CN111916963A - Commutator copper shell and commutator production method - Google Patents

Abstract

The application discloses a commutator copper shell, which relates to the field of commutators and comprises a copper shell part, wherein the copper shell part comprises an outer side part and a bottom part; the bottom has the space including border outer lane and a plurality of welding part between a plurality of welding parts, and it has first arc wall to open between welding part and the border outer lane. This application has the effect of avoiding soldering tin to be extruded between bottom and the carbon sheet of copper shell spare.

Description

Commutator copper shell and commutator production method

Technical Field

The application relates to the field of commutators, in particular to a commutator copper shell and a commutator production method.

Background

The commutator basically comprises a commutator segment, an insulating body and a carbon segment. The commutator segment comprises a copper layer, a carbon layer and a hook portion, in the production process, a copper shell piece which is obtained through cold extrusion is adopted, the copper shell piece is subjected to turning and notching for many times to form an integral copper shell piece, then the copper shell piece and a carbon piece are welded, the carbon piece and the copper shell which are fixedly welded are placed in a die, an insulating body is formed by injecting phenolic resin, and finally the hook portion is formed by milling and hooking.

In the later application of the commutator, the bent hook parts on the commutator segments need to be wound, and in order to ensure the stable connection between the wound wires and the commutator segments, the spot welding mode is usually adopted, so that the wound wires and the outer parts of the copper shell parts are welded and fixed. However, in the spot welding process, the copper shell member is heated, and the soldering tin between the copper shell member and the carbon sheet is easily melted and extruded out from the bottom of the copper shell and the carbon sheet through heat conduction, so that the tin material appears on the outer side wall of the commutator, and the performance of the commutator is affected.

Disclosure of Invention

In order to avoid that soldering tin is extruded to the outer side wall of the commutator from between the bottom of the copper shell piece and the carbon sheet when the commutator is wound in spot welding, the first purpose of the application is to provide a copper shell of the commutator.

The application provides a commutator copper shell adopts following technical scheme:

a commutator copper shell comprises a copper shell part, wherein the copper shell part comprises an outer side part and a bottom part; the bottom has the space including border outer lane and a plurality of welding part between a plurality of welding parts, the welding part with it has first arc wall to open between the border outer lane.

By adopting the technical scheme, after the welding part at the bottom of the copper shell is brushed with the solder paste, the welding part and the carbon sheet are fixed by welding through the solder paste. When the later stage carries out spot welding on the outer wall to the outside of copper shell spare, the setting of first arc wall has the effect that reduces the connection entity between welding part and the outside, because spot welding and when being heated on the lateral wall of outside, the heat can only conduct through the entity part of copper shell spare, if separated the air, then slow of heat conduction, consequently the setting of first arc wall has thermal-insulated and the effect that reduces heat conduction speed. Simultaneously, if the soldering tin on the welding part is melted, the welding after melting still can stay to first arc wall department from the welding part in-process of extruding to the outer wall department of outside portion, has also played the effect of avoiding soldering tin to extrude carbon plate and copper shell spare.

Preferably, a heat insulation groove is formed between the welding part and the edge outer ring, and one end of the heat insulation groove is communicated with the first arc-shaped groove.

Through adopting above-mentioned technical scheme, the effect of heat-insulating groove is the same with first arc wall, all has thermal-insulated and reduces heat conduction speed's effect. Can increase the height of heat dam, will make a cell wall of heat dam can correspond the part of spot welding, like this when the spot welding, the heat is direct thermal-insulated to the air of heat dam behind the outside portion, has strengthened thermal-insulated effect.

Preferably, the welding part comprises a middle tin brushing part and an annular edge part surrounding the outer side of the middle tin brushing part, the bottom end of the middle tin brushing part is used for placing tin paste, and a tin storage groove is formed between the annular edge part and the middle tin brushing part.

By adopting the technical scheme, after the welding part at the bottom of the copper shell is brushed with the solder paste, the welding part and the carbon sheet are fixed by welding through the solder paste. At this time, part of tin may be extruded into the tin storage tank, but only a small amount of tin in the tin storage tank can be realized through adjustment of the process, namely, the tin storage tank is not filled with tin. On this basis again, when the later stage is in the outer wall to the outside portion of copper shell spare when spot welding, even the heat conduction to the tin department between carbon piece and the bottom to make tin melt, tin also can be preferentially flowed in to depositing tin bath department, thereby plays to avoid soldering tin from being extruded between the bottom of copper shell spare and the carbon piece, improves finished product quality. It should be mentioned that, during spot welding, soldering tin between copper shell spare and the carbon piece melts and is extruded from between copper shell bottom and the carbon piece, except leading to the tin material appearing on the lateral wall of commutator easily, the tin material still can extrude from the hook portion or the commutator segment of commutator, and deposit the tin groove and be annular setting and lie in the outside of middle brush tin portion, can be comprehensive prevent that the tin material from being extruded to outside the bottom and the carbon piece of copper shell spare.

Preferably, the bottom end of the middle tin brushing part is lower than the bottom end of the annular edge part in vertical height.

By adopting the technical scheme, the solder paste is required to be brushed on a plurality of welding parts, the solder paste brushing is realized by adopting machine equipment in the prior art, and the solder paste is brushed on the middle solder brushing part only by keeping the copper shell piece flat.

Preferably, the copper shell spare is provided with protruding edge in towards interior one side fixed, protruding edge in with the welding part one-to-one sets up, protruding edge in the both sides of vertical direction on flushes with the both sides of welding part on vertical direction.

Through adopting above-mentioned technical scheme, in the spot welding process, the soldering tin that is located between carbon piece and the copper shell spare still probably extrudes from hook portion along the lateral wall of the vertical direction of copper shell spare, and the setting on interior protruding edge has the effect that blocks partly soldering tin along the lateral wall rebound of the vertical direction of copper shell spare, has the effect of avoiding soldering tin to extrude from hook portion.

Preferably, a second arc-shaped groove is formed in one end, facing the inner side of the copper shell, of the welding portion, and two sides of the second arc-shaped groove in the vertical direction are flush with two sides of the welding portion in the vertical direction.

Through adopting above-mentioned technical scheme, second arc wall also has separation heat transfer's effect.

Preferably, the bottom end of the edge outer ring is provided with thread grains.

Through adopting above-mentioned technical scheme, copper shell spare need place in the mould after with the carbon piece welding and mould plastics and form insulator, insulator is the working of plastics, the working of plastics and the bottom contact of border outer lane, and the further prevention soldering tin that sets up of screw thread line passes through, avoids soldering tin to flow out to the surface of the outside portion of copper shell spare on.

Preferably, the outer side part comprises a lower ring part and an upper ring part, and the diameter of the lower ring part is larger than that of the upper ring part; the upper ring part is provided with a plurality of upper raw material parts for forming the bent hook parts, and gaps are arranged among the upper raw material parts for separation.

Through adopting above-mentioned technical scheme, copper shell spare still need put into the mould and mould plastics with carbon piece welded fastening back, at the in-process of putting into the mould with copper shell spare, equipment need exert pressure and the removal of centre gripping in order to realize the product to the lateral wall of the outside portion of copper shell spare, and the diameter of going up ring portion and lower ring portion is different, and has the drop between the two, and later stage equipment of being convenient for is got and is spacing to the location clamp of copper shell spare. Meanwhile, in subsequent processing (step S7), only the outer circle of the lower ring part needs to be turned, so that the lower ring part and the carbon sheet have the same axis, the upper ring part does not need to be cut, and burrs generated by cutting of the groove between the upper raw material parts are avoided. Meanwhile, compared with the product without the distinction of the upper ring part and the lower ring part in the prior art, the carbon plate ring has the advantages that the excircle of the lower ring part is circular and coaxial with the carbon plate, the height of an object which needs to be circular is reduced, and the process difficulty is reduced.

A second object of the present application is to provide a method of producing a commutator.

A production method of a commutator comprises the following steps:

step S1, cold extrusion: extruding the approximate shape of the copper shell;

step S2, vehicle exterior: the upper ring part and the lower ring part are obtained by turning the outer circle, so that a fall is formed between the upper ring part and the lower ring part;

step S3, punching an inner hook and a punching groove: punching an inner hook and various grooves of the copper shell;

step S4, printing solder paste: brushing tin paste on the bottom end of the copper shell;

step S5, pasting and pressing top: the carbon sheet is contacted with one end of the copper shell piece, which is brushed with the solder paste, and is extruded to remove air between the carbon sheet and the solder paste and between the solder paste and the copper shell piece, so that primary stabilizing force is formed between the copper shell piece and the carbon sheet;

step S6, welding: the carbon sheet and the copper shell piece are welded and fixed by vacuum welding;

step S7, turning the excircle of the lower ring part: cutting the excircle of the lower ring part to realize the coaxiality of the lower ring part and the carbon sheet;

step S8, injection molding of the insulation body: injection molding the insulation body through a mold;

step S9, inner hole turning, outer circle turning, inner hook punching, hook milling and hook bending: cutting off unnecessary parts through equipment, milling hooks through the equipment, and bending the milled hook parts to form hook bending parts;

step S10, finishing: and sequentially performing sand polishing, tinning, carbon surface turning and groove milling on the commutator.

Through adopting above-mentioned technical scheme, realize forming ring portion and lower ring portion on the copper shell spare through increasing step 2, because the diameter of lower ring portion is greater than the diameter of last ring portion for there is the drop between last ring portion and the lower ring portion. Copper shell spare still need put into the mould and mould plastics with carbon piece welded fastening back, at the in-process of putting into the mould with copper shell spare, equipment need exert pressure and the removal of centre gripping in order to realize the product to the lateral wall of the outside portion of copper shell spare, has the drop between the two of upper ring portion and lower ring portion, and later stage equipment of being convenient for is got and is spacing to the location clamp of copper shell spare. In subsequent step S7, only the outer circle of the lower ring portion needs to be turned, so that the lower ring portion and the carbon sheet are coaxial, and the upper ring portion does not need to be cut, thereby preventing the grooves between the upper raw material portions from generating burrs due to cutting. Meanwhile, compared with the product without the distinction of the upper ring part and the lower ring part in the prior art, the carbon plate ring has the advantages that the excircle of the lower ring part is circular and coaxial with the carbon plate, the height of an object which needs to be circular is reduced, and the process difficulty is reduced. And step S5 and step S6 are arranged, the carbon sheet and the copper shell are extruded and air is exhausted, and then the solder paste is melted through vacuum welding, so that the carbon sheet and the copper shell are welded and fixed. Compare original direct extrusion at welded in-process, this application can remain more soldering tin between the welding part of carbon piece and copper shell spare, guarantees welding stability between carbon piece and the copper shell spare.

To sum up, this application deposits because the tin liquid that the spot welding flows out through setting up the tin storage tank, and the speed that heat transfer was reduced to rethread first arc wall, heat-insulating chute and second arc wall simultaneously has avoided the commutator to appear the problem outside tin extruded copper shell spare and the carbon piece because the spot welding.

Drawings

FIG. 1 is a schematic structural view of the embodiment of the present application, looking obliquely upward after hiding thread lines;

FIG. 2 is a schematic view of the structure of the embodiment of the present application looking down obliquely;

fig. 3 is a schematic bottom view of an embodiment of the present application.

Reference numerals: 1. a copper shell member; 2. an outer side portion; 3. a bottom; 4. an outer ring of the edge; 5. welding the part; 6. a lower ring portion; 7. an upper ring portion; 8. an upper material portion; 9. a middle tin brushing part; 10. an annular rim portion; 11. a tin storage tank; 12. a first arc-shaped slot; 13. a heat insulation groove; 14. thread lines; 15. an inner convex edge; 16. a second arc-shaped groove.

Detailed Description

The embodiment of the application discloses commutator copper shell, refer to fig. 1 and fig. 2, including copper shell 1, copper shell 1 includes outside portion 2 and bottom portion 3. The bottom 3 includes a rim collar 4 and a plurality of welding portions 5 integrally connected to each other, and a gap is formed between the welding portions 5. The outer part 2 comprises a lower ring part 6 and an upper ring part 7 which are connected integrally, a plurality of upper raw material parts 8 for forming the hook parts are arranged on the upper ring part 7, and gaps are arranged among the upper raw material parts 8. The upper material portion 8 forms a hook portion of the commutator through milling and hooking.

Referring to fig. 1, the soldering portion 5 includes an intermediate solder brush portion 9 and an annular rim portion 10 surrounding the outer side of the intermediate solder brush portion 9, a solder reservoir 11 is formed between the annular rim portion 10 and the intermediate solder brush portion 9, the annular rim portion 10, and the solder reservoir 11 are all fan-shaped. The bottom end of the middle tin brushing part 9 is used for placing tin paste, and the bottom end of the middle tin brushing part 9 is lower than the bottom end of the annular edge part 10 in vertical height. In the process of welding the copper shell member 1 and the carbon sheet, the plurality of welding parts 5 are required to be brushed with the solder paste, in the conventional operation, machine equipment is generally adopted to brush the solder paste, and only the middle solder brushing part 9 is brushed with the solder paste as long as the copper shell member 1 is horizontally placed. After the bottom end of the intermediate solder brushing portion 9 is brushed with solder paste, the soldering portion 5 and the carbon sheet are fixed by vacuum soldering. At this time, a part of the tin may be squeezed into the tin storage tank 11, but by adjusting the process, it can be realized that only a small amount of tin exists in the tin storage tank 11, that is, the tin storage tank 11 is not filled with tin. On this basis again, when the later stage is in the outer wall to copper shell spare 1 outside 2, even the heat conduction to the tin department between carbon plate and the bottom 3 to make tin melt, tin also can be preferentially flowed in to depositing tin groove 11 department, thereby plays and avoids soldering tin to be extruded from between copper shell spare 1's bottom 3 and the carbon plate, improves finished product quality.

Referring to fig. 1 and 2, a first arc-shaped groove 12 is formed between the welding portion 5 and the rim outer ring 4, a heat insulation groove 13 is further formed between the welding portion 5 and the rim outer ring 4, and one end of the heat insulation groove 13 is communicated with the first arc-shaped groove 12. Wherein, the length of the heat insulation groove 13 along the vertical direction is greater than the length of the first arc-shaped groove 12 along the vertical direction, that is, the height of the heat insulation groove 13 is greater than the height of the first arc-shaped groove 12. The heat insulation groove 13 and the first arc-shaped groove 12 have the effects of heat insulation and reducing the heat conduction speed. The provision of the heat insulation slot 13 and the first arc-shaped slot 12 reduces the solid connection between the welding portion 5 and the outer side portion 2, and when the outer side wall of the outer side portion 2 is spot-welded and heated, heat can be conducted only through the solid portion of the copper shell 1, and if air is insulated, heat conduction is slow. And the arrangement of the heat insulation groove 13 can ensure that one groove wall of the heat insulation groove 13 can correspond to the spot welding part, so that when spot welding is carried out, heat directly faces the air of the heat insulation groove 13 after passing through the outer side part 2 for heat insulation, and the heat insulation effect is enhanced. Meanwhile, if the soldering tin on the welding part 5 is melted, the melted soldering tin is still remained at the first arc-shaped groove 12 in the process of extruding from the welding part 5 to the outer wall of the outer side part 2, and the effect of avoiding the soldering tin from extruding the carbon sheet and the copper shell part 1 is also achieved.

Referring to fig. 3, be provided with thread line 14 on the bottom of border outer lane 4, copper shell spare 1 need place in the mould after welding with the carbon piece and mould plastics and form insulator, insulator is the working of plastics, the working of plastics contacts with the bottom of border outer lane 4, and thread line 14's setting has increased the degree of difficulty that the tin liquid passes through, further prevention soldering tin passes through, avoid soldering tin to flow out to on the surface of copper shell spare 1's outside portion 2.

Referring to fig. 2, inward convex edges 15 corresponding to the welding portions 5 one by one are integrally connected to one inward side of the copper shell 1, and two sides of the inward convex edges 15 in the vertical direction are flush with two sides of the welding portions 5 in the vertical direction. In the spot welding process, the soldering tin between the carbon sheet and the copper shell member 1 is also likely to be extruded from the hook portion along the side wall in the vertical direction of the copper shell member 1, and the arrangement of the inner convex edge 15 has the effect of blocking a part of the soldering tin from moving upwards along the side wall in the vertical direction of the copper shell member 1, and has the effect of avoiding the soldering tin from being extruded from the hook portion.

Referring to fig. 2, a second arc-shaped groove 16 is formed in one end of the welding portion 5 facing the inside of the copper shell 1, and two sides of the second arc-shaped groove 16 in the vertical direction are flush with two sides of the welding portion 5 in the vertical direction. The provision of the second arcuate slot 16 also reduces the substantial portion of heat conduction, having the effect of blocking heat transfer.

Referring to fig. 2, the diameter of the lower ring portion 6 is greater than the diameter of the upper ring portion 7 so that there is a head between the upper ring portion 7 and the lower ring portion 6. Copper shell spare 1 still need put into the mould and mould plastics after with carbon piece welded fastening, at the in-process of putting into the mould with copper shell spare 1, equipment need exert pressure and the centre gripping is with the removal that realizes the product to the lateral wall of the outside portion 2 of copper shell spare 1, has the drop between upper ring portion 7 and the lower ring portion 6 between the two, and later stage equipment of being convenient for is got and is spacing to the location clamp of copper shell spare 1.

Meanwhile, in the subsequent processing (step S7), only the outer circle of the lower ring part 6 needs to be turned, so that the lower ring part 6 and the carbon sheet are coaxial, the upper ring part 7 does not need to be cut, and burrs generated by cutting of the grooves between the upper raw material parts 8 are avoided. Meanwhile, compared with the original product without the distinction of the lower ring part 6 and the upper ring part 7, the carbon piece-based annular carbon piece structure has the advantages that the height of an object which needs to be circular is reduced, and the process difficulty is reduced.

The concrete working condition effects are as follows:

the bottom end of the middle tin brushing part 9 is brushed with tin paste and then welded and fixed with the carbon sheet. When the lateral wall of commutator is when carrying out spot welding, the lateral wall department of the outside 2 of copper shell spare 1 is heated, because the setting of first arc wall 12, heat-insulating chute 13 and second arc wall 16 has reduced heat-conducting solid portion, increases the air and insulates against heat and reduce heat-conducting speed to reduce the speed that melts of the soldering tin between carbon plate and the copper shell spare 1. If the soldering tin between the carbon sheet and the copper shell member 1 melts, the tin liquid preferentially flows into the tin storage tank 11, so that the tin liquid is prevented from being extruded from the bottom end of the copper shell member 1 and the carbon sheet, and the tin material is prevented from appearing between the outer side wall of the commutator, the hook part or the commutator segment.

The embodiment discloses a production method of a commutator, which comprises the following steps:

step S1, cold extrusion: the general shape of the extruded copper shell 1;

step S2, vehicle exterior: the upper ring part 7 and the lower ring part 6 are obtained by turning the outer circle, so that a fall is formed between the upper ring part 7 and the lower ring part 6;

step S3, punching an inner hook and a punching groove: punching an inner hook and various grooves of the copper shell 1;

step S4, printing solder paste: brushing tin paste on the bottom end of the copper shell member 1;

step S5, pasting and pressing top: the carbon sheet is contacted with one end of the copper shell 1 brushed with the tin paste and extruded to remove air between the carbon sheet and the tin paste and air between the tin paste and the copper shell 1, so that primary stabilizing force is formed between the copper shell 1 and the carbon sheet;

step S6, welding: the carbon sheet and the copper shell member 1 are welded and fixed by vacuum welding;

step S7, turning the outer circle of the lower ring part 6: cutting the excircle of the lower ring part 6 to realize the coaxiality of the lower ring part 6 and the carbon sheet;

step S8, injection molding of the insulation body: injection molding the insulation body through a mold;

step S9, inner hole turning, outer circle turning, inner hook punching, hook milling and hook bending: cutting off unnecessary parts through equipment, milling hooks through the equipment, and bending the milled hook parts to form hook bending parts;

step S10, finishing: and sequentially performing sand polishing, tinning, carbon surface turning and groove milling on the commutator.

In the above steps, the upper ring part 7 and the lower ring part 6 are formed on the copper shell member 1 by adding the step 2, and because the diameter of the lower ring part 6 is larger than that of the upper ring part 7, a fall is formed between the upper ring part 7 and the lower ring part 6. Copper shell spare 1 still need put into the mould and mould plastics after with carbon piece welded fastening, at the in-process of putting into the mould with copper shell spare 1, equipment need exert pressure and the centre gripping is with the removal that realizes the product to the lateral wall of the outside portion 2 of copper shell spare 1, has the drop between upper ring portion 7 and the lower ring portion 6 between the two, and later stage equipment of being convenient for is got and is spacing to the location clamp of copper shell spare 1.

In the subsequent step S7, only the outer circle of the lower ring part 6 needs to be turned, so that the lower ring part 6 is coaxial with the carbon sheet, and the upper ring part 7 does not need to be cut, which prevents the grooves between the upper raw material parts 8 from generating burrs due to cutting. Meanwhile, compared with the original product without the distinction of the upper ring part 7 and the lower ring part 6, the carbon plate ring has the advantages that the excircle of the lower ring part 6 is circular and coaxial with the carbon plate, the height of an object which needs to be circular is reduced, and the process difficulty is reduced.

And step S5 and step S6 are arranged, the carbon sheet and the copper shell 1 are extruded and air is exhausted, and then the tin paste is melted through vacuum welding, so that the carbon sheet and the copper shell 1 are welded and fixed. Compare original direct extrusion at welded in-process, this application can remain more soldering tin between welding part 5 of carbon piece and copper shell spare 1, guarantees welding stability between carbon piece and the copper shell spare 1.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. A commutator copper shell comprises a copper shell part (1), wherein the copper shell part (1) comprises an outer side part (2) and a bottom part (3); the method is characterized in that: bottom (3) have the space including border outer lane (4) and a plurality of welding part (5) between a plurality of welding part (5), welding part (5) with it has first arc wall (12) to open between border outer lane (4).

2. The commutator copper shell according to claim 1, wherein: and a heat insulation groove (13) is formed between the welding part (5) and the edge outer ring (4), and one end of the heat insulation groove (13) is communicated with the first arc-shaped groove (12).

3. The commutator copper shell according to claim 1, wherein: the welding part (5) comprises a middle tin brushing part (9) and an annular edge part (10) surrounding the outer side of the middle tin brushing part (9), the bottom end of the middle tin brushing part (9) is used for placing tin paste, and a tin storage groove (11) is formed between the annular edge part (10) and the middle tin brushing part (9).

4. A commutator copper shell according to claim 3, wherein: the bottom end of the middle tin brushing part (9) is lower than the bottom end of the annular edge part (10) in vertical height.

5. The commutator copper shell according to claim 1, wherein: copper shell spare (1) one side is fixed inwards to be provided with protruding edge (15), protruding edge (15) with welding part (5) one-to-one sets up, protruding edge (15) both sides on vertical direction and the both sides of welding part (5) on vertical direction flush in the interior.

6. The commutator copper shell according to claim 1, wherein: one end of the welding part (5) facing the inner side of the copper shell part (1) is provided with a second arc-shaped groove (16), and the two sides of the second arc-shaped groove (16) in the vertical direction are flush with the two sides of the welding part (5) in the vertical direction.

7. The commutator copper shell according to claim 1, wherein: and the bottom end of the edge outer ring (4) is provided with thread grains (14).

8. The commutator copper shell according to claim 1, wherein: the outer side part (2) comprises a lower ring part (6) and an upper ring part (7), and the diameter of the lower ring part (6) is larger than that of the upper ring part (7); the upper ring part (7) is provided with a plurality of upper raw material parts (8) for molding the hook parts, and the upper raw material parts (8) are separated by gaps.

9. Method for producing a commutator according to any of claims 1-8, comprising the steps of:

step S1, cold extrusion: extruding the approximate shape of the copper shell (1);

step S2, vehicle exterior: an upper ring part (7) and a lower ring part (6) are obtained by turning the outer circle, so that a fall is formed between the upper ring part (7) and the lower ring part (6);

step S3, punching an inner hook and a punching groove: punching an inner hook and various grooves of the copper shell (1);

step S4, printing solder paste: brushing tin paste on the bottom end of the copper shell (1);

step S5, pasting and pressing top: the method comprises the following steps of (1) contacting a carbon sheet with one end of a copper shell (1) brushed with solder paste and extruding to remove air between the carbon sheet and the solder paste and air between the solder paste and the copper shell (1), so that primary stabilizing force is formed between the copper shell (1) and the carbon sheet;

step S6, welding: the carbon sheet and the copper shell piece (1) are welded and fixed by vacuum welding;

step S7, turning the outer circle of the lower ring part (6): cutting the excircle of the lower ring part (6) to realize the coaxiality of the lower ring part (6) and the carbon sheet;

step S8, injection molding of the insulation body: injection molding the insulation body through a mold;

step S9, inner hole turning, outer circle turning, inner hook punching, hook milling and hook bending: cutting off unnecessary parts through equipment, milling hooks through the equipment, and bending the milled hook parts to form hook bending parts;

step S10, finishing: and sequentially performing sand polishing, tinning, carbon surface turning and groove milling on the commutator.

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