A universal fixture for outboard arm machining

Abstract

The utility model relates to the field of fixture, disclose a general type clamp for outer steering arm processing, including clamp base plate and multiple groups are connected through bolt on the bottom plate upper end surface clamp body, the clamp body includes positioning assembly, lateral clamping assembly and top surface clamping mechanism, positioning assembly and lateral clamping assembly are separately arranged on both sides of outer steering arm, the locating pin of positioning assembly matches workpiece connecting hole, and lateral clamping assembly is through clamping spare and is pressed tightly workpiece, makes locating pin and workpiece clamping tightly, top surface clamping mechanism is located between the two, containing support base plate, at least three drive oil cylinders and corresponding replaceable pressing plate, and support base plate supports workpiece bottom surface, and oil cylinder drive pressing plate clamping workpiece top surface, the utility model can be through adjusting assembly and adapt to different model workpiece, and the point surface clamping of '' one side one pin '' positioning cooperation, ensure that workpiece is stable when processing, and boring position precision is high.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, specifically to a general-purpose fixture for machining external steering arms. Background Technology

[0002] Tooling comes in various types, with current fixture types including turning, drilling, broaching, boring, grinding, milling, and compound fixtures. The steering arm is a transmission linkage component in an automotive steering system, transmitting the movement of the steering wheel to the tie rod or drag link. During production, the steering arm needs to be positioned, its top surface machined, and the mounting holes bored.

[0003] In the existing technology, the tooling fixtures for boring external steering arms generally use a single fixed workpiece fixture. Therefore, the three series of external steering arm fixtures require three sets of fixtures to be processed individually. Using multiple boring fixtures or multiple machine tools increases the number of machine tools used, increases the time for loading and unloading fixtures, increases the repeated positioning error of fixtures, and reduces the processing efficiency of products. Summary of the Invention

[0004] This utility model addresses the problems of low equipment utilization, large repeatability errors, and low processing efficiency caused by dedicated tooling in the prior art. It provides a universal fixture for machining external steering arms. By adjusting the positions of the positioning component, the side clamping component, and the top clamping mechanism, it can be adapted to different models of external steering arms. At the same time, the workpiece is positioned in a "one face, one pin" manner, and the hydraulic cylinder drives the pressure plate to achieve point and surface clamping, ensuring workpiece stability and high boring position accuracy during the machining process.

[0005] This utility model is achieved through the following technical solution: A general-purpose fixture for machining outer steering arms, comprising: Fixture base plate; The clamp body is provided in multiple sets and is bolted to the upper end face of the clamp base plate; The clamp body includes a positioning component, a lateral clamping component, and a top surface clamping mechanism; The positioning component and the lateral clamping component are respectively located on both sides of the outer steering arm. The positioning component is provided with a positioning pin that matches the connecting hole on the outer steering arm. The lateral clamping component clamps the outer steering arm with a clamping member, so that the positioning pin is locked to the outer steering arm. The top clamping mechanism is located between the positioning component and the lateral clamping component, and includes a support base plate, at least three drive cylinders and replaceable pressure plates corresponding to each drive cylinder. The support base plate supports the bottom surface of the outer steering arm, the drive cylinders are distributed on the outside of the support base plate, and the drive cylinders drive the pressure plates to clamp the top surface of the outer steering arm.

[0006] In this solution, by setting multiple sets of bolt-connected fixture bodies on the fixture base plate, multiple outer steering arms can be clamped and processed simultaneously, significantly improving the batch size and overall production efficiency of a single processing operation. Within the fixture body, the positioning pins of the positioning components match the connecting holes of the outer steering arms, and together with the support base plate of the top clamping mechanism, support the bottom surface of the outer steering arms, forming a reliable "one face, one pin" positioning method. This effectively avoids errors caused by repeated tooling positioning, ensuring stable positional accuracy during boring and milling of the outer steering arms. Simultaneously, at least three drive cylinders of the top clamping mechanism drive corresponding replaceable pressure plates to clamp the top surface of the workpiece. This multi-point clamping structure prevents workpiece loosening or displacement during processing and allows for adaptation to the top surface structure features of different series of outer steering arms by changing the pressure plates, eliminating the need to replace the entire fixture set and significantly reducing tooling change costs and time. Therefore, the overall structure of this solution enables a single fixture to be used for the compatible machining of multiple series of external steering arms, reducing the number of machine tools used and improving equipment utilization. At the same time, its modular and adaptable design can be better integrated into automated production lines to meet the needs of batch processing, thus possessing both high practical value and economic benefits.

[0007] As a further solution, in order to better adapt to the multi-scenario processing needs of general-purpose fixtures and make up for the limitations of the traditional single arrangement method in batch processing or pair processing of parts, the fixture bodies are arranged in a series on the upper surface of the fixture base plate, or arranged in pairs opposite each other.

[0008] As a further embodiment, the clamping component includes a side-push cylinder, the output end of which is connected to a clamping block by bolts. The side-push cylinder drives the clamping block to press against the side end face of the outer steering arm. The clamping block acts directly on the side end face of the outer steering arm, forming a lateral bidirectional limit with the positioning pin, further enhancing the workpiece positioning stability and preventing lateral displacement of the workpiece during processing.

[0009] As a further solution, four lifting rings are fixed on the upper surface of the clamp base plate. The lifting rings are respectively located at the four corners of the clamp base plate. With the help of lifting equipment, the clamp can be transported and installed as a whole without the need for manual handling of the heavy clamp body.

[0010] As a further solution, a positioning block is fixed on the lower end face of the fixture base plate. The positioning block is used to cooperate with the machining center worktable. The positioning block can quickly lock the installation position of the fixture base plate on the worktable, eliminating the need to repeatedly adjust the overall coordinates of the fixture, greatly shortening the fixture clamping and debugging time, and helping to improve the efficiency of mass production.

[0011] As a further solution, to further enhance the stability of workpiece processing and reduce the scrap rate caused by fixture misalignment, positioning posts for positioning with the machining center worktable are also provided on both sides of the fixture base plate.

[0012] As a further solution, the support base plate is provided with a support seat. Multiple sets of support seats are provided and correspond to the pressure plate respectively. The support seat and the pressure plate correspond one-to-one, so that each clamping point on the top surface of the outer steering arm can be stably supported directly below, forming a force balance structure of "upper clamping and lower support". This avoids the workpiece from sinking or warping due to lack of local support when the drive cylinder drives the pressure plate to clamp.

[0013] As a further embodiment, the top surface clamping mechanism includes three drive cylinders and a replaceable pressure plate corresponding to each drive cylinder. The three drive cylinders are evenly distributed around the support base plate. The three evenly distributed drive cylinders can form a balanced three-point clamping force on the top surface of the workpiece from around the support base plate, avoiding warping or deformation of the top surface of the outer steering arm due to concentrated or uneven clamping force.

[0014] As a further embodiment, the top clamping mechanism frame also includes a connecting plate and a lever cylinder; The lever cylinder is connected to the upper end face of the clamp base plate and distributed around the outer steering arm. The output end of the lever cylinder is connected to the pressure plate through a pin. One end of the connecting plate is hinged to the lever cylinder, and the other end of the connecting plate is hinged to the pressure plate. When the lever cylinder drives the pressure plate, the pressure plate rotates around the connecting plate and clamps the top of the outer steering arm. When clamping, it can adapt to the contour shape of the top surface of the outer steering arm to ensure that the pressure plate is in close contact with the top surface of the workpiece and avoid local force concentration that causes deformation of the top surface of the workpiece.

[0015] As a further embodiment, a fixing block is also connected to the pressure plate. The free end of the fixing block is an arc surface and presses against the top of the outer steering arm. The arc surface structure can avoid stress concentration caused by local sharp corners when the fixing block contacts the top of the outer steering arm.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1. This utility model allows the positioning pins of the positioning component to match the connecting holes of different outer steering arms, and the clamping blocks of the side clamping component to be easily replaced by bolts to adapt to different side end face contours. The replaceable pressure plate of the top clamping mechanism can correspond to different top surface structures, and the support seat on the support base plate can be adjusted to adapt to different bottom surface support requirements. It eliminates the need to design multiple sets of special tooling for each series of outer steering arms, which reduces tooling procurement and storage costs and avoids the time consumption of frequent tooling changes, realizing the compatibility of one fixture with the processing of multiple series of outer steering arms. 2. In this utility model, the positioning component matches the connecting hole of the outer steering arm with the positioning pin, and with the controllable clamping force of the side-push cylinder of the side clamping component, a reliable "one-face-one-pin" positioning is formed, avoiding positioning deviation caused by uneven manual clamping force; and the top clamping mechanism adopts at least three evenly distributed drive cylinders, which, together with the connecting plate, realize the adaptive rotation of the pressure plate, and with the fixing block at the free end of the arc surface, can form a balanced three-point clamping force to prevent the workpiece from shaking, and can also avoid workpiece deformation caused by local stress concentration. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 These are schematic diagrams of the structure of this utility model in both its use and non-use states. Figure 2 This is a first three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the second three-dimensional structure of the present invention; Figure 4 for Figure 2 A schematic diagram of the structure marked A in the middle.

[0018] The attached diagram shows the markings and corresponding component names: 1-Clamp base plate; 2-Side push cylinder; 3-Cylinder seat; 4-Clamping block; 5-Lifting ring; 6-First lever cylinder; 7-First pressure plate; 8-Positioning base; 9-Positioning pin; 10-Second lever cylinder; 11-Third lever cylinder; 12-Second pressure plate; 13-Third pressure plate; 14-Support base plate; 15-Support seat; 16-Outer steering arm; 17-Positioning block; 18-First fixing block; 19-Second fixing block; 20-Third fixing block; 21-Positioning column; 22-Connecting plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only for explaining the present utility model and are not intended to limit the present utility model. It should be noted that... Figures 1-4 In the diagram, the pressure plate has two working states: one is the state of pressing the workpiece, and the other is the state of releasing it. For ease of understanding, they are shown in the same attached diagram.

[0020] Example 1 This embodiment 1 provides a general-purpose fixture for machining external steering arms, such as... Figures 1-4As shown, the fixture includes a base plate 1 and a fixture body. The fixture bodies are arranged in a series on the upper surface of the base plate 1, or in pairs facing each other, as shown. Figure 1 As shown, in order to make the structure more compact, the fixture bodies in this embodiment are arranged in pairs and relative to each other.

[0021] like Figure 1 As shown, the fixture body includes a positioning component, a side clamping component, and a top clamping mechanism. The positioning component and the side clamping component are located on both sides of the outer steering arm 16. The positioning component includes a positioning base 8 and a positioning pin 9. The positioning base 8 is bolted to the upper end face of the fixture base plate 1. In this embodiment, the height of the positioning base 8 can be adjusted according to the series of outer steering arms 16 (e.g., 80mm when adapting to the 80ASW series and 90mm when adapting to the 80AST series). Cross-series adaptation can be achieved by replacing the positioning base 8 with different heights. The positioning pin 9 is bolted to both ends of the positioning base 8. The axis of the positioning pin 9 coincides with the axis of the connecting hole of the outer steering arm 16. Its outer contour can be adapted according to the connecting hole of the outer steering arm. After being inserted into the connecting hole of the outer steering arm 16, it restricts the horizontal rotation and lateral displacement of the workpiece. It forms a "one-face-one-pin" positioning with the bottom support of the support base plate 14 of the top clamping mechanism.

[0022] like Figures 1-3 As shown, the aforementioned lateral clamping assembly is used to clamp the side of the outer steering arm, ensuring that the positioning pin 9 is reliably clamped to the workpiece. Each set of clamping body's lateral clamping assembly includes a side push cylinder 2, a cylinder seat 3, and a clamping block 4. The cylinder seat 3 is symmetrically fixed to the outer side of the upper end face of the clamping base plate 1 by bolts, and its surface is perpendicular to the clamping base plate 1. The side push cylinder 2 is fixed to the cylinder seat 3 by flange bolts, with its output end facing the positioning assembly. The hydraulic circuit of the side push cylinder 2 is connected in series with an MBRV-02P-1 type pressure regulating valve (not marked in the attached figure, integrated into the valve block on the side of the cylinder seat) to stabilize the lateral clamping force and avoid excessive pressure that could damage the workpiece or insufficient pressure that could cause the clamping to loosen. The clamping block 4 is detachably connected to the output end of the side push cylinder 2 by bolts. The inner contour of the clamping block 4 is adapted to the side end face of the outer steering arm (e.g., the side end face of the 80ASW series is arc-shaped, and the clamping block 4 is provided with an arc-shaped groove accordingly) to ensure a tight fit with the side of the workpiece and uniform transmission of clamping force.

[0023] like Figures 1-4 As shown, the top clamping mechanism is located between the positioning assembly and the side clamping assembly, and includes a support base plate 14, three drive cylinders and a replaceable pressure plate corresponding to each drive cylinder; Specifically, the support base plate 14 is fixed to the upper end face of the clamp base plate 1 by bolts to support the bottom surface of the outer steering arm 16. The support seat 15 is connected to the upper surface of the support base plate 14 by bolts. The height of the support seat 15 can be finely adjusted by the bottom adjusting bolts to adapt to the bottom support requirements of different series of outer steering arms. The three support seats 15 are distributed in a triangle to form a stable bottom support. The three drive cylinders are distributed on the outside of the support base plate 14, namely the first lever cylinder 6, the second lever cylinder 10, and the third lever cylinder 11. They are all fixed to the upper end face of the fixture base plate 1 by bolts. At the same time, the output end of the first lever cylinder 6 is rotatably connected to the first pressure plate 7 through a pin, the output end of the second lever cylinder 10 is rotatably connected to the second pressure plate 12 through a pin, and the output end of the third lever cylinder 11 is rotatably connected to the third pressure plate 13 through a pin. The free ends of the first pressure plate 7, the second pressure plate 12, and the third pressure plate 13 extend to the top surface of the outer steering arm 16. In this embodiment, all pressure plates can be replaced according to the outer steering arm series, and the clamping point on the top surface of the workpiece can be adapted by replacing the pressure plates of different lengths and angles.

[0024] like Figure 4 As shown, the free ends of the first pressure plate 7, the second pressure plate 12, and the third pressure plate 13 are respectively connected to the first fixing block 18, the second fixing block 19, and the third fixing block 20. The first fixing block 18, the second fixing block 19, and the third fixing block 20 are respectively fixed to the free ends of the corresponding pressure plates by bolts and correspond to the support seat 15. The support seat 15 corresponds to the pressure plate one by one, so that each clamping point on the top surface of the outer steering arm 16 can be stably supported directly below, forming a force balance structure of "upper clamping and lower support". At the same time, the first pressure plate 7, the second pressure plate 12, and the third pressure plate 13 are respectively provided with connecting plates 22 between them and the corresponding lever cylinders. One end of the connecting plate 22 is hinged to the cylinder body of the lever cylinder by a pin, and the other end is hinged to the pressure plate by a pin of the same specification, forming a rotatable connection structure to ensure that there is a clamping support point when the pressure plate is clamped.

[0025] Example 2 This embodiment 2 provides a general-purpose fixture for machining external steering arms based on the technical solution of embodiment 1, such as... Figures 1-4 As shown, a positioning block 17 is fixed to the lower end face of the fixture base plate 1 by welding. The positioning block 17 has a rectangular cross section and is fitted with the positioning groove of the machining center worktable with clearance, which is used to quickly position the fixture base plate on the worktable. At the same time, two positioning posts 21 are symmetrically welded on the left and right sides of the fixture base plate 1 to further assist in positioning and avoid lateral displacement during fixture processing.

[0026] In this embodiment, four lifting rings 5 ​​are also fixed on the upper surface of the fixture base plate 1. The four lifting rings 5 ​​are respectively fixed to the four corners of the fixture base plate 1 by bolts, and are used for hoisting the fixture as a whole (such as installing it to the machining center workbench, maintenance and handling), to ensure that the fixture is subjected to uniform force during hoisting and to avoid deformation.

[0027] Working principle: When clamping the outer steering arm 16, first replace the positioning base 8, positioning pin 9 and replaceable pressure plate according to the series to be processed, and adjust the height and position of the support base 15; place the outer steering arm 16 on the support base 15, so that the positioning pin 9 is inserted into the workpiece connection hole; start the side push cylinder 2, drive the clamping block 4 to press against the side of the workpiece, and ensure that the positioning pin 9 is clamped to the workpiece; then start the three lever cylinders, whose output ends push the pressure plate to rotate around the connecting plate 22, so that the arc surface of the fixing block presses against the top surface of the workpiece, forming an all-round fixation of "bottom surface support - side clamping - top surface three-point clamping", and boring and milling can be performed.

[0028] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A general-purpose jig for outer knuckle arm machining, characterized by, include: Fixture base plate (1); The clamp body is provided in multiple sets and is bolted to the upper end face of the clamp base plate (1); The clamp body includes a positioning component, a lateral clamping component, and a top surface clamping mechanism; The positioning component and the lateral clamping component are located on both sides of the outer steering arm (16). The positioning component is provided with a positioning pin (9) that matches the connecting hole on the outer steering arm (16). The lateral clamping component clamps the outer steering arm (16) with a clamping member, so that the positioning pin (9) is clamped to the outer steering arm (16). The top clamping mechanism is located between the positioning component and the side clamping component, and includes a support base plate (14), at least three drive cylinders and a replaceable pressure plate corresponding to each drive cylinder. The support base plate (14) supports the bottom surface of the outer steering arm (16). The drive cylinders are distributed on the outside of the support base plate (14), and the drive cylinders drive the pressure plate to clamp the top surface of the outer steering arm (16).

2. A general-purpose fixture for machining an outer steering arm according to claim 1, characterized in that, The fixture bodies are arranged in a series on the upper surface of the fixture base plate (1), or arranged in pairs opposite each other.

3. A general-purpose fixture for machining an outer steering arm according to claim 1, characterized in that, The clamping component includes a side-push cylinder (2), and the output end of the side-push cylinder (2) is connected to a clamping block (4) by bolts. The side-push cylinder (2) drives the clamping block (4) to press against the side end face of the outer steering arm (16).

4. A general-purpose fixture for machining an outer steering arm according to claim 1, characterized in that, Four lifting rings (5) are fixed on the upper end face of the fixture base plate (1), and the lifting rings (5) are respectively located at the four corners of the fixture base plate (1).

5. A general-purpose fixture for machining an outer steering arm according to claim 1, characterized in that, The lower end face of the fixture base plate (1) is fixed with a positioning block (17), which is used to cooperate with the machining center worktable.

6. A general-purpose fixture for machining an outer steering arm according to claim 5, characterized in that, The fixture base plate (1) is also provided with positioning posts (21) on both sides for positioning with the machining center worktable.

7. A general-purpose fixture for machining an outer steering arm according to claim 1, characterized in that, The support base plate (14) is provided with a support seat (15), and multiple sets of the support seats (15) are provided and correspond to the pressure plate respectively.

8. A general-purpose fixture for machining an outer steering arm according to claim 1, characterized in that, The top clamping mechanism includes three driving cylinders and a replaceable pressure plate corresponding to each driving cylinder. The three driving cylinders are evenly distributed around the support base plate (14).

9. A general-purpose fixture for machining an outer steering arm according to claim 8, characterized in that, The top clamping mechanism frame also includes a connecting plate (22) and a lever cylinder; The lever cylinder is connected to the upper end face of the clamp base plate (1) and distributed around the outer steering arm (16). The output end of the lever cylinder is connected to the pressure plate through a pin. One end of the connecting plate (22) is hinged to the lever cylinder, and the other end of the connecting plate (22) is hinged to the pressure plate. When the lever cylinder drives the pressure plate, the pressure plate rotates around the connecting plate (22) and clamps the top of the outer steering arm (16).

10. A general-purpose fixture for machining an outer steering arm according to claim 8, characterized in that, A fixing block is also connected to the pressure plate. The free end of the fixing block is an arc surface and presses against the top of the outer steering arm (16).

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