KR100943069B1 - Slot die and apparatus for manufacturing core lamination adopting the same - Google Patents

Abstract

The present invention relates to a slot die of a laminated core manufacturing apparatus in which a punch hole is formed so that a slot punch for punching a slot of a metal strip is inserted, the first die having a diagonal edge (E1) located on a first axis crossing the drill hole. A back side angle θ _L is formed, and a second back side angle θ _S is formed at the remaining corner portion E2, and the first back side angle θ _L and the second back side angle θ _{S are} formed. A slot die of different laminated core manufacturing apparatus is provided.

Laminated Core, Slot Die, Diagonal Angle

Description

Slot die of lamination core manufacturing apparatus and lamination core manufacturing apparatus employing the same {Slot die and apparatus for manufacturing core lamination adopting the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot die of a laminated core manufacturing apparatus, and more particularly, to a slot die having an improved structure to prevent rising of a slotted slot chip during a stacked core manufacturing process.

The invention also relates to a laminated core manufacturing apparatus having such a slot die.

In general, laminated cores are manufactured by sequentially punching metal strips by a press mold to form a lamina member, and laminating the lamina member thus produced, and is mainly used as a rotor and stator of a generator or a motor.

1 shows a laminated core 10 used as a rotor of a motor. Referring to the drawings, the rotor core 10 is formed by laminating a plurality of lamina members 11, the shaft hole 12 is formed in the center of the lamina member (11). A plurality of slots 13 are formed radially outside the shaft hole 12.

In addition, a plurality of interlock tabs 14 are formed on the outer side of the shaft hole 12, and the interlock tabs 14 are recesses embossed to the lower surface of the lamina member 11. When (11) is laminated, the interlock tabs 14 of the upper and lower lamina members are fitted to each other to bind the laminated cores.

2 shows a laminated core 20 used as a stator of a motor. As shown, the laminated core 20 for the stator is also formed by laminating a plurality of lamina members 21, and a plurality of slots 23 formed along the boundary between the central opening 22 and the opening 22. Include.

The interlock tab 24 is also formed in the stator laminated core 20 so that the lamina members 21 stacked on the upper and lower parts of the stator laminated core 20 may be bound to each other.

The lamination core 10 for the rotor is inserted into the opening 22, and the rotor rotates relative to the stator by electrical interaction.

The rotor lamination core 10 and the stator lamination core 20 may be continuously manufactured by a series of processes for punching a metal strip. In this manufacturing process, the slots 13 and 23 of the lamina members 11 and 21 are formed by drilling with a press die.

However, in the conventional stacked core manufacturing apparatus, the punched slot chip is not smoothly discharged under the lower die, but rather rises upward to inhibit the punching of the metal strip. Slot chips thus raised may be interposed between the lamina members and lead to product defects.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a slot die of a laminated core manufacturing apparatus having an improved structure to prevent a part of the punched slot chip from escaping from the die and rising upward.

Still another object of the present invention is to provide a laminated core manufacturing apparatus capable of producing a laminated core by smoothly punching a metal strip by providing the slot die as described above.

In order to achieve the above object, a slot die of a laminated core manufacturing apparatus according to a preferred embodiment of the present invention is a slot die of a laminated core manufacturing apparatus in which a perforation hole is formed to insert a slot punch for punching a slot of a metal strip. The first back angle θ _L is formed at the diagonal edge E1 positioned on the first axis that crosses the hole, and the second back angle θ _S is formed at the remaining edge portion E2. The first back surface angle θ _L and the second back surface angle θ _S are configured differently from each other.

Preferably, the first backside angle θ _L is smaller than the second backside angle θ _S.

More preferably, the first axis may be a long axis based on the cross-sectional shape of the drilling hole.

According to another embodiment of the present invention, a slot die of a laminated core manufacturing apparatus in which a punching hole is formed to insert a slot punch for punching a slot of a metal strip, the diagonal being positioned on a first axis across the punching hole A first back angle θ _L is formed at an edge E1, and a second back angle θ _S is formed at a portion of the diagonal edge E2 positioned on a second axis perpendicular to the first axis. A slot die of a laminated core manufacturing apparatus is provided, wherein the first back angle θ _L and the second back angle θ _S are different from each other.

According to another aspect of the invention, the lower die body is supplied with a metal strip to the upper surface; A press body installed above the lower die body to move up and down; A slot punch installed in the press body to drill a slot in the metal strip; And a slot die provided in the lower die body and having a hole formed therein so as to insert the slot punch, and having a first back angle at a diagonal edge E1 positioned on a first axis crossing the hole. θ _L ) is formed, and a second back surface angle θ _S is formed at the remaining corner portion E2, and the first back surface angle θ _L and the second back surface angle θ _S are different from each other. A core manufacturing apparatus is provided.

The slot die of the laminated core manufacturing apparatus according to the present invention can prevent the punched slot chip from being separated from the slot die and re-raising upwards, so that the punching of the metal strip can be performed smoothly, and a part of the slot chip is between the lamina members. There is an effect that can prevent the product defects caused by intervening in the original.

According to the detailed configuration of the present invention, the edge formed with the second back angle θ _S of a relatively large angle provides a function to allow the slot chip to be smoothly inserted into the drilling hole 30, and relatively The edge formed with a small angle of the first back angle θ _L serves to prevent the slot chip from coming out of the hole 30 by being contacted with both ends of the slot chip.

Other characteristic effects of the present invention will be more clearly understood through the preferred embodiments of the present invention described below.

Hereinafter, a rotation die assembly of a laminated core manufacturing apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Figure 3 shows a schematic configuration of a laminated core manufacturing apparatus employing a slot die according to a preferred embodiment of the present invention. Referring to the drawings, the laminated core manufacturing apparatus according to the present embodiment is installed on the lower die body 110 and the lower die body 110, the metal strip 100 is supplied thereon and the press body for lifting up and down 120.

The press body 120 is designed to stroke up and down at high speed by a well-known press driving means, and has various shapes for punching or blanking the metal strip 100 material supplied over the lower die body 110. Top punches with function are mounted. In addition, the lower die body 110 is provided with punch holes and dies of various configurations corresponding to the upper punch.

FIG. 4 is a view sequentially illustrating a process in which the metal strip 100 is drilled to explain a process of manufacturing a laminated core by the laminated core manufacturing apparatus. In the figure, the portions marked with hatching indicate the areas punched by the punches in the process.

3 and 4 together, the lamination core manufacturing process according to a preferred embodiment of the present invention will be described.

The lamina member (11 in FIG. 1) (21 in FIG. 2) is obtained by intermittently supplying and sequentially drilling and blanking the elongated metal strip 100 shown in FIG.

In the first process, when the metal strip 100 is supplied onto the lower die body 110, the hole punch 121 coupled to the press body 120 descends and drills the punch hole 12 in the metal strip 100. do. The punch hole 12 corresponds to the shaft hole 12 of the laminated core 10 for the rotor.

In this process, the interlock tab 14 is also formed by the interlock tab punch 122. The lamina members 11 on which the interlock tabs 14 are formed may be bound to each other in a state of being stacked up and down.

If the stacked cores are to be separated after the predetermined number of lamina members are stacked, the counter hole is punched by punching a portion where the interlock tabs 14 are to be formed by punching. This prevents the laminated lamina members from joining each other.

Subsequently, the metal strip 100 is advanced above the first slot die 111 by a transfer means, which is not shown, to perform the second process.

In the second step, the slot slot 23 for the stator is formed by drilling the metal strip 100 while the first slot punch 123 provided in the press body 120 descends toward the slot die 111. At the same time, as described above, the interlock tab 24 is formed on the upper surface of the lamina member 21 by the interlock tab punch 124.

The configuration of the first slot die 111 according to the preferred embodiment of the present invention is shown in FIGS. 5 and 6.

Referring to the drawings, the first slot die 111 of the present invention is formed with a plurality of drilling holes 30 into which the first slot punch 123 is inserted to punch the slot 23 for the stator.

The cross-sectional shape of the drilling hole 30 is configured to correspond to the shape of the slot 23 is formed (that is, corresponding to the cross-sectional shape of the first slot punch), the number is also equal to the number of slots 23 Is formed.

In addition, a center through hole 40 corresponding to the shaft hole 12 may be further formed at the center of the first slot die 111.

According to a preferred embodiment of the present invention, as shown in Figs. 7 and 8, the corner at the inlet of the drilling hole 30 of the first slot die 111, the punched slot chip inside the drilling hole 30 The taper is tapered by a predetermined angle θ so that it can be inserted smoothly.

Here, the angle θ is set differently according to the corner position of the drilling hole (30). That is, as shown in the enlarged view of FIG. 5, the first back angle θ _L formed at the edge E1 facing and positioned on the first axis A1 across the drilling hole 30 (FIG. 7) is configured to be smaller than the second back angle θ _S (shown in FIG. 8) formed at the other remaining corner portion. The back angle θ _L (θ _S ) refers to an angle formed between the tapered inclined surface formed at the corner and the extended inner circumferential surface of the drilling hole 30.

θ _L <θ _S

Hereinafter, in the present specification and claims, the "edges facing each other" will be abbreviated as "diagonal edges" and will be interpreted accordingly.

In the present invention, the first axis (A1) is preferably the longest major axis based on the cross-sectional shape of the drilling hole 30, but is not necessarily limited to this and is not necessarily limited to this of the slot (punched hole) to be punched out. It can be set arbitrarily according to the shape. In addition, the axis does not necessarily need to be a straight line, as in the embodiments described below. The criterion for setting such an axis is whether or not a portion of the punched slot chip is suitable for contact with the inner circumferential surface of the punched hole 30 as described later.

The range in which the first back angle θ _L is formed at the diagonal edge E1 on the first axis A1 is not limited to a specific value, and is suitable for fitting the end of the punched slot chip as described below. That's enough. Preferably, a first back surface angle θ _L is formed at a periphery (part E1 of FIG. 5) of the first axis A1, and a second back surface angle θ _S is formed at the remaining corner part E2. It is configured to be. That is, the second back angle θ _S is formed at most corners, and the first back angle θ _L is partially formed only at the diagonal edge E1 on the first axis A1.

In FIG. 8, the second back angle θ _S formed at the diagonal edge E1 lying on the second axis A2 perpendicular to the first axis A1 is illustrated. That is, the first back angle θ _L (FIG. 7) formed at the diagonal edge E1 lying on the first axis A1 is the second angle formed at the diagonal edge E1 lying on the second axis A2. It is smaller than the back angle θ _S (FIG. 8).

The back angle θ _L and θ _S may be appropriately set according to the shape and size of the slot (that is, the punching hole) and the press mold condition, and the like, for example, the first back angle θ _L. ) May be about 0 degrees 2 minutes, and the second backside angle θ _S may be about 0 degrees 6 minutes.

More preferably, the first back angle θ _L is very small and may correspond to a state in which no tapering process is performed.

Next, a process of drilling the metal strip 100 in the second process using the slot die 111 of the present invention having the above configuration will be described.

When the metal strip 100 is advanced and supplied on the first slot die 111 of the lower die body 110 by the conveying means, not shown, the press body 120 is lowered and thus the press body 120 is pressed. The first slot punch 123 is inserted into the drilling hole 30 of the first slot die 111 while penetrating the metal strip 100.

By this process, the slot 23 for the stator is formed in the metal strip 100.

At this time, the slot chip (not shown) punched in the shape of the slot 23 is inserted into the drilling hole 30 of the first slot die 111, and in this process, most of the corners of the drilling hole 30 are relatively formed. Since the second back angle θ _S of a large angle is formed, the punched slot chip may be smoothly inserted into the drilling hole 30.

On the other hand, since the first back angle θ _L of a relatively small angle is formed at the diagonal edge E1 lying on the first axis A1, both ends of the slot chip corresponding to this position are formed in the drill hole 30. It is pressed against the inner circumference of the. Therefore, since both ends of the slot chip are fitted with the diagonal edge E1, the slot chip is separated from the hole 100 and does not come out.

In other words, the second back angle θ _S of a relatively large angle provides a function to allow the slot chip to be smoothly inserted into the drilling hole 30, and the first back angle θ of a relatively small angle. _L ) serves to prevent both ends of the slot chip from being pushed out of the hole 30 by contact support.

By the above process, the metal strip 100 in which the stator slot 23 is punched proceeds to the third process, which is the next process, and the rotor slot 13 is punched out.

That is, the second slot punch 125 provided in the press body 120 descends toward the second slot die 112 to drill the metal strip 100 to form the plurality of rotor slots 13. Of course, the rotor slot 13 is formed inside the slot 23 for the stator punched in the previous process.

The configuration of the second slot die 112 used in this process is shown in FIGS. Like the first slot die 111 described above, the second slot die 112 also has a plurality of perforation holes 30 ′ whose edges at the inlet are tapered by a predetermined angle θ.

In addition, as shown in FIGS. 10 and 11, a first back angle θ _L (Fig. 2) is formed at the diagonal edge E1 'positioned on the third axis A3 across the drilling hole 30'. 10) is formed, and the second back surface angle θ _S (FIG. 11) is formed at the remaining edge E2 ′. The relationship between the back angles θ _L and θ _S satisfies Equation 1 described above.

Therefore, the operation in which the rotor slot 13 is formed in the third process and the supporting process of the slot chip are the same as in the aforementioned process.

After the rotor slot 13 is formed as described above, when the metal strip 100 advances and reaches the IV process, the lamination core 10 for the rotor is completed by blanking and laminating the lamina member 11 for the rotor. do. In this process the outer boundary of the lamina member 11 is cut by the blanking punch 126 and separated from the metal strip 100. The separated lamina member 11 is pushed into the rotation die 113 provided in the lower die body 110 and pressed while being stacked on top of another lamina member that is already blanked.

At this time, the lower surface convex portion formed in the interlock tab 14 of the lamina member 11 laminated on the upper side is inserted into and fitted into the upper concave portion of the interlock tab 14 of the lamina member 11 at the lower portion. The lamina members can be bound to each other. Then, after a predetermined number, for example, 20 lamina members are laminated by the same process, the lamina member having a counter hole formed in place of the interlock tab is blanked and stacked thereon so that the lamina members are no longer laminated and separated. do. The manufactured laminated core 10 for the rotor is discharged downward.

After the lamina member for the rotor is blanked, the metal strip 100 proceeds to process V. In this process, the air gap region is formed by the cylindrical air gap punch 127 and the lower air gap die 114. It is punched out.

Then, the metal strip 100 is transferred to the VI process to punch out the notch (15 in FIG. 4) and then blank the stator lamina member 21 by a blanking punch (128 in FIG. 3).

The blanked stator lamina member 21 is pushed into the rotation die 115 provided in the lower die body 110 and laminated on top of another already laid blank lamina member, as described above in the process. The upper and lower lamina members 21 are coupled to each other by the interlock tab 24.

After lamination of the predetermined number of lamina members, the laminated core for stator may be separated and discharged by blanking the lamina member having the counter hole.

Although in the present embodiment, the configuration of the lower die body 110 and the press body 120 and the respective punching process specifically illustrated, it should be understood that the present invention is not limited by these matters, and actually the desired laminated core Of course, the structure and process of the apparatus can be variously modified according to the structure of the.

The configuration of the lower die 116 according to another embodiment of the present invention is shown in FIGS. 12-14.

The die 116 of this embodiment is used to punch the portion where the interlock tab is formed to form a counter hole 30 ". This operation is performed after laminating a predetermined number of lamina members, as described above. It is performed for the purpose of separating the cores.

Although the counter hole 30 "is distinguished from the slots 13 and 23, it can be said to be the same as a slot in the process surface punched by a punch. Therefore, the slot used by this specification and a claim, Slot punches and slot dies include the above counter holes and their processing equipment, and should be broadly interpreted to include all processes and equipment for punching out and separating portions of metal strips.

Also in this embodiment, the first back angle θ _L (FIG. 13) is formed at the diagonal edge E1 ″ lying on the fourth axis A4 across the counter hole 30 ″. A second back angle θ _S (FIG. 14) is formed in the remaining corner portion E2 ″. The relationship between the back angles θ _L and θ _S satisfies Equation 1 above.

Although the present invention will be described in detail with reference to the following drawings, these drawings illustrate preferred embodiments of the present invention, and the technical concept of the present invention is not limited to the drawings and should not be interpreted.

1 is a perspective view showing the configuration of a laminated core for a general rotor.

2 is a perspective view showing the configuration of a laminated core for a general stator.

3 is a view showing a schematic configuration of a laminated core manufacturing apparatus employing a slot die according to a preferred embodiment of the present invention.

4 is a diagram sequentially illustrating a process of drilling a metal strip by a laminated core manufacturing apparatus.

5 is a plan view showing a configuration of a slot die according to a preferred embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along line S-S 'of FIG. 5.

FIG. 7 is a cross-sectional view taken along line II ′ of FIG. 5.

FIG. 8 is a cross-sectional view taken along the line II-II 'of FIG. 5.

9 is a plan view showing the configuration of a slot die according to another preferred embodiment of the present invention.

FIG. 10 is a cross-sectional view taken along line III-III ′ of FIG. 9.

FIG. 11 is a cross-sectional view taken along line IV-IV 'of FIG. 9.

12 is a plan view showing the configuration of a slot die according to another preferred embodiment of the present invention.

FIG. 13 is a cross-sectional view taken along the line VV ′ of FIG. 12.

14 is a cross-sectional view taken along the line VI-VI 'of FIG. 12.

<Description of Major Reference Numbers in Drawing>

10: laminated core for rotor 11, 21: lamina member

12: shaft hole 13,23: slot

14, 24: interlock tab 20: laminated core for stator

22: opening 30: drilling hole

40: center through hole 100: metal strip

110: lower die body 111, 112: slot die

113, 115: rotation die 114: air gap die

120: press body 121: hole punch

122, 124: interlock tab punch 123: first slot punch

125: second slot punch 126,128: blanking punch

127: air gap punch E1, E2: diagonal corner

Claims (8)

A slot die of a laminated core manufacturing apparatus in which a punch hole is formed to insert a slot punch for punching a slot of a metal strip, A first back angle θ _L is formed at a diagonal edge E1 positioned on the first axis that crosses the hole, and a second back angle θ _S is formed at the remaining corner portion E2. , And the first back angle θ _L and the second back angle θ _S are different from each other. The method of claim 1, The first backside angle θ _L is smaller than the second backside angle θ _S. The method of claim 2, The first axis is a slot die of the laminated core manufacturing apparatus, characterized in that the long axis based on the cross-sectional shape of the drilling hole. A slot die of a laminated core manufacturing apparatus in which a punch hole is formed to insert a slot punch for punching a slot of a metal strip, A first back angle θ _L is formed at a diagonal edge E1 located on the first axis that crosses the hole, and a diagonal edge E2 located on a second axis that is orthogonal to the first axis. The second back angle θ _S is formed in the portion, And the first back angle θ _L and the second back angle θ _S are different from each other. The method of claim 4, wherein The first backside angle θ _L is smaller than the second backside angle θ _S. The method of claim 5, The first axis is a slot die of the laminated core manufacturing apparatus, characterized in that the long axis based on the cross-sectional shape of the drilling hole. A lower die body to which a metal strip is supplied to the upper surface; A press body installed above the lower die body to move up and down; A slot punch installed in the press body to drill a slot in the metal strip; And And a slot die provided in the lower die body and having a hole formed therein so that the slot punch is inserted therein. A first back angle θ _L is formed at a diagonal edge E1 positioned on the first axis that crosses the hole, and a second back angle θ _S is formed at the remaining corner portion E2. And the first back surface angle θ _L and the second back surface angle θ _S are different from each other. The method of claim 7, wherein The first backside angle θ _L is smaller than the second backside angle θ _S.

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