JPH08276226A - Progressive die equipment for iron core manufacturing - Google Patents

Abstract

(57) [Summary] [Object] To provide a progressive die apparatus for producing a laminated iron core of a rotating electric machine or the like, and particularly for an iron core production capable of punching with increased coaxiality of inner and outer diameters. [Structure] In a progressive die device that punches the inner diameter and outer diameter of an iron core that is punched concentrically in different steps of the same die,
The punch and the die are arranged so that the processing standard for controlling the punching accuracy is unified to either the upper die side or the lower die side, and in particular, the inner diameter punching punch 15 is arranged on the lower die 12 side and By disposing the inner diameter punching die 17 on the die 11 side, the inner diameter is punched using the punching punch 15 as a processing standard, and the outer diameter punching punch 16 is disposed on the upper die 11 side and the outer diameter on the lower die 12 side. By arranging the punching die 18, the outer diameter is made to be punched out using the outer diameter punching die 18 as a processing standard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a progressive die apparatus for producing laminated iron cores for rotary electric machines and the like, and more particularly to a progressive die apparatus for producing iron cores capable of punching with increased coaxiality of inner and outer diameters.

[0002]

2. Description of the Related Art When manufacturing a laminated core of a rotating electric machine, for example, as shown in FIG. 4, a product processing layout such as a slot processing step I, a shaft hole or inner diameter processing step II, and an outer diameter processing step III is provided. The blank B is intermittently fed in the direction of the arrow by using a progressive die apparatus, and the blank B is subjected to punching and lamination caulking and fixing necessary for the product.

FIG. 4A shows a rotor (rotor) product layout. After the pilot hole P is punched out, the slot S _{1 in} step I, the shaft hole d _{1 in} step II, and the shaft hole d ₁ in step III are removed. The product is manufactured by sequentially punching the diameter D ₁ . FIG. 4
(B) is the product layout of the stator (stator),
After the pilot hole P is punched out, the slot S
₂ , the inner diameter d ₂ in the step II and the outer diameter D ₂ in the step III are sequentially punched to obtain a product. Further, in the case of the rotor / stator co-preparation method in which both the rotor (rotor) and the stator (stator) are manufactured in a series of steps, as shown in FIG. ₂ , slot S ₁ for the rotor in step II and shaft hole d _{1 in} step II, step III
The outer diameter D ₁ for the rotor in step IV, and the inner diameter d for the stator in step IV
_In step V, the outer diameter D ₂ for the stator is sequentially punched out to obtain a product.

A conventional progressive die apparatus for punching a blank B in the above product layout is constructed as shown in FIG. 5, for example. This progressive die apparatus is provided with an upper die 1 and a lower die 2, and on the upper die 1 side, the pilot hole P, the slots S ₁ and S ₂ and the axial hole d ₁ and / or the inner diameter d ₂ and the outer diameter D ₁ , Each punch 3, 4, 5, 6 which is a male tool for punching D ₂ is mounted, and each die 7, 8 which is a female tool which receives these punches is mounted on the lower die 2 side. There is. Although not shown in the drawing, a caulking protrusion for sequentially punching and adhering adjacent iron core plates T to each other and a weighing for separating a predetermined number of sheets are stacked, although not shown in the drawing. A punch and a die for forming holes and the like are provided.

When the blank B is supplied to the passage formed between the upper die 1 and the lower die 2, the pilot holes P are formed by the pilot punches 3 on both sides of the blank B. While the pilot pin is engaged with the hole P, the blank B is intermittently fed in the direction of the arrow at the pitch of the pilot pin hole P, and a predetermined punching process is performed by the punch and die arranged in each step, and the outer shape punching described above is performed. Iron core plate T sequentially drawn into the die 8 for
The laminated core is obtained by caulking and fixing the laminated state through the caulking projections.

[0006]

As described above, all punches which are male tools are arranged on the upper die 1 side and all dies which are female tools are arranged on the lower die 2 side. However, the conventional mold device has a problem that requires the following improvements. First, in this type of laminated core, the accuracy of the coaxiality between the inner diameter side and the outer diameter side is a very important factor in the assembly accuracy and performance of the product. It is easy to get out of order.

For example, in FIG. 4 (a), the rotor is shown in FIG. 4 (b).
When the stator is punched by, the shaft hole d ₁ or the inner diameter d ₂ is punched by the inner diameter punching punch 5 mounted on the upper die 1 in step II, and the tip of the punch 5 is arranged on the lower die 2. Since the scrap is discharged to the die 7 in a manner of being fitted into the inner diameter punching die 7, the drilling is performed at that time with reference to the axial center of the inner diameter punching punch 5. In step III, the outer diameter punching punch 6 mounted on the upper die 1 punches out the outer diameter D ₁ or the outer diameter D _2, and the tip of the punch 6 is inserted into the outer diameter punching die 8 disposed in the lower die 2. The iron core plate T is punched into the die 8 in a manner of being fitted, and the extracted iron core plates T are caulked and fixed in the die 8 in a laminated state. It becomes the standard laminated state.

In this way, the inner diameter is based on the punch mounted on the upper die 1 side, and the outer diameter is based on the die disposed on the lower die 2 side. When the punching process is performed in step 1, the assembling accuracy of the upper die 1 and the assembling accuracy of the lower die 2 and the accuracy when the upper die and the lower die are combined are overlapped with each other, resulting in a deviation in coaxiality. Further, since the upper die 1 of the above-mentioned mold device is placed on the table of the press device (not shown) and is driven in conjunction with the vertical movement of the ram, when the upper die 1 is pushed down by the pressing by the ram. If there is an eccentric load, etc., the precision of the press side is transmitted to the punch as it is, and the coaxiality is reduced. In addition, there is a mold device that punches the inner and outer diameters simultaneously in the same process to increase the coaxiality, but the mold structure is complicated and large, which increases the cost of mold manufacturing and maintenance is troublesome. Had a problem with.

Therefore, the present invention is to solve the above-mentioned problems of the prior art, and affects the coaxiality of the iron core product due to the accuracy of the die device itself and the accuracy of the press device side that drives the upper die. It is a progressive die device for manufacturing an iron core, which can easily and inexpensively provide a uniform iron core product which has been reduced in number as much as possible and whose accuracy and performance have been improved.

[0010]

In a progressive die apparatus for manufacturing an iron core according to the present invention which solves the above-mentioned problems, the inner diameter and the outer diameter of an iron core punched concentrically are punched in different steps of the same die. In the sequential feeding die device for punching, the punch and the die were arranged so that the working standard for regulating the punching precision was unified to either the upper die side or the lower die side. Further, it is more desirable to arrange the punch and die so that the inner and outer diameters are standardized on the lower die side in order to increase the coaxiality. More specifically, by disposing the inner diameter punching punch on the lower die side and the inner diameter punching die on the upper die side, the inner diameter is punched using the punching punch as the processing standard, and the outer diameter punching punch is placed on the upper die side. By disposing the die on the die side and the die on the outer die side on the lower die side, the die is punched out with the outer diameter as the machining reference. Further, in addition to the inner and outer diameters described above, it is more effective to dispose the pilot punching punch on the lower die side and the pilot punching die on the upper die side.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A progressive die apparatus for manufacturing an iron core according to the present invention will be described below in detail with reference to the embodiments shown in FIGS. The structure of this progressive die apparatus is as shown in FIG. 1 for the overall schematic configuration, and FIG. 2 and FIG. 3 for the details of the main parts and operating states. This die apparatus was also used in the description of the prior art. According to the product layout shown in FIG. 4, a laminated core such as a rotor and a stator of a rotary electric machine is manufactured. The mold device includes an upper mold 11 and a lower mold 12 as in the case of the conventional mold device, and the upper mold 11 side or the lower mold 2 side is provided with a pilot hole P and a slot S in the product layout shown in FIG.
Each punch 13, 14, 15, which is a male tool for punching ₁ , S ₂ and the axial hole d ₁ and / or the inner diameter d ₂ and the outer diameters D ₁ and D ₂ ,
16 and dies 17, 18 which are female tools for receiving these punches are mounted. However, the point that this mold device differs from that of the conventional structure described in FIG. 5 is that the processing standard of the inner and outer diameters is unified to either the upper mold 11 side or the lower mold 12 side, preferably the lower mold 12 side. As described above, the punch and die in the inner diameter punching step II are arranged upside down,
The outer diameter punching step III and the processing standard are matched.

In more detail with reference to FIGS. 2 and 3, the inner diameter punching punch 15 in step II has a height t at which the cutting edge portion at the tip is set to be larger than the plate thickness of the blank B.
The lower die 12 is protruded by an amount corresponding to the lower die 12, the lower end side is fixed to the lower die 12 side through a screw member 19, and the outer periphery of the lower end side is supported by a tubular pressing plate 20. A lower die stripper 21 is concentrically arranged around the outer periphery of the cutting edge portion of the inner diameter punching punch 15, and the lower die stripper 21 is pressed upward by a spring member 22 interposed between the lower die stripper 21 and the pressing plate 20. The lower die 12 is retained by the lower die 12 via a ring-shaped locking plate 23 attached to the outer periphery on the upper end side, and the upper surface of the lower die stripper 21 is the upper surface of the inner diameter punching punch 15. It is arranged flush. The inner diameter punching die 17 is a cylindrical body having a punching hole 24 formed in the axial center thereof and is fixed to the upper die 11 side. A passage 25 for discharging internal diameter punched scraps (scrap) is provided so as to communicate with the outside. Outer diameter punching process
In III, as in the case of the conventional mold device, an outer diameter punching punch 16 is mounted on the upper die 11 side so as to be slidable with respect to the upper die stripper 26, and an outer diameter punching punch 16 is attached on the lower die 12 side. A punching die 18 is provided.

When the iron core is punched by using the die device having the above-mentioned structure, when the upper die 11 is pushed down by the ram of the press device (not shown) in step II as shown in FIG. 3, the upper die stripper is pushed down. 26 and lower stripper 21
The blank B pressed and clamped from both the upper and lower sides by
The inner diameter portion, that is, the shaft hole d _{1 in} the case of a rotor and the inner diameter d _{2 in} the case of a stator are punched by the outer diameter punching punch 16 mounted on the punch 2, and the outer diameter punching into which the punch 16 is fitted is punched. scrap B ₁ is being incorporated vent punching holes 24 of the die 18, the scrap B ₁ represents is discharged to the outside through a passage 25 in the upper die 11. Scrap B
_If a suction means by air pressure is provided, for example, at the tip end side of the passage 25 for discharging ₁ , the discharge can be effectively performed. As described above, in the conventional die apparatus, the inner diameter, which has been punched with the upper die side as the working reference, is punched with the outer periphery of the punch on the lower die side as the working reference.

Further, in step III, the outer diameter punching punch 16 mounted on the upper die 11 punches the outer diameters D ₁ and D ₂ , and the punching holes 27 of the outer diameter punching die 18 into which the punch 16 is fitted are punched. The iron core plate T is taken out of the die, is caulked and fixed in the die 18, and is taken out to the outside as a laminated iron core product. Thus, in step III, the outer diameter is punched out using the inner circumference of the die on the lower die side as a processing reference, as in the case of a die device having a conventional structure.

Therefore, in this mold apparatus, the inner diameter, which was punched using the mold apparatus of the conventional structure with the upper die side as the working reference, is punched with the lower die side as the working reference, so that the outer diameter punching and the working reference coincide. Therefore, the lowering of the coaxiality due to the deviation of the assembling precision between the upper mold 11 and the lower mold 12 is eliminated, and the coaxiality can be improved as compared with the mold device of the conventional structure, and particularly, the lower mold 12 side is processed. When the standard is used, the coaxiality can be remarkably improved as compared with the case where the upper mold side that receives an unbalanced load from the press machine is used as the processing standard.

Next, the present invention is not limited to the above-mentioned embodiments, but various modifications can be made within the scope of the invention. For example, as shown in FIG. 4C, the present invention is also applied to the case where the rotor and the stator are manufactured by the same single progressive die, and in that case, a punch for punching and forming the shaft hole d ₁ in step II, Inner diameter d for the stator in step IV
A punch for punching ₂ may be installed on the lower die 12 side in the same manner as in the above embodiment. In that case, scrap produced by punching the inner diameter of the stator becomes a thin link shape, and therefore the above-described discharge method is used. It is necessary to devise such as providing the adsorbing means.

Further, the embodiment has been described by applying it to the rotor and the stator of the rotating electric machine, but the invention is not limited to this, and it is applied to the punching process of the iron core which requires the accuracy of the coaxiality of the inner and outer diameters such as a so-called donut shape. In addition, the die can be applied not only to a single-row progressive die but also to a plurality of rows of progressive die.

Further, in the embodiment, the punch for punching the pilot pin P is provided on the upper die, but if this punch is arranged on the lower die side and the lower die is used as a processing reference in all steps, the coaxiality is further improved. In that case, the point is to improve the accuracy by arranging the pilot pin on the lower mold side as a mold structure.

[0019]

As is apparent from the above description, the progressive die apparatus for manufacturing an iron core according to the present invention has the following advantages. Since the punch and die are arranged so that the machining standard for punching the inner and outer diameters of the iron core in a separate process is common to either the upper mold side or the lower mold side, it is possible to manufacture the mold including assembly. The dimensional accuracy can be improved and managed easily, the coaxiality of the iron core product can be improved, and the product accuracy and performance can be improved.

Further, the above-mentioned processing standard is not fixed to the upper mold side which is influenced by an unbalanced load from the upper mold pressing device side and changes in each punching operation, but is fixed to the lower mold side to perform the punching process. It is possible to manufacture a uniform iron core product with improved coaxiality.

Further, if the machining standards for all punched holes including pilot holes are provided on either the upper die side or the lower die side, preferably on the lower die side, the coaxiality can be further improved. In addition, since the direction of the processing burr is unified in one direction, post-processing becomes easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing the outline of a progressive die apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a main part of the progressive die device of FIG.

FIG. 3 is an operation explanatory view of a main part of the progressive die device of FIG.

FIG. 4 is a layout diagram of a laminated core for a rotary electric machine, which is one of the objects to be implemented by the progressive die device of the present invention.

FIG. 5 is an overall front view, partly broken, showing an outline of a progressive die device according to a conventional example.

[Explanation of symbols]

 11 Upper Die 12 Lower Die 13 Pilot Punch 14 Slot Punch 15 Inner Diameter Punching Punch 16 Outer Diameter Punching Punch 17 Inner Diameter Punching Die 18 Outer Diameter Punching Die 19 Screw Member 20 Holding Plate 21 Lower Die Stripper 22 Spring Member 23 Locking Plate 24 Inner diameter punched hole 25 Passage 26 Upper die stripper 27 Outer diameter punched hole B Blank T Iron core plate

Claims (4)

[Claims] 1. In a progressive die apparatus for punching the inner diameter and outer diameter of an iron core to be punched concentrically in separate steps of the same die, the working standard for controlling punching accuracy is the upper die side or the lower die. A progressive die device for manufacturing an iron core, characterized in that a punch and a die are arranged so as to be unified on either side. 2. The progressive die apparatus for manufacturing an iron core according to claim 1, wherein the punch and the die are arranged so that the working standard of the inner and outer diameters is unified on the lower die side. 3. An inner diameter punching punch is arranged on the lower die side, and an inner diameter punching die is arranged on the upper die side, whereby the inner diameter is punched with the punching punch as a processing standard, and the outer diameter punching punch is placed on the upper die. 3. The progressive die apparatus for manufacturing an iron core according to claim 2, wherein the outer diameter is punched out by using the outer diameter punching die as a processing standard by arranging the outer diameter punching die on the lower die side and the outer diameter punching die on the lower die side. . 4. The progressive feed for iron core manufacturing according to claim 2, wherein, in addition to the inner and outer diameters described above, a pilot punching punch is arranged on the lower die side, and a pilot punching die is arranged on the upper die side. Mold equipment.