Quick positioning tool for auxiliary frame casting blank

Abstract

The utility model discloses an auxiliary frame casting blank rapid positioning tool which comprises a tool base plate, an inner supporting clamping sleeve and a base are arranged on the base plate, the inner supporting clamping sleeve and the base are arranged in a spaced mode in the circumferential direction, a positioning column and a first pressing assembly are arranged on the base, a blank lining hole is formed in the inner supporting clamping sleeve and the positioning column in a sleeved mode, and a second pressing assembly is arranged on the blank lining hole. The inner supporting clamping sleeve expands and abuts against the lining hole to complete radial positioning, and the first pressing assembly presses the blank to complete axial positioning. A second pressing assembly is further arranged on the tool base plate and located on the inner sides of the inner supporting clamping sleeve and the base in the circumferential direction. According to the tool, the problem that an existing tool is poor in adaptability to blanks with complex structures and large shape variation is solved, efficient and accurate positioning is achieved, the production efficiency is improved, and the large-scale production requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of machining tooling and fixtures, specifically to a quick positioning tooling for a subframe casting blank. Background Technology

[0002] In the production of automotive parts, the machining of subframe casting blanks is a crucial step. The precision and efficiency of machining have a significant impact on product quality and production efficiency. However, sand-cast subframe parts often face numerous problems before machining, affecting the smooth progress of subsequent processing.

[0003] In existing technologies, conventional clamping and positioning methods are typically used to machine subframe casting blanks. For example, simple fixtures are used to fix the blank directly on the machining center's worktable, and then it is roughly positioned based on some features on the blank. The operator then further adjusts the machining datum based on experience and measuring tools. During machining, to ensure the stability of the blank, basic clamping devices are used to press the blank firmly onto the worktable to prevent it from moving during machining.

[0004] Due to the inherent characteristics of sand casting, subframe casting blanks are prone to deformation, unstable dimensional tolerances, and inconsistent datum positions among parts of the same product before machining. In such cases, using conventional clamping and positioning methods requires operators to spend a significant amount of time directly measuring, calculating, and adjusting the machining datum using tools such as dial indicators for each product, resulting in low production efficiency. Furthermore, accuracy is highly dependent on the operator's skill level and the precision of the measuring tools, making it difficult to meet the processing requirements of large-volume production. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide a quick positioning tooling for subframe casting blanks, which aims to solve the problem that existing tooling has poor adaptability to blanks with complex structures and large shape variations, thus affecting processing accuracy and efficiency.

[0006] Technical Solution: This utility model provides a quick positioning fixture for a subframe casting blank, including a fixture base plate. The fixture base plate is provided with a set of inner support sleeves and a set of bases. The inner support sleeves and bases are spaced apart circumferentially along the fixture base plate. The base is provided with a positioning post and a first clamping assembly. The bushing hole on the blank is fitted onto the inner support sleeves and the positioning post. The inner support sleeves expand outwards to press against the bushing hole, completing radial positioning. Then, the first clamping assembly is activated to press the blank, completing axial positioning. Through the inner support sleeves provided on the fixture base plate, when the bushing hole of the blank is fitted onto the inner support sleeves, the inner support sleeves can expand outwards and tightly press against the inner wall of the bushing hole. This ingenious design precisely defines the position of the blank in the radial direction, effectively preventing radial offset and wobbling, ensuring the accuracy and stability of the blank's radial positioning, and laying a solid foundation for subsequent processing steps. The first clamping component equipped on the base plays a key role. After the blank is fitted into the positioning post through the bushing hole and the inner support sleeve completes the initial radial positioning, the first clamping component is activated immediately, firmly pressing the blank down. By restricting the blank's displacement in the axial dimension, and cooperating with the radial positioning, it achieves all-round positioning control of the blank, preventing the blank from moving axially during processing. Since the inner support sleeve can expand outward, as long as the bushing hole size is within the design adaptation range of the inner support sleeve, the tooling can be flexibly adjusted and fitted to bushing holes of different inner diameters, demonstrating a certain degree of versatility and adapting to various specifications of subframe casting blanks, reducing dependence on blanks of a specific single size.

[0007] Furthermore, in this application, a quick positioning fixture for a subframe casting blank includes a second clamping assembly on the fixture base plate. This second clamping assembly is located on the inner side of the inner support sleeve and base along the circumferential direction of the fixture base plate. Based on the axial positioning achieved by the original first clamping assembly, a second clamping assembly is added to the inner side of the fixture base plate, forming a multi-point clamping layout. Applying clamping force to the blank from different directions and angles, compared to single axial clamping, can more stably "lock" the blank, effectively eliminating minor displacements caused by potential factors such as irregular blank structure and uneven center of gravity distribution. This comprehensively enhances the fixing effect of the blank on the fixture base plate. While the inner support sleeve and base apply force around the blank bushing hole for positioning, the blank may have local thin walls, irregular structures, or stress concentration areas, and conventional clamping positions may not be able to provide adequate stability. The second clamping component is located on the inner side of the circumference, precisely targeting these particularly weak and critical parts for focused fixation, preventing deformation, cracking, and other adverse conditions in these parts during processing vibration and cutting force impact.

[0008] Furthermore, in this application, a quick positioning fixture for a subframe casting blank includes a first clamping assembly comprising a first rotary pressing cylinder, the output end of which is provided with a first pressing block. The first rotary pressing cylinder, as a power drive unit, gives the first pressing block flexible and versatile movement characteristics. After the blank is processed, the first pressing block rotates upward and releases, facilitating the removal of the blank.

[0009] Furthermore, in this application, a quick positioning fixture for a subframe casting blank includes a second clamping assembly comprising a second rotary pressing cylinder. The output end of the second rotary pressing cylinder is provided with a second pressing block, and the end of the second pressing block is provided with an adjusting screw perpendicular to the base plate. The adjusting screw plays a crucial role in pressure regulation. By rotating the adjusting screw, the contact distance between the second pressing block and the blank can be precisely changed, thereby adjusting the clamping force. This design allows operators to flexibly and accurately set appropriate clamping forces based on factors such as the material properties, structural strength, and processing requirements of different parts of the blank, meeting diverse positioning and processing needs.

[0010] Furthermore, in this application, a quick positioning tooling for a subframe casting blank is provided, wherein the positioning post includes a cylinder, the cylinder has a first end face, and a cylindrical pin protrudes from the middle of the first end face, the diameter of the cylindrical pin being smaller than the diameter of the cylinder.

[0011] Furthermore, this application discloses a rapid positioning fixture for subframe casting blanks. The inner support sleeve comprises a sleeve body and an expansion sleeve. The expansion sleeve is mounted on the sleeve body and consists of at least three support petals with gaps between them. Both the upper and lower parts of the expansion sleeve are cylindrical, with the upper diameter smaller than the lower diameter, and a second end face is provided between the upper and lower parts. The inner support sleeve, composed of a sleeve body and an expansion sleeve, with at least three support petals and gaps between them, provides the expansion sleeve with adaptive radial expansion capabilities. When the blank's bushing hole is fitted onto the expansion sleeve, applying a certain external force (such as hydraulic or pneumatic driving methods to force the sleeve body onto the expansion sleeve) causes the support petals to expand outward along the gaps, thus tightly pressing against the inner wall of the bushing hole. This achieves adaptive fitting for bushing holes of different inner diameters, effectively positioning the blank in the radial direction and adapting to variations in hole diameter within a certain range, enhancing the fixture's adaptability to blanks of various specifications.

[0012] Furthermore, this application provides a quick positioning fixture for a subframe casting blank, wherein the bushing hole on the blank is fitted into a cylindrical pin and an expansion sleeve, and positioned on a first end face and a second end face, the first end face and the second end face being at the same horizontal plane. This design, where the first end face and the second end face are at the same horizontal plane, provides a precise positioning reference for the blank in the height direction, ensuring that the mounting height of the blank on the fixture base plate is fixed and uniform.

[0013] Furthermore, this application discloses a quick positioning fixture for a subframe casting blank. The fixture base plate is rectangular, with inner support sleeves located at two right angles on one side of the rectangle, and the base located at the other two right angles. By placing the inner support sleeves at two right angles on one side of the rectangular fixture base plate and the base at the other two right angles, stable support and positioning points are formed at the four corners of the fixture base plate. This arrangement allows the positioning force on the blank to be distributed relatively evenly across the four corners of the fixture base plate, avoiding stress concentration in one location or on one side.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0015] 1. The subframe casting blank rapid positioning fixture of this utility model achieves efficient and precise positioning through reasonable structural design, significantly improving production efficiency. The fixture base plate is equipped with components such as an inner support sleeve and a base that work together. The inner support sleeve can adaptively expand outward to press against the blank bushing hole to complete radial positioning. The positioning pin on the base assists in radial positioning, while its equipped first clamping component can quickly activate and press the blank to achieve axial positioning. Furthermore, some structures are further optimized. For example, the first clamping component uses a first rotary pressing cylinder combined with a first pressure block, which can quickly respond and flexibly adjust the force angle; the second clamping component's second rotary pressing cylinder combined with a second pressure block with an adjusting screw can precisely adjust the clamping force. These designs make the blank positioning process rapid and accurate. Compared with traditional positioning methods, it greatly shortens the positioning time of a single blank. When mass-producing subframe casting blanks, the number of blanks that can be processed per unit time increases significantly, effectively improving the production efficiency of the entire production line and meeting the needs of large-scale production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a quick positioning tooling structure for a subframe casting blank according to the present invention;

[0017] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0018] Figure 3 for Figure 1 Enlarged view of region B in the middle;

[0019] Figure 4 This is a schematic diagram of the structure of a quick positioning tool for a subframe casting blank according to the present invention.

[0020] Figure 5 A schematic diagram of the subframe casting blank structure.

[0021] Explanation of reference numerals in the accompanying drawings: 1-Tooling base plate, 11-Inner support sleeve, 111-Sleeve body, 112-Expansion sleeve, 1121-Support petal, 1122-Gap, 1123-Second end face, 12-Base, 13-Positioning post, 131-Cylinder, 132-First end face, 133-Cylindrical pin, 14-First clamping assembly, 141-First rotary pressing cylinder, 142-First pressing block, 15-Second clamping assembly, 151-Second rotary pressing cylinder, 152-Second pressing block, 153-Adjusting screw. Detailed Implementation

[0022] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 , 4 A quick positioning fixture for a subframe casting blank, as shown in Figure 5, includes a fixture base plate 1. The fixture base plate 1 has two inner support sleeves 11 and two bases 12. The fixture base plate 1 is rectangular. The bases 12 have positioning posts 13 and a first clamping assembly 14. The bushing holes on the blank are fitted onto the inner support sleeves 11 and the positioning posts 13. The inner support sleeves 11 are located at two right angles on one side of the rectangle, and the bases 12 are located at the other two right angles. The inner support sleeves 11 expand outwards to press against the bushing holes, completing radial positioning. Then, the first clamping assembly 14 is activated to press the blank, completing axial positioning. Through the inner support sleeves 11 provided on the fixture base plate 1, when the bushing holes of the blank are fitted onto the inner support sleeves 11, the inner support sleeves 11 can expand outwards and tightly press against the inner wall of the bushing holes. This ingenious design precisely defines the position of the blank in the radial direction, effectively preventing radial offset and wobbling, ensuring the accuracy and stability of the blank's radial positioning, and laying a solid foundation for subsequent processing steps. The first clamping component 14 equipped on the base 12 plays a key role. After the blank is initially positioned radially by fitting the positioning post 13 through the bushing hole and the inner support sleeve 11, the first clamping component 14 immediately activates, firmly pressing the blank down. By restricting the displacement of the blank in the axial dimension, and cooperating with the radial positioning, it achieves all-round positioning control of the blank, preventing the blank from moving axially during processing. Since the inner support sleeve 11 can expand outward, as long as the bushing hole size is within the design adaptation range of the inner support sleeve 11, the tooling can be flexibly adjusted and fitted to bushing holes with different inner diameters, demonstrating a certain degree of versatility and adapting to various specifications of subframe casting blanks, reducing dependence on blanks of a specific single size.

[0024] In this embodiment, as Figure 1As shown, the tooling base plate 1 is also provided with two second clamping components 15, which are located on the inner side of the inner support sleeve 11 and the base 12 along the circumferential inner side of the tooling base plate 1. Based on the axial positioning achieved by the original first clamping component 14, the second clamping component 15 is added on the circumferential inner side of the tooling base plate 1 to form a multi-point clamping layout. Applying clamping force to the blank from different directions and angles can more stably "lock" the blank compared to only single axial clamping, effectively eliminating the slight displacement caused by potential factors such as irregular structure of the blank itself and uneven distribution of center of gravity, and comprehensively strengthening the fixing effect of the blank on the tooling base plate 1. The inner support sleeve 11 and the base 12 apply force to position the blank around the bushing hole, but the blank may have local thin walls, irregular structures or stress concentration areas, and conventional clamping positions may not be able to properly stabilize it. The second clamping component 15 is located on the inner side of the circumference, precisely targeting these particularly weak and critical parts for focused fixation, preventing deformation, cracking and other adverse conditions in these parts during processing vibration and cutting force impact.

[0025] In this embodiment, as Figure 3 The first pressing assembly 14 shown includes a first rotary pressing cylinder 141, and a first pressing block 142 is provided at the output end of the first rotary pressing cylinder 141. The first pressing block 142 is elongated. The first rotary pressing cylinder 141 serves as a power drive unit, giving the first pressing block 142 flexible and versatile movement characteristics. After the blank is processed, the first pressing block 142 rotates, rises, and releases, making it convenient to remove the blank.

[0026] In this embodiment, as Figure 2 The second clamping assembly 15 shown includes a second rotary pressing cylinder 151. A second pressing block 152 is provided at the output end of the second rotary pressing cylinder 151. The second pressing block 152 is elongated, and an adjusting screw 153 is provided at its end. The screw is threaded through a threaded hole at the end of the second pressing block 152 to adjust its length. The adjusting screw 153 is perpendicular to the base plate 1. The adjusting screw 153 plays a crucial role in pressure regulation. By rotating the adjusting screw 153, the contact distance between the second pressing block 152 and the blank can be precisely changed, thereby adjusting the clamping force. This design allows operators to flexibly and accurately set appropriate clamping forces based on factors such as the material properties, structural strength, and processing requirements of different parts of the blank, meeting diverse positioning and processing needs.

[0027] In this embodiment, as Figure 3As shown, the positioning post 13 includes a cylinder 131 with a first end face 132. A cylindrical pin 133 protrudes from the middle of the first end face 132, and the diameter of the cylindrical pin 133 is smaller than the diameter of the cylinder 131. The inner support sleeve 11 includes a sleeve body 111 and an expansion sleeve 112. The expansion sleeve 112 is disposed on the sleeve body 111 and consists of three support petals 1121 with gaps 1122 between them. The upper and lower parts of the expansion sleeve 112 are cylindrical, with the upper diameter smaller than the lower diameter. A second end face 1123 is provided between the upper and lower parts. The inner support sleeve 11 is composed of the sleeve body 111 and the expansion sleeve 112. The expansion sleeve 112 consists of three support petals 1121 with gaps between them. This structure enables the expansion sleeve 112 to have the ability to adaptively expand radially. After the bushing hole of the blank is fitted onto the expansion sleeve 112, the clamp body 111 is forced to apply force to the expansion sleeve 112 by means of air pressure. The support flap 1121 can be pushed outward along the gap 1122, thereby tightly pressing against the inner wall of the bushing hole, realizing adaptive fitting of bushing holes with different inner diameters, effectively completing the positioning of the blank in the radial direction, and adapting to the hole diameter changes within a certain range, thus enhancing the adaptability of the tooling to blanks of various specifications.

[0028] In this embodiment, as Figure 2 , 3 As shown, the bushing hole on the blank is fitted into the cylindrical pin 133 and the expansion sleeve 112, and is positioned on the first end face 132 and the second end face 1123, which are on the same horizontal plane. This design, where the first end face 132 and the second end face 1123 are on the same horizontal plane, provides a precise positioning reference for the blank in the height direction. This ensures that the mounting height of the blank on the tooling base plate 1 is fixed and uniform.

[0029] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A quick positioning tooling for a subframe casting blank, characterized in that: The tooling base plate (1) is provided with a set of inner support sleeves (11) and a set of bases (12). The inner support sleeves (11) and bases (12) are spaced apart along the circumference of the tooling base plate (1). The bases (12) are provided with positioning posts (13) and a first pressing assembly (14). The bushing hole on the blank is fitted onto the inner support sleeves (11) and the positioning posts (13). The inner support sleeves (11) expand outward to press against the bushing hole to complete radial positioning. Then the first pressing assembly (14) is activated to press the blank to complete axial positioning.

2. The quick positioning fixture for a subframe casting blank according to claim 1, characterized in that: The tooling base plate (1) is also provided with a set of second pressing components (15), which are located on the inner support sleeve (11) and the base (12) along the circumferential inner side of the tooling base plate (1).

3. The quick positioning fixture for a subframe casting blank according to claim 2, characterized in that: The first pressing assembly (14) includes a first rotary pressing cylinder (141), and the output end of the first rotary pressing cylinder (141) is provided with a first pressing block (142).

4. The quick positioning fixture for a subframe casting blank according to claim 3, characterized in that: The second pressing assembly (15) includes a second rotary pressing cylinder (151), the output end of the second rotary pressing cylinder (151) is provided with a second pressing block (152), the end of the second pressing block (152) is provided with an adjusting screw (153), and the adjusting screw (153) is perpendicular to the substrate (1).

5. The quick positioning fixture for a subframe casting blank according to claim 1, characterized in that: The positioning post (13) includes a cylinder (131), on which a first end face (132) is provided, and a cylindrical pin (133) protrudes in the middle of the first end face (132), the diameter of the cylindrical pin (133) being smaller than the diameter of the cylinder (131).

6. The quick positioning fixture for a subframe casting blank according to claim 5, characterized in that: The inner support sleeve (11) includes a sleeve body (111) and an expansion sleeve (112). The expansion sleeve (112) is disposed on the sleeve body (111). The expansion sleeve (112) is composed of at least three support petals (1121). There is a gap (1122) between the support petals (1121). The upper and lower parts of the expansion sleeve (112) are cylindrical, with the upper diameter being smaller than the lower diameter. A second end face (1123) is provided between the upper and lower parts.

7. A quick positioning fixture for a subframe casting blank according to claim 6, characterized in that: The bushing hole on the blank is fitted into the cylindrical pin (133) and the expansion sleeve (112), and is placed on the first end face (132) and the second end face (1123), with the first end face (132) and the second end face (1123) on the same horizontal plane.

8. The quick positioning fixture for a subframe casting blank according to claim 1, characterized in that: The tooling base plate (1) is rectangular, the inner support sleeve (11) is located at two right angles on one side of the rectangle, and the base (12) is located at the other two right angles.

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