A device for boring and grinding connecting rods of automobile engines

Abstract

This utility model relates to the field of automotive engine connecting rod processing technology, and in particular to an automotive engine connecting rod boring and grinding device. It includes a worktable, a lifting plate on the worktable, and a lifting mechanism for driving the lifting plate to move up and down. A first grinding motor and a second grinding motor are mounted on the lifting plate, and the first and second grinding motors respectively drive and connect to a first grinding head and a second grinding head. A first positioning groove and a second positioning groove are formed on the worktable. The first positioning groove is positioned directly opposite the first grinding head, and the second positioning groove is positioned directly opposite the second grinding head. Lateral limiting mechanisms are provided on both sides of the worktable near the first and second positioning grooves. A workpiece pressing and limiting mechanism is provided on the worktable, located between the first and second positioning grooves. This utility model enables simultaneous grinding of two bores, large and small, on the connecting rod, ensuring the relative positional accuracy between the bores and improving the assembly accuracy of the connecting rod.

Description

Technical Field

[0001] This utility model relates to the field of automotive engine connecting rod processing technology, and more specifically to an automotive engine connecting rod boring and grinding device. Background Technology

[0002] Among the core components of an automotive engine, the connecting rod is a crucial force-transmitting component connecting the piston and crankshaft. Its structural precision directly affects the engine's operational stability, power performance, and service life. Connecting rods typically have two bores, one large and one small, for mating with the crankshaft and piston pin, respectively. The dimensional accuracy, form and position tolerances (such as roundness, cylindricity, and coaxiality), and surface roughness requirements for these two bores are extremely high. Therefore, during the machining process of the connecting rod, the grinding process of the large and small bores is a critical step in ensuring its final precision.

[0003] Currently, the existing technology for grinding the large and small bores of connecting rods generally adopts a step-by-step grinding process. Specifically, the connecting rod is usually fixed by a positioning structure first, and a single grinding tool is used to grind one of the bores. After the bore is ground, the positioning position of the connecting rod needs to be adjusted manually or mechanically, or a grinding tool adapted to the other bore needs to be changed before grinding the other bore. This step-by-step grinding method has obvious limitations: on the one hand, the two grinding processes require multiple positioning adjustments or tool changes, which not only prolongs the processing cycle and reduces production efficiency, but also makes it difficult to meet the cycle time requirements of mass production; on the other hand, during the step-by-step grinding process, the two positioning operations are prone to cumulative errors, making it difficult to guarantee the relative positional accuracy (such as center distance, parallelism, etc.) between the large and small bores, which in turn affects the assembly accuracy of the connecting rod with the crankshaft and piston pin, increasing vibration and noise during engine operation. Utility Model Content

[0004] The purpose of this invention is to provide a connecting rod boring and grinding device for automobile engines, which can simultaneously grind the two bores of the connecting rod, ensuring the relative positional accuracy between the two bores and improving the assembly accuracy of the connecting rod.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A boring and grinding device for automotive engine connecting rods includes a worktable, a lifting plate and a lifting mechanism for driving the lifting plate to move up and down, a first grinding motor and a second grinding motor mounted on the lifting plate, the first grinding motor and the second grinding motor respectively driving and connecting a first grinding head and a second grinding head, the worktable having a first positioning groove and a second positioning groove, the first positioning groove being directly opposite the first grinding head and the second positioning groove being directly opposite the second grinding head, lateral limiting mechanisms being provided on both sides of the worktable near the first positioning groove and the second positioning groove, and a workpiece pressing limiting mechanism being provided on the worktable between the first positioning groove and the second positioning groove.

[0007] Furthermore, the lifting mechanism includes an L-shaped mounting bracket vertically fixedly installed on the workbench, a lead screw is vertically rotatably mounted on the L-shaped mounting bracket, a lead screw motor for driving the lead screw to rotate is mounted on the L-shaped mounting bracket, the lifting plate is threadedly connected to the lead screw, a guide rod is fixedly connected to the L-shaped mounting bracket, the guide rod is arranged parallel to the lead screw, and the lifting plate is slidably connected to the guide rod.

[0008] Furthermore, the lateral limiting mechanism includes a fixed limiting block fixedly connected to the worktable, the fixed limiting block being disposed near the first positioning groove, a limiting cylinder being installed on the worktable, the limiting cylinder being driven to connect a movable limiting block, the movable limiting block being disposed near the second positioning groove, and a V-shaped limiting clamping surface being provided on the opposite side of the fixed limiting block and the movable limiting block.

[0009] Furthermore, a mounting base is fixedly installed on the workbench, and a pressing cylinder is installed on the mounting base. The pressing cylinder is driven by a pressing plate, which is located between the first positioning groove and the second positioning groove (102).

[0010] Furthermore, both the first and second positioning circular grooves have a waste removal groove on their sidewalls, and the waste removal groove is connected to the outside of one sidewall of the worktable.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This application utilizes a lifting mechanism to drive a lifting plate, which in turn moves the first and second grinding motors synchronously downwards. This enables simultaneous grinding of the two bores on the connecting rod, eliminating the need for step-by-step operations or tool changes, significantly shortening the processing cycle, improving production efficiency, and meeting the cycle time requirements of mass production. Simultaneously, synchronous grinding avoids the accumulation of errors from multiple positioning steps, ensuring the relative positional accuracy (such as center distance and parallelism) between the large and small bores, and improving the assembly accuracy of the connecting rod. Furthermore, preliminary positioning is achieved through the first and second positioning grooves, which, in conjunction with the lateral limiting mechanisms on both sides and the workpiece pressing limiting mechanism in the middle, fix the connecting rod from multiple directions, effectively preventing lateral displacement and minor wobbling of the connecting rod during grinding, ensuring consistent grinding accuracy and surface finish. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0015] 1. Worktable; 101. First positioning groove; 102. Second positioning groove; 103. Impurity removal groove; 2. Lifting plate; 3. First grinding motor; 4. Second grinding motor; 5. First grinding head; 6. Second grinding head; 7. L-shaped mounting bracket; 8. Lead screw; 9. Lead screw motor; 10. Guide rod; 11. Fixed limit block; 12. Limit cylinder; 13. Moving limit block; 14. V-shaped limit clamping surface; 15. Mounting base; 16. Pressing cylinder; 17. Pressing plate. Detailed Implementation

[0016] like Figures 1 to 2 As shown, a boring and grinding device for automotive engine connecting rods includes a worktable 1. The worktable 1 has a lifting plate 2 and a lifting mechanism for driving the lifting plate 2 to move up and down. A first grinding motor 3 and a second grinding motor 4 are mounted on the lifting plate 2. The first grinding motor 3 and the second grinding motor 4 respectively drive and connect a first grinding head 5 and a second grinding head 6. The worktable 1 has a first positioning groove 101 and a second positioning groove 102. The first positioning groove 101 is positioned directly opposite the first grinding head 5, and the second positioning groove 102 is positioned directly opposite the second grinding head 6. Lateral limiting mechanisms are provided on both sides of the worktable 1 near the first positioning groove 101 and the second positioning groove 102. A workpiece pressing and limiting mechanism is provided on the worktable 1, located between the first positioning groove 101 and the second positioning groove 102.

[0017] The lifting mechanism includes an L-shaped mounting frame 7 vertically fixedly installed on the workbench 1. A lead screw 8 is vertically rotatably mounted on the L-shaped mounting frame 7. A lead screw motor 9 that drives the lead screw 8 to rotate is mounted on the L-shaped mounting frame 7. The lifting plate 2 is threadedly connected to the lead screw 8. A guide rod 10 is fixedly connected to the L-shaped mounting frame 7. The guide rod 10 is arranged parallel to the lead screw 8. The lifting plate 2 is slidably connected to the guide rod 10.

[0018] The lateral limiting mechanism includes a fixed limiting block 11 fixedly connected to the worktable 1. The fixed limiting block 11 is located near the first positioning groove 101. A limiting cylinder 12 is installed on the worktable 1. The limiting cylinder 12 drives a movable limiting block 13. The movable limiting block 13 is located near the second positioning groove 102. Both the fixed limiting block 11 and the movable limiting block 13 have V-shaped limiting clamping surfaces 14 on their opposite sides. The fixed limiting block 11 cooperates with the movable limiting block 13 driven by the limiting cylinder 12, and the V-shaped limiting clamping surfaces 14 on their opposite sides can adapt to the lateral contour of the connecting rod. At the same time, the bidirectional clamping can offset the radial force during grinding, prevent the connecting rod from moving laterally, and enhance positioning stability.

[0019] A mounting base 15 is fixedly installed on the workbench 1, and a pressing cylinder 16 is installed on the mounting base 15. The pressing cylinder 16 drives a pressing plate 17, which is located between the first positioning groove 101 and the second positioning groove 102. The pressing cylinder 16 drives the pressing plate 17, which applies downward pressure from the middle of the connecting rod. The pressing plate 17 forms a multi-directional fixation with the support of the positioning groove and the clamping of the lateral limiting mechanism, effectively suppressing the axial or radial shaking of the connecting rod during the grinding process and further ensuring the grinding accuracy.

[0020] The first positioning groove 101 and the second positioning groove 102 are both provided with a debris removal groove 103 on their side walls. The debris removal groove 103 is connected to the outer side of one side wall of the worktable 1. After grinding, the debris generated during grinding can be discharged through the debris removal groove 103, so as to avoid the debris from accumulating in the first positioning groove 101 or the second positioning groove 102 and affecting the matching accuracy of the grinding tool and the boring hole in the next grinding, thus ensuring the stability of the processing quality.

[0021] Working principle:

[0022] First, the connecting rod to be processed is placed in the first positioning groove 101 and the second positioning groove 102 of the worktable 1, and the connecting rod is initially positioned by the first positioning groove 101 and the second positioning groove 102; then, the limiting cylinder 12 drives the moving limiting block 13 to approach the fixed limiting block 11, clamping and limiting the connecting rod from both sides, while the pressing cylinder 16 drives the pressing plate to move down, applying pressure downward from the middle of the connecting rod to firmly fix the connecting rod on the worktable 1; then, the lead screw motor... 9 drives the lifting plate 2 to move downward, driving the first grinding motor 3 and the second grinding motor 4 to descend synchronously, so that the first grinding head 5 and the second grinding head 6 respectively extend into the large and small boring holes of the connecting rod, and perform grinding operations on the two boring holes simultaneously; after grinding is completed, the lead screw motor 9 drives the lifting plate 2 to move upward, the first grinding head 5 and the second grinding head 6 exit the boring holes, the lateral limiting mechanism and the pressing limiting mechanism are released, the processed connecting rod is removed, and the generated debris is discharged through the waste discharge groove 103, completing one grinding cycle.

[0023] This invention solves the problems of low efficiency and large cumulative error in traditional step-by-step grinding by simultaneously grinding the large and small bores of the connecting rod using two synchronously driven grinding motors, thus significantly improving production efficiency and the machining accuracy of the connecting rod. The multi-directional positioning and limiting structure (positioning groove, lateral limiting, and central pressing) works together to ensure the stability of the connecting rod during the grinding process and effectively avoids machining defects caused by offset or shaking.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for boring and grinding connecting rods of an automobile engine, characterized in that: The system includes a workbench (1), on which a lifting plate (2) and a lifting mechanism for driving the lifting plate (2) to rise and fall are provided. A first grinding motor (3) and a second grinding motor (4) are installed on the lifting plate (2). The first grinding motor (3) and the second grinding motor (4) drive and connect a first grinding head (5) and a second grinding head (6) respectively. A first positioning groove (101) and a second positioning groove (102) are provided on the workbench (1). The first positioning groove (101) is set directly opposite the first grinding head (5), and the second positioning groove (102) is set directly opposite the second grinding head (6). Lateral limiting mechanisms are provided on both sides of the workbench (1) near the first positioning groove (101) and the second positioning groove (102). A workpiece pressing limiting mechanism is provided on the workbench (1) and is located between the first positioning groove (101) and the second positioning groove (102).

2. The apparatus of claim 1 wherein: The lifting mechanism includes an L-shaped mounting bracket (7) that is vertically fixed on the workbench (1). A lead screw (8) is vertically rotatably mounted on the L-shaped mounting bracket (7). A lead screw motor (9) that drives the lead screw (8) to rotate is mounted on the L-shaped mounting bracket (7). The lifting plate (2) is threadedly connected to the lead screw (8). A guide rod (10) is fixedly connected to the L-shaped mounting bracket (7). The guide rod (10) is parallel to the lead screw (8). The lifting plate (2) is slidably connected to the guide rod (10).

3. The automotive engine connecting rod boring and grinding device as described in claim 1, characterized in that: The lateral limiting mechanism includes a fixed limiting block (11) fixedly connected to the workbench (1), the fixed limiting block (11) being disposed near the first positioning groove (101), a limiting cylinder (12) being installed on the workbench (1), the limiting cylinder (12) being driven to connect a movable limiting block (13), the movable limiting block (13) being disposed near the second positioning groove (102), and a V-shaped limiting clamping surface (14) being provided on the opposite side of the fixed limiting block (11) and the movable limiting block (13).

4. The automotive engine connecting rod boring and grinding device as described in claim 1, characterized in that: A mounting base (15) is fixedly installed on the workbench (1), and a pressing cylinder (16) is installed on the mounting base (15). The pressing cylinder (16) drives a pressing plate (17) which is located between the first positioning groove (101) and the second positioning groove (102).

5. The automotive engine connecting rod boring and grinding device as described in claim 1, characterized in that: The first positioning groove (101) and the second positioning groove (102) are both provided with a waste removal groove (103) on their side walls, and the waste removal groove (103) is connected to the outside of one side wall of the worktable (1).

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