CN102005869A - Blank pressing process used in punching rotor slot on motor stator plate and key mold thereof - Google Patents

Abstract

The invention provides a blanking stamping process for stator and rotor blades of a motor for punching rotor slots and its key mold. The stamping process steps are: ① re-punching the rotor slot, rotor shaft hole and outer circle of the stator, ② single-punching the stator slot and separating the stator and rotor piece. Its key mold is composed of upper mold part, lower mold part and guide part. The upper mold part includes rotor groove punch, shaft hole punch, keyway punch and stator outer circle die, buckle slot punch, outer mark groove punch The upper cutting edge of the head; the upper cutting edge is fixed on the upper fixing plate; the position and size of the upper cutting edge are related to the rotor slot, shaft hole, key slot and outer circle of the stator, buckle slot, and outer marking slot to be stamped. The positions and sizes are corresponding; the lower mold part includes a lower cutting edge corresponding to the upper cutting edge. The finished product can be obtained in only two steps by using the present invention, one step is reduced compared with the prior art, the stamping efficiency is improved, and the quality of the stator sheet and the rotor sheet is improved. For a certain type of motor produced in large quantities, the effect is particularly obvious.

Description

Blanking and stamping process of motor stator and rotor sheet punching rotor slot and its key mold

technical field

The invention relates to the technical field of motor manufacturing, in particular to a blanking stamping process for punching rotor slots of stator and rotor blades of motors and a key mold thereof.

Background technique

The stator and rotor are the core components of the motor. They are formed by stamping the entire sheet material with a mold, and then stacking the stator and rotor pieces respectively. The stamping of motor stator and rotor slices is an essential process. The man-hours occupied by the stamping process account for a considerable proportion of the cost of the motor. In mass production, the appropriate stamping method directly affects the production efficiency and production cost.

The stamping steps of the existing motor stator sheet and rotor sheet stamping process are as follows:

①Blanking of stator and rotor blanks: stamp out the outer circle of the stator, the inner circle of the stator (the outer circle of the rotor) and the rotor shaft hole;

② Repunching the stator slot: Positioning with the inner circle of the stator, stamping the stator slot, the stator buckle slot and the outer mark slot of the stator;

③ Repunching the rotor groove: Position the inner circle of the shaft hole, punch the rotor groove and the rotor keyway.

Using this processing technology to stamp the stator and rotor slices, the process arrangement is relatively concentrated, and the final stator and rotor slices can be obtained in three steps. However, in the production process, the stator and rotor blanks obtained by blanking in step ① are removed from the mold and scattered around the punching machine. Before punching the rotor groove, the stator and rotor blanks have to be sorted and stacked again, which increases the workload. It often happens that the stator and rotor blanks are not placed in the same stamping direction, resulting in inconsistent burr directions after the subsequent stamping of the groove shape. The lamination factor has an impact, which ultimately affects the efficiency and performance of the motor.

Contents of the invention

The purpose of the present invention is to provide a blanking stamping process for stamping rotor slots of motor stator and rotor with less stamping process and high stamping efficiency and its key mold.

For realizing above-mentioned object, the technical scheme that the present invention takes is:

A blanking stamping process for rotor slot punching of motor stator and rotor, comprising the following steps:

① Repunching the rotor slot, rotor shaft hole and stator outer circle: stamping the rotor slot, rotor keyway and rotor shaft hole, and stamping the stator outer circle, stator buckle slot and stator outer marking slot at the same time;

②Single-punch stator slot and separate stator and rotor slices: positioning with rotor shaft hole and rotor keyway, single-punch stator slot and separate stator slice and rotor slice.

In step ①, the stamped rotor slot notch exceeds the outer circle of the rotor after cutting by 0.1 mm to 0.2 mm in the radial direction, and the rotor notch position will be processed in the process of cutting the air gap of the outer circle of the rotor core in the future.

In order to cooperate with the implementation of the blanking and stamping process of the stator and rotor blades of the motor described in the present invention, the corresponding key molds are designed and manufactured.

A key mold for realizing the blanking and stamping process of the above-mentioned motor stator and rotor sheet punching rotor groove, which is composed of an upper mold part, a lower mold part and a guide part. The upper mold part includes an upper blade provided with a rotor shaft hole punch and a stator outer circle die The upper cutting edge is fixed on the upper fixing plate, and it is characterized in that: the upper cutting edge also includes rotor slot punches, rotor keyway punches, stator buckle slot punches, and stator outer marking slot punches; The position and size of the cutting edge layout correspond to the position and size of the rotor slot, rotor shaft hole, rotor keyway, stator outer circle, stator buckle slot, and stator outer marking groove to be stamped; the lower die part includes the upper cutting edge corresponding lower edge.

For the rotor slot punch, the size of the notch exceeds the corresponding size of the outer circle of the rotor after cutting by 0.1 mm to 0.2 mm in the radial direction.

The rotor slot punch is fixed on the upper fixing plate by means of interference fit, cold expansion alloy fixing or bonding.

The rotor keyway punch is fixedly connected with the rotor shaft hole punch in the form of an insert.

The stator buckle groove punch is inlaid on the stator outer circular die in the form of an insert, the lower half of the insert insert end is fixedly connected with the stator outer circle die, and at the same time, the upper half of the insert end is fixedly connected with the upper fixing plate .

The stator outer mark slot punch is assembled with a stator buckle slot punch, embedded in the outer circle die of the stator in the form of an insert, and the lower half of the insert insert end is fixedly connected with the outer circle die of the stator , while the upper half of the embedded end is fixedly connected with the upper fixing plate.

The above motor stator and rotor piece punching rotor groove blanking stamping process and its key molds provided by the present invention combine the functions of stamping rotor slots, rotor keyways, stator buckle slots, and stator outer marking grooves with stamping rotor shaft holes and stator outer circles. The function is set on a set of molds, and the finished product can be obtained in only two steps, which not only reduces one step compared with the existing technology, but also saves the time for re-sorting and stacking the stator and rotor blanks, improves stamping efficiency, and improves The quality of the stator and rotor slices. The effect is especially noticeable in mass production.

Description of drawings

Fig. 1: the structural representation of key mold of the present invention;

Fig. 2: the top view of the lower mold of the key mold of the present invention.

In the figure: 1- stator outer circle die, 1'- stator outer circle punch edge, 2- stator buckle groove punch, 2'- stator buckle groove lower die cutting edge, 3- stator outer marking groove punch Head, 3'-the lower die edge of the stator outer marking groove, 4-the rotor slot punch, 4'-the rotor slot lower die edge, 5-the rotor shaft hole punch, 5'-the rotor shaft hole die edge, 6- Rotor keyway punch, 6'-rotor keyway lower die cutting edge, 7-upper fixing plate.

Detailed ways

The blanking and stamping process of the motor stator and rotor sheet punching rotor groove provided by the present invention comprises the following steps:

① Re-punching the rotor slot, rotor shaft hole and stator outer circle: on the punching machine, punch the rotor slot, rotor keyway and rotor shaft hole, and simultaneously punch the stator outer circle, stator buckle slot and stator outer marking groove to obtain the stator and rotor blank;

②Single punch stator slot and separate stator and rotor slices: On the single slot machine, position the stator and rotor blanks with the rotor shaft hole and rotor keyway, punch the stator slot and separate the stator and rotor slices to obtain the stator slices and rotor slices.

After lamination, the rotor pieces of the motor will form a cast aluminum rotor. When casting aluminum, because the slot of the rotor is open, it is necessary to use a middle mold to cover the outside of the iron core. Due to the long-term work at high temperature, after a period of use, the aluminum will leak The phenomenon is very serious, and even thin strips and broken strips appear. This kind of situation will affect the performance of the motor in the slightest, fail to meet the design requirements, and be scrapped in severe cases, resulting in serious waste.

Using the above motor stator and rotor piece punching rotor groove blanking stamping process provided by the present invention, in step ①, the punched rotor groove notch exceeds the outer circle of the rotor after cutting by 0.1 mm to 0.2 mm in the radial direction, so that in step ② After the stator slot is single punched and the stator and rotor pieces are separated, the opening of the rotor slot is closed, which is of great benefit to the subsequent cast aluminum, which can largely avoid the phenomenon of aluminum leakage and improve the effect of cast aluminum . In addition, the notch of the rotor slot can also be used to observe whether there are thin strips or broken strips of cast aluminum when machining the outer circle of the rotor core to cut the air gap.

The above motor stator and rotor sheet punching rotor groove blanking stamping process provided by the present invention reduces one stamping step, correspondingly reduces the occupation time of the large punch press, reduces the number of dies of the large punch press, reduces intermediate links, and has small cumulative errors, which is convenient Production leveling and management of factories. In addition, the reduction of stamping steps shortens the production cycle of stator and rotor pieces, reduces the number of handling during processing, saves the time for re-sorting and stacking stator and rotor blanks, and reduces labor intensity. Since these two steps are stamped sequentially, there will be no problem of inconsistent stamping burrs affecting the stacking coefficient of the motor core, and there is no need for special sorting and stacking, which improves the stamping efficiency.

In order to cooperate with the implementation of the blanking and stamping process of the stator and rotor blades of the motor described in the present invention, the corresponding key molds are designed and manufactured.

As shown in Figure 1 and Figure 2, in the embodiment of the key mold provided by the present invention to realize the blanking and stamping process of the stator and rotor blades of the motor mentioned above, the mold includes an upper mold part, a lower mold part and a guide part, wherein :

The upper mold part includes an upper cutting edge, which is fixed on the upper fixing plate 7, and the upper cutting edge includes the rotor slot punch 4, the rotor shaft hole punch 5, the rotor keyway punch 6, the stator outer circle die 1, and the stator buckle Slot punch 2, stator outer mark slot punch 3. The rotor slot punch 4 is fixed on the upper fixing plate 7 by means of interference fit, cold expansion alloy fixing or bonding (the fixing method of cold expansion alloy is shown in FIG. 1 ). The size of the notch of the rotor slot punch 4 exceeds the outer circle of the rotor after cutting in the radial direction by 0.1 mm to 0.2 mm. The rotor keyway punch 6 is fixedly connected with the rotor shaft hole punch 5 in the form of an insert. The eight stator buckle slot punches 2 are inlaid on the stator outer circle die 1 in the form of inserts, the lower half of the insert insert end is fixedly connected with the stator outer circle die 1, and the upper half of the insert end is connected with the upper fixing plate at the same time 7 fixed connections. A stator outer marking groove punch 3, which is assembled with a stator buckle slot punch, is inlaid on the stator outer circle die 1 in the form of an insert, and the lower half of the insert insertion end is fixed with the stator outer circle die 1 Connection, while the upper half of the embedded end is fixedly connected with the upper fixing plate 7.

The position and size of the upper cutting edge of the upper die part correspond to the position and size of the rotor slot, rotor shaft hole, rotor keyway, stator outer circle, stator buckle slot, and stator outer marking slot to be stamped.

The lower die part includes the lower cutting edge corresponding to the upper cutting edge, that is, the cutting edge of the lower die of the rotor slot 4', the cutting edge of the die of the rotor shaft hole 5', the cutting edge of the lower die of the rotor keyway 6' and the cutting edge of the outer circular punch of the stator 1', the cutting edge of the lower mold of the stator buckle slot 2', the cutting edge of the lower mold of the outer marking groove of the stator 3'.

The stator outer circle die and the stator outer circle punch are block structures, which are convenient for processing and save materials.

The process of using the key molds for realizing the blanking and stamping process of the stator and rotor blades of the motor provided by the present invention is as follows:

Prepare sheet material (silicon steel sheet) according to the required stator sheet and rotor sheet, and select a suitable large punching machine, which will be equipped with rotor slot punch 4, rotor shaft hole punch 5, rotor keyway punch 6 and stator outer circle die 1, Stator buckle groove punch 2, the upper mold part of the stator outer marking groove punch 3, and the cutting edge 4' of the lower mold of the rotor slot, the cutting edge of the die of the rotor shaft hole 5', the cutting edge of the lower mold of the rotor keyway 6' and The mold of the lower mold part of the outer circular punch edge 1' of the stator, the lower mold edge 2' of the stator buckle slot, and the lower mold edge 3' of the stator outer marking groove are installed on the punching machine, and the punching machine and the mold are adjusted properly. Start the punching machine, place the blank in the mold and position it correctly, punch a piece of blank with one stroke of the punching machine, and get the punched out rotor slot, inner circle of rotor shaft hole, rotor keyway, outer circle of stator, stator buckle slot, Stator and rotor blanks for marking slots outside the stator.

The key mold provided by the present invention to realize the blanking and stamping process of the stator and rotor blades of the motor mentioned above integrates and designs the mold functions of different processes in the prior art on a pair of molds, the inner circle of the rotor shaft hole, the rotor keyway and the rotor groove It is punched out on the mold at one time, the consistency of the rotor slices is good, and the groove shape is neat after lamination; after the rotor shaft hole and the rotor keyway are stamped, they are only used once when stamping the stator groove to separate the stator and rotor slices, instead of multiple processes The repeated use improves the quality of the stator and rotor slices.

What has been described above are only preferred examples of the present invention. It should be pointed out that for those skilled in the art, under the technical inspiration provided by the present invention, other equivalent modifications and improvements can also be made, which should also be regarded as the protection scope of the present invention.

Claims (8)

1. electric machine rotor sheet red switch pilot trench blanking Sheet Metal Forming Technology is characterized in that it may further comprise the steps:

1. answer red switch pilot trench, rotor shaft hatch and stator cylindrical: stamping rotor groove, rotor keyway and rotor shaft hatch, the stator of punching press simultaneously cylindrical, stator cramp groove and stator external labeling groove;

2. the one-shot stator slot is held concurrently and separated the rotor sheet: with rotor shaft hatch and rotor keyway location, the one-shot stator slot is held concurrently and is separated stator piece and rotor sheet.

2. electric machine rotor sheet red switch pilot trench blanking Sheet Metal Forming Technology according to claim 1, it is characterized in that: step 1. in, the rotor notch of institute's punching press radially exceeds cutting back rotor cylindrical 0.1 mm～0.2 mm in the future, and handle when processing rotor iron core cylindrical is cut the air gap operation afterwards rotor oral area position.

3. realize the crucial mould of electric machine rotor sheet red switch pilot trench blanking Sheet Metal Forming Technology according to claim 1 for one kind, form by part of the upper die, part of the lower die and targeting part, the part of the upper die comprises the last cutting edge that is provided with rotor shaft hatch punch and the outer cupping tool of stator, last cutting edge is installed on the upper mounted plate, it is characterized in that: the described cutting edge of going up also comprises rotor drift, rotor keyway drift and stator cramp groove drift, stator external labeling groove drift; The position and the size of rotor, rotor shaft hatch, rotor keyway and the stator cylindrical of the position that last cutting edge is laid, size and required punching press, stator cramp groove, stator external labeling groove are corresponding; The part of the lower die comprises the following cutting edge corresponding with last cutting edge.

4. the crucial mould of the above-mentioned electric machine rotor sheet of realization according to claim 3 red switch pilot trench blanking Sheet Metal Forming Technology, it is characterized in that: described rotor drift, its notch size radially exceed cutting back rotor cylindrical correspondingly-sized 0.1 mm～0.2 mm in the future.

5. according to the crucial mould of claim 3 or the above-mentioned electric machine rotor sheet of 4 described realizations red switch pilot trench blanking Sheet Metal Forming Technology, it is characterized in that: described rotor drift adopts interference fit, expanded metal is fixed or bonding mode is installed on the upper mounted plate.

6. the crucial mould of the above-mentioned electric machine rotor sheet of realization according to claim 3 red switch pilot trench blanking Sheet Metal Forming Technology, it is characterized in that: described rotor keyway drift is fixedlyed connected with the rotor shaft hatch punch with the inserts form.

7. the crucial mould of the above-mentioned electric machine rotor sheet of realization according to claim 3 red switch pilot trench blanking Sheet Metal Forming Technology, it is characterized in that: described stator cramp groove drift is embedded on the outer cupping tool of stator with the inserts form, inserts built-in end the latter half is fixedlyed connected with the outer cupping tool of stator, and built-in end the first half is fixedlyed connected with upper mounted plate simultaneously.

8. the crucial mould of the above-mentioned electric machine rotor sheet of realization according to claim 3 red switch pilot trench blanking Sheet Metal Forming Technology, it is characterized in that: described stator external labeling groove drift, gather together with a stator cramp groove drift, be embedded on the outer cupping tool of stator with the inserts form, inserts built-in end the latter half is fixedlyed connected with the outer cupping tool of stator, and built-in end the first half is fixedlyed connected with upper mounted plate simultaneously.

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