WO2019172157A1

WO2019172157A1 - Mold

Info

Publication number: WO2019172157A1
Application number: PCT/JP2019/008280
Authority: WO
Inventors: 武本田
Original assignee: 日本電産株式会社
Priority date: 2018-03-08
Filing date: 2019-03-04
Publication date: 2019-09-12
Also published as: CN213671349U

Abstract

[Problem] To provide a mold of which durability is increased without affecting processing performance. [Solution] A mold 1 for punching a steel sheet in a predetermined shape. The mold 1 is provided with a body portion 11, and a first processing portion 21 for processing a steel sheet. The body portion 11 includes a central portion 12 extending along an axis P, and an drawing portion 13 extending outward from the central portion 12 as viewed from one side of the axis P. The first processing portion 21 is positioned at the distal end portion of the drawing portion 13. The body portion 11 is configured from a material having a higher toughness than the first processing portion 21.

Description

Mold

The present invention relates to a mold.

A mold for forming a rotor core member of a motor from a steel plate is known. This metal mold is used for the manufacturing method of the laminated iron core disclosed by patent document 1, for example. In this method of manufacturing a laminated iron core, a punching process, a bending process, a cutting process, a pushback process, and the like are continuously performed on a workpiece plate introduced by a feeding device using a progressive die. In the method of manufacturing a laminated core disclosed in Patent Document 1, a processed body that forms a laminated core and in which an annular portion and a fan-shaped main body portion are connected by a connecting portion is formed by the progressive die. *

Generally, a mold for forming a rotor core member from a steel plate as described above includes a punch and a die. These punches and dies are made of a single metal material such as cemented carbide or iron-based material. By sandwiching the steel plate with the punch and die, the steel plate can be processed into a predetermined shape of the rotor core member.

JP 2017-093067 A

By the way, when using the metal mold | die containing a punch and die | dye, and forming the processed body with which the annular part and the fan-shaped main-body part were connected by the connection part like the above-mentioned patent document 1, the shape of the said processed body In some cases, at least one of the punch and the die has a portion that is thinner and lower in strength than the other portions. *

In general, the punch and die of a mold are made of a single metal material. Therefore, as described above, when at least one of the punch and the die has a portion that is thinner and lower in strength than the other portions, when the number of times of punching by the mold is large, the portion that is thin and low in strength is used. Damage can occur. *

The objective of this invention is providing the metal mold | die which can improve durability, without affecting processing performance.

The metal mold | die which concerns on one Embodiment of this invention is a metal mold | die which punches a steel plate in a defined shape. The mold includes a main body portion and a first processing portion that processes the steel plate. The main body includes a central portion extending along the axis, and an extending portion extending outward from the central portion when viewed from one of the axes. The first processing portion is located at a tip portion of the extending portion. The main body is made of a material having higher toughness than the first processed portion.

According to the metal mold | die which concerns on one Embodiment of this invention, durability can be improved, without affecting processing performance.

FIG. 1 is a plan view showing an example of a rotor core member. FIG. 2 is a perspective view showing a schematic configuration of a punch which is an example of a mold according to the present embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same or an equivalent part in a figure, and the description is not repeated. Moreover, the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimensional ratio of each structural member, or the like. *

In the following description, the direction extending from the center of the rotor core member 100 to the outer peripheral side in plan view is referred to as “radial direction”, and the direction along the outer periphery of the rotor core member 100 is referred to as “circumferential direction”. However, the definition of this direction is not intended to limit the direction of use of the motor according to the present invention. *

In addition, in the following description, the expressions “fixed”, “connection”, “attach”, etc. (hereinafter, “fixed”, etc.) are not limited to the case where the members are directly fixed, but also fixed via other members. It includes cases where That is, in the following description, expressions such as fixation include the meanings of direct and indirect fixation between members. *

(Configuration of Rotor Core Member) FIG. 1 shows a schematic configuration of a rotor core member 100 formed by a mold 1 according to an embodiment of the present invention. The rotor core member 100 has a disk shape. A plurality of rotor core members 100 are stacked in the thickness direction to constitute a rotor core of a motor (not shown). Note that the configuration of the motor is the same as the conventional configuration, and thus the description thereof is omitted. The rotor core member 100 is used for a so-called inner rotor type motor in which a rotor is rotatably disposed in a cylindrical stator. *

The rotor core member 100 is a plate-like member and is composed of an electromagnetic steel plate. The rotor core member 100 includes an annular annular portion 110 and a plurality of core main body portions 120 extending radially outward from the annular portion 110. *

The annular portion 110 has a shaft insertion hole 111 through which a shaft (not shown) passes. The annular portion 110 has a plurality of first protrusions 112 and a plurality of second protrusions 113 on the outer peripheral side. The plurality of first protrusions 112 and the plurality of second protrusions 113 are alternately positioned in the circumferential direction. *

The plurality of core main body portions 120 extend radially outward from the outer periphery of the annular portion 110. Each core main body 120 has a fan shape in a plan view that expands outward in the radial direction. Moreover, the radial direction outer peripheral side of each core main-body part 120 is circular arc shape by planar view. The radially outer peripheral side of the plurality of core main body portions 120 constitutes the outer peripheral side of the rotor core member 100. *

The core main body 120 and the annular portion 110 are connected by a connecting portion 123. The connecting portion 123 is located between the first protruding portion 111 and the second protruding portion 112 on the outer periphery of the annular portion 110. The width dimension of the connecting portion 123 is smaller than the width dimension of the core body portion 120. In addition, the said width dimension means the dimension of the circumferential direction. *

The core main body 120 has a through hole 121 and a caulking portion 122. The through hole 121 is filled with resin in a state where a plurality of rotor core members 100 are stacked in the thickness direction. Thereby, the several rotor core member 100 laminated | stacked on the thickness direction can be integrated with resin. The caulking portion 122 is a portion that is caulked in a state where the plurality of rotor core members 100 are stacked in the thickness direction. *

Between the core body parts 120 adjacent to each other in the circumferential direction, a slot 130 in which a rotor magnet (not shown) is accommodated is located. The slot 130 extends radially outward from the outer periphery of the annular portion 110. That is, the motor having the rotor core member 100 of the present embodiment is a so-called IPM motor (Interior Permanent Magnet Motor) in which a rotor magnet is housed in the rotor core. In the following description, in the slot 130, the annular portion 110 side is referred to as a slot bottom. *

The rotor core member used in the motor is not limited to the rotor core member 100 having the above-described configuration, and may have any shape. In the rotor core member, the core body 120 may be separated from the annular portion 110. *

(Mold) Although not particularly illustrated, the rotor core member 100 having the above-described configuration is formed by punching a steel plate using a plurality of types of molds. For example, the core body 120 is formed by punching the slot 130 from the steel plate with a mold including a punch having the same shape as the slot 130 on the machining surface and including a punch having the same shape as the outer shape of the core body 120. Is punched out. *

The rotor core member 100 may be formed by punching with three or more types of dies, or may be formed by punching with one type of dies. *

Since the method of punching the rotor core member 100 from the steel plate with a mold is the same as that in the prior art, a detailed description is omitted. *

In the present embodiment, in the mold for punching the rotor core member 100 from the steel plate, the processed portion is made of a relatively hard material in consideration of the processing performance, while the other portions are materials having higher toughness than the processed portion. Consists of. Thereby, durability of a metal mold | die can be improved, without impairing the processing performance of a metal mold | die. *

Below, an example of the metal mold | die of this embodiment is demonstrated using the metal mold | die 1 shown in FIG. *

The mold 1 is a punch that punches out the radially outer peripheral side of the core body 120 of the rotor core member 100 and forms the first protrusion 112 of the annular portion 110. The mold 1 forms a part of the rotor core member 100 together with a die (not shown). The mold 1 is movable along the axis P with respect to the die. The die has a configuration in which a part of the mold 1 can move inside. In FIG. 2, reference numeral 2 denotes a pedestal of the mold 1. *

The mold 1 has a columnar shape extending along the axis P. The mold 1 includes a main body portion 11, a first processing portion 21, and a second processing portion 31. The main body 11 has a columnar shape extending along the axis P. The main body 11 includes a columnar central portion 12 extending along the axis P, and an extending portion 13 extending radially from the central portion 12 when viewed from one of the axes P. *

The extending portion 13 extends outward from the central portion 12 in a plurality of directions (eight directions in the present embodiment) when viewed from one of the axes P. The extending portion 13 has a width dimension that is larger toward the distal end portion on the radially outer side when viewed from one of the axes P. That is, the extending portion 13 has a width dimension on the base end side smaller than the width dimension of the distal end portion when viewed from one of the axes P. Thus, the extending portion 13 has a shape whose strength on the proximal end side is smaller than that of the distal end portion. The width dimension is a dimension in the circumferential direction of the mold 1. *

The first processing part 21 is located at the tip of the extending part 13. The first processed portion 21 forms the radially outer peripheral side of the core main body portion 120 of the rotor core member 100. The first processed portion 21 is a columnar member extending along the axis P, and is fixed to the distal end portion of the extending portion 13. The fixing of the first processed portion 21 to the extending portion 13 may be realized by any fixing method. *

The second processed portion 31 is located on the base end side of the extending portion 13 in the main body portion 11. The second processed portion 31 is located on the central portion 12 and between the plurality of extending portions 13. Specifically, the 2nd process part 31 is located between the extending parts 13 adjacent on the center part 12 and the circumferential direction. The second processed portion 31 forms the first protrusion 112 of the annular portion 110 of the rotor core member 100. The second processed portion 31 is a columnar member that extends along the axis P, and is fixed to the outer peripheral surface of the central portion 12. The fixing of the second processing portion 31 to the central portion 12 may be realized by any fixing method. *

That is, in the mold 1, the first processing portion 21 processes the radially outer peripheral side of the rotor core member 100. On the other hand, the second processing unit 31 processes the slot bottom of the rotor core member 100. *

The first processing unit 21 and the second processing unit 31 are made of a material (for example, a metal material) that is harder than the main body unit 11. The main body 11 is made of a material having higher toughness than the first processed part 21 and the second processed part 31. *

Specifically, for example, the first processing unit 21 and the second processing unit 31 are made of cemented carbide or the like. The main body 11 is made of an iron-based material such as steel. In addition, as long as the 1st process part 21 and the 2nd process part 31 are materials larger in hardness than the main-body part 11, you may be comprised with materials other than a cemented carbide alloy. Moreover, the main-body part 11 may be comprised with materials other than a ferrous material, if it is a material with higher toughness than the 1st process part 21 and the 2nd process part 31. FIG. *

In general, a processed part of a mold is gradually worn by processing of a steel plate or the like, but the amount of wear varies depending on the position of the processed part. In this case, the processing resistance when processing the steel sheet is different. Therefore, a force in the twisting direction is likely to be generated in the portion that supports the processed portion. *

In the case of the above-described mold 1, when the amount of wear varies depending on the position in the first processed portion 21, a force in the twisting direction acts on the extending portion 13 that supports the first processed portion 21. If it does so, damage may arise in the extending part 13. *

On the other hand, as described above, the main body 11 is made of a material having higher toughness than the first processed portion 21, so that the occurrence of damage to the stretched portion 13 can be suppressed. Therefore, with the configuration of the present embodiment, the durability of the mold 1 can be improved without affecting the processing performance of the mold 1. *

Further, the extending portion 13 of the mold 1 has a width dimension on the base end side smaller than the width dimension of the distal end portion when viewed from one of the axes P. *

Thus, when the width dimension of the base end side of the extending portion 13 is smaller than the width dimension of the distal end portion when viewed from one of the axes P, the first processed portion 21 located at the distal end portion of the extending portion 13 is made of a steel plate. When a force is applied to the first processed portion 21 during processing, the extending portion 13 is likely to be damaged. *

On the other hand, by forming the main body 11 of the mold 1 with a material having higher toughness than the first processed portion 21 as described above, it is possible to suppress the occurrence of damage to the stretched portion 13. Therefore, with the above-described configuration, the durability of the mold 1 can be improved without affecting the processing performance of the mold 1. *

The mold 1 further includes a second processing unit 31. The second processed portion 31 is located on the base end side of the extending portion 13 in the main body portion 11. The main body 11 is made of a material having higher toughness than the second processed portion 31. *

Thereby, when processing a steel plate with the metal mold 1, force is also applied to the second processing portion 31 located on the base end side of the extending portion 13 in the main body portion 11. Therefore, since the force generated not only in the first processing portion 21 but also in the second processing portion 31 is applied to the extending portion 13, the extending portion 13 is easily damaged. *

In such a configuration, by forming the main body portion 11 with a material having higher toughness than the first processed portion 21 as described above, the occurrence of damage to the stretched portion 13 can be suppressed. Therefore, with the above-described configuration, the durability of the mold 1 can be improved without affecting the processing performance of the mold 1. *

Further, the main body 11 of the mold 1 has a plurality of extending portions 13 extending outward from the central portion 12 in a plurality of directions when viewed from one of the axes P. The second processed portion 31 is located on the central portion 12 and between the plurality of extending portions 13. *

Thereby, when processing a steel plate with the metal mold | die 1, force is also applied to the 2nd process part 31 located on the center part 12 and between the some extending | stretching parts 13. FIG. Therefore, since the force generated not only in the first processing portion 21 but also in the second processing portion 31 is applied to the extending portion 13, the extending portion 13 is easily damaged. *

In such a configuration, by forming the main body portion 11 of the mold 1 with a material having higher toughness than the first processed portion 21 as described above, occurrence of damage to the stretched portion 13 can be suppressed. Therefore, with the above-described configuration, the durability of the mold 1 can be improved without affecting the processing performance of the mold 1. *

Moreover, the 1st process part 21 of the metal mold | die 1 forms the outer peripheral side of the rotor core member 100 (predetermined shape) in a steel plate. Even when a force is applied to the first processing portion 21 when processing the outer peripheral side of the rotor core member 100, the main body portion 11 of the mold 1 can be prevented from being damaged by the above-described configuration. *

Moreover, the main-body part 11 of the metal mold | die 1 is comprised with a ferrous material. The first processed portion 21 is made of a cemented carbide harder than the main body portion 11. Thereby, while being able to suppress the damage of the extending | stretching part 13 of the main-body part 11, a 1st process part 21 can process a steel plate easily. *

Other Embodiments Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention. *

In the embodiment, the punch has been described as an example of the mold 1. However, you may apply the structure of the said embodiment to die | dye. In addition, if the mold has a main body made of a material having higher toughness than the processed portion, and the processed portion is located at the tip of the extending portion extending outward from the central portion of the main body, The configuration of the above embodiment may be applied to a mold having a configuration other than the mold 1. *

In the embodiment, the mold 1 includes the first processing unit 21 and the second processing unit 31. However, the mold 1 may have only the first processed portion 21. *

In the above embodiment, the mold 1 punches the rotor core member 100. However, the mold may be stamped from a stator core member constituting the stator core, or may be stamped from other members. That is, the structure of the said embodiment is applicable to the metal mold | die which punches a member from a steel plate.

The present invention is applicable to a mold for punching a steel plate into a predetermined shape.

DESCRIPTION OF SYMBOLS 1 Mold 11 Main part 12 Central part 13 Extension part 21 1st process part 31 2nd process part 100 Rotor core member 110 Annular part 111 Shaft insertion hole 112 1st projection part 113 2nd projection part 120 Rotor core body part 121 Through-hole 122 Caulking part 123 connecting part 130 slot P axis

Claims

A die for punching a steel plate into a predetermined shape, comprising: a main body portion; and a first processing portion for processing the steel plate, wherein the main body portion extends from the central portion extending along the axis, and from one of the axes. As seen, the extending portion extends outward from the central portion, the first processing portion is located at a tip portion of the extending portion, and the main body portion is tougher than the first processing portion. Mold made of high materials.
2. The mold according to claim 1, wherein the extending portion has a width dimension on a proximal side smaller than a width dimension of the distal end portion when viewed from one of the axes.
3. The mold according to claim 1, further comprising: a second processing portion that processes the steel plate, wherein the second processing portion is located on a base end side of the extending portion in the main body portion, and the main body portion. Is a mold made of a material having higher toughness than the second processed part.
4. The mold according to claim 3, wherein the main body portion includes a plurality of extending portions extending outward from the central portion in a plurality of directions when viewed from one of the axes, and the second processing. The part is a mold located on the central part and between the plurality of extending parts.
The metal mold | die as described in any one of Claim 1 to 4 WHEREIN: A said 1st process part is a metal mold | die which forms the outer peripheral side of the said predetermined shape in the said steel plate.
In the metal mold | die as described in any one of Claim 1 to 5, the said main-body part is comprised with an iron-type material, The said 1st process part is comprised with a hard metal harder than the said main-body part, Mold.
The mold according to any one of claims 1 to 6, wherein the predetermined shape is a rotor core.