Special reverse chambering machine for connecting rod and reverse chambering method for connecting rod

Abstract

The invention relates to a special reverse chambering machine for a connecting rod and a reverse chambering method for the connecting rod, and the method comprises the following steps: firstly, providing the connecting rod, and arranging bolt hole processing planes on two sides of the big end of the provided connecting rod and through holes axially processed by the bolt hole processing planes, then, a reaming section is defined on the other side, away from the bolt hole machining plane in the axial direction, of the through hole, a reaming mechanism is arranged on the side, away from the bolt hole machining plane, of the large end of the connecting rod, and the reaming mechanism is controlled to conduct reaming on the reaming section in the direction close to the bolt hole machining plane in the axial direction; the diameter of the reamed hole is larger than the initial hole diameter of the through hole. Through the specially designed reverse reaming method and equipment, a cutter on original equipment for scraping the bolt hole of the connecting rod does not need to be lengthened to completely pass through the length of the through hole or even can be shortened, the risk of cutter breakage is reduced, the service life of the equipment is further prolonged, and the production efficiency is improved. And meanwhile, the dimensional accuracy of the connecting rod hole can be controlled within a minimum tolerance range.

Description

Technical Field

[0001] The present invention relates to the technical field of connecting rod processing, and particularly relates to a special machine for reverse reaming of connecting rods and a method for reverse reaming of connecting rods. Background Art

[0002] In the manufacturing of equipment such as engines, the machining accuracy of the connecting rod bolt holes is crucial for the connection strength and reliability between the connecting rod and the bolt. High-strength bolts need to be matched with high-precision bolt holes to fully exert their high-strength performance. In the prior art, for the machining of the bolt holes on both sides of the connecting rod, a machine tool with a reverse scraping operation is required. The machining method is that first, the tool enters from the machining plane of the bolt hole of the connecting rod, and an intermediate through hole is axially machined. The through hole includes a machined screw installation section and a thread installation section. Then, after the tool completely extends out of the through hole, the end of the tool body extends out the reverse scraper, moves in the opposite direction of machining the through hole on the side far from the bolt hole machining plane and simultaneously uses the reverse scraper for cutting to obtain a reverse reamed hole. Then, the reverse scraper retracts into the tool body, and the tool gradually retracts in the direction close to the bolt hole machining plane until it completely moves out of the through hole. However, in actual use, such a method has very strict requirements for the strength and length of the tool. A tool that can completely pass through the bolt hole needs to be selected, which makes the length of the tool longer to pass through the entire workpiece. The tool life and strength after lengthening are much lower than the conventional performance, which causes defects such as tool marks and burrs on the surface of the hole. These defects will increase the resistance during bolt installation and may even cause problems such as loosening or leakage of the bolt during use; moreover, such a method needs to complete both the forward machining of the through hole and the reverse reaming of the hole, increasing the complexity and operation difficulty, easily resulting in uneven quality of the machined connecting rod holes, and reducing the overall quality stability and accuracy. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects in the prior art, and thus provide a special machine for reverse reaming of connecting rods and a method for reverse reaming of connecting rods.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for reverse reaming of a connecting rod includes the following steps:

[0006] Step S 1 , Provide a connecting rod, both sides of the large end of the connecting rod have bolt hole machining planes, and also have a through hole axially machined from the bolt hole machining planes;

[0007] Step S 2, define a reaming section on the other side of the through hole along the axial direction away from the machining plane of the bolt hole, and provide a reaming mechanism on the side of the large end of the connecting rod away from the machining plane of the bolt hole. Control the reaming mechanism to ream the reaming section along the axial direction close to the machining plane of the bolt hole, so as to form a reamed hole with a diameter larger than the initial diameter of the through hole.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A special machine for reverse reaming of connecting rods, including the reaming mechanism described above and capable of executing the method, further includes:

[0010] A base, having a connecting rod mounting position, and the connecting rod mounting position is provided with a large end positioning mechanism and a small end positioning mechanism;

[0011] The reaming mechanism is movably arranged on the base, including a reaming part and a driving part. The reaming part is located between the large end positioning mechanism and the small end positioning mechanism, and can be axially aligned with the reaming section. The reaming part is connected to the driving part, and the driving part is used to drive the reaming part to move along the axial direction close to the machining plane of the bolt hole for the reaming section, and ream the reaming section.

[0012] Further, the number of the reaming parts is two groups, located on both sides of the large end of the connecting rod, respectively corresponding to the reaming sections of the through holes on both sides of the large end of the connecting rod;

[0013] The driving part includes a rotating unit and a moving unit. The rotating unit is connected to the two groups of reaming parts, and is used to provide power for the two groups of reaming parts at the same time to drive the two groups of reaming parts to rotate at the same time. The moving unit is arranged on the base, and the moving unit is used to drive the two groups of reaming parts to move along the axial direction close to the machining plane of the bolt hole for the reaming sections on both sides of the connecting rod at the same time.

[0014] Further, the rotating unit includes a power source, a belt, a first belt pulley and two groups of second belt pulleys. The first belt pulley is arranged on the output shaft of the power source, the second belt pulley is connected to the reaming part, and the first belt pulley is connected to the second belt pulley through the belt, so that under the drive of the power source and the transmission of the belt, the second belt pulley rotates and drives the reaming part to rotate and ream the reaming section.

[0015] Further, the rotating unit further includes a transmission intermediate part, which includes a transmission shaft and a gear set. The transmission shaft is fixedly connected to the second pulley. The gear set includes at least a first gear and a second gear. The first gear is fixedly connected to the transmission shaft, and the second gear is connected to the hole expanding part. The second gear drives the hole expanding part to rotate under the drive of the first gear.

[0016] Further, the hole expanding part includes a rod and a cutter head. The rod is detachably connected to the cutter head. The rod is connected to the driving part. The cutter head has an operating state of applying force to the hole expanding section to expand the hole expanding section.

[0017] Further, a pressing device is further included, and the pressing device is fixedly connected to the base;

[0018] The number of the pressing devices is two groups, which are located on both sides of the big end of the connecting rod;

[0019] The big end of the connecting rod has an upper surface and a lower surface arranged oppositely. The two sides of the upper surface and the lower surface respectively have a first area and a second area close to the through hole. The pressing device has a pressing state of applying force to the first area to push the second area to abut against the base.

[0020] Further, the big end positioning mechanism is used to abut against the inner wall surface of the big end of the connecting rod, and the small end positioning mechanism is used to abut against the inner wall surface of the small end of the connecting rod. And there is a gap between at least a partial outer wall surface of the small end positioning mechanism and the inner wall surface of the small end of the connecting rod.

[0021] Further, a housing is further included, and the connection part between the driving part and the hole expanding part is arranged inside the housing;

[0022] The moving unit includes a slide rail and a slider. The slide rail is fixedly arranged on the base. The slider is used to move relative to the slide rail to synchronously drive the hole expanding part to move along the axial direction close to the bolt hole machining plane of the hole expanding section;

[0023] Wherein, during the process that the moving unit drives the hole expanding part to move, a gap is always reserved between the housing and the small end of the connecting rod without contact.

[0024] Further, a control part is further included, which is used to coordinately control the reverse hole expanding special machine of the connecting rod to realize automatic operation. The control part is equipped with a PLC controller, and the PLC controller is communicatively connected with the hole expanding mechanism.

[0025] In summary, compared with the prior art, the present invention at least has the following beneficial effects:

[0026] The present invention relates to a special machine for reverse reaming of connecting rods and a method for reverse reaming of connecting rods. First, a connecting rod is provided, and both sides of the large end of the provided connecting rod have bolt hole machining planes, and there is also a through hole axially machined from the bolt hole machining plane. Then, a reaming section is defined on the other side of the through hole along the axial direction away from the bolt hole machining plane, and a reaming mechanism is arranged on the side of the large end of the connecting rod away from the bolt hole machining plane. The reaming mechanism is controlled to ream the reaming section in the direction approaching the bolt hole machining plane along the axial direction, so as to form a reaming hole with a diameter larger than the initial diameter of the through hole to complete the reverse reaming process. Through the specially designed reverse reaming method and equipment, the tool on the original equipment for scraping the bolt holes of the connecting rod does not need to be lengthened to completely pass through the length of the through hole and can even be shortened, so that the tool always works at an appropriate length and strength, reducing problems such as tool breakage and excessive wear caused by abnormal tool stress, reducing the risk of its fracture, further improving the service life and service strength of the original equipment for scraping the bolt holes of the connecting rod, improving production efficiency, and at the same time reducing the operation difficulty of the original equipment for scraping the bolt holes of the connecting rod, improving the reliability and maintenance convenience in the process of forward reaming and reverse reaming, and being able to control the dimensional accuracy of the connecting rod hole within a very small tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a special machine for reverse reaming of connecting rods provided in an embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram of a special machine for reverse reaming of connecting rods provided in another embodiment of the present invention.

[0030] Figure 3 It is a top view schematic diagram of a special machine for reverse reaming of connecting rods provided in an embodiment of the present invention.

[0031] Figure 4 It is a schematic structural diagram of a connecting rod provided in an embodiment of the present invention.

[0032] Figure 5 It is a cross-sectional schematic diagram of a preliminarily processed connecting rod provided in an embodiment of the present invention.

[0033] Figure 6 It is a cross-sectional schematic diagram of a processed connecting rod provided in an embodiment of the present invention.

[0034] Figure 7 This is a schematic structural diagram of the rotating unit provided in an embodiment of the present invention.

[0035] Explanation of reference numerals:

[0036] 1. Reaming mechanism; 11. Reaming part; 111. Rod; 112. Tool bit; 12. Driving part; 121. Rotating unit; 1211. Power source; 1212. Belt; 1213. First pulley; 1214. Second pulley; 1215. Transmission shaft; 1216. First gear; 1217. Second gear;

[0037] 2. Base; 21. Big-end positioning mechanism; 22. Small-end positioning mechanism;

[0038] 3. Pressing device;

[0039] 4. Housing;

[0040] 5. Connecting rod; 51. Plane for bolt hole machining; 52. Through hole; 53. Reaming section; 54. Upper surface; 55. Lower surface; 56. First area; 57. Second area. Detailed implementation manners

[0041] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] As shown in the appended Figure 1 to the appended Figure 6 figures, a method for reverse reaming of a connecting rod includes the following steps:

[0045] Step S 1 , provide a connecting rod 5. Both sides of the large end of the connecting rod 5 have bolt hole machining planes 51, and also have a through hole 52 axially machined from the bolt hole machining planes 51;

[0046] Step S 2 , define a reaming section 53 on the other side of the through hole 52 along the axis away from the bolt hole machining plane 51, and arrange a reaming mechanism 1 specifically for reverse reaming of the connecting rod 5 on the side of the large end of the connecting rod 5 away from the bolt hole machining plane 51. Control the reaming mechanism 1 to ream the reaming section 53 along the direction approaching the bolt hole machining plane 51 axially, so as to form a reaming with a diameter larger than the initial aperture of the through hole 52.

[0047] Specifically, as shown in the appended Figure 5 and the appended Figure 6 figures, the entire bolt hole of the connecting rod 5 includes a screw rod installation section 57, a thread installation section 55, and a counter-reaming section (the same section as 53 in the figure). The traditional machining method for the bolt hole is as follows: First, the tool enters from the bolt hole machining plane 51 of the connecting rod, and a through hole 52 in an intermediate state is axially machined. This through hole 52 includes the already machined screw rod installation section 57 and thread installation section 55. Then, after the tool completely extends out of the through hole 52, the end of the tool body extends out a counter-reaming cutter, moves in the opposite direction of machining the through hole on the side away from the bolt hole machining plane 51 and simultaneously uses the counter-reaming cutter for cutting to obtain a counter-reamed hole. Then, the counter-reaming cutter retracts into the tool body, and the tool gradually retracts in the direction approaching the bolt hole machining plane 51 until it completely moves out of the through hole 52. And for the present application to machine a reaming corresponding to the counter-reamed hole, the machining method is as follows: First, obtain a connecting rod with the through hole 52 preliminarily machined, then transfer the preliminarily machined connecting rod 5 to a special machine for reverse reaming of the connecting rod, and position the connecting rod 5 so that the axis of the reaming part 11 of the reaming mechanism 1 is aligned with the axis of the through hole 52. Finally, use the reaming mechanism 1 to ream the through hole 52 on the side away from the bolt hole machining plane 51 to obtain the reverse reaming of the connecting rod 5.

[0048] Through a specially designed reverse reaming method, the equipment for scraping the connecting rod bolt holes originally can be made to not require reverse hole scraping operation, changing the traditional reaming method. It only needs to scrape along the processing direction of the through hole 52, that is, a single direction, without the need for subsequent reverse reaming operation. Therefore, the tool on the original equipment for scraping the connecting rod bolt holes does not need to be lengthened to completely pass through the length of the through hole 52 and can even be shortened, reducing the risk of tool breakage. It further improves the service life and service strength of the original equipment for scraping the connecting rod bolt holes, improves production efficiency, reduces the operation difficulty of the original equipment for scraping the connecting rod bolt holes at the same time, improves the reliability and maintenance convenience of the connecting rod during the forward reaming and reverse reaming processes, ensures the reaming accuracy. Furthermore, the two pieces of equipment can perform processing operations at different stages simultaneously, realizing partial parallelization of the processing process, shortening the overall processing time, and improving production efficiency.

[0049] In addition to the above-mentioned connecting rod reverse reaming method, the present invention also provides a special-purpose machine for connecting rod reverse reaming operating based on the above-mentioned connecting rod reverse reaming method. The special-purpose machine for connecting rod reverse reaming described below can be mutually referred to corresponding to the above-mentioned connecting rod reverse reaming method described above.

[0050] As shown in the attached Figure 1 to the attached Figure 6 figure, a special-purpose machine for connecting rod reverse reaming includes a reaming mechanism 1 used in the above-mentioned connecting rod reverse reaming method and can execute the connecting rod reverse reaming method. It further includes:

[0051] A base 2 having a connecting rod installation position. The connecting rod installation position is provided with a big-end positioning mechanism 21 and a small-end positioning mechanism 22. The connecting rod 5 with the through hole 52 preliminarily processed is installed on the connecting rod installation position for positioning to ensure that the connecting rod 5 does not displace during the processing and ensure the consistency of the reverse reaming of the connecting rod 5 during batch production. Among them, the big-end positioning mechanism 21 positions the big end of the connecting rod 5, and the small-end positioning mechanism 22 positions the small end of the connecting rod 5, making the reaming section 53 of the connecting rod 5 that needs reverse reaming face the reaming mechanism 1. The reaming mechanism 1 is movably arranged on the base 2 and can move relative to the base 2. The reaming mechanism 1 includes a reaming part 11 and a driving part 12. The reaming part 11 is located between the big-end positioning mechanism 21 and the small-end positioning mechanism 22. It should be noted that in order to avoid interference between the reaming part 11 and the small end of the connecting rod 5 during use, the processing path of the reaming part 11 needs to move within a predetermined reaming area, so that the reaming part 11 always maintains a safe interval from the small end of the connecting rod 5 during the processing and avoids mutual interference between the two in space. Furthermore, the reaming part 11 is axially aligned with the reaming section 53, and the reaming part 11 is connected to the driving part 12. The driving part 12 is used to provide the power to drive the reaming part 11, so that the reaming part 11 moves along the axial direction towards the bolt hole processing plane 51 and reams the reaming section 53.

[0052] Specifically, the method of using the connecting rod reverse reaming machine is as follows: first, place the connecting rod 5 to be processed on the connecting rod mounting position of the base 2, and fix the connecting rod 5 by the large head end positioning mechanism 21 and the small head end positioning mechanism 22. Then, control the driving unit 12 to start and provide power for the reaming unit 11. Driven by the driving unit 12, the reaming unit 11 gradually moves axially toward the direction close to the bolt hole processing plane 51 and contacts the reaming section 53 of the connecting rod, and then cuts the reaming section 53 by rotating itself. As the reaming unit 11 moves, the reaming operation is gradually completed according to the predetermined reaming size and precision requirements. When the reaming unit 11 completes the processing of the reaming section 53, the driving unit 12 stops driving, and the reaming operation ends. By setting up a special reverse hole expansion device, the original equipment for scraping the connecting rod bolt hole does not need to perform the reverse hole expansion operation, and only needs to scrape along the processing direction of the through hole 52, that is, a single direction, without the need for subsequent reverse hole expansion operations. Therefore, the tool on the original equipment for scraping the connecting rod bolt hole does not need to be lengthened to a length that completely passes through the through hole 52, and can even be shortened, so that the tool works at an appropriate length and force, reducing problems such as tool breakage and excessive wear caused by abnormal force on the tool, reducing the risk of tool breakage, further improving the service life and use intensity of the original equipment for scraping the connecting rod bolt hole, and improving production efficiency. At the same time, the operating difficulty of the original equipment for scraping the connecting rod bolt hole is reduced, and the reliability of the connecting rod 5 in the process of forward hole expansion and reverse hole expansion is improved, and the dimensional accuracy of the connecting rod hole can be controlled within an extremely small tolerance range. Furthermore, when the reverse hole expansion processing of the connecting rod involves special processes, such as requiring a specific feed angle, layered scraping sequence, etc., it is difficult for ordinary original equipment for scraping the connecting rod bolt hole to achieve these complex processes. The reverse hole scraping machine provided by the present invention can be designed and configured in a targeted manner according to these special process requirements. Furthermore, the two devices can simultaneously perform processing operations of the connecting rod 5 at different stages, thereby realizing partial parallelization of the processing process, shortening the overall processing time, and improving production efficiency.

[0053] In certain embodiments of the present invention, as shown in the attached Figure 1 To Attachment Figure 6As shown, since bolt holes need to be machined on both sides of the big end of the connecting rod 5 in the existing structure, the number of reaming parts 11 is two groups, located on both sides of the big end of the connecting rod 5, corresponding to the reaming sections 53 of the through holes 52 on both sides of the big end of the connecting rod 5 respectively; the driving part 12 includes a rotating unit 121 and a moving unit (not marked in the figure), and the rotating unit 121 is connected to the two groups of reaming parts 11, and is used to provide power for the two groups of reaming parts 11 at the same time to drive the two groups of reaming parts 11 to rotate simultaneously, ensuring that the rotation speed, rotation direction, etc. of the two groups of reaming parts 11 are completely synchronized. The moving unit is arranged on the base 2, and the moving unit is used to drive the two groups of reaming parts 11 to move along the axial direction towards the bolt hole machining plane 51 of the two sides of the connecting rod 5 at the same time, and control the feed amount and moving speed of the two groups of reaming parts 11 to be consistent, ensuring that the depths and dimensional accuracies of the two reaming sections 53 on both sides are consistent, and avoiding the situation of excessive or insufficient reaming on one side. By controlling the two groups of reaming parts 11 with one driving part 12, the reaming sections 53 of the two through holes 52 on both sides can be machined at the same time, ensuring that the sizes, shapes and relative positions with other parts of the reaming obtained on both sides are consistent, and greatly improving the overall quality and performance of the connecting rod 5.

[0054] In some embodiments of the present invention, as shown in the appendix Figure 7 As shown, the rotating unit 121 includes a power source 1211, a belt 1212, a first belt pulley 1213 and two groups of second belt pulleys 1214. The first belt pulley 1213 is arranged on the output shaft of the power source 1211, the second belt pulley 1214 is connected to the reaming part 11, and the first belt pulley 1213 is connected to the second belt pulley 1214 through the belt 1212. Through the combination of the belt 1212, the first belt pulley 1213 and the two groups of second belt pulleys 1214, the power of the power source 1211 is transmitted to the reaming part 11, so that the reaming part 11 rotates and reams the reaming section 53. Among them, the power source 1211 can be a motor, an internal combustion engine, a hydraulic motor, a pneumatic motor, etc. that meet the processing requirements. Those skilled in the art can select and adjust according to the actual application situation, product requirements and quality requirements, and are not limited here. Preferably, the power source 1211 is a four-pole motor with 1440 revolutions.

[0055] In some embodiments of the present invention, as shown in the appendix Figure 7As shown, the rotating unit 121 further includes a transmission intermediate part for accurately transmitting the power of the second pulley 1214 to the reaming part 11. The transmission intermediate part includes a transmission shaft 1215 and a gear set. The transmission shaft 1215 is fixedly connected to the second pulley 1214. The gear set at least includes a first gear 1216 and a second gear 1217. The first gear 1216 is fixedly connected to the transmission shaft 1215, and the second gear 1217 is connected to the reaming part 11. During the operation of the driving part 12, the second pulley 1214 drives the transmission shaft 1215 to rotate synchronously. The transmission shaft 1215 transmits the power to the first gear 1216. The first gear 1216 meshes with the second gear 1217 or additional gears are provided between the two to mesh with each other, and the power is transmitted from the first gear 1216 to the second gear 1217. The reaming part 11 rotates driven by the second gear 1217. By using the characteristics of gear transmission, the torque transmitted by the second pulley 1214 can be reasonably amplified or reduced, so that the reaming part 11 can obtain an appropriate torque during operation, improving the reaming efficiency and quality and avoiding reaming problems caused by insufficient or excessive torque. Among them, since the transmission ratio of the first gear 1216 and the second gear 1217 depends on the tooth number ratio of the two, different tooth numbers of the first gear 1216 and the second gear 1217 can be designed according to needs to achieve speed change and torque adjustment, and thus adapt to different reaming process requirements. The specific tooth number ratio of the first gear 1216 and the second gear 1217 can be selected and adjusted according to the actual application situation, product requirements and quality requirements, and is not limited herein.

[0056] In some embodiments of the present invention, as shown in the attached Figure 3 As shown, the reaming part 11 includes a rod 111 and a cutter head 112. The rod 111 is detachably connected to the cutter head 112, and the cutter head 112 can be replaced according to the processing requirements, improving the versatility of the connecting rod reverse reaming special machine, and facilitating the maintenance of the cutter head 112. The rod 111 is connected to the driving part 12. The cutter head 112 has an operating state of applying force to the reaming section 53 to ream the reaming section 53. Among them, the rod 111 is cylindrical. One end of the cutter head 112 is arranged at the axial center position of the rod 111, ensuring the central symmetry of the cutter head 112 during rotation and reducing unstable factors caused by eccentricity. The other end extends outward beyond the outer periphery of the rod 111. A gap is formed between the outer periphery of the rod 111 and the inner wall of the reaming section 53 during the cutting process, which is beneficial to the discharge of chips, avoiding the accumulation of chips during the reaming process and thus affecting the cutting effect and the service life of the cutter head 112. Preferably, the cutter head 112 is diamond-shaped, because the acute angle part of the diamond-shaped cutter head 112 can concentrate the cutting force and reduce the cutting resistance, making the reaming process smoother.

[0057] In some embodiments of the present invention, as shown in the attached Figure 1 to the attached Figure 6As shown, in order to keep the position of the connecting rod 5 fixed during reverse reaming and ensure its stability during the reverse reaming process, the special reverse reaming machine for the connecting rod further includes a pressing device 3, and the pressing device 3 is fixedly connected to the base 2. The number of the pressing devices 3 is two groups, which are located on both sides of the large end of the connecting rod 5. The large end of the connecting rod 5 has an upper surface 54 and a lower surface 55 arranged oppositely, and both sides of the upper surface 54 and the lower surface 55 respectively have a first area 56 and a second area 57 close to the through hole 52. When the pressing device 3 is started, it switches to the pressing state, applies force to the first area 56 through the pressing device 3, and pushes the second area 57 against the base 2, preventing the connecting rod 5 from loosening and displacing due to factors such as vibration and force during reverse reaming, and ensuring the stability and reliability during the reverse reaming process. Preferably, the pressing device 3 adopts a hydraulic pressing method.

[0058] In some embodiments of the present invention, as shown in the appendix Figure 3 As shown, the large end positioning mechanism 21 is used to abut against the inner wall surface of the large end of the connecting rod 5, and the small end positioning mechanism 22 is used to abut against the inner wall surface of the small end of the connecting rod 5, respectively positioning both ends of the connecting rod 5 to ensure that the connecting rod 5 does not move randomly during the working process. Due to the inconsistency of the dimensions of the connecting rods 5 in actual production, there is a tolerance between the connecting rods 5. When the dimension of the connecting rod 5 exceeds the matching range of the large end positioning mechanism 21 and the small end positioning mechanism 22, forced installation will cause the connecting rod 5 or the small end positioning mechanism 22 to be subjected to an additional extrusion force, resulting in deformation or even damage. Therefore, there is a gap between at least a partial outer wall surface of the small end positioning mechanism 22 and the inner wall surface of the small end of the connecting rod 5, ensuring that the large end positioning mechanism 21, the small end positioning mechanism 22 and the connecting rod 5 can still cooperate normally in the presence of tolerance, and improving the compatibility of the special reverse reaming machine for the connecting rod. Preferably, the large end positioning mechanism 21 is a round pin, and the small end positioning mechanism 22 is a diamond pin.

[0059] In some embodiments of the present invention, as shown in the appendix Figure 1 As shown, it further includes a housing 4, and the connecting part of the driving part 12 and the reaming part 11 is arranged inside the housing 4; the moving unit includes a slide rail and a slider. The slide rail is fixedly arranged on the base 2 and plays a guiding role. The set direction thereof is the same as the axial direction of the through hole 52. The slider is movably arranged on the slide rail and is used to move relative to the slide rail, and the slider is connected to the reaming mechanism 1 or the housing 4. When the slider moves relative to the slide rail, it can synchronously drive the reaming mechanism 1 to move, and then synchronously drive the reaming part 11 to move the reaming section 53 along the axial direction close to the bolt hole machining plane 51. It should be noted that during the process of the moving unit driving the reaming part 11 to move, there is always a gap between the housing 4 and the small end of the connecting rod 5 without contact, avoiding interference with the small end of the connecting rod 5, thereby preventing the position deviation or vibration of the reaming part 11 caused by interference, and ensuring that the reaming part 11 can perform reverse reaming on the reaming section 53 according to the predetermined trajectory and accuracy.

[0060] In some embodiments of the present invention, a control unit is further included, which is used to coordinate and control the reverse reaming special machine for connecting rods to achieve automated operation. A PLC controller is installed in the control unit, and the PLC controller is communicatively connected to the reaming mechanism 1. By processing according to a preset unified standard and procedure, the processing quality of the reverse reaming of each connecting rod 5 can be kept highly consistent. For example, the roughness of the hole wall, the tolerance range of the hole diameter, etc. are all within the specified indexes, effectively ensuring the quality stability of the reverse reaming of the connecting rod 5. At the same time, the automated processing process reduces the dependence on skilled workers, and one person can operate the special machine, reducing the labor cost.

[0061] The above embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A connecting rod reverse hole expansion method, characterized in that: The following steps are involved: Step S1, providing a connecting rod, wherein both sides of the big end of the connecting rod have bolt hole processing planes and also have through holes axially processed by the bolt hole processing planes; Step S2, defining a reaming section on the other side of the through hole axially away from the bolt hole processing plane, and setting a reaming mechanism on the side of the big end of the connecting rod away from the bolt hole processing plane, controlling the reaming mechanism to reame the reaming section in a direction axially close to the bolt hole processing plane to form an reamed hole with a diameter larger than the initial hole diameter of the through hole.

2. A connecting rod reverse hole expansion machine, characterized in that: The device comprises the hole expanding mechanism of claim 1 and is capable of executing the method of claim 1, further comprising: The base has a connecting rod installation position, and the connecting rod installation position is provided with a large head end positioning mechanism and a small head end positioning mechanism; The reaming mechanism is movably arranged on the base, and includes a reaming portion and a driving portion. The reaming portion is located between the large head end positioning mechanism and the small head end positioning mechanism, and can be axially aligned with the reaming section. The reaming portion is connected to the driving portion, and the driving portion is used to drive the reaming portion to move the reaming section in an axial direction close to the bolt hole processing plane, and to reame the reaming section.

3. The connecting rod reverse hole expansion machine as claimed in claim 2, characterized in that: The number of the reaming parts is two groups, which are located on both sides of the big end of the connecting rod and correspond to the reaming sections of the through holes on both sides of the big end of the connecting rod respectively; The driving part includes a rotating unit and a moving unit. The rotating unit is connected to the two groups of the reaming parts and is used to provide power to the two groups of the reaming parts at the same time to drive the two groups of the reaming parts to rotate at the same time. The moving unit is arranged on the base, and is used to simultaneously drive the two groups of the reaming parts to move the reaming sections on both sides of the connecting rod along the axial direction close to the bolt hole processing plane.

4. The connecting rod reverse hole expansion machine as claimed in claim 3, characterized in that: The rotating unit includes a power source, a belt, a first pulley and two sets of second pulleys, the first pulley is arranged on the output shaft of the power source, the second pulley is connected to the reaming part, and the first pulley and the second pulley are connected through the belt, so that under the drive of the power source and the transmission of the belt, the second pulley rotates and drives the reaming part to rotate and reaming the reaming section.

5. The connecting rod reverse hole expansion machine as claimed in claim 4, characterized in that: The rotating unit also includes a transmission transfer part, which includes a transmission shaft and a gear set. The transmission shaft is fixedly connected to the second pulley. The gear set includes at least a first gear and a second gear. The first gear is fixedly connected to the transmission shaft, and the second gear is connected to the reaming part. The second gear drives the reaming part to rotate under the transmission of the first gear.

6. The connecting rod reverse hole expansion machine as claimed in claim 2, characterized in that: The reaming portion includes a rod and a cutter head, wherein the rod is detachably connected to the cutter head, the rod is connected to the driving portion, and the cutter head has an operating state of applying force to the reaming section to reame the hole of the reaming section.

7. The connecting rod reverse hole expansion machine as claimed in claim 2, characterized in that: It also includes a clamping device, which is fixedly connected to the base; The number of the clamping devices is two, which are located on both sides of the big end of the connecting rod; The big end of the connecting rod has an upper surface and a lower surface that are arranged opposite to each other, and the upper surface and the lower surface have a first area and a second area close to the through hole on both sides respectively, and the clamping device has a function of applying force to the first area to push the second area against the base to form a clamping state.

8. The connecting rod reverse hole expansion machine as claimed in claim 2, characterized in that: The big head end positioning mechanism is used to abut against the inner wall surface of the big head end of the connecting rod, and the small head end positioning mechanism is used to abut against the inner wall surface of the small head end of the connecting rod, and there is a gap between at least a partial outer wall surface of the small head end positioning mechanism and the inner wall surface of the small head end of the connecting rod.

9. The connecting rod reverse hole expansion machine as claimed in claim 3, characterized in that: It also includes a shell, in which the connecting portion between the driving portion and the hole expanding portion is arranged; The moving unit comprises a slide rail and a slider, wherein the slide rail is fixedly arranged on the base, and the slider is used to move relative to the slide rail to synchronously drive the reaming part to move the reaming section in an axial direction close to the bolt hole processing plane; Wherein, when the moving unit drives the reaming portion to move, a gap is always reserved between the shell and the small end of the connecting rod without any contact.

10. The connecting rod reverse hole expansion machine as claimed in claim 2, characterized in that: It also includes a control unit for coordinating and controlling the connecting rod reverse reaming machine to achieve automatic operation. The control unit is equipped with a PLC controller, and the PLC controller is communicatively connected with the reaming mechanism.

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