JPS6254564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing method for forming a profiled material by cold extruding a long material from a forming roll using a hydraulic machine.

Conventionally, in order to form a round steel pipe (hereinafter referred to as a blank pipe) into a deformed pipe or square steel pipe (hereinafter referred to as a deformed pipe) using a forming roll in a cold state, a forming roll or a die (in combination with a core metal) is used. The main methods used have been to form irregular-shaped tubes while pulling the raw tube through a roller (sometimes the tube is moved through a roller) or to form a modified-shaped tube while moving the raw tube by driving a forming roll. However, in the former case, it is difficult to center the chuck used when pulling out the raw pipe, so the resulting irregularly shaped pipe often becomes twisted, requiring a straightening process. There are disadvantages such as loss of parts and lower processing rate. In the latter case, there are restrictions on the products that can be manufactured, such as the difficulty of molding thick walls or special shapes, and there are also disadvantages such as requiring a large amount of capital for equipment.

An alternative to both methods is to use a hydraulic machine to push the raw pipe into forming rolls and extrude it into a deformed pipe, but when using very long raw pipes, a hydraulic machine with a large hydraulic cylinder stroke is required. The disadvantage is that the equipment cost is very high.

The present invention has been made to eliminate the above-mentioned drawbacks, and uses a hydraulic machine with a relatively small stroke of a hydraulic cylinder to easily form a irregularly shaped pipe from a long blank pipe, thereby reducing equipment costs. In addition, it is an object of the present invention to provide an extrusion molding method that can reduce the cost of irregularly shaped pipes.

An embodiment of the extrusion molding method according to the present invention will be described below based on the drawings. In Figures 1 to 3, 1 is an extrusion molding machine, 2 is a hydraulic cylinder installed in a hydraulic machine (the main body of the hydraulic machine is omitted in the figure), and 3 is a predetermined cylinder located near the center of the extrusion machine 1. A plurality of rectangular plate-shaped holding frames are installed on the base 4 at intervals, one on the hydraulic cylinder 2 side is slidably attached to the base 4, and the others are fixed to the base 4. Further, each holding frame 3 has a rectangular holding portion 5 bored near the center of its surface;
An opening 6 that communicates with the holding portion 5 and is formed on the side surface.
and a holding roller 7 provided near the center of each side of the holding part 5 without an opening 6 on the surface on the hydraulic cylinder 2 side, and fixed to the base 4 behind the holding frame 3 on the hydraulic cylinder 2 side. a supporting plate 8,
Through-holes 11 are bored at the four corners into which four guide rods 10 are inserted, which are installed between the molding stand 9 fixed to the base 4 at the front of the extrusion molding machine 1.

Reference numeral 12 is connected to the tip of the hydraulic cylinder 2 through which a bearing 13 provided on the support plate 8 is inserted, via a base plate 14 through which the guide rod 10 is inserted, and a holding roller is connected to the holding portion 5 of the holding frame 3. The boom is slidably held via the boom 7 and slides back and forth following the reciprocating motion of the hydraulic cylinder 2. Sho boom 1
2, locks the operation port 15 of the raw pipe P which is bored in the side wall facing the opening 6 of the holding frame 3, and the rear end of the raw pipe P provided near the center of the interior and at the outlet. Pressing air cylinder 17 and rectangular plate-shaped locking plate 18
A locking device 16 consisting of a locking device 16, and a locking plate 18 that is vertically raised by operating an air cylinder 17 of the locking device 16 are fixed to the inner wall so that they can be held fixed even under extrusion pressure. A blocking plate 19 in the shape of a rectangular frame, and a centering stand 21 provided so that when the raw tube P is loaded, the axis of the raw tube P matches the forming center of the forming roll 20 attached to the forming stand 9.
It is equipped with

22 is a centering frame device provided for the same purpose as the centering frame 21 inside the boom 12;
is supported by the air cylinder 24, and the raw pipe P
The centering pedestal 23 is designed to fall sideways when the boom 12 moves forward to push the material into the forming roll 20. 25 is a straightening machine, 26 is a raw pipe yard used when loading the raw pipe P into the boom 12, 2
Reference numeral 7 denotes a pull-back device that slides the holding frame 3 that has been slid forward on the substrate 14 backward to return it to its original position.

Next, the procedure for forming a deformed tube by pushing the raw tube P into the forming rolls 20 will be described below with reference to FIG. 4. First, in the first step, both air cylinders 17 are operated in advance to place both locking plates 18 in a horizontal state, and the raw pipe P to be molded is
After placing it on the raw tube yard 26, the centering stand 21
Then, the raw pipe P is loaded into the boom 12 so as to be placed on the centering frame device 22, and further adjusted so that the tip of the raw pipe P is at the reference position a. (Figure 4).

Next, in the second step, the hydraulic machine is moved to press the base plate 14 of the boom 12 with the hydraulic cylinder 2, and the raw pipe P, which moves forward with the boom 12, is pushed into the forming rolls 20 and formed sequentially from the tip. When the holding frame ₃₁ moves together with the substrate 14 and comes into contact with the fixed holding frame ₃₂ , the hydraulic machine is stopped and the first press molding operation is completed (FIG. 4). Subsequently, in the third step, the hydraulic machine is moved in reverse to move the boom 12 back together with the cylinder 2,
Locking device 1 in which the rear end of the raw pipe P is inside the boom 12
When the locking plate 18 of 6 reaches a position that is clear from the movable distance, the reverse movement is stopped and the air cylinder 1
7 to vertically raise the locking plate 18 and bring it into contact with the blocking plate 19 (FIG. 4).

Furthermore, in the fourth step, similar to the second step, the hydraulic machine is moved to move the hydraulic cylinder 2 to the boom 1.
The locking plate 1 of the locking device 16 is pressed against the base plate 14 of the locking device 16.
The raw pipe P is successively pushed into the forming rolls 20 through the rollers 8 to be sequentially formed. As in the case of the second step, when the holding frame ₃₁ approaches the holding frame ₃₂ , the hydraulic machine is stopped and the second push-forming operation is completed (the fourth
figure).

In the fifth step, similarly to the third step, the hydraulic machine is moved in reverse to move the boom 12 backward, and the raw pipe P
When the rear end of the locking plate 18 of the locking device 16 at the exit of the boom 12 reaches a position where it can move, the reverse movement is stopped, and the air cylinder 17 of the locking device 16 is operated to close the locking plate. 18 is made to stand vertically and abut against the blocking plate 19 (FIG. 4).

In the sixth step, similarly to the fourth step, the hydraulic machine is operated, and the raw pipe P is further pushed into the forming rolls 20 via the locking plate 18 of the locking device 16 at the outlet, and is sequentially formed. Holding frame 3 ₁ is holding frame 3 ₂
When it approaches, the hydraulic machine is stopped and the indentation process is completed.

In this case, a locking device 1 is installed between the raw pipe P and the hydraulic cylinder 2 at two locations: near the center of the interior and at the outlet.
The boom 12 equipped with a boom 12 is interposed, first through the base plate 14, then through the locking plate 18 inside the boom 12, and finally through the locking plate 18 at the exit of the boom 12.
Since extrusion molding is performed by pressing the rear end, even if the stroke of the hydraulic cylinder 2 of the hydraulic machine is short, the long blank pipe P can be easily molded into a deformed pipe.

In the embodiment described above, two locking devices for the boom 12 are provided near the center of the interior and at the exit, but one or three or more locking devices may be provided at appropriate intervals as required. Also, in the 6th step (Fig. 4), the raw pipe P
Although the rear end is shown to be left movable, the base pipe can be removed by moving the reference position a close to the forming stand 9, or by interposing a pressing jig at the tip of the exit locking device 16. It is possible to mold almost the rear end of P. Furthermore, although the locking device 16 is composed of an air cylinder 17 and a locking plate 18, it is not necessary to use any other device as long as it can stand vertically if necessary and is strong enough to withstand the pressing force during molding. The present invention is not limited to this configuration and structure.

The present invention involves locking the rear end of the material at an appropriate position between a hydraulic cylinder and the material when cold extruding a long material from a forming roll using a hydraulic machine to form a deformed material. Since the extrusion molding method is characterized by interposing a device that is movable with the material, the following effects are achieved.

(1) A hydraulic machine equipped with a short-stroke hydraulic cylinder can form irregularly shaped materials from long blank pipes, reducing equipment costs and contributing to increased corporate profits.

(2) It is possible to reduce equipment costs, lower indirect costs, and reduce loss of materials, so it is possible to reduce the cost of irregularly shaped pipes.

[Brief explanation of the drawing]

Figures 1 to 3 show the main parts of the extrusion molding machine used in the present invention, with Figure 1 being a plan view, Figure 2 being a side view, Figure 3 being an enlarged sectional view taken along line A-A, and Figure 4 being an enlarged sectional view. 1 is a schematic diagram of an extrusion molding machine for explaining the extrusion molding method according to the present invention. 2...Hydraulic cylinder, 12...Boom, 16
... Locking device, 20 ... Forming roll.

Claims (1)

[Claims] 1. When cold extruding a long material from a forming roll with a hydraulic machine to form a deformed material, the rear end of the material is locked at an appropriate position between the hydraulic cylinder and the material. 1. An extrusion molding method characterized in that the extrusion molding process is carried out by interposing a device that can be moved together with the extrusion molding process.