JPH0585622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an annealing apparatus for annealing welded wire rods made of high carbon steel or the like.

[Conventional technology]

After welding wire rods made of high carbon steel, etc., annealing is performed for the purpose of removing internal strain, refining crystal grains, and increasing ductility.

This type of annealing apparatus is equipped with a pair of clamp members, which hold the wire in tension. Further, the annealing device is provided with a current supply means, which supplies current to the wire held by the clamp member to generate heat in the wire to perform annealing.

In order to perform appropriate annealing, it is necessary to detect the temperature of the wire and adjust the energization to the wire based on this detected value. Therefore, an infrared sensor or the like is placed near the wire held by the clamp member, and the temperature of the wire is detected from the infrared rays emitted from the wire. Based on this detected value, the energization means is controlled to adjust the energization of the wire. It is possible to do so.

[Problem to be solved by the invention]

However, even if the wire is held in a tensioned state by the clamp member before being energized, the wire will expand and loosen due to thermal expansion when energized. Therefore,
The wire moves out of the detection position of the infrared sensor, making it impossible to maintain a constant distance between the wire and the infrared sensor. Therefore, accurate temperature detection is not possible,
There is a problem that proper annealing cannot be performed.

The present invention has been made by focusing on the above-mentioned conventional problems, and it prevents the wire rod from loosening due to thermal expansion.
It is an object of the present invention to provide an annealing device that can accurately detect the temperature of a wire and perform appropriate annealing.

[Means to solve the problem]

The present invention provides an annealing apparatus having a pair of clamp members that hold the wire in a bridged state, and an energizing means for annealing the wire by energization heating, in which the wire is stretched in the direction in which the wire is stretched by the distance that the wire extends when energized. Clamp member moving means for moving the clamp member; temperature detection means for detecting the temperature of the wire and arranged at a distance from the wire; and energization control for controlling the energization means based on the detected value of the temperature detection means. and means.

[Action of the invention]

According to the annealing apparatus of the present invention, the wire to be annealed is held by the clamp member, and the wire is energized to generate heat. At this time, even if the wire rod expands thermally and becomes slack, the clamp member moves in the direction of pulling the wire rod, and the wire rod is stretched and maintained in a straight state. The temperature of the wire is detected by the temperature detection means, and the energization control means controls the energization means based on this detected value to adjust the energization to the wire and perform appropriate annealing.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

A fixed side support plate 6 and a movable side support plate 7 are fixedly installed on the annealing equipment base 1, and a fixed side clamp member 2 and a movable side clamp member are disposed between the fixed side support plate 6 and the movable side support plate 7. 3 and a bearing plate 3a are movably arranged. Further, the fixed side clamp member 2 is slidably supported by shafts 5, 5. The movable clamp member 3 is slidably supported by shafts 5, 5, and is supported by a bearing plate 3a by connecting springs 8, 8.
is connected to. The connecting springs 8, 8 bias the movable clamp member 3 toward the bearing plate 3a by their elastic force. In other words, the connecting springs 8, 8 constitute a clamp member moving means.

A lock cam 9 is provided on the bearing plate 3a, and this lock cam 9 contacts the circumferential surface of the movable clamp member 3, so that the movable clamp member 3
It restricts movement toward a. The lock cam 9 can be rotated approximately 90 degrees clockwise from the state shown in FIG. 4 by a mechanism not shown, and can be rotated approximately 90 degrees counterclockwise from that state to return to the state shown in FIG. There is.

The feed screw mechanism 4 includes a handle 10 and a screw 4a.
, a bevel gear 4b connected to the handle 10 and the screw 4a, the stationary clamp member 2 and the bearing plate 3a.
It is constituted by screw holes 4c and 4d drilled in each of the holes. The screw 4a is threaded with a right-hand thread 4e and a left-hand thread 4f, with screw holes 4c and 4f respectively.
4d. Further, the movable clamp member 3 is provided with a hole 4g through which a screw 4a can be inserted. Therefore, the movable clamp member 3 moves together with the bearing plate 3a. Therefore, by turning the handle 10, the stationary clamp member 2 and the movable clamp member 3 can be brought closer or separated, and a desired distance between the stationary clamp member 2 and the movable clamp member 3 can be obtained. ing.

Fixed side clamp member 2 and drive side clamp member 3
Since they have substantially the same structure, only the stationary side clamp member 2 will be described with respect to the parts having the same structure, and the movable side clamp member 3 will be given the same reference numerals and the explanation thereof will be omitted.

Reference numeral 12 indicates a lower clamp stand, and an upper clamp stand 11 is attached to the upper surface of the lower clamp stand 12 so as to be swingable about a pin 13 as a fulcrum. A hollow portion 24 is formed in the lower clamp base 12, and a cam 20 is provided within the hollow portion 24 so as to be rotatably supported by a pin 21. A lever 22 that projects downward is attached to the cam 20. 1
Reference numeral 8 indicates a rod pin, and this rod pin 18 passes through the rear end of the upper clamp base 11 and is prevented from coming off by a nut 19.

A lower electrode 15 made of copper is provided at the tip of the upper surface of the lower clamp table 12 . In addition, the upper clamp stand 11 has an upper electrode 16 made of copper and a lower electrode 15.
is located opposite. Reference numeral 17 indicates a spring, and this spring 17 is attached to the upper clamp base 11.
is biased clockwise, that is, in a direction in which the upper electrode 16 opens. This urging force presses the tip end surface of the rod pin 18 against the circumferential surface of the cam 20, and this press contact restricts the opening of the upper electrode 16, so that the upper electrode 16 is normally pressed against the lower electrode 15. Furthermore, when the lever 22 is pulled in the direction shown by the arrow, the cam 20 rotates counterclockwise, the rod pin 18 is lowered by the biasing force of the spring 17, and the upper clamp base 11 is opened and the lower electrode 15 and upper electrode 16 are separated. A gap is starting to open between them.

The lower electrode 15 of the stationary clamp member 2 is connected to a transformer 30 as a current supply means, and the lower electrode 15 of the movable clamp member 3 is connected to the transformer 30 via a power supply control means 31. The energization control means 31 includes an infrared sensor 3 as a temperature detection means.
Connected to 2. The infrared sensor 32 is arranged at a position facing the wire S held by the stationary clamp member 2 and the movable clamp member 3. The infrared sensor 32 has a function of detecting the temperature of an object that emits infrared rays.

Next, using this annealing equipment, high carbon steel wire S
We will explain the process of annealing after welding. Although this embodiment deals with wire rods having a diameter of 0.1 mm to 2 mm, the annealing apparatus according to the present invention does not limit the diameter of the wire rods to this range.

The operation of holding the wire S in a state where it is bridged by the stationary side clamp member 2 and the movable side clamp member 3 will be explained.

Turn the handle 10 to move the stationary clamp member 2 and the movable clamp member 3, and determine the interval L according to the length of the wire S. Then, as shown in FIG. 5, pull the levers 22 of the fixed clamp member 2 and the movable clamp member 3 to open a space between the lower electrode 15 and the upper electrode 16, and insert both ends of the wire S between them. put in. Then, the lever 22 is returned to its original position, and the wire S is held between the lower electrode 15 and the upper electrode 16 of both clamp members 2 and 3, as shown in FIG.

Next, as shown in FIG. 7, the lock cam 9 is rotated 90 degrees clockwise, and the connecting springs 8, 8 apply an urging force to the movable clamp member 3 in the direction of pulling the wire S. That is, the wire S is pulled by the elastic force of the connecting springs 8, 8.

Then, the main switch of the annealing device is turned on, and the transformer 30, energization control means 31, and infrared sensor 32 are activated. Then, the wire S generates heat due to energization and expands due to thermal expansion. As mentioned above, the movable clamp member 3 is biased in the direction of pulling the wire S by the connection springs 8, 8, so it moves in the direction of pulling the wire S by the amount that the wire S has expanded. . Therefore, the wire S does not become slack as shown by the dashed line in FIG. 8, and the wire S is always kept straight.

At this time, the infrared sensor 32 detects the temperature of the wire S by detecting infrared rays generated from the wire S. Based on this detected value, the energization control means 31 controls the current flowing from the transformer 30 to the wire S via the electrodes 15 and 16 so that the wire 7 is annealed most appropriately.

In the above embodiment, the lock cam 9 is used to restrict and release the movement of the movable clamp member 3, but the present invention is not limited thereto, and an actuator using a solenoid may also be used.

Further, although the screw feeding mechanism 4 in the above embodiment moves the stationary side clamp member 2 and the movable side clamp member 3 by turning the handle 10, a pulse motor may be used instead of the handle 10. It is possible.

Further, in the above embodiment, one of the pair of clamp members is fixed and the other moves to pull the wire, but it is also possible to have a configuration in which both of the pair of clamp members move.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a clamp member moving means for moving the clamp member in a direction in which the wire is pulled during annealing, a temperature detecting means for detecting the temperature of the wire, and a detected value of the temperature detecting means. By providing the energization control means that controls energization based on the above, it is possible to always energize the wire in a straight state when energizing the wire. Therefore, the distance between the temperature detection means and the wire is always constant, and the temperature of the wire can be accurately detected. Therefore, accurate energization control becomes possible, and the wire can be appropriately annealed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of an annealing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 4,
FIG. 3 is a plan view of the annealing device shown in FIG. 1, FIG. 4 is a front view of the same, and FIGS. 5 to 7 are diagrams for explaining the work of holding a wire by the annealing device of the embodiment. , FIGS. 8 and 9 are diagrams showing a state in which the movable side clamp member moves as the wire expands when the wire is annealed by the annealing apparatus of the embodiment. 2... fixed side clamp member, 3... movable side clamp member, 8... connection spring (clamp member moving means), 9... lock cam, 30... transformer (energization means), 31... energization control means, 32 …
...Infrared sensor (temperature detection means).

Claims (1)

[Claims] 1. In an annealing apparatus having a pair of clamp members that hold the wire in a bridged state, and an energizing means for annealing the wire by energization heating, the clamp member is moved in a direction in which the wire is stretched by a distance that the wire extends when energized. a clamp member moving means for moving the wire, a temperature detection means for detecting the temperature of the wire and arranged at a distance from the wire, and an energization control means for controlling the energization means based on a detected value of the temperature detection means. An annealing device characterized by comprising: