JPH0471785A - Method for joining hoops - Google Patents

Abstract

PURPOSE:To smooth an operation in the following stage by suitably cutting the last part of a 1st hoop and the foremost part of a 2nd hoop and making resistance welding of a lapped part. CONSTITUTION:The back of the 1st hoop and the front of the 2nd hoop are cut by a punch at one stage respectively at parts 14a, 14b. In this case, pilot holes 13a-d are used for reference to avoid confusion of periodicity of the pattern of the hoop. Then, the lapping parts 16a, 16b are lapped, welding with pressure is performed by a resistance welding machine, the lapped part 16a, 16b is squeezed and substantially equalized in thickness to the unlapped part. In this way, the thickness of the joined part is nearly equal to that of the hoop and can be supplied smoothly to a press apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for connecting hoops wound on a reel. [Prior art] Conventionally, hoops wound on a reel are connected by the following methods.

■ Use eyelets.

■ Use a stapler.

■ Spot welding.

■ TiG welding.

■ Connection using splice fittings.

In methods (1) and (2) described above, the rear end of the first hoop and the front end of the second hoop are overlapped and fastened together using eyelets or staples, but the thickness of the connecting part is twice that of the other parts.

In method (2), the rear end of the first hoop and the front end of the second hoop are overlapped and spot welded, so the thickness of the connected part is about twice that of the other parts.

In method 2, the rear end of the first hoop and the front end of the second hoop are overlapped, and an arc is generated between the non-consumable tungsten electrode and the overlapped part of the hoop in an inert gas (argon gas) atmosphere. Then, a welding rod is inserted into the arc to fusion weld the overlapping parts. As a result, a wider area than the overlapping portions of the hoops is heated, which may damage the mold and the like around the connection points of the hoops. Also, the thickness of the welded portion is approximately twice that of the rest of the hoop.

In method (2), the rearmost portion of the first hoop and the foremost portion of the second hoop are connected by splice fittings. This method is more time consuming and expensive than spot welding because it requires special splice fittings for each hoop pattern.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional techniques, except for methods using splice fittings, the thickness of the connection portion is twice as thick as that of the non-overlapping portion of the hoop. It is difficult for the hoop to enter between the narrow guides. In addition, the thickness of the connected hoop becomes uneven from the normal part to the connected part, so when plating is applied, there is a problem that the thickness of the plating is not constant before and after the overlapping part. .

Furthermore, when using the TiG welding method, since the heating range is wide, there is a risk that the influence of heat will reach beyond the overlapped portion and damage the mold etc. around the hoop connection point.

In addition, when connecting using splice metal fittings, the processing cost is high because the splice metal fittings have a complicated shape, and it is necessary to prepare special splice metal fittings for each hoop pattern. The number of types of inventory will also increase. Therefore, there are problems in that the material cost is higher than in other methods, and the work time is increased because splice fittings of complicated shapes must be attached to each hoop.

The present invention solves this type of problem, since the thickness of the connected points is no different from other unconnected points, and therefore the hoop can be fed smoothly to the press equipment without any hindrances. The purpose of the present invention is to provide a method for connecting hoops that is easy to perform and inexpensive.

[Means for Solving the Problems &] In order to solve the above problems, the present invention includes: a first step of overlapping the rearmost part of the first hoop and the frontmost part of the second hoop; a second step of press-welding the molded portion with arranged electrodes; and a third step of resistance welding the first hoop and the second hoop.
It is characterized by the following steps:

[Function] In the hoop connecting method according to the present invention, the first
Cut the rear end of the first hoop and the front end of the second hoop to be connected to it, overlap them to meet the required strength, and press the overlapping part with electrodes of a resistance welder placed opposite each other. do.

When the overlapping portions of the hoops arranged in this manner are resistance welded, the overlapping portions of the hoops are crushed, and the thickness thereof can be made the same as that of other portions of the hoop.

[Embodiments] The hoop connecting method according to the present invention will be described in detail below with reference to the accompanying drawings, using preferred embodiments in relation to the apparatus for carrying out the method.

In FIGS. 1 and 2, reference numeral 10 designates the first hoop. The rear part of the first hoop 10 and the front part of the second hoop 12 wound on a reel (not shown) are cut in one step using a punch at cutting surfaces 14a and 14b, respectively. The cut surfaces 14a, 14b are such that the periodicity of the hoop pattern is not disturbed when the first and second hoops 10.12 are overlapped with reference to the pilot holes 13a, 13b, 13c, and 13d provided in advance. The position is set as follows.

Therefore, the overlapping parts 16a and 16b are overlapped, and the electrode 18a of a well-balanced resistance welding machine is connected to a power source (not shown).
, 18b sandwich the shaped portions 16a and 16b and apply pressure and electricity. As a result, the overlapping portions 16a, 16b of said hoop 10.12 are crushed by the electrodes and have substantially the same thickness as the other non-overlapping portions.

According to experiments, the example shown below was suitable. In other words, the hoop 10.12 is made of brass and its width is 7.
mm, the thickness is 0.5 mm, and the overlap is 2 mm.

The opposing electrodes 18a, 18'b are pressed against the overlapping portions 16a, 16b with a weight of 150 kg, and the weight is 9.5 kA.
is energized for only 9 cycles. Under the above conditions, the above projection distance was 0.6 mm. It was confirmed that there was no effect of heat on the resin mold around the weld area.

[Effects of the Invention] As described above, in the method for connecting hoops according to the present invention, the thickness of the connecting portion becomes almost the same as the thickness of the hoop, and the hoop can be smoothly supplied to the press device. Furthermore, the thickness of the plating does not become non-uniform in the vicinity of the connection points, and since the heating range is limited to the overlapping areas, there is no risk of damage to the surrounding covering material due to heat. Furthermore, since the hoops are connected by welding, it is inexpensive and the work is simple, so the working time is short.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a hoop connecting portion, and FIG. 2 is a partial vertical sectional view showing the relationship between the electrode of a resistance welding machine and the overlapping portion of the hoop when carrying out the hoop connecting method according to the present invention. . 10... First hoop 12... Second hoop 14a, 14b... Cut surfaces 16, a, 16b... Overlapping portions 18a, 18b... Electrode

Claims (1)

[Claims] (1) a first step of overlapping the rearmost part of the first hoop and the frontmost part of the second hoop; a second step of press-welding the overlapping part with opposingly arranged electrodes of a welding machine; The third step is to resistance weld the hoop and the second hoop.
A method for connecting hoops, comprising the steps of: and.