A straightening fixture for castings

Abstract

The application discloses a shape correcting clamp for a casting, which comprises a base, the upper end surface of the base is provided with a plurality of supporting columns for supporting a workpiece, at least two of the supporting columns are oppositely arranged in an oblique direction, the supporting columns arranged in the oblique direction are provided with L-shaped limiting protrusions, and the other supporting column is provided with a positioning groove; a pressing plate is arranged above the base, the lower end surface of the pressing plate is provided with a plurality of pressing rods corresponding to the supporting columns of the base, and the pressing rods and the supporting columns are matched to correct the shape of the workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal casting, in particular to a shape correcting clamp for castings. BACKGROUND

[0002] Heat treatment refers to a processing technology that controls heating and cooling of materials to make them change phase or structure in solid state, so as to improve the performance of the materials. Generally, heat treatment will change the hardness, toughness, ductility, strength and other properties of the materials. At present, the main body of the subframe of a vehicle is usually made of aluminum alloy structure to ensure that the subframe improves the stiffness of the vehicle body, and the front subframe of the vehicle also supports the engine and the transmission. Therefore, in the production process, the cast subframe is subjected to heat treatment to ensure the hardness, toughness, ductility, strength, corrosion resistance, wear resistance and heat resistance of the subframe. However, in the actual production process, the castings of low-pressure casting have a certain amount of deformation, and the deformation amount of the castings is increased after heat treatment, especially the deformation amount of the welding gap of the front cast aluminum bracket for welding the extruded part is huge, which leads to poor connection accuracy, assembly difficulty, fracture of the welding connection, even scrap, material waste and increased production cost. SUMMARY

[0003] The present application aims at solving the problems of the prior art, and provides a shape correcting clamp for castings, which solves the problems of huge deformation of castings after heat treatment, poor connection accuracy, assembly difficulty, fracture of the welding connection, even scrap, material waste and increased production cost.

[0004] The present application is achieved in the following manner:

[0005] A shape correcting clamp for castings, comprising a base, the upper end face of the base is provided with a plurality of support columns for providing support for the workpiece, at least two of the support columns are arranged obliquely opposite to each other, the obliquely opposite support columns are provided with L-shaped limiting protrusions, another support column is provided with a positioning groove, the upper side of the base is provided with a pressing plate, the lower end face of the pressing plate is provided with a plurality of pressing rods corresponding to the plurality of support columns of the base, and the pressing rods and the support columns cooperate to correct the shape of the workpiece.

[0006] The support columns of the base include a first support column, a second support column, a third support column, a fourth support column and a fifth support column, the first support column and the second support column are used to provide support for the two sides of the front end of the workpiece, the third support column, the fourth support column and the fifth support column are used to provide support for the two sides of the rear end and the middle part of the workpiece, the first support column and the third support column are arranged obliquely opposite to each other, the first support column and the third support column are provided with obliquely opposite L-shaped limiting protrusions, the second support column is provided with a limiting protruding edge, and the fifth support column is provided with a positioning groove.

[0007] The height of the first support column and the second support column is less than the height of the third support column, the fourth support column and the fifth support column.

[0008] The pressing plate is provided with a first pressing rod opposite to the first support column, a second pressing rod opposite to the second support column, a third pressing rod opposite to the third support column, a fourth pressing rod opposite to the fourth support column and a fifth pressing rod opposite to the fifth support column, and the fifth pressing rod is provided with a groove matched with the positioning groove of the fifth support column for correcting the welding gap of the workpiece.

[0009] The fourth support column is located between the third support column and the fifth support column to provide support for the middle part of the workpiece.

[0010] The base is fixedly connected with the support column through bolts, and the pressing plate is fixedly connected with the pressing rod through bolts.

[0011] The shape correcting clamp for the castings comprises a base, the upper end surface of the base is provided with a plurality of support columns for providing support for the workpiece, at least two of the support columns are oppositely arranged in an inclined manner, the oppositely arranged support columns in the inclined manner are provided with L-shaped limiting protrusions, so that the L-shaped limiting protrusions oppositely arranged in the inclined manner provide support for the workpiece and limit the front, back, left and right ends of the workpiece at the same time. The other support column is provided with a positioning groove, the positioning groove and the L-shaped limiting protrusion can be used as a positioning reference for the workpiece for positioning the workpiece. The upper portion of the base is provided with a pressing plate, the lower end surface of the pressing plate is provided with a plurality of pressing rods opposite to the plurality of support columns of the base respectively, and the pressing rods are matched with the support columns to correct the shape of the workpiece. Therefore, the assembly precision of the castings is improved, the product size is ensured, the effective assembly of the product is ensured, the firmness between the assembly parts is improved, the scrap rate is reduced, the material cost is reduced, the assembly efficiency is improved and the production cost is reduced.

[0012] The shape correcting clamp for the castings is ingenious in design, easy to implement, improves the assembly precision of the aluminum alloy castings, ensures the product size, ensures the effective assembly of the product, improves the firmness between the assembly parts, reduces the scrap rate, reduces the material cost, improves the assembly efficiency and reduces the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is a structural schematic view of the shape correcting clamp for the castings;

[0014] Fig. 2 It is an axial side view of the shape correcting clamp for the castings;

[0015] Figs. 3-4 It is a cooperation view of the shape correcting clamp for the castings and the front cast aluminum support. DETAILED DESCRIPTION

[0016] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described below in more details in conjunction with the accompanying drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be simply understood as a limitation on the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. The embodiments of the present application will be described in details below in conjunction with the accompanying drawings:

[0017] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0018] Reference Figs. 1-4A kind of shape correcting fixture of casting, including base 1, the upper end surface of the base 1 is equipped with multiple support columns for providing support for workpiece, at least two described support columns are arranged oppositely, the support column of the oppositely arranged is equipped with L-shaped limit protrusion, another described support column is equipped with positioning groove, so as to provide positioning reference for workpiece by two limit protrusions and one positioning groove.The support column of the base 1 includes first support column 11, second support column 12, third support column 13, fourth support column 14, fifth support column 15, the first support column 11, second support column 12 is used to provide support for the both sides of the front end of workpiece, the third support column 13, fourth support column 14, fifth support column 15 is used to provide support for the both sides of the rear end and middle part of workpiece, the first support column 11 and third support column 13 are oppositely arranged, the first support column 11, third support column 13 are equipped with oppositely arranged L-shaped limit protrusion, so as to provide support for workpiece by oppositely arranged L-shaped limit protrusion while limiting the front and rear ends of workpiece.The second support column 12 is equipped with limit protruding edge, the limit protruding edge limits the front end of workpiece, the fifth support column 15 is equipped with positioning groove, and the positioning groove is positioned for the welding gap of workpiece.The height of the first support column 11 and second support column 12 is less than the height of third support column 13, fourth support column 14 and fifth support column 15, that is, the height of the support column for providing support for the front end of workpiece is less than the height of the support column for providing support for the rear end of workpiece.The fourth support column 14 is located between third support column 13 and fifth support column 15, and provides support for the middle part of workpiece, so that the support column provides effective support and positioning for workpiece.The size of the support column can be selected according to the structure of the workpiece to be shaped.The upper side of the base 1 is provided with a pressing plate 2, and the lower end surface of the pressing plate 2 is provided with a plurality of pressing rods corresponding to the plurality of support columns of the base 1, and the pressing rods are matched with the support columns to shape the workpiece.The pressing plate 2 is provided with a first pressing rod 21 opposite to the first support column 11, a second pressing rod 22 opposite to the second support column 12, a third pressing rod 23 opposite to the third support column 13, a fourth pressing rod 24 opposite to the fourth support column 14, and a fifth pressing rod 25 opposite to the fifth support column 15.The fifth pressing rod 25 is provided with a groove, and the groove is matched with the positioning groove of the fifth support column 15, so that the positioning groove of the fifth support column 15 and the groove of the fifth pressing rod 25 can better fit the workpiece, ensuring the shaping accuracy of the workpiece.The base 1 is fixedly connected with the support column by bolts, and the pressing plate 2 is fixedly connected with the pressing rod by bolts.

[0019] The shape correcting clamp of the castings of the present application works as follows (taking the cast aluminum bracket as an example, a groove is arranged between the welding joint of the cast aluminum bracket and the body of the cast aluminum bracket, so the deformation of the welding joint is huge): according to the deformation characteristics of the workpiece to be corrected, i.e. the cast aluminum bracket 3, the corresponding support column and pressure rod are selected and installed on the base 1 and the pressure plate 2 respectively, the base 1 is fixed on the operation table, the pressure plate 2 is fixedly connected with the oil press, the cast aluminum bracket before heat treatment is placed on the support column, the first support column 11, the second support column 12, the third support column 13, the fourth support column 14 and the fifth support column 15 provide support for the cast aluminum bracket and limit the front and back and left and right ends of the cast aluminum bracket, wherein the welding joint of the cast aluminum bracket is opposite to the positioning groove of the fifth support column 15, the fourth support column 14 provides support for the groove of the body of the cast aluminum bracket, the pressure plate moves downward under the action of the oil press, each pressure rod is pressed downward to cooperate with the corresponding support column to correct the cast aluminum bracket, at this time, the groove of the fifth pressure rod cooperates with the positioning groove of the fifth support column to correct the welding joint. The deformation of the cast aluminum bracket is controlled within 1mm from 3-4mm, thereby improving the precision of the castings, ensuring the product size, ensuring the effective assembly of the product, ensuring the welding of the welding joint to be more firm, and effectively reducing the cost.

Claims

1. A straightening fixture for a casting, characterized by: The base (1) is provided with a plurality of support columns for supporting the workpiece, the support columns of the base (1) include first support columns (11), second support columns (12), third support columns (13), fourth support columns (14) and fifth support columns (15), the first support columns (11) and the second support columns (12) are used for supporting the front end of the workpiece, the third support columns (13), the fourth support columns (14) and the fifth support columns (15) are used for supporting the rear end of the workpiece, the first support columns (11) and the third support columns (13) are arranged in an opposite and inclined manner, the first support columns (11) and the third support columns (13) are provided with L-shaped limiting protrusions in an opposite and inclined manner, the second support columns (12) are provided with limiting protrusions, the fifth support columns (15) are provided with positioning grooves, the heights of the first support columns (11) and the second support columns (12) are less than the heights of the third support columns (13), the fourth support columns (14) and the fifth support columns (15), the base (1) is provided with a pressing plate (2), the lower end surface of the pressing plate (2) is provided with a plurality of pressing rods corresponding to the plurality of support columns of the base (1), the pressing plate (2) is provided with a first pressing rod (21) corresponding to the first support columns (11), a second pressing rod (22) corresponding to the second support columns (12), a third pressing rod (23) corresponding to the third support columns (13), a fourth pressing rod (24) corresponding to the fourth support columns (14) and a fifth pressing rod (25) corresponding to the fifth support columns (15), the fifth pressing rod (25) is provided with a groove, the groove is matched with the positioning groove of the fifth support columns (15), and the pressing rods and the support columns are matched to correct the workpiece.

2. The straightening fixture for castings according to claim 1, characterized in that: The fourth support columns (14) are located between the third support columns (13) and the fifth support columns (15) and are used for supporting the middle part of the workpiece.

3. The straightening fixture for castings of claim 1 wherein: The base (1) is fixedly connected with the support columns through bolts, and the pressing plate (2) is fixedly connected with the pressing rods through bolts.

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