JP2001328031A - Method of making metal part with protrusion and method of making inertia arm for hdd - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the difficulty of manufacturing a product of high accu racy and high quality and at a low cost ease in the conventional technology of making a metal part with protrusion protruded from the plate-like main body part. SOLUTION: The inertia arm 1 for HDD as a metal part with protrusion is a part made of phosphor bronze integrally formed out of a thin plate-like arm part 2, a weight part 3, and pin parts 4, 5. A material of plate shape in the total thickness or more of the arm part 2 and the weight part 3 is used as the plate-like material, first the weight part 3, the pin parts 4, 5, and three molded recessed parts in an opposite side to these parts are formed by press molding work, second an unnecessary part except a part serving as the arm part 2 in a side of the molded recessed part is cut removed, next when a visible outline of the inertial arm 1 is formed by punch work, the inertia arm 1 of a finished product is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a metal part with a protrusion and a method for manufacturing an inertia arm for an HDD, and more particularly to a method for manufacturing by combining molding, cutting, and punching.

[0002]

2. Description of the Related Art Conventionally, word processors, personal computers, copiers,
Various metal parts are incorporated in OA equipment such as facsimile machines and printers, or various other devices and equipment. Many of these metal parts are made from metal plate materials, so these metal parts include:
A plate-shaped main body having a thickness of about 0.5 to 3.0 mm, and one or more protruding portions (a pin, a shaft, a boss, a cam, and a weight) protruding upright from the outer surface of the main body. , A thick part for forming a hole, etc.).

[0003] A conventional method for producing this kind of metal part will be described. As shown in FIG. 15A, the metal plate material 100 is press-formed to form the protruding portion 100 and the formed concave portion 101 (or while the protruding portion is being formed) and then punched to manufacture a metal part. Techniques are known.
As shown in FIG. 15B, a technique for integrally forming a plate-shaped main body 103 and a protruding portion 104 by forging a metal material for forging is also known.

As shown in FIG. 15 (c), a main body 105 made of metal is manufactured, and a projection 106 separately manufactured is laser-welded to the outer surface of the main body 105, thereby forming the main body 1.
A technique for integrally fixing the protrusion 106 to the projection 05 is also known. As shown in FIG. 15D, the main body 107 made of metal is used.
When the body is manufactured in advance, a hole 108 is formed in the main body 107, a fitting portion 110 formed at the base of the protruding portion 109 is fitted into the hole 108, and the fitting portion 110 is caulked, so that the body A technique for fixing the protruding portion 109 to the portion 107 is also known.

[0005]

As shown in FIG. 15A, in the technique of forming a projection by pressing a plate-shaped material, a solid projection cannot be formed, and the thickness of the main body is reduced. When it is thin, cracks and cracks are likely to occur in the protruding parts, so that high-quality protruding parts cannot be formed, and it can be formed well with metal materials with excellent formability (low carbon steel, copper, aluminum, aluminum alloy, etc.) However, a metal material having poor formability (such as high carbon steel, phosphor bronze, and stainless steel) has a problem that a high-quality protrusion cannot be formed.

As shown in FIG. 15 (b), when the protruding portion is integrally formed by forging, the metal material is limited to a forging metal material having high malleability, and the production error is large due to the influence of thermal strain. There are problems that it is not suitable for manufacturing precision parts, that when the thickness of the main body is thin, cracks and cracks are likely to occur in the main body, and that the manufacturing cost is high.

[0007] As shown in FIG. 15C, when the protruding portion is joined by laser welding, a device for holding the protruding portion and a laser welding machine are required, so that the manufacturing cost is high and the influence of thermal shrinkage is required. There is a problem that the manufacturing error increases and the manufacturing error is not suitable.

As shown in FIG. 15D, when the main body portion is fixed by caulking a protruding portion, it is necessary to form a hole or a fitting portion, and the caulking operation is troublesome, so that the manufacturing cost is high. There is a problem that the manufacturing error is large and is not suitable for manufacturing precision parts, and that the method cannot be applied when the thickness of the main body is thin.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a metal part with a protrusion which can easily form one or a plurality of protrusions on a plate-shaped main body easily at a high precision and at a low cost. HD that can be easily formed with high precision at low cost
An object of the present invention is to provide a method of manufacturing an inertia arm for D.

[0010]

According to a first aspect of the present invention, there is provided a method of manufacturing a metal part with a protruding part, comprising: forming a metal part having a plate-shaped main part and a protruding part protruding from the main part integrally. In the manufacturing method, a plate-shaped material having a thickness equal to or greater than the total thickness of the main body and the projection is press-formed, and a projection protruding from the plate-shaped material, and a plate-shaped material on the opposite side of the projection. A first step of forming a molding recess recessed from an outer surface, and a second step of cutting and removing a portion of the plate-like material on the molding recess side except for a plate-like portion including the main body. And a third step of punching and separating the main body with the projection from the plate-shaped material.

In the first step, a plate-shaped material having a thickness equal to or greater than the total thickness of the main body and the projecting portion is press-formed, and a projecting portion projecting from the plate-like material and a plate-shaped material opposite to the projecting portion are formed. Forming recesses recessed from the outer surface of the material are formed. In the second step, the portion of the plate-like material on the side of the molding recess is cut and removed while leaving the plate-like portion including the main body. In the third step, the main body with the protruding portion is punched from the plate-shaped material and separated.

[0012] Since a plate-shaped material having a thickness equal to or greater than the total thickness of the main body and the protruding portion is used as the plate-shaped material, a solid protruding portion can be formed. The thickness of the main body is 0.
The thickness may be as small as 5 mm, 0.5 to 1.0 mm, several mm, or several tens mm. When forming the protruding portion and the forming concave portion in the first step, the metal material flows in the plate thickness direction, but hardly needs to flow in the direction perpendicular to the plate thickness direction. Various metal materials can be applied as the material. As the metal material, not only various low-carbon steels but also high-carbon steels may be used, and copper, aluminum and brass as well as metal materials having a large Young's modulus such as phosphor bronze, stainless steel and titanium alloy may be used.

[0013] Since the main body and the protruding portion can be formed integrally with the main body by press molding, a high quality protruding portion with a small production error can be formed, and through molding, cutting and punching. Since it can be manufactured, a metal part with a protruding portion can be efficiently and inexpensively manufactured by using a method of simultaneously manufacturing a large number of pieces. There are no restrictions on the thickness of the main body, no restrictions on the shape of the protrusions, and no restrictions on the type of metal material. This increases the degree of freedom in the design of metal members with protrusions, and various protrusions with various structures. Metal parts can be manufactured.

Here, in the first step, in the case where the molding recess is formed so as not to bite into a plate-like portion including the main body of the plate-like material (claim 2), the solid projection is formed. It can be formed to protrude from the main body.

In the case where a plate material having a thickness equal to the total thickness of the main body and the projection is used as the plate material (claim 3), the thickness of the plate material can be minimized. The cutting thickness for cutting in two steps can be minimized.

According to a fourth aspect of the present invention, there is provided a method of manufacturing an inertia arm for a HDD, wherein a thin plate-shaped arm portion, a weight portion and a pin portion projecting from the arm portion are integrally formed.
In a method of manufacturing an inertia arm for DD, a plate-shaped material having a thickness equal to or greater than a total thickness of the arm portion and the weight portion is press-formed, and the weight portion and the pin portion protruding from the plate-shaped material; A first step of forming a plurality of molding recesses respectively recessed from the outer surface of the plate-shaped material on the opposite side of the portion and the pin portion; And a third step of cutting and removing a plate-like portion including a portion, and a punching process and separating an arm portion with a weight portion and a pin portion from the plate-like material. Is what you do.

In the first step, a plate material having a thickness equal to or greater than the total thickness of the arm portion and the weight portion is press-formed, and a weight portion and a pin portion projecting from the plate material; Are formed on the opposite side from the outer surface of the plate-shaped material. In the second step, portions of the plate-like material on the side of the plurality of molding recesses are cut and removed while leaving the plate-like portion including the arm portion. In the third step, the arm portion with the weight portion and the pin portion is punched from the plate-shaped material and separated.

As an example, the specifications of the inertia arm for HDD are as follows: the thickness of the arm portion is 0.7 mm; the height of the weight portion and the pin portion is 1.3 mm; the length of the arm portion is 28 mm;
The diameter of the pin portion is 1.0 mm. As the plate material, for example, a 2.0 mm-thick phosphor bronze plate member (or a 2.0 mm or more-thick phosphor bronze plate member) is applied. However, the above-described various dimensions and types of the metal material are merely examples, and are not limited to these.

Here, the weight portion and the pin portion can be formed in a solid shape in order to apply the plate material having the above-mentioned plate thickness. However, if necessary, a part of the weight part and the pin part may be formed in a solid shape, and the remaining part may be formed in a hollow shape. Since the weight and pin can be formed integrally with the arm by press molding, high-quality weight and pin with little manufacturing error can be formed, and through molding, cutting and punching. Because it can be manufactured, using a method such as simultaneous production of many
The inertia arm for HDD can be efficiently and inexpensively manufactured. There is no restriction on the plate thickness of the arm portion, no restriction on the shape of the weight portion and the pin portion, and no restriction on the type of metal material, so that the degree of freedom in designing the inertia arm for HDD is increased.

Here, in the first step, when the plurality of forming recesses are formed so as not to bite into the plate portion including the arm portion of the plate material (claim 5), the solid weight portion is formed. And the pin part can be formed in a state protruding from the arm part.

Further, when a plate material having a thickness equal to the total thickness of the arm portion and the weight portion is used as the plate material (claim 6), the thickness of the plate material can be minimized. In addition, the thickness of cutting in the second step can be minimized.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a method of manufacturing a phosphor bronze HDD inertia arm in which a thin plate-shaped arm portion, a weight portion and a pin portion protruding from the arm portion are integrally formed. It is.

First, the structure of the inertia arm 1 for HDD made of phosphor bronze will be described with reference to FIG. The inertia arm 1 has a flat, elongated thin plate-like arm portion 2, a weight portion 3 projecting from the upper surface of the base of the arm portion 2, and a pin portion projecting from the middle portion of the arm portion 2 and the upper surface near the tip. 4 and 5 are integrally formed. Regarding the specifications of the inertia arm 1, for example,
The thickness of the arm 2 is 0.7 mm, the height (thickness) of the weight 3 and the pins 4 and 5 is 1.3 mm, and the length of the arm 2 is
The diameter of each of the pin portions 4 and 5 is 1.0 mm.

Next, a method of manufacturing the inertia arm 1 will be described. In the first step, a plate material 6 made of phosphor bronze is prepared. The thickness of the plate material 6 is
The thickness of the arm 2 (0.7 mm) and the height of the weight 3
(Thickness) 2.0 mm thickness equal to the total thickness of (1.3 mm). The plate-shaped material 6 is of a size that can be manufactured by taking a plurality of inertia arms 1 and a plurality of the inertia arms 1. Are formed with a plurality of engagement holes 7. Note that a plate-shaped material 6 having a thickness equal to or greater than the total thickness of the arm 2 and the weight 3 may be applied.

Next, in a second step, as shown in FIGS. 2 to 4, an upper die for press-forming the weight portions 3 and the pin portions 4 and 5 of the plurality of inertia arms 1 is formed. A lower mold is prepared, the lower mold is fixed on a bolster of a press machine, and the upper mold is fixed on a lower surface of a ram of the press machine. Is press-formed, and a weight 3 and pins 4 and 5 projecting from the plate material 6 and an outer surface (a lower surface in the figure) of the plate material 6 on the opposite side of the weight 3 and the pins 4 and 5. A plurality of molded recesses 8, 9, 10 respectively recessed are formed.

FIG. 2 shows the plate-like material 6 after the second step. The plate-like material 6 includes a weight portion 3, a pin portion 4,
5 is formed so as to protrude from the outer surface (the upper surface in the figure) of the plate-shaped material 6. Then, as shown in FIGS. 3 and 4,
On the lower surface side of the plate-shaped material 6, a weight portion 3 and a pin portion 4,
On the side opposite to 5, molding recesses 8, 9, 10 are formed in a concave shape. In the case of the present embodiment, these molding recesses 8, 9, 1
The height (thickness) of 0 is set equal to the height (thickness) of the weight portion 3 and the pin portions 4 and 5, respectively.
10 is formed so as not to bite into a portion to be the arm portion 2.

That is, as shown in FIG. 5 which is an enlarged view of the vicinity of the weight portion 3, the height h1 of the molding recesses 8, 9, 10 is increased.
= 1.3 mm, the height h2 of the weight portion 3 = 1.3 mm, and the thickness h3 from the upper end of the molding recess 8 to the upper surface of the plate-shaped material 6 is:
It is equal to the thickness of the arm 2 (0.7 mm).
Note that a two-dot chain line 11 in FIG. 5 indicates a plane corresponding to the lower surface of the arm 2.

Next, in a third step, as shown in FIGS. 6 and 7, the forming recesses 8, 9, 10 of the plate-like material 6 are formed.
The side portion (lower surface side portion) is cut and removed while leaving the plate-like portion 12 including the arm portion 2. In this case, the cutting zone corresponding to each set of inertia arms 1 is a region between a pair of dotted lines 13 in FIG. 6 and up to the height of a two-dot chain line 11 shown in FIG. To cut. By this cutting, a shallow groove 14 is formed on the lower surface side of the plate-shaped material 6 (see FIG. 7).

Next, in a fourth step, as shown in FIGS. 8 and 9, the plate material 6 after the third step is set on a press machine, and the weight portion 3 and the pin are removed from the plate material 6. The arm part 2 with the parts 4 and 5 is punched and separated.
In this case, a pair of upper and lower punching dies (punch and die) capable of punching the outline of the plurality of inertia arms 1.
Is mounted on a press machine, and a plurality of sets of inertia arms 1 are punched by a punching die. FIG. 8 shows the plate material 6 after punching, and a punched hole 15 remains in the plate material 6 after punching. FIG. 9 shows the stamped finished inertia arm 1.

Here, the weight 3 and the pins 4 and 5 are formed in a solid shape in order to apply the plate-like material 6 having the above-mentioned thickness and perform the above-mentioned forming and cutting. . Since the weight portion 3 and the pin portions 4 and 5 can be integrally formed with the arm portion 2 by press molding, it is possible to form the high-quality weight portion 3 and the pin portions 4 and 5 with little manufacturing error.
A high quality inertia arm 1 can be manufactured.
In addition, since it can be manufactured by a processing technique that combines molding, cutting, and punching, the inertia arm 1 for HDD can be efficiently and inexpensively manufactured by using a method of simultaneously manufacturing a large number of pieces.

There is no restriction on the thickness of the arm 2 and no restrictions on the shapes of the weight 3 and the pins 4 and 5. In addition, when the weight portion 3, the pin portions 4, 5 and the forming recesses 8, 9, 10 are formed, the metal material flows in the plate thickness direction, but it is almost necessary to flow in the direction perpendicular to the plate thickness direction. Because there is no
Various metal materials can be applied as the metal material forming the plate-shaped material 6. As described above, since there is no restriction on the plate thickness, the shape of the weight portions 3 and the pin portions 4 and 5, or the type of metal material, the degree of freedom in designing the inertia arm 1 for the HDD increases.

Here, in the second step, since the plurality of forming recesses 8, 9, and 10 are formed so as not to bite into the plate-like portion 12 including the arm portion 2 of the plate-like material 6, a solid state is formed. The weight portion 3 and the pin portions 4 and 5 can be formed so as to protrude from the arm portion 2. Further, since the plate material 6 having a thickness equal to the total thickness of the arm portion 2 and the weight portion 3 is used as the plate material 6, the thickness of the plate material 6 can be minimized. The cutting thickness to be cut in the process can be minimized.

Here, the phosphor bronze HDD described above is used.
The method for manufacturing an inertia arm for a vehicle can be applied to various methods for manufacturing metal parts with protrusions, and the metal part with a protrusion according to claim 1 is an inertia arm for HDD made of phosphor bronze. 1, the arm portion 2 corresponds to the main body portion, the weight portion 3 or the pin portions 4 and 5 correspond to the protruding portion, and the molding concave portion 8 or the molding concave portion 9 corresponds to the molding concave portion. , 10.

Next, a description will be given of a modification in which the above-described embodiment is partially modified. 1) In the above embodiment, the case where the present invention is applied to the method of manufacturing the inertia arm 1 for HDD made of phosphor bronze has been described as an example.
Various metal parts of various OA equipment, various metal parts of other devices and equipment, and a metal-made part having a plate-shaped main body and a protrusion protruding from the main body are integrally formed. The present invention can be similarly applied to a manufacturing method. The thickness and shape of the main body, the metal material forming the plate-like material, and the number, height and shape of the protrusions are not limited to those described above.

2) As shown in FIGS. 10 and 11, it is also possible to manufacture a metal part 20 having a plate-shaped main body 21 and a plurality of protrusions 22 and 23 having different heights. In this case, in the second step, as shown in FIG. 12, the plate material 24 is press-formed by press forming to form the protruding portions 22, 23 and the formed concave portions 25, 26.
In the third step, cutting is performed while leaving a plate-shaped portion including the plate-shaped main body 21. In this case, the zone below the two-dot chain line 27 in FIG.
Is removed by cutting to form a plate-like portion including the main body 21. In the fourth step, the metal component 2
The metal part 20 is manufactured by stamping out the outer shape line 30 of zero.

Here, a metal part 20 as shown in FIG.
When manufacturing the metal part 20A having a bent shape, the bent part 3 of the metal part 20 is formed after the fourth step is completed.
What is necessary is just to perform the shaping | molding process which makes 1 bend.

However, in the case where a plurality of metal parts 20 are manufactured at the same time, if a plurality of metal parts 20 are disintegrated, the subsequent forming process becomes troublesome.
When punching out the outer shape line 30 of the above, a part of the outer shape line 30 in each metal part 20 is punched out in a state where it is not divided, and in the next fifth step, a forming process of bending the bent parts 31 of the plurality of metal parts 20 is performed. After that, in a sixth step, a plurality of metal parts 20A are finally punched out of the plate-shaped material 24 and cut.

Even when the main body of the metal part is bent in various shapes in the out-of-plane direction, the necessary forming process for bending the main body in the fifth step is performed in the same manner as described above. Then, the last punching process may be performed in the sixth step.

[0039]

According to the first aspect of the present invention, since the main body and the protruding portion can be formed integrally with the main body by press molding, a high-quality protruding portion with less manufacturing error can be formed. Since solid protruding parts can be formed and can be manufactured through molding, cutting and punching, metal parts with protruding parts can be manufactured efficiently and inexpensively by using a method such as simultaneous production of many pieces. Can be manufactured. There are no restrictions on the thickness of the main body, no restrictions on the shape of the protrusions, and no restrictions on the type of metal material. This increases the degree of freedom in the design of metal members with protrusions, and various protrusions with various structures. Metal parts can be manufactured.

According to the second aspect of the present invention, in the first step, since the molding recess is formed so as not to bite into the plate-like portion of the plate-like material including the main body, a solid projection is formed. The portion can be formed to protrude from the main body. Other effects are the same as those of the first aspect.

According to the third aspect of the present invention, since the plate material having a thickness equal to the total thickness of the main body and the projection is used as the plate material, the thickness of the plate material can be minimized. It is possible to minimize the thickness to be cut in the second step. The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, by appropriately setting the thickness of the plate-shaped material, the weight portion and the pin portion can be formed in a solid shape. Since the weight and pin can be formed integrally with the arm by press molding, high-quality weight and pin with little manufacturing error can be formed, and they can be manufactured through molding and cutting. ,
The inertia arm for HDD can be efficiently and inexpensively manufactured by using a method of simultaneously manufacturing a large number of HDDs. There is no restriction on the plate thickness of the arm portion, no restriction on the shape of the weight portion and the pin portion, and no restriction on the type of metal material. Therefore, the degree of freedom in designing a metal member with a protrusion is increased.

According to the fifth aspect of the present invention, in the first step, the plurality of forming recesses are formed so as not to bite into the plate-like portion including the arm portion of the plate-like material. The weight portion and the pin portion can be formed so as to protrude from the arm portion. The other effects are the same as those of the fourth aspect.

According to the sixth aspect of the present invention, since the plate-like material having a thickness equal to the total thickness of the arm and the weight is used as the plate-like material, the thickness of the plate-like material can be minimized. It is possible to minimize the thickness to be cut in the second step.

[Brief description of the drawings]

FIG. 1 is a perspective view of an inertia arm for an HDD according to an embodiment of the present invention.

FIG. 2 is a plan view of a plate-like material in which a weight portion and a pin portion are formed in a second step.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a view taken in the direction of the arrow IV in FIG. 2;

FIG. 5 is an enlarged sectional view in which a part of FIG. 3 is enlarged.

FIG. 6 is a plan view of a plate-like material that has been cut in a third step.

FIG. 7 is a view taken in the direction of the arrow VII in FIG. 6;

FIG. 8 is a plan view of a plate-shaped material subjected to a punching process in a fourth step.

FIG. 9 is a plan view of an inertia arm for HDD.

FIG. 10 is a plan view of a metal component according to a modification.

FIG. 11 is a front view of the metal component of FIG. 10;

FIG. 12 is a cross-sectional view of a plate-like material formed and processed in a second step for manufacturing the metal parts shown in FIGS. 10 and 11;

FIG. 13 is a plan view of the plate-shaped material shown in FIG.

FIG. 14 is a front view of a metal part according to a modification.

FIG. 15 is a cross-sectional view of a metal component according to the related art;
(A) sectional view of a metal part formed by press forming,
(B) is a sectional view of a metal part formed by forging.
(C) is a cross-sectional view of the metal part having the protrusions welded thereto,
(D) is sectional drawing of the metal component which fixed the protrusion part by caulking.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inertia arm for HDD (metal part) 2 Arm part (body part) 3 Weight part (projection part) 4,5 Pin part (projection part) 6 Plate material 8-10 Forming recess 12 Plate part 20, 20A Metal part 21 body part 22, 23 projecting part 24 plate material

Claims (6)

[Claims] 1. A method of manufacturing a metal part with a protruding portion in which a plate-shaped main body portion and a protruding portion protruding from the main body portion are integrally formed, wherein a thickness of the main body portion and the protruding portion is equal to or more than a total thickness. A step of press-forming the plate-shaped material to form a projection projecting from the plate-shaped material, and a molding recess recessed from the outer surface of the plate-shaped material on the opposite side of the projection; A second step of cutting and removing a portion of the plate-shaped material on the side of the forming recess while leaving a plate-shaped portion including the main body, and punching and separating a main body with a projection from the plate-shaped material. A method of manufacturing a metal part with a protrusion, comprising: a third step. 2. The method according to claim 1, wherein, in the first step, the molding recess is formed so as not to bite into a plate-shaped portion including the main body of the plate-shaped material. Manufacturing method of metal parts. 3. The method for manufacturing a metal component according to claim 1, wherein a plate-shaped material having a thickness equal to a total thickness of the main body and the protruding portion is used as the plate-shaped material. 4. A method of manufacturing a metal inertia arm for a HDD in which a thin plate-shaped arm portion, a weight portion and a pin portion protruding from the arm portion are integrally formed, wherein a total thickness of the arm portion and the weight portion is provided. Press-forming a plate-shaped material having a thickness greater than or equal to the thickness, the weight portion and the pin portion protruding from the plate-shaped material, and a plurality of concave portions respectively recessed from the outer surface of the plate-shaped material on the opposite side of the weight portion and the pin portion. A first step of forming a molding concave part, and a part of the plate-like material on the side of the plurality of molding concave parts,
A second step of cutting and removing the plate portion including the arm portion while leaving the plate portion; and a third step of punching and separating an arm portion with a weight portion and a pin portion from the plate material. A method of manufacturing an inertia arm for HDD, characterized by comprising: 5. The method according to claim 4, wherein in the first step, the plurality of forming recesses are formed so as not to bite into a plate-like portion including the arm portion of the plate-like material.
3. The method for producing a metal part with a protrusion according to claim 1. 6. The method according to claim 4, wherein a plate material having a thickness equal to a total thickness of an arm portion and a weight portion is used as the plate material.