Connecting rod cover tile pin hole machining, positioning and clamping device and method

Abstract

The invention discloses a connecting rod cover tile pin hole machining, positioning and clamping device and method, and belongs to the technical field of machining. The device comprises a clamp body, and the clamp body comprises an inclined vertical plate fixedly connected to a bottom plate; one side of the vertical plate is fixedly connected with a positioning nail and a rhombic pin which are vertically arranged at an interval; one end of a connecting plate is fixedly connected to the side face of the vertical plate, the outer end of the connecting plate is fixedly connected with a first stud, and a first handle is screwed on the first stud. The first pressing plate is arranged on the first stud in a sleeving manner; the middle of the positioning surface is fixedly connected with a second stud; the second handle is screwed on the second stud; the second stud is sleeved with the second pressing plate. The side face of the lower portion of the vertical plate is fixedly connected with a drill plate, and the drill plate is fixedly connected with a drill bushing. Connecting rod cover tile pin hole machining can be achieved on common equipment, the production cost is reduced, meanwhile, the rigidity of a machining tool is improved, and the machining precision and the size stability can be further improved.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically a device and method for machining, positioning and clamping pin holes of connecting rod cover tiles. Background Technology

[0002] Connecting rods are crucial components of internal combustion engines. The bearing pin holes on the connecting rod cap are used for bearing positioning, and their machining quality directly affects the engine's performance and reliability. Located on the inner side of the connecting rod cap's arc, these pin holes are blind holes with a small angle to the mating surface. The machined area is an arc surface, and these structural limitations result in a long tool overhang and reduced tool rigidity, leading to significant machining difficulties. Existing technology involves machining on a CNC machining center equipped with a rotary table or angle head, which is costly and makes it difficult to guarantee product quality. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention provides a clamping and positioning device and method for machining connecting rod cap crown pin holes. The aim is to achieve connecting rod crown pin hole machining using ordinary equipment such as radial drilling machines, thereby improving machining accuracy while reducing production costs. Typically, the two sides, mating surfaces, and threaded connection holes of the connecting rod cap are already machined before the crown pin holes are machined, and positioning is achieved using the machined surfaces and threaded connection holes.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a clamping device for machining and positioning pin holes of a connecting rod cap, comprising a clamping body, the clamping body including a base plate for mounting to a drilling equipment; an inclined vertical plate fixedly connected to the base plate; positioning pins and diamond-shaped pins arranged vertically and horizontally fixedly connected to one side of the vertical plate, respectively for insertion into two threaded connection holes of the connecting rod cap; a connecting plate having one end fixedly connected to the side of the vertical plate, the side facing the positioning pin being a positioning surface for fitting against the side of the connecting rod cap; a first stud fixedly connected to its outer end, a first handle screwed onto the first stud; and a first pressure plate fitted through a pre-set sleeve hole in its middle. On the first stud, when the first handle is tightened, the first pressure plate presses against the apex of the outer arc surface of the connecting rod cover; the second stud is fixedly connected in the middle of the positioning surface; the second handle is screwed onto the second stud; the second pressure plate is fitted onto the second stud through a pre-set notch in the middle, so that when the second handle is tightened, the connecting plate and the second pressure plate respectively press against the left and right sides of the connecting rod cover; a drill template is fixedly connected to the lower side of the upright plate, and a drill sleeve is fixedly connected to the drill template. The drill sleeve is coaxial with the pin hole on the inner arc surface of the connecting rod cover, so that the drill bit of the drilling equipment passes through the drill sleeve to drill the pin hole.

[0005] As a further optimization, the sleeve hole is an oblong hole; an adjustable support nail is fixedly connected to the upright plate; one end of the adjustable support nail supports the first pressure plate.

[0006] As a further optimization, a spring is fitted onto the first stud, with the two ends of the spring supporting the first handle and the connecting plate, respectively.

[0007] As a further optimization, the drill template is provided with positioning holes, and the drill sleeve is detachably connected to the positioning holes.

[0008] As a further optimization, the inclination angle of the vertical plate is consistent with the angle between the mating surface of the shim hole and one end of the connecting rod cover, so that the drill sleeve and the shim hole are coaxial.

[0009] As a further optimization, the upright plate is provided with a vertical groove to prevent the drill bit from interfering with the upright plate.

[0010] As a further optimization, a detachable positioning plate is provided on one side of the connecting plate, and the side of the positioning plate is the positioning surface.

[0011] The present invention also provides a method for machining the pin hole of a connecting rod cover, which utilizes the above-described positioning and clamping device for machining the pin hole of the connecting rod cover, and includes the following steps.

[0012] S1: Device installation: The connecting rod bearing pin hole machining positioning clamping device is hoisted onto the worktable of the radial drilling machine and installed on the worktable via the base plate.

[0013] S2: Equipment adjustment: Install the drill bit and drill bushing onto the radial drilling machine and the connecting rod bearing pin hole machining positioning clamping device, respectively. Adjust the position of the base plate and slowly move the radial arm of the drilling machine to drive the drill bit down until the drill bit is aligned with the drill bushing. Then insert the drill bit into the drill bushing, lock the radial arm and the spindle box to fix the position of the drill bit, and then move the drill bit up.

[0014] S3: Workpiece installation: Fit the two threaded connection holes of the connecting rod cover onto the diamond pin and the positioning pin respectively, so that the mating surface of the connecting rod cover supports the upright plate and the side of the connecting rod cover is in close contact with the positioning surface. Rotate the first handle and the second handle to press the first pressure plate and the second pressure plate firmly against the workpiece.

[0015] S4: Bottom hole machining. Start the radial drilling machine and drill to the specified depth according to the process requirements. After drilling is completed, the drill bit is withdrawn from the workpiece.

[0016] S5: Reaming. Replace the machining tool with a reamer and the matching drill bushing. Then start the radial drilling machine to ream to the specified depth and then the reamer will withdraw from the workpiece.

[0017] S6: Remove the workpiece, and release the first and second pressure plates by using the first and second handles to remove the workpiece.

[0018] S7: Inspection. Use a plug gauge and vernier caliper to inspect the diameter and depth of the pin hole. If the inspection is qualified, the processing ends; otherwise, proceed to step S8.

[0019] S8: Repeat S3-S7 until the processing is qualified.

[0020] The advantages of this invention are that it can perform the machining of connecting rod cover pin holes on ordinary equipment, reducing production costs, and at the same time, the increased rigidity of the machining tool can further improve machining accuracy and dimensional stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the planar structure of an embodiment of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0023] Figure 3 for Figure 1 The left view, excluding the first handle, the first pressure plate, and the spring.

[0024] Figure 4 This is a three-dimensional structural diagram of the connecting rod cover according to an embodiment of the present invention.

[0025] Figure 5 This is a three-dimensional structural diagram of the connecting rod cover in an embodiment of the present invention.

[0026] Figure 6 This is a cross-sectional structural diagram of the connecting rod cover in an embodiment of the present invention.

[0027] The technical features in the figure correspond to the reference numerals as follows: clamp body 1; positioning block 2; diamond pin 3; positioning nail 4; positioning plate 5; connecting plate 6; drill template 7; drill sleeve 8; spring 9; first pressure plate 10; first handle 11; adjustable support nail 12; base plate 13; upright plate 14; second pressure plate 15; second handle 16; first stud 17; second stud 18; sleeve hole 19; notch 20; guide hole 21; groove 22; connecting rod cover 30; side of connecting rod cover 31; mating surface 32; inner arc surface 33; threaded connection hole 34; bearing pin hole 35. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some preferred embodiments of the present invention, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] Example; please refer to Figure 1-6This invention provides a clamping and positioning device for machining the pin hole of a connecting rod cover, comprising a clamping body 1, a positioning block 2, a diamond-shaped pin 3, a positioning nail 4, a drill template 7, a drill sleeve 8, a connecting plate 6, a positioning plate 5, and a clamping mechanism; the clamping body 1 is generally T-shaped, and the inclination angle of its upright plate 14 is consistent with the angle between the pin hole 35 and the mating surface 32. The left and right sides of the upright plate 14 are respectively fixed to the positioning block 2, the positioning nail 4, the connecting plate 6, the adjustable support nail 12, and the drill template 7 for guiding drilling, and the upright plate 14 is provided with a groove 22 for the machining tool to pass through; the positioning plate 5 is fixed to the connecting plate 6 for positioning the workpiece in the front and rear directions and ensuring the width dimension of the pin hole 35; at the same time, vertical clamping plates are respectively fixed to the connecting plate 6. The double-ended studs in the straight and parallel directions are used to clamp the workpiece with the help of the handle, pressure plate and adjustable support pin 12; the positioning block 2 has a through hole in the middle for fixing the diamond pin 3, the diamond pin 3 is used for vertical positioning of the workpiece, the positioning block 2 and the positioning pin 4 are used for lateral positioning of the workpiece and the angle of the pin hole 35; the drill template 7 is L-shaped, the inclination angle of the horizontal plate is consistent with the angle between the pin hole 35 and the mating surface 32, and the horizontal plate has a through hole for positioning the drill sleeve 8 and for guiding the machining of the pin hole 35; the inner hole size of the drill sleeve 8 is 0.01mm-0.025mm larger than the diameter of the machining tool to improve the rigidity of the tool, and the drill sleeve 8 has a replacement pin hole; the center of the drill sleeve 8 is a guide hole 21 to guide the drill through.

[0030] Preferably, the connecting plate 6 and the clamping body 1 are provided with stiffening plates to strengthen the clamping strength.

[0031] Preferably, the pressure plate that cooperates with the adjustable support nail 12 is provided with a groove 22, and a spring 9 is provided between the pressure plate and the connecting plate 6 to facilitate quick pressing.

[0032] Preferably, the clamping body 1 has a through hole on the upright plate 14 for quick replacement of the drill sleeve 8, and quick replacement is achieved by the cooperation of a slender pin with the pin hole on the drill sleeve 8.

[0033] When using it, the following steps are included.

[0034] S1: Device installation: The connecting rod bearing pin hole machining positioning clamping device is hoisted onto the worktable of the radial drilling machine and installed on the worktable via the base plate 13;

[0035] S2: Equipment adjustment: Install the drill bit and drill sleeve 8 onto the radial drilling machine and the connecting rod bearing pin hole machining positioning clamping device, adjust the position of the base plate 13, and slowly move the radial arm of the drilling machine to drive the drill bit down until the drill bit is aligned with the drill sleeve 8. Then insert the drill bit into the drill sleeve 8, lock the radial arm and the spindle box to fix the position of the drill bit, and then move the drill bit up.

[0036] S3: Workpiece installation: The two threaded connection holes 34 of the connecting rod cover 30 are respectively fitted onto the diamond pin 3 and the positioning nail 4, so that the mating surface 32 of the connecting rod cover 30 supports the upright plate 14 and the side of the connecting rod cover 30 is close to the positioning surface. Rotate the first handle 11 and the second handle 16 so that the first pressure plate 10 and the second pressure plate 15 press the workpiece.

[0037] S4: Bottom hole machining. Start the radial drilling machine and drill to the specified depth according to the process requirements. After drilling is completed, the drill bit is withdrawn from the workpiece.

[0038] S5: Reaming. Replace the machining tool with a reamer and replace the matching drill bushing 8. Then start the radial drilling machine to ream to the specified depth and then the reamer will withdraw from the workpiece.

[0039] S6: Remove the workpiece, and release the first pressure plate 10 and the second pressure plate 15 through the first handle 11 and the second handle 16 to remove the workpiece;

[0040] S7: Inspection. Use a plug gauge and vernier caliper to inspect the diameter and depth of the 35mm diameter hole for the pad pin. If the inspection is satisfactory, the machining process ends; otherwise, proceed to step S8.

[0041] S8: Repeat S3-S7 until the processing is qualified.

[0042] The advantage of this device is that it can perform 35mm connecting rod bearing pin hole machining on ordinary equipment, reducing production costs. At the same time, the increased rigidity of the machining tool can further improve machining accuracy and dimensional stability.

[0043] As can be seen, to achieve the above-mentioned effects, the positioning and clamping device of this embodiment includes at least a clamping body 1, which includes a base plate 13 for mounting to a drilling device; an inclined vertical plate 14 fixedly connected to the base plate 13; positioning pins 4 and diamond-shaped pins 3 arranged vertically and horizontally fixedly connected to one side of the vertical plate 14, respectively for insertion into two threaded connection holes 34 of the connecting rod cover 30; a connecting plate 6 with one end fixedly connected to the side of the vertical plate 14, the side facing the positioning pin being a positioning surface for fitting against the side of the connecting rod cover 30; a first stud 17 fixedly connected to its outer end, a first handle 11 screwed onto the first stud 17; and a first pressure plate 10 fitted onto the first stud 17 through a pre-set sleeve hole 19 in its middle. When the first handle 11 is tightened, the first pressure plate 10 presses against the top of the outer arc surface of the connecting rod cover 30; the second stud 18 is fixedly connected in the middle of the positioning surface; the second handle 16 is screwed onto the second stud 18; the second pressure plate 15 is fitted onto the second stud 18 through a pre-set notch 20 in the middle, so that when the second handle 16 is tightened, the connecting plate 6 and the second pressure plate 15 respectively press against the left and right sides of the connecting rod cover 30; the lower side of the upright plate 14 is fixedly connected to the drill template 7, and the drill sleeve 8 is fixedly connected to the drill template 7. The drill sleeve 8 is coaxial with the pin hole 35 on the inner arc surface 33 of the connecting rod cover 30, so that the drill bit of the drilling equipment passes through the drill sleeve 8 to drill the pin hole 35.

[0044] Even better, the sleeve hole 19 is an elongated oval hole; an adjustable support pin 12 is fixedly connected to the upright plate 14; one end of the adjustable support pin 12 supports the first pressure plate 10, which can provide more support force for the first pressure plate 10, making the first pressure plate 10 more stable when pressing the connecting rod cover 30. The elongated oval hole can not only limit the angle of the first pressure plate 10, but also drive the first pressure plate 10 to move horizontally, so as to put or take off the connecting rod cover 30 without completely removing the first handle 11, making it more convenient to use.

[0045] A spring 9 is fitted onto the first stud 17, with its two ends supporting the first handle 11 and the connecting plate 6, respectively. The spring 9 controls the first pressure plate 10 to be in a stressed and tightened state, preventing displacement of the first pressure plate 10 and facilitating quick assembly and disassembly.

[0046] For easy replacement, the drill template 7 is provided with positioning holes, and the drill sleeve 8 is detachably connected to the positioning holes. The drill sleeve 8 can be easily replaced after wear.

[0047] The inclination angle of the upright plate 14 is consistent with the angle between the mating surface 32 of the pin hole 35 and one end of the connecting rod cover 30, so that the drill sleeve 8 and the pin hole 35 are coaxial, thereby ensuring the drilling accuracy.

[0048] The upright plate 14 is provided with a vertical groove 22 to prevent the drill bit from interfering with the upright plate 14.

[0049] To facilitate replacement after wear, a detachable positioning plate 5 is provided on one side of the connecting plate 6, and the side of the positioning plate 5 is the positioning surface.

[0050] The parts of this invention not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A clamping and positioning device for machining pin holes of connecting rod cover tiles, comprising a clamping body (1), wherein the clamping body (1) includes a base plate (13) for mounting onto a drilling equipment; characterized in that: An inclined vertical plate (14) is fixed to the base plate (13); a positioning pin (4) and a diamond pin (3) arranged vertically and horizontally are fixed to one side of the vertical plate (14), which are respectively used to be inserted into the two threaded connection holes (34) of the connecting rod cover (30); one end of the connecting plate (6) is fixed to the side of the vertical plate (14), and its side facing the positioning pin (4) is a positioning surface for fitting the side of the connecting rod cover (30); its outer end is fixed to the first stud (17), and the first handle (11) is screwed onto the first stud (17); the first pressure plate (10) passes through the sleeve preset in the middle. Hole (19) is fitted onto the first stud (17) for pressing the first pressure plate (10) against the top of the outer arc surface of the connecting rod cover (30) when the first handle (11) is tightened; the second stud (18) is fixedly connected in the middle of the positioning surface; the second handle (16) is screwed onto the second stud (18); the second pressure plate (15) is fitted onto the second stud (18) through a pre-set notch (20) in the middle, for pressing the connecting plate (6) and the second pressure plate (15) against the left and right sides of the connecting rod cover (30) respectively when the second handle (16) is tightened; The lower side of the vertical plate (14) is fixed to the drilling template (7), and the drilling template (7) is fixed to the drilling sleeve (8). The drilling sleeve (8) is coaxial with the pin hole (35) on the inner arc surface (33) of the connecting rod cover (30), so that the drill bit of the drilling equipment can pass through the drilling sleeve (8) to drill the pin hole (35).

2. The connecting rod cover pin hole machining positioning clamping device according to claim 1, characterized in that: The sleeve hole (19) is an oblong hole; an adjustable support nail (12) is fixedly connected to the upright plate (14); one end of the adjustable support nail (12) supports the first pressure plate (10).

3. The connecting rod cover pin hole machining positioning clamping device according to claim 2, characterized in that: A spring (9) is fitted on the first stud (17), and the two ends of the spring (9) support the first handle (11) and the connecting plate (6) respectively.

4. The connecting rod cover pin hole machining positioning clamping device according to claim 1, characterized in that: The drill template (7) is provided with a positioning hole, and the drill sleeve (8) is detachably connected to the positioning hole.

5. The connecting rod cover pin hole machining positioning clamping device according to claim 1, characterized in that: The inclination angle of the vertical plate (14) is consistent with the angle between the mating surface (32) of the pad pin hole (35) and one end of the connecting rod cover (30), so that the drill sleeve (8) and the pad pin hole (35) are coaxial.

6. The connecting rod cover pin hole machining positioning clamping device according to claim 1, characterized in that: The upright plate (14) is provided with a vertical groove (22) to prevent the drill bit from interfering with the upright plate (14).

7. The connecting rod cover pin hole machining positioning clamping device according to claim 3, characterized in that: The connecting plate (6) has a detachable connecting positioning plate (5) on one side, and the side of the positioning plate (5) is the positioning surface.

8. A method for machining the pin hole of a connecting rod cover, characterized in that, The connecting rod cover pin hole machining positioning and clamping device according to any one of claims 1-7 includes the following steps: S1: Device installation: The connecting rod bearing pin hole machining positioning clamping device is hoisted onto the worktable of the radial drilling machine and installed on the worktable through the base plate (13); S2: Equipment adjustment: Install the drill bit and drill sleeve (8) onto the radial drilling machine and the connecting rod bearing pin hole machining positioning clamping device respectively. Adjust the position of the base plate (13) and slowly move the radial arm of the drilling machine to drive the drill bit down until the drill bit is aligned with the drill sleeve (8). Then insert the drill bit into the drill sleeve (8), lock the radial arm and the spindle box to fix the position of the drill bit, and then move the drill bit up. S3: Workpiece installation: The two threaded connection holes (34) of the connecting rod cover (30) are respectively fitted onto the diamond pin (3) and the positioning pin (4), and the mating surface (32) of the connecting rod cover (30) supports the upright plate (14), and the side of the connecting rod cover (30) is close to the positioning surface. Rotate the first handle (11) and the second handle (16) so that the first pressure plate (10) and the second pressure plate (15) press the workpiece. S4: Bottom hole machining. Start the radial drilling machine and drill to the specified depth according to the process requirements. After drilling is completed, the drill bit is withdrawn from the workpiece. S5: Reaming process. Replace the machining tool with a reamer and replace the matching drill bushing (8). Then start the radial drilling machine to ream to the specified depth and then the reamer will withdraw from the workpiece. S6: Remove the workpiece, and release the first pressure plate (10) and the second pressure plate (15) through the first handle (11) and the second handle (16) to remove the workpiece; S7: Inspection. Use a plug gauge and vernier caliper to inspect the diameter and depth of the pin hole (35). If the inspection is qualified, the processing ends; if not, proceed to step S8. S8: Repeat S3-S7 until the processing is qualified.

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