JPS5834923B2 - Manufacturing method of core plate for transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a method for manufacturing a laminated core for a transformer, in which a grain-oriented silicon steel plate is cut into a trapezoidal shape to form a core plate.

The core of a large transformer is made of cut and laminated silicon steel plates.

In particular, each core plate is cut into a trapezoid shape so that the direction of magnetic flux at the joint between the leg core and the yoke is along the rolling direction of the steel plate, which has good magnetic properties.

This kind of iron core plate is made of a steel plate coil made by winding a band steel plate into a coil shape, and the steel plate pulled out from the coil material is sent to a press by a feed roller, and both ends are cut to a predetermined length as described above.
It is made by cutting it at a 5° angle.

Particularly in large transformers, a large amount of material is used to construct the core, and a large number of the above-mentioned coil materials are used to manufacture one transformer core.

In this case, the steel strip rolled through the rolling mill is a rectangular strip, and if the trapezoidal core plates are sequentially cut at an angle of <45° as described above, one end of the coil material will always have a 45° angle. This results in the production of half-cut materials that have been cut into pieces.

In the past, these half-finished materials were disposed of as scrap.

Particularly in large transformers, the iron core plates are also elongated, so the proportion of scrap materials in the total amount of materials used cannot be ignored, and this increases the number of coil materials used.

This is a factor that increases material costs.

Furthermore, in order to dispose of the above-mentioned scraps, it is natural that manual work is required to remove the scraps from the iron core plate production line, and during this time the production line has to be interrupted, so the operation is interrupted. The utilization rate will also decrease.

In addition, the need for manual labor is an obstacle to promoting automation of transformer core manufacturing.

For this purpose, a method has been proposed in which the terminal end of the coil material and the starting end of the next supplied coil material are welded together as shown in FIG. 1, so that the material can be fed into the press without producing scrap.

In the figure, numeral 1 is a coil material obtained by winding a band steel plate 1a into a coil shape.

The steel strip 1a is pulled out from the coil material 1. Double feed reroller 2
is fed into the swinging shear 3 of the press.

As is well known, the swinging shear 3 has an upper blade 3a and a lower blade 3b made of a steel plate 1.
tilted at 45° to a.

Moreover, it is configured to be reversed by 90 degrees for each press stroke.

When the tip of the steel strip 1a hits the stopper 4, the main feed roller 2 stops, the shear 3 operates, and the trapezoidal core plate 5 is cut.

At the same time, the stopper 4 retreats, and the iron core plate 5 is carried out and 5i
, 51I.

It is accumulated as shown in 5■.

Now, when the steel strip is drawn out from one coil material, the terminal end and the starting end drawn from the next supplied coil material are butt-welded as shown by the symbol W via the welding mechanism 6. Ru.

That is, the first coil material and the second coil material supplied later are welded and joined to form a continuous steel strip, and the iron core plate 5 is continuously cut without producing any half pieces.

A trapezoidal core plate with welds is shown as 5■.

When the present invention implements the manufacturing method as shown in FIG. 1, the first coil material and the second coil material to be supplied next can be bonded well, and the manufacturing method is advantageous for promoting automation. The purpose is to provide

The method of the present invention will be explained in detail below based on illustrated embodiments.

In FIG. 2, two sets of coil materials 11211 are accommodated and set in coil material cradles 7<b>1 and 7<b>2 which are independently moved by themselves with respect to the production line.

Each cradle 7I, 7I[ is equipped with a pinch roller 8 connected to a drive motor.

Reference numeral 9 denotes an automatic cutting and welding device installed in the conveyance path of the steel strip in front of the main feed roller 2, and its detailed structure is shown in the third section.
FIG. 4 will be described later.

First, in the above-described configuration, the starting end of the coil material 1 2 set in the cradle TI is sent out to the main feed roller 2 by the pinch roller 8 .

When the steel strip 1a reaches the main feed roller, the pinch roller 8
is free to drive, and the steel strip 1a is sent to the shear 3 of the press by the double feed reroller 2, and the trapezoidal core plates 5 are sequentially cut as described in FIG.

When all the coil material 11 of Credor 7I is pulled out.

The end of the strip steel plate 1a is immediately detected at the point where the steel plate presence/absence detector 10 is notified, and the drive motor 2a of the main feed roller 2 is activated.
is switched to low speed, and at the same time 11 of the odometers 11 and 12 provided on both sides of the cutting and welding device 9 are activated.
At the point where the steel strip 1a runs a preset distance and its terminal end is located at the end face alignment cutting mechanism 13, the double feed reroller 2
to stop.

Next, the empty cradle 7■ is moved backwards, and at the same time the second cradle 7■, which has been set in advance, is moved backwards from the other cradle 7■.
The steel strip 1a of the coil material 1 is pulled out via the pinch roller 8.

When the starting end of the steel plate of the coil material 1■ passes through the steel plate detector 10.

This time, the odometer 12 is activated, and when the starting end of the coil material 1■ reaches the position of the cutting mechanism 13 after traveling a preset distance, the drive of the pinch roller 8 of the cradle 7■ is stopped and the coil is free. Become.

Next, the terminal end of the first coil material 11 and the second coil material 1
The cutting and welding device 9 prepares the end face and cuts the starting end.The structure of the cutting and welding device 9 will now be described with reference to FIGS. 3 and 4.

In the figure, the cutting machine mechanism 13 has two lower blades 13a, 13a arranged along the conveyance direction of the steel strip 1a, and an upper blade 13C paired with each lower blade.

The upper blade 13C is rotated between a cutting position and a standby position indicated by a chain line, and at the cutting position performs a cutting operation by operating the tension cylinder 14.

Furthermore, clampers 15a and 15b are provided on both left and right sides of the lower blades 13a and 13b on the base of the device 9.

The clampers 15a and 15b clamp and clamp the steel strip 1a from above and below according to a command.
5a and 15b as a whole are each cylinder 16a.

It is configured to be operated to move left and right via the handle 16b.

The device 9 further includes a welding mechanism. The welding mechanism is a welding torch 17. A guide rod 20 movably guides the support body 19 of the pressure roller 181 in the width direction of the steel strip 1a. A motor 21 and a rotation screw 22, provided to drive the support 19 along the guide rod 20. and cylinder 2 from below.
It consists of a backing plate 24 that can be raised and lowered at 3.

The steps of automatic cutting and welding operations of the device 9 shown in FIGS. 3 and 4 are as shown in FIG. 5 a = d.

That is, as described above, the terminal end E of the first coil material II and the second
The starting end S of the coil material 1 is connected to the end face alignment cutting mechanism 1.
The optimum cutting distance (
10 to 20 mm) and the steel plates 1a are stopped at the stop position, the clampers 15a and 15b clamp each steel plate 1a at that position as shown in figure b, and the upper blade 13c prepares each end and cuts them at the same time.

Thereafter, the cylinder 16 in FIG. 4 remains clamped.
Both clampers 15a and 15b are attracted to each other by a and 16b.

As shown in Figure C, the ends E and S of both steel strips are butted against each other.

During this movement, the steel plate of the first coil material 11 is slightly returned from the main feeding roller side, and the steel plate of the second coil material 1 is pulled out.

Next, as shown in Figure d, the backing plate 24 is raised from below, and the welding torch 17 is lowered from above to perform welding W along the end faces of both steel plates.

For this welding, arc welding or plasma welding, for example, is used to prevent build-up of weld metal.

As described above, the terminal end of the first coil material 11 and the starting end of the second coil material 1■ have been continuously connected on the production line, and are fed into the press via the main feed roller 2 again to form a trapezoidal iron core plate. The judgment will be made.

Note that the welding mechanism, clamper, etc. in the device 9 are returned to their original standby positions.

Furthermore, all of the above series of operations are linked and controlled so that they are all performed automatically.

As described above, according to the method of the present invention, when the coil material is continuously supplied to the press and the core plates are cut in sequence, when all of the coil material is drawn out, the starting end of the second coil is After trimming and cutting the section and the terminal end of the first coil material, both end surfaces are brought together and welded together.

Therefore, all of the coil material can be effectively used as the iron core plate without producing waste scrap material, and the material saving effect is extremely large.

Moreover, in implementing the manufacturing method, it is easy to mechanize the continuous joining process between coil materials, and a manufacturing method can be provided that is effective in automating the manufacturing of transformer core plates.

[Brief explanation of the drawing]

Fig. 1 is a process outline diagram of the manufacturing method to which the present invention applies, Fig. 2 is a configuration diagram of an apparatus for carrying out the method of the present invention, and Figs. 3 and 4 are automatic cutting and welding in Fig. 2. A front view and a side view of the apparatus, and FIGS. 5a to 5d are operation process diagrams of the apparatus shown in FIGS. 3 and 4. Il, III: coil material, 1a: steel strip of coil material. 2: Main feed roller, 3 nibless shear, 5: Cut trapezoidal core plate, 7I, 7 [: Cradle of coil material, 8
: Vinci roller, 9: Cutting and welding device. 13: End face alignment cutting mechanism, 13a, 13b: Lower blade. 13c: upper blade, 15a, 15b: clamper 17: welding torch of welding mechanism, W: welding part, E: terminal end of coil material, S: starting end of coil material.

Claims (1)

[Claims] 1 A step of feeding the steel strip supplied from the steel strip coil material set in the cradle to the press via the main feed roller mechanism, cutting and forming a trapezoidal core plate of a predetermined size, and cutting the end of the steel strip of the coil material. The feed is stopped when the end portion is fed to a predetermined cutting position in an end face alignment cutting mechanism that has two pairs of blades arranged along the conveyance direction of the steel strip installed in the middle of the steel strip conveyance path. The process of clamping the steel strip at that position, detecting the starting end of the steel strip pulled out from the new coil material set in the primary cradle, and feeding the starting end to a predetermined cutting position in the end face alignment cutting mechanism. a step of stopping the feeding and clamping the steel strip at that position; a step of simultaneously cutting the terminal end of the preceding steel strip and the starting end of the following steel strip by aligning the end faces with an end face alignment cutting mechanism; Manufactured by a process of pulling and moving the clamped parts together while keeping both subsequent steel strips clamped to butt the cut end faces of the previous process, and a process of welding and joining both of the steel strips along the butted end faces. A method of manufacturing a transformer core plate characterized by: