JP2609483B2 - Iron core manufacturing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for punching an iron core from an iron core plate and stacking the iron cores to produce a laminated iron core.

[Technical background]

An apparatus for producing this type of laminated iron core is disclosed in JP-A-62-20
JP-A-9814, JP-A-63-237405 and the like. This apparatus will be described with reference to FIGS. 1 to 6 showing one embodiment of the present invention. As shown in FIG.
Punch 7 and lower die 3 for punching iron core plate 1 ′ from iron core plate 1, and swaging retaining ring 4 provided on the lower surface of lower die 3
The operation is, first, as shown in FIG.
At the position A, a strip-shaped iron core plate 1 that runs linearly intermittently
The material is removed from the iron core 1 ', and a downward caulking projection 2 is formed in the material removing portion by a punch.

Subsequently, at the position B, the material removing portion is punched by a punch 7 on the lower die 3 to obtain the iron core 1 ', and the lower die 3 has a through hole in the die. The iron core 1 'is dropped into the through hole and laminated on the previously dropped iron core 1'. At the same time, the upper and lower iron cores 1 'and 1' are overlapped with the projection 2 and the recessed portion of the upper surface of the projection 2. Are fitted together to form a laminated iron core 1 ″.

The laminated iron core 1 ″ extruded from the lower surface of the lower die 3 is press-fitted into the caulking holding ring 4, and the laminated iron core 1 ″ is held by the side pressure of the caulking holding ring 4. Below the caulking holding ring 4, there is provided a receiving base 6 which advances and retreats toward the caulking ring 4 by the cylinder 5, and this receiving base 6 is brought into contact with the lower surface of the laminated iron core 1 ″ protruding from the caulking holding ring 4. The pressing force of the cylinder 5 is applied to the laminated iron core 1 ″ through the receiving base 6.

On the other hand, the punch for forming the projections 2 is lowered deeper than usual for each required number of layers of the iron cores 1 ″ to be punched out without forming the caulking projections 2 to form a through hole, and a lower hole overlapping the iron core 1 ′ is formed. The through hole is made to correspond to the recessed portion between the iron core 1 'and the projection 2 and the recessed portion are not fitted to each other. A 1 ″ separation surface (bold line portion) is formed. This separation surface is the swaged holding ring 4
When it comes out from the inside (FIG. 3), as shown in FIG. 4, the cradle 6 is lowered by the cylinder 5 and then the take-out cylinder 8 is extended, and by the pushing plate 9, The laminated iron core 1 ″ is sent to a required position.

It should be noted that each of the iron cores 1 ′,
When the protrusion 2 of 1 'and its recessed portion are sufficiently fitted to each other and the laminated iron core 1 "is sufficiently integrated, the pedestal 6, the cylinder 5 and the like are not provided, and each laminated iron core 1" is When the separation surface has passed the lower surface of the caulking holding ring 4, it is naturally dropped on the conveyor and sent to a required position.

[Problems to be solved by the invention]

In the iron core manufacturing apparatus described above, the cutting edge of the lower die 3 wears as it is used. When the punched iron core 1'has increased wear due to abrasion and sharpness, the upper surface of the cutting edge is flat-polished to regenerate a new cutting edge. Further, when the iron core 1 ′ is punched, the inner surface of the lower die 3 is used for avoiding the side pressure outside the punched iron core 1 ′ and smoothly dropping the iron core 1 ′ into the lower die 3. Has a draft of 5 to 7 minutes which spreads downward from the blade edge to the outside. For this reason, when the cutting edge is regenerated, the inner peripheral size of the cutting edge is increased by the gradient every time the cutting edge is regenerated, and the outer size of the punched iron core 1 'is also slightly increased accordingly. Becomes

On the other hand, the caulking holding ring 4 is set to be narrower by about 5 to 10 μm on the entire peripheral surface with respect to the outer size of the iron core 1 ′. That is, the interference is 5 to 10 μ. Therefore, when the cutting edge is regenerated, for example, by 5 μm or more on the entire outer peripheral surface of the iron core 1 ′, the interference of the caulking holding ring 4 becomes almost twice as much as the optimum state.

When the interference is tight, the iron core 1 'does not move smoothly in the caulking holding ring 4, and if it is difficult to move, the iron core 1' is compressed in the thickness direction by the downward force of the punch 7 and spreads outward. At this time, the lateral pressure was applied to the holding ring 4 by caulking, and the ring 4 was sometimes cracked. Also,
Even in the lower die 3, the iron core 1 ′ cannot move smoothly and spreads outward, so that the outer edge of the iron core 1 ′ and the lower die 3
At a portion where the gap on the inner surface is small, for example, near the cutting edge, the iron core 1 ′
Cracks sometimes occurred due to the side pressure. If a crack occurs in the cutting edge, it cannot be used.

It is an object of the present invention to prevent cracks from occurring in the caulking holding ring 4 and the lower die 3 even if the outer size of the iron core 1 'is slightly increased due to the regeneration of the cutting edge under the above circumstances.

[Means for solving the problem]

In order to solve the above problem, in the iron core manufacturing apparatus according to the present invention, an iron core 1 ′ is punched by a punch 7 and a lower die 3, and the iron cores 1 ′ are stacked in the lower die 3. In the above-described known iron core manufacturing apparatus in which the iron core 1 "and the laminated iron core 1" are held by the caulking holding ring 4, the caulking holding ring 4 is configured to be expandable and contractable.

As the expandable / contractible means, it is possible to employ one in which a slit 10 extending from the outer circumference to the inner circumference is formed at a required interval around the caulking retaining ring 4, and at this time, a bolt 11 that traverses the slit 10 is provided to be operable from the outside. Can be.

Further, in the iron core manufacturing apparatus having each of the above-described configurations, a cradle 6 that advances and retreats toward the caulking holding ring 4 is provided below the caulking holding ring 4 by a cylinder 5 that maintains a required pressing force. Is the caulking retaining ring 4
It may be configured to abut on the lower surface of the laminated iron core 1 ″ protruding from the above.

[Action]

According to the present invention thus constituted, if the laminated iron core 1 ″ is manufactured by the same operation as the above-mentioned conventional example, and the outer size of the iron core 1 ′ is slightly increased by regenerating the cutting edge of the lower die 3, The increase in the side pressure on the caulking holding ring 4 due to a slight increase is absorbed and mitigated by the diameter increase due to the bending of the caulking holding ring 4 that narrows the gap between the slits 10. Therefore, the iron core 1 'hinders the inside of the caulking holding ring 4. At this time, if the bolt 11 is provided, the diameter expansion can be surely adjusted according to the degree of tightening of the bolt 10, and the above-mentioned slight increase can be more smoothly dealt with.

Also in the case where the receiving base 6 is provided, a similar action is obtained, and the receiving base 6 can apply pressure to the lower surface of the laminated iron core 1 ″, and the integrated caulking of the laminated iron core 1 ″ can be performed. Be more robust.

〔Example〕

FIG. 1 shows an example of a machining process for punching out the iron core 1 ′ from the iron core plate 1. The strip-shaped iron core plate 1 is intermittently fed at the interval strokes between AB, and when stopped, each position of A to C Various processing is performed in.

At the position of the point A, the processing of providing the caulking protrusions 2 for lamination of the two iron cores 1 'and 1' (three on the left and right sides of the line AA) is performed at the positions of the points B and C. The horseshoe-shaped iron core 1 'is punched. Since the punching at both positions B and C is performed only by reversing the direction of the iron core 1 ′ and performing the same operation,
Hereinafter, only the operation at each of the positions A and B will be described.
In addition, the formation position of the caulking protrusion 2 of the iron core plate 1 and the iron core 1 ′
The punching position is such that material is previously picked up on the iron core plate 1 by visual measurement, and the portion where the material was picked up is intermittently fed to each position A.

The formation of the caulking projection 2 at the position A is performed by lowering a punch (not shown), and the projection 2 is formed by the punches shown in FIGS.
It faces downward as shown in the figure. Each time the crimping action is required, the punching length is deepened and the punch is punched down without forming the crimping protrusion 2. That is, a dropping action is performed at a stroke interval of the number of layers to be described later.

The punching at the point B is performed by lowering the punch 7, and the iron core 1 'is punched by the lowering.
The iron core 1 'is dropped into the lower die 3 and laminated on the previously dropped iron core 1'. The sunken part on the upper surface of the part 2 is fitted and integrated. That is, the respective iron cores 1 'are laminated and integrated to form a laminated iron core 1 ".

A caulking holding ring 4 is provided on the lower surface of the lower die 3, and the caulking holding ring 4 has an inner circumference narrower by about 5 to 10 μ over the entire circumference than the hole of the lower die 3,
The iron core 1 ′ is pressed into the caulking holding ring 4 by the downward force of the punch 7, and the laminated iron core 1 ″ is supported by the side pressure of the caulking holding ring 4.
As shown in the drawing, each time the punch 7 is punched and lowered, the iron core 1 ′ is lowered in the holding ring 4 by the thickness of one sheet, and the projection 2 and the recess thereof are fitted. .

On the other hand, when the iron core 1 ′ lacking the caulking protrusion 2 is punched by the punch 7 and dropped into the lower die 3,
Since there is no projection 2 and the hole is formed, the separation surface is formed without fitting with the lower iron core 1 ′. That is, the fitting of the protrusions 2 of the iron core 1 'is not performed every required number of sheets, and the iron core 1' is not fitted.
Becomes the required number of laminated iron cores 1 "and descends in the lower die 3 and the caulking holding ring 4, and as shown in FIG. 3 and FIG. ,
Free fall is possible.

Below the caulking holding ring 4, a cradle 6 which is raised and lowered by a cylinder 5 is located. The pedestal 6 comes into contact with the lower surface of the laminated iron core 1 ″ before the laminated iron core 1 ″ can be freely dropped as described above. ″ Is a pedestal 6 as shown in FIG.
While pressing down, descend. For this reason, the pressure applied to the cylinder 5 acts upward on the laminated iron core 1 ″,
That is, a pressure (back pressure) against the downward force of the punch 7 acts, and this back pressure causes each iron core 1'in the laminated iron core 1 ",
The caulking between 1'becomes stronger.

When the laminated iron core 1 ″ passes through the caulking retaining ring 4 (FIG. 3), as shown in FIG. 4, the pedestal 6 is lowered by the cylinder 5 and then the pressing plate 9 is pushed by the cylinder 8. By moving it to the right, the laminated iron core 1 ″ is withdrawn from the receiving table 6 and sent to a required position. After sending out,
The pedestal 6 is raised by the cylinder 5 to return to the initial state of FIG. Thereafter, the same operation is repeated.

It should be noted that the fluid pressure in the cylinder 5 is set to a predetermined value when the cradle 6 is in contact with the laminated iron core 1 ″. The pressure is relieved to always obtain a stable pressure (back pressure).

The structure and operation described above are known, and the feature of the present invention resides in the structure of the caulking holding ring 4 as shown in FIGS. A slit 10 extending from the outer periphery to the inner periphery is formed on the side. The slit 10 is formed by, for example, wire electric discharge machining. Further, a bolt 11 is provided which crosses the slit 10, and the holding ring 4 is bent through the slit 10 depending on the degree of tightening of the bolt 11, and the inner diameter of the holding ring 4 expands and contracts. For this reason, when the cutting edge of the lower die 3 is worn, and when the cutting edge is regenerated, if the outer size of the punched iron core 1 'increases (changes), the degree of tightening of the bolt 11 is adjusted accordingly. Thus, the side pressure of the caulking holding ring 4 is adjusted to a value corresponding to the size change. The same applies when the lower die 3 is replaced.

〔effect〕

As described above, according to the present invention, the caulking holding ring can be expanded and contracted. Therefore, even if the inner peripheral size of the cutting edge of the lower die changes and the outer diameter of the iron core to be punched changes, the caulking holding ring corresponding to the change Side pressure can be obtained. Therefore, it is possible to prevent the occurrence of cracks in the caulking holding ring and the lower die due to a change in the outer size of the iron core.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an iron core manufacturing apparatus according to the present invention. FIG. 1 is a plan view of an iron core processing step, and FIG. 2 to FIG. A longitudinal side view showing the removal operation of the iron core,
FIG. 5 is a plan view of the caulking holding ring, and FIG. 6 is a right side view of the same. DESCRIPTION OF SYMBOLS 1 ... Iron core plate, 1 '... Iron core, 1 "... Laminated iron core, 2 ... Projection, 3 ... Lower die, 4 ... Caulking holding ring, 5 ... Cylinder, 6 ... Receiver Table, 7 ... punch, 8 ... take-out cylinder, 9 ... veneer.

Claims (4)

(57) [Claims] 1. A punch 7 for punching an iron core 1 'from an iron core plate 1, a lower die 3, and a caulking holding ring 4 provided on the lower surface of the lower die 3. The lower die 3 is On the die 3, the iron core 1 ′ is punched by the punch 7, and the inside of the die 3 becomes a through-hole, and the iron core 1 ′ is dropped into the through-hole and dropped first. At the same time, the upper and lower iron cores 1 ', 1' overlapping in the through hole are fitted together with the projections 2 and the recessed portions on the upper surfaces of the projections 2 so that they are integrally laminated. An iron core 1 "is formed, and the laminated iron core 1" is extruded from the through hole by dropping the iron core 1 'by the punch 7. The caulking holding ring 4 includes therein the lower Die 3
The laminated iron core 1 ″ extruded from the lower surface is press-fitted,
An iron core manufacturing apparatus for holding the laminated iron core 1 ″ by the side pressure of the caulking holding ring 4, wherein the caulking holding ring 4 is expandable and contractable. . 2. An apparatus for manufacturing an iron core according to claim 1, wherein a cradle 6 is provided below said caulking holding ring 4 to advance and retreat toward said caulking holding ring 4 by a cylinder 5 for maintaining a required pressing force. The receiving table 6 is in contact with the lower surface of the laminated iron core 1 ″ protruding from the caulking holding ring 4. 3. The iron core manufacturing apparatus according to claim 1 or 2, wherein slits 10 extending from the outer circumference to the inner circumference are formed at required intervals around the caulking holding ring 4, and the expansion and contraction of the slit 10 is performed. An iron core manufacturing apparatus characterized in that the caulking retaining ring 4 can be expanded and contracted. 4. An apparatus for manufacturing an iron core according to claim 3, wherein a bolt 11 traversing the slit 10 is provided on the caulking holding ring 4 so as to be operable from outside, and the caulking is performed according to the degree of tightening of the bolt 11. An apparatus for manufacturing an iron core, wherein the holding ring 4 is expanded and contracted.