JPH09289116A - Manufacture of cylindrical stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a highly accurate cylindrical stator excellently in yield by gradually narrowing down a plate piece, which is curved in advance into a C shape close to the final form, in two stages by a simple constitution of press-fitting jig and a split collar. SOLUTION: A laminate 13 where many C-shaped plate pieces 12 having high permeability and being equal in thickness to each other are arranged in a spiral form is made. Then, this laminate 13 is inserted into a resinous split collar 14 capable of contraction in the radial direction. Next, the laminate 13 inserted into the split collar 14 is press-fitted while being narrowed down into a metallic fixing ring 23. Next, the top and bottom end faces of the laminate 13 within the metallic fixing ring 23 is fixed by laser welding. Next, it is pressed with a press 40 and the laminate 13 is slid a little from the metallic fixing ring 23, and is inserted into a two-piece ring 42 and a bottom ring 43. Then, the two-piece ring 42 is split and the periphery of the cylinder of the laminate 13 is exposed and it is fixed by laser welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cylindrical stator in which plate pieces used for an electromagnetic solenoid are spirally arranged.

[0002]

2. Description of the Related Art As a conventional method for manufacturing a cylindrical stator, a method disclosed in Japanese Patent Laid-Open No. 6-176921 is known. The details are as described below. In the conventional method for manufacturing a cylindrical stator, the J-shaped pre-curved plate pieces are first arranged in a spiral shape, and then the pressing portion presses the outer ends of the plate pieces in the diameter reducing direction. At least the inner end portion of the piece is rotated relative to the pressing portion in the spiral direction. In this case, the outer end of each plate piece, that is, the portion in contact with the pressing portion may be stationary relative to the pressing portion or may be rotated relative to the pressing portion.

In this way, the spirally wound cylindrical stator can be manufactured easily and with good finish. That is, when the spirally arranged plate pieces are pressed in the radial contraction direction, a compressive component force in the longitudinal direction of each plate piece is generated from this pressing force. If the inner ends of the plate pieces are not displaceable, the compressive component force may cause the plate pieces to be distorted in an undesired direction. According to this method, at least the inner end portion of each plate piece is rotatable relative to the pressing portion in the spiral direction, so that the inner end portion of each plate piece escapes in the spiral direction against such a compression component force. It is possible to prevent the plate piece from being distorted in an undesired direction.

Further, the inner end of each plate piece escapes inward in the spiral direction, so that the inner end of each plate piece can be reduced in diameter, and the spiral shape of each plate piece before being pressed by the pressing portion. In the arrangement, the inner ends of the plate pieces can be easily arranged in a circumferential shape. In a preferred embodiment, if each plate piece is bent in advance to have a substantially parabolic shape, the inner end of each plate piece can be easily wound inward in the spiral direction.

In carrying out the above-described manufacturing method, this cylindrical stator manufacturing apparatus places each plate piece on a rotatable rotary table. In this way, compared to the case of a fixed table, the rotary table is rotated by the component force when pressing each plate piece in the diameter reducing direction by the pressing portion, and each plate piece is rolled inward in the spiral direction. Can be easy,
It is possible to prevent undesired distortion of each plate piece described above.

[0006]

The conventional manufacturing method is as follows.
Suitable for manufacturing relatively large diameter cylindrical stators,
When the application to small engines is increased and it is attempted to manufacture a small-diameter cylindrical stator by the manufacturing method of the conventional example, when the diameter of the J-shaped plate piece is reduced by the pressing force, the change in curvature is very large. Even if they are relatively rotated using a large-scale rotary table, the J-shaped plate repels so much force that it tries to return to its original shape, and it is distorted into an undesired shape, resulting in a small-diameter cylindrical shape. It was very difficult to manufacture the stator with high yield.

The present invention does not generate a large repulsive force when the diameter is reduced, does not require a large-scale device such as a rotary table as in the prior art, and has a cylindrical shape of a desired shape by a press-fitting jig having a simple structure. The purpose is to manufacture a stator.

[0008]

In order to achieve the above object, the present invention employs a manufacturing method according to claim 1. In the present invention, a plate piece preliminarily curved to a C shape close to the final shape of deformation is used, and the diameter is gradually reduced in two steps of the first step and the second step, so that a large repulsive force is generated. Moreover, unlike the conventional case, a large-scale device such as a rotary table is not required, and a cylindrical stator having a desired shape can be manufactured with high yield by a press-fitting jig and a split collar having a simple structure. Further, since the welding is laser welding, the penetration depth is just right and a highly accurate cylindrical stator can be manufactured.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings in accordance with manufacturing procedures. 1 to 6 show a laminate 13 in which a large number of C-shaped plate pieces 12 having a high magnetic permeability and having the same thickness are arranged in a spiral shape is inserted into a resin split collar 14 capable of contracting in the radial direction. It relates to the first step of

FIG. 1 is a perspective view showing a situation where a flat plate piece 1 is set on a processing jig. First, as shown in FIG. 1, a flat plate piece 1 of, for example, a silicon steel plate having high magnetic permeability is sandwiched between a male die 2 and a presser 3 and set in a female die 4. FIG. 2 is a perspective view showing a situation of press working when the flat plate piece 1 is molded into the J-shaped plate piece 11. Here, FIG. 2A shows a jig setting state during press working, and FIG. 2B shows a J-shaped plate piece obtained by the press working.

Next, as shown in FIG. 2, the male die 2 is pressed by a press 5 to bend the flat plate piece 1 into a J-shaped plate piece 11. FIG. 3 is a perspective view showing a situation in which the J-shaped plate piece 11 is set on a processing jig. And J
The shaped plate piece 11 is set on the male mold 8 by the female mold 6 and the pressing member 7 shown in FIG.

FIG. 4 shows a J-shaped plate piece 11 as a C-shaped plate piece 1.
It is a perspective view which shows the state of press processing at the time of shape | molding to 2. Here, FIG. 4A shows a jig setting condition during press working, and FIG. 4B shows a C-shaped plate piece 12 obtained by press working. Next, as shown in FIG. 4A, the female die 6 is pressed by the press 9 to bend the J-shaped plate piece 11 into the C-shaped plate piece 12.

In the conventional example, a cylindrical stator is manufactured using a J-shaped plate piece 11 as a starting material, whereas in the present invention, a bending process is performed to a C-shape closer to the final shape, and then the next step is performed. Therefore, a small-diameter cylindrical stator can be easily realized with a slight pressing force. The above is the method for manufacturing the C-shaped plate piece. FIG. 5 is a perspective view showing constituent members in a first step of inserting a laminate 13 in which C-shaped plate pieces 12 are arranged in a spiral shape into a resin-made split collar 14 capable of contracting in a radial direction. .

Next, as shown in FIG. 5, a desired number of C-shaped plate pieces 12 are stacked and arranged, and temporarily assembled to form a laminate 13. FIG. 6 relates to the pressing of the laminate 13 into the split collar 14 made of resin, and FIG.
Is a cross-sectional view showing a jig for inserting the laminate 13 into the split collar 14 and its arrangement, and FIG.
3 is a sectional view of a laminate subassembly 20 in which 3 is inserted into a split collar 14. FIG.

The laminate 13 is inserted into a resin-made split collar 14 for facilitating the subsequent diameter reduction step. The split collar 14 is made of resin and has good lubrication, and is a member used to make a diagonal cut in the cylinder to allow radial contraction. Here, the notch is made diagonally,
C-shaped plate piece 1 on the outer periphery of the laminate 13 during the diameter reduction process
This is because the end face of 2 does not interfere with the split collar 14 to cause a problem such as bending. Therefore, this cut may not be oblique unless it is parallel to the end face of the C-shaped plate piece 12 on the outer peripheral portion of the laminate 13.

In FIG. 6, the laminate 13 is set on the upper portion of the cylindrical body 15 as shown in FIG.
The split collar 14 is installed below the lower taper portion 17. Then, the press 16 presses the laminate 13 from above, and the taper portion 17 provided on the body 15 reduces the diameter.
Insert into split collar 14. At this time, if the laminate 13 is impregnated with the lubricating oil, the diameter reducing step becomes easier. FIG. 6B shows the laminate subassembly 20 with the laminate 13 inserted in the split collar 14.

FIG. 7 shows this laminate subassembly 20.
FIG. 7 (a) shows a jig for reducing the diameter to the final size by press-fitting into the metal fixing ring while reducing the diameter. The jig is composed of two parts and is a combination of an upper mold 21 and a lower mold 22. Each mold is provided with a cylindrical guide hole. The laminate subassembly 20 is set on the upper side, and the metal fixing ring 23 is set on the lower side. When pressure is applied by the press 24, the laminating subassembly 20 is reduced in diameter by the upper guide hole 25 and stopped by the stopper portion 26. Next, the laminate 13 is guided to the lower guide hole 27 while pressing only the laminate 13 and removing it from the split collar 14. The pressurization is continued as it is by the press 24, and the laminate 13 is inserted into the metal fixing ring 23.

FIG. 7B is a vertical sectional view of the laminate assembly 30 in which the laminate 13 is inserted into the metal fixing ring 23. FIG. 8 relates to a third step of fixing the upper and lower end surfaces of the laminate 13 in the metal fixing ring by laser welding, and FIGS. 8 (a), 8 (b) and 8
(C) is a top view which shows the welding pattern of each end surface.

FIG. 8 shows a method of fixing the end surface of the laminate 13 molded into a desired shape. First, the upper and lower end surfaces are fixed by laser welding while being inserted into the metal fixing ring 23. The laser welding method is shown in FIG.
8 (b) and 8 (c), it is possible to prevent the plate pieces from being displaced. FIG. 8 (a) shows a plurality of concentric laser welds, FIG. 8 (b) shows a spiral laser weld, and FIG. 8 (c) shows a cross laser weld. It is a thing. Alternatively, if laser welding is performed using a combination of these, the fixation is still reliable.

FIG. 9 relates to the fourth step of exposing the outer periphery of the cylindrical portion of the laminate 13 by the two-divided ring 42 and fixing it by laser welding.
9 (b1), FIG. 9 (b2), FIG. 9 (c), and FIG. 9 (d) show the arrangement of jigs during processing. As shown in FIG. 8, a laminate 13 whose upper and lower end surfaces are laser-welded
As shown in FIG. 9 (a) with the metal fixing ring 23 still in place, the guide 41 is set, and the split ring 4
2 and the bottom ring 43 are set and then pressed by the press 40, the laminate 13 is slightly slid from the metal fixing ring 23, and then the two divided rings 42 and the bottom ring 43 are inserted as shown in FIG. 9 (b1). insert. Here, since the two-divided ring 42 can be separated into two at the center as shown in FIG. 9 (b2), a part of the ring 13 is left in a state where the outer peripheral portion of the laminate 13 is fixed as shown in FIG. 9 (c). Can be exposed. The entire circumference of the exposed portion 44 is fixed by laser welding to prevent the laminate 13 from spreading to the outer peripheral portion. After the laser welding, as shown in FIG. 9D, the press 4 is pressed through the hole in the center of the bottom ring 43.
5, the laminate 13 is fixed to the metal fixing ring 2 by pressing.
Put back in 3.

The above operation is carried out by turning the laminate 13 upside down, and the other outer peripheral portion is also laser-welded and fixed. Then, the laminate 13 fixed by laser welding is taken out from the metal fixing ring 23 to obtain a cylindrical stator. Through the above series of steps, it becomes possible to manufacture a cylindrical stator manufactured by subjecting the laminate 13 to laser welding.

FIG. 10 shows an injection valve using a small solenoid 50 manufactured by the method for manufacturing a cylindrical stator of the present invention. In FIG. 10, high-pressure fuel is introduced from an inlet 51 and is introduced into an oil reservoir (not shown) of a known nozzle 52. The needle 60 of the nozzle 52 is connected to the command piston 53 via the push rod 59. High-pressure fuel is introduced into the back pressure chamber 54 above the command piston 53 through the IN orifice 55, and communicates with the control port 61 of the valve 57 through the OUT orifice 56.

The valve 57 is biased downward by a spring 62, but when the small solenoid 50 is energized, the valve 57 is sucked upward, the control port 61 communicates with the drain port 58, and the pressure in the back pressure chamber 54 is reduced. The command piston 53, the push rod 59, and the needle 60 are all lowered upward, and the injection is started. When the small solenoid 50 is de-energized, the valve 57 opens the spring 62.
Then, the control port 61 and the drain port 58 are shut off, the pressure in the back pressure chamber 54 rises, the needle 60 descends, and the injection ends.

According to the present invention, the plate piece preliminarily curved to a C shape close to the final shape is used in the first step and the second step.
Since the diameter is gradually reduced through the two steps of the process, a large repulsive force does not occur, a device such as a large-scale rotary table is not required unlike the conventional example, and a press-fitting jig with a simple structure is used. With the split collar, there is an effect that a cylindrical stator having a desired shape can be manufactured, and a small injection valve incorporating a small solenoid using this can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view relating to a first step and showing a situation in which a flat plate piece 1 is set on a processing jig.

FIG. 2 relates to the first step, and is a perspective view showing a state of press working when the flat plate piece 1 is molded into a J-shaped plate piece 11, and FIG. The jig setting situation is shown, and (b) shows a J-shaped plate piece obtained by press working.

FIG. 3 is a perspective view relating to the first step and showing a situation in which a J-shaped plate piece 11 is set on a processing jig.

FIG. 4 relates to the first step, and is a perspective view showing a situation of press working when the J-shaped plate piece 11 is molded into the C-shaped plate piece 12, and FIG. The jig setting state is shown, and (b) shows a C-shaped plate piece 12 obtained by press working.

FIG. 5 relates to the first step, in which a laminate 13 in which C-shaped plate pieces 12 are arranged in a spiral shape is inserted into a resin-made split collar 14 capable of shrinking in the radial direction.
It is a perspective view which showed the structural member of the process of.

FIG. 6 relates to the first step, laminating 1
FIG. 3 relates to pushing into the split collar 14 made of resin. FIG. 3A is a sectional view showing a jig for inserting the laminate 13 into the split collar 14 and its arrangement, and FIG. FIG. 4 is a sectional view of the laminate subassembly 20 inserted into the collar 14.

FIG. 7 relates to the second step, (a) is a jig for reducing the diameter to the final size, and (b) is a laminate assembly 30 in which the laminate 13 is inserted into a metal fixing ring 23. FIG.

FIG. 8 relates to the third step, (a),
(B), (c) is a top view which shows the welding pattern of an end surface, respectively.

FIG. 9 relates to the fourth step, and includes (a) and (b).
1), (b2), (c), and (d) show the arrangement of jigs in processing, respectively.

FIG. 10 is a vertical cross-sectional view showing an injection valve using a small solenoid 50 manufactured by the method for manufacturing a cylindrical stator of the present invention.

[Explanation of symbols]

 12 C-shaped plate piece 13 Laminate 14 Split collar 23 Metal fixing ring 42 2 split ring

Claims (1)

[Claims] 1. A large number of Cs having a high magnetic permeability and having the same thickness as each other.
The first step of inserting the laminate in which the shaped plate pieces are arranged in a spiral shape into the resin split collar capable of shrinking in the radial direction, and the laminate inserted in the split collar to the metal fixing ring. The second step of press-fitting while reducing the diameter,
A third step of fixing the upper and lower end surfaces of the laminate in the metal fixing ring by laser welding, and a fourth step of dividing the two-divided ring to expose the outer circumference of the cylindrical portion of the laminate and fixing it by laser welding. A method of manufacturing a cylindrical stator, which comprises the steps of.