JPS5930773B2 - Wire refining heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When the present invention supplies a wire material to a spring manufacturing machine such as a coiling machine to form a coil spring, the material wire material such as wire is passed through a predetermined temperature range just before the bending process. By doing so, residual strain inside the material is removed, warm processing is easily possible, and time loss is eliminated in accordance with the processing speed, making it possible to perform continuous refining of the material efficiently. It is something.

Various types of springs, such as Koinori springs, which are wound by coiling machines, etc., have residual machining strain inside the material, and therefore, the material is usually removed after the forming process in order to remove such machining strain. Heat treatment is performed for tempering.

By the way, this kind of processing strain includes the residual strain caused by the drawing process to thin a thick wire to give it hardness as a spring, and the residual strain caused by the drawing process to form the desired spring shape by bending it. There are two types of residual strain caused by bending.In the latter case, it is said that almost no residual strain is observed, especially when the radius angle of the bend is 4 to 5 times the wire diameter or more. There is.

Therefore, in this case, heat treatment is sometimes performed before bending, and these wires are usually called oil-tempered wires, and heat treatment after bending is not required.

However, in this case, it is necessary to increase the hardness during heat treatment, and a special heat treatment method is adopted, resulting in a material that has high hardness but is easily broken.

Moreover, the heat treatment time is usually 3 to 5 minutes, and thick wires (for example, 3 to 5 urns) require 8 to 15 minutes or more, so it is difficult to supply the spring to a spring manufacturing machine while continuously heat treating it. Alternatively, it was extremely difficult in terms of the installation location and space of the heat treatment furnace.

In other words, it takes a considerable amount of time to apply heat to the material wire from the outside and completely heat it to 300 to 500 degrees Celsius to the center.On the other hand, the production speed of spring manufacturing machines is usually 30 to 80 meters per minute. For example, if you want to hold the material wire in the heat treatment furnace for at least 3 minutes to heat treat it to the above temperature, you will need a furnace with a length of 30 to 80 m. Therefore, it is practically impossible to implement.

The present invention solves this problem by using a liquid with high heat transfer efficiency to allow the material wire to pass through a predetermined temperature range for the necessary time just before processing. .

The details will be explained below with reference to the embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a heating tank capable of containing a liquid 2 heated to an appropriate temperature, and inside the heating tank, a pair of front and rear heating windings are rotatably supported while being immersed in the liquid 2. It has a roller 3.4 and a pair of front and rear drying wrapping rollers 5.6 which are rotatably supported above the corresponding liquid surface and are rotatably supported like the rollers.

The heating tank 1 is provided with an inlet 8 at the upper part of its front wall 1a for introducing the wire 7 into the furnace, and an outlet 9 at the rear wall 1b opposite thereto for leading the wire out of the apparatus. ing.

The wire 7 is pulled out from the reel 10, guided through the inlet 8 of the heating tank 1 into the liquid 2 in the tank, and wound the necessary number of times between the front and rear winding rollers 3 and 4, which are immersed in the liquid and supported with their shafts. After
The liquid comes out from the front winding roller 3 to the front winding roller 5 for drying, is guided from there to the rear roller 6, and is wound between both rollers 5 and 6 the required number of times in the same manner as described above, and then sent to the heating furnace. 1 is led out to the tank through an outlet 9 in the rear wall 1b.

The wire rod 7 is pulled out from the liquid and wrapped around the drying roller 5.6.
When the liquid is exposed to air at the ambient temperature in the tank, it dries in the space above the liquid in the tank.

Furthermore, if heat is generated from the winding roller for drying, drying can also be accelerated by this heat.

Reference numeral 11 denotes a reserve tank attached to the lower part of the heating tank 1, and is used to allow the liquid 2 in the heating tank to be exchanged with each other.

Reference numeral 12 denotes a liquid supply pipe that sucks out the liquid in the preliminary tank 11 and sends it into the heating tank 1. A pump 13 is provided in the middle of the pipe, and when the pump 13 is started, the liquid is sucked in and pumped.

Reference numeral 14 denotes an extraction pipe for discharging the liquid 2 in the heating tank 1 into the reserve tank 11, and when the cock 15 is opened, the liquid is discharged into the reserve tank 11 by the drop of the liquid.

20 is a heater provided in the heating tank 1, which heats the liquid 2 in the tank to a required temperature and maintains it at the required temperature.

16 is a sealing lid of the heating tank 1.

In FIG. 1, a heat treatment device of the present invention is installed just before a coiling machine (automatic spring winding machine) 17, and a wire rod 7 unwound from a reel 10, which is called kneading, is passed through this heat treatment device and directly passed to the coiling machine 17. The state in which the coil springs are continuously being supplied and molded into coil springs is shown.

In the above configuration, when the wire rod 7 led out from the outlet 9 of the heating tank 1 is supplied to the coiling machine 17, the wire rod is intermittently fed by driving the wire feed rolls 18 and 19, so that the wire rod is sequentially pulled out from the heating tank 1. One coil spring is wound in each cycle.

However, in the heating tank 1, the wire rod 7 introduced from the inlet 8 is first immersed in the liquid 2 toward the heating rear winding roller 4, passes through the roller 4, and then passes between the wire rod 7 and the front roller 3. After being wrapped the required number of times, the wire exits the liquid from the front roller 3, passes through the front winding roller 5 on the liquid surface, and heads for the rear roller 6, so that the wire rod between the front and rear heating rollers 3 and 4 in the liquid By appropriately increasing or decreasing the number of windings in advance, the time during which the wire is immersed in the solution can be matched with the heat treatment time required for tempering, so that the wire rod is guided through the drying winding roller 5.6. By the time it is led out from the outlet 9, it has been heat-treated to the necessary and sufficient temperature and is dry, and the supply rate to the coiling machine 17 is completely consistent.

When the operation of the coiling machine is stopped and the work is completed, the subsequent wire remains in the heating tank 1 and its feeding is stopped.

Therefore, if the wire rod continues to be immersed in the liquid 2 in this state, the wire rod in the immersed part will be overheated and will cause problems.
After turning off the heater 20, turn off the cock 15 of the extraction tube 14.
is opened and the liquid 2 in the heating tank 1 is transferred into the reserve tank 11 through the extraction pipe 14.

When restarting operation, first start the pump 13, suck the liquid in the preliminary tank 11 through the liquid supply pipe 12, inject it into the heating tank 1 again, and stop the pump 18 when the predetermined amount is reached. let

Then, the heater 20 is energized to heat the liquid 2, and when it reaches a required temperature, feeding of the wire is started and the coiling machine performs the same operation as described above.

Incidentally, the heating winding roller 3.4 may have a heater incorporated therein, and in the illustrated example, the reserve tank 11 is provided at the bottom of the heating tank 1 and is stacked in two stages. In some cases, the configuration is such that they are placed side by side.

Further, although a pair of rollers 3.4 and 5.6 are provided in the heating tank 1 at the front and rear, intermediate rollers or guide rollers may be provided in some cases, and the manner in which the wire is wound may be changed as appropriate other than the example shown. Subject to change.

As described above, the present invention involves a method in which a wire introduced from the outside into a heating tank containing a liquid heated to an appropriate temperature is wound around a heating winding roller to a required length and immersed in the liquid.
It is made so that it can be drawn out from the liquid, sent out to the outside of the heating tank via a drying winding roller, and then supplied directly to spring manufacturing machines such as coiling machines, so it can be bent. Residual strain that occurs during wire drawing is effectively removed, and the processability is improved by performing warm processing through heat treatment.
Not only is the fatigue resistance of the material reduced, making it easier to obtain products with excellent spring properties, but the heat treatment takes a sufficient amount of time in the heating tank to match the operating capacity of the spring manufacturing machine. Since it is wrapped around a roller, there is no time loss, and the size and length of the heating tank can be as small as one meter, and furthermore, the material can be several tens of meters long. It can be kept at all times, but when setting materials in the heating tank or when the operation is stopped, the liquid in the heating tank can be drained into the reserve tank and used as needed. Since they can be replaced with each other as required, they are very convenient to handle, have a simple structure, are free from failure, and can be implemented at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and the first embodiment is shown in the drawings.
The figure is a side view of a state in which it is attached to a spring manufacturing machine and is in operation, and Figure 2 is an enlarged longitudinal sectional side view of the tempering heat treatment furnace of the present invention.
FIG. 3 is a cross-sectional plan view of the same. 1...Heating tank, 2...Liquid, 3.4.
...Heating winding roller, 5.6...Drying winding roller, 7...Wire rod, 8...Introduction port, 9... ...outlet, 11...preparation tank, 12...liquid supply pipe, 14...extraction pipe.

Claims (1)

[Scope of Claims] 1. Heating winding in which a wire rod introduced from the outside is wound to a required length in a heating tank capable of containing a liquid heated to an appropriate temperature, immersed in the liquid, and then transferred. The heating tank is equipped with a drying wrapping roller that takes out the heated wire from the liquid, wraps it in the space above the liquid for a required period of time, air-dries it, and then sends it out of the heating tank. 1. A wire tempering heat treatment device, characterized in that it is equipped with a reserve tank in which the liquid therein can be exchanged. 2. A heating winding roller that wraps a wire introduced from the outside for the required length into a heating tank capable of containing a liquid heated to an appropriate temperature, and immerses it in the liquid. and a drying winding roller for leading out the wire rod from the liquid, winding it in the space above the liquid for a required period of time, drying it in air, and sending it out of the heating tank after drying.
The heating tank is provided with a reserve tank in which the liquid therein can be exchanged with each other, and a liquid supply pipe and a heating tank are provided to connect the heating tank and the reserve tank to suck out the liquid in the reserve tank and send it into the heating tank. 1. A wire tempering heat treatment apparatus, characterized in that the liquid in the inner tanks is connected to each other by extraction pipes that introduce liquid into a preliminary tank. 3. In a heating tank capable of containing a liquid heated to an appropriate temperature, a wire rod introduced from the outside is wound for the required length and immersed in the liquid. and a drying winding roller for leading out the wire rod from the liquid, winding it in the space above the liquid for a required period of time, drying it in air, and sending it out of the heating tank after drying.
The heating tank is provided with a reserve tank in which the liquid therein can be exchanged with each other, and a liquid supply pipe and a heating tank are provided to connect the heating tank and the reserve tank to suck out the liquid in the reserve tank and send it into the heating tank. The heating tank is equipped with a heater that heats the liquid in the heating tank to a required temperature. .