JP4844994B2 - Molding device for manufacturing laminated core - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an apparatus for manufacturing a laminated iron core of a rotating electric machine by punching a strip-shaped thin plate with a progressive die, and is particularly applied to an apparatus for performing outer shape punching and laminated caulking while rotating a die. It is related with the metal mold | die apparatus for manufacture of a laminated iron core suitable for manufacturing efficiently a motor rotor etc. with high lamination | stacking precision.
[0002]
[Prior art]
In a progressive die for manufacturing this type of laminated iron core, as disclosed in, for example, Japanese Patent Publication No. 61-23053, concave and convex portions are formed on the upper and lower surfaces of each iron core plate as caulking and coupling means. Locking projections are provided, and each core plate stacked and sequentially pulled out into the lower die with an external punch is fitted and locked to the upper and lower adjacent protrusions and recesses, and a predetermined number of sheets are integrated. It has a laminated iron core that is bonded to.
[0003]
For example, as disclosed in Japanese Patent Publication No. Sho 61-23053, the caulking coupling means includes an inner peripheral surface of a die in a lower mold and an inner peripheral surface of a straight hole (squeeze ring) continuous therewith. On the other hand, there is a squeeze ring method in which the outer peripheral surface of each iron core plate is frictionally engaged and held in the lower mold, and the outer punching punch is applied with caulking force from above.
[0004]
As another prior art, for example, as disclosed in Japanese Patent Publication No. 55-11940, a pedestal supported by a fluid pressure device such as a cylinder so as to be lifted and lowered is provided in the lower mold. There is also a cradle system in which each iron core plate is urged upward via a base and is caulked by applying a pressing force of an outer punching punch from above.
[0005]
Furthermore, in order to correct the variation in the stacking thickness of the laminated core due to the thickness deviation of each iron core plate, and particularly in the case of a motor rotor, in order to improve the motor characteristics including rotational accuracy such as dynamic balance, Each of the punched iron core plates is stacked one by one or a plurality of predetermined number of sheets in a state where the die is rotated by a predetermined angle (for example, 90 degrees or 180 degrees) and shifted in phase.
[0006]
FIG. 1 shows a cross-sectional view of the main part of an outer shape punching and laminating caulking portion provided as a final process in a progressive die to which these conventional techniques are applied (the present invention is also one of the objects of implementation). The mold uses a squeeze ring type caulking coupling means and is piled up. The main part is composed of an upper mold 1, an outer punch 2, a stripper plate 3, a guide post 4, and a lower mold. 5, a squeeze ring 6, and a die 7.
[0007]
The squeeze ring 6 and the die 7 are rotatably supported by the lower die 5 via a bearing member 8, and are wound around a pulley 9 and a rotation control drive device 11 such as an angle indexing device (index) provided outside. The squeeze ring 6 and the die 7 are formed to have substantially the same inner diameter.
[0008]
The strip-like thin plate 12 is intermittently fed between the upper die 1 and the lower die 5, and after being subjected to caulking / bonding means and other predetermined punching processes in the previous step, is transferred to the outer shape punching and laminating caulking portion in the final step. External punching is performed by the punching punch 2 and the die 5, and the iron core plate 13 is sequentially cut out in the rotary die portion (collectively referring to the squeeze ring 6 and the die 7).
[0009]
At that time, the rotation die drive unit 11 is rotated by the rotation control drive unit 11 so that the iron core plates 13 are rotated and stacked, and the squeeze ring method is used for caulking and bonding by a predetermined number of sheets, and the laminated iron core 14 is integrally bonded. It is pushed out from the rotary die part to a carry-out passage 15 provided on the lower side of the lower mold 5 and then transferred to the outside of the mold.
[0010]
Each iron core plate 13 includes a connecting iron core plate 13A in which a locking projection a for caulking and coupling is formed, and a measuring iron core plate 13B in which a separation hole b is formed, and the connecting iron core plate 13A. When they are adjacent to each other in the vertical direction, the convex portion formed by the locking projection a of one iron core plate 13A fits into the concave portion formed by the locking projection a of the other iron core plate 13A. It is fitted and locked by coupling.
[0011]
Further, when the connecting iron core plate 13A and the measuring iron core plate 13B are adjacent to each other in the vertical direction, if the measuring iron core plate 13B is on the lower side, the protrusion formed by the locking protrusion a of the iron core plate 13A is formed. Since the part is fitted into the separation hole b of the iron core plate 13B, both are fitted and locked by caulking, but if the measuring iron core plate 13B is on the upper side, there is no convex part to be fitted, so both They are simply in surface contact.
[0012]
Accordingly, a plurality of core plates 13 constituting the laminated cores 14 are stacked in the rotary die portions 6 and 7, and a measuring core plate 13B is interposed in every predetermined number of the core plates 13B. The outer peripheral surface is in frictional contact with the inner peripheral surfaces of the rotary die portions 6 and 7, but is separated from the adjacent iron core plate 13A on the lower side, and therefore when the iron core plate 13B is pushed out from the rotary die portion. Are separated from each other to form a laminated iron core 14 for one piece.
[0013]
[Problems to be solved by the invention]
However, in order to improve the productivity by increasing the reciprocating speed of the press, it has become necessary to increase the punching speed of about 600 times per minute. Separating the laminated cores 14 with the iron core plate 13B interposed therebetween has become one of the factors that hinder speeding up and product accuracy.
[0014]
That is, laminated core groups 16A, 16B, and 16C for forming a plurality of laminated iron cores 14 are laminated in a separated state in the rotary die portions 6 and 7 via the measuring iron core plate 13B. Since the state in which the dropped iron core plate 13B is on the uppermost part also occurs during the punching process, when the high-speed rotation and rotation stop of the rotating die part are repeated under these conditions, each stack in the rotating die part is repeated. Inertia is applied to the iron core group.
[0015]
In particular, the load from above may be small with respect to each core plate 13 of the laminated core group 16C which is located on the upper side in the rotary die portions 6 and 7 and does not satisfy the predetermined number required for the laminated core 14. Therefore, each iron core plate 13 rotates in a non-interlocking manner with the rotating die portion and the locking projections a and the separation holes b are displaced, so that the caulking connection becomes impossible or defective, and the quality is high. There is a possibility that the laminated core 14 cannot be manufactured.
[0016]
Therefore, the present invention provides a mold apparatus for manufacturing a laminated core that can solve such problems in the prior art, and in particular, punching speed by a simple and inexpensive means with a slight improvement to the conventional structure. The present invention provides a mold apparatus for manufacturing a laminated core capable of ensuring the product accuracy in conformity with the increase in the speed of the product and contributing to the improvement of productivity and reducing the cost of the laminated core product.
[0017]
[Means for Solving the Problems]
A die apparatus for manufacturing a laminated core according to the present invention is a caulking and coupling means provided on each iron core plate while rotating and rotating the iron core plates that are punched out into the rotary die portion. In the mold apparatus for manufacturing a laminated core in which a predetermined number of sheets are fixed in a laminated state, a step for preventing rotation of the iron core plate is formed on a part of the inner peripheral surface of the rotating die portion.
[0018]
According to this mold apparatus for manufacturing, when the rotating die portion is rotated and the iron core plate is rotated and stacked, the iron plate in the rotating die portion is prevented from being displaced due to inertial force by the step, and each iron core plate is Since the caulking coupling means provided in can be locked and held in an aligned state, it is possible to produce a laminated core with high stacking accuracy as well as secure caulking coupling that is compatible with higher punching speeds. , Can contribute to the improvement of productivity and cost reduction of products.
[0019]
The step in the mold apparatus for manufacturing functions as a detent by extending in the vertical direction at least with respect to the inner peripheral surface on the upper side of the rotating die part. In order to adapt even when the inertial force increases, it is desirable to provide a form that extends in the longitudinal direction over the entire inner peripheral surface and to provide a more reliable anti-rotation function. .
[0020]
Further, it is desirable that the step be provided in parallel to the axial direction, thereby eliminating the positional deviation between the iron core plates and improving accuracy, and the slot for winding the winding. The space of the part can be ensured and the balance of rotation when the product is made can be improved.
[0021]
Further, the step can be easily formed by a simple means for providing a convex portion or a concave portion on the inner peripheral surface of the rotary die portion. In the case of the convex portion, the outer diameter of the outer punching punch and the inner diameter of the rotary die portion. Set within the range of clearance formed by and.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A die apparatus for manufacturing a laminated core according to the present invention will be described in detail with reference to the accompanying drawings showing preferred embodiments. In the following description, the outer punching and laminating caulking portions shown in FIG. 2 is a longitudinal sectional view of the main part of the outer shape punching and laminating caulking part, FIG. 3 is a plan view thereof, FIG. 4 is a perspective view thereof, and FIG. 5 is a crossing of the main part according to another embodiment. The surface views are shown, and the same parts as those in FIG.
[0023]
The strip-shaped thin plate 12 is punched by a shearing process between the outer die punch 2 on the upper die 1 side and the die 7 on the lower die 5 side, and the iron core plate is formed in the rotary die portions 6 and 7 formed by the squeeze ring 6 and the die 7. 13 is removed, but a clearance 17 of about 0.03 to 0.05 mm is provided between the outer diameter of the outer punching punch 2 and the inner diameter of the rotary die portion, thereby obtaining a good shear cut, Friction engagement with the iron core plate 13 is enabled.
[0024]
The rotating die portions 6 and 7 are provided with an engaging convex portion 18 extending in the vertical direction on at least a part of the inner peripheral surface on the upper side. A step 19 for preventing rotation is formed between the inner peripheral surface, and the iron core plate 13 that is to be rotated in an interlocking manner by an inertial force is held by the step 19 so that the locking protrusion a and the separation hole b are formed. Prevent misalignment.
[0025]
One or a plurality of engagement convex portions 18 can be provided at appropriate positions in the rotary die portions 7 and 6, and the width thereof is not particularly limited, and has a very narrow width of about 1 to 2 mm. The step 19 formed by the engaging projection 18 is set within the range of the clearance 17 and is set to about 0.01 mm here.
[0026]
The step 19 is capable of also forming the recesses as well as the convex portion, for example, setting the stage difference 19 is provided an engagement recess 20 in place in the rotary die portions 7,6, as shown in Figure 5 it is Ru can. In this case, it is desirable to set the clearance 17 slightly smaller (the inner diameter of the rotary die portions 7 and 6 is slightly smaller) so as not to affect the product accuracy.
In the illustrated embodiment, the inner surface of the squeeze ring 6 and the die 7 itself is protruded to integrally form the engaging convex portion 18. However, the engaging convex portion 18 is formed as a separate member, and the squeeze ring is formed. 6 and the inner surface of the die 7 may be provided with a fitting groove, and a fitting member 18 may be fitted into the fitting groove. The present invention is not limited to the illustrated embodiment. Various modifications can be made within the range.
[0028]
As described above, the step 19 is formed with respect to the inner surfaces of the rotary die portions 7 and 6 so that the rotary die portions 7 and 6 are rotated and the core plate 13 is rotated and stacked. 7 and 6 prevents misalignment due to the inertial force of the iron core plate 13 on the upper side, and the locking projections a and the separation holes b are locked and held in alignment to ensure a secure caulking connection, thereby increasing the stacking accuracy. Can be manufactured.
[Brief description of the drawings]
FIG. 1 shows a longitudinal sectional view of an outer shape punching and laminating caulking portion provided in a final process of a progressive die which is one of the objects of implementation of the present invention.
2 is a longitudinal sectional view of a main part in which the present invention is applied to the outer shape punching and laminating caulking portion of FIG. 1;
3 is a plan view of a principal part in which the present invention is applied to the outer shape punching and laminating caulking portion of FIG. 1;
4 is a perspective view of a main part in which the present invention is applied to the outer shape punching and laminating caulking portion of FIG. 1;
5 is a cross-sectional view of an essential part according to another embodiment in which the present invention is applied to the outer shape punching and laminating caulking portion of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper die 2 External punch 3 Stripper plate 4 Guide post 5 Lower die 6 Die 7 Squeeze ring 8 Bearing member 9 Pulley 10 Timing belt 11 Rotation control drive device 12 Strip-shaped thin plate 13 Iron core plate 13A Connecting iron core plate 13B For measurement Iron core plate 14 Laminated iron core 15 Unloading passage 16 Laminated iron core group 17 Clearance 18 Engaging projection 19 Step 20 Engaging recess a Locking protrusion (of connecting core plate)
b Separation hole (for iron core plate for measurement)

Claims (6)

Each core plate that is punched out into the rotary die part after being punched in the outer shape is piled up by repeatedly rotating and stopping rotation of the rotary die part , and a predetermined number of sheets are fixed in a laminated state by the caulking coupling means provided on each iron core plate. In a mold apparatus for manufacturing a laminated core,
A step for preventing rotation is formed on a part of the inner peripheral surface of the rotating die portion to prevent the caulking coupling means from being displaced in the rotating direction of the rotating die portion by locking and holding the iron core plate . A mold apparatus for manufacturing a laminated iron core characterized by that.   2. The mold apparatus for manufacturing a laminated core according to claim 1, wherein the step is provided so as to extend in a vertical direction at least on an inner peripheral surface on an upper side of the rotary die portion.   The mold apparatus for manufacturing a laminated core according to claim 1, wherein the step is provided so as to extend in the vertical direction over the entire length of the inner peripheral surface of the rotary die portion.   The said level | step difference is a metal mold | die apparatus for manufacture of the laminated iron core in any one of Claims 1-3 provided in parallel with respect to the axial direction.   The said level | step difference is a metal mold | die apparatus for manufacture of the laminated iron core in any one of Claims 1-4 formed of the convex part provided in the internal peripheral surface of the rotation die part.   The mold part for manufacturing a laminated core according to any one of claims 1 to 4, wherein the step is formed by a recess provided on an inner peripheral surface of a rotating die part.

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