Efficient crankshaft numerical control external milling machine tool

Abstract

The utility model discloses an efficient crankshaft numerical control external milling machine tool, which relates to the field of machining equipment and comprises a machine tool body, at least two tool rest boxes are movably arranged on the upper portion of the machine tool body, the tool rest boxes are arranged on a sliding plate, the sliding plate is connected with a sliding saddle through an X-axis feeding system, and the sliding saddle is connected with a lathe through a Z-axis feeding system. The left spindle box is fixedly arranged on the lower portion of the lathe bed, the right spindle box corresponds to the left spindle box and is arranged on the lathe bed in a sliding mode, and the left spindle box and the right spindle box are used for being connected with the end of a crankshaft; the left center frame and the right center frame are arranged between the left spindle box and the right spindle box, the left center frame is fixed to the lathe bed, the right center frame is arranged on the lathe bed in a sliding mode, and the left center frame and the right center frame are used for clamping the middle of the crankshaft; the machining machine tool can achieve efficient and accurate machining of crankshafts, and the production requirements of crankshafts of different varieties and specifications are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of machining equipment, more particularly, relate to a kind of high-efficiency crankshaft numerical control external milling machine tool. BACKGROUND

[0002] The existing crankshaft machining equipment has many deficiencies in machining precision, efficiency and adaptability. For example, some traditional machine tools need to frequently change clamps when machining crankshafts of different lengths, resulting in low processing efficiency. At the same time, it is difficult for traditional machine tools to achieve high precision and high efficiency in the machining process. Therefore, it is particularly important to develop a numerical control external milling machine tool that can adapt to the machining of crankshafts of different lengths and has high precision and high efficiency. SUMMARY

[0003] The utility model aims at the deficiencies of prior art, provides a kind of high-efficiency crankshaft numerical control external milling machine tool, the machining machine tool can realize the efficient, accurate machining of crankshaft, meet the production demand of different varieties, specifications crankshaft.

[0004] To achieve the above object, the utility model provides a kind of high-efficiency crankshaft numerical control external milling machine tool, including:

[0005] bed body, at least two tool holder boxes are movably arranged on the upper part, the tool holder box is arranged on the sliding plate, the sliding plate is connected with slide saddle by X-axis feeding system, and the slide saddle is connected with the bed body by Z-axis feeding system;

[0006] left spindle box is fixedly arranged on the lower part of the bed body, right spindle box is arranged on the bed body in sliding mode and corresponds to the left spindle box, and the left spindle box and the right spindle box are used to connect with the end of crankshaft;

[0007] left center bracket and right center bracket are arranged between the left spindle box and the right spindle box, the left center bracket is fixed on the bed body, the right center bracket is arranged on the bed body in sliding mode, and the left center bracket and the right center bracket are used to clamp the middle part of the crankshaft.

[0008] Optionally, the tool holder box includes:

[0009] tool holder box, tool holder stator and tool holder rotor are arranged inside, the tool holder rotor is sleeved on the first rotating shaft;

[0010] second rotating shaft is sleeved with second gear, and the second gear is engaged with the first gear on the first rotating shaft;

[0011] third rotating shaft is engaged with the second rotating shaft for transmission, and the end of the third rotating shaft is connected with the tool holder box outside the tool holder box.

[0012] Optionally, the outer periphery of the first rotating shaft is sequentially sleeved with a first bearing, a second bearing and a third bearing, the axial two sides of the first bearing are respectively provided with a locking nut and a spacer sleeve, the axial two sides of the first gear are respectively provided with the second bearing and the locking nut, and the third bearing and the second bearing are arranged at the two ends of the first rotating shaft.

[0013] Optionally, the two ends and the middle part of the second rotating shaft are respectively provided with a fourth bearing, a fifth bearing and a sixth bearing, a transmission gear is arranged in the region between the fifth bearing and the sixth bearing of the second rotating shaft, and the transmission gear is engaged with the third rotating shaft for transmission.

[0014] Optionally, the third rotating shaft is provided with a third gear and a fourth gear, an adjusting gasket is arranged between the third gear and the fourth gear, and the third gear and the fourth gear are engaged with the transmission gear.

[0015] Optionally, the left spindle box and the right spindle box are provided with an internal structure spindle box, and the spindle box comprises:

[0016] A spindle box stator is arranged on the internal structure spindle box, and a spindle box rotor is rotatably arranged on the inner periphery of the spindle box stator, wherein the spindle box rotor is sleeved on the main shaft.

[0017] A brake disc is sleeved on the main shaft, and a hydraulic lock is arranged on the outside of the spindle box and matched with the brake disc.

[0018] Optionally, three bearings are sequentially sleeved on the main shaft, the end of the main shaft is connected with a chuck through a connecting disc, the chuck is used for clamping connection with the end of the crankshaft, and the chuck is connected with an oil cylinder through a pull rod.

[0019] Optionally, the outer periphery of the main shaft is connected with a flange plate through an expansion sleeve, and an encoder is arranged on the flange plate.

[0020] Optionally, the left center frame and the right center frame are center frames with the same structure, a pair of clamping arms are movably arranged on the center frame, a directional block and a supporting block are arranged on the clamping arms, and a center frame arm is arranged between the clamping arms.

[0021] Optionally, the right center frame is arranged on a center frame seat, and the center frame seat is connected with a motor through a lead screw.

[0022] The utility model provides a kind of high-efficiency crankshaft numerical control external milling machine tool, its beneficial effect lies in: the machining tool is separately provided with milling cutter disc on each tool rest box, so it can realize double milling cutter disc processing, in addition, crankshaft workpiece is rotated by left and right spindle box and realizes the feed mode, greatly improves processing efficiency, right spindle box is set as movable structure, so that machine tool can flexibly adapt to the crankshaft processing demand of different lengths, show strong processing flexibility, simultaneously, modular tool holder is matched with hard alloy coating cooperation blade, ensure that the precision of workpiece processed is extremely high, in addition, advanced numerical control system not only improves the degree of automation of machine tool, can also realize automation bus communication with truss mechanical hand, greatly facilitate the data acquisition and monitoring of equipment, further improve production efficiency and processing quality.

[0023] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other objects, features and advantages of the utility model will become more apparent from the following detailed description of exemplary embodiments of the utility model, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views.

[0025] Fig. 1 The structure diagram of a kind of high-efficiency crankshaft numerical control external milling machining tool according to one embodiment of the utility model is shown.

[0026] Fig. 2 The internal structure diagram of left tool rest box according to one embodiment of the utility model is shown.

[0027] Fig. 3 The internal structure diagram of left spindle box according to one embodiment of the utility model is shown.

[0028] Fig. 4 The structure diagram of left center frame and right center frame according to one embodiment of the utility model is shown.

[0029] Mark explanation:

[0030] 1, bed body; 2, left tool holder box; 201, tool holder box; 202, tool holder stator; 203, tool holder rotor; 204, first rotating shaft; 2041, first bearing; 2042, second bearing; 2043, third bearing; 2044, locking nut; 2045, spacer sleeve; 2046, locking nut; 205, second rotating shaft; 2051, fourth bearing; 2052, fifth bearing; 2053, sixth bearing; 206, second gear; 207, first gear; 208, third rotating shaft; 2081, third gear; 2082, fourth gear; 2083, adjusting gasket; 209, cutter head; 3, right tool holder box; 4, slide plate; 5, X-axis feeding system; 6, slide saddle; 7, Z-axis feeding system; 8, left spindle box; 801, spindle box stator; 802, spindle box rotor; 803, main shaft; 804, brake disc; 805, hydraulic lock; 806, first main shaft bearing; 807, second main shaft bearing; 808, third main shaft bearing; 809, connecting disc; 810, chuck; 811, pull rod; 812, oil cylinder; 813, expansion sleeve; 814, flange plate; 815, encoder; 9, right spindle box; 10, left headstock; 1001, clamping arm; 1002, orientation block; 1003, support block; 1004, headstock arm; 11, right headstock; 12, headstock seat; 13, lead screw; 14, motor. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application is more complete and complete, and the scope of the present application is fully conveyed to those skilled in the art.

[0032] The present application provides a kind of high-efficiency crankshaft numerical control external milling machine tool, including:

[0033] Bed body, at least two tool holder boxes are movably arranged on the upper part, the tool holder box is arranged on slide plate, slide plate is connected with slide saddle by X-axis feeding system, and slide saddle is connected with bed body by Z-axis feeding system;

[0034] Left spindle box is fixedly arranged on the lower part of bed body, right spindle box is arranged corresponding to left spindle box and is slidably arranged on bed body, and left spindle box and right spindle box are used to be connected with the end of crankshaft;

[0035] Left headstock and right headstock are arranged between left spindle box and right spindle box, left headstock is fixed on bed body, right headstock is slidably arranged on bed body, and left headstock and right headstock are used to clamp the middle part of crankshaft.

[0036] Specifically, the machining machine tool is provided with left and right spindle boxes, which drive the crankshaft to rotate through synchronous rotation, thereby improving the machining efficiency; the chuck realizes automatic positioning and clamping of the crankshaft through the oil cylinder, thereby reducing manual operation and ensuring the machining precision of the machine tool; a milling cutter disc is arranged in the tool holder box, and the hard alloy blade which can be turned and pulled can prolong the service life of the cutter and improve the precision of the machined workpiece; the machining machine tool is supported by a high-rigidity bed body and is designed as a horizontal integral casting structure, thereby having high rigidity and high stability.

[0037] Optionally, the tool holder box comprises:

[0038] The tool holder box is internally provided with a tool holder stator and a tool holder rotor, and the tool holder rotor is sleeved on the first rotating shaft;

[0039] The second rotating shaft is sleeved with a second gear, and the second gear is engaged with the first gear on the first rotating shaft;

[0040] The third rotating shaft is engaged with the second rotating shaft for transmission, and the end of the third rotating shaft is connected with the cutter disc located outside the tool holder box.

[0041] Specifically, the three rotating shafts in the tool holder box are arranged in parallel, a conventional structure of a stator and a rotor in a motor is adopted, electromagnetic energy is converted into mechanical energy through the action of a magnetic coil, the rotation of the first rotating shaft is realized, and finally the third rotating shaft is transmitted through gear engagement, thereby driving the cutter disc to perform cutting machining.

[0042] Optionally, the outer periphery of the first rotating shaft is sleeved with a first bearing, a second bearing and a third bearing in sequence, the axial two sides of the first bearing are respectively provided with a locking nut and a spacer sleeve, the axial two sides of the first gear are respectively provided with a second bearing and a locking nut, and the third bearing and the second bearing are arranged at the two ends of the first rotating shaft.

[0043] Optionally, the two ends and the middle part of the second rotating shaft are respectively provided with a fourth bearing, a fifth bearing and a sixth bearing, the region between the fifth bearing and the sixth bearing of the second rotating shaft is provided with a transmission gear, and the transmission gear is engaged with the third rotating shaft for transmission.

[0044] Optionally, the third rotating shaft is provided with a third gear and a fourth gear, an adjusting gasket is arranged between the third gear and the fourth gear, and the third gear and the fourth gear are engaged with the transmission gear.

[0045] Specifically, the three rotating shafts in the tool holder box are provided with three bearings on each rotating shaft, thereby ensuring the stable rotation of the rotating shaft, and torque transmission is realized through engagement transmission.

[0046] Optionally, the left spindle box and the right spindle box are provided with an internal-structure shaft box, and the shaft box comprises:

[0047] The shaft box stator is internally rotatably provided with a shaft box rotor, and the shaft box rotor is sleeved on the main shaft;

[0048] The brake disc is sleeved on the main shaft, and the outer portion of the shaft box is provided with a hydraulic lock matched with the brake disc.

[0049] Optionally, three bearings are sequentially sleeved on the main shaft, the end portion of the main shaft is connected with the chuck through a connecting disc, the chuck is used for clamping connection with the end portion of the crankshaft, and the chuck is connected with the oil cylinder through a pull rod.

[0050] Specifically, the oil cylinder drives the pull rod to extend and retract, so that the chuck is locked and released to the end portion of the crankshaft, and the connection structure among the oil cylinder, the pull rod and the chuck is a conventional transmission structure in the field; the structure can also realize the relative sliding of the plurality of sliders on the chuck through electric control, so that the crankshaft is clamped and released, the chuck is provided with a plurality of sliders in the radial direction, the sliders move along the radial direction of the chuck, when a locking electric signal is sent, the sliders are controlled to move to the center of the chuck, the sliders can clamp the end portion of the crankshaft in contact with the chuck, when a disconnecting electric signal is sent, the sliders are controlled to move to the outer periphery of the chuck, and the sliders are separated from the end portion of the crankshaft, so that the crankshaft workpiece can be replaced.

[0051] Optionally, the outer periphery of the main shaft is connected with the flange plate through an expansion sleeve, and the flange plate is provided with an encoder.

[0052] Optionally, the left center frame and the right center frame are center frames with the same structure, a pair of clamping arms are movably arranged on the center frame, directional blocks and supporting blocks are arranged on the clamping arms, and a center frame arm is arranged between the clamping arms.

[0053] Optionally, the right center frame is arranged on a center frame seat, and the center frame seat is connected with the motor through a lead screw.

[0054] Specifically, the left center frame on the bed body is fixedly arranged, the right center frame is slidably arranged by being driven by the motor, a pair of clamping arms and a center frame arm are arranged on each center frame, a three-jaw structure is formed, the connecting rod of the crankshaft workpiece is clamped by the two directional blocks, angular positioning is realized, the main shaft diameter of the crankshaft workpiece is clamped by the two supporting blocks and the center frame arm, and the function of auxiliary three-point support is realized.

[0055] Embodiment

[0056] As shown in Figs. 1 to 4 The utility model provides a kind of high-efficiency crankshaft numerical control external milling machine tool, comprising:

[0057] Bed body 1, left tool rest box 2 and right tool rest box 3 are movably arranged on the upper portion, tool rest box is arranged on slide plate 4, slide plate 4 is connected with slide saddle 6 by X-axis feeding system 5, and slide saddle 6 is connected with bed body 1 by Z-axis feeding system 7;

[0058] A left spindle box 8 is fixedly arranged at the lower part of the lathe bed 1, and a right spindle box 9 is correspondingly arranged with the left spindle box 8 and slidably arranged on the lathe bed 1, and the left spindle box 8 and the right spindle box 9 are used to connect with the end of the crankshaft;

[0059] A left center bracket 10 and a right center bracket 11 are arranged between the left spindle box 8 and the right spindle box 9, the left center bracket 10 is fixed on the lathe bed 1, and the right center bracket 11 is slidably arranged on the lathe bed 1, and the left center bracket 10 and the right center bracket 11 are used to clamp the middle part of the crankshaft.

[0060] In the embodiment, the internal structures of the left tool holder box 2 and the right tool holder box 3 are correspondingly arranged, wherein the left tool holder box 2 comprises:

[0061] A tool holder box 201 is internally provided with a tool holder stator 202 and a tool holder rotor 203, and the tool holder rotor 203 is sleeved on a first rotating shaft 204;

[0062] A second rotating shaft 205 is sleeved with a second gear 206, and the second gear 206 is engaged with a first gear 207 on the first rotating shaft 204;

[0063] A third rotating shaft 208 is engaged with the second rotating shaft 205 for transmission, and the end of the third rotating shaft 208 is connected with a tool disc 209 located outside the left tool holder box 2.

[0064] In the embodiment, the outer periphery of the first rotating shaft 204 is sequentially sleeved with a first bearing 2041, a second bearing 2042 and a third bearing 2043, the axial both sides of the first bearing 2041 are respectively provided with a locking nut 2044 and a spacer 2045, the axial both sides of the first gear 207 are respectively provided with the second bearing 2042 and a locking nut 2046, and the third bearing 2043 and the second bearing 2042 are arranged at both ends of the first rotating shaft 204.

[0065] In the embodiment, the two ends and the middle part of the second rotating shaft 205 are respectively provided with a fourth bearing 2051, a fifth bearing 2052 and a sixth bearing 2053, a transmission gear is arranged in the region of the second rotating shaft 205 between the fifth bearing 2051 and the sixth bearing 2052, and the transmission gear is engaged with the third rotating shaft 208 for transmission.

[0066] In the embodiment, the third rotating shaft 208 is provided with a third gear 2081 and a fourth gear 2082, an adjusting gasket 2083 is arranged between the third gear 2081 and the fourth gear 2082, and the third gear 2081 and the fourth gear 2082 are engaged with the transmission gear.

[0067] In the embodiment, the left spindle box 8 and the right spindle box 9 are provided with the spindle box with internal structure, and the left spindle box 8 comprises:

[0068] The shaft box stator 801 is arranged on the inner periphery of the shaft box rotor 802, and the shaft box rotor 802 is sleeved on the main shaft 803.

[0069] The brake disc 804 is sleeved on the main shaft 803, and the outer portion of the left shaft box 8 is provided with the hydraulic lock 805 which cooperates with the brake disc 804.

[0070] In the embodiment, the first main shaft bearing 806, the second main shaft bearing 807 and the third main shaft bearing 808 are sequentially sleeved on the main shaft 803, the end portion of the main shaft 803 is connected with the chuck 810 through the connecting disc 809, the chuck 810 is used for clamping connection with the end portion of the crankshaft, and the chuck 810 is connected with the oil cylinder 812 through the pull rod 811.

[0071] In the embodiment, the outer periphery of the main shaft 803 is connected with the flange disc 814 through the expansion sleeve 813, and the flange disc 814 is provided with the encoder 815.

[0072] In the embodiment, the left center frame 10 and the right center frame 11 are center frames with the same structure, a pair of clamping arms 1001 are movably arranged on the center frame, the directional block 1002 and the supporting block 1003 are arranged on the clamping arm 1001, and the center frame arm 1004 is arranged between the two clamping arms 1001.

[0073] In the embodiment, the right center frame 11 is arranged on the center frame seat 12, and the center frame seat 12 is connected with the motor 14 through the lead screw 13.

[0074] In summary, the machining tool includes the bed body 1, the left shaft box 8, the right shaft box 9, two center frames, the left tool holder box 2, the right tool holder box 3, the slide saddle 6, the slide plate 4, the X-axis feeding system 5, the Z-axis feeding system 7 and the like.

[0075] The two slide saddles 6 are arranged on the upper portion of the bed body 1, and the two shaft boxes and the two center frames are arranged on the lower portion of the bed body 1; the two slide plates 4 are arranged on the slide saddles 6 respectively and move up and down through the X-axis feeding system 5; the two slide saddles 6 move horizontally through the Z-axis feeding system 7; the left tool holder box 2 and the right tool holder box 3 are arranged on the two slide plates 4 respectively; the lower portion of the left center frame 10 is fixedly arranged on the guide rail of the bed body 1, and the right center frame 11 moves axially through the lead screw 13 driven by the motor 14.

[0076] The internal structures of the left and right tool holder boxes are consistent. Taking the left tool holder box as an example, a tool holder stator 202 is installed in the tool holder box, a tool holder rotor 203 is installed on a first rotating shaft 204, and the first rotating shaft 204 is driven to rotate by the tool holder rotor 203. Three kinds of bearings are arranged on the first rotating shaft 204 from left to right, which are a first bearing 2041, a second bearing 2042 and a third bearing 2043. The second bearing 2042 is axially fixed by a lock nut 2046 and a spacer sleeve 2045. A first gear 207 is arranged between the first bearing 2041 and the lock nut 2046, and the torque of the first rotating shaft 204 is transmitted to a second rotating shaft 205 through a second gear 206. Three kinds of bearings are arranged on the second rotating shaft 205 from left to right, which are a fourth bearing 2051, a fifth bearing 2052 and a sixth bearing 2053. The gear part of the second rotating shaft 205 is arranged between the fifth bearing 2052 and the sixth bearing 2053, and the torque is transmitted to a third rotating shaft 208 through a third gear 2081 and a fourth gear 2082. The relative positions of the third gear 2081 and the fourth gear 2082 are adjusted by adjusting shims 2083 to realize mechanical meshing gap adjustment of the gear part on the second rotating shaft 205. Three kinds of bearings are arranged on the third rotating shaft 208 from left to right, and a cutter head 209 is installed on the end of the third rotating shaft 208 for cutting workpieces.

[0077] The internal structures of the left and right spindle boxes are consistent. Taking the left spindle box 8 as an example, the left spindle box 8 is installed on the bed 1. A spindle stator 801 is installed in the left spindle box 8, a spindle 803 is connected with a spindle rotor 802 through an expansion sleeve 813, and the spindle 803 is driven to rotate by the spindle rotor 802. An encoder 815 is installed on a flange plate 814 and fixed with the spindle 803 through the expansion sleeve 813. A hydraulic lock 805 acts on a brake disc 804 to realize the braking function, and is fixed on the left spindle box 8 through a support. The spindle 803 is arranged with three kinds of bearings from left to right, which are a first spindle bearing 806, a second spindle bearing 807 and a third spindle bearing 808. A chuck 810 is connected with the spindle 803 through a connecting disc 809, and the chuck 810 is locked and unlocked with a crankshaft through a pull rod 811 driven by an oil cylinder 812.

[0078] Two center frames are arranged in the middle of the bed 1. The left center frame 10 is fixed on the bed 1 through a center frame seat, and the right center frame 11 is fixed on the center frame seat 12 and axially moved by a lead screw 13 driven by a motor 14. The two center frames are consistent in structure and are both three-jaw self-centering center frames. A directional block 1002 and a supporting block 1003 are installed on a clamping arm 1001. The directional block 1002 is used for clamping the connecting rod of the crankshaft workpiece and plays an angular positioning function. The supporting block 1003 and a center frame arm 1004 are used for clamping the main shaft diameter of the crankshaft workpiece and play an auxiliary three-point supporting role.

[0079] The above has described various embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A high-efficiency CNC external milling machine tool for crankshafts, characterized in that, include: The bed has at least two tool post boxes movably mounted on its upper part. The tool post boxes are mounted on a slide plate, which is connected to a saddle via an X-axis feed system. The saddle is connected to the bed via a Z-axis feed system. The left spindle box is fixedly installed at the lower part of the bed, and the right spindle box is correspondingly installed and slidably installed on the bed. The left spindle box and the right spindle box are used to connect to the end of the crankshaft. A left center frame and a right center frame are disposed between the left spindle box and the right spindle box. The left center frame is fixed to the bed, and the right center frame is slidably disposed on the bed. The left center frame and the right center frame are used to clamp the middle part of the crankshaft. The tool holder box includes: The tool post box contains a tool post stator and a tool post rotor, with the tool post rotor mounted on a first rotating shaft. A second rotating shaft is fitted with a second gear, which meshes with a first gear on the first rotating shaft; The third rotating shaft meshes with the second rotating shaft for transmission, and the end of the third rotating shaft is connected to the tool disc located outside the tool holder box.

2. The high-efficiency crankshaft CNC external milling machine tool according to claim 1, characterized in that, The outer circumference of the first rotating shaft is sequentially fitted with a first bearing, a second bearing, and a third bearing. A locking nut and a spacer are respectively provided on both axial sides of the first bearing. A second bearing and the locking nut are respectively provided on both axial sides of the first gear. The third bearing and the second bearing are located at both ends of the first rotating shaft.

3. The high-efficiency crankshaft CNC external milling machine tool according to claim 1, characterized in that, The second rotating shaft has a fourth bearing, a fifth bearing, and a sixth bearing at its two ends and in the middle, respectively. A transmission gear is provided in the area between the fifth bearing and the sixth bearing on the second rotating shaft, and the transmission gear meshes with the third rotating shaft for transmission.

4. The high-efficiency crankshaft CNC external milling machine tool according to claim 3, characterized in that, The third rotating shaft is provided with a third gear and a fourth gear, and an adjusting shim is provided between the third gear and the fourth gear. The third gear and the fourth gear mesh with the transmission gear.

5. The high-efficiency crankshaft CNC external milling machine tool according to claim 1, characterized in that, The left and right spindle boxes are equipped with internal structures, and the spindle boxes include: A shaft box stator has a shaft box rotor rotatably mounted on its inner circumference, and the shaft box rotor is sleeved on the main shaft; A brake disc is mounted on the main shaft, and a hydraulic lock is provided on the outside of the axle box, which cooperates with the brake disc.

6. The high-efficiency crankshaft CNC external milling machine tool according to claim 5, characterized in that, Three bearings are sequentially mounted on the main shaft. The end of the main shaft is connected to a chuck via a connecting disc. The chuck is used to engage with the end of the crankshaft. The chuck is connected to a hydraulic cylinder via a pull rod.

7. The high-efficiency crankshaft CNC external milling machine tool according to claim 5, characterized in that, The outer periphery of the spindle is connected to the flange via an expansion sleeve, and an encoder is installed on the flange.

8. The high-efficiency crankshaft CNC external milling machine tool according to claim 1, characterized in that, The left center frame and the right center frame are center frames with the same structure. A pair of clamping arms are movably arranged on the center frame. The clamping arms are provided with directional blocks and support blocks. A center frame arm is arranged between the clamping arms.

9. The high-efficiency crankshaft CNC external milling machine tool according to claim 1, characterized in that, The right center frame is mounted on the center frame base, which is connected to the motor via a lead screw.

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