阅读说明：本技术 一种薄壁汽车发电机爪极制造工艺及模具 (Thin-wall automobile generator claw pole manufacturing process and die ) 是由 刘强 孙伟 刘武 王德强 薛玉良 于 2020-12-30 设计创作，主要内容包括：本发明涉及汽车发电机爪极制造技术领域,尤其是一种薄壁汽车发电机爪极制造工艺,本发明提供了一种薄壁汽车发电机爪极制造工艺,需要对爪极冷精整件爪部进行变薄拉伸处理,爪部变薄拉伸处理是采用设有的变薄拉伸模具对爪极的爪部进行侧向挤压,避免爪部额外铣削加工,能够显著提高该类产品生产效率和工艺稳定性,减少材料损耗,达到制造过程高效节能的技术效果；本发明还提供了一种模具。(The invention relates to the technical field of automobile generator claw pole manufacturing, in particular to a thin-wall automobile generator claw pole manufacturing process, which is characterized in that thinning and stretching treatment is carried out on a claw pole cold finishing part claw part, and the thinning and stretching treatment of the claw part is that a thinning and stretching die is adopted to laterally extrude the claw part of the claw pole, so that the extra milling processing of the claw part is avoided, the production efficiency and the process stability of the product can be obviously improved, the material loss is reduced, and the technical effect of high efficiency and energy saving in the manufacturing process is achieved; the invention also provides a die.)

1. A manufacturing process of a thin-wall automobile generator claw pole comprises the following steps in sequence:

s1, blanking is carried out,

s2, heating the mixture to obtain a mixture,

s3 hot forging, and obtaining a claw pole hot forging,

s4 post-forging treatment is carried out,

s5, cold finishing the claw pole hot forging after forging treatment,

s7, cutting the claw pole cold finishing piece to obtain a claw pole finished part,

the method is characterized in that step S6 is provided in step S7, and the claw part of the claw pole cold finishing piece is subjected to thinning and stretching treatment, the claw part thinning and stretching treatment is to perform lateral extrusion on the claw part of the claw pole by using a thinning and stretching die, and the surface brightness of the claw part thinning and stretching area of the finished claw pole part is different from that of the non-thinning and stretching area, and a brightness boundary line exists.

2. The process for manufacturing the thin-walled automobile generator claw pole as claimed in claim 1, wherein the heating step is to heat the cylindrical bar stock to a forging temperature range by using a medium frequency induction heating furnace to obtain a heated bar stock, and the forging temperature range is 1150-1280 ℃.

3. The process for manufacturing the claw pole of the thin-wall automobile generator according to claim 2, wherein the hot forging is a one-step or multi-step forging of a heated bar stock by using a hot forging die to obtain the claw pole hot forging.

4. The process for manufacturing the thin-walled automobile generator claw pole according to claim 3, wherein the post-forging treatment step comprises heat treatment, surface treatment and cooling of the claw pole hot forging.

5. The manufacturing process of the thin-wall automobile generator claw pole as claimed in claim 1, wherein the claw pole hot forging claw tip wall thickness d1 is 1.5mm-2 mm.

6. The process of claim 1, wherein the wall thickness d2 of the claw tip of the claw pole cold finishing member is 1.5mm-2 mm.

7. The process of claim 1, wherein the wall thickness of the tip d3 of the thin-wall automobile generator claw is 0.5mm-1.5 mm.

8. The thin-wall automobile generator claw pole manufacturing die is characterized by comprising an upper die, a movable upper die core, a guide plate, a plurality of side pressure blocks, a movable lower die, a plurality of compression springs, a plurality of screws, an upper die base, a lower die base and a floating plate.

9. The thin-walled automobile generator claw pole manufacturing mold according to claim 8, wherein the upper mold is fixed on the upper mold base by screws, the movable upper mold core is fixed in the upper mold by screws and compression springs, the guide plate is fixed on the lower mold base by screws, the movable lower mold is connected with the lower mold base by compression springs, the side pressing block is installed in a sliding groove of the guide plate, is connected with the floating plate by the compression springs and can freely move in X, Y, Z three directions in the sliding groove, and the side pressing block and the sliding groove are respectively provided with a first inclination angle a and a second inclination angle b which are matched with each other in the X direction and the Y direction and have the same degree, so that the side pressing block can slide.

10. The thin-walled automobile generator claw pole manufacturing mold according to claim 9, wherein the first inclination angle a ranges from 3 degrees to 8 degrees, and the second inclination angle b ranges from 6 degrees to 16 degrees.

Technical Field

The invention relates to the technical field of automobile generator claw pole manufacturing, in particular to a thin-wall automobile generator claw pole manufacturing process and a thin-wall automobile generator claw pole manufacturing die.

Background

The claw pole is a core part in a rotor assembly of the lundell type alternating current generator and mainly has the function of converting an axial magnetic field generated by a magnet exciting coil in the rotor into a radial magnetic field, so that an alternating magnetic field distributed along three dimensions of a space is obtained when the rotor rotates. Because the claw pole structure is very complicated and the requirement on the size precision of key parts is high, the realization of green, high-efficiency and homogeneous production is always the bottleneck technical problem which restricts the large-scale popularization and application of the claw pole structure.

The manufacturing process technology widely used for the automobile generator claw pole in the prior art is the claw pole for the automobile generator disclosed in Chinese patent and the manufacturing process thereof (publication number CN1772413), and the patent discloses the manufacturing process of the automobile generator claw pole, which is carried out according to the steps of blanking, heating, upsetting, pre-forging, final forging, trimming, magnetic annealing, cold shaping and finish machining.

With the development of high power and light weight of the automobile alternating-current generator, the mass of the whole automobile alternating-current generator is reduced by reducing the thickness of the claw pole part and increasing the height properly, so that an optional technical scheme is provided, however, the technical scheme brings difficulty to the manufacture of the claw pole. Especially for the thin-wall claw pole with the claw tip wall thickness of less than 1.5mm, the hot forging method is very difficult to blank, and the manufacturing process can occur: the tonnage requirement of the forming equipment is increased, the consumption and waste of raw materials are increased, the service life of the die is shortened, and the requirement is met. The steps of manufacturing such thin-walled claw poles according to the prior patent technical scheme generally comprise blanking, heating, upsetting, pre-forging, finish forging, trimming, magnetic annealing, cold shaping and finish machining, wherein the finish machining needs additional milling processing on the claw part, so that the production efficiency and the service life of a die are low, and the product forming quality is unstable.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to solve the problems of unstable quality and low production efficiency of the existing thin-wall claw pole, the invention provides a manufacturing process of the thin-wall automobile generator claw pole, the step S6 is arranged in the step S7, the claw part of the claw pole cold-finished piece is subjected to thinning and stretching treatment, and the thinning and stretching treatment of the claw part is to laterally extrude the claw part of the claw pole by adopting a thinning and stretching die, so that the claw part can not be subjected to additional milling processing in the claw pole fine processing, the production efficiency and the process stability of the product can be obviously improved, the material loss is reduced, and the technical effects of high efficiency and energy saving in the manufacturing process are achieved.

A manufacturing process of a thin-wall automobile generator claw pole comprises the following steps in sequence:

s1, blanking is carried out,

s2, heating the mixture to obtain a mixture,

s3 hot forging, and obtaining a claw pole hot forging,

s4 post-forging treatment is carried out,

s5, cold finishing the claw pole hot forging after forging treatment,

s7, cutting the claw pole cold finishing piece to obtain a claw pole finished part,

and step S6 is provided after step S7, the claw part of the claw pole cold finishing piece is subjected to thinning and stretching treatment, the claw part thinning and stretching treatment is that the claw part of the claw pole is laterally pressed by a thinning and stretching die, and the surface brightness of the claw part thinning and stretching area surface of the finished claw pole part is different from that of the non-thinning and stretching area surface, and a brightness boundary line exists.

Further, the heating step is to heat the cylindrical bar stock to a forging temperature range by adopting a medium-frequency induction heating furnace to obtain a heated bar stock, wherein the forging temperature range is 1150-1280 ℃.

Further, the hot forging is to forge the heated bar stock by a hot forging die in one step or multiple steps to obtain the claw pole hot forging.

Further, the post-forging treatment step comprises the steps of carrying out heat treatment, surface treatment and cooling on the claw pole hot forging.

Further, the claw tip wall thickness d1 of the claw pole hot forging piece is 1.5mm-2 mm.

Further, the wall thickness d2 of the claw tip of the claw pole cold finishing piece is 1.5mm-2 mm.

Further, the wall thickness d3 of the tip of the thin stretching piece is 0.5mm-1.5 mm.

The thin-wall automobile generator claw pole manufacturing die comprises an upper die, a movable upper die core, a guide plate, a plurality of side pressure blocks, a movable lower die, a plurality of compression springs, a plurality of screws, an upper die base, a lower die base and a floating plate.

Further, the upper die is fixed on the upper die base through screws, the movable upper die core is fixed in the upper die through screws and compression springs, the guide plate is fixed on the lower die base through screws, the movable lower die is connected with the lower die base through compression springs, the side pressing block is installed in a sliding groove of the guide plate, the side pressing block is connected with the floating plate through the compression springs, the sliding groove can freely move along X, Y, Z in three directions, and the side pressing block and the sliding groove are respectively provided with a first inclination angle a and a second inclination angle b with the same degree of mutual matching in the X direction and the Y direction so that the side pressing block can slide.

Further, the value range of the first inclination angle a is 3-8 degrees, and the value range of the second inclination angle b is 6-16 degrees.

The invention has the beneficial effects that: the invention provides a thin-wall automobile generator claw pole manufacturing process, which is characterized in that the step S6 is arranged in the step S7, the claw part of a cold finishing claw pole piece is subjected to thinning and stretching treatment, the claw part thinning and stretching treatment is to adopt a thinning and stretching die to perform lateral extrusion on the claw part of the claw pole, the claw part is prevented from being subjected to additional milling, the production efficiency and the process stability of products can be obviously improved, the material loss is reduced, and the technical effects of high efficiency and energy saving in the manufacturing process are achieved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a claw pole ironing die,

figure 2 is a schematic view of the structure of the guide plate,

FIG. 3 is a schematic structural diagram of a side pressing block,

fig. 4 is a structural schematic diagram of the claw pole tip wall thickness.

In the figure:

01. the device comprises an upper die, 02, a movable upper die core, 03, a guide plate, 04, a plurality of side pressure blocks, 05, a movable lower die, 07, a compression spring, 08, an upper die holder, 09, a lower die holder and 10, a floating plate.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 4, the structure of the claw tip of the claw pole hot forging is adjusted, the thickness of the claw tip of the hot forging is artificially gradually increased to the claw tip at a position 10mm away from the uppermost surface of the claw pole claw part, so that the wall thickness of the claw tip of the hot forging is increased to 2mm, the technical difficulty in hot forging is reduced, and then a claw tip thinning and stretching process is added after the claw pole is subjected to cold finishing, namely, a thinning and stretching die is adopted on a cold forging machine to extrude the redundant metal at the position to other positions of the claw part, so that the wall thickness of the claw tip is reduced to meet the size requirement required by a drawing.

Example 1

The automobile generator claw pole is made of low-carbon steel, the wall thickness of a claw tip is 0.6mm, and the specific manufacturing process comprises the following steps:

and S1, blanking, and shearing the claw pole raw material into a cylindrical bar by a shearing machine according to the quality requirement of the claw pole finished product and in combination with the volume invariance principle.

And S2, heating the cylindrical bar in the step S1 to a forging temperature range of 1150-1280 ℃ by adopting an intermediate frequency induction heating furnace to obtain a heated bar.

And S3, performing hot forging, namely performing multi-step forging on the heated bar stock, and sequentially performing pre-forging, finish forging and edge cutting to obtain the claw pole hot forging, wherein the claw tip wall thickness of the claw pole hot forging is more than 1.5mm, and preferably 2 mm.

And S4, performing post-forging treatment, namely sequentially performing heat treatment, surface shot blasting and cooling on the claw pole hot forging in the step S3, removing oxide skin on the surface of the hot forging, and improving the magnetic conductivity of the claw pole hot forging.

And S5, cold finishing the whole surface of the claw part of the claw pole hot forging piece subjected to the step S4, so that the dimensional accuracy of the claw part of the claw pole is improved, and the claw pole cold finished piece is obtained.

And S6, thinning and stretching the claw part of the claw pole cold finishing piece by adopting a thinning and stretching die, thinning and stretching the claw tip wall of the claw pole to 0.6mm to obtain a claw pole thinned and stretched piece, wherein the claw part of the claw pole thinned and stretched piece is not subjected to cutting processing. The thinning and stretching die comprises an upper die 01, a movable upper die core 02, a guide plate 03, a plurality of side pressure blocks 04, a movable lower die 05, a plurality of compression springs 07, a plurality of screws, an upper die base 08, a lower die base 09 and a floating plate. An upper die 01 is fixed on an upper die base 08 through screws, a movable upper die core 02 is fixed in the upper die through a plurality of screws and compression springs, a guide plate 03 is fixed on a lower die base 09 through screws, a movable lower die 05 is connected with the lower die base 09 through the compression springs 07, a 04 side pressure block is installed in a sliding groove of the guide plate 03 and is connected with a floating plate through the compression springs 07, the side pressure block can freely move in X, Y, Z three directions in the sliding groove, and the side pressure block 04 and the sliding groove are respectively provided with inclined angles a and b which are matched with each other and have the same degree in the X direction and the Y direction so that the 04 side pressure block can slide. Wherein the first angle of inclination a is 5 deg. and the second angle of inclination b is 8 deg..

And S7, cutting, namely, cutting the surfaces of the claw parts, and only cutting the surfaces except the claw parts needing to be cut to improve the surface roughness and the precision.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.