KR20040101593A - apparatus and method for manufacturing core lamination - Google Patents

Abstract

PURPOSE: An apparatus and a method for manufacturing a laminated core are provided to improve an accuracy even when unit errors exist on identical pitches. CONSTITUTION: A manufacturing apparatus includes a plurality of forming portions(130,140,150,160) and a blanking portion(170). The forming portions punches or presses metal strips(100) which are sporadically supplied to form a slot and an interlock tab. The blanking portion blanks the slot and the interlock tab to form a laminated core. Following relations are satisfied. P=I_nt>n x D and Int>L >=n x D. Int is an operational spacing between the forming portion and the blanking portion. P is a transport pitch of the metal strip. L is a length of a non-processed region between operations.

Description

Laminated core manufacturing apparatus and its manufacturing method {apparatus and method for manufacturing core lamination}

The present invention relates to a laminated core manufacturing apparatus and a method for manufacturing the same, and more particularly, to a laminated core manufacturing apparatus and a method for manufacturing the same, by precisely manufacturing a compact small laminated core by adjusting the pitch between the punching process.

In general, a laminated core manufactured by laminating a lamina member is used as a rotor and a stator of a generator or a motor, and a method of manufacturing the lamina core is well known in the art.

An example of a lamina member 10 is shown in FIG. 1, and a lamination core 20 is shown in FIG. 2 and the lamina member is completed. Referring to the drawings, a shaft hole 11 is formed in the center of the circular lamina member 10. A plurality of slots 12 are formed radially outside the shaft hole 11, and slot channels 13 are formed outside the slots 12.

A plurality of interlock tabs 14 are formed on the outer side of the shaft hole 11, the interlock tabs 14 being recessed embossed downwards, when the lamina member 10 is stacked. The interlock tab 14 of the b member is fitted with the interlock tab formed on the lamina member directly below to form the laminated core 20.

3 is a view for explaining a process of manufacturing the laminated core as described above. The lamina member may be manufactured by feeding the elongate shaped metal strip 100 shown in FIG. 3 to a die that is continuously punched and blanked. In the first step, a plurality of slots 12 are formed by drilling the metal strip 100 fed to the die. Subsequently, the metal strip 100 is advanced by one pitch P to be in the standby state in the second step. Next, the metal strip 100 is moved to the third step and undergoes a counter process. The counter process is a process for forming the counter hole 31 at the point where the interlock tab 14 is to be formed in order to stack the stacked cores and then separate them. This counter process is not performed for every lamina member, but for example, once every 20 times, depending on the thickness of the laminated core. When the counter process is performed, the position at which the interlock tabs 14 of the metal strip 100 are formed is punched by a punch pin (not shown). If the process is not performed, the process is simply an idle process.

Next, in the fourth step, the shaft hole 11 in the center portion is drilled. Subsequently, the metal strip 100, which is advanced one pitch further, is pressed down by a plurality of points around the shaft hole 11 by a punch pin not shown in the fifth step of the embossing process, thereby forming the interlock tab 14. . The interlock tab 14 is concave at the top and convex at the bottom. The sixth step is an idle process, in which the metal strip 100 is in standby for the seventh process without any treatment being performed.

The 7th process is a process of completing laminated core by blanking and laminating | stacking the lamina member formed as mentioned above. In this step, the outline of the lamina member is cut by the cutter and separated from the metal strip 100. The separated lamina member is pushed into a blank die (not shown) at the bottom of the die and is pressed while being stacked on top of an already blanked lamina member. At this time, since the convex portion of the lower face of the interlock tab 14 of the upper lamina member is inserted into and fitted into the upper concave portion of the interlock tab of the lower lamina member, the lamina members may be stacked on each other. If a lamina member having a counter hole instead of an interlock tab is blanked and laminated thereon after a predetermined number of sheets, for example, 20 lamina members are laminated by the same process, the lamina member has no interlock tabs. The lamina member is no longer laminated and will be separated. The laminated core thus produced is discharged to the outside through a separate outlet.

In the laminated core manufacturing method as described above, the metal strip 100 is punched or blanked by the die while moving intermittently by one pitch (P). The die includes a punch pin for forming a shaft hole 11, a slot 12, a counter hole 31, and an interlock tab 14 in the metal strip 100 so that the upper die assembly can be lifted up and down. Is installed. For example, a punch for drilling the slot 12 of the first stage and a punch for drilling the counter hole 31 of the third stage are adjacent to the upper die assembly. Punching and lifting means for carrying out subsequent processes in the same manner are provided adjacently at a pitch interval. By the way, when manufacturing the laminated core used for a micro motor etc., the said pitch P is very narrow and it is difficult to arrange | position a punch and various lifting means densely. Therefore, it is inevitable to add idle processes such as the second and sixth steps to secure the mechanical installation space between the respective processes.

This unnecessary idling process increases the total number of steps, which makes it difficult to produce precise laminated cores. Specifically, the error per pitch generated by moving the metal strip 100 by one pitch P increases as the number of process steps increases, thus increasing the overall manufacturing error.

The present invention has been made in view of the above problems, and by appropriately setting the supply pitch interval of the metal strip to ensure the mechanical installation space between each process and at the same time eliminate the idle process to reduce the total number of processes to manufacture the laminated core An object of the present invention is to provide a laminated core manufacturing apparatus and a method of manufacturing the same that can reduce errors.

1 is a plan view showing a schematic configuration of an example of a lamina member.

FIG. 2 is a schematic perspective view illustrating an example in which a lamination core is formed by laminating the lamina members of FIG. 1.

3 is a plan view representing a process on a metal strip to explain a process of manufacturing the lamina member and the laminated core according to the prior art.

4 is a schematic side view illustrating to illustrate an example of a laminated core manufacturing apparatus according to a preferred embodiment of the present invention.

5 and 6 are plan views representing a process on a metal strip to illustrate a process of manufacturing a laminated core according to a preferred embodiment of the present invention, and FIG. 5 shows that the length of the untreated area between the processes is greater than one times the blanking diameter. 6 shows a case where the length of the untreated area between the processes is larger than twice the blanking diameter, respectively.

<Description of main reference numerals in the drawings>

10. Lamina member 11. Shaft hole 12. Slot

13.Channel 14.Interlock tab 31.Counter hole

100..Metal strip 110.Die assembly 120.Punch assembly

130. Slot forming part 140. Counter hole forming part 15-0. Shaft hole forming part

160. Interlock tab forming part 170. Blanking part P. Feed pitch

I _{nt ..process} interval L .. length of untreated area

In order to achieve the above object, the laminated core manufacturing apparatus according to the present invention comprises a plurality of forming parts forming a slot and an interlock tab by punching or pressing intermittently supplied metal strips stepwise and forming the laminated core into blanks. A laminated core manufacturing apparatus comprising a blanking portion, comprising: a process interval (I _nt ) between the forming portion and the blanking portion, a transfer pitch (P) of the metal strip, and an unprocessed region length between the process on the metal strip The following relationship holds between (L) and the blanking diameter (D).

P = I _nt > n × D (n = 1,2,3 .....) and

I _nt > L ≥ n × D (n = 1,2,3 .....).

Preferably, n stacked core manufacturing apparatuses are continuously arranged such that the stacked core manufacturing process for the untreated region is continuously performed n times.

According to another aspect of the present invention, a lamination is performed by an apparatus including a plurality of forming portions for forming a slot and an interlock tab by stepping or pressing intermittently supplied metal strips, and a blanking portion for blanking them to form a laminated core. In the method of manufacturing the core,

Between the process spacing I _nt between the forming portion and the blanking portion, the feed pitch P of the metal strip, the untreated area length L between the process on the metal strip, and the blanking diameter D A laminated core manufacturing method is provided in which the following relationship is established.

P = I _nt > n × D (n = 1,2,3 .....) and

I _nt > L ≥ n × D (n = 1,2,3 .....).

Preferably, the apparatus is arranged n consecutively, such that the stacked core manufacturing process for the untreated region is performed n consecutively.

Hereinafter, exemplary embodiments of the present invention will be described in detail 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 4 shows a schematic configuration of a laminated core manufacturing apparatus according to a preferred embodiment of the present invention. Referring to the drawings, the laminated core manufacturing apparatus of the present embodiment is a die assembly 110, the metal strip 100 is supplied thereon and the punch assembly 120 is installed on the die assembly 110, the upper and lower movement up and down Include.

The punch assembly 120 is designed to move up and down at high speed by a well-known press driving means, and has various shapes and functions for punching or blanking the metal strip 100 material supplied onto the die assembly 110. Punch pins 150a to 160a are mounted. In addition, the die assembly 110 has punch holes 150b to 160b corresponding to the punch pins.

Furthermore, as a final step of the process, a blanking pin 170a for blanking the metal strip 100 to complete the lamina member and a blank die 170b for accommodating and stacking the blanked lamina member are provided with the punch assembly 120. Each of the die assemblies 110 is provided. In the present embodiment, the configuration of the die assembly 110 and the punch assembly 120 is schematically illustrated and it should be understood that the present invention is not limited by these matters, and in reality the control means for controlling the operation of the punch Various configurations can be employed, including.

Laminated core manufacturing apparatus according to the present embodiment is designed to perform a five-step process, it will be described with reference to a schematic process diagram on the metal strip 100 of FIG.

First, in the first step (I) process, the punch pin 130a mounted on the punch assembly 120 punches a plurality of slots 12 by punching a metal strip 100 intermittently supplied onto the die assembly 110. Form.

Subsequently, the metal strip 100 is intermittently conveyed by the pitch P by a conveying means (not shown), and a counter process is performed in the second step II. As described above, the counter process is to control the number of laminated cores to be finally stacked, and the metal strip 100 with the punch pins 140a to form the counter hole 31 in the lamina member corresponding to the appropriate number of sheets. It is a process of drilling. The punch pin 140a may be selected in any one of an operating state and a non-operating state by a driving means not shown. Since such a configuration is well known, a detailed description thereof will be omitted. If it is not necessary to drill the counter hole 31, the punch pin 140a is deactivated, and in this case, an interlock tab may be formed in the lamina member in a subsequent process.

In the third step (III), the punch pin 150a is lowered to drill the shaft hole 11 in the center of the metal strip 100. Next, in the fourth step IV, the plurality of interlock tabs 14 are formed by pressing the metal strip 100 while the embossing pin 160a is lowered. The interlock tab 14 is a portion of which the upper surface is concave and the lower surface is convex plastically deformed, and serves to engage with each other when the lamina members are stacked.

Finally, in the fifth step V, the lamina member is blanked by the blanking pin 170a. 5 denotes the blanking diameter of the metal strip 100 material. The blanked lamina member is inserted into the cylindrical case of the blank die 170b provided thereunder. At this time, the interlock tab of the lower lamina member, which has already been inserted, and the interlock tab of the upper lamina member to be inserted are fitted to each other to form a stacked form.

In the present embodiment, the laminated core manufacturing apparatus has been described with the lamina member and the laminated core shown in FIGS. 1 and 2 as a model, but the structure and the number of processes of such apparatus depend on the type and shape of the laminated core to be manufactured. It should be understood that any change may be made.

The apparatus of this embodiment has a plurality of forming portions and blanking portions, for example, the slot forming portion 130, the counterhole forming portion 140, the shaft hole forming portion 150, the interlock tab forming portion 160 and the blanking portion. Part 170, according to a feature of the present invention, the process interval I _nt between the forming part and the blanking part is greater than an integer multiple of the blanking diameter D shown in FIG.

I _nt > n × D (n = 1,2,3 .....)

Here, "process interval" is defined as the distance between the center and the center between each process including the forming portion and the blanking portions.

In addition, the feed pitch P of the metal strip 100 is equal to the process interval I _nt .

P = I _nt

The metal strip 100 is intermittently transferred by the transfer means P, not shown, and an untreated region A ₁ is present on the metal strip 100 between the processes. More preferably, according to a feature of the invention, the length L of the untreated area A ₁ is greater than or equal to an integer n times the blanking diameter D.

L ≥ n × D (n = 1,2,3 .....)

In the present specification and claims, the length L of the untreated area A ₁ is the distance between the lamina members to be perforated and blanked, which is the distance between the blanking boundaries of each lamina member as shown in FIG. 5. It is defined as distance. For example, FIG. 5 shows the case where the length L of the untreated region is larger than one times the blanking diameter D. FIG.

According to a more preferred embodiment of the present invention, the untreated region A ₁ may be manufactured and processed into a lamina member in a subsequent laminated core manufacturing process. Specifically, at least two or more manufacturing apparatuses of the present invention may be arranged in succession to manufacture a laminated core.

For example, when the manufacturing of the first laminated core is completed in the fifth step (V) by the first laminated core manufacturing apparatus in FIG. 5, the metal strip 100 is continuously intermittently advanced and serially connected with the first laminated core manufacturing apparatus. The stacked core manufacturing process is performed again on the untreated region A ₁ by the second stacked core manufacturing apparatus arranged. Step I 'of FIG. 5 shows a process in which the slot 12' is formed for the untreated region A ₁ by the second stacked core manufacturing apparatus.

According to a more preferred embodiment of the present invention, the spacing of the untreated area is set to be greater than or equal to an integer (n) times of the blanking diameter (D), and the stacked core manufacturing process for the untreated area is also performed at most n times. do. Referring to FIG. 6, the feed pitch P of the metal strip 100 is such that the length L of the untreated region A ₁ (A ₂ ) occurring between the respective processes is greater than twice the blanking diameter D. The stacked core manufacturing process for the untreated area A ₁ (A ₂ ) is performed twice in succession. Step I 'of FIG. 6 illustrates the slot formation process in the second stacked core manufacturing process, and step I ″ illustrates the slot formation process in the third laminated core manufacturing process.

Although not shown, the laminated core manufacturing apparatus according to the present invention may not only be disposed continuously but also arranged in a plurality of rows in parallel to manufacture a plurality of laminated cores at the same time.

The features of the present invention as described above bring effects that were not previously expected.

Specifically, in the present invention, the process interval (I _nt ) is greater than the integral multiple of the blanking diameter (D), that is, forming and blanking portions for each process of the laminated core manufacturing apparatus may be spaced apart from each other with sufficient installation intervals. Means. In particular, in the apparatus for manufacturing a rotor, a stator or the like used in a small motor, this advantage has a greater effect.

Furthermore, according to the present invention, it is possible to reduce the number of transfer pitches of the metal strips (total number of transfers of the metal strips required for producing one stacked core) required to produce the same laminated core. For example, as shown in FIG. 3, since the idle process corresponding to the second and sixth steps is essential in the conventional laminated core manufacturing, a total of seven steps may be performed for one laminated core manufacturing process. The process was required and therefore the metal strip had to be transferred seven times to complete the process. However, according to the present invention, the lamination core manufacturing process is reduced to a total of five steps since the idle step of unnecessarily waiting for the metal strip is not necessary due to securing a sufficient process interval I _nt . In this case, assuming that a pitch error caused per transfer once E _p, the prior art, a total of transfer errors than the E _TOTAL = 7 × E _p of, total transfer error of the present invention is reduced to E _TOTAL = 5 × E _p do.

The reduction of the total feed error is a factor that can improve the precision of the product despite the same unit error per pitch. Furthermore, even if the plastic deformation error occurs during the process due to the improvement of the product precision, it is possible to improve the quality of the product by continuous deterioration.

According to the present invention, since the laminated core manufacturing apparatus is capable of a continuous arrangement in the longitudinal direction instead of the parallel arrangement in the width direction, it overcomes problems such as a weakening of mold rigidity caused by the arrangement of a plurality of devices in parallel. can do. This effect can be further emphasized, particularly in the manufacture of very small laminated cores.

Claims (4)

In the laminated core manufacturing apparatus comprising a plurality of forming parts for forming a slot and an interlock tab by stepping or pressing the metal strip 100 to be intermittently supplied, and a blanking part for blanking them to form a laminated core, A process spacing I _nt between the forming portion and the blanking portion, a transfer pitch P of the metal strip 100, an untreated region length L between the process on the metal strip 100, and blanking Laminated core manufacturing apparatus, characterized in that the following relationship between the diameter (D), P = I _nt > n × D (n = 1,2,3 .....) and I _nt > L ≥ n × D (n = 1,2,3 .....). The method of claim 1, The laminated core manufacturing apparatus is n arranged continuously, laminated core manufacturing apparatus, characterized in that the laminated core manufacturing process for the untreated region is performed n times in succession. In the method for manufacturing a laminated core by a device comprising a plurality of forming portions for forming a slot and an interlock tab by stepping or pressing the metal strip 100 to be intermittently supplied and a blanking portion for blanking them to form a laminated core In A process spacing I _nt between the forming portion and the blanking portion, a transfer pitch P of the metal strip 100, an untreated region length L between the process on the metal strip 100, and blanking The laminated core manufacturing method characterized by the following relationship between the diameter (D), P = I _nt > n × D (n = 1,2,3 .....) and I _nt > L ≥ n × D (n = 1,2,3 .....). The method of claim 3, And n devices are arranged in succession, and the stacked core manufacturing process for the untreated region is performed n times in succession.