Stepped shaft shoulder tapping apparatus

Abstract

The application discloses a stepped shaft shoulder punching equipment, which comprises two top plates and a side plate. A fixed cross and a movable cross are arranged between the two top plates. The fixed cross is fixedly connected with the side plate. The movable cross is located between the fixed cross and the shoulder surface of the stepped shaft to be machined and is movably connected with the side plate. A pressing device is installed between the fixed cross and the movable cross. The pressing device is used for driving the movable cross to axially move along the side plate and gradually approach the shoulder surface. An axially extending drill bit is installed on the plate surface of the movable cross towards the shoulder surface. The top end of the drill bit is hingedly connected with the movable cross. The end of the drill bit is tightly pressed against the shoulder surface. A driving device is installed on the fixed cross. The driving device drives the drill bit to rotate through a transmission device. The driving device and the drill bit are radially staggered, so that the drill bit can approach the central shaft and interference between the driving device and the central shaft is avoided. The drill bit can directly drill on the shoulder surface, work efficiency is improved, and machining precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tooling equipment, in particular to a stepped shaft shoulder drilling equipment. BACKGROUND

[0002] In mechanical manufacturing, there are cases that need to drill holes on the shoulder of the stepped shaft. The stepped shaft includes a center shaft and a joint part arranged axially, the end of the center shaft is connected to the top end of the joint part, the diameter of the joint part is larger than that of the center shaft, and a hole is arranged at the end of the joint part. The hole is a tapered hole that is retracted. When drilling holes on the shoulder to connect the tapered hole, drilling cannot be performed in the tapered hole, that is, drilling cannot be performed from the end to the top end, so drilling can only be performed from the top end to the end of the shoulder.

[0003] When the drilling position is close to the center shaft, the width of the drilling equipment will interfere with the center shaft, and the drill bit cannot be aligned with the drilling position. Deep hole drilling technology must be used to drill holes on the blank first, and then the center shaft is machined on the blank. For workpieces with long center shafts, the drilling depth of the deep hole drill is limited. The manufacturing process is complex, so drilling holes on the shoulder of the long center shaft has problems such as long processing cycle, high cost, and difficult to guarantee processing accuracy compared with conventional deep hole drilling.

[0004] Therefore, how to provide a stepped shaft shoulder drilling equipment for drilling near the center shaft is a technical problem that needs to be solved by those skilled in the art at present. SUMMARY

[0005] The purpose of the present application is to provide a stepped shaft shoulder drilling equipment. A special spline drill bit is used to change the shaft rotation to side gear drive drill bit rotation, so that the drill bit can be close to the center shaft, avoid interference between the driving device and the center shaft, and directly drill holes on the shoulder surface, improve work efficiency, and improve processing accuracy.

[0006] In order to solve the above technical problems, the present application provides a stepped shaft shoulder punching device, which comprises two top plates arranged oppositely and a side plate connecting the two top plates, the two top plates clamp the axial two ends of a stepped shaft to be processed, a fixed cross and a movable cross are arranged between the two top plates, the fixed cross is fixedly connected with the side plate, the movable cross is located between the fixed cross and the shoulder surface of the stepped shaft to be processed and is movably connected with the side plate, a pressing device is installed between the fixed cross and the movable cross, the pressing device is used to drive the movable cross to move axially along the side plate and gradually approach the shoulder surface, an axially extending drill bit is installed on the plate surface of the movable cross facing the shoulder surface, the upper end of the drill bit is hinged to the movable cross, and the tail end of the drill bit abuts against the shoulder surface, a driving device is installed on the fixed cross, the driving device drives the drill bit to rotate through a transmission device, and the driving device is arranged away from the drill bit.

[0007] Preferably, two side plates are arranged side by side, the side plates are provided with axially extending sliding grooves, the fixed cross is provided with radially extending upper side arms on both sides, the upper side arms of the fixed cross are inserted into and fixed in the corresponding sliding grooves, the movable cross is provided with radially extending lower side arms on both sides, the lower side arms of the movable cross are inserted into and move along the sliding grooves, and two pressing devices are symmetrically installed on both sides of the central shaft and between the upper side arms of the fixed cross and the lower side arms of the movable cross.

[0008] Preferably, the middle part of the fixed cross is provided with an upper through hole, the middle part of the movable cross is provided with a lower through hole, and the central shaft part of the stepped shaft passes through the lower through hole and the upper through hole in sequence.

[0009] Preferably, the front side of the fixed cross is provided with a radially extending upper front arm, the driving device is installed on the upper front arm, the front side of the movable cross is provided with a radially extending lower front arm, the lower front arm is provided with a front through hole, a front mounting hole facing the shoulder surface is arranged behind the front through hole, the top end of the drill bit is inserted into the front mounting hole, the transmission device passes through the front through hole, the top end of the transmission device is connected with the driving device, and the tail end of the transmission device is connected with the top end of the drill bit.

[0010] Preferably, the pressing device is a vertically arranged hydraulic cylinder, the driving device is an electric motor, the transmission device comprises a spline shaft and a gear sleeved on the spline shaft, the drill bit is provided with external teeth engaged with the gear, the movable cross is capable of pushing the gear to move towards the shoulder surface in the axial direction, the spline shaft is provided at the end with a base, the spline shaft is sleeved with a spring, and the two ends of the spring are respectively abutted against the base and the gear.

[0011] Preferably, the rear side of the fixed cross is provided with a radially extending upper rear arm, and the rear side of the movable plate is provided with a radially extending lower rear arm.

[0012] Preferably, two groups of the driving device, the transmission device and the drill bit arranged symmetrically are respectively installed on the upper front arm of the fixed cross and the lower front arm of the movable cross.

[0013] Preferably, the pressing device is installed between the upper side arm of the fixed cross and the lower side arm of the movable cross.

[0014] Preferably, the positioning disc is further sleeved on the central shaft, the positioning disc is pressed against the shoulder surface, the positioning disc is provided with a positioning hole, and the end of the drill bit passes through the positioning hole.

[0015] Preferably, a plurality of radially extending positioning screws are installed on the outer periphery of the positioning disc, and the positioning screws are tightly pressed against the outer periphery of the central shaft.

[0016] The present application provides a stepped shaft shoulder drilling device, which comprises two top plates arranged oppositely and a side plate connecting the two top plates, the two top plates clamp the axial ends of a stepped shaft to be machined, and a fixed cross and a movable cross are arranged between the two top plates, the fixed cross is fixedly connected with the side plate, the movable cross is located between the fixed cross and the shoulder surface of the stepped shaft to be machined, and the movable cross is movably connected with the side plate, a pressing device is installed between the fixed cross and the movable cross, the pressing device is used to drive the movable cross to move along the side plate in the axial direction and gradually approach the shoulder surface, an axially extending drill bit is installed on the plate surface of the movable cross towards the shoulder surface, the upper end of the drill bit is hinged to the movable cross, and the end of the drill bit is tightly pressed against the shoulder surface, a driving device is installed on the fixed cross, the driving device drives the drill bit to rotate through a transmission device, and the driving device is arranged away from the drill bit.

[0017] During the machining process, the stepped shaft to be machined is placed between the two top plates, the end of the drill bit is clamped to the shoulder surface through the movable plate, the driving device drives the drill bit to rotate through the transmission device, and the movable plate and the drill bit are pushed to move axially through the pressing device, the drill bit is gradually fed to the shoulder surface, and the drilling operation is completed. The driving device and the drill bit are radially staggered, so that the drill bit can be close to the central shaft, the driving device and the central shaft are prevented from interfering, the drilling can be directly performed on the shoulder surface, the working efficiency is improved, and the machining precision is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structural schematic view of one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0019] Figure 2 A side schematic view of one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0020] Figure 3 A structural schematic view of the stepped shaft to be machined in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0021] Figure 4 A structural schematic view of the top plate in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0022] Figure 5 A structural schematic view of the side plate in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0023] Figure 6 A structural schematic view of the fixed cross in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0024] Figure 7 A structural schematic view of the movable cross in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0025] Figure 8 A structural schematic view of the motor in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application;

[0026] Figure 9 A structural schematic view of the drill bit in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application.

[0027] Figure 10 A structural schematic view of the positioning disc in one specific embodiment of the stepped shaft shoulder punching equipment provided by the present application.

[0028] Wherein, the top plate 1, the top mounting hole 11, the side plate 2, the sliding groove 21, the top mounting column 22, the stepped shaft 3, the center shaft 31, the joint part 32, the shoulder surface 33, the fixed cross 4, the upper side arm 41, the upper through hole 42, the upper front arm 43, the upper rear arm 44, the movable cross 5, the lower side arm 51, the lower through hole 52, the lower front arm 53, the lower rear arm 54, the pressure device 6, the drill bit 7, the driving device 8, the transmission device 9, the spline shaft 91, the gear 92, the base 93, the spring 94, the positioning disc 10, the positioning hole 101. DETAILED DESCRIPTION

[0029] The core of the present application is to provide a stepped shaft shoulder drilling equipment, special spline drill bit, change shaft rotation to side gear driving drill bit rotation, so that the drill bit can be close to the center shaft, avoid the interference between the driving device and the center shaft, can be directly drilled on the shoulder surface, improve the work efficiency, improve the machining precision.

[0030] In order to make the personnel in the technical field better understand the present application scheme, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0031] Please refer to Figures 1 to 5 , Figure 1 The structure diagram of one specific embodiment of the stepped shaft shoulder drilling equipment provided by the present application is shown in the figure. Figure 2 The side view diagram of one specific embodiment of the stepped shaft shoulder drilling equipment provided by the present application is shown in the figure. Figure 3 The structure diagram of the stepped shaft to be processed in one specific embodiment of the stepped shaft shoulder drilling equipment provided by the present application is shown in the figure. Figure 4 The structure diagram of the top plate in one specific embodiment of the stepped shaft shoulder drilling equipment provided by the present application is shown in the figure. Figure 5 The structure diagram of the side plate in one specific embodiment of the stepped shaft shoulder drilling equipment provided by the present application is shown in the figure.

[0032] The embodiment of the present application provides a stepped shaft shoulder punching equipment, which comprises two top plates 1 and a side plate 2, the two top plates 1 are oppositely arranged, the side plate 2 is arranged between the two top plates 1, and the axis of the side plate 2 is connected to the two top plates 1 at both ends, so that the two top plates 1 clamp the axial ends of a stepped shaft 3 to be machined. Specifically, two side plates 2 can be arranged side by side and connected to the two sides of the top plate 1 respectively to form a rectangular frame structure, and the stepped shaft 3 to be machined is placed in the rectangular frame. The extension direction of the stepped shaft 3 to be machined is the axial direction, and the direction perpendicular to the axial direction is the radial direction. The stepped shaft 3 to be machined comprises a center shaft 31 and a joint part 32, and the stepped shaft 3 extends from the top end to the end. The end of the center shaft 31 is connected to the top end of the joint part 32, the diameter of the joint part 32 is greater than that of the center shaft 31, and a tapered hole is arranged at the end of the joint part 32. A hole needs to be drilled on the shoulder to communicate with the tapered hole. The top end of the center shaft 31 is in contact with one top plate 1, and the end of the joint part 32 is in contact with the other top plate 1.

[0033] Preferably, top mounting holes 11 are arranged on the two sides of the top plate 1, and top mounting columns 22 are arranged at the two ends of the side plate 2. During installation, the top mounting columns 22 are inserted into the top mounting holes 11, and are bolted to the end faces of the top mounting columns 22. The outer side faces of the top plates 1 are pressed by the bolts. The diameter of the nut of the bolt is greater than that of the top mounting column 22, so that the nut presses the outer side faces of the top plates 1, and the top plates 1 and the side plate 2 are connected to form a frame structure. Of course, other connection methods can also be used, such as arranging external threads on the outer periphery of the top mounting column 22. After passing through the top mounting hole 11, the top mounting column 22 is connected by a nut to press the top plate 1. The length of the top mounting column 22 can also be adjusted to further adjust the length of the frame, so as to be applicable to stepped shafts 3 of different lengths.

[0034] A fixed cross 4 and a movable cross 5 are arranged between the two top plates 1, and the fixed cross 4 and the movable cross 5 do not interfere with the center shaft 31. The fixed cross 4 is fixedly connected to the side plate 2, and the movable cross 5 is located between the fixed cross 4 and the shoulder surface 33 of the stepped shaft 3 to be machined and movably connected to the side plate 2. A pressing device 6 is arranged between the fixed cross 4 and the movable cross 5. The pressing device 6 is used to drive the movable cross 5 to move along the axial direction of the side plate 2 and gradually approach the shoulder surface 33. An axially extending drill bit 7 is arranged on the plate surface of the movable cross 5 facing the shoulder surface 33. The top end of the drill bit 7 is hinged to the movable cross 5, and the end of the drill bit 7 abuts against the shoulder surface 33. A driving device 8 is arranged on the fixed cross 4. The driving device 8 drives the drill bit 7 to rotate through a transmission device 9. The driving device 8 and the drill bit 7 are arranged in a staggered manner.

[0035] During the machining process, the stepped shaft to be machined 3 is placed between the two top plates 1, the end of the drill bit 7 is clamped against the shoulder surface 33 by the movable cross 5, the driving device 8 drives the drill bit 7 to rotate through the transmission device 9, and the movable cross 5 and the drill bit 7 are pushed to move axially by the pressing device 6, gradually feeding towards the shoulder surface 33, and the drilling operation is completed. The driving device 8 and the drill bit 7 are radially staggered, that is, the width of the driving device 8 does not affect the installation position of the drill bit 7, so that the drill bit 7 can be close to the central shaft 31, avoiding interference between the driving device 8 and the central shaft 31, and the drilling can be directly performed on the shoulder surface 33, improving the working efficiency and the machining precision.

[0036] Please refer to Figures 6 to 10 , Figure 6 The structure diagram of the fixed cross in one specific embodiment of the stepped shaft shoulder hole drilling equipment provided by the present application is shown in the figure. Figure 7 The structure diagram of the movable cross in one specific embodiment of the stepped shaft shoulder hole drilling equipment provided by the present application is shown in the figure. Figure 8 The structure diagram of the motor in one specific embodiment of the stepped shaft shoulder hole drilling equipment provided by the present application is shown in the figure. Figure 9 The structure diagram of the drill bit in one specific embodiment of the stepped shaft shoulder hole drilling equipment provided by the present application is shown in the figure. Figure 10 The structure diagram of the positioning disc in one specific embodiment of the stepped shaft shoulder hole drilling equipment provided by the present application is shown in the figure.

[0037] In the stepped shaft shoulder hole drilling equipment provided in the specific embodiment of the present application, the side plate 2 is provided with an axially extending sliding groove 21, the fixed cross 4 is provided with an upper side arm 41 extending radially to both sides on both sides, the end of the upper side arm 41 is inserted into the corresponding sliding groove 21 and fixed by a bolt, the bolt is installed on the end face of the upper side arm 41, the diameter of the nut of the bolt is greater than the thickness of the upper side arm 41, so that the nut presses the outer side surface of the side plate 2 to fix the fixed cross 4 at a fixed position of the side plate 2, and the bolt can also be loosened to adjust the position of the fixed cross 4. At the same time, the movable cross 5 is provided with a lower side arm 51 extending radially to both sides on both sides, the upper side arm 41 and the lower side arm 51 on the same side are opposite, the end of the lower side arm 51 is inserted into the corresponding sliding groove 21 and moves along the sliding groove 21, and the two pressing devices 6 are symmetrically installed on both sides of the central shaft 31 and between the upper side arm 41 and the lower side arm 51. The two pressing devices 6 work synchronously to push the movable cross 5 to move axially during drilling. Since the two pressing devices 6 are symmetrically arranged, the problem of unbalanced load is avoided. Other guiding methods can also be used, such as the side plate 2 being an axially extending guide column, and guide holes being provided at the ends of the upper side arm 41 and the lower side arm 51, and the guide column passing through the guide holes to guide the axial movement of the movable cross 5.

[0038] In order to avoid the interference between the fixed cross 4 and the movable cross 5 and the center shaft 31, the middle part of the fixed cross 4 is provided with an upper through hole 42, the middle part of the movable cross 5 is provided with a lower through hole 52, and the center shaft 31 of the stepped shaft 3 passes through the lower through hole 52 and the upper through hole 42 in sequence. The fixed cross 4 and the movable cross 5 are sleeved on the center shaft 31 and can move axially.

[0039] Wherein, the front side of the fixed cross 4 is provided with a radially extending upper front arm 43, the driving device 8 is installed on the plate surface of the upper front arm 43 facing the shoulder surface 33, the front side of the movable cross 5 is provided with a radially extending lower front arm 53, the upper front arm 43 is opposite to the lower front arm 53, the lower front arm 53 is provided with a front through hole, the rear side of the front through hole is provided with a front mounting hole facing the shoulder surface 33, the front mounting hole is a blind hole, that is, the front mounting hole is closer to the center shaft 31 than the front through hole, the distance between the front mounting hole and the center shaft 31 is the distance between the drilling position and the center shaft 31, the drill bit 7 is a rod, the end of the drill bit 7 is provided with a cutting edge, the top end of the drill bit 7 is inserted into the front mounting hole, so that the top end of the drill bit 7 is hinged with the front mounting hole, that is, the drill bit 7 can rotate freely around the axis to complete the drilling work. In order to reduce the friction resistance, a ball can be installed in the front mounting hole, the top end of the drill bit 7 contacts with the ball, the ball is a hard material ball with the same diameter as the drill bit 7, which avoids the direct contact between the top end of the drill bit 7 and the bottom of the front mounting hole, and reduces the torque. Of course, a bearing or other components can also be installed in the front mounting hole.

[0040] Further, the transmission device 9 passes through the front through hole, the top end of the transmission device 9 is connected with the driving device 8, and the end of the transmission device 9 is connected with the top end of the drill bit 7. Specifically, the pressing device 6 is a vertically arranged hydraulic cylinder, the driving device 8 is an electric motor, the transmission device 9 includes a spline shaft 91 and a gear 92 sleeved on the spline shaft 91, the outer periphery of the rod of the drill bit 7 is provided with external teeth meshing with the gear 92, and the gear 92 is located between the shoulder surface 33 and the movable cross 5. In order to limit the movement of the gear 92, the end of the spline shaft 91 is provided with a base 93, the top of the base 93 is provided with a threaded rod which is directly screwed into the threaded hole at the end of the spline shaft 91, the spline shaft 91 is externally sleeved with a spring 94, and the two ends of the spring 94 are respectively abutted with the base 93 and the gear 92. Through the action of the spring 94, the gear 92 is pushed to abut against the plate surface of the lower front arm 53. During the drilling process, the pressing device 6 pushes the movable cross 5 to move axially, and further pushes the gear 92 to move axially relative to the spline shaft 91, but continuously meshes with the external teeth of the rod of the drill bit 7. The gear 92 is internally provided with a spline groove matched with the spline shaft 91. The electric motor drives the spline shaft 91 to rotate, and drives the drill bit 7 to rotate through the gear 92. If the drilling position is far away from the center shaft 31, the top end of the drill bit 7 can be made into a cylindrical shape larger than the rod of the drill bit 7. If the drilling position is close to the center shaft 31, the rod of the drill bit 7 is made into a gear shape. Other types of driving devices 8 can also be used, which are all within the protection scope of the present application.

[0041] On the basis of the stepped shaft shoulder punching device provided in the above embodiments, the positioning disc 10 is sleeved on the central shaft 31. The positioning disc 10 is also provided with a through hole at the center, the central shaft 31 passes through the through hole at the center, the diameter of the through hole matches the diameter of the central shaft 31, the positioning disc 10 is stably placed, radial limiting is realized, the positioning disc 10 is not easily shaken after installation, the positioning disc 10 is pressed against the shoulder surface 33, the axial positioning hole 101 is arranged on the positioning disc 10 corresponding to the position where the hole is needed to be drilled, in the working process, the end of the drill bit 7 passes through the positioning hole 101 and contacts the shoulder surface 33 to complete the drilling, and the positioning of the drilling position is realized through the positioning hole 101. In order to fix the positioning disc 10, a plurality of positioning screws penetrating in the radial direction are arranged on the outer periphery of the positioning disc 10, and the positioning screws are pressed against the outer periphery of the central shaft 31.

[0042] The assembly process of the device is as follows: the motor is fixed on the upper front arm 43 of the fixed cross 4, the spline shaft 91 connected with the motor passes through the front through hole of the lower front arm 53 of the movable cross 5, and the two ends of the hydraulic cylinder are fixed between the upper side arm 41 and the lower side arm 51. The gear with a spline groove 92 is sleeved on the spline shaft 91, then the spring 94 is sleeved on the spline shaft 91, and the base 93 is connected. The positioning disc 10 passes through the central shaft 31 and is placed on the shoulder surface 33, and is fixed and installed by tightening the bolt. The upper side arm 41 and the lower side arm 51 of the fixed cross 4 and the movable cross 5 are inserted into the sliding groove 21 of the side plate 2 and temporarily fixed, the central shaft 31 passes through the lower through hole 52 and the upper through hole 42 in sequence, the top plate 1 and the side plate 2 are installed, the two top plates 1 press the top end of the central shaft 31 and the end of the joint part 32, the position of the positioning hole 101 is corrected, and finally the locking and fixing are completed through the nut. The antifriction ball and the drill bit 7 are sequentially installed in the front mounting hole, the temporary fixing of the fixed cross 4 and the movable cross 5 is loosened and moved downward, and after the drill bit 7 enters the positioning hole 101 of the positioning disc 10 and contacts the shoulder surface 33, the installation is completed.

[0043] In the working process, the motor is started, the spline shaft 91 drives the gear 92 to rotate, the drill bit 7 also rotates, the hydraulic cylinder is adjusted in extension and retraction through the hydraulic control device to pressurize the movable cross 5, the movable cross 5 transmits the pressure to the drill bit 7, and the drilling is completed with the increase of the feed amount of the drill bit 7. If the drill bit 7 needs to be replaced, the motor rotation can be stopped, the hydraulic cylinder is retracted, the drill bit 7 is taken out and replaced.

[0044] In another specific embodiment, the rear side of the fixed cross 4 is provided with radially extending upper rear arms 44, and the rear side of the movable cross 5 is provided with radially extending lower rear arms 54, i.e. the fixed cross 4 and the movable cross 5 are cross-shaped plate structures. If symmetrical punching is required on the shoulder surface 33, two sets of driving devices 8, transmission devices 9 and drill bits 7 are provided, respectively installed on the lower front arms 53 and the lower rear arms 54, and the two sets of devices punch simultaneously, with better stability. Further, when a single hole is punched, if the hole diameter is large, in order to avoid the problem of eccentric load, a pressing device 6 is installed between the upper rear arms 44 and the lower rear arms 54, providing symmetrical pressure.

[0045] The stepped shaft shoulder punching device provided by the present application is described in detail above. The principles and embodiments of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A stepped shaft shoulder drilling device, characterized in that, The assembly includes two opposing top plates (1) and a side plate (2) connecting the two top plates (1). The two top plates (1) clamp the axial ends of the stepped shaft (3) to be processed. A fixed cross (4) and a movable cross (5) are provided between the two top plates (1). The fixed cross (4) is fixedly connected to the side plate (2). The movable cross (5) is located between the fixed cross (4) and the shoulder surface (33) of the stepped shaft (3) to be processed, and the movable cross (5) is movably connected to the side plate (2). A pressure device is installed between the fixed cross (4) and the movable cross (5). The pressurizing device (6) is used to drive the movable cross (5) to move axially along the side plate (2) and gradually approach the shoulder surface (33). An axially extending drill bit (7) is installed on the plate surface of the movable cross (5) facing the shoulder surface (33). The upper end of the drill bit (7) is hinged to the movable cross (5), and the end of the drill bit (7) is pressed against the shoulder surface (33). A driving device (8) is installed on the fixed cross (4). The driving device (8) drives the drill bit (7) to rotate through the transmission device (9). The driving device (8) and the drill bit (7) are arranged separately. The system includes two side plates (2) arranged side by side, each side plate (2) having an axially extending groove (21). The fixed cross (4) has radially extending upper side arms (41) on both sides. The upper side arms (41) of the fixed cross are inserted into the corresponding grooves (21) and fixed. The movable cross (5) has radially extending lower side arms (51) on both sides. The lower side arms (51) of the movable cross (5) are inserted into the corresponding grooves (21) and move along the grooves (21). Two pressurizing devices (6) are symmetrically installed on both sides of the central axis (31) of the stepped shaft (3) to be processed, and are installed between the upper side arms (41) of the fixed cross (4) and the lower side arms (51) of the movable cross (5). The top plate (1) has top mounting holes (11) on both sides, and the side plate (2) has top mounting posts (22) at both ends. During installation, the top mounting posts (22) are inserted into the top mounting holes (11), and bolts are installed on the end face of the top mounting posts (22). The bolts press the outer side of the top plate (1) together. The diameter of the bolt nut is larger than the diameter of the top mounting post (22), so that the nut presses the outer side of the top plate (1) together, and the top plate (1) and the side plate (2) are connected to form a frame structure.

2. The stepped shaft shoulder drilling device according to claim 1, characterized in that, The fixed cross (4) has an upper through hole (42) in the middle, and the movable cross (5) has a lower through hole (52) in the middle. The central shaft (31) of the stepped shaft (3) to be processed passes through the lower through hole (52) and the upper through hole (42) in sequence.

3. The stepped shaft shoulder drilling device according to claim 2, characterized in that, The fixed cross (4) has a radially extending upper forearm (43) on its front side, and the drive device (8) is mounted on the upper forearm (43). The movable cross (5) has a radially extending lower forearm (53) on its front side, and a front through hole is provided on the lower forearm (53). A front mounting hole facing the shoulder surface (33) is provided behind the front through hole. The top end of the drill bit (7) is inserted into the front mounting hole. The transmission device (9) passes through the front through hole. The top end of the transmission device (9) is connected to the drive device (8), and the end end of the transmission device (9) is connected to the top end of the drill bit (7).

4. The stepped shaft shoulder drilling device according to claim 3, characterized in that, The pressurizing device (6) is specifically a vertically arranged hydraulic cylinder, the driving device (8) is specifically a motor, the transmission device (9) includes a spline shaft (91) and a gear (92) fitted on the spline shaft (91), the drill bit (7) has external teeth on its outer periphery that mesh with the gear (92), the movable cross (5) can push the gear (92) axially toward the shoulder surface (33), the spline shaft (91) is fitted with a base (93) at its end, the spline shaft (91) is fitted with a spring (94), and the two ends of the spring (94) abut against the base (93) and the gear (92) respectively.

5. The stepped shaft shoulder drilling device according to claim 4, characterized in that, The fixed cross (4) has a radially extending upper rear arm (44) on its rear side, and the movable cross (5) has a radially extending lower rear arm (54) on its rear side.

6. The stepped shaft shoulder drilling device according to claim 5, characterized in that, Two sets of drive devices (8), transmission devices (9) and drill bits (7) arranged symmetrically are respectively installed on the upper forearm (43) of the fixed cross (4) and the lower forearm (53) of the movable cross (5).

7. The stepped shaft shoulder drilling device according to claim 5, characterized in that, The pressurizing device (6) is installed between the upper arm (41) of the fixed cross (4) and the lower arm (51) of the movable cross (5).

8. The stepped shaft shoulder drilling device according to any one of claims 1 to 7, characterized in that, It also includes a positioning plate (10) fitted onto the central shaft (31), the positioning plate (10) pressing against the shoulder surface (33), the positioning plate (10) having a positioning hole (101), the end of the drill bit (7) passing through the positioning hole (101).

9. The stepped shaft shoulder drilling device according to claim 8, characterized in that, The positioning disk (10) is equipped with a plurality of radially extending positioning screws on its outer periphery, the positioning screws being pressed against the outer periphery of the central shaft (31).

Images