JPH0579409B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to improvements in manufacturing equipment for manufacturing thin metal wires such as electric wires and wires. The present invention relates to a roller die for wire drawing in which a hole is formed, a metal wire is passed through the hole, and the wire is gradually made thinner and circular in cross section by repeating this process sequentially from left to right and up and down.

[Conventional technology]

There are two types of dies used for wire drawing.
One is a hole die and the other is a roller die.

A hole die is a die with a precise hole drilled in a very hard material such as cemented carbide or diamond, and the diameter of the wire is reduced by passing the wire through this hole and pulling it out. The advantage of a hole die is that the finished wire diameter is highly accurate, but it has the disadvantage that it can be difficult to process depending on the type of metal because very high sliding friction occurs on the contact surface between the wire and the die during processing. ing.

For this reason, in the case of metal wire rods that are difficult to process, it is necessary to perform various preliminary treatments on the surface of the wire rods. For example, stainless steel wire requires resin coating, titanium wire requires preliminary treatment such as oxide coating, and even if these complicated treatments are applied, the wire drawing speed is low, such as Compared to copper wire, etc., it is less workable and less productive.
There were many problems in terms of economics. On the other hand, with roller dies, the friction that occurs between the wire rod and the die surface during processing is rolling friction, so there is no difficulty in processing depending on the type of metal, and any metal wire can be drawn without pre-treatment. It was possible.

[Problem that the invention seeks to solve]

However, when using a roller die, it is difficult to adjust the pressure to obtain the wire diameter accuracy of the wire rod during processing, and as a result, the accuracy of the finished wire rod is poor. In other words, conventionally used roller dies use a pair of grooved rollers to roll the wire rod to reduce the wire diameter, but the basic structure is a pair of grooved rollers set opposite each other. Also, this roller is attached to a bearing frame with a bearing attached to the shaft part.

The roller set in this manner is provided with a mechanism that can be moved into and out of the bearing section, and presses the wire directly with the bolt. The groove of the roller is approximately semicircular, and the wire diameter and draw-down rate are designed and manufactured. A roller die is used by combining four to six pairs of groove-shaped rollers set in this manner alternately at an angle of 90° and then bonding them together.

The groove of the roller is "oval" from the side where the wire enters.
Work is done through processes called "round" and "sizing."

``Oval'' is a roller for the purpose of reducing the cross-sectional area of the wire, and the amount of work is large, so the pressing force is also large.

"Rounding" is a preliminary work for "sizing" to ensure the wire diameter accuracy of the finished wire, and as much as possible,
This roller is used to bring the wire to a diameter close to the finished wire diameter.

The ``sizing'' roller is used to ensure the wire diameter accuracy of the finished wire, and is the most important roller in the wire drawing process using roller dies. This roller has a very small reduction in area, and therefore requires delicate adjustment of the pressing force. This tendency becomes stronger as the wire diameter becomes thinner, and in general, the area reduction rate in sizing rollers for wires with a wire diameter of 1 mm or less is a delicate amount, and therefore the tightening pressure with bolts is applied with a very weak force. The pressure must be adjusted (see Figure 8).
This caused the bolts to loosen due to vibrations during the wire drawing process, resulting in poor wire diameter accuracy. Furthermore, finishing accuracy for small diameter wires requires accuracy on the micrometer level, but it has been virtually impossible to achieve this by tightening bolts. That is, the conventional roller die has the disadvantage that it is very difficult to achieve wire diameter accuracy by adjusting the pressure.

Furthermore, with a roller die, the grooves of a pair of opposing rollers must always maintain a state in which their centers are aligned, but during wire drawing, the rollers are constantly forced to move laterally. (thrust load). Due to the structure of current roller dies, it is not possible to install a thrust bearing to stop this load. For this reason, in conventional roller dies, the grooves of the rollers are misaligned, which also impairs the accuracy of the wire diameter.

The present invention has been made in view of the above, and has a mechanism for accurately positioning the vertical and horizontal center points of the grooves of opposing rollers, and a device for preventing thrust action of the rollers, thereby achieving good wire diameter accuracy. The purpose is to provide roller dies.

[Means for solving problems]

In order to achieve the above object, the present invention has a roller die that processes a wire material into a predetermined thickness by sandwiching the wire material between a plurality of opposing rotating rollers from above and below and from the left and right, and applying pressure using a pressure bolt. A pair of precisely polished preload pieces is provided between the pair of bearings, and thrust bearings are installed at both ends of the roller shaft, and a , is characterized by being equipped with an adjustment washer.

〔Example〕

One embodiment of the present invention will be explained with reference to the drawings.
1 shows a metal outer frame with a rectangular space formed therein, and the outer frame 1 is constructed by fixing a top plate 2 to a bottom plate 4 via side plates 3 with bolts. Furthermore, pressure bolts 5 are screwed onto the top plate 2 and side plates 3 of the outer frame 1. Reference numeral 6 indicates a pair of bearings provided in the upper and lower directions within the rectangular space formed by the outer frame 1, and a pair of preload pieces 7, 7 are arranged between the flat parts at both ends of the bearings 6, 6. There is. The bearings 6, 6 have a space formed in the center by a pair of opposing surfaces and left and right preload pieces 7, 7, and a pair of disc-shaped rolling rollers 8 made of special steel.
However, both ends of the shaft 9 extending on both sides are connected to the bearings 6, 6 via the bearings 10 to the shaft shaft 9a.
It is pivoted and rotatably housed. 1
1 is a shaft 9a of the shaft 9 and a thinner shaft 9b
The washer 11 has a thrust bearing 12 at the opposite end of the shaft step that rotates in the same direction as the shaft.
is installed. The outer periphery of the rolling roller 8 is formed into a flat surface 13, and a semicircular recess 14 is formed in the center thereof, and this recess forms a substantially circular hole 15 on the opposing surface of the roller 8. be done. The rollers formed in this manner are sequentially arranged at an angle of 90 degrees in the vertical direction and the horizontal direction, and are housed inside the outer frame 1.

[Effect]

Next, the working structure of the present invention will be explained. The shaft 9 of each rolling roller 8 has a bearing 10
It is pivotally attached to the bearing 6 via. Preload pieces 7 are arranged on the flat surfaces on both sides of the bearing 6 facing each other. By improving the dimensional accuracy of the flat surfaces of the preload piece 7 and the bearing 6, a highly accurate wire rod can be obtained. That is, metal frame 1
The height of the bearing 6 and the width and height of the preload piece 7 are precisely polished and adjusted so that the center point of the wire is placed at the midpoint of the outer frame 1 using the inner surface of the wire rod as a reference plane.

Adjustment of the lower bearing 6 is performed using the recess 1 of the rolling roller 8.
Set the center point of the wire diameter from the seam 4, calculate the calculated thickness of the lower bearing, and adjust the dimensions by precision polishing the contact surface of the lower bearing with the outer frame 1. It is something. The adjustment of the preload piece 7 is calculated from the state where the center point of the groove of the rolling roller 8 is placed at the center point of the outer frame 1.
Accurate dimensions can be obtained by calculating the width and precision polishing.

Next, the height of the preload piece 7 is adjusted. This height adjustment is performed by precision polishing after setting the wire diameter to be rolled in advance. Adjustment and polishing of these bearings 6 and preload pieces 7 is carried out each time by repeating actual wire drawing tests and precision polishing. The bearings 6 and preload pieces 7 thus adjusted are arranged in the outer frame 1 as shown in the figure.

The upper bearing 6 is for the purpose of preloading the preload piece 7 with the pressure bolt 5, and creates a certain distance between it and the inner surface of the outer frame 1, and allows the wire material to freely move before being pressurized. It is for insertion.

Further, the center adjustment of the grooves of the opposing rolling rollers 8, 8 can be set accurately by adjusting the thickness of adjusting washers 11 mounted on both side steps of the shaft 9. Further, a thrust bearing 12 is attached to the outside of this adjustment washer 11, and this thrust bearing 12
rotates in the same direction as shaft 9. This washer 11 and thrust bearing 12 prevent the grooves of the rollers 8, 8 from shifting, that is, the force that would cause the rollers to move sideways, and the rollers are always held in a fixed position. This prevents misalignment between the grooves.

As described above, according to the present invention, the pressing force of the roller 8 is obtained by the strong preload of the preload piece 7.
The dimensional accuracy of the rollers 8, 8 becomes extremely good.
Furthermore, by installing the adjusting washer 11 and the thrust bearing 12 on the shaft portion 9, the thrust load on the roller 8 is prevented, lateral deviation is eliminated, and the dimensional accuracy of the wire diameter is extremely good.

As described above, the present invention overcomes the drawbacks of the conventional roller die and exhibits its advantages, making it possible to easily obtain a metal wire with excellent roundness and uneven diameter using the roller die. This will greatly contribute to Japan's industry.

[Brief explanation of the drawing]

FIG. 1 is a cutaway sectional view of one embodiment of the present invention, FIG. 2 is a plan view showing the arrangement of rollers, FIG. 3 is a perspective view, FIGS. 4A and 4B are exploded perspective views of the outer frame, and FIG. Figure 5 is a perspective view of A preload piece and B bearing, Figure 6 is a perspective view of rolling roller A, adjustment washer B, and thrust bearing C, and Figure 7 is a diagram showing the center of the roller groove (A is normal, B is Abnormality), Figure 8 is a diagram showing the area reduction rate in a roller die, A is a diagram showing the relationship between the wire diameter and the finished wire diameter, and B to G are lines due to the process of finishing the wire into a finished wire using rollers. It is a figure showing the state where a diameter changes. still,
In the figure, 1...Outer frame, 2...Top plate, 3...Side plate, 4
... Bottom plate, 5 ... Pressure bolt, 6 ... Bearing, 7
... Preload piece, 8 ... Rolling roller, 9 ... Shaft, 10 ... Bearing, 11 ... Washer,
12...Thrust bearing, 13...Flat surface of rolling roller, 14...Same recess, 15...Same hole.

Claims (1)

[Claims] 1 From the top and bottom and left and right directions for the wire material to be processed,
In a roller die that is sandwiched between a plurality of opposing rotating rollers and processed to a predetermined thickness, a pair of preload pieces are installed between a pair of bearings that are pressurized by a pressure bolt, and a pair of preload pieces are installed between both ends of the roller shaft. A fixed roller die for wire drawing, in which a thrust bearing is attached to the section, an adjusting washer is attached between the thrust bearing and the stepped section of the roller shaft, and all of these are housed within an outer frame.