Hollow transmission shaft manufacturing device based on double-spindle numerical control lathe

Abstract

The utility model provides a hollow transmission shaft manufacturing device based on a double-spindle numerical control lathe, which belongs to the field of lathe machining and comprises a lathe base, a first spindle and a second spindle, and the first spindle and the second spindle are used for clamping a transmission shaft to be machined and are correspondingly arranged at the left end and the right end of the lathe base. A first linear rail and a second linear rail which are parallel to each other are fixed to the lathe base, the first spindle is slidably connected with the first linear rail, the second spindle is fixed to the lathe base, the second linear rail is slidably connected with a saddle, an inclined third linear rail is fixed to the saddle, and the third linear rail is slidably connected with a turning assembly used for machining a transmission shaft. The third linear rail is perpendicular to the first linear rail in space. According to the scheme, the feeding, discharging and conveying processes such as disassembly and clamping of parts between different machining devices are omitted, the purpose of machining the hollow transmission shaft on a single lathe is successfully achieved, and therefore the equipment investment cost is remarkably reduced, and the machining period is shortened.

Description

Technical Field

[0001] The utility model belongs to the field of lathe machining, and in particular relates to a hollow transmission shaft manufacturing device based on a double-spindle CNC lathe. Background Art

[0002] As a key transmission component of automobiles, the hollow drive shaft has the characteristics of lightweight and high performance compared to the solid shaft. It can effectively transmit greater power torque and show excellent dynamic balance performance at high speed. However, due to the particularity of the hollow structure, the overall processing of the hollow drive shaft is difficult and the process is complicated.

[0003] In the traditional manufacturing process of hollow drive shafts, the drive shaft is divided into three parts for processing: the left and right components are forged from round steel and then rough-processed, the middle section is processed using cold-drawn seamless pipes as blanks, and after completing the processing of each part, the three components are welded and assembled into a whole in sequence, and finally heat treated and metal cut to meet the final manufacturing requirements of the finished product. This complex processing process involves multiple blanks, multiple equipment, multiple processes, and multiple station conversions, and there are problems such as high material and equipment costs, low processing efficiency, and low part precision, which seriously limits the application of hollow drive shafts in the field of automotive parts.

[0004] A dual-spindle machining center is disclosed (patent application number: CN202323048774.5), which includes a movable box, an operating table, and a first machining mechanism and a second machining mechanism arranged on the operating table; the movable box is arranged on the top of the operating table, a support plate is arranged in the operating table, two rotating blocks are arranged on the support plate, both of the two rotating blocks are rotatably connected with a screw rod, a driving mechanism for driving the screw rod to rotate is installed in the operating table, one end of the two screw rods away from the rotating block is rotatably connected with a fixed block, the fixed block is connected to the movable box through a sliding mechanism, and the bottom of the inner cavity of the movable box is fixedly connected with a limit block matching with the screw rod thread.

[0005] This disclosed solution can adjust the distance of the moving box up and down by setting a screw rod, a turntable and a drive assembly, and can adjust the angle of component processing to increase the processing range of the workpiece. However, the adjustment angle of the moving box is limited and it can only move up and down, and further improvement is still needed. Utility Model Content

[0006] The present application provides a hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe, aiming to solve the problems that the traditional hollow transmission shaft processing process involves multiple blanks, multiple equipment, multiple processes and multiple station conversions, and has high material and equipment costs, low processing efficiency, low part precision, and the adjustment angle of the moving box of the above-mentioned dual-spindle processing machine tool is limited and can only move up and down.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe comprises a lathe base, a first spindle and a second spindle for clamping the transmission shaft to be processed, the second spindle and the first spindle are respectively arranged at the left and right ends of the lathe base, the lathe base is fixed with a first linear rail and a second linear rail which are parallel to each other, the first spindle is slidably connected to the first linear rail, the second spindle is fixed to the lathe base, the second linear rail is slidably connected to a saddle, the saddle is fixed with an inclined third linear rail, the third linear rail is slidably connected to a turning assembly for processing the transmission shaft, and the third linear rail is perpendicular to the first linear rail in space.

[0009] Preferably, the turning assembly includes a double-sided turret, a first drive motor and a first sliding base, the double-sided turret is connected to the output end of the first drive motor, the bottom of the first drive motor is fixed to the first sliding base, and the first sliding base is slidably connected to the third linear rail.

[0010] Preferably, the double-sided turret is equipped with a conversion mechanism, a tool holder is fixed at the edge of the conversion mechanism, and a tool is installed on the tool holder.

[0011] Preferably, the angle between the third linear rail and the horizontal plane is 30 degrees.

[0012] Preferably, the plane where the first linear rail is located is lower than the plane where the second linear rail is located in the vertical direction.

[0013] Preferably, the second spindle comprises a second drive motor and a first chuck, and the first chuck is connected to an output end of the second drive motor.

[0014] Preferably, the first spindle includes a second chuck, a second sliding base and a third drive motor, the second sliding base is located at the bottom of the first spindle and is slidably connected to the first linear rail, and the second chuck is connected to the output end of the third drive motor.

[0015] Preferably, the second clamp is equipped with a hydraulic three-jaw chuck for fixing the transmission shaft.

[0016] The utility model has the following beneficial effects:

[0017] (1) This solution integrates the first spindle and the second spindle into the CNC lathe, which can realize the function of performing multiple processing steps on one workstation; on the one hand, the dual-spindle structure is equipped with a special double-headed tool, which can simultaneously process the inner circles of the two parts of the transmission shaft, significantly improving the processing efficiency, and effectively ensuring the dimensional accuracy of the parts through synchronous processing; on the other hand, the dual-spindle design realizes non-stop processing at both ends of the workpiece, without the need for multiple clamping, which reduces the processing time while ensuring the processing accuracy of the parts;

[0018] (2) This solution provides an integrated CNC lathe with friction welding and turning functions, eliminating the loading and unloading and conveying processes such as disassembly and clamping of parts between different processing equipment, and successfully achieves the goal of completing the processing of hollow transmission shafts on a single lathe, thereby significantly reducing equipment investment costs and shortening processing cycles;

[0019] (3) The process of this scheme uses cylindrical bars as blanks and friction welding and turning as the main processing methods. Compared with the process of traditional processing that requires the use of multiple blanks and undergoes multiple processes (such as forging, welding, turning, and cold drawing), it has the advantages of high efficiency and low cost;

[0020] (4) Under the action of the second linear rail and the third linear rail, the turning assembly can slide axially or radially, and the radial direction is inclined. While expanding the processing range of the workpiece, it also increases the convenience of operation and facilitates the discharge of chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the manufacturing device of the utility model from the first perspective;

[0022] Figure 2 It is a structural schematic diagram of the manufacturing device of the utility model from a second viewing angle;

[0023] Figure 3 for Figure 2 A partial enlarged view of the middle A area;

[0024] Figure 4 It is a structural schematic diagram of the manufacturing device of the utility model from the third viewing angle.

[0025] Among them, 1-lathe base, 11-first linear rail, 12-second linear rail, 2-first spindle, 21-second clamp, 22-hydraulic three-jaw chuck, 23-second sliding base, 24-driving motor, 3-turning assembly, 31-conversion mechanism, 32-tool holder, 33-tool, 34-double-sided turret, 35-first driving motor, 36-first sliding base, 4-second spindle, 41-second driving motor, 42-first clamp, 5-saddle, 51-third linear rail. DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figure 1-4As shown, a hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe includes a lathe base 1, a first spindle 2 and a second spindle 4 for clamping the transmission shaft to be processed, the second spindle 4 and the first spindle 2 are correspondingly arranged at the left and right ends of the lathe base 1, the lathe base 1 is fixed with a first linear rail 11 and a second linear rail 12 which are parallel to each other, the first spindle 2 is slidably connected to the first linear rail 11, the second spindle 4 is fixed to the lathe base 1, the second linear rail 12 is slidably connected to a saddle 5, the saddle 5 is fixed with an inclined third linear rail 51, the third linear rail 51 is slidably connected to a turning assembly 3 for processing the transmission shaft, and the third linear rail 51 is perpendicular to the first linear rail 11 in space.

[0028] The turning assembly 3 can move axially or radially under the action of the second linear rail 12 and the third linear rail 51 .

[0029] The turning assembly 3 includes a double-sided turret 34, a first drive motor 35 and a first sliding base 36. The double-sided turret 34 is connected to the output end of the first drive motor 35. The bottom of the first drive motor 35 is fixed to the first sliding base 36. The first sliding base 36 is slidably connected to the third linear rail 51.

[0030] The double-sided turret 34 is equipped with a conversion mechanism 31 , a tool holder 32 is fixed at the edge of the conversion mechanism 31 , and a tool 33 is installed on the tool holder 32 .

[0031] A tool holder 32 is fixed at the edge of the conversion mechanism 31. The number of tool holders 32 can be multiple, and different tools 33 are installed on different tool holders 32. When in use, the conversion mechanism 31 rotates under the action of the first drive motor 35 to adjust the tool 33 to be used to a specified position.

[0032] The included angle between the third linear rail 51 and the horizontal plane is 30 degrees.

[0033] The inclined design increases the convenience of operation and facilitates the discharge of chips.

[0034] The plane where the first linear rail 11 is located is lower than the plane where the second linear rail 12 is located in the vertical direction.

[0035] This horizontal high and low arrangement is conducive to the processing of large workpieces.

[0036] The second spindle 4 includes a second drive motor 41 and a first clamp 42 . The first clamp 42 is connected to an output end of the second drive motor 41 .

[0037] The first spindle 2 includes a second chuck 21 , a second sliding base 23 and a third drive motor 24 . The second sliding base 23 is located at the bottom of the first spindle 2 and is slidably connected to the first linear rail 11 . The second chuck 21 is connected to the output end of the third drive motor 24 .

[0038] The working process of this device:

[0039] S1, for example, this embodiment implements the manufacturing process of an alloy steel automobile hollow transmission shaft with a length of 600 mm. Material preparation, two sections of alloy steel cylindrical bars with a length of 305 mm are selected as blanks, where 305 mm is equal to half of the design length of the hollow transmission shaft plus a processing allowance of 5 mm;

[0040] S2, clamping, start the power supply, load the first section of the blank into the first clamping barrel 42 of the second spindle 4, and load the second section of the blank into the second clamping barrel 21 of the first spindle 2, and the clamping length of both is 30 mm;

[0041] S3, drilling a center hole, replacing the tool 33 with a double-head drill, driving the first spindle 2 and the tool 33 to move axially at the same time to approach the second spindle 4, and drilling center holes in the two blanks synchronously, with a center hole depth of 150 mm;

[0042] S4, turning inner holes. After the center hole is processed, the tool is retracted and tool 33 is replaced with a double-ended internal turning tool. Similar operations are performed in S3 to turn the inner holes of the two blanks simultaneously. The turning depth is 150 mm.

[0043] S5, friction welding, retract the tool until the tool 33 is not in contact with the workpiece, set the speed of the second spindle 4 to 2000 rpm, set the speed of the first spindle 2 to 200 rpm, drive the first spindle 2 to move axially close to the second spindle 4 until the two workpieces are in contact for friction welding;

[0044] S6, turning the outer circle, replacing the tool 33 with an outer circle turning tool, driving the tool 33 to move axially between the second spindle 4 and the first spindle 2, and sequentially performing rough turning, fine turning and step turning operations on the unclamped outer surface of the welded workpiece;

[0045] S7, turning the left end of the workpiece, retracting the tool, releasing the clamping of the workpiece by the first chuck 42, driving the first spindle 2 to axially move away from the second spindle 4 until the clamping portion of the left end of the workpiece of 30 mm is completely exposed, turning the surface of the clamping portion of the left end of the workpiece, and processing the end face to remove the machining allowance at the left end;

[0046] S8, turn the right end of the workpiece, retract the tool, drive the first spindle 2 to move axially close to the second spindle 4 until it returns to the initial state of S7, drive the first chuck 42 to clamp and fix the turned end of the workpiece, then the second chuck 21 releases the workpiece, drive the first spindle 2 to move axially away from the second spindle 4 until the clamping part of 30 mm on the right end of the workpiece is completely exposed, turn the surface of the clamping part at the right end of the workpiece, and at the same time process the end face to remove the machining allowance at the right end.

[0047] Among them, in step S3, after the tool is changed, the positions of the tool 33 and the first spindle 2 need to be adjusted until the first section of the blank, the tool, and the second section of the blank are in contact in sequence and the axes of the three coincide before the drilling operation is performed; when drilling, the axial movement speed of the first spindle 2 is twice the axial movement speed of the tool 33. In step S5, two blanks with a blind hole of 150mm in depth are connected by friction welding to form an integrated hollow cylindrical workpiece with a total length of 610mm. In this workpiece, the length of the hollow part is 300mm, and the length of the surface that can be turned without being clamped is 550mm. In steps S7 and S8, the operations are performed without stopping the machine, in which the rotation speeds of the two spindles are kept consistent and set to the optimal rotation speed suitable for alloy steel cutting.

[0048] Example 2

[0049] The difference between this embodiment and embodiment 1 is that: Figure 2 As shown, the second clamping cylinder 21 is installed with a hydraulic three-jaw chuck 22 for fixing the transmission shaft.

[0050] The hydraulic three-jaw chuck 22 can more effectively fix the transmission shaft so as to keep the workpiece in a stable state during the mobile processing.

[0051] Example 3

[0052] The difference between this embodiment and the first embodiment is that the first clamping cylinder 42 is equipped with a hydraulic three-jaw chuck 22 .

[0053] The first clamping cylinder 42 may also be installed with a hydraulic three-jaw chuck 22 , which also improves the clamping effect of the second spindle 4 on the workpiece.

[0054] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe, comprising a lathe base (1), a first spindle (2) and a second spindle (4) for clamping the transmission shaft to be processed, wherein the second spindle (4) and the first spindle (2) are respectively arranged at the left and right ends of the lathe base (1), and characterized in that: A lathe base (1) is fixed with a first linear rail (11) and a second linear rail (12) which are parallel to each other; a first spindle (2) is slidably connected to the first linear rail (11); a second spindle (4) is fixed to the lathe base (1); a saddle (5) is slidably connected to the second linear rail (12); an inclined third linear rail (51) is fixed to the saddle (5); a turning assembly (3) for machining a transmission shaft is slidably connected to the third linear rail (51); and the third linear rail (51) is vertical to the first linear rail (11) in space.

2. The hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to claim 1 is characterized in that: The turning assembly (3) comprises a double-sided turret (34), a first drive motor (35) and a first sliding base (36); the double-sided turret (34) is connected to the output end of the first drive motor (35); the bottom of the first drive motor (35) is fixed to the first sliding base (36); and the first sliding base (36) is slidably connected to the third linear rail (51).

3. The hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to claim 2 is characterized in that: The double-sided turret (34) is equipped with a conversion mechanism (31), a tool holder (32) is fixed at the edge of the conversion mechanism (31), and a tool (33) is installed on the tool holder (32).

4. The hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to claim 1 is characterized in that: The angle between the third linear rail (51) and the horizontal plane is 30 degrees.

5. A hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to any one of claims 1 to 4, characterized in that: The plane where the first linear rail (11) is located is lower than the plane where the second linear rail (12) is located in the vertical direction.

6. The hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to claim 1 is characterized in that: The second main shaft (4) comprises a second driving motor (41) and a first clamp (42), and the first clamp (42) is connected to the output end of the second driving motor (41).

7. The hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to claim 1 is characterized in that: The first main shaft (2) comprises a second clamp (21), a second sliding base (23) and a third drive motor (24); the second sliding base (23) is located at the bottom of the first main shaft (2) and is slidably connected to the first linear rail (11); and the second clamp (21) is connected to the output end of the third drive motor (24).

8. The hollow transmission shaft manufacturing device based on a dual-spindle CNC lathe according to claim 7 is characterized in that: The second clamping cylinder (21) is equipped with a hydraulic three-jaw chuck (22) for fixing the transmission shaft.

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