JP2691689B2 - Manufacturing method of welding transformer for resistance welding - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a welding transformer in a resistance welding machine. [0002] Conventionally, the manufacturing process of this type of welding transformer is
One of the well known methods is to manufacture a primary wire wheel, a secondary wire wheel, a combination of a primary wire wheel and a secondary wire wheel, and a method in which only the wire wheel block is coated with an insulating resin. However, in this method, there are places where resin has not entered,
I can't expect complete insulation, so as another method,
Attach the assembled wire block to the mold, vacuum impregnate the insulating resin in the vacuum pot, heat-cure it, and release it. Then, iron core, clamp plate, etc. for the wire block. Then, the transformer was completed by assembling it with the fastening members. [0003] The above-mentioned method of using the molding die of the prior art requires an expensive die, and the number of transformers produced depends on the quantity of the die. . Further, the number of steps for attaching and detaching the wire ring block to and from the molding die has been difficult. Therefore, an object of the present invention is to manufacture a molded transformer without using a die for molding a wire ring. In order to achieve the above-mentioned object, a method for manufacturing a welding transformer for resistance welding according to the present invention, which is proposed, includes a welding transformer wire as shown in FIG. Rather than the method of molding only the ring with the resin for insulation, the upper lid 1 for molding, the bottom plate 2 for molding, and the bottom lid 3 for molding are mounted in a state where the welding transformer is assembled, and then integral molding is performed. [0006] Therefore, the expensive wire ring molding die in the prior art becomes unnecessary, and instead, a molding top cover 1, a molding bottom plate 2 and a mold having a wide injection port necessary for injecting the molding resin are provided. The bottom cover 3 and the transformer main bodies 7 to 10 and bolts for fastening them together. According to the present invention having the above-mentioned structure, the transformer is integrally formed without using the wire ring mold.
In the method of manufacturing a welding transformer for resistance welding, which is characterized by resin molding, it does not have a complicated structure like the conventional die for molding a wire ring, and in addition, high precision is required. Nonetheless, there is no big problem that the mold is inevitably expensive. [0008] Therefore, such an expensive mold is not necessary, and naturally, it is not necessary to attach and detach the mold in the state where the primary wheel and the secondary wire are assembled in a wheel block state. The mold top cover 1, the mold bottom plate 2 and the mold bottom cover 3 according to the present invention have a simple shape and have a simple structure as compared with the prior art mold for a wire ring, and thus can be easily processed.
Naturally, it can be supplied at low cost, and at the same time, it can be easily attached and detached due to the simple structure, and the work man-hours are greatly reduced. Moreover, since the prior art molds are expensive, the quantity that can be prepared is limited, and therefore, the current situation is that the number of transformers produced depends on the quantity of the molds. However, since the welding transformer manufacturing apparatus according to the present invention is inexpensive, it is possible to prepare a relatively large amount,
The outstanding effect is expected to be released from the important problem that the production quantity is influenced by the mold. EXAMPLE A method for manufacturing a welding transformer for resistance welding according to the present invention will be described below with reference to FIG. FIG.
FIG. 4 is a detailed cross-sectional view showing the configuration of a manufacturing apparatus for a resistance-welding welding transformer, which is an embodiment of the present invention and in which the transformer is integrally insulation-molded. There is a molding top cover 1 for molding a welding transformer, and there are a molding bottom plate 2 and a molding bottom cover 3 below the transformer and on the side of the secondary output terminal 6. 4 is a primary wire and a secondary wire, 5 is a lead for primary input,
7 is an iron core, 8 is an upper transformer clamping plate, 9 is a lower transformer clamping plate,
10 is a transformer case. Further, 11 is a resin for molding a transformer, and generally an epoxy resin is used. When the welding transformer is assembled up to the state where the upper cover (not shown) is not attached, reference numerals 1 to 1 in FIG.
Fasten the metal mold for item 3 with bolts. Of course, it is needless to say that a sealing material is filled between the upper clamping plate (8, 9) and the transformer case 10 and the mold fittings at a required position, if necessary. In this state, it is put in a vacuum pot, and a necessary amount is filled while vacuum-impregnating the insulating molding member through the opening of the upper molding lid. After that, the transformer taken out from the vacuum pot is set in a heating furnace and cured by heating. After heating at a constant temperature for a certain period of time, the insulating resin of the transformer taken out from the heating furnace is hardened, and the mold top cover 1, the mold bottom plate 2, and the mold bottom cover 3 are formed.
Remove. In order to facilitate this removal, it may be necessary to apply a release agent to the inner surfaces of the mold fittings (1 to 3) in advance before molding. After that, the transformer, which has reached room temperature, is sent to the final process, where necessary parts are assembled and completed. As is apparent from the above description of the structure and the manufacturing method, the present invention requires the vacuum of the coil, which is always necessary when manufacturing the resin mold type transformer by the conventional technique. Since the impregnation mold is unnecessary and it is difficult to prepare a large amount of it because it is expensive, there has been a problem that the number of transformers produced greatly depends on the number of molds. Therefore, the present invention has the outstanding effect of relieving this problem. Further, as can be judged from FIG. 1,
The molding top cover 1, the molding bottom plate 2, and the molding bottom cover 3 each have a simple shape and can be easily manufactured, and high-precision products can be easily manufactured. Much cheaper in comparison. Therefore,
It is also possible to prepare a large number of these mold fittings (1 to 3), and it becomes possible to deal with a temporary large-scale order. Further, because of the complicated structure, the attachment / detachment of the wire ring block to / from the molding die requires skill and requires a considerable number of man-hours. As a matter of course, it goes without saying that these man-hours are shortened because the molds do not need to be attached and detached. As described above, in addition to the double and triple effects, the integrally molded type makes it possible to overlook the outstanding effect of being stronger than the conventional product against a large shock from the outside of the transformer. I can't go. [0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an apparatus for manufacturing a welding transformer for resistance welding, which is characterized in that a transformer according to the present invention is integrally molded with a resin. [Explanation of reference symbols] 1 mold top lid 1-3 mold fitting 2 mold bottom plate 3 mold bottom lid 4 primary wire ring and secondary wire ring 5 primary wire ring lead-out lead 6 secondary output terminal 7 iron core 8 upper transformer Transformer clamp plate 9 Lower transformer clamp plate 10 Transformer case 11 Mold resin

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) Bibliographic references Sho 56-149428 (JP, U)                 51-75947 (JP, U)                 Actual Development Sho 61-81122 (JP, U)

Claims (1)

(57) [Claims] Use of a wire ring molding die for a welding transformer having a primary input terminal arranged above (top) and a secondary output terminal arranged below (ground). Without the transformer and mold resin
Mold top lid (1) with inlet and mold bottom
Plate (2), bottom lid (3) for molding, and bolts for these
A method of manufacturing a welding transformer for resistance welding, which comprises molding with a resin in a state of being fastened by a type .