JPH11156462A - Manufacture of cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the dimensional accuracy and to reduce the manufacturing cost of a cylindrical body while easily manufacturing it at the time of manufacturing the cylinder body. SOLUTION: A cylindrical body 1 is manufactured by successively passing through a first step to form a pair of magnetic metallic late stocks 21 , 22 where an expansion part 5 which is consecutively formed on a same face with one surface 4a of a plate stock base part 4 and has the thickness of one half of the thickness of the plate stock base part 4 is successively provided to the both end parts along one direction 6 of the rectangular plate stock base part 4, a second step to form a pair curved stocks 31 , 32 by pressing the both plate stocks 21 , 22 in a semi-cylindrical shape where the one direction 6 is made to the circumferential direction so that each expansion part 5 is located on the both end sides in the circumferential direction and one surface 4a of the both plate stock base part 4 is opposite to each other in the out-in direction and a third step where both ends in the circumferential direction of the both curved stocks 31 , 32 are welded to each other in the state that the expansion parts 5 present at the both ends in the circumferential direction of the curved stocks 31 , 32 are fitted to each other in a spigot joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a cylindrical body such as a motor frame.

[0002]

2. Description of the Related Art Conventionally, when manufacturing such a cylindrical body, there are a type in which a pipe is appropriately cut and a type in which a plate-like material is processed into a cylindrical shape.

[0003]

However, in the case of cutting a pipe, a cylindrical body having excellent dimensional accuracy can be manufactured, but a large number of processing steps and processing time are required, which leads to an increase in manufacturing cost. Will be. When the plate-like material is processed into a cylindrical shape, the manufacturing cost can be reduced, but the roundness and the dimensional accuracy of the cylindrical body must be reduced.

[0004] The present invention has been made in view of the above circumstances, and is a method of manufacturing a cylindrical body that can be easily manufactured and that can improve dimensional accuracy and reduce manufacturing cost. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a plate material base having a right-angled quadrilateral plate material base at both ends along one direction and connected to one surface of the plate material base. A first step of forming a pair of magnetic metal plate materials each having a half thickness of and extending outwardly along the one direction, and forming a pair of magnetic metal plate materials; The two directions are opposite to each other so that the one direction is the circumferential direction and one surface of the base of one plate is the outer surface, while the other surface of the base of the other plate is the inner surface. A second step of forming a pair of curved materials by press working into a semi-cylindrical shape on both sides, and circumferentially opposite ends of the bi-curved material in a state where the overhanging portions at both ends in the circumferential direction of the bi-curved material are fitted with each other. 3rd welding to each other
The steps are sequentially performed to produce a cylindrical body.

According to such a manufacturing method, the first step of forming a pair of plate materials, the second step of forming a pair of curved materials by pressing a pair of plate materials, and welding the two curved materials to each other are performed. The cylindrical body can be easily and inexpensively manufactured only by sequentially passing through the third step. In addition, the curvature radius of the outer surface of the bi-curved material is the outer radius of the cylindrical body, and the bi-curved material can be pressed while correcting the curvature radius of the inner and outer surfaces thereof. Since the inner and outer radii of the cylindrical body can be controlled by the peripheral length of the material, the dimensional accuracy of the cylindrical body can be improved. Furthermore, since the circumferential ends of the bi-curved material are welded to each other, no air gap is formed between the circumferential ends of the bi-curved material, and the magnetic loss in the cylindrical body can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is an explanatory view of a manufacturing process of a motor frame, and FIG. 2 is a plan view of a plate material.

First, referring to FIG. 1, a motor as a cylindrical body
The frame 1 is made of a pair of plate materials 2 made of a magnetic metal.₁, 2
_TwoFirst step of forming a two-plate material 2₁, 2_TwoNo
A pair of curved materials 3 by less processing₁, 3_TwoForming the first
2 steps and bi-curved material 3 ₁, 3_TwoThe mutual inlay
The third step of fitting and welding
It is manufactured by

Referring to FIG. 2 as well, in a first step, a pair of plate materials 2 ₁ and 2 ₂ are formed, and these plate materials 2 ₁ and 2 ₂ are formed of a rectangular quadrilateral plate material. The projecting portions 5 and 5 are continuously provided at both ends along the one direction 6 of the base 4, and the projecting portions 5 and 5 are connected to the plate material base 4.
Is formed having with continuous flush on one surface 4a of the thickness t ₂ of the half of the thickness t ₁ of the blank plate base 4 of such overhangs on both outward along the direction 6. In the first step,
Positioning projections 7, 7 are formed at both ends of the plate materials 2 ₁ , 2 ₂ along the direction orthogonal to the one direction 6 at the center in the direction along the one direction 3, respectively.

In the second step, the two plate materials 2 ₁ , 2
₂ press working to the pair of curved elements 3 ₁ is a semi-cylindrical, 3 ₂ but is in the range form a curved material 3 ₁ whereas one of the plate material 2 ₁ are formed by press working, both The one direction 6 is set as the circumferential direction so that the overhang portions 5 and 5 are located at both ends in the circumferential direction, and the one surface 4a of the plate material base 4 is provided.
There is formed in such a manner that the outer surface side into a semi-cylindrical shape, and the other plate material 2 _2-pressed other curved material 3 ₂ thus formed is, in both overhang 5,5 circumferential direction end sides It is formed in a semi-cylindrical shape such that the one direction 6 is a circumferential direction and one surface 4a of the plate material base 4 is located on the inner surface side.

In the third step, the bi-curved materials 3 ₁ , 3 ₂
In the second step, one of the curved materials 3 is formed.
To overhang 5,5 circumferential end of ₁ that continuous flush to the outer surface, both curved material such overhang portions 5 of the circumferential ends of the other curved elements 3 ₂ connected to flush the inner surface 3 _1, 3 ₂ are formed. Therefore, the projecting portions 5, 5... At both ends in the circumferential direction of the bi-curved materials 3 ₁ , 3 ₂ are fitted into each other by inlaying, so that the bi-curved materials 3 ₁ , 3
₂ are assembled in a cylindrical shape, and in this state, the circumferentially opposite ends of the bi-curved materials 3 ₁ and 3 ₂ are welded over the entire length in the axial direction, whereby the cylindrical motor frame 1 is manufactured. . At this time, the two curved materials 3 ₁ ,
3 before or after welding for welding together _two circumferential ends, of the motor frame 1, and the outer diameter precision both curved elements 3 ₁ in order to improve, 3 ₂ mating surfaces so as to correct the cylindrical Is also good.

[0013] Next, to explain the action of this embodiment, in manufacturing the motor frame 1, pressing the pair of plate material 2 _1, 2 ₂ first step of forming a pair of plate material 2 _1, 2 ₂ And a pair of curved materials 3 ₁ , 3 ₂
Second step for forming the material, as well as the bi-curved materials 3 ₁ , 3
_Since the motor frame 1 is manufactured only by sequentially passing through the third step of welding ₂ to each other,
The motor frame 1 can be easily and inexpensively manufactured.

[0014] In addition, the double curved material 3₁, 3_TwoInside and outside
The radius of curvature is the outer radius of the cylindrical motor frame 1
In the second step, a bi-curved material
3₁, 3 _TwoInside while correcting the radius of curvature of the outer surface.
Can be processed, and the material 2₁, 3_TwoLap of
The outer radius of the motor frame 1 can be managed by the length.
As a result, the dimensional accuracy of the motor frame 1 is excellent.
can do.

Further, the both curved materials 3 ₁ , 3 ₂ are welded to each other in the circumferential direction, so that the curved materials 3 ₁ , 3 ₂ are welded to each other.
No air gap is formed between both ends in the circumferential direction of the motor frame 1, and magnetic loss in the motor frame 1 can be suppressed to a small value.

Before forming the curved materials 3 ₁ , 3 ₂ , the plate materials 2 ₁ , 2 ₂ are located at both ends along a direction orthogonal to the one direction 6, at central portions in the direction along the one direction 6. By forming the positioning projections 7 in such a manner as described above, the positioning of the bi-curved materials 3 ₁ , 3 ₂ at the time of joint welding of the bi-curved materials 3 ₁ , 3 ₂ and the use of the motor frame 1 are performed. The positioning protrusions 7, 7,... Can be used for positioning the motor frame 1 when assembling the motor, thereby increasing the degree of freedom in design.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, a cylindrical motor frame has been described, but the present invention is widely applicable as a method for manufacturing a cylindrical body.

[0019]

As described above, according to the present invention, a step of forming a pair of plate materials, a step of forming a pair of curved materials by pressing a pair of plate materials, and welding the both curved materials to each other. A cylindrical body can be easily and inexpensively manufactured by manufacturing a cylindrical body only by sequentially passing through the steps, and press processing of both curved materials while correcting a curved radius of an outer surface thereof. Can be
In addition, since the inner and outer radii of the cylindrical body can be controlled by the circumferential length of the two curved materials, the dimensional accuracy of the cylindrical body can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a manufacturing process of a motor frame.

FIG. 2 is a plan view of a plate material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS ₁ ... Motor frame as a cylindrical body 2 ₁ and 2 ₂ ... Plate material 3 ₁ and 3 ₂ ... Curved material 4 ... Plate material base 4a ... One surface of plate material base 5 ... Overhang part 6: One direction

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI // H02K 5/04 H02K 5/04 15/14 15/14 Z

Claims (1)

[Claims] 1. One side (4) of a plate material base (4) at both ends along one direction (6) of a right-angled quadrilateral plate material base (4).
a) a pair of magnetic members each of which is provided with an overhanging portion (5), which is continuous with the surface of (a) and has a thickness half that of the plate material base (4), and which extends outward along the one direction (6). A first step of forming a metal plate material (2 ₁ , 2 ₂ ); one direction (6) is set as the circumferential direction so as to position each overhang portion (5) at both ends in the circumferential direction; The two plate materials (2 ₁ , 2 ₂ ) are mutually connected such that one surface (4a) of the material base (4) is on the outer surface side, but one surface (4a) of the other plate material base (4) is on the inner surface side. A second step of forming a pair of curved materials (3 ₁ , 3 ₂ ) by pressing in a semi-cylindrical shape in opposite directions, and extending portions ( ₂ , 3) at both circumferential ends of the curved materials (3 ₁ , 3 ₂ ) both curved material 5) mutually in a state that allowed spigot fitting (3 _1, 3 ₂₎ third stearyl welding circumferential ends to each other of Sequentially allowed elapsed and up method for producing a cylindrical body, characterized in that to produce a cylindrical body (1).