed of positioning holes surrounding a central symmetrical pattern; the positioning bracket includes a base and a column, the upper end of the column is provided with a top plate, and the top plate is provided with a positioning unit; the lower end of the column is connected to the base, and the base is provided with mounting holes surrounding the column, and the mounting holes form a central symmetrical pattern around the column that can overlap with the basic unit. The present invention is modularly designed by breaking the whole into parts, and each positioning reference on the part is respectively positioned and supported by a corresponding positioning bracket, and the support and positioning of various parts are achieved by arranging the bracket groups in different forms.

Description

Technical Field

[0001] The present invention belongs to the technical field of measuring brackets, and in particular relates to a universal bracket system and a part positioning method. Background Art

[0002] In manufacturing companies, most parts are positioned on a measuring stand to ensure the correct measurement posture. Dimensional information is then acquired through methods such as three-dimensional coordinate measurement and blue light scanning. This allows for the detection of various dimensional elements, including aperture size, position, clearance, flushness, and trimming.

[0003] The design and development, manufacturing, processing, and precision testing cycles of traditional measuring brackets are long. At the same time, the design of measuring brackets generally requires 3D digital models of parts and GDT drawings to determine the positioning reference and detection elements, which leads to late start-up time and cannot meet the early part detection needs of the project. In addition, development is usually based on the positioning reference system of the parts. Basically, one measuring bracket (integrated) is developed for each part, and different brackets are required for left and right parts. Especially in the field of automobile production and manufacturing, there are a large number of left and right parts, such as left and right door panels, left and right rearview mirrors, and other left and right parts with mirror-symmetrical relationships. The need to develop a large number of inspection tools leads to high development costs, manufacturing costs, space occupation costs, and maintenance costs. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and provide a universal bracket system so that different parts can share the same bracket system, thereby reducing the number of brackets and shrinking the storage space.

[0005] The present invention is achieved through the following technical solutions:

[0006] A universal bracket system includes a base plate and several positioning brackets; the base plate is provided with a porous array for mounting the positioning brackets; the porous array is formed by a continuous and repeated arrangement of basic units, and the basic units are composed of positioning holes that form a centrally symmetrical pattern; the positioning bracket includes a base and a column, the upper end of the column is provided with a top plate, and the top plate is provided with a positioning unit; the lower end of the column is connected to the base, and the base is provided with mounting holes surrounding the column, and the mounting holes form a centrally symmetrical pattern around the column that can coincide with the basic unit.

[0007] Furthermore, the positioning unit includes a center positioning unit; the vertical center line of the center positioning unit is located on the reference line of the base; the reference line refers to a vertical line passing through the center point of the central symmetrical figure surrounded by the mounting holes.

[0008] Furthermore, the positioning unit further includes an offset positioning unit; a vertical center line of the offset positioning unit deviates from the reference line.

[0009] Furthermore, the offset positioning unit is detachably connected to the top plate, and the top plate is provided with symmetrical offset positioning unit mounting positions with respect to the plane where the reference line is located.

[0010] Furthermore, the central positioning unit is a positioning pin or a positioning surface; and the offset positioning unit is a positioning pin or a positioning surface.

[0011] Furthermore, the basic unit is composed of positioning holes that form a square; and the mounting holes form a square around the column.

[0012] Furthermore, the hole spacing between adjacent positioning holes on the bottom plate is 50 to 100 mm.

[0013] The present invention also provides a parts positioning method, which is characterized by: using the universal bracket system provided by the present invention;

[0014] Optimizing the part positioning reference system according to the hole spacing of adjacent positioning holes on the base plate;

[0015] Select positioning brackets to build bracket groups:

[0016] For areas where the spacing between positioning references on parts can be adjusted to an integer multiple of the hole spacing between adjacent positioning holes on the mounting base plate, a positioning bracket with a central positioning unit is used for positioning support; for areas where the spacing between positioning references on parts cannot be adjusted to an integer multiple of the hole spacing between adjacent positioning holes on the base plate, a positioning bracket with an offset positioning unit is used for positioning support.

[0017] Furthermore, it is used to detect left and right parts with a mirror-symmetrical relationship; after measuring any one of the left and right parts, the bracket group composed of each positioning bracket is adjusted to a mirror-image bracket group to position and support the other one of the left and right parts.

[0018] Furthermore, adjusting the bracket group into a mirror bracket group includes the following steps: rotating the measuring bracket with the offset positioning unit 180°, removing the offset positioning unit from the original offset positioning unit installation position and installing it on another offset positioning unit installation position on the top plate that is symmetrical to the original offset positioning unit.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This invention abandons the prior art concept of requiring a single integral measuring bracket for each component. Instead, it employs a modular design, with each positioning datum on a component supported by a corresponding positioning bracket. By arranging brackets in different configurations, various components can be supported and positioned. Sharing of left and right components is achieved by varying the bracket arrangement.

[0021] 2. The central symmetrical figure formed by the mounting holes in the positioning bracket can coincide with the original figure after being rotated 180°. Therefore, after rotating 180°, the mounting holes on the base will not be misaligned with the positioning holes on the base plate, thereby improving the adaptability of the base and the base plate.

[0022] 3. In view of the mirror symmetry of the left and right parts, the present invention designs a center positioning unit and an offset positioning unit to meet different positioning requirements respectively. The center positioning unit only needs to be translated to meet the mirror symmetry requirement, and the offset positioning unit can meet the mirror symmetry requirement by rotating 180° and then installing it to a symmetrical position.

[0023] 4. The basic unit is composed of positioning holes arranged in a square, which makes it easier to adjust the spacing of the positioning brackets by moving them horizontally on the base plate to match the optimized positioning reference system of the parts.

[0024] 5. The present invention has strong versatility, greatly reducing the development and manufacturing costs of the bracket, shortening the project development cycle. The reduction in the number of developed measurement brackets reduces the storage space occupied by the brackets and the maintenance cost.

[0025] 6. It can also reduce the size of the base plate, reducing the manufacturing cost and space occupied by the base plate. By simply switching, the left and right parts of the bracket can be shared, eliminating the need to transport the bracket and improving measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a design flow chart for a universal bracket system;

[0027] Figure 2 Schematic diagram of the hole spacing on the base plate;

[0028] Figure 3 A schematic diagram of the part positioning reference system for adjustment;

[0029] Figure 4 Schematic diagram of the structure of the positioning bracket with an offset positioning unit set in the Y-axis direction;

[0030] Figure 5 A schematic diagram of the structure of a positioning bracket with an offset positioning unit provided in the X-axis direction;

[0031] Figure 6 This is a schematic diagram showing the effect of adjusting the bracket group to a mirror bracket group;

[0032] Figure 7 The diagram shows the adjustment principle of the positioning bracket with an offset positioning unit. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] A universal bracket system includes a base plate and several positioning brackets; the base plate is provided with a porous array for mounting the positioning brackets; the porous array is formed by continuously and repeatedly arranging basic units, and the basic units are composed of positioning holes that form a centrally symmetrical pattern; the positioning bracket includes a base and a column, the upper end of the column is provided with a top plate, and the top plate is provided with a positioning unit; the lower end of the column is connected to the base, and the base is provided with mounting holes surrounding the column, and the mounting holes form a centrally symmetrical pattern around the column that can overlap or partially overlap with the basic unit.

[0035] In this embodiment, the basic unit is composed of positioning holes arranged in a square shape; the mounting holes are arranged in a square shape around the pillars. Of course, the basic unit can also be composed of positioning holes arranged in a rhombus, rectangle or parallelogram shape.

[0036] refer to Figure 1 As shown, the design process of the universal bracket system of this specific embodiment includes the following steps:

[0037] 1) The distance between the parts positioning references is designed in combination with the integer multiples of the spacing between the positioning holes of the base plate.

[0038] Taking into account the base plate design and the parts positioning reference system strategy, based on the base plate design specifications, the relative distance of the positioning points in the same direction is designed to be an integer multiple of the base plate mounting hole spacing to meet the overall movement requirements.

[0039] refer to Figure 2 As shown, the base plate comprehensive bracket is easy to move and the cost of opening holes is taken into consideration, and the positioning holes and mounting holes are designed with a distance of 50 to 100 mm.

[0040] Define the design rules for the part positioning datum system. Optimize the datum position while meeting the 6-DOF positioning principle and part structural requirements. In the same direction, the relative distance between positioning points is designed to be an integer multiple of the base plate hole spacing to facilitate translation adjustment.

[0041] refer to Figure 3As shown in the figure, the development of a positioning datum system for the interior panel of a certain vehicle model is used as an example. The panel's main positioning surface utilizes four datums to position the part in the Y direction. Primary and secondary locating pins are used to position the part in the X and Z directions. For example, the Z coordinate of the A3 datum is 725, but to facilitate bracket movement, it is adjusted to 730, maintaining the same Z height as the A4. The X coordinate of the A2 datum is 1300, but to facilitate bracket movement, it is adjusted to 1320, maintaining the X-direction relative distance from the remaining datums at an integer multiple of 100 mm. The datums for other parts can be optimized based on this design rule.

[0042] 2) Based on the principle of symmetry, the design requirements for the positioning units on the measurement bracket are standardized. The positioning units include a central positioning unit and an offset positioning unit. The central positioning unit is a positioning pin or a positioning surface; the offset positioning unit is a positioning pin or a positioning surface.

[0043] The vertical centerline of the center positioning unit is located on the base's reference line; the reference line is a vertical line passing through the center point of the central symmetrical figure surrounded by the mounting holes. The center positioning unit only needs to be translated to meet the mirror symmetry requirement.

[0044] refer to Figure 4 As shown, the vertical center line of the offset positioning unit deviates from the reference line. The offset positioning unit is detachably connected to the top plate 2, and the top plate 2 is provided with symmetrical offset positioning unit mounting positions 201 about the plane where the reference line is located.

[0045] The offset positioning unit can be set in the Y-axis direction or the X-axis direction according to the positioning reference of the part. In addition, the offset unit can be switched from the Y-axis to the X-axis direction by rotating the positioning bracket 90°.

[0046] refer to Figure 4 As shown, an offset positioning unit is provided in the Y-axis direction. The positioning unit is the positioning surface 202. The design requirements for the positioning unit on the positioning bracket are standardized. The positioning unit is designed to be located as much as possible on the center line of the X-axis line connecting the mounting holes 101 of the base 1, so that the mounting holes are symmetrical with respect to the positioning unit. The distance between the positioning unit and the mounting holes 101 on both sides in the X-axis direction is equal, that is, the distance A = B. This ensures that the spacing between the positioning bracket and the other positioning bracket in the X-axis direction is an integer multiple of the base plate hole spacing. In this case, since there is no positioning requirement and positioning unit in the X-axis direction, mirroring can be achieved after translation without rotation.

[0047] refer to Figure 5 As shown, an offset positioning unit is set in the X-axis direction, specifically a designated position 202, and the positioning pin 203 is only offset in the Y-axis direction, not in the X-axis. The corresponding symmetrical structural unit is pre-designed to be symmetrical with the original unit relative to the bracket, ensuring that after translation, there is a positioning unit at the corresponding mirror position. Figure 5As shown, the positioning unit is symmetrical with respect to the plane where the reference line is located, and the distance C=D.

[0048] A parts positioning method uses the universal bracket system in this specific embodiment to support and position various parts by arranging bracket groups in different forms, as follows:

[0049] Optimizing the part positioning reference system according to the hole spacing of adjacent positioning holes on the base plate;

[0050] Select positioning brackets to build bracket groups:

[0051] For areas where the spacing between positioning references on parts can be adjusted to an integer multiple of the hole spacing between adjacent positioning holes on the mounting base plate, a positioning bracket with a central positioning unit is used for positioning support; for areas where the spacing between positioning references on parts cannot be adjusted to an integer multiple of the hole spacing between adjacent positioning holes on the base plate, a positioning bracket with an offset positioning unit is used for positioning support.

[0052] The universal bracket system of this specific embodiment can also be used to position left and right parts with a mirror-symmetrical relationship. Specifically, after measuring any one of the left and right parts, the bracket group composed of the various positioning brackets is adjusted to a mirror-image bracket group to position and support the other one of the left and right parts.

[0053] refer to Figure 6 As shown, the bracket group is adjusted to a mirror bracket group as follows: a symmetry axis is selected on the bracket mounting base plate, and each measuring bracket is translated to the other side of the symmetry axis at an equal distance from the symmetry axis; the measuring bracket with the offset positioning unit is rotated 180°, the offset positioning unit is removed and installed on the top plate at the offset positioning unit installation position symmetrical about the reference line.

[0054] For adjustment steps of the offset positioning unit, refer to Figure 7 As shown, Figure 7 The middle locating pin is offset in the negative direction of the X-axis. After translation, the positioning bracket is rotated 180°, and the locating pin rotates to the negative direction of the X-axis, forming mirror symmetry. However, the locating surface originally offset in the positive direction of the Y-axis reaches the negative direction of the Y-axis as the positioning bracket rotates. In order to meet the mirror symmetry, the locating surface is removed and installed on the offset unit installation position in the positive direction of the Y-axis.

[0055] When the base plate size is small, the bracket group can also be adjusted to a mirrored bracket group as follows: interchange the positions of the measuring brackets on the left and right sides of the bracket group, rotate the measuring bracket with the offset positioning unit 180°, remove the offset positioning unit and install it on the top plate at the offset positioning unit installation position symmetrical about the reference line.

[0056] This invention integrates component positioning datums and the modularity of the bracket structure. By optimizing the component positioning datum system and the positioning bracket structure, it enables the bracket to be adjusted on the base plate and flexibly adjusted, allowing both left and right parts to be measured using the same set of measurement brackets. This design management method addresses current production application issues such as the large number of measurement brackets required, high development and maintenance costs, significant storage space requirements, and low usability.

[0057] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0059] The above technical solution is only one embodiment of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A parts positioning method, characterized in that: A universal bracket system is used for part positioning, comprising a base plate and a plurality of positioning brackets; the base plate is provided with a porous array for mounting the positioning brackets; the porous array is formed by a continuous and repeated arrangement of basic units, each of which is composed of positioning holes arranged in a centrally symmetrical pattern; the positioning bracket comprises a base and a column, the upper end of the column being provided with a top plate, the top plate being provided with a positioning unit; the lower end of the column is connected to the base, the base being provided with mounting holes surrounding the column, the mounting holes forming a centrally symmetrical pattern around the column that can overlap with the basic unit; The positioning unit includes a center positioning unit; the vertical center line of the center positioning unit is located on the reference line of the base; the reference line refers to a vertical line passing through the center point of the central symmetrical figure surrounded by the mounting holes; The positioning unit further includes an offset positioning unit; the vertical center line of the offset positioning unit deviates from the reference line; Optimizing the part positioning reference system according to the hole spacing of adjacent positioning holes on the base plate; Select positioning brackets to build bracket groups: For areas where the spacing between positioning datums on parts can be adjusted to an integer multiple of the hole spacing between adjacent positioning holes on the mounting base, a positioning bracket with a central positioning unit is used for positioning support; for areas where the spacing between positioning datums on parts cannot be adjusted to an integer multiple of the hole spacing between adjacent positioning holes on the base, a positioning bracket with an offset positioning unit is used for positioning support; Used for left and right parts with a mirror-symmetrical relationship; after measuring any one of the left and right parts, the bracket group composed of each positioning bracket is adjusted to a mirror-image bracket group to position and support the other one of the left and right parts; Adjusting the bracket group to a mirror bracket group includes the following steps: rotating the measuring bracket with the offset positioning unit 180°, removing the offset positioning unit from the original offset positioning unit installation position and installing it on another offset positioning unit installation position on the top plate that is symmetrical to the original offset positioning unit.

2. The universal bracket system according to claim 1, characterized in that: The offset positioning unit is detachably connected to the top plate, and the top plate is provided with symmetrical offset positioning unit mounting positions with respect to the plane where the reference line is located.

3. The universal bracket system according to claim 2, characterized in that: The center positioning unit is a positioning pin or a positioning surface; the offset positioning unit is a positioning pin or a positioning surface.

4. The universal bracket system according to claim 3, characterized in that: The basic unit is composed of positioning holes that form a square; the mounting holes form a square around the columns.

5. The universal bracket system according to claim 4, characterized in that: The hole spacing between adjacent positioning holes on the base plate is 50 to 100 mm.

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