Machining device and method for main and auxiliary connecting rods of diesel engine

Abstract

The invention provides a machining device and method for a main and auxiliary connecting rod of a diesel engine. The machining device comprises a fine boring base, a connecting rod large end positioning assembly and a connecting rod small end positioning assembly. The connecting rod big end positioning assembly comprises a positioning block and two positioning plates which are oppositely arranged, and the positioning block, the two positioning plates and the fine boring base jointly form a first positioning gap used for containing the connecting rod big end; the connecting rod small end positioning assembly comprises a positioning block, a positioning plate and a floating supporting block, a V-shaped groove is formed in the side wall, close to the connecting rod small end, of the positioning block, the V-shaped groove of the positioning block, the positioning plate and the fine boring base jointly form a second positioning gap used for containing the connecting rod small end, and the floating supporting block is aligned to the positioning plate. According to the machining device and method, the connecting rod can be positioned, pressed and fixed for fine boring machining, error accumulation of connecting rod machining is eliminated by adjusting the height of the floating supporting block, the machining device and method are suitable for machining connecting rods of various types and specifications, fixing is reliable, dismounting and mounting are convenient, and the positioning precision and machining precision of the connecting rod are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine connecting rod manufacturing, and in particular relates to a processing device and method for main and auxiliary connecting rods of a diesel engine. Background Art

[0002] As an important transmission component inside a diesel engine, the connecting rod can transfer the thrust of the piston generated by the combustion of diesel in the cylinder to the crankshaft and convert it into torque, so that the crankshaft rotates and outputs power to the outside, driving the load operation of the diesel engine. Increasing the number of diesel engine cylinders can increase the output power of the diesel engine. The use of a V-shaped or W-shaped cylinder arrangement can reduce the length of the diesel engine crankshaft, appropriately reduce the size of the diesel engine, and reduce the manufacturing and maintenance costs of the diesel engine. Diesel engines with V-shaped or W-shaped cylinder arrangements mostly use main and auxiliary connecting rods. The traditional main and auxiliary connecting rod processing process is long and has many processes. The positioning methods between each process are different, and the consistency of the clamping position cannot be guaranteed. It is impossible to adjust according to the actual processing size of the connecting rod, resulting in large errors during multiple clamping processes, causing the processing accuracy of the main and auxiliary connecting rods to fail to meet relevant requirements. Summary of the invention

[0003] In view of this, the present invention aims to provide a processing device and method for the main and auxiliary connecting rods of a diesel engine, so as to ensure the processing accuracy and processing efficiency of the main and auxiliary connecting rods.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] In a first aspect, a processing device for a main and auxiliary connecting rod of a diesel engine includes a precision boring base, a connecting rod big end positioning assembly and a connecting rod small end positioning assembly, wherein the connecting rod big end positioning assembly and the connecting rod small end positioning assembly are respectively arranged at two ends of the top surface of the precision boring base;

[0006] The connecting rod big end positioning assembly comprises a first positioning block, a first positioning plate and a second positioning plate, the first positioning block is arranged on the top surface of the precision boring base, the first positioning plate is arranged above the first positioning block, the second positioning plate is arranged above the precision boring base, and the second positioning plate is aligned with the first positioning plate, the first positioning block, the first positioning plate, the second positioning plate and the top surface of the precision boring base jointly form a first positioning gap for accommodating the connecting rod big end;

[0007] The connecting rod small end positioning assembly includes a second positioning block, a third positioning plate and a floating support block. The second positioning block is arranged on the top surface of the precision boring base. The side wall of the second positioning block close to the connecting rod small end is provided with a V-shaped groove. The third positioning plate is arranged above the precision boring base. The V-shaped groove of the second positioning block, the third positioning plate and the top surface of the precision boring base jointly form a second positioning gap for accommodating the connecting rod small end. The floating support block is arranged on the top surface of the precision boring base, and the top surface of the floating support block is relatively aligned with the end of the third positioning plate close to the connecting rod small end.

[0008] Furthermore, a pre-tightening positioning assembly is provided between the connecting rod big end positioning assembly and the connecting rod small end positioning assembly, and the pre-tightening positioning assembly includes a pre-tightening positioning plate and a pre-tightening positioning support. The pre-tightening positioning plate is arranged above the precision boring base through the pre-tightening positioning support, and a pre-tightening gap for accommodating the connecting rod body is formed between the pre-tightening positioning plate and the precision boring base.

[0009] Furthermore, the connecting rod big end positioning assembly also includes a first pad and a second pad, the first pad is arranged on the top surface of the precision boring base, and the first pad is relatively aligned with the end of the first positioning plate near the big end of the connecting rod, and the second pad is arranged on the top surface of the precision boring base, and the second pad is relatively aligned with the end of the second positioning plate near the big end of the connecting rod.

[0010] Furthermore, anti-slip pads are provided on the bottom surfaces of the first positioning plate, the second positioning plate and the third positioning plate.

[0011] Furthermore, the pre-tightening positioning plate is rotatably connected to the top end of the pre-tightening positioning support, and the bottom end of the pre-tightening positioning support is fixedly connected to the top surface of the precision boring base.

[0012] In a second aspect, a method for processing a main and auxiliary connecting rod of a diesel engine is provided, using the processing device for processing a main and auxiliary connecting rod of a diesel engine, wherein the method comprises the following steps:

[0013] Step S1: pre-processing the connecting rod;

[0014] Step S2: rough machining the connecting rod;

[0015] Step S3: performing fine milling on the connecting rod;

[0016] Step S4: performing precision boring on the connecting rod;

[0017] The precision boring process comprises:

[0018] Step S4-1: placing the small end of the connecting rod in the V-shaped groove of the second positioning block of the processing device;

[0019] Step S4-2: The small end of the connecting rod is pressed against the V-shaped groove and the large end of the connecting rod is rotated until the large end of the connecting rod is pressed against the side wall of the first positioning block of the processing device;

[0020] Step S4-3: operating the pre-tightening positioning plate of the processing device to press the connecting rod shaft;

[0021] Step S4-4: operating the first positioning plate and the second positioning plate of the processing device to press the connecting rod big end to fix the connecting rod big end;

[0022] Step S4-5: adjusting the height of the floating support block of the processing device to control the posture of the connecting rod;

[0023] Step S4-6: operate the third positioning plate of the processing device to press the small end of the connecting rod to fix the small end of the connecting rod.

[0024] Furthermore, in the step S4-2, after the big end of the connecting rod abuts against the side wall of the first positioning block, the bottom surface of the big end of the connecting rod can contact the first cushion block and the second cushion block of the processing device.

[0025] Furthermore, the pre-processing includes connecting rod end surface processing and three-hole drilling and boring processing.

[0026] Furthermore, the three-hole drilling and boring includes drilling and boring the connecting rod big end hole, drilling and boring the connecting rod small end hole and drilling and boring the connecting rod ear hole.

[0027] Furthermore, the rough machining includes rough milling and rough boring.

[0028] Compared with the prior art, the processing device and method of the main and auxiliary connecting rods of a diesel engine described in the present invention have the following advantages:

[0029] (1) The processing device described in the present invention positions the small end of the connecting rod through the V-groove of the second positioning block, and uses the first positioning block and the second positioning block to cooperate to position the big end of the connecting rod, and then uses the first positioning plate and the second positioning plate to press and fix the big end of the connecting rod. By adjusting the height of the floating support block, the error accumulation in the connecting rod processing process can be effectively eliminated, and it can be suitable for the processing of connecting rods of various models and specifications. Then, the third positioning plate is used to press the end of the connecting rod body close to the small end of the connecting rod, and then the small end of the connecting rod is fixed. The connecting rod can be reliably fixed during the precision boring process. The connecting rod is easy to disassemble and assemble, and is convenient for positioning during processing, thereby ensuring the positioning accuracy and processing accuracy of the connecting rod processing.

[0030] (2) After the processing device described in the present invention uses the first positioning block and the second positioning block to preliminarily position the connecting rod, it can first use the pre-tightening positioning plate to press the connecting rod body to preliminarily position the connecting rod, which can effectively avoid the displacement of the connecting rod caused by the subsequent operation of the first positioning plate, the second positioning plate and the third positioning plate to fix the big end and the small end of the connecting rod respectively, thereby ensuring the positioning accuracy and processing accuracy of the connecting rod. The first cushion block and the second cushion block arranged below the first positioning plate and the second positioning plate can cooperate with the first positioning plate and the second positioning plate to fix the big end of the connecting rod, so that the big end of the connecting rod keeps a distance from the top surface of the precision boring base, which is convenient for precision boring processing and ensures the adjustment space for adjusting the height of the small end of the connecting rod using the floating support block. By providing an anti-slip pad on the bottom surface where the first positioning plate, the second positioning plate and the third positioning plate contact the connecting rod, the connecting rod can be fixed more stably.

[0031] (3) The processing method described in the present invention utilizes the processing device to fix the big end of the connecting rod and then adjust the height of the small end of the connecting rod through a floating support block, thereby integrating and reducing the pre-processing process, rough milling process, rough boring process, fine milling process and fine boring process of the connecting rod. In the fine boring process, the big end hole, small end hole and ear hole of the connecting rod can be processed at one time through only one clamping, thereby better ensuring the shape and position tolerance requirements of the three holes and avoiding the error accumulation caused by repeated clamping.

[0032] (4) When the processing method described in the present invention is used to process the main connecting rod and the secondary connecting rod, a clamp that matches the processing process can be used to fix the connecting rod on the machine tool. After integrating and reducing similar processes, multiple processing processes of the same type can be completed with only one clamping, which reduces the number of clamping times. In addition, the clamp can be used for the processing of the main connecting rod and the secondary connecting rod at the same time, which reduces the number of clamp types and improves the scope of application of the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a structural schematic diagram of a processing device for a main and auxiliary connecting rod of a diesel engine according to the first embodiment of the present invention;

[0035] Figure 2 Another schematic structural diagram of a processing device for a main and auxiliary connecting rod of a diesel engine according to the first embodiment of the present invention;

[0036] Figure 3 It is a front view of a processing device for a main and auxiliary connecting rod of a diesel engine according to the first embodiment of the present invention;

[0037] Figure 4Another front view of the processing device for the main and auxiliary connecting rods of a diesel engine according to the first embodiment of the present invention;

[0038] Figure 5 This is a flow chart of a method for processing a main and auxiliary connecting rod of a diesel engine according to a second embodiment of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the milling processing assembly according to the first embodiment of the present invention;

[0040] Figure 7 It is another structural schematic diagram of the milling processing assembly according to the first embodiment of the present invention;

[0041] Figure 8 It is a front view of the milling assembly according to the first embodiment of the present invention;

[0042] Fig. 9 Another front view of the milling assembly according to the first embodiment of the present invention;

[0043] Fig.10 This is a schematic structural diagram of a rough boring assembly according to Embodiment 1 of the present invention;

[0044] Fig.11 Another structural schematic diagram of the rough boring assembly according to the first embodiment of the present invention;

[0045] Fig.12 It is a front view of the rough boring assembly according to the first embodiment of the present invention;

[0046] Fig.13 Another front view of the rough boring assembly according to the first embodiment of the present invention;

[0047] Description of reference numerals:

[0048] 101-connecting rod body; 102-connecting rod big end; 103-connecting rod small end; 104-connecting rod big end hole; 105-connecting rod small end hole; 106-connecting rod ear hole; 201-first mounting bolt; 202-precision boring base; 203-third positioning plate; 204-first positioning plate; 205-first positioning block; 206-second positioning plate; 207-preload positioning plate; 208-second positioning block; 209-first cushion block; 210-second cushion block; 211-floating support block; 212-second positioning support pillar; 213-preload positioning support pillar; 214-third positioning support pillar; 215-first positioning support pillar; 301-second mounting Bolt; 302-second support plate; 303-second clamping plate; 304-first clamping plate; 305-adjusting groove; 306-first fixing block; 307-first clamping nut; 308-milling base; 309-second clamping nut; 310-first support plate; 311-second fixing block; 401-third mounting bolt; 402-second locking plate; 403-second locking pillar; 404-first locking plate; 405-first locking shaft; 406-first locking block; 407-rough boring base; 408-second locking block; 409-first locking pillar; 410-second support block; 411-first support block. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0052] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0053] Embodiment 1

[0054] A processing device for main and auxiliary connecting rods of a diesel engine, comprising a precision boring base 202, a connecting rod big end positioning assembly and a connecting rod small end positioning assembly, wherein the connecting rod big end positioning assembly and the connecting rod small end positioning assembly are respectively arranged at two ends of the top surface of the precision boring base;

[0055] The connecting rod big end positioning assembly includes a first positioning block 205, a first positioning plate 204 and a second positioning plate 206, wherein the first positioning block is arranged on the top surface of the precision boring base, the first positioning plate is arranged above the first positioning block, the second positioning plate is arranged above the precision boring base, and the second positioning plate is aligned with the first positioning plate, and the first positioning block, the first positioning plate, the second positioning plate and the top surface of the precision boring base jointly form a first positioning gap for accommodating the connecting rod big end 102;

[0056] The precision boring base is used to fix the processing device on the machine tool when the connecting rod is precision boring. The two ends of the precision boring base are respectively provided with first mounting bolts 201 for connecting with the precision boring machine tool. The first positioning block is fixedly connected to the top surface of the precision boring base. The side wall of the first positioning block close to the connecting rod big end is perpendicular to the top surface of the precision boring base. The first positioning block can resist the side wall of the connecting rod big end to position the connecting rod big end. The first positioning plate is arranged on the precision boring base through the first positioning pillar 215. The end of the first positioning plate away from the connecting rod big end is rotatably connected to the top of the first positioning pillar. The bottom end of the first positioning pillar is fixed on the precision boring base. The first positioning pillar is located on the side of the first positioning block away from the connecting rod big end. The first positioning plate extends from the top of the first positioning pillar to the direction close to the connecting rod big end, and crosses the top of the first positioning block to extend to the top surface of the connecting rod big end. The first positioning plate can be rotated around the top of the first positioning pillar to open or press on the top surface of the connecting rod big end. The second positioning plate is arranged on the precision boring base through the second positioning pillar 212. The end of the second positioning plate away from the connecting rod big end is rotatably connected to the top of the second positioning pillar. The bottom end of the second positioning pillar is fixed on the precision boring base. The second positioning plate can be rotated around the top of the second positioning pillar to open or press on the top surface of the connecting rod big end. The first positioning plate and the second positioning plate are arranged opposite to each other, and can press the connecting rod big end in two opposite directions to stably fix the connecting rod big end. At the same time, in order to avoid hindering the precision boring of the connecting rod big end hole 104, the ends of the first positioning plate and the second positioning plate close to the connecting rod big end are both located outside the connecting rod big end hole.

[0057] The connecting rod small end positioning assembly includes a second positioning block 208, a third positioning plate 203 and a floating support block 211. The second positioning block is arranged on the top surface of the precision boring base. The side wall of the second positioning block close to the connecting rod small end 103 is provided with a V-shaped groove. The third positioning plate is arranged above the precision boring base, and the V-shaped groove of the second positioning block, the third positioning plate and the top surface of the precision boring base jointly form a second positioning gap for accommodating the connecting rod small end. The floating support block is arranged on the top surface of the precision boring base, and the top surface of the floating support block is relatively aligned with the end of the third positioning plate close to the connecting rod small end.

[0058] The second positioning block is fixedly connected to the top surface of the precision boring base, the V-shaped groove on the side wall of the second positioning block can accommodate the small end of the connecting rod, and can cooperate with the arc-shaped side surface of the small end of the connecting rod to limit the small end of the connecting rod. The third positioning plate is set on the precision boring base through the third positioning pillar 214, and the end of the third positioning plate away from the small end of the connecting rod is rotatably connected to the top end of the third positioning pillar. The bottom end of the third positioning pillar is fixed on the precision boring base. The third positioning plate can be rotated around the top end of the third positioning pillar to open or press on the top surface of one end of the connecting rod body 101 close to the small end of the connecting rod to fix the small end of the connecting rod without hindering the precision boring processing of the small end hole 105 of the connecting rod. Precision boring is often a connecting rod processing step after rough machining. Therefore, in order to avoid the accumulation of errors in the connecting rod processing caused by the previous steps, a floating support block is provided on the top surface of the precision boring base below the third positioning plate. A clamping gap for accommodating and clamping the connecting rod body near the small head of the connecting rod is formed between the top surface of the floating support block and the end of the third positioning plate near the small head of the connecting rod. The height of the top surface of the floating support block can be adjusted to adjust the clamping height of the connecting rod body near the small head of the connecting rod, and then the height of the small head of the connecting rod can be adjusted to adjust the connecting rod to a posture that meets relevant requirements, such as a horizontal posture, and then precision boring can be performed. This can better guarantee the processing accuracy of the connecting rod.

[0059] Optionally, in order to facilitate the fixing of the connecting rod, a pre-tightening positioning assembly is further provided between the connecting rod big end positioning assembly and the connecting rod small end positioning assembly, and the pre-tightening positioning assembly includes a pre-tightening positioning plate 207 and a pre-tightening positioning pillar 213. The pre-tightening positioning plate is arranged above the precision boring base through the pre-tightening positioning pillar, and a pre-tightening gap for accommodating the connecting rod shaft is formed between the pre-tightening positioning plate and the precision boring base. The pre-tightening positioning plate is rotatably connected to the top end of the pre-tightening positioning pillar, and the bottom end of the pre-tightening positioning pillar is fixedly connected to the top surface of the precision boring base.

[0060] The pre-tightening positioning plate is arranged between the first positioning plate and the third positioning plate, and the end of the pre-tightening positioning plate close to the connecting rod is located on the top surface of the connecting rod shaft, and the pre-tightening positioning plate can be rotated around the top end of the pre-tightening positioning support to open or press on the top surface of the connecting rod shaft. After the connecting rod is initially positioned by the first positioning block and the second positioning block, the connecting rod shaft can be pressed by the pre-tightening positioning plate to initially position the connecting rod, and then the connecting rod can be fixed by the first positioning plate, the second positioning plate and the third positioning plate to prevent the connecting rod from shifting when operating the first positioning plate, the second positioning plate or the third positioning plate, resulting in inaccurate positioning of the connecting rod.

[0061] An optional implementation of the present embodiment is that, in order to reserve processing space for the precision boring processing of the connecting rod, the connecting rod big end positioning assembly also includes a first pad 209 and a second pad 210, the first pad is arranged on the top surface of the precision boring base, and the first pad is aligned with the end of the first positioning plate close to the big end of the connecting rod, and the second pad is arranged on the top surface of the precision boring base, and the second pad is aligned with the end of the second positioning plate close to the big end of the connecting rod.

[0062] The first pad and the second pad are both fixedly connected to the top surface of the precision boring base. The top surface height of the first pad is the same as the top surface height of the second pad. The top surfaces of the first pad and the second pad are respectively in contact with the bottom surface of the big end of the connecting rod. The first pad and the second pad can raise the connecting rod so that the bottom surface of the connecting rod keeps a distance from the top surface of the precision boring base, which is convenient for precision boring of the big end hole and the small end hole of the connecting rod.

[0063] In order to prevent the connecting rod from moving during the processing, the bottom surfaces of the first positioning plate, the second positioning plate and the third positioning plate are all provided with anti-skid pads. The first positioning plate, the second positioning plate and the third positioning plate are all pressed on the top surface of the connecting rod through the anti-skid pads, which greatly increases the friction between the top surface of the connecting rod and can effectively prevent the connecting rod from shifting during the processing, resulting in the processing accuracy not meeting the requirements.

[0064] Exemplarily, the processing of the connecting rod shape can be carried out by milling, and the connecting rod needs to be fixed by a milling fixing assembly. The milling fixing assembly includes: a milling base 308, a connecting rod big end clamping unit and a connecting rod small end clamping unit. The connecting rod big end clamping unit and the connecting rod small end clamping unit are respectively arranged at the two ends of the top surface of the milling base; the milling base is used to fix the connecting rod on the machine tool during milling, and the two ends of the milling base are respectively provided with a second mounting bolt 301 for connecting to the machine tool.

[0065] The connecting rod big end clamping unit comprises: a first support plate 310, a first clamping plate 304, a first fixing block 306, a first clamping screw and a first clamping nut 307. The first support plate is fixedly arranged on the top surface of the milling processing base. The first support plate is circular. The diameter of the first support plate is smaller than the outer diameter of the connecting rod big end to be processed and larger than the inner diameter of the connecting rod big end hole, so as to pad the connecting rod to avoid hindering the milling processing of the connecting rod small end. The first clamping plate is arranged above the first support plate, and a first clamping gap for accommodating the connecting rod big end is formed between the first clamping plate and the first support plate. The first clamping plate is provided with an adjustment groove 305 for adjusting the clamping position of the first clamping plate. The first fixing block is arranged on the top of the first support plate. The size of the first fixing block is slightly smaller than the inner diameter of the connecting rod big end hole of the connecting rod to be processed. When the connecting rod big end is padded by the first support plate, the first fixing block can extend into the connecting rod big end hole and clamp the connecting rod big end, so that the connecting rod big end cannot move in the horizontal direction. The first support plate and the first positioning block are both provided with through holes for accommodating the first clamping screw. The self-milling base of the first clamping screw passes through the first support plate, the first positioning block, the big end hole of the connecting rod and the adjustment groove of the first clamping plate in sequence. The top end of the first clamping screw is located above the first clamping plate. The first clamping nut is threadedly connected to the top end of the first clamping screw. Rotating the first clamping nut can make the bottom surface of the first clamping nut press against the top surface of the first clamping plate, thereby clamping and fixing the big end of the connecting rod in the first clamping gap.

[0066] The connecting rod small end clamping unit includes: a second support plate 302, a second clamping plate 303, a second fixing block 311, a second clamping screw and a second clamping nut 309. The second support plate is arranged on the top surface of the milling-shaped base. The second support plate is circular. The diameter of the second support plate is smaller than the outer diameter of the connecting rod small end to be processed and larger than the inner diameter of the connecting rod small end hole, thereby paving the connecting rod to avoid hindering the milling processing of the connecting rod small end. A convex ring is provided on the outer wall of the second support plate. The outer diameter of the convex ring is larger than the outer diameter of the second support plate, and the top surface of the convex ring is lower than the top surface of the second support plate. The top surface of the convex ring and the top surface of the second support plate can be used to support connecting rod small ends of different models and sizes, thereby improving the application range of the milling processing fixing assembly. The second clamping plate is arranged above the second supporting plate, and a second clamping gap for accommodating the small end of the connecting rod is formed between the second clamping plate and the second supporting plate. The second fixing block is arranged at the top of the second supporting plate, and the size of the second fixing block is slightly smaller than the inner diameter of the small end hole of the connecting rod to be processed. When the small end of the connecting rod is padded by the second supporting plate, the second fixing block can extend into the small end hole of the connecting rod and clamp the small end of the connecting rod, so that the small end of the connecting rod cannot move in the horizontal direction. The second fixing block, the second supporting block, and the convex ring on the second supporting block form a stepped support and positioning structure, which can fix small ends of connecting rods of different sizes and is suitable for milling connecting rods of different models. The second support plate, the second fixed block and the second clamping plate are all provided with accommodating holes for accommodating the second clamping screw. The self-milling base of the second clamping screw passes through the second support plate, the second positioning block, the small end hole of the connecting rod and the second clamping plate in sequence and extends to above the second clamping plate. The second clamping nut is threadedly connected to the top end of the second clamping screw located above the second clamping plate. Rotating the second clamping nut can make the bottom surface of the second clamping nut press against the top surface of the second clamping plate, thereby fixing the small end of the connecting rod in the second clamping gap.

[0067] Exemplarily, the big end hole, small end hole and ear hole of the main connecting rod, and the big end hole and small end hole of the secondary connecting rod need to be rough bored. When performing the rough boring, the connecting rod needs to be fixed by a rough boring fixing assembly. The rough boring fixing assembly includes: a rough boring base 407, a connecting rod big end locking unit and a connecting rod small end locking unit. The connecting rod big end locking unit and the connecting rod small end locking unit are respectively arranged at both ends of the top surface of the rough boring base; the rough boring base is used to fix the connecting rod on the machine tool during the rough boring, and third mounting bolts 401 are respectively provided at both ends of the rough boring base for connecting to the machine tool.

[0068] The connecting rod big end locking unit includes: a first locking block 406, a first supporting block 411 and a first locking plate 404. The first locking block is fixedly connected to the top surface of the rough boring base. The side wall of the first locking block near the connecting rod big end is provided with a V-shaped groove. The side wall of the connecting rod ear can be against the V-shaped groove and the connecting rod big end is positioned through the V-shaped groove. The first supporting block is provided at the bottom end of the V-shaped groove. The top surface of the first supporting block can be against the bottom surface of the connecting rod big end to pad the connecting rod big end, so as to facilitate the rough boring of the connecting rod. The first locking plate is arranged on the rough boring base through the first locking pillar 409. The first locking plate is connected to the top end of the first locking pillar through the first locking shaft 405. The bottom end of the first locking pillar is fixed on the rough boring base. The first locking plate can be rotated around the top end of the first locking pillar to open or press on the top surface of the connecting rod big end. The first locking plate and the top surface of the rough boring base form a first locking gap for accommodating the connecting rod big end. A C-shaped groove is provided at one end of the first locking plate facing the first locking block, and both ends of the C-shaped groove are respectively located outside the big end hole of the connecting rod, and the arc sections of the C-shaped groove are all located outside the big end hole of the connecting rod, which will not hinder the rough boring processing of the connecting rod. The first locking plate with the C-shaped groove can easily and quickly lock or loosen the big end of the connecting rod.

[0069] The connecting rod small end locking unit includes a second locking block 408, a second supporting block 410 and a second locking plate 402. The second locking block is fixedly connected to the top surface of the rough boring base. The second locking block is provided with a V-shaped groove near the side wall of the connecting rod small end. The connecting rod small end can be pressed in the V-shaped groove and positioned by the V-shaped groove. A second supporting block is provided at the bottom end of the V-shaped groove. The top surface of the second supporting block can press against the bottom surface of the connecting rod small end to cushion the connecting rod small end, so as to facilitate the rough boring of the connecting rod. The second locking plate is arranged on the rough boring base through a second locking pillar 403. The second locking plate is rotatably connected to the top end of the second locking pillar. The bottom end of the second locking pillar is fixed to the rough boring base. The second locking plate can be rotated around the top end of the second locking pillar to open or press on the top surface of the connecting rod small end. The second locking plate and the top surface of the rough boring base form a second locking gap for accommodating the connecting rod small end.

[0070] Embodiment 2

[0071] A method for processing a main and auxiliary connecting rod of a diesel engine, using a processing device for processing a main and auxiliary connecting rod of a diesel engine, comprises the following steps:

[0072] Step S1: pre-processing the connecting rod;

[0073] Step S2: rough machining the connecting rod;

[0074] Step S3: performing fine milling on the connecting rod;

[0075] Step S4: performing precision boring on the connecting rod;

[0076] When processing the main and auxiliary connecting rods, the die forgings of the connecting rods need to be pre-processed first. For example, the pre-processing includes connecting rod end face processing and three-hole drilling and boring processing; first, the two end faces of the connecting rod die forging are milled and ground, and then the three holes of the connecting rod are bored. The three-hole drilling and boring include drilling and boring the connecting rod big head hole, drilling and boring the connecting rod small head hole and drilling and boring the connecting rod ear hole 106. When drilling and boring the three holes of the main connecting rod, the three holes of the connecting rod are drilled and bored at the same time through one clamping. The relative position positioning between the three holes is accurate, which better guarantees the shape and position tolerance requirements of the three holes, and does not require the flow between processes, reducing logistics time and avoiding the accumulation of errors caused by repeated clamping. When drilling and boring the auxiliary connecting rod, the same processing method can be used, but since the auxiliary connecting rod only has a big head hole and a small head hole, the ear hole processing process is omitted.

[0077] The precision boring process comprises:

[0078] Step S4-1: placing the small end of the connecting rod in the V-shaped groove of the second positioning block of the processing device;

[0079] Step S4-2: The small end of the connecting rod is pressed against the V-shaped groove and the large end of the connecting rod is rotated until the large end of the connecting rod is pressed against the side wall of the first positioning block of the processing device;

[0080] Step S4-3: operating the pre-tightening positioning plate of the processing device to press the connecting rod shaft;

[0081] Step S4-4: operating the first positioning plate and the second positioning plate of the processing device to press the connecting rod big end to fix the connecting rod big end;

[0082] Step S4-5: adjusting the height of the floating support block of the processing device to control the posture of the connecting rod;

[0083] Step S4-6: operate the third positioning plate of the processing device to press the small end of the connecting rod to fix the small end of the connecting rod.

[0084] When the connecting rod is subjected to precision boring, it is necessary to first use the processing device to stably fix the connecting rod to ensure the precision of the precision boring of the connecting rod. First, the small end of the connecting rod is initially positioned through the V-groove of the processing device. At this time, the openings of the large end hole and the small end hole of the connecting rod are both facing the precision boring base, and the radial directions of the large end hole and the small end hole of the connecting rod are parallel to the top surface of the precision boring base, but the large end of the connecting rod can still rotate around the small end of the connecting rod. Then, the large end of the connecting rod is rotated toward the first positioning block of the processing device until the side wall of the large end of the connecting rod is against the side wall of the first positioning block. During the rotation, the small end of the connecting rod will not be separated from the V-groove and will always be tightly against the V-groove. After the large end of the connecting rod is against the first positioning block, the pre-tightening positioning plate is operated to rotate and press the top surface of the connecting rod body to initially position the connecting rod. After that, the first and second positioning plates can be operated to rotate and press on the top surface of the connecting rod big end to fix the connecting rod big end. Due to the presence of the pre-tightening positioning plate, the movement of the connecting rod during the operation of the first and second positioning plates is better avoided. After that, by adjusting the height of the top surface of the floating support block, the height of the small end of the connecting rod from the fine boring base is changed. After determining that the posture of the connecting rod meets the processing requirements, the third positioning plate is operated to press on the top surface of the connecting rod body near the small end of the connecting rod to fix the small end of the connecting rod. At this point, the big end and the small end of the connecting rod are both stably fixed, and because the floating support block adjusts the height of the small end of the connecting rod, the error accumulation of the connecting rod processing is eliminated, which can improve the processing accuracy of the connecting rod. After the connecting rod is fixed, the position coordinates of the big end hole and the small end hole of the connecting rod are measured by the Renishaw probe, and the fine boring of the big end hole, the small end hole and the ear hole of the connecting rod is carried out based on the coordinates of the small end hole of the connecting rod, and the positioning accuracy is accurate.

[0085] An optional implementation of this embodiment is that in step S4-2, after the connecting rod big end abuts against the side wall of the first positioning block, the bottom surface of the connecting rod big end can contact the first cushion block and the second cushion block of the processing device. After the connecting rod big end is positioned by the first positioning block and the second positioning block, the first cushion block and the second cushion block are needed to pad the connecting rod big end so that the connecting rod big end keeps a distance on the precision boring base, retaining the adjustment space of the floating support block to adjust the height of the connecting rod small end, and facilitating precision boring of the connecting rod big end hole.

[0086] Exemplarily, the rough machining includes rough milling and rough boring. Before the connecting rod is subjected to fine milling and fine boring, it is necessary to perform rough milling and rough boring on the connecting rod first. The rough milling and fine milling of the connecting rod can adopt the milling fixing assembly described in Example 1. The rough milling of the main connecting rod includes rough milling of the connecting rod shape, milling of wedge grooves and locking grooves, milling of small heads and ear slots. The fine milling includes fine milling of the shape and fine milling of the shape ear groove support. When machining the wedge grooves and locking grooves, milling is used instead of grinding, which can effectively improve the machining efficiency while ensuring the accuracy. When the connecting rod is subjected to rough boring, the rough boring fixing assembly described in Example 1 can be used. The rough boring includes rough boring of three holes and chamfering. By merging and reducing similar machining processes, the flow between machining processes is reduced, and the accuracy of positioning between the structures of various parts of the connecting rod is improved.

[0087] The process of fixing the connecting rod using the milling fixing assembly is: first, remove the first clamping nut and the second clamping nut of the milling fixing assembly, take out the first clamping plate and the second clamping plate, then align the big end hole and the small end hole of the connecting rod with the first fixing block and the second fixing block respectively, place the big end of the connecting rod on the first support plate, and place the small end of the connecting rod on the second support plate, then respectively put the first clamping plate and the second clamping plate on the first clamping screw and the second clamping screw, the first clamping plate is pressed on the top surface of the big end of the connecting rod, and the second clamping plate is pressed on the top surface of the small end of the connecting rod, then use the adjustment groove to adjust the position of the first clamping plate, and tighten the first clamping nut so that the first clamping plate presses and fixes the big end of the connecting rod, and then tighten the second clamping nut so that the second clamping plate presses and fixes the small end of the connecting rod. The positioning accuracy of the connecting rod is high, the connecting rod can be reliably clamped during the milling process, and the connecting rod can be clamped or disassembled conveniently and quickly.

[0088] The process of fixing the connecting rod using the rough boring fixing assembly is: first, rotate the first locking plate and the second locking plate to open, then press the small end of the connecting rod against the V-groove of the second locking block, rotate the big end of the connecting rod until the side wall of the connecting rod ear is stuck in the V-groove of the first positioning block, position the connecting rod through the two V-grooves, then press the first locking plate against the top surface of the big end of the connecting rod, and press the second locking plate against the top surface of the small end of the connecting rod, so that the connecting rod can be fixed quickly and reliably, and the connecting rod can be clamped or disassembled conveniently and quickly.

[0089] It should be noted that the structures of the main connecting rod and the auxiliary connecting rod of the main-auxiliary connecting rod are roughly the same, the difference is that the auxiliary connecting rod does not have an ear hole. Therefore, the processing procedure of the auxiliary connecting rod is basically the same as that of the main connecting rod, and only the ear hole processing procedure is excluded.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A processing device for main and auxiliary connecting rods of a diesel engine, characterized in that: include: A precision boring base (202), a connecting rod big end positioning assembly and a connecting rod small end positioning assembly, wherein the connecting rod big end positioning assembly and the connecting rod small end positioning assembly are respectively arranged at two ends of the top surface of the precision boring base (202); The connecting rod big end positioning assembly comprises a first positioning block (205), a first positioning plate (204) and a second positioning plate (206), wherein the first positioning block (205) is arranged on the top surface of the precision boring base (202), the first positioning plate (204) is arranged above the first positioning block (205), the second positioning plate (206) is arranged above the precision boring base (202), and the second positioning plate (206) is aligned with the first positioning plate (204), and the first positioning block (205), the first positioning plate (204), the second positioning plate (206) and the top surface of the precision boring base (202) jointly form a first positioning gap for accommodating the connecting rod big end (102); The connecting rod small end positioning assembly comprises a second positioning block (208), a third positioning plate (203) and a floating support block (211); the second positioning block (208) is arranged on the top surface of the precision boring base (202); a V-shaped groove is provided on the side wall of the second positioning block (208) close to the connecting rod small end (103); the third positioning plate (203) is arranged above the precision boring base (202); the V-shaped groove of the second positioning block (208), the third positioning plate (203) and the top surface of the precision boring base (202) jointly form a second positioning gap for accommodating the connecting rod small end (103); the floating support block (211) is arranged on the top surface of the precision boring base (202); and the top surface of the floating support block (211) is aligned with the end of the third positioning plate (203) close to the connecting rod small end (103).

2. A diesel engine main and auxiliary connecting rod processing device according to claim 1, characterized in that: A pre-tightening positioning assembly is also provided between the connecting rod big end positioning assembly and the connecting rod small end positioning assembly, and the pre-tightening positioning assembly includes a pre-tightening positioning plate (207) and a pre-tightening positioning support (213). The pre-tightening positioning plate (207) is arranged above the precision boring base (202) through the pre-tightening positioning support (213), and a pre-tightening gap for accommodating the connecting rod shaft (101) is formed between the pre-tightening positioning plate (207) and the precision boring base (202).

3. A diesel engine main and auxiliary connecting rod processing device according to claim 1, characterized in that: The connecting rod big end positioning assembly also includes a first pad (209) and a second pad (210), the first pad (209) is arranged on the top surface of the precision boring base (202), and the first pad (209) is relatively aligned with the end of the first positioning plate (204) close to the connecting rod big end, and the second pad (210) is arranged on the top surface of the precision boring base (202), and the second pad (210) is relatively aligned with the end of the second positioning plate (206) close to the connecting rod big end.

4. A diesel engine main and auxiliary connecting rod processing device according to claim 1, characterized in that: Anti-slip pads are provided on the bottom surfaces of the first positioning plate (204), the second positioning plate (206) and the third positioning plate (203).

5. A diesel engine main and auxiliary connecting rod processing device according to claim 2, characterized in that: The pre-tightening positioning plate (207) is rotatably connected to the top end of the pre-tightening positioning pillar (213), and the bottom end of the pre-tightening positioning pillar (213) is fixedly connected to the top surface of the precision boring base (202) (202).

6. A method for processing a main and auxiliary connecting rod of a diesel engine, using the processing device for processing a main and auxiliary connecting rod of a diesel engine according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S1: pre-processing the connecting rod; Step S2: rough machining the connecting rod; Step S3: performing fine milling on the connecting rod; Step S4: performing precision boring on the connecting rod; The precision boring process comprises: Step S4-1: placing the connecting rod small end (103) in the V-shaped groove of the second positioning block (208) of the processing device; Step S4-2: Using the small end (103) of the connecting rod to press against the V-shaped groove and rotating the large end (102) of the connecting rod until the large end (102) of the connecting rod presses against the side wall of the first positioning block (205) of the processing device; Step S4-3: operating the pre-tightening positioning plate (207) of the processing device to press the connecting rod shaft (101); Step S4-4: operating the first positioning plate (204) and the second positioning plate (206) of the processing device to press the connecting rod big end (102) to fix the connecting rod big end (102); Step S4-5: adjusting the height of the floating support block (211) of the processing device to control the posture of the connecting rod; Step S4-6: operate the third positioning plate (203) of the processing device to press the small end of the connecting rod (103) to fix the small end of the connecting rod (103).

7. A method for processing a diesel engine main and auxiliary connecting rod according to claim 6, characterized in that: In the step S4-2, after the connecting rod big end (102) abuts against the side wall of the first positioning block (205), the bottom surface of the connecting rod big end (102) can contact the first cushion block (209) and the second cushion block (210) of the processing device.

8. A method for processing a diesel engine main and auxiliary connecting rod according to claim 6, characterized in that: The pre-processing includes connecting rod end surface processing and three-hole drilling and boring processing.

9. A method for processing a diesel engine main and auxiliary connecting rod according to claim 8, characterized in that: The three holes to be bored include a connecting rod big end hole (104), a connecting rod small end hole (105) and a connecting rod ear hole (106).

10. A method for processing a main and auxiliary connecting rod of a diesel engine according to claim 6, characterized in that: The rough machining includes rough milling and rough boring.

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