JPH08155556A - Continuous forming method for twisted bar and twisting feed device - Google Patents

Abstract

PURPOSE: To facilitate continuous forming even in a cold state, capable of easily forming the bar stock of non-circular cross section such as a short polygonal bar into a twisted bar, while hard to continuously twist/feed out a long bar for clamping a twisted part and feeding out while twisting. CONSTITUTION: A section of bar stock is limited to a polygon internally in contact with a circle. As the polygonal bar is twisted and these edges are approximately come on the circumference of circle, the bar stock is treated as round bar and clamped by a holding caterpillar 8 for round bar feeding. The holding caterpillar 8 is rotated around the clamped bar stock while driving in the feed out direction, a long bar stock is continuously twisted and fed out. A central drive wheel 17 (chain wheel) is loosely fitted on a rotating shaft and synchronously drives both caterpillars. A chain wheel 13 rotates the holding caterpillar 8 through a rotating machine frame 10a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously forming a twist rod and a twist feed device therefor.

[0002]

2. Description of the Related Art A twist bar is a bar rod or other bar having a non-circular cross section that is twisted, and is designed for the purpose of improving the design effect of the appearance and the effect of fixing the reinforcing bar to concrete. In order to make a twisted rod, a primitive method of heating and softening a rod cut into a length suitable for the purpose of use and twisting the rod is used.
There is an invention of Japanese Patent No. 281023. According to the method of the present invention, a linear rod to be twisted is pushed into a guide hole having the same shape, and the guide is rotated.

[0003]

The invention disclosed in the above publication requires heating equipment and an oxidation prevention equipment or an oxide film removal equipment because the rod to be twisted must be heated.
Further, when it is tested, it is difficult to use a short twisted lead (pitch), and even a long twisted lead has a drawback that it tends to be uneven and irregular. It seems that it is unreasonable to push the bar material, which has been heated up to around 1000 ° C. and softened, between the pushing roller and the guide hole and push it into the untwisted guide hole to pass it. The present inventor should be able to perform accurate twist forming by cold working without using heating equipment, and to continuously take in while twisting the bar material, rather than pushing the bar material into the guide hole. I got the idea, and realized this.

[0004]

According to the continuous forming method of a twisted rod of the present invention, a long rod having a polygonal cross section inscribed in a circle is passed through a fixed die hole having substantially the same cross section to obtain a diameter close to the diameter of the circle. By holding the bar rod that can hold the round bar, while gripping the bar that came out of the die and taking it, by rotating the track around the bar, a straight bar material is inserted between the die and the track. The feature is that it is sent out as a twisted rod.

The rod material gathers together the peripheral surfaces of a plurality of forming rollers to form a material passage having the same shape as the cross section of the target twisted rod, and a feed roller capable of holding a straight rod of the above cross section, If a long metal round bar is pulled out from the above passage and made into a required cross section, it is possible to perform integrated production from the round bar material by cold working.

The torsion feed device of the present invention is provided with a rotary machine frame having a hollow rotary shaft which serves as an entrance path and an exit path for a rod to be twisted in the front and rear parts, and is mounted in the machine frame, and the entrance A pair of caterpillars that feed the rod between the passage and the exit passage, and a center drive that is loosely fitted to the outer circumference of the hollow rotating shaft and is driven by an external force to synchronously drive the pair of caterpillars through their respective transmission mechanisms. A wheel and a machine frame drive mechanism for rotating the machine frame by driving the hollow rotary shaft are provided, and each tread surface of the caterpillar is a concave surface capable of holding a round bar having a cross-sectional size close to the circumscribed circle of the bar to be twisted. It is characterized by being.

[0007]

In order to continuously form a long rod into a twisted rod, a method of rotating the guide hole while inserting the rod into the guide hole as in the above-mentioned published invention, and a means for holding the rod member A method is conceivable in which the holding means is rotated while being taken up by. This invention takes the latter method. As the clamping means, it is a production line of electric wires and hoses coated with rubber,
I thought about a new way to use the sandwiched caterpillar that pulls the product surface without damaging it.

Generally, a caterpillar has many shoes (steps).
The treads have the same shape, and are grooved according to the wire or bar that is clamped and drawn. However, according to the concept of the present invention, if a twist is applied while the bar is being taken, each tread of the caterpillar must be twisted one after another and the incoming bar must be added. It is not possible to reliably hold the treads of the same groove, and it is very difficult to change the shape of the grooves of each tread to accommodate twisting.

The use of the caterpillar, which was considered to be the most suitable means for applying a twist while pulling the bar, also caused a difficulty in the tread that could hold the twisted bar. The idea of overcoming this is to limit the material of the twisted bar to one having a polygonal cross section inscribed in a circle, and to consider and handle both the material and the twisted bar as a round bar having the above-mentioned cross section. A nipping caterpillar intended for a round bar is well known, and each tread surface thereof is generally an obtuse V-shaped groove as a concave groove capable of coping with dimensional changes of the round bar. Clamping Since each corner of the twisted bar that comes into the caterpillar is located on the circumference of the circumscribed circle, the circumscribed circle is clamped on one of the tracks of the track that holds the round bar that is the peripheral surface. It will be. Since the holding part of the caterpillar is long, it can be securely held in several places.

In the industrial continuous production of twisted rods, the raw material is drawn from the round rod coil. As a method of cold-working a round bar material into the required cross-section, we also proposed that the material be passed through a material passage made of multiple forming rollers and pulled out by a feed roller. As for the torsion feed device which is indispensable for the method of the present invention, a conventional pinching caterpillar is mounted in the rotary machine frame,
Since the hollow rotary shafts in front of and behind that are used as the rod entry and exit passages, the rod will surely advance along the center line between both tracks without any guide mechanism and exit without distortion. The center drive wheel is loosely fitted to the rotary shaft so that both the rotating tracks can be driven synchronously by driving the center drive wheel from the outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the equipment for carrying out the method of the present invention. Although not shown, there is a coil wound with a round bar material on the left side of the figure, and there is a peculiar straightening machine for pulling out the round bar material. The round bar material that came in enters the forming part 1 at the left end of FIG.
The forming part 1 is composed of a plurality of forming rollers 1 as shown in FIG.
By passing the round bar material through the material passage P surrounded by a, the cross section of the round bar is cold-formed into a square in this example. For this reason, strong pulling feed rollers 2 (FIG. 1) are arranged in a row.
The peripheral surface of each roller is formed into a V-shaped groove with an angle of 90 ° so that a rod having a square cross section can be held and driven. A measuring unit 3 for measuring the speed and the feed length of the bar is inserted between the forming unit 1 and the feed roller 2, which is a well-known equipment.

The bar material discharged from the feed roller 2 in FIG. 1 advances to the guide tubes 4 to 6. The guide tube 6 has its outer end fixed to the positioning support 5 as shown in FIG.
It is inserted in the hollow rotary shaft 11 of. At the tip of the guide tube 6, there is a square hole 7a of a fixed die 7 for preventing rotation of the bar material, and the bar material coming out of this is immediately gripped by the holding caterpillar 8 and twisted. Therefore, the rectangular straight rod becomes a twisted rod between the die 7 and the entrance of the caterpillar 8. The track surface 8a of the caterpillar shown in FIG. 4 is a tread surface for a round bar having an obtuse V groove, and holds a corner portion of a bar material 9 which has already been twisted. The tread 8a is originally a circumscribed circle 9a of the cross section (square) of the bar material 9.
Since it is a tread for sandwiching a round bar having a cross section,
Even if it is twisted as described above, it is reliably sandwiched at the cross-sectional positions of the solid line and the chain line in FIG.

The torsion feed device 10 of the present invention supports and rotates the entire holding caterpillar 8 with the bar 9 held by the tread surface 8a. This will be described with reference to FIGS. The main frame of this apparatus is a rotary machine frame 10, hollow rotary shafts 11 and 12 are attached to the front and rear parts thereof, and these are supported by bearings 11a and 12a. As shown in FIG. 3, the hollow rotary shaft 11 has the guide tube 6 having the above-mentioned fixed die 7 for rotation prevention attached to the tip thereof inserted thereinto and the chain wheel 13 fixed to the outside. The chain wheel 13 is rotated by a lower drive motor M as shown in FIG. 1, and rotates the entire rotary machine frame 10 via a hollow rotary shaft 11.

The rotary machine frame 10 has a sandwiched caterpillar 8 mounted therein, and a chain 14, a bevel gear 15, a spur gear 16 and the like as a transmission mechanism for driving both caterpillars. Therefore, the rotary machine frame 10 is moved by the chain wheel 13 at the left end of FIG.
When is rotated, each track transmission mechanism of the sandwiched track 8 also rotates together. The rotating drive mechanism is synchronously driven at a fixed position by the central drive wheel (chain wheel) 17 loosely fitted to the hollow rotary shaft 12 on the right side of FIG. 6 and the spur gear 18 attached thereto. The drive wheel 17 is driven by a motor (not shown) via the magnetic powder clutch C of FIG.

FIG. 7 is an explanatory view of drive systems of the rotary machine frame 10 and the sandwiched caterpillar 8. Motor M is a chain car 1
The entire rotating machine frame 10 is rotated via 3. The motor M ′ controls the torque by the magnetic powder clutch C to rotate the central drive wheel 17 and the spur gear 18 attached thereto, thereby synchronously driving the transmission mechanisms of both caterpillars. With this, the sandwiched caterpillar 8 rotates around the gripped bar while continuing the bar pulling operation,
Performs both twisting and feeding. Although one embodiment shown in the drawings has been described above, it is needless to say that the present invention can be variously changed and applied according to the implementation conditions without changing the gist thereof. In the above-mentioned embodiment, even a steel rod can be continuously formed without heating, but the method of the present invention is not limited to cold forming.

[0016]

EFFECTS OF THE INVENTION The twisting of a square rod or the like is a very simple process. However, it is extremely difficult to continuously form a long bar into a twisted bar. The method of rotating the guide hole while pushing the rod into the guide hole has a problem in the accuracy of twisting. On the other hand, the method of twisting while pulling the bar is
The problem was how to keep twisting the rod after twisting it. The present invention has succeeded by using the sandwiching caterpillar conventionally used for pulling a long rubber rod or the like as a pulling and twisting means for a steel rod or the like. The biggest problem was the shape of the track surface of the track that holds the twisted rod securely, but it was solved by considering the twisted rod as a round bar circumscribing it and using it as a round bar tread. .

The twisting and feeding device of the present invention fulfills a complex action of continuously feeding the rod material while twisting and rotating the rod material while twisting it. Since the sandwiching caterpillar that acts as a delivery mechanism has a long sandwiching portion, it was demonstrated that the twisting rod can be securely held by using the one for round bar and cold forming is possible. In order to drive both caterpillars synchronously while rotating the sandwiched caterpillar around the bar, a simple structure was proposed in which the central drive wheel was loosely fitted to the hollow rotating shaft that supports the rotating machine frame. According to the present invention, the technical and economical effects that enable continuous cold forming of a twisted bar for the first time are extremely large.

[Brief description of drawings]

FIG. 1 is an elevational view showing an example of equipment for carrying out the present invention.

FIG. 2 is an enlarged side view of a forming portion at the left end of FIG.

3 is a partially enlarged elevational view of FIG.

FIG. 4 is an explanatory diagram of a relationship between a tread surface of a sandwiched caterpillar and a twisted bar.

FIG. 5 is a perspective view of an example of a twist bar.

FIG. 6 is an elevational view of an embodiment of the twist feeding device of the present invention.

7 is an explanatory diagram of a drive system of FIG.

[Explanation of symbols]

 1 Forming Part 7 Fixed Die 8 Clamping Caterpillar 10 Torsional Feeder 17 Central Drive Wheel

Claims (3)

[Claims] 1. A long bar having a polygonal cross section inscribed in a circle is passed through a fixed die hole having substantially the same cross section, and a round bar having a diameter close to the diameter of the circle is gripped to leave the die. Continuously forming a twisted rod characterized by feeding a straight rod as a twisted rod between the die and the caterpillar by rotating the caterpillar around the rod while gripping and pulling it in Law. 2. The molding method according to claim 1, wherein the bar is formed by gathering the peripheral surfaces of a plurality of molding rollers.
Form a material passage of the same shape as the cross section of the target torsion bar,
A continuous forming method for twisted rods, characterized in that a long metal round rod is pulled out from the passage to obtain a required cross section by a feed roller capable of holding a straight rod having the above cross section. 3. A rotating machine frame having hollow rotating shafts at the front and rear portions, which serve as entrance and exit paths for rods to be twisted, and a bar between the entrance and exit paths mounted in the machine frame. A pair of caterpillars that grip and feed the material, a central drive wheel that is loosely fitted to the outer circumference of the hollow rotary shaft, and is driven by an external force to synchronously drive the pair of caterpillars via their respective transmission mechanisms, and the hollow rotary shaft. The caterpillar is provided with a machine frame drive mechanism for rotating the machine frame, and each tread surface of the caterpillar is a concave surface capable of holding a round bar having a cross-sectional size close to the circumscribed circle of the bar to be twisted. Plucking device.