JPH07124627A - Wire drawing device - Google Patents

Abstract

PURPOSE:To perform the measuring the length of a drawing material with high precision, in the travelling course of a wire rod, by arranging a measuring roller between a pair of take-up capstan and guide rollers and dancer rollers to control a take-up tension. CONSTITUTION:A take-up capstan 1 is arranged behind the last die 3 together with a guide roller 2 in the paired position, comprising a take-up mechanism for taking up a drawing material W. Dancer rollers 4, 4 are for controlling a take-up tension, and one of the rollers moves vertically so as to control the tension of the drawing material W within a specified range. In addition, a measuring roller 5 for measuring the drawing material is provided between the take-up mechanism consisting of the take-up capstan 1 and a guide roller 2 and the dancer roller 4. The guide roller 6 is in a position paired with the measuring roller 5 and is wound a few times so as not to cause the slippage of the wire drawing W on the measuring roller 5. Thus, the quantity for extra length is reduced, and a burden is mitigated for the unwinding operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a drawing die,
The present invention relates to a wire drawing device for reducing the diameter of a wire rod, and particularly to a wire drawing device capable of improving the measuring accuracy of the wire rod.

[0002]

2. Description of the Related Art Generally, a measuring mechanism for measuring a traveling wire rod of this type has a structure as shown in FIG. 4, in which a shaft 12 of a measuring roller 11 is fixed to a support base 13 and the measuring roller 11 is fixed. A reaction plate 14 is attached to the reaction plate 14 that rotates with the measuring roller 11 as the wire drawing material travels.
The pulse length is detected as a pulse number, and the pulse length is counted by the counter 16 to obtain the passage length of the wire drawing material.

As shown in FIG. 2, a schematic construction of a conventional wire drawing apparatus is such that a take-up capstan 1 and a guide roller 2 are arranged behind the final die 3 so as to have a paired positional relationship, and further rearward thereof. In general, the dancer rollers 4 and 4 are installed. The guide roller 2 provided in pair with the take-up capstan 1 also serves as a measuring roller in the measuring mechanism. The take-up capstan 1 is used to pull out the wire rod W from the die 3, and the guide roller 2 stabilizes the take-up tension and relieves tensile, compression, and bending stress applied to the wire-drawn rod W. The wire drawing material W is wound several times between the guide roller 2 and the take-up capstan 1.

[0004]

However, there is a considerable difference between the measured value and the measured value of the drawn wire obtained by the above-mentioned conventional measuring means, and the measuring accuracy is poor. In addition, since the length of the drawn wire material has been lengthened from the viewpoint of productivity and workability, there is a background that the tendency that the measuring accuracy is lowered is easily promoted.

For this reason, it is generally practiced to wind the wire drawing material around the reel with a considerable margin (hereinafter referred to as "extra length") larger than the set length, but the extra length increases. This is wasteful in terms of cost, and the work of unwinding the wire drawing material remaining on the reel is extremely complicated.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to make it possible to measure with a high degree of accuracy, to reduce the cost due to the reduction of the extra length, and to solve the problem. An object of the present invention is to provide a wire drawing device equipped with a measuring mechanism capable of reducing the work load.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have conducted various investigations and researches on the cause of reducing the measuring accuracy of the wire drawing material, and as a result, the take-up capstan and the measuring roller which are the measuring parts. It was clarified that the high tension of the wire drawn on the and several times and the large variation of the tension greatly affect the measuring accuracy.

That is, generally, when drawing a wire drawing material with a die, a drawing force of about 5500 g is required. The actual value of the tension distribution of the wire drawing material in the drawing mechanism based on this drawing force is shown in FIG. The tension in each of A to E of the drawn wire W wound between the capstan 1 and the guide roller (measuring roller) 2 is A part = about 5500 g, B part = about 5000 g, C part = about 4500 g, Part D = approx. 300
0g, E part = about 900g, average about 3800g
It is a degree. The value of the above-mentioned pulling force fluctuates depending on the setting conditions such as wire drawing workability and tensile strength, and also changes due to die wear, elongation of the wire rod and the like. Therefore, the tension of the drawn wire also varies.

By the way, there is a close relationship between the tension applied to the wire and the elongation of the wire. Looking at the wire drawn material, about 3000 g gives 0.41% and about 4000 g gives 0.5.
The elongation is 0.69% at 5% and about 5000 g, and the higher the tension, the higher the elongation.

Considering the conventional measuring means from this point of view, it means that a wire drawing material having a very large elongation and a large fluctuation in elongation is measured, and as a result, the measured value is the actual value of the wire drawing material. It is much larger than the length, and the variation is very large.

Based on the above findings, the inventors of the present invention can measure the drawn wire material at a place where the tension applied to the drawn wire material is low and the variation is small, so that the final drawn wire material can be approximated to the actual length. Therefore, the present invention has been accomplished.

That is, the gist of the wire drawing apparatus of the present invention is that between the take-up capstan and the guide roller and the dancer roller that controls the take-up tension in a pair of positions in the traveling path of the wire rod, the measuring roller is provided between the take-up capstan and the guide roller. In the wire drawing device.

[0013]

[Operation] The wire drawing material, which has passed through the final die and is applied with a high drawing tension, is wound several times between the take-up capstan and the guide roller at the paired position, and passes through the measuring roller with a stable low tension. Then, it is taken up by the take-up reel via the dancer roller. In this way, since the tension of the wire drawing material in the measuring roller is low and stable, the variation in elongation and the elongation value are small, and it is possible to measure the length closer to the actual length.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a main part of a wire drawing device of the present invention. In the figure, reference numeral 1 denotes a take-up capstan, which is arranged behind the final die 3 together with the guide rollers 2 in a paired position, and a take-up mechanism for taking-up the wire drawing material W by the take-up capstan 1 and the guide rollers 2. Constitute. Dancer rollers 4 and 4 control the winding tension, and one roller moves up and down so as to control the tension of the wire drawing material W within a certain range. The above structure is the same as the conventional one, and the feature of the present invention is that a measuring roller 5 for measuring the drawn wire is provided between the dancer roller 4 and the pulling mechanism including the pulling capstan 1 and the guide roller 2. In point. Reference numeral 6 is a guide roller which is in a position paired with the measuring roller 5 and prevents the drawn wire W from slipping on the measuring roller 5 and from trampling the measuring roller 5.
The wire drawing material W is wound several times between and and the guide roller 6. A measuring mechanism having a configuration as shown in FIG. 4 is provided in the vicinity of the measuring roller 5, and the vertical positional relationship between the measuring roller 5 and the guide roller 6 may be opposite to that in FIG. If there is no fear of problems such as stepping, guide roller 6
Is unnecessary.

Next, in order to confirm the effect of the wire drawing apparatus of the present invention, an experimental machine was manufactured by modifying the wire drawing apparatus of the above embodiment. A modification of the apparatus shown in FIG. 1 in the experimental machine is that the guide roller 2 is replaced with a measuring roller. In this experimental machine, measuring sections are provided at two positions.
Then, a wire rod having a wire diameter of 1.2 mm was drawn to a final wire diameter of 0.25 mm and a wire drawing length of about 152000 m by continuous wet drawing. The tension of the wire drawing material at the measuring roller in this wire drawing,
Table 1 below shows the measuring length (measured by the counter), the measured length (measured by the measure), the difference between the measured length and the measuring length, and the measuring accuracy. In addition, the case where the roller 2 is a measuring roller is a conventional example, and the case where the roller 5 is a measuring roller is an example.

[0016]

[Table 1]

As is apparent from Table 1, it is understood that the embodiment has a higher measuring accuracy than the conventional example and the variation thereof is small. In Table 1, the average value of the scale accuracy in the example is 0.0356% and the standard deviation is 0.0073, whereas the average value of the scale accuracy in the conventional example is 0.
4674% with a standard deviation of 0.0514.

[0018]

As described in detail above, the wire drawing apparatus of the present invention can measure the drawn wire material with high accuracy, so that the amount of extra wire is significantly reduced, the cost is reduced, and the wire-loading work load is reduced. There is an effect such as being able to do.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a wire drawing device of the present invention.

FIG. 2 is a schematic configuration diagram showing a main part of a conventional wire drawing apparatus.

FIG. 3 is a perspective view showing a winding state of a wire drawing material in a take-up mechanism.

FIG. 4 is a schematic configuration diagram of a measuring mechanism.

[Explanation of symbols]

 1 ... Take-up capstan 2 ... Guide roller (measurement roller) 3 ... Final die 4 ... Dancer roller 5 ... Measurement roller 6 ... Guide roller W ... Wire drawing material

Claims (1)

[Claims] 1. A wire drawing apparatus comprising a measuring roller arranged between a take-up capstan and a guide roller, which are paired with each other, and a dancer roller for controlling a winding tension, in a traveling path of the wire.