JPH0256178B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a method for attaching a rotating shaft to an attachment part (hereinafter simply referred to as an attachment part) such as a yoke, a wheel, a shaft of a frame, a rod, etc.
A transfer process in which rod-shaped parts such as axles, mounting shafts, and mounting rods (hereinafter simply referred to as rod-shaped parts) are press-fitted, and the rod-shaped parts are press-fitted in orthogonal directions such as the vertical, horizontal, and vertical directions of the mounting parts. A method of fixing rod-shaped parts to attached articles such as integrally molded shafts and rods using APRESS.

``Prior Art'' Conventionally, the method of press-fitting and fixing a rod-shaped component into this type of mounting component is to punch out a mounting hole for the rod-shaped component in the mounting component, which is usually formed by drawing. There is. On the other hand, the intervening part to be caulked into the mounting hole is manufactured by cutting, and the machined rod-shaped part is press-fitted into the intervening part. Therefore, the intervening part into which the bar-shaped part is press-fitted is fitted into the mounting hole of the mounting part, and then the intervening part is press-fitted to fix the bar-shaped part to the mounting part.

The method of press-fitting and fixing the rotor shaft into the yoke for a fan motor, which is the main object of the present invention, is also substantially the same as the above-mentioned example, as shown in FIG. That is, a mounting hole 20 for the rotor shaft is formed in the yoke 19 formed by blanking, drawing, molding, or the like. On the other hand, the bush 22 which is caulked into the mounting hole 20 is manufactured by cutting, and the cut rotor shaft 21 is press-fitted into the bush 22 and integrated therewith. Therefore, the rotor shaft 21 is press-fitted into the bush 22 into the mounting hole 20 of the yoke 19.
After that, the rotor shaft 21 is fixed to the yoke 19 by press-fitting the bush 22.

The yoke for a fan motor is shown below as a typical example of the mounting parts, and the rotor shaft that is press-fitted into the yoke for the fan motor is shown as a typical example of a rod-shaped component. A method for doing so will be described in detail, but it is needless to say that the method is not limited to this example.

Furthermore, the following inventions can be cited as similar technical documents.

Specifically, JP-A No. 55-147443 discloses a method for manufacturing rotating parts for power transmission, JP-A No. 52-25909 discloses a method for manufacturing flywheels, and JP-A No. 55-38210 discloses components such as timing belt pulleys and gears and their manufacturing method. There is also a method for manufacturing a toothed pulley for an engine timing belt, disclosed in Japanese Patent Publication No. 59-11374 (hereinafter collectively referred to as "prior invention").

[Problems to be Solved by the Invention] In order to fix the rotor shaft to the yoke according to the above-mentioned prior art, an intervening part called a bush is required. This increased the number of parts and caused many problems in manufacturing these intervening parts. In other words, it is difficult to maintain the parts, and in order to fix the rotor shaft orthogonally to the yoke, the bushings must have dimensional accuracy. They will be required to be in a relationship.
For this reason, when manufacturing bushings, it is naturally necessary to manufacture them by cutting, which requires manufacturing technology, manufacturing time, and incidental equipment, and reduces work efficiency and costs. There are quite a few problems in terms of production and factory management. In addition, in the assembly process, an additional step of caulking the yoke and the bushing is added, which increases the number of work steps and requires additional equipment, making it difficult to improve the efficiency of the assembly process and improve factory management. There is plenty of room for this. It is true that in conventional inventions, the boss part (bearing part, etc.) into which the rod-shaped component is inserted is formed by reverse drawing so that it has a predetermined rising dimension, but in both cases, the thickness and the rising root part are Consideration has been given to the wall thickness so that the boss part of the mounting part does not break, and has a rising dimension that has strength and holding power, and a rising root portion that has a specified wall thickness. This method is not suitable for molding.

``Means for Solving the Problems'' In view of the above, the present invention eliminates the intervening parts called bushes, integrally molds the rising boss portion of the yoke body using a transfer press, and presses and secures the rotor shaft into the boss portion. At the same time, the rising boss part is given a predetermined rising dimension and strength to securely hold the rotor shaft with a certain holding force, and the strength and accuracy of the rotor shaft are improved. The yoke is completed by a transfer press, which performs board punching, several drawing steps, forming, trimming, and inner diameter cutting to obtain a finished part. In the process, a reverse drawing process is used to form the boss part of the yoke that holds the rotor shaft, and a reverse drawing process is used to plastically deform the boss part to ensure a predetermined rising dimension and a predetermined wall thickness at the rising root part. In order to ensure a predetermined strength and holding force for this boss, the boss must have a specified rising dimension and wall thickness, and the root of the rising portion of the boss must have a specified height. A thick annular R portion (hereinafter simply referred to as R portion) is formed on the inner and outer surfaces, and the outer surface side of this R portion is made thicker, and the inner surface side of the R portion is made thicker. After applying a reverse drawing process to increase the wall thickness, a mounting part is formed that has a boss section with a rising dimension that has the above-mentioned strength and holding power, and a rising root portion that has a specified wall thickness. , the rotor shaft is press-fitted into the boss of the mounting part, which has a rising dimension that has this strength and holding power, and a rising root portion that has a specified wall thickness, and then the rotor shaft is press-fitted into the yoke in a direction perpendicular to this. A method of fixing the rotor shaft to an integrally molded yoke using a transfer press configured to press-fit and fix the rotor shaft into the yoke.

``Operation'' Next, the operation of the present invention will be briefly explained. A material corresponding to the dimensions required for manufacturing a drawn product, so-called yoke, is taken from the plate material supplied to the transfer press. After that, various drawing and reverse drawing processes are performed to form the yoke prototype. In this case, the rising dimension of the boss portion of the yoke and the wall thickness at the rising root portion of the boss portion are ensured. This ensures the accuracy and strength of the rotor shaft that is press-fitted into the boss. Then, as a final step, the inner diameter is punched, an opening is created in the boss, and the finished yoke is removed from the transfer press. Thereafter, the machined rotor shaft is press-fitted into the boss portion of this yoke, thereby completing the yoke product of the fan motor integrated here.

``Example'' Next, an example of the present invention will be described based on the drawings.The upper die PB1 and the lower die DB of the transfer press
A material 2 corresponding to the dimensions required for manufacturing a drawn product, so-called a yoke, which will be described later, is drawn from a plate material 1 supplied during the drawing process (see FIG. 1).
This material 2 is transferred to the next station and the upper mold
It is supplied between the PB2 and the lower die DB2, where it is deep drawn to form a cylindrical container shape. This gives a deep container product 3 (see FIG. 2). Product 3 of deep drawn containers processed in this way
is transferred to the next station and supplied between the upper die PB3 and the lower die DB3, where it is redrawn to form a flange 3a on the upper edge of the product 3 in the deep container. This gives a product 4 in the form of a flanged deep container (see FIG. 3). The product 4 in this flanged deep container is then transferred to the next station and supplied between the upper mold PB4 and the lower mold DB4. Here, the inner bottom surface of the flanged container product 4 is subjected to an upward reverse drawing process, and the boss portion bulging piece 4 is
Form a. As a result, a product 5 of a flanged deep container with a bulging boss portion is obtained (see FIG. 4). Subsequently, the product 5, which is a flanged deep container with a bulging boss portion, is transferred to the next station and supplied between the upper mold PB5 and the lower mold DB5. Here, the drawing process is repeated again to make the boss portion bulging piece portion 4a stand up thinly, so that a sufficient upright dimension of the boss portion, which will be described later, is ensured. In this way, it is desirable to form a thickness sufficient to ensure the wall thickness of the root portion of the boss portion, as will be described later. Note that this re-drawing process is usually repeated several times to make the boss bulging piece 4a stand up one after another, so that the product 5, which is a deep flanged container with an elongated boss bulging piece, is produced in this step. (See Figure 5). Then, the product 5, which is a deep container with flanges and has a bulging piece of the boss part, is transferred to the next station, where the upper mold PB6 and the lower mold DB6
In this example, the boss portion bulging piece portion 4a is formed into a stepped portion 5a and a boss rising portion 5b. As is clear from the sectional view, the meat is actively collected at the so-called R portion of the root portion 5b' so that the boss rising portion 5b maintains sufficient strength. More specifically, the outer surface side R1 of this R portion is largely bulged out to make it thick, and the inner surface side R2 is slightly bulged out so that this surface is also thick. By processing the wall thickness in this way, as mentioned above, the boss part is configured to be able to securely hold the rotor shaft with a reliable holding force, and the strength and accuracy of the rotor shaft are improved. The press die is configured to prevent weakening of the press die. In addition, as will be described later, in order to ensure the perpendicularity of the rotor shaft to the yoke, as well as to ensure the strength and holding power of the yoke, the rotor shaft is molded to a predetermined dimension and the root of the yoke is thickened. It is desirable that the boss portion be thick. In the manner described above, a product 6 of a flanged deep container having a boss rising portion is obtained. In this case, it is preferable to provide several air vent holes 7 in the lower mold DB6 as shown in the figure to increase the strength of the lower mold DB6 (see FIG. 6). Next, product 6 of a deep container with a flange equipped with a boss rising part.
is transferred to the next station and supplied between an upper mold and a lower mold (not shown), where the flange 3a is cut off to obtain a product 8 in the form of a deep container with a raised portion of the boss (see FIG. 7). The thus obtained product 8 in a deep container with a boss rising part is transferred to the next station and supplied in an inverted state between an upper die and a lower die (not shown), where the inner diameter is punched. The upper surface of the boss rising portion 5b is removed and a rotor mounting hole 10 is opened. As a result, a yoke 9 is obtained which is provided with a boss portion 9a having a prescribed rising dimension and a boss portion 9a having a thicker wall (having a prescribed wall thickness) than various parts of the yoke 9 (see FIG. 8).

A rotor shaft 11 for a fan motor manufactured by cutting is press-fitted into the hole 10 of the boss portion 9 of the finished yoke 9 formed through the above-mentioned processes, and rotates relative to the yoke 9. The child shaft 11 is press-fitted and fixed, and an accurate orthogonal angle is established between the yoke 9 and the rotor shaft 11.

Although the method of press-fitting and fixing the yoke 9 and rotor shaft 11 has been described in detail above, it is also desirable to use the same method for fixing the yoke 9 and the rotor shaft 11 by press-fitting, but it is also preferable to apply the same method to parts for various appliances such as kerosene stoves, household appliances such as pots and kettles, and mounting parts such as plates. In addition, there is a method for press-fitting and fixing rod-shaped parts such as handles, knobs, handles, etc., and a method for press-fitting rod-shaped parts such as axles and shaft rods into attachment parts such as wheels and rotating bodies of toy wheels, casters, etc. The same applies to fixing methods such as tape, and methods for press-fitting and fixing rod-shaped parts such as rotating shafts and shaft rods into mounting parts such as frames and parts of various appliances such as tapes and home appliances. It is something.

[Effects of the Invention] As detailed above, the present invention integrally molds a yoke with a boss portion using a transfer press, and ensures the strength, holding force, and squareness of the boss portion during this molding process. For this purpose, the boss portion is formed with a specified rising dimension and wall thickness, and a thick R portion is formed on the inner and outer surfaces of the rising root portion of the boss portion, and furthermore, The outer surface of this R section is made thicker, and the inner surface of the R section is also made thicker by reverse drawing. After molding a mounting part with a boss having a rising root portion having a wall thickness, the boss of the fitting part having a rising dimension having this strength and holding force and a rising root portion having a specified wall thickness is formed. This method involves press-fitting and fixing the rotor shaft into the boss part, so the boss part is configured to reliably hold the rotor shaft with a reliable holding force.
Ultimately, it is possible to improve the strength and accuracy of this rotor shaft. Furthermore, weakening of the press mold can be prevented.

In addition, the yoke with the boss portion is integrally molded using a transfer press, and a reverse drawing process is performed during this molding process, so that the rising root portion has the above-mentioned strength and holding power, and has the specified wall thickness. After molding a mounting part with a boss part having this strength and holding power, the boss part of the mounting part is made into a boss part with a rising dimension having this strength and holding force, and a rising root part having a specified wall thickness. Since the rotor shaft is press-fitted and fixed, there is no need for a bushing, which contributes to simplifying and speeding up the work.

In particular, the boss portion is formed with a specified rising dimension and a specified wall thickness, and a thick R portion is formed on the inner and outer surfaces of the rising root portion of the boss portion, and , the outer surface of this R section is made thicker, and the inner surface of the R section is also made thicker by reverse drawing to achieve the rising dimensions and specifications that have the above-mentioned strength and holding power. After molding a mounting part with a boss having a rising root portion with a wall thickness of Since the rotor shaft is press-fitted into the boss, the perpendicularity and strength of the rotor shaft are fully guaranteed, and this reduces uneven rotation and vibration, making it extremely smooth. Stable rotation is possible. Furthermore, a reduction in noise can also be expected.

[Brief explanation of drawings]

Figures 1 to 11 show an example of the method of the present invention, of which Figures 1 to 8 are schematic diagrams sequentially showing processing steps by transfer press, and Figure 9 is a schematic diagram showing processing steps by transfer press in order.
The figure is an enlarged cross-sectional view of the boss part, Figure 10 is a cross-sectional view of the rotor shaft press-fitted into the yoke, and Figure 11 is a cross-sectional view of the rotor shaft secured to the yoke using the conventional method. be. 1... Board material, 2... Material, 3... Deep container product, 4... Deep container product with flange, 4a...
...Boss bulging piece part, 5...Flanged deep container product with boss part bulging piece part, 5a...Stepped part, 5b...Boss rising part, 5b'...Root part,
6...Flanged deep container product with boss rising part, 7, 10...hole, 8...Deep container product with boss rising part, 9...yoke, 9a...
...Boss part, PB1 to PB6...Top mold, DB1 to DB6
...lower mold.

Claims (1)

[Claims] 1. Board punching, several steps of drawing, forming,
In the process of completing attachment parts such as shafts and rods using a transfer press that performs trimming and inner diameter cutting to obtain finished parts, the attachment parts such as shafts and rods that hold rod-shaped parts such as shafts and rods are In the reverse drawing process to form the provided boss, in order to ensure the predetermined strength and holding power of the boss, the boss is formed with a specified rising dimension and wall thickness. A thick annular R portion is formed on the inner and outer surfaces of the rising root portion of the boss portion.
In addition to making the outer surface of the annular portion thicker, reverse drawing is performed to increase the thickness of the inner surface of the annular R portion. After molding a mounting part with a boss portion having a thick rising root portion,
The rod-shaped parts such as the shaft and rod are press-fitted into the boss part of the mounting part, which has a rising dimension with strong strength and holding power, and a rising root part with a specified wall thickness. Rod-shaped parts such as shafts and rods are integrally molded using a transfer press configured to press-fit and fix rod-shaped parts such as shafts and rods in a direction orthogonal to the mounting parts such as rods. How to fix it.