Fixing device for machining of multiple connecting rods

Abstract

The utility model provides a fixing device for processing a plurality of connecting rods, the fixing device comprises a positioning device, a clamping device and a pressing device, the positioning device comprises a positioning body and a positioning screw, the clamping device comprises a tool body, a V-shaped pressing plate and a jackscrew, and the pressing device comprises a pressing bolt, a gasket, a three-legged pressing plate, a pressure spring and a pressing foot. When the device is used for machining a plurality of connecting rods, a plurality of connecting rod workpieces can be accurately positioned and machined, and the problems that clamping errors and rotation errors are caused due to the fact that a dividing head is used for fixing in the connecting rod workpiece machining process, efficiency is low, the yield is insufficient, and the requirement for the skill level of an operator is high are solved. The device is simple in structure and low in manufacturing cost, and the batch machining convenience and efficiency of the connecting rod workpieces can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical manufacturing technology, specifically relating to a fixing device for processing multiple connecting rods. Background Technology

[0002] The machining of the connecting rod workpiece's lifting lug part typically employs a four-axis machining center, using an indexing head for clamping and fixing. After completing the cutting of the top, inner hole, and side, the indexing head needs to be rotated 180 degrees before machining the remaining parts. This method introduces certain clamping and indexing errors, leading to unstable control of the connecting rod workpiece's form and position tolerances, thus affecting product quality. Furthermore, when using an indexing head to clamp and fix the connecting rod workpiece, only one workpiece can be clamped at a time. For batch production of connecting rod workpieces, this operation is not only complex and inefficient, but also results in poor consistency in the quality of the machined products. The investment in four-axis equipment is too high, and it also requires a high level of operator skill, which is detrimental to the company's overall cost control and development. Therefore, while ensuring machining quality, designing a cost-effective and easy-to-operate fixing device for machining multiple connecting rods is of great significance for the company's development. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] This utility model proposes a fixing device for machining multiple connecting rods, in order to solve the technical problems of large positioning errors, low machining efficiency, high labor intensity of operators, and high machining costs when using the indexing head of a four-axis machining center to clamp and fix the machining of connecting rod workpieces.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, this utility model proposes a fixing device for processing multiple connecting rods. The fixing device includes a positioning device, a clamping device, and a pressing device; wherein,

[0007] The positioning device includes a positioning body and positioning screws. The positioning body includes a base and an L-shaped baffle fixed to the upper part of the base. Multiple stepped grooves are machined on the left and right sides of the base for fixing the fixing device to the worktable with bolts. An L-shaped clamping device mounting groove is machined on the top of the L-shaped baffle. A clamping device mounting threaded hole is machined on the long side end face of the L-shaped clamping device mounting groove. A pressure plate limiting groove is machined on the top of the long side of the L-shaped baffle. Multiple positioning screws are installed on the two inner end faces of the L-shaped baffle through the threaded holes. The clamping device is placed flat on the upper working surface of the positioning device, and the two positioning surfaces are respectively rested against the multiple positioning screws to achieve multi-point precise positioning.

[0008] The clamping device includes a fixture body, a V-shaped pressure plate, and set screws. The fixture body has a cuboid structure, with multiple positioning holes corresponding to the positions of multiple positioning screws on its rear and side faces. The fixture body is fixed to the base of the positioning body after being positioned by the positioning screws. The front face of the fixture body has multiple clamping positioning holes for simultaneously clamping and positioning multiple connecting rod workpieces. The V-shaped pressure plate has a cuboid structure with a V-groove on its bottom. Multiple V-shaped pressure plates are inserted into the corresponding clamping positioning holes and mate with the upper part of the cylinder of the connecting rod workpiece through the V-groove, forming line contact with the cylinder of the connecting rod workpiece. The top of the fixture body has multiple through holes, and the top of each V-shaped pressure plate has multiple threaded holes. Multiple set screws are inserted into the through holes on the fixture body and then screwed into the threaded holes on the corresponding V-shaped pressure plates to press down on the V-shaped pressure plates. The set screws and V-shaped pressure plates fasten multiple connecting rod workpieces in the corresponding clamping positioning holes of the fixture body, making multiple connecting rod workpieces and the clamping device an integral unit.

[0009] The clamping device includes a clamping bolt, a washer, a tripod plate, a compression spring, and pressure feet. The front end of the clamping bolt passes through the washer, the center hole of the tripod plate, and the compression spring in sequence before being screwed into the clamping device mounting thread hole on the positioning device. The tripod plate uses a three-point pressing method. Two front clamping plates are used to clamp the tooling in the clamping device, and one rear clamping plate acts as a support point, pressing against the top of the L-shaped baffle of the positioning device. The clamping plate is restricted from rotating with the clamping bolt by the clamping plate limiting groove on the L-shaped baffle. Each clamping plate has a pressure foot installed at its bottom by threads. When the clamping bolt is loosened, the compression spring can provide an upward thrust to the tripod plate, separating the tripod plate from the clamping device for easy removal of the clamping device.

[0010] Furthermore, three positioning screws are installed on the two inner end faces of the L-shaped baffle through threaded holes, with two installed on the long side and one on the short side, to achieve three-point positioning of the clamping device.

[0011] Furthermore, the positioning surface of the positioning screw adopts a round head structure.

[0012] Furthermore, the parallelism and perpendicularity of the six sides of the tooling body must be controlled within 0.015mm.

[0013] Furthermore, each clamping and positioning hole includes a square positioning hole at the top and a semi-circular positioning hole communicating with the lower part of the square positioning hole. The semi-circular positioning hole is used to place the connecting rod workpiece and mates with the lower cylindrical part of the connecting rod workpiece.

[0014] Furthermore, the square positioning hole is used to ensure that the positional accuracy and parallelism relative to the upper and lower reference surfaces of the tooling body are controlled within 0.015mm, and the clearance between the hole and the cylindrical part of the connecting rod workpiece is controlled within 0.005 to 0.015mm.

[0015] Furthermore, the V-shaped pressure plate is inserted into the corresponding square positioning hole.

[0016] Furthermore, the V-groove is designed to be 90 degrees.

[0017] Furthermore, the presser foot is made of aluminum.

[0018] (III) Beneficial Effects

[0019] This invention proposes a fixing device for machining multiple connecting rods. The fixing device includes a positioning device, a clamping device, and a clamping device. The positioning device includes a positioning body and positioning screws; the clamping device includes a tooling body, a V-shaped pressure plate, and a set screw; and the clamping device includes a clamping bolt, a washer, a tripod pressure plate, a compression spring, and a pressure foot. When machining multiple connecting rods using this device, precise positioning and machining of multiple connecting rod workpieces can be achieved, solving problems such as clamping and rotation errors caused by using an indexing head for fixing during connecting rod workpiece machining, as well as low efficiency, insufficient production volume, and high operator skill requirements. This device has a simple structure, low cost, and can improve the convenience and efficiency of batch machining of connecting rod workpieces. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the fixing device for processing multiple connecting rods according to this utility model;

[0021] Figure 2 This is an exploded view of the fixing device structure for processing multiple connecting rods according to this utility model.

[0022] In the diagram: 0-Connecting rod workpiece; 1-Positioning device; 2-Clamping device; 3-Pressure device; 4-Positioning body; 5-Positioning screw; 6-Tooling body; 7-V-type pressure plate; 8-Setting screw; 9-Locking bolt; 10-Washer; 11-Tripod pressure plate; 12-Compression spring; 13-Aluminum pressure foot. Detailed Implementation

[0023] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0024] This embodiment proposes a fixing device for machining multiple connecting rods, the overall structure of which is as follows: Figure 1 As shown, it mainly includes a positioning device 1, a clamping device 2, and a pressing device 3.

[0025] like Figure 2As shown, the positioning device 1 includes a positioning body 4 and positioning screws 5. The positioning body 4 includes a base and an L-shaped baffle fixed to the upper part of the base. Multiple stepped grooves are machined on the left and right sides of the base for fixing the entire device to the worktable with bolts. An L-shaped clamping device mounting groove is machined on the top of the L-shaped baffle, and a clamping device mounting threaded hole is machined on the long side end face of the L-shaped clamping device mounting groove. A pressure plate limiting groove is machined on the top of the long side of the L-shaped baffle. Three positioning screws 5 are installed on the two inner end faces of the L-shaped baffle through the threaded holes, two on the long side and one on the short side. The positioning surfaces of the positioning screws 5 have a round head structure. The clamping device 2 is placed flat on the upper working surface of the positioning device 1, and the two positioning surfaces are respectively placed against the three positioning screws 5, ensuring a tight fit without gaps, achieving precise three-point positioning.

[0026] The clamping device 2 includes a fixture body 6, a V-shaped pressure plate 7, and set screws 8. The fixture body 6 has a rectangular parallelepiped structure, and the parallelism and perpendicularity of its six sides are controlled within 0.015mm. The rear and side faces of the fixture body 6 are machined with three positioning holes corresponding to the positions of the three positioning screws 5. After being positioned by the positioning screws 5, the fixture body 6 is fixed to the base of the positioning body 4.

[0027] The front end face of the fixture 6 is machined with multiple clamping and positioning holes for simultaneously clamping and positioning multiple connecting rod workpieces 0. Each clamping and positioning hole includes a square positioning hole at the top and a semi-circular positioning hole communicating with the lower part of the square positioning hole. The semi-circular positioning hole is used to place the connecting rod workpiece 0 and mate with the lower half of the cylinder of the connecting rod workpiece 0. The square positioning hole is used to ensure that the positional accuracy and parallelism relative to the upper and lower reference surfaces of the fixture 6 are controlled within 0.015mm, and the clearance between the fixture and the cylinder of the connecting rod workpiece 0 is controlled within 0.005 to 0.015mm.

[0028] The V-shaped pressure plate 7 has a cuboid structure with a V-shaped groove machined on the bottom, designed at 90 degrees. Multiple V-shaped pressure plates 7 are inserted into corresponding square positioning holes and mate with the upper part of the cylinder of the connecting rod workpiece 0 through the V-shaped groove, forming line contact with the cylinder of the connecting rod workpiece 0. This helps to optimize the contact pressure distribution and avoid workpiece damage.

[0029] The top of the fixture body 6 is machined with multiple through holes, and the top of each V-shaped pressure plate 7 is machined with two threaded holes. After multiple set screws 8 are inserted into the through holes on the fixture body 6, they are screwed into the corresponding threaded holes on the V-shaped pressure plate 7 to press down on the V-shaped pressure plate 7. The set screws 8 and the V-shaped pressure plate 7 fasten multiple connecting rod workpieces 0 in the corresponding clamping and positioning holes of the fixture body 6, so that multiple connecting rod workpieces 0 and clamping device 2 form an integral unit.

[0030] The clamping device 3 includes a clamping bolt 9, a washer 10, a tripod plate 11, a compression spring 12, and an aluminum pressure foot 13. The front end of the clamping bolt 9 passes sequentially through the washer 10, the center hole of the tripod plate 11, and the compression spring 12 before being screwed into the clamping device mounting thread hole on the positioning device 1. The tripod plate 11 uses a three-point pressing method: two front pressure plates clamp the tooling body 6 in the clamping device 2, and a rear pressure plate acts as a support point, pressing against the top of the L-shaped baffle of the positioning device 1. The pressure plate limiting groove on the L-shaped baffle restricts the tripod plate 11 from rotating with the clamping bolt 9. Each pressure plate has an aluminum pressure foot 13 threadedly mounted at its bottom to prevent damage to the surface of the tooling body 6 in the clamping device 2, thus avoiding unnecessary positioning errors. When the clamping bolt 9 is loosened, the compression spring 12 provides an upward thrust to the tripod plate 11, separating it from the clamping device 2 for easy removal.

[0031] The method for machining multiple connecting rods using the above-mentioned fixing device includes the following steps:

[0032] The clamping device 2 uses set screws 8 and V-shaped pressure plates 7 to fix multiple connecting rod workpieces 0 and tooling body 6 into a whole. The clamping device 2 is placed against the side of the three positioning screws 5 of the positioning device 1, and the clamping device 2 is fixed and pressed to the positioning device 1 by the clamping device 3. Using the entire fixing device, the top, side, inner hole and chamfer of the connecting rod workpiece 0 are machined on the three-axis machining center. After the machining is completed, the clamping bolts 9 are loosened until the tripod pressure plate 11 is completely separated from the clamping device 2. The clamping device 2 is taken out and manually flipped. After flipping, the entire fixing device is fixed in the same way as above, and the machining of other surfaces and chamfers of the connecting rod workpiece 0 is continued.

[0033] By using this device, multiple connecting rod workpieces can be fixed and rotated for positioning and machining, reducing positioning errors caused by workpiece clamping and operation, and improving the efficiency of machining parts.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fixing device for machining multiple connecting rods, characterized in that, The fixing device includes a positioning device, a clamping device, and a pressing device; wherein... The positioning device includes a positioning body and positioning screws; wherein, the positioning body includes a base and an L-shaped baffle fixed to the upper part of the base; multiple stepped grooves are machined on the left and right sides of the base for fixing the fixing device to the worktable by bolts; an L-shaped clamping device mounting groove is machined on the top of the L-shaped baffle, a clamping device mounting threaded hole is machined on the long side end face of the L-shaped clamping device mounting groove, and a pressure plate limiting groove is machined on the top of the long side of the L-shaped baffle; multiple positioning screws are installed on the two inner end faces of the L-shaped baffle through the threaded holes, the clamping device is placed flat on the upper working surface of the positioning device, and the two positioning surfaces are respectively rested against the multiple positioning screws to achieve multi-point precise positioning; The clamping device includes a fixture body, a V-shaped pressure plate, and set screws. The fixture body has a cuboid structure, and its rear and side faces are machined with multiple positioning holes corresponding to the positions of multiple positioning screws. The fixture body is fixed to the base of the positioning body after being positioned by the positioning screws. The front face of the fixture body is machined with multiple clamping positioning holes for simultaneously clamping and positioning multiple connecting rod workpieces. The V-shaped pressure plate has a cuboid structure with a V-shaped groove machined at the bottom. Multiple V-shaped pressure plates are inserted into the corresponding clamping positioning holes and mate with the upper part of the cylinder of the connecting rod workpiece through the V-shaped groove, forming line contact with the cylinder of the connecting rod workpiece. The top of the fixture body is machined with multiple through holes, and the top of each V-shaped pressure plate is machined with multiple threaded holes. Multiple set screws are inserted into the through holes on the fixture body and then screwed into the threaded holes on the corresponding V-shaped pressure plates to press down on the V-shaped pressure plates. The set screws and V-shaped pressure plates fasten multiple connecting rod workpieces in the corresponding clamping positioning holes of the fixture body, making multiple connecting rod workpieces and the clamping device an integral unit. The clamping device includes a clamping bolt, a washer, a tripod plate, a compression spring, and a pressure foot. The front end of the clamping bolt passes sequentially through the washer, the center hole of the tripod plate, and the compression spring before being screwed into the clamping device mounting thread hole on the positioning device. The tripod plate uses a three-point pressing method. Two front clamping plates are used to clamp the tooling in the clamping device, and one rear clamping plate acts as a support point, pressing against the top of the L-shaped baffle of the positioning device. The clamping plate is restricted from rotating with the clamping bolt by the clamping plate limiting groove on the L-shaped baffle. Each clamping plate has a pressure foot threaded on its bottom. When the clamping bolt is loosened, the compression spring can provide an upward thrust to the tripod plate, separating the tripod plate from the clamping device for easy removal of the clamping device.

2. The fixing device for machining multiple connecting rods as described in claim 1, characterized in that, The two inner end faces of the L-shaped baffle are fitted with three positioning screws through threaded holes, with two screws installed on the long side and one screw installed on the short side, to achieve three-point positioning of the clamping device.

3. The fixing device for machining multiple connecting rods as described in claim 1, characterized in that, The positioning screw has a round head structure on its positioning surface.

4. The fixing device for machining multiple connecting rods as described in claim 1, characterized in that, The machining requirements for the six sides of the tooling body are that the parallelism and perpendicularity are both controlled within 0.015mm.

5. The fixing device for machining multiple connecting rods as described in claim 1, characterized in that, Each clamping and positioning hole includes a square positioning hole at the top and a semi-circular positioning hole communicating with the lower part of the square positioning hole. The semi-circular positioning hole is used to place the connecting rod workpiece and mates with the lower half of the cylindrical part of the connecting rod workpiece.

6. The fixing device for machining multiple connecting rods as described in claim 5, characterized in that, The square positioning hole is used to ensure that the positional accuracy and parallelism relative to the upper and lower reference surfaces of the tooling body are controlled within 0.015mm, and the clearance between the hole and the cylindrical part of the connecting rod workpiece is controlled within 0.005 to 0.015mm.

7. The fixing device for machining multiple connecting rods as described in claim 5, characterized in that, The V-shaped pressure plate is inserted into the corresponding square positioning hole.

8. The fixing device for machining multiple connecting rods as described in claim 1, characterized in that, The V-groove is designed to be 90 degrees.

9. The fixing device for machining multiple connecting rods as described in claim 1, characterized in that, The presser foot is made of aluminum.

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