Flat wire stator end cutting die and cutting device

Abstract

The application discloses a flat wire stator end cutting die and a cutting device, the cutting die comprises a tool disc and a rotating base, an inner cavity is formed between the tool disc and the rotating base, and a cutting knife rotating assembly is arranged in the cavity, the cutting knife rotating assembly comprises a moving knife disc, a rotating disc, a hollow rotating shaft and a rotating rod, a plurality of flat wire insertion grooves corresponding to each group of radial flat wires of the stator are arranged on the tool disc, and a plurality of flat wire insertion holes are arranged on the cutting knife disc, at least part of the flat wire insertion holes can accommodate a plurality of groups of radial flat wires at a time, and the cutting knife disc cuts the plurality of groups of radial flat wires accommodated by the cutting knife disc in a mode of cutting one group of radial flat wires at a time. The driving force required by the cutting head is greatly reduced by controlling the cutting mode of the cutting knife disc.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicle driving motor, and particularly relates to a flat wire stator end cutting die and a cutting device. BACKGROUND

[0002] In the process of manufacturing the flat wire stator, the uneven hairpin flat wires after twisting need to be cut flat. If the two flat wires combined with each other have a height difference, the welding effect will be affected; the height difference of different welding points in the same plane will indirectly change the laser focal length (laser welding) or the arc striking distance, thereby causing unqualified welding or poor consistency, so the cutting operation must be performed before welding.

[0003] At present, various methods are adopted for cutting, some of which are manual cutting, low in efficiency and low in precision; some of which are radial punching, which is difficult to avoid long hairpin cutting and is easy to be miscut.

[0004] Chinese patent document CN105490479 discloses a manufacturing method of a flat wire motor stator winding, which discloses a wire cutting mechanism, designs a cutting upper die and a cutting movable die, the cutting upper die is provided with a wire insertion hole corresponding to the flat wire motor, the cutting movable die is also provided with a cutting insertion hole, when the wire is inserted into the cutting movable die wire insertion hole from the cutting upper die wire insertion hole, the cutting movable die is rotated to cut the wire in the cutting movable die wire insertion hole.

[0005] In the process of implementing the present application, we found that the above-mentioned wire cutting mechanism has the following problems: 1, the cutting movable die has a large shearing force when cutting, so not only a large driving force (double cylinder driving) is needed, but also a high strength structure design is needed; 2, the space below the lower pressing cylinder is limited, and if integrated on the automatic line body and using the existing stator clamping jaw to change the material, there will be obstacles. SUMMARY

[0006] The present application aims at a flat wire stator end cutting die and a cutting device to overcome the problem of excessive shearing force of the cutting knife when cutting.

[0007] To this end, the present application provides a flat wire stator end cutting die, the cutting die comprising a tooling disc and a rotating base, forming an inner cavity therebetween for accommodating a cutting knife rotating assembly, the cutting knife rotating assembly comprising a moving knife disc, a rotating disc and a hollow rotating shaft, wherein the moving knife disc is located below the tooling disc, the rotating disc is located below the moving knife disc and is used to drive the moving knife disc, the hollow rotating shaft is located below the rotating disc and is fixedly connected with the rotating disc, the rotating disc is connected with a rotating rod extending outward from the rotating base, the tooling disc is provided with a flat wire insertion slot corresponding to each group of radial flat wires of the stator, and the cutting knife disc is provided with a plurality of flat wire insertion holes, wherein at least a part of the flat wire insertion holes accommodate a plurality of groups of radial flat wires at one time, and the cutting knife disc cuts the plurality of groups of radial flat wires accommodated thereby in a manner of cutting one group of radial flat wires at one time.

[0008] According to another aspect of the present application, a flat wire stator end cutting device is provided, comprising a flat wire stator end cutting die, a cutting die driving mechanism, a stator lifting slide table and a pressing cylinder, wherein the stator lifting slide table has a cutting die station horizontally moving to the directly above of the cutting die and a spare changing station away from the cutting die station, and is used to carry the stator to be lowered into the cutting die and to reach the flat wire cutting position, and the cutting die driving mechanism is used to drive the rotating rod to make the moving knife disc make a shearing motion relative to the tooling disc.

[0009] Compared with the prior art, the present application has the following technical effects / advantages:

[0010] (1) By controlling the multiple rotating cutting of the cutting knife disc, the driving force required for cutting is greatly reduced, and the structural strength requirement of the die is also greatly reduced.

[0011] (2) By introducing the stator lifting slide table, the spare changing is realized at a position away from the cutting die station, and the stator insertion into the cutting die and the insertion depth can be controlled.

[0012] (3) The cutting knife is designed to be automatically height-compensated, and after the cutting head is polished, the cutting accuracy can still be ensured.

[0013] (4) The cutting device can cut flat wires of different planes and avoid cutting flat wires that do not need to be cut.

[0014] In addition to the above-described objects, features and advantages, the present application has other objects, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings constituting a part of the specification illustrate the present application and, together with the description, serve to explain the principles of the present application and should not be construed as being unduly limited thereto. In the drawings:

[0016] Figure 1 is a structural schematic diagram of the flat wire stator end cutting device of the present application;

[0017] Figure 2 is a structural schematic diagram of the cutting die of the flat wire stator end cutting device of the present application;

[0018] Figure 3 is a sectional view of the cutting die of the present application Figure 1 ;

[0019] Figure 4 is a sectional view of the cutting die of the present application Figure 2 ;

[0020] Figure 5 is a structural schematic diagram of the cutting knife disc of the cutting die of the present application;

[0021] Figure 6 is a structural schematic diagram of the rotating disc of the cutting die of the present application. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Figure 1 is an axial view of the present device, 100 is the stator to be cut, 200 is the cutting die, 300 is the stator lifting slide, and 400 is the cutting driving device. Among them, the lower pressing cylinder above the top of the stator is not shown in the figure.

[0024] The cutting die 200 and the cutting driving mechanism 400 are both fixed on the unshown base, the stator lifting slide 300 is arranged on a pair of unshown horizontal slide rails and moves along the pair of horizontal slide rails, has a cutting station located directly above the cutting die 200 and a piece changing station (not shown in the figure) away from it. The piece changing station is away from the position of the lower pressing cylinder and has enough space for the stator clamping jaw to grab and change pieces.

[0025] The cutting driving mechanism 400 is connected with the cutting die 200 through the rotating rod 8.

[0026] Figure 2 is an axial view of the cutting die, Figure 3 and Figure 4 is a sectional view of the cutting die, Figure 5 shows the cutting knife disc, Figure 6 shows the rotating disc. The mechanism is provided with a tooling disc 1 and a rotating base 2, the rotating base 2 and the tooling disc 1 form an inner cavity for accommodating the cutting knife rotating assembly.

[0027] The cutter rotating assembly comprises a moving cutter disc 3, a rotating disc 4 and a hollow rotating shaft 5.

[0028] The moving cutter disc 3 is located below the top tooling disc 1, the rotating disc 4 is located below the moving cutter disc 3 and is used to drive the moving cutter disc 3, and the hollow rotating shaft 5 is located below the rotating disc 4 and is fixedly connected with the rotating disc 4, for example, by a plurality of screws.

[0029] One end of the rotating rod 8 is sleeved outside the hollow rotating shaft 5 and is fixedly connected with the rotating rod 8, for example, by a plurality of screws. The rotating rod 8 is extended through the slot 2a on the outer periphery of the rotating base 2 and is driven by the cutter head driving mechanism 400.

[0030] The outer periphery of the rotating base 2 is provided with a buffer mounting seat 11 and a dead block mounting seat 12, the dead block assembly 13 is mounted on the dead block mounting seat 12, and a buffer (not shown in the figure) is mounted on the buffer mounting seat 11. The plurality of dead block assemblies 13 are used to control the lowest height of the stator 100 falling, and the height of the dead block assembly 13 is adjustable. The buffer is used to provide a buffer for the stator 100 falling.

[0031] The hollow rotating shaft 5 is supported in the rotating base 2 by the first bearing 6 and the second bearing 7, for example, a pair of conical roller bearings.

[0032] The installation mode of the first bearing 6 and the second bearing 7 will be described by taking the conical roller bearing as an example. The inner cavity wall of the rotating base 2 is provided with a bearing stop shoulder 2b, which stops the outer ring of the first bearing 6 located above and stops the outer ring of the second bearing 7 located below. At the same time, the inner ring of the first bearing 6 is upper-stopped by the first spacer sleeve 9, and the inner ring of the second bearing 7 is lower-stopped by the second spacer sleeve 10. At the same time, the first spacer sleeve 9 is axially stopped and positioned by the rotating disc 4, and the second spacer sleeve 10 is axially stopped and positioned by the rotating rod 8.

[0033] The cutter disc 3 is provided with a plurality of key grooves 35 arranged along the circumference thereof, the rotating disc 4 is provided with a plurality of driving keys 43 arranged along the circumference thereof, and the cutter disc 3 and the rotating disc 4 are drivingly connected by the embedding of the driving keys 43 and the key grooves 35. At the same time, the cutter disc 3 can also move axially upward relative to the rotating disc 4.

[0034] An automatic compensation mechanism is arranged between the cutter disc 3 and the rotating disc 10, as shown in the figure. Figure 4 The automatic compensation mechanism comprises a top rod 15, a disc spring 16, an adjusting screw 17 and a locking nut 18. The disc spring 16 provides a jacking force, so that after the cutter disc 3 is worn and regrinded, the cutter disc 3 can still be tightly attached to the tooling disc 1, thereby ensuring the effective and stable operation of the cutter. The adjusting screw 17 can adjust the jacking force of the disc spring to a certain extent.

[0035] The stator lifting slide 300 comprises a pair of slide plates 304 and a stator lifting assembly, which comprises a top plate 301, a set of guide columns 303 arranged on the left and right sides of the top plate 301 respectively, and a jacking cylinder 302. The pair of slide plates 304 are arranged apart to support the stator lifting assembly and enable the cutting head die 200 to be located between the slide plates 304. The top plate 301 is provided with a stator positioning tool 305 for positioning and placing the stator.

[0036] The jacking cylinder 302 is used to drive the top plate 301 to lift or lower, and the guide columns 303 provide guidance for the lifting of the top plate. The pair of slide plates 304 can be driven by a linear module, a cylinder or other mechanisms. In addition, the jacking cylinder 302 can be replaced by a jacking drive assembly such as a servo drive mechanism.

[0037] Figure 5 The cutting knife disc 3 is shown, which comprises a knife disc outer ring 31, a knife disc inner ring 32, a plurality of spoke cutters 33, and flat wire insertion holes 34 formed between adjacent two spoke cutters 33. The knife disc outer ring 31 is provided with four key grooves 35 along its circumference, and the side of the knife disc outer ring 31 facing the tooling disc 1 is provided with four recesses 36 and screw holes 37 penetrating through the knife disc outer ring 31 at the bottom of each recess 36. The screw holes 37 are used to install the adjusting screws 17, and the recesses 18 are used to place the locking nuts 18.

[0038] In addition, an operation hole is formed in the tooling disc 1 directly above the recess 36, so that the tooling disc does not need to be disassembled when adjusting the cutting knife disc.

[0039] The tooling disc 1 is provided with a flat wire insertion slot 1a for each group of radial flat wires of the stator, which functions to position and constrain the flat wires.

[0040] The flat wire insertion holes 34 of the cutting knife disc 3 are designed to accommodate a plurality of groups of radial flat wires adjacent in the circumference, for example, the flat wire insertion slot 1a divides the tooling disc 1 into 36 equal parts, and the flat wire insertion holes 34 divide the cutting knife disc 3 into 12 parts. The advantage is that the number of flat wires cut at one time by the cutting knife disc 3 is 1 / 3 of the total flat wires, and the required cutting force is 1 / 3 of the total cutting force, which greatly reduces the driving force required to drive the cutting knife disc. Therefore, the present application does not need to be provided with a double-cylinder configuration, for example, the present application can also meet the driving requirements by using a lead screw and nut driving mechanism. At the same time, the number of spoke cutters is also greatly reduced.

[0041] The cutting head driving mechanism 400 is a servo driving mechanism, which controls the rotation direction and angle of each rotation of the cutting knife disc 3, and can cut the wires in the flat wire insertion holes 34 one by one, while also ensuring that the flat wires that do not need to be cut are not cut. Figure 1 As shown, the cutting head driving mechanism 400 comprises a servo motor 401, a lead screw 402, a nut assembly 403, a motor mounting seat 404, a first bearing seat 405, and a second bearing seat 406.

[0042] Wherein, the screw rod 402 is supported by the first bearing seat 405 and the second bearing seat 406 at both ends, the servo motor 401 is connected with the screw rod 402 through the shaft coupling, the screw rod 402 drives the nut assembly 403 to move, the nut assembly 403 is movably connected with the rotating rod 8, the rotating rod 8 is controlled to rotate, for example, rotates to the left by a predetermined angle to cut the first group of radial flat wires, rotates to the right by a predetermined angle to cut the second group of radial flat wires, and continues to rotate to the right by a predetermined angle to cut the third group of radial flat wires.

[0043] Figure 6 The rotating disc is shown, which comprises a bowl-shaped body 41, a bowl rim 42, a plurality of driving keys 43 arranged circumferentially on the top surface of the bowl rim, a seat hole 44, and a bowl bottom drain hole 45. The driving keys 43 are matched with the key grooves 35 of the cutter disc 3, and the seat hole 44 is used to place the top rod 15 and the disc spring 16.

[0044] The bowl-shaped body 41 mentioned above is directly below all the flat wire insertion holes 34, and can collect all the cuttings, and then falls into the collector below, such as a collection box, through the bowl bottom drain hole 45 and the hollow rotating shaft 5.

[0045] The prior art designs a chip removal channel for each wire insertion hole, and the chip removal channel is narrow, so that the chip generated by the flat wire cutting head cannot be discharged smoothly. The above-mentioned chip removal mode of the present application has a smooth and unobstructed chip removal channel.

[0046] The working process of the device is as follows:

[0047] The stator lifting slide table 300 clamps the stator workpiece by using the stator clamping jaw at the piece changing station, then drives the stator 100 with the cutting head to be cut to move to the cutting head station, and then descends by a certain height, so that the end part of the stator 100 to be cut is inserted into the cutting head die 200, then the lower cylinder is pressed to press the stator, and then the cutting head driving device 400 drives the cutting head mechanism 200 to rotate in stages and cut off the excess end part of the stator 100 in stages. The stator lifting slide table 300 drives the stator 100 to move away from the cutting head die 200 and moves to the piece changing station to discharge. The cutting head driving device 400 drives the cutting head mechanism 200 to return to the original position, and the cutting head is completed.

[0048] The above only describes the embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flat wire stator end-cutting die, characterized in that, It includes a tooling tray and a rotating base, with an inner cavity between them to accommodate the rotating cutter assembly. The cutting blade rotation assembly includes a movable blade disc, a rotating disk, and a hollow rotating shaft. The movable blade disc is located below the tooling disk and is connected to the hollow rotating shaft via the rotating disk. The hollow rotating shaft is connected to a rotating rod extending outward from the rotating base. The tooling tray has flat wire slots arranged one-to-one with each group of radial flat wires in the stator, and the moving tool disc is provided with several flat wire insertion holes, which can accommodate multiple groups of radial flat wires at one time. The moving cutter head is driven by a rotating rod to perform a shearing motion, and the multiple sets of radial flat wires contained in the flat wire socket are cut one set of radial flat wires at a time.

2. The flat wire stator end cutting die according to claim 1, characterized in that, The rotating disk has a bowl-shaped body and a bottom drain hole, wherein the bowl-shaped body is located directly below the flat wire insertion hole and is used to collect chips, which flow from the bottom drain hole and the hollow rotating shaft to the outside of the cutting head module.

3. The flat wire stator end cutting die according to claim 1, characterized in that, The rotating disk is provided with a number of drive keys along its circumference, and the outer circumference of the moving cutter disc is provided with a number of keyways. The rotating disk is provided with a push rod and a disc spring, and the moving cutter disc is provided with an adjusting screw and a locking nut. The number of drive keys and the number of keyways are fitted into each other in a one-to-one correspondence. The adjusting screw is used to tighten the push rod so that the moving cutter disc and the tooling disc can be seamlessly connected.

4. The flat wire stator end cutting die according to claim 1, characterized in that, The hollow rotating shaft is supported in a rotating base by a pair of tapered roller bearings.

5. The flat wire stator end cutting die according to claim 1, characterized in that, The outer periphery of the rotating base is provided with a buffer mounting seat and a dead stop mounting seat. The dead stop mounting seat is equipped with a dead stop assembly for controlling the minimum height of the stator drop. The buffer mounting seat is equipped with a buffer for providing cushioning when the stator drops.

6. A flat wire stator end cutting device, characterized in that, The device includes a flat wire stator end cutting die, a cutting drive mechanism, a stator lifting slide, and a pressing cylinder, as described in any one of claims 1 to 5. The stator lifting slide has a cutting station that moves horizontally to a position directly above the cutting die and a changing station away from it, and is used to carry the stator so that it descends into the cutting die and reaches the flat wire cutting position. The cutting drive mechanism is used to drive a rotating rod so that the moving cutter disc performs a shearing motion relative to the tooling disc.

7. The flat wire stator end cutting device according to claim 6, characterized in that, The cutting head drive mechanism is a servo drive mechanism, which causes the drive blade to cut multiple sets of radial flat wires it contains in a manner that cuts one set of radial flat wires at a time.

8. The flat wire stator end cutting device according to claim 6, characterized in that, It also includes a stator lifting slide, which includes a pair of slides and a stator lifting assembly supported on the pair of slides. The pair of slides are used to drive the stator lifting assembly to move horizontally. The stator lifting assembly is used to carry the stator and lower it into the cutting die to reach the flat wire cutting position.

9. The flat wire stator end cutting device according to claim 8, characterized in that, The stator lifting assembly includes a top plate and a set of guide columns and a lifting drive assembly arranged on the left and right sides of the top plate, and the top plate is provided with stator positioning fixtures.

10. The flat wire stator end cutting device according to claim 9, characterized in that, The lifting drive component is a servo drive mechanism.

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