JPH0655336B2 - Joining method of positioning guide box for fixed electromagnet used in electromagnetic contactor and substrate - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method for joining a positioning guide box for a fixed electromagnet used in an electromagnetic contactor and a substrate.

[Prior art and its problems]

The robustness and dimensional accuracy of the joint between the positioning guide box of the fixed electromagnet used in the electromagnetic contactor and the substrate affect the function of the electromagnetic contactor. The joint part is constantly and frequently applied with an impact when the electromagnet is opened and closed. When such an impact is frequently received, the joint portion is easily damaged such as damage or loosening due to the impact, and fatigue damage due to repeated stress. Therefore, in joining the guide box and the substrate, it is necessary to have an average joining strength that is strong overall and has no local weak points. Conventionally, as a method of joining the metal plates, (1) a method of joining the metal plates by welding, (2) a through hole is provided between the metal plates, a method of joining the through holes by inserting a rivet and caulking, (3) A screw hole is formed in one metal plate, a through hole is provided in the other metal plate, the screw hole and the through hole are overlapped, and the screw is inserted,
There is a method of joining by screwing. However, in the method of joining by welding described in (1) above, distortion occurs in both metal plates due to welding heat, and dimensional accuracy cannot be obtained. Further, in the method of (2) in which the rivet is inserted and crimped and joined, not only a large pressing force is required to crush the stud at the time of crimping, but also the process and the number of parts for piercing the stud are increased because the stud is required. . Further, in the case of a thin plate, the metal plate is distorted by the pressure applied during crimping. Furthermore, in the method of joining by tightening the screw in (3), it is necessary to process female metal on one metal plate, which requires a long processing time.In addition, a screwing process is required to connect the metal plates with countersunk screws. However, there has been a big problem in improving work efficiency such as a step of applying an adhesive having a spring washer inserted therein in order to prevent loosening of the countersunk screw. In general, when fixing two or more metal plates using flat head screws or flat tacks, make sure that the flat plate does not project to the outer surface of the metal plate that is the member on the side where the flat head screws or flat tacks are inserted. The dish is being picked up. When performing this dish removal, the processed product is placed on the die, the punch is used to punch a mounting hole at a predetermined position of the member, and then the periphery of the mounting hole is formed by the drilling work of the drill of the drilling machine. Was there. However, according to this method, when the dish is removed, there is a time loss in transporting the members between the steps because the punching step by the press and the dish removing step by the drilling machine are different from each other. Along with the issues, it is a major issue in improving work efficiency.

[Object of the Invention]

Therefore, an object of the present invention is to have a durability even when it is used at a joint portion between a substrate and a positioning guide box of a fixed electromagnet used in an electromagnetic contactor, which is frequently subjected to impacts, and is pressed in all steps. It is intended to provide a joining method only by using.

[Constitution of the invention]

The structure of the invention taken to achieve the above object is as follows. That is, the present invention includes (a) a guide box for positioning a fixed electromagnet made of metal, in which an escape groove is formed in the inner periphery when the mounting hole is punched by a press, and the inner peripheral edge portion on the surface side of the mounting hole is formed by a press. A step of removing the surplus generated by the bulging deformation into the relief groove while performing a smoothing operation with a press, (b) an appropriate number of cuts are formed substantially evenly on the tip by burring processing with a press on a metal substrate. And a step of forming a cylindrical insert having a height substantially the same as the plate thickness of the guide box, (c) removing the insert formed on the substrate into a mounting hole formed on the fixed electromagnet positioning guide box. After inserting from the side opposite to the part, pressing and expanding the insert body so that it does not come out of the flattening part by pressing, joining method of the guide box for positioning the fixed electromagnet used in the electromagnetic contactor and the board To It is intended to stabilize the accuracy of parts, reliability of caulking strength, and shortening of processing time. For example, since the positioning guide box itself supports the fixed iron core, it is made of a relatively thick steel plate or the like so as to have a certain strength. Since the substrate also supports the electromagnetic contactor as a whole, a steel plate or the like which is thicker than the positioning guide box is used. The present invention provides a joining method in which a metal plate such as such a relatively thick steel plate has durability against impact and can be processed only by pressing. The punch for forming the mounting hole having an arbitrary number of escape grooves on the inner periphery by punching with a press and the punch for flattening can be formed by the same punch in a single pressing step, or separately. It can also be formed in two batches with a punch.

【Example】

The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 is a plan view of a guide box for positioning a fixed electromagnet used in an electromagnetic contactor, and FIG. 2 is a sectional view taken along the line I-I of FIG. In the figure, reference numeral 1 is a guide box for positioning a fixed electromagnet, which is a plate member to be attached in this case. The guide box 1 uses a metal plate such as a steel plate, and has mounting holes 2 provided at four positions by punching with a press. The mounting holes 2 are provided with four escape grooves 3 radially. The relief groove 3 prevents the outer surface of the guide box 1 from rising as a relief of a surplus portion of a portion that is bulged and deformed by pressing when one inner edge portion of the mounting hole 2 provided in the steel plate is removed by pressing. , To ensure the accuracy of parts. Then, a smoothing portion 20 is formed on the inner edge portion of the front surface side of the mounting hole 2 by pressing. FIG. 3 is a plan view of the substrate joined to the guide box, and FIG. 4 is a sectional view taken along the line II-II of FIG. A metal plate such as a steel plate is used for the substrate 4 which is a mounting plate material, and a thickness t2 substantially equal to the plate thickness t1 of the substrate 4 is obtained by burring.
Cylindrical inserts 5 having a number of are provided in a number corresponding to the mounting holes 2 of the guide box 1, and the insert 5 has four cuts 6 at the tip thereof. The cut 6 is formed so that the insert 5 can be easily expanded by the movable mold 7 of the press when the insert 5 provided on the substrate 4 is expanded by pressing, and the outer peripheral surface 9 of the insert 5 is guided by the guide. Inner surface 8 of the flat part 20 of the box 1
It is designed to ensure close contact with. The height of the insert body 5 is formed to be substantially the same as the thickness t3 of the guide box 1. The number of the cuts 6 can be arbitrarily selected according to the shape of the joint portion, and the arrangement thereof is also arbitrary, but an arrangement in which the circumference is evenly divided is preferable because the caulking strength is averaged. FIG. 5 is a cross-sectional view in which the insert body provided on the board is fitted into a mounting hole provided on the guide box, and FIG. 6 shows a state in which the insert body is pressed and expanded to join the board and the guide box. FIG. As shown in FIG. 5, the insert body 5 provided on the substrate 4 is fitted into the mounting hole 2 provided in the guide box 1, and from this state, the flatness angle θ of the flattening portion 20 of the guide box 1 attached to the press is set.
The movable mold 7 having the cone shape θ2 equal to 1 moves in the Y direction,
The insert 5 provided on the substrate 4 is spread out, and the outer peripheral surface 9 of the insert 5 is brought into close contact with the flattening surface 8 of the flattening hole 2 provided on the guide box 1 to complete the joining of the substrate 4 and the guide box 1. . It should be noted that the tip of the insert body 5 is the outer surface 1a of the joint portion of the guide box 1.
The dimensions are adjusted or pressed so that they do not protrude.

【The invention's effect】

The present invention has the following effects. (1) (a) a step of providing a mounting hole, (b) a step of forming an insert body, (c) a step of inserting the insert body from the side opposite to the flat portion of the mounting hole and then pressing and expanding the insert body, In the three steps, the positioning guide box of the fixed electromagnet used for the electromagnetic contactor and the substrate can be joined. Therefore, there is no need for a step of aligning the through holes and inserting the tack, a step of engraving a screw on one of the through holes, and further aligning the through holes and inserting and screwing the screws. (2) Since all the steps can be performed only by pressing, the joining work time can be shortened, the work can be easily automated, and the joining efficiency can be improved. (3) A guide box for positioning a fixed electromagnet made of metal is formed by aligning radial relief grooves on the inner circumference when punching out the mounting hole with a press, and further the inner edge of the surface side of the mounting hole is removed with a press. Therefore, the surplus portion of the portion which is bulged and deformed by the press does not bulge into the escape groove and rise upward, so that dish removal can be performed neatly. (4) By burring by pressing, a suitable number of cuts are formed substantially evenly at the tip and a cylindrical insert having a height approximately the same as the plate thickness of the guide box is formed, and the insert is fixed as described above. After inserting it into the mounting hole formed in the guide box for positioning the electromagnet from the side opposite to the flattening portion, the insert is pressed and expanded so as not to come out of the flattening portion by a press. Therefore, the insert does not interfere with the mounting of the parts. Also, due to the break, the insert can be easily spread by the movable mold of the press, and the outer peripheral surface of the insert surely comes into close contact with the inner surface of the flat part of the guide box, so that part accuracy can be ensured, and the break Since they are arranged and formed substantially evenly, the crimping strength is averaged.

[Brief description of drawings]

1 is a plan view of a guide box for positioning a fixed electromagnet used in an electromagnetic contactor, FIG. 2 is a cross-sectional view taken along the line I-I of FIG. 1, and FIG. 3 is a plan view of a substrate joined to the guide box. Fig. 4, Fig. 4 is a cross-sectional view taken along the line II-II in Fig. 3, Fig. 5 is a cross-sectional view in which the insert body provided in the board is fitted into the mounting hole provided in the guide box, and Fig. 6 is the insert. It is sectional drawing which shows the state which pressed the body and joined the board | substrate and the guide box. 1: Guide box (attached plate material) 2: Mounting hole 20: Flat part 3: Escape groove 4: Board (mounting plate material) 5: Insert body 6: Cut

Claims (1)

[Claims] (A) A guide box for positioning a fixed electromagnet made of metal is formed by aligning an escape groove with an inner periphery when a mounting hole is punched by a press, and further, at a surface side inner edge portion of the mounting hole,
A step of removing the surplus due to the bulging deformation caused by the press into the relief groove while performing the smoothing by the press, (b) Arranging an appropriate number of cuts at the tip substantially evenly on the metal substrate by the burring process by the press Forming a cylindrical insert having the same height as the plate thickness of the guide box, (c) inserting the insert formed on the substrate into a mounting hole formed in the fixed electromagnet positioning guide box. A guide box for positioning a fixed electromagnet used in an electromagnetic contactor, which comprises a step of pressing and expanding the insert body so that it does not come out of the scraper after inserting it from the side opposite to the catching portion. Bonding method with substrate.