阅读说明：本技术 一种成型定转子铁芯的方法 (Method for forming stator and rotor iron cores ) 是由 邹功成 周艳文 王浩 黄国军 张红军 马凯雄 文辉 雷小友 杨丹丹 邹春盖 于 2019-12-09 设计创作，主要内容包括：本发明涉及模具设备技术领域,特别地涉及一种成型定转子铁芯的方法。本发明提供的成型定转子铁芯的方法,包括备料、铆接以及加热成型；将铁芯置入模外加热装置加热至成型铁芯。采用模外加热铁芯,可有效地解决模具内部空间有限问题,进而使得模具可以采用大回转结构,使得钢片整体的厚薄冲压更加趋近均匀,进而有效地避免因硅钢片料厚偏差导致的噪音问题,转子和定子的接触导致的旋转不良问题,同时还从根本上解决了铁芯质量分布不均所引起的其他问题,进而生产难易度降低,大幅提高生产效率；同时由于将加热装置设置模具外部,使得模具内部空间充分地、无干涉地发挥冲压功能,进而可以实现复杂形状产品生产。(The invention relates to the technical field of mold equipment, in particular to a method for molding a stator and rotor iron core. The invention provides a method for forming a stator and rotor iron core, which comprises the steps of material preparation, riveting and heating forming; and placing the iron core into an external mold heating device to heat the iron core until the iron core is formed. The iron core is heated outside the die, so that the problem that the internal space of the die is limited can be effectively solved, the die can adopt a large rotary structure, the thickness of the whole steel sheet is punched more uniformly, the problems of noise caused by material thickness deviation of a silicon steel sheet and poor rotation caused by contact of a rotor and a stator are effectively avoided, other problems caused by uneven quality distribution of the iron core are fundamentally solved, the difficulty of production is reduced, and the production efficiency is greatly improved; meanwhile, the heating device is arranged outside the die, so that the inner space of the die can fully play a stamping function without interference, and further the production of products with complex shapes can be realized.)

1. A method of forming a stator-rotor core, comprising:

preparing materials: placing the steel coil into a stamping die to be stamped into a steel sheet with a preset shape;

riveting: correspondingly riveting the steel sheets to the iron core with the required height;

heating and forming: and placing the iron core into an external mold heating device to heat the iron core until the iron core is molded.

2. The method for forming the stator-rotor core according to claim 1, wherein the material preparation step further comprises punching at least two wastes to be punched out of the steel sheet into a riveting point area in a recoil manner, wherein the riveting point area is provided with a groove and a protrusion, and the groove and the protrusion are respectively arranged on two corresponding sides of the steel sheet; the bulges of the adjacent steel sheets are matched with the grooves.

3. The method of forming a stator-rotor core according to claim 2 wherein the projections and the recesses are in an interference fit.

4. The method for forming a stator-rotor core according to claim 2, wherein two scraps of the steel sheet to be punched are punched as a rivet point area by a back-flushing method.

5. The method of forming a stator-rotor core according to claim 2, further comprising a step of punching out scraps, the step of riveting the steel sheets correspondingly to a core of a desired height, and the step of punching out scraps forming a riveting point region of the core.

6. The method of forming a stator-rotor core according to claim 5, wherein the core provided with the rivet point region is placed on an oil hydraulic press by an automated device, and the rivet point region is punched out by the oil hydraulic press to obtain a clinch-point-free riveted core.

7. The method of forming a stator-rotor core according to claim 6, wherein the step of punching away the scraps further comprises a step of positioning, wherein a positioning device is provided on the oil press, and the automatic device positions the core provided with the rivet point region on the positioning device.

8. The method of forming a stator-rotor core according to claim 7, wherein the core provided with the rivet point region is positioned on the positioning device by using a positioning member after the core is placed on the positioning device.

9. The method of molding a stator-rotor core according to claim 1, wherein the heating device is a high-frequency heating device.

10. The method of forming a stator-rotor core according to claim 1 wherein said coil of steel is surface coated with a coating material.

Technical Field

The invention relates to the technical field of mold equipment, in particular to a method for molding a stator and rotor iron core.

Background

At present, in the motor industry at home and abroad, the traditional production of riveting points (the riveting of the points leads to large volume and low performance of a motor) is developed towards the direction of non-point iron cores so as to reduce the magnetic loss of the iron cores, thereby improving the performance of the motor and further improving the competitiveness of products.

Referring to fig. 1 to 3, in the prior art, patent CN109940090A provides a technical method of gluing mold, which changes the traditional button riveting structure or welding structure into a coating gluing structure, and heats the iron core with coating material in the mold, and automatically completes the gluing process in the mold to complete the iron core with required height (see patent CN 109940090A). The technology has the defects that a heating device is arranged in the die, and the parameters of the female die and the punch are difficult to set and the production efficiency is low because the female die and the punch continuously rise along with the heat accumulation temperature in the production; because the position space in the die is limited, the die cannot adopt a large rotary structure, the problem of noise caused by the thickness deviation of silicon steel sheets, the problem of poor rotation caused by the contact of a rotor and a stator and other quality problems cannot be solved; the production of products with complex shapes cannot be realized due to the limitation of the locking ring structure.

A traditional buckling point folding and riveting structure or a welding structure is changed into a coating layer gluing and folding structure, the material is locally sprayed with glue at the bottom of a silicon steel sheet through a glue spraying device in a stamping and feeding process, blanking of punching sheets is carried out in a stamping and blanking process, and an iron core is heated through an electromagnetic induction heating technology in a laminating process, so that the punching sheets are bonded. The technology has the defects that a glue spraying device needs to be installed in a die, punching oil is easy to mix with glue in the punching production, the viscosity of the glue is difficult to maintain, special glue needs to be developed, the production efficiency is low, and mass production cannot be realized at present; because of the position space is limited in the mould, the mould can't adopt big revolution mechanic, because of the noise problem that the thick deviation of silicon steel sheet material leads to, the poor problem of rotation that the contact of rotor and stator leads to has other problems on the quality to solve, for example the mould can't adopt simultaneously top jar structure to realize production.

The laser welding point replaces the traditional buckling point, and the laser equipment is linked with the punch press and the die, so that the punching sheet is subjected to laser welding, and the effect of automatically forming the iron core in the die is achieved. The technology has the defects that laser welding equipment needs to be installed in the die, the requirements on welding spots and accuracy control of the welding equipment are high, and the production efficiency is low; because the position space in the die is limited, the die cannot adopt a large rotary structure, the problem of noise caused by the thickness deviation of silicon steel sheets, the problem of poor rotation caused by the contact of a rotor and a stator and other quality problems cannot be solved; the production of products with complex shapes cannot be realized.

Disclosure of Invention

The invention provides a method for molding a stator-rotor iron core, which can effectively solve the technical problems.

The invention provides a method for forming a stator and rotor iron core, which comprises the steps of material preparation, riveting and heating forming; preparing materials: placing the steel coil into a stamping die to be stamped into a steel sheet with a preset shape; riveting: correspondingly riveting the steel sheets to the iron core with the required height; heating and forming: and placing the iron core into an external mold heating device to heat the iron core until the iron core is molded.

In one embodiment, the material preparation step further includes stamping at least two waste materials to be punched out of the steel sheet into riveting point areas in a backflushing mode, wherein the riveting point areas are provided with grooves and protrusions, and the grooves and the protrusions are respectively arranged on two corresponding sides of the steel sheet; the bulges of the adjacent steel sheets are matched with the grooves.

In one embodiment, the protrusion and the groove are an interference fit.

In one embodiment, two wastes of the steel sheet to be punched are punched into the riveting point area by a back-flushing method.

In one embodiment, the method for forming the stator and rotor cores further comprises a scrap punching step of riveting the steel sheets correspondingly to the cores with required heights and punching the scrap forming the riveting point areas of the cores.

In one embodiment, the iron core provided with the riveting point area is placed on an oil pressure punching machine by using an automatic device, and the riveting point area is punched by using the oil pressure punching machine, so that the iron core riveted without the buckling point is obtained.

In one embodiment, the step of flushing away the waste further comprises a positioning step, a positioning device is arranged on the oil pressure punching machine, and the automatic device places the iron core provided with the riveting point area on the positioning device to complete positioning.

In one embodiment, after the iron core provided with the rivet point area is placed on the positioning device, the iron core is positioned on the positioning device by using a positioning component.

In one embodiment, the heating device is a high frequency heating device.

In one embodiment, the steel coil is provided with a coating material on the surface.

Compared with the prior art, the method for forming the stator and rotor iron cores has the following beneficial effects:

the invention provides a method for forming a stator and rotor iron core, which comprises the steps of material preparation, riveting and heating forming; placing the steel coil into a stamping die to be stamped into a steel sheet with a preset shape; correspondingly riveting the steel sheets to the iron core with the required height; and placing the iron core into an external mold heating device to heat the iron core until the iron core is molded. The iron core is heated outside the die, so that the problem that the internal space of the die is limited can be effectively solved, the die can adopt a large rotary structure, the thickness of the whole steel sheet is punched more uniformly, the problems of noise caused by material thickness deviation of a silicon steel sheet and poor rotation caused by contact of a rotor and a stator are effectively avoided, other problems caused by uneven quality distribution of the iron core are fundamentally solved, the difficulty of production is reduced, and the production efficiency is greatly improved; the heating device is arranged outside the die, and the top cylinder system can be arranged inside the die and can better bear steel sheets, so that the gap between iron core steel sheets is reduced, the riveting strength of a product is improved, the phenomenon of poor verticality of an iron core is effectively prevented, and the parallelism of the iron core is improved; and a safety device for protecting the iron core can be arranged in the die, so that the die is prevented from being damaged. Meanwhile, the heating device is arranged outside the die, so that the inner space of the die can fully play a stamping function without interference, and further the production of products with complex shapes can be realized.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.

FIG. 1 is a flow chart of a first prior art method of staking an iron core;

FIG. 2 is a flow chart of a second prior art method of riveting an iron core;

FIG. 3 is a flow chart of a third prior art method of riveting an iron core;

FIG. 4 is a flow chart of a method of forming a stator-rotor core of an embodiment of the present invention;

fig. 5 is a schematic structural view of an iron core to be subjected to scrap punching in the method of molding a stator-rotor iron core according to the embodiment of the present invention;

fig. 6 is a schematic structural view of a state of positioning of core punching scraps in a method of molding a stator-rotor core according to an embodiment of the present invention at a first viewing angle;

fig. 7 is a schematic structural view of the positioning state of the core punching scrap in the method of molding a stator-rotor core according to the embodiment of the present invention at a second perspective.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Reference numerals:

10-an iron core; 11-steel sheet; 111-rivet point area; 13-positioning means.

Detailed Description

The invention will be further explained with reference to the drawings.

Referring to fig. 4 to 7, the method for forming a stator-rotor core according to the present invention includes preparing materials, riveting, and heat forming; preparing materials: placing the steel coil into a stamping die to be stamped into a steel sheet 11 with a preset shape; riveting: correspondingly riveting the steel sheets 11 to the iron core 10 with the required height; heating and forming: and placing the iron core 10 into an external mold heating device to heat until the iron core 10 is formed.

The invention provides a method for forming a stator and rotor iron core, which comprises the steps of material preparation, riveting and heating forming; placing the steel coil into a stamping die to be stamped into a steel sheet 11 with a preset shape; correspondingly riveting the steel sheets 11 to the iron core 10 with the required height; and placing the iron core 10 into an external mold heating device to heat until the iron core 10 is formed. The iron core 10 is heated outside the die, so that the problem of limited internal space of the die can be effectively solved, the die can adopt a large rotary structure, the thickness of the whole steel sheet 11 is more uniform, the noise problem caused by material thickness deviation of the silicon steel sheet 11 and the problem of poor rotation caused by contact of a rotor and a stator are effectively avoided, other problems caused by uneven mass distribution of the iron core 10 are fundamentally solved, the production difficulty is reduced, and the production efficiency is greatly improved; meanwhile, the heating device is arranged outside the die, so that the inner space of the die can fully play a stamping function without interference, and further the production of products with complex shapes can be realized.

It should be noted that, in the material preparation stage of the present invention, the steel coil is placed into the stamping die to be stamped into the steel sheet with the preset shape, as can be seen from fig. 7, in this embodiment, the steel sheet is stamped into the petal-shaped structure; it will be understood that the specific shape of the steel sheet is not limited herein, and in other specific embodiments, the steel sheet may be stamped into other shapes according to the needs of the user.

In one example, the material preparing step further includes stamping at least two waste materials (intermediaries and recoil blocks) to be punched out of the steel sheet 11 into a riveting point area 111 in a recoil manner, where the riveting point area 111 includes a groove and a protrusion, and the groove and the protrusion are respectively disposed on two corresponding sides of the steel sheet 11; the bulges of the adjacent steel sheets 11 are matched with the grooves. It should be noted that, in this embodiment, the scrap to be punched out of the steel sheet 11 is used as an intermediary, and is punched into the riveting point region 111 in a recoil manner, that is, the special punched fastening point is replaced, so as to complete the riveting of the iron core 10, and after the riveting is completed, the scrap is punched out, so as to form the riveting of the iron core 10 without the fastening point; a special stamping buckling point is not needed, so that the processing process is simplified, and the labor cost is saved; meanwhile, the iron core 10 of the finished product has no buckling point specially used for connection in structure, so that the structure of the iron core 10 is simpler; no special buckling point is arranged, so that a processing worker does not need to specially consider the symmetry problem of the buckling point during the design process due to the stability of rotation; the design of no knot point that this application adopted has greatly simplified processing method for processing is simpler and easier, and the iron core 10 structure is more simplified.

In one example, the protrusion has an interference fit with the recess. It should be noted that the protrusion and the groove are set to be in over-hard fit, so that the connection between the steel sheets 11 is firmer, and further, the structure of the iron core 10 is more stable.

In one example, two scraps of the steel sheet 11 to be punched are punched into the rivet point area 111 by a back-punching method. It should be noted that the number of the scraps to be punched out of the steel sheet 11 is not limited herein, and it should be understood that in other specific embodiments, the number of the scraps to be punched out of the steel sheet 11 may be set to three, four or five according to the shape of the punched steel sheet 11 and the requirement of a user.

In one example, the method for forming the stator and rotor cores further comprises a scrap punching step of riveting the steel sheets 11 correspondingly to the cores 10 with the required height, and punching the scrap forming the riveting point areas 111 of the cores 10. And punching the scraps forming the riveting point area 111 of the iron core 10 to obtain the iron core 10 with a required shape, and simultaneously punching the scraps riveted together and combined to form the riveting point area 111 of the iron core 10, so that the scraps in the riveting point area 111 preferentially exert a riveting effect, and punching the scraps after the riveting is completed to obtain the iron core 10 without the fastening point. A special stamping buckling point is not needed, so that the processing process is simplified, and the labor cost is saved; meanwhile, the finished iron core 10 has no fastening point specially used for connection in structure, so that the structure of the iron core 10 is simpler.

In one example, the iron core 10 provided with the rivet point region 111 is placed on an oil press by an automatic device, and the rivet point region 111 is punched out by the oil press to obtain the iron core 10 riveted without a snap point. Large plants in automation systems are also referred to as automation devices. Refers to a process in which a machine or apparatus automatically operates or controls according to a prescribed program or instruction without human intervention. The industrial automation mainly uses automatic equipment to replace high-risk, monotonicity and high-frequency human behaviors, such as taking hot castings, taking materials every few minutes and the like. Adopt automation equipment can improve work efficiency effectively, reduce the operational risk, promote the degree of accuracy of work.

In one example, the step of flushing the waste further includes a positioning step, a positioning device is disposed on the oil press, and the automatic device places the iron core 10 provided with the riveting point region 111 on the positioning device to complete positioning. And setting a positioning step, and placing the iron core 10 in the riveting point area 111 in the positioning device to complete positioning, so that the subsequent stamping work is more accurate, and the stamping deviation is avoided, and the rejection rate is increased.

In one example, after the iron core 10 provided with the rivet point region 111 is placed on the positioning device, the iron core 10 is positioned on the positioning device using the positioning member 13. The iron core 10 provided with the riveting point area 111 is placed behind the positioning device, and the positioning component 13 is further adopted to position the iron core 10 on the positioning device, so that the iron core 10 is further stabilized, the movement of the iron core 10 in the process of stamping waste materials is avoided, and further stamping deviation is realized.

Specifically, in this embodiment, the positioning component 13 is a pin, and it should be noted that a specific structure of the positioning component 13 is not limited herein, and it should be understood that in other specific embodiments, other positioning structures, such as a positioning pin, a positioning clamping member, and the like, may be adopted for the positioning component 13 according to specific needs of a user.

Specifically, in this embodiment, the positioning component 13 includes three pins, and it should be noted that the number of the pins is not limited herein, and it should be understood that, in other embodiments, the number of the pins may also be set to two, four, or five according to the requirement of the user.

In one example, the heating device is a high frequency heating device. It should be noted that the heating device is a high-frequency heating device, the high-frequency heating device adopts a magnetic field induction eddy current heating principle, and utilizes a magnetic field generated by a current passing coil, when magnetic lines in the magnetic field pass through a metal material, the boiler body self generates heat at a high speed, and then heats a substance, and can reach a required temperature in a short time. The high-frequency heating device is an induction heating device which has the highest heating efficiency, the fastest speed, low consumption, energy conservation and environmental protection on metal materials at present.

It should be further noted that, the specific device of the heating device is not limited herein, and it is understood that, in other specific embodiments, the heating device may be configured as a laser welding apparatus according to the needs of a user, during the implementation, the waste material may be used as an intermediary for recoil as a fastening point, after the iron core 10 with a desired thickness is obtained by riveting, an automation device is used to clamp and position the iron core 10, the intermediary (the waste material at the recoil position of the iron core 10) is removed, and further, the iron core 10 is formed by laser welding outside the mold. It is understood that the specific device of the heating device is not limited herein, and in other specific embodiments, the heating device may be implemented by other devices according to the needs of the user to perform the thermoforming process of the iron core 10.

In one example, the heating temperature is set to 220 ℃ to 250 ℃ during the heating process. Specifically, in the present embodiment, the heating temperature of the heating device is set to 230 ℃ during heating. It should be noted that the specific heating temperature of the heating device is not limited herein, and in other specific embodiments, the processing personnel can select the heating temperature suitable for the material to be heated according to the material to be heated.

In one example, the steel coil is provided with a coating material on the surface. The coating material is arranged on the surface of the steel coil, so that the iron core 10 can be automatically adhered and stacked by the steel sheet 11 material with the coating due to heating, the iron core 10 with the required height can be completed, the precision of the iron core 10 can be ensured, and the production efficiency can be improved. It should be noted that, the surface of the steel coil is not limited to be provided with the coating material, and it should be understood that, in other specific embodiments, the steel coil may also be provided as the ordinary silicon steel sheet 11 without the coating according to the requirement of the user.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.