Special reverse chambering machine for connecting rod

Abstract

The utility model relates to a special reverse chambering machine for a connecting rod, which is used for performing reverse chambering on the connecting rod, bolt hole processing planes are arranged on two sides of a big end of the connecting rod, a through hole is axially processed by the bolt hole processing planes, a chambering section is defined on the other side of the through hole, which is far away from the bolt hole processing planes along the axial direction, and the special reverse chambering machine comprises a base, a large-head end positioning mechanism and a small-head end positioning mechanism are arranged; the broaching mechanism is movably arranged on the base and comprises a broaching part and a driving part, the broaching part is located between the large-head end positioning mechanism and the small-head end positioning mechanism and is aligned with the broaching section in the axial direction, the broaching part is connected with the driving part, and the driving part is used for driving the broaching part to move the broaching section in the direction close to the bolt hole machining plane in the axial direction. And the chambering section is chambered. Through specially designed reverse reaming equipment, the risk of cutter breakage can be reduced, and meanwhile, the dimensional accuracy of the connecting rod hole can be controlled within a minimum tolerance range.

Description

TECHNICAL FIELD

[0001] The utility model relates to connecting rod processing technical field, especially a connecting rod reverse hole expanding special machine. BACKGROUND

[0002] In the manufacture of engine and other equipment, the machining precision of connecting rod bolt hole is crucial to the connection strength and reliability of connecting rod and bolt, and high-strength bolt needs to cooperate with high-precision bolt hole to fully exert its high-strength performance. In the prior art, for the machining of bolt holes on both sides of the connecting rod, a machine tool with reverse scraping operation is needed, and the machining mode is that the cutter is first made to enter from the bolt hole machining plane of the connecting rod, an intermediate state through hole is obtained by axial machining, the through hole includes a machined bolt mounting section and a threaded mounting section, then after the cutter completely extends out of the through hole, the tail end of the cutter body extends out of the reverse scraper, moves in the opposite direction of machining the through hole on the side away from the bolt hole machining plane and simultaneously uses the reverse scraper to cut, to obtain a reverse scraping hole, then the reverse scraper is retracted into the cutter body, and the cutter gradually retreats to the direction close to the bolt hole machining plane until it is completely removed from the through hole. However, this kind of method has very strict requirements on the strength and length of the cutter in actual use, and a cutter capable of completely passing through the bolt hole needs to be selected, which lengthens the length of the cutter to pass through the entire workpiece, and the lengthened cutter has a life and strength far lower than the conventional performance, which causes the cutter to leave marks, burrs and other defects on the surface of the hole, and these defects increase the resistance during bolt installation, and even may cause the bolt to loosen or leak during use. Moreover, this kind of method needs to complete both the forward machining of the through hole and the machining of the reverse scraping hole, which increases the complexity and operation difficulty, and easily causes the quality of the machined connecting rod hole to be uneven, thereby reducing the overall quality stability and precision. SUMMARY

[0003] The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a connecting rod reverse hole expanding special machine.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A connecting rod reverse hole expanding special machine is used for reverse hole expansion of a connecting rod, wherein both sides of the big end of the connecting rod have a bolt hole machining plane, and a through hole is axially machined from the bolt hole machining plane, and a hole expanding section is defined on the other side of the through hole axially away from the bolt hole machining plane;It comprises:

[0006] A base has a connecting rod mounting position, the connecting rod mounting position is provided with a big end positioning mechanism and a small end positioning mechanism;

[0007] The reaming mechanism is movably arranged on the base, comprising a reaming part and a driving part, the reaming part is arranged between the large end positioning mechanism and the small end positioning mechanism and can be arranged in axial alignment with the reaming section, the reaming part is connected with the driving part, and the driving part is used to drive the reaming part to move the reaming section in the direction of axial alignment with the bolt hole machining plane and ream the reaming section.

[0008] Further, the number of reaming parts is two groups, which are located on both sides of the large end of the connecting rod and correspond to the reaming sections of the through holes on both sides of the large end of the connecting rod respectively.

[0009] The driving part comprises a rotating unit and a moving unit, the rotating unit is connected with the two groups of reaming parts and is used to simultaneously provide power for the two groups of reaming parts to simultaneously drive the two groups of reaming parts to rotate, and the moving unit is arranged on the base and is used to simultaneously drive the two groups of reaming parts to move the reaming sections on both sides of the connecting rod in the direction of axial alignment with the bolt hole machining plane.

[0010] Further, the rotating unit comprises 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 with the reaming part, and the first belt pulley and the second belt pulley are connected through the belt, so that the second belt pulley rotates and drives the reaming part to rotate and ream the reaming section under the driving of the power source and the transmission of the belt.

[0011] Further, the rotating unit further comprises a transmission intermediate part, the transmission intermediate part comprises a transmission shaft and a gear set, the transmission shaft is fixedly connected with the second belt pulley, the gear set at least comprises a first gear and a second gear, the first gear is fixedly connected with the transmission shaft, and the second gear is connected with the reaming part, so that the second gear drives the reaming part to rotate under the transmission of the first gear.

[0012] Further, the reaming part comprises a rod and a tool bit, the rod is detachably connected with the tool bit, the rod is connected with the driving part, and the tool bit has a rotating state of applying force to the reaming section to ream the reaming section.

[0013] Further, the pressure device is fixedly connected with the base.

[0014] The number of pressure devices is two groups, which are located on both sides of the large end of the connecting rod.

[0015] The big end of the connecting rod has oppositely arranged upper and lower surfaces, and the two sides of the upper and lower surfaces have first and second regions close to the through hole, and the pressing device has a pressing state of pressing the first region to push the second region against the base.

[0016] Further, the big end positioning mechanism is used for abutting against the inner wall surface of the big end of the connecting rod, the small end positioning mechanism is used for abutting against the inner wall surface of the small end of the connecting rod, and the small end positioning mechanism has a gap between the at least partially outer wall surface and the inner wall surface of the small end of the connecting rod.

[0017] Further, the driving part and the connecting part of the hole expanding part are arranged in the housing.

[0018] The moving unit comprises a sliding rail and a sliding block, the sliding rail is fixedly arranged on the base, and the sliding block is used for moving relative to the sliding rail to synchronously drive the hole expanding part to move the hole expanding section along the axial direction close to the bolt hole machining plane.

[0019] In the process that the moving unit drives the hole expanding part to move, the housing and the small end of the connecting rod are always reserved with a gap and do not contact.

[0020] Further, the control part is used for coordinating and controlling the connecting rod reverse hole expanding special machine to realize automatic operation, the control part is installed with a PLC controller, and the PLC controller is in communication connection with the hole expanding mechanism.

[0021] Compared with the prior art, the utility model has at least the following beneficial effects:

[0022] The utility model relates to a connecting rod reverse counterboring special machine for carrying out reverse counterboring to connecting rod, wherein the two sides of the big end of the connecting rod have bolt hole processing planes, further have through holes processed by the bolt hole processing planes in the axial direction, and the counterboring section is defined on the other side of the through hole away from the bolt hole processing plane in the axial direction, comprising: a base provided with a big end positioning mechanism and a small end positioning mechanism; a counterboring mechanism movably arranged on the base, the counterboring mechanism comprising a counterboring part and a driving part, the counterboring part is located between the big end positioning mechanism and the small end positioning mechanism, and is arranged in alignment with the counterboring section in the axial direction, the counterboring part is connected with the driving part, the driving part is used for driving the counterboring part to move in the direction of the axial direction close to the bolt hole processing plane and counterboring the counterboring section to form the counterbore with the diameter larger than the initial hole diameter of the through hole. Through the specially designed reverse counterboring equipment, the cutter on the original scraping connecting rod bolt hole equipment does not need to be lengthened to the length of the through hole or even can be shortened, the cutter always works at the appropriate length and strength, the problems of cutter breakage and excessive wear caused by abnormal stress are reduced, the risk of breakage is reduced, the service life and use strength of the original scraping connecting rod bolt hole equipment are further improved, the production efficiency is improved, the operation difficulty of the original scraping connecting rod bolt hole equipment is reduced, the reliability and maintenance convenience in the process of forward counterboring and reverse counterboring are improved, and the size precision of the connecting rod hole can be controlled within a very small tolerance range. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0024] Figure 1 The structure diagram of the connecting rod reverse counterboring special machine provided in one embodiment of the utility model.

[0025] Figure 2 The structure diagram of the connecting rod reverse counterboring special machine provided in another embodiment of the utility model.

[0026] Figure 3 The top view schematic diagram of the connecting rod reverse counterboring special machine provided in one embodiment of the utility model.

[0027] Figure 4 The structure diagram of the connecting rod provided in one embodiment of the utility model.

[0028] Figure 5 The cross-sectional schematic diagram of the initially processed connecting rod provided in one embodiment of the utility model.

[0029] Figure 6 A cross section schematic view of the finished connecting rod is provided in an embodiment of the utility model.

[0030] Figure 7 A structure schematic view of the rotating unit is provided in an embodiment of the utility model.

[0031] Explanation of reference signs:

[0032] 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,

[0033] 2, base, 21, large end positioning mechanism, 22, small end positioning mechanism,

[0034] 3, pressing device,

[0035] 4, shell,

[0036] 5, connecting rod, 51, bolt hole processing plane, 52, through hole, 53, reaming section, 54, upper surface, 55, lower surface, 56, first area, 57, second area. DETAILED DESCRIPTION

[0037] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0038] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation to the utility model. In addition, the terms "first", "second", "third" are only for the description purpose, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0040] As shown in the accompanying Figure 1 To the accompanying Figure 6 As shown in the accompanying drawings, a connecting rod reverse counterboring special machine is used for reverse counterboring of a connecting rod 5, wherein the connecting rod 5 has bolt hole machining planes 51 on both sides of the large end, further has through holes 52 machined axially from the bolt hole machining planes 51, and defines a counterboring section 53 on the other side of the through hole 52 axially away from the bolt hole machining planes 51; the connecting rod reverse counterboring special machine comprises a base 2 having a connecting rod mounting position, the connecting rod mounting position is provided with a large end positioning mechanism 21 and a small end positioning mechanism 22, the connecting rod 5 with the through hole 52 preliminarily machined is mounted on the connecting rod mounting position for positioning, so as to ensure that the connecting rod 5 does not displace in the machining process and ensure the consistency of the reverse counterboring of the connecting rod 5 in batch production. Wherein the large end positioning mechanism 21 positions the large end of the connecting rod 5, and the small end positioning mechanism 22 positions the small end of the connecting rod 5, so that the counterboring section 53 of the connecting rod 5 needing reverse counterboring is opposite to a counterboring mechanism 1; the counterboring mechanism 1 is movably arranged on the base 2 and can move relatively to the base 2, the counterboring mechanism 1 comprises a counterboring part 11 and a driving part 12, the counterboring part 11 is located between the large end positioning mechanism 21 and the small end positioning mechanism 22, and it is worth noting that, in order to avoid interference between the counterboring part 11 and the small end of the connecting rod 5 in the use process, the machining path of the counterboring part 11 needs to move within the predetermined counterboring area, so that the counterboring part 11 always maintains a safe interval with the small end of the connecting rod 5 in the machining process, and interference between the two in space is avoided. Further, the counterboring part 11 is arranged axially in alignment with the counterboring section 53, and the counterboring part 11 is connected with the driving part 12, and the driving part 12 is used for providing driving power for the counterboring part 11, so as to move the counterboring part 11 in the axial direction close to the bolt hole machining plane 51, and counterbore the counterboring section 53 to form a counterbore with a diameter larger than the initial hole diameter of the through hole.

[0041] Specifically, the accompanying Figure 5 And the accompanying Figure 6As shown, the entire bolt hole of the connecting rod 5 includes a screw rod mounting section 57, a threaded mounting section 55 and an anti-scraping hole section (same section as 53 in the figure). The conventional processing method for the bolt hole is as follows: first, the tool enters from the bolt hole processing plane 51 of the connecting rod, and axially processes to obtain an intermediate state through hole 52, which includes the processed screw rod mounting section 57 and threaded mounting section 55, then after the tool completely extends out of the through hole 52, the end of the tool body extends outwards to an anti-scraping tool, moves in the opposite direction of processing the through hole on the side away from the bolt hole processing plane 51 and simultaneously uses the anti-scraping tool to cut to obtain an anti-scraping hole, then the anti-scraping tool is retracted into the tool body, and the tool gradually retreats towards the bolt hole processing plane 51 until it is completely removed from the through hole 52. In order to process the counterbore corresponding to the anti-scraping hole, the processing method is as follows: first, the connecting rod with the preliminarily processed through hole 52 is obtained, then the preliminarily processed connecting rod 5 is transferred to the connecting rod counterbore special machine, and the connecting rod 5 is positioned to align the axis of the counterbore mechanism 1 with the axis of the through hole 52, and finally the counterbore mechanism 1 is used to counterbore the through hole 52 on the side away from the bolt hole processing plane 51 to obtain the counterbore of the connecting rod 5.

[0042] The use method of the connecting rod counterbore special machine in the application is as follows: first, the connecting rod 5 to be processed is placed on the connecting rod mounting position of the base 2, and the connecting rod 5 is fixed by the big end positioning mechanism 21 and the small end positioning mechanism 22. Then the driving part 12 is controlled to start to provide power for the counterbore part 11, and the counterbore part 11 is gradually moved axially towards the bolt hole processing plane 51 under the driving of the driving part 12 and contacts the counterbore section 53 of the connecting rod, then the counterbore section 53 is cut by the rotation of the counterbore part 11, and the counterboring operation is gradually completed according to the predetermined counterbore size and accuracy requirement as the counterbore part 11 moves. When the counterbore part 11 completes the processing of the counterbore section 53, the driving part 12 stops driving, and the counterboring operation is completed.

[0043] By setting a special reverse reaming device, the original scraping connecting rod bolt hole device does not need to perform reverse scraping operation, and only needs to perform scraping in the machining direction of the through hole 52, that is, in a single direction, without the need for subsequent reverse reaming operation. Therefore, the tool on the original scraping connecting rod bolt hole device does not need to be lengthened to the length of completely passing through the through hole 52, and can even be shortened, so that the tool works at a suitable length and strength, reduces the problems of tool breakage and excessive wear caused by abnormal stress, reduces the risk of tool breakage, further improves the service life and use strength of the original scraping connecting rod bolt hole device, improves the production efficiency, reduces the operation difficulty of the original scraping connecting rod bolt hole device, improves the reliability of the connecting rod 5 in the processes of forward reaming and reverse reaming, and controls the size precision of the connecting rod hole within a very small tolerance range. Furthermore, when the reverse scraping machining of the connecting rod involves special processes, such as a specific feed angle and a layered scraping sequence, the ordinary original scraping connecting rod bolt hole device is difficult to implement these complex processes, and the reverse scraping special machine provided by the utility model can be designed and configured according to these special process requirements.

[0044] In some embodiments of the utility model, as shown in the accompanying drawings, Figure 1 to the accompanying drawings, Figure 6 As shown in the accompanying drawings, because the existing structure of the connecting rod 5 needs to machine bolt holes on both sides of the large end, the number of the reaming parts 11 is two groups, which are located on both sides of the large end of the connecting rod 5 and correspond to the reaming sections 53 of the through holes 52 on both sides of the large 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), the rotating unit 121 is connected with the two groups of reaming parts 11 and is used for simultaneously providing power for the two groups of reaming parts 11 to drive the two groups of reaming parts 11 to rotate simultaneously, so as to ensure that the rotation speed and rotation direction of the two groups of reaming parts 11 are completely synchronous. The moving unit is arranged on the base 2, and the moving unit is used for simultaneously driving the two groups of reaming parts 11 to move along the axial direction towards the bolt hole machining plane 51 on both sides of the connecting rod 5, and the feed amount and moving speed of the two groups of reaming parts 11 are controlled to be consistent, so as to ensure that the depths and size precision of the reaming sections 53 on both sides are consistent, and the conditions of excessive or insufficient reaming on one side are avoided. By simultaneously controlling the two groups of reaming parts 11 through one group of driving parts 12, the reaming sections 53 of the through holes 52 on both sides can be machined simultaneously, so as to ensure that the size, shape and relative position with other parts of the reaming on both sides are consistent, and the overall quality and performance of the connecting rod 5 are greatly improved.

[0045] In some embodiments of the utility model, as shown in the accompanying drawings, Figure 7As shown, the rotating unit 121 comprises a power source 1211, a belt 1212, a first belt pulley 1213 and two sets of second belt pulleys 1214, the first belt pulley 1213 is arranged on the output shaft of the power source 1211, the second belt pulleys 1214 are connected with the hole expanding part 11, and the first belt pulley 1213 and the second belt pulleys 1214 are connected through the belt 1212. Through the combination of the belt 1212, the first belt pulley 1213 and the two sets of second belt pulleys 1214, the power of the power source 1211 is transmitted to the hole expanding part 11, so that the hole expanding part 11 rotates and expands the hole expanding section 53. Wherein, the power source 1211 can be a motor, an internal combustion engine, a hydraulic motor and a pneumatic motor which meet the processing requirements, and the person skilled in the art can select and adjust according to the actual application, product requirements and quality requirements, which are not limited here. Preferably, the power source 1211 is a four-pole motor of 1440 revolutions.

[0046] In some embodiments of the present application, as shown in the accompanying Figure 7 As shown, the rotating unit 121 further comprises a transmission intermediate part for accurately transmitting the power of the second belt pulley 1214 to the hole expanding part 11. The transmission intermediate part comprises a transmission shaft 1215 and a gear set, the transmission shaft 1215 is fixedly connected with the second belt pulley 1214, and the gear set at least comprises a first gear 1216 and a second gear 1217, the first gear 1216 is fixedly connected with the transmission shaft 1215, and the second gear 1217 is connected with the hole expanding part 11. In the running process of the driving part 12, the second belt pulley 1214 drives the transmission shaft 1215 to rotate synchronously, the transmission shaft 1215 transmits power to the first gear 1216, the first gear 1216 and the second gear 1217 are meshed with each other or gears are additionally arranged between the two gears to mesh with each other, the power is transmitted from the first gear 1216 to the second gear 1217, and the hole expanding part 11 rotates under the driving of the second gear 1217. By utilizing the characteristics of gear transmission, the torque transmitted by the second belt pulley 1214 can be reasonably enlarged or reduced, so that the hole expanding part 11 obtains appropriate torque during work, the hole expanding efficiency and quality are improved, and the hole expanding problems caused by insufficient or excessive torque are avoided. Wherein, since the transmission ratio of the first gear 1216 and the second gear 1217 depends on the tooth ratio of the two gears, the first gear 1216 and the second gear 1217 with different tooth numbers can be designed according to the needs to realize speed change and torque adjustment, thereby adapting to different hole expanding process requirements. The specific tooth ratio of the first gear 1216 and the second gear 1217 can be selected and adjusted according to the actual application, product requirements and quality requirements, which are not limited here.

[0047] In some embodiments of the present application, as shown in the accompanying Figure 3As shown, the counterbore part 11 includes a rod 111 and a tool head 112, the rod 111 is detachably connected with the tool head 112, the tool head 112 can be replaced according to the processing requirement, the versatility of the connecting rod counterbore special machine is improved, and the tool head 112 is convenient to maintain. The rod 111 is connected with the driving part 12, the tool head 112 has a working state of applying force to the counterbore section 53 to counterbore the counterbore section 53. Wherein, the rod 111 is cylindrical, one end of the tool head 112 is arranged at the axial position of the rod 111, the central symmetry of the tool head 112 in rotation is ensured, and the unstable factors caused by eccentricity are reduced, 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 counterbore section 53 in the cutting process, the discharge of the cutting chip is facilitated, the cutting chip is prevented from accumulating in the counterbore process, and then the cutting effect and the service life of the tool head 112 are affected. Preferably, the tool head 112 is rhombic, because the acute angle part of the rhombic tool head 112 can concentrate the cutting force and reduce the cutting resistance, so that the counterboring process is more smooth.

[0048] In some embodiments of the present application, as shown in the accompanying drawings Figure 1 to the accompanying Figure 6 As shown, in order to keep the position of the connecting rod 5 fixed during the reverse counterboring, and ensure the stability during the reverse counterboring, the connecting rod reverse counterboring special machine further comprises a pressing device 3, and the pressing device 3 is fixedly connected with the base 2. The number of the pressing device 3 is two groups, and the two groups are located on the two sides of the large end of the connecting rod 5. The large end of the connecting rod 5 has oppositely arranged upper and lower surfaces 54 and 55, and the two sides of the upper and lower surfaces 54 and 55 have first and second regions 56 and 57 close to the through hole 52. When the pressing device 3 is started and switched to the pressing state, the first region 56 is applied with force by the pressing device 3, the second region 57 is pushed against the base 2, the loosening and displacement of the connecting rod 5 caused by vibration, stress and other factors during the reverse counterboring are prevented, and the stability and reliability during the reverse counterboring are ensured. Preferably, the pressing device 3 adopts a hydraulic pressing mode.

[0049] In some embodiments of the present application, as shown in the accompanying drawings Figure 3As shown, the big end positioning mechanism 21 is used to abut against the inner wall surface of the big 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, so as to position the two ends of the connecting rod 5 respectively, and ensure that the connecting rod 5 does not move randomly in the working process. Due to the inconsistency of the size of the connecting rod 5 in actual production, there is a tolerance between the connecting rod 5 and the connecting rod 5, and when the size of the connecting rod 5 exceeds the adaptive range of the big end positioning mechanism 21 and the small end positioning mechanism 22, forcibly installing will cause the connecting rod 5 or the small end positioning mechanism 22 to be subjected to additional extrusion force, resulting in deformation or even damage. Therefore, there is a gap between the at least partially outer wall surface of the small end positioning mechanism 22 and the inner wall surface of the small end of the connecting rod 5, so as to ensure that the big end positioning mechanism 21, the small end positioning mechanism 22 and the connecting rod 5 can still work normally in the case of tolerance, and improve the compatibility of the connecting rod reverse hole expanding special machine. Preferably, the big end positioning mechanism 21 is a round pin, and the small end positioning mechanism 22 is a rhombic pin.

[0050] In some embodiments of the utility model, as shown in the accompanying drawings, Figure 1 As shown, the connecting part of the driving part 12 and the hole expanding part 11 is arranged in the shell 4; the moving unit comprises a sliding rail and a sliding block, the sliding rail is fixedly arranged on the base 2 and plays a guiding role, the sliding direction of the sliding rail is the same as the axial direction of the through hole 52, the sliding block is movably arranged on the sliding rail and is used for moving relative to the sliding rail, and the sliding block is connected with the hole expanding mechanism 1 or the shell 4. When the sliding block moves relative to the sliding rail, the hole expanding mechanism 1 can be driven to move synchronously, and the hole expanding part 11 can be driven to move synchronously along the axial direction of the hole expanding section 53 to the direction of the bolt hole machining plane 51. It is worth noting that during the movement of the moving unit and the hole expanding part 11, the shell 4 and the small end of the connecting rod 5 are always kept apart and do not contact, so that interference with the small end of the connecting rod 5 is avoided, thereby preventing the hole expanding part 11 from being deviated or vibrated due to interference, and ensuring that the hole expanding part 11 can perform reverse hole expansion on the hole expanding section 53 according to the predetermined track and accuracy.

[0051] In some embodiments of the utility model, a control part is further arranged, which is used for coordinating and controlling the connecting rod reverse hole expanding special machine to realize automatic operation, the control part is provided with a PLC controller, and the PLC controller is in communication connection with the hole expanding mechanism 1. By machining according to the preset unified standard and program, the machining quality of the reverse hole expansion of each connecting rod 5 can be kept highly consistent, for example, the roughness of the hole wall and the tolerance range of the hole diameter are all within the specified index, so that the quality stability of the reverse hole expansion of the connecting rod 5 is effectively ensured, and at the same time, the automatic machining process reduces the dependence on skilled workers, one person can operate the special machine, and the labor cost is reduced.

[0052] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A machine for counterboring a connecting rod, characterized in that, The application relates to a reverse counterboring machine for a connecting rod, wherein the connecting rod has bolt hole machining planes on both sides of a large end, and through holes are axially machined from the bolt hole machining planes, and a counterboring section is defined on the other side of the through hole axially away from the bolt hole machining plane. Comprise: A base has a connecting rod mounting position provided with a large end positioning mechanism and a small end positioning mechanism; A counterboring mechanism is movably arranged on the base, and the counterboring mechanism comprises a counterboring part and a driving part. The counterboring part is arranged between the large end positioning mechanism and the small end positioning mechanism and is arranged in axial alignment with the counterboring section. The counterboring part is connected with the driving part. The driving part is used for driving the counterboring part to move in the direction of approaching the bolt hole machining plane along the axial direction of the counterboring section, and counterboring the counterboring section to form a counterbore with a diameter larger than the initial hole diameter of the through hole.

2. The connecting rod counterboring special machine of claim 1 wherein, The number of the counterboring parts is two groups, which are arranged on both sides of the large end of the connecting rod and correspond to the counterboring sections of the through holes on both sides of the large end of the connecting rod respectively. The driving part comprises a rotating unit and a moving unit. The rotating unit is connected with the two groups of counterboring parts and is used for simultaneously providing power for the two groups of counterboring parts to simultaneously drive the two groups of counterboring parts to rotate. The moving unit is arranged on the base. The moving unit is used for simultaneously driving the two groups of counterboring parts to move in the direction of approaching the bolt hole machining plane along the axial direction of the counterboring section on both sides of the connecting rod.

3. The connecting rod counterboring special machine of claim 2 wherein, The rotating unit comprises 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 with the counterboring part. The first belt pulley and the second belt pulley are connected through the belt. Under the driving of the power source and the transmission of the belt, the second belt pulley rotates and drives the counterboring part to rotate and counterbore the counterboring section.

4. The connecting rod counterboring special machine of claim 3 wherein, The rotating unit further comprises a transmission intermediate transfer part. The transmission intermediate transfer part comprises a transmission shaft and a gear set. The transmission shaft is fixedly connected with the second belt pulley. The gear set comprises at least a first gear and a second gear. The first gear is fixedly connected with the transmission shaft. The second gear is connected with the counterboring part. The second gear drives the counterboring part to rotate under the transmission of the first gear.

5. The connecting rod counterboring special machine of claim 1 wherein, The counterboring part comprises a rod and a tool head. The rod is detachably connected with the tool head. The rod is connected with the driving part. The tool head has a rotating state for applying force to the counterboring section to counterbore the counterboring section.

6. The connecting rod counterboring special machine of claim 1 wherein, Further comprising a pressing device, the pressing device is fixedly connected with the base; The number of the pressing devices is two groups, which are arranged on both sides of the large end of the connecting rod; The large end of the connecting rod has oppositely arranged upper and lower surfaces. The upper and lower surfaces have first and second regions close to the through hole on both sides respectively. The pressing device has a pressing state for applying force to the first region to push the second region to abut against the base.

7. The connecting rod reverse counterboring machine of claim 1, wherein The big end positioning mechanism is used for abutting against the inner wall surface of the big end of the connecting rod, the small end positioning mechanism is used for abutting against the inner wall surface of the small end of the connecting rod, and a gap is formed between the outer wall surface of the small end positioning mechanism and the inner wall surface of the small end of the connecting rod.

8. The connecting rod counterboring special machine of claim 2 wherein, The driving part and the connecting part of the hole expanding part are arranged in the shell; The moving unit comprises a sliding rail and a sliding block, the sliding rail is fixedly arranged on the base, and the sliding block is used for moving relative to the sliding rail to synchronously drive the hole expanding part to move the hole expanding section along the axial direction to the direction of the bolt hole machining plane; In the process that the moving unit drives the hole expanding part to move, a gap is always reserved between the shell and the small end of the connecting rod, and no contact occurs.

9. The connecting rod counterboring special machine of claim 1 wherein, The control part is further arranged for coordinating and controlling the connecting rod reverse hole expanding special machine to realize automatic operation, the control part is provided with a PLC controller, and the PLC controller is in communication connection with the hole expanding mechanism.

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