JPS62197216A - Stationary type roller die for wire drawing - Google Patents

Abstract

PURPOSE:To obtain the roller die having high work accuracy by providing a pair of bearings shaft-fitting a roller inside the outer frame and by projecting from the outer frame the fixing bolt which fixes by press-fitting the adjusting bolt adjusting the gap of the mutual bearings and the mutual bearings. CONSTITUTION:The shaft 9 of a discoid roller 8 is fitted via a bearing 10 to the hollow part 7 at the center of the opposing face on a pair of bearings 6, 6 arranged inside the outer frame 1 and an adjusting bolt 3 is screwed on the bearing 6 of one part. In case of the operation, the gap of a flat face 6' each other is set after adjusting the flat face 6' of the bearing 6 on the same level with the contact face 11 of the roller 8 by the adjusting bolt 3. The drawing wire is passed through the hole 13 of the roller 8 in the state of applying a fixed pressure on the contact face 11 by fixing with the press-fitting of the bearing 6 each other by fastening the fixed bolt 2 screwed to the outer frame 1. In this way the roller die having high work accuracy of the wire and good production efficiency is obtd.

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, and more specifically relates to improvements in manufacturing equipment for manufacturing thin metal wires such as electric wires and wires. The present invention relates to a wire drawing roller die that gradually makes the wire thinner and circular in cross section by passing a metal wire through the die and repeating this sequentially from left to right and up and down.

[Conventional technology]

Conventionally, in order to draw the wire thinner, a hole die was used in which the metal wire was passed through holes of smaller diameter one after another, and the metal wire was passed between rollers whose four joints were formed into a circular shape, and the metal wire was gradually thinned by pulling force. was forming.

[Problem that the invention seeks to solve]

However, in the case of hole dies, large shear friction occurs between the die surface and the wire surface, making machining extremely difficult and reducing mass production efficiency.On the other hand, since the wire passes through a perfectly circular hole, machining accuracy is reduced. You can get good wire.

On the other hand, roller dies are easy to process because the friction generated between the die surface and the wire surface is rolling friction, but on the other hand, they have the contradictory drawback of low precision.

To explain in more detail the poor processing accuracy of this roller die, the roller die uses two pairs of rollers to roll and form wire rods, and the shaft of each roller rotates well. The wire rod is inserted into the bearing through a hair ring, and a reduction blade is added to this bearing to make the wire thin and circular.However, conventional roller dies provide a certain amount of gap between the facing surfaces of the rollers. . This gap is necessary to prevent the wire from curling out, but with this structure, if the thickness, tensile strength, and hardness of the material to be processed are completely uniform, the finished wire will have high dimensional accuracy. However, it is true that the conditions of the material require such a uniform material.''
In any case, it was impossible to avoid some variation in quality.

That is, when a wire is drawn with a roller die, the gap between the opposing surfaces of the rollers constantly moves slightly due to changes in the rolling stress of the wire itself, making it impossible to maintain a constant wire diameter.

In order to fundamentally improve these drawbacks, it is necessary to eliminate the gap between the pair of rollers. The present inventor previously filed a patent application for this proposal in Japanese Patent Application No. 6O-7O43SQ.

According to this proposal, since the rollers are self-propelled, the rollers themselves rotate by themselves while applying sufficient rolling force to the rollers, making it possible to obtain highly accurate wire rods without changing the rolling blade. did it.

However, even with such a device in which there is no gap between the facing surfaces of the rollers, the rollers themselves do not rotate by themselves, and when drawing the wire by drawing force, it is not possible to apply sufficient rolling force to the rollers, so the material Due to differences in tensile strength and hardness, the rollers may not rotate smoothly, and depending on the material, the pulling force may cause a change in composition due to distortion inside the metal.
Cutting occurred due to the tensile force, resulting in poor production efficiency and making it impossible to obtain a good wire rod with uniform precision.

The present invention eliminates this defect, and even with a roller die system in which the roller itself does not rotate by itself, it has the same excellent wire processing accuracy as a device in which the roller rotates by itself, and has extremely high production efficiency. The purpose of the present invention is to provide a good fixed roller die for wire drawing.

[Means for solving problems]

In order to achieve the above object, the present invention has an adjustment bolt screwed onto one of a pair of bearings on which rollers are respectively attached, and the adjustment bolt protruding from the outer frame is connected to the pair of bearings using a dial gauge. The rolling force is adjusted by adjusting the gap between the flat surfaces of the bearings, and a fixing bolt is used to press and fix the pair of bearings in the outer frame by applying pressure from the outside of the bearing to which the adjusting bolt is screwed. It is characterized by having

〔Example〕

One embodiment of the present invention will be described with reference to the drawings. 3 indicates a rectangular metal outer frame whose inner surface is formed into a flat surface, and fixing bolts 2 are screwed onto the upper surface and one side of the outer frame 1. It has a bolt hole 4 to be passed through and a through hole 4' to allow the adjustment bolt 3 to pass through it loosely, and furthermore, a large diameter opening 5 for passing a wire through is formed in each surface perpendicular to the side surface having the bolt hole 4. ing. Reference numeral 6 indicates a plurality of bearings, each of which is housed in a required number in pairs in the vertical and horizontal directions in the rectangular space formed by the outer frame 1, and 6' is a flat surface of the bearing.

The bearing 6 has a recess 7 formed in the center of the pair of opposing surfaces, and a disk-shaped roller 8 made of special steel connects both ends of a shaft 9 extending on both sides of the bearing 6 through a bearing 10. It is rotatably housed by being pivotally attached to the recess 7 of. The opposing flat surfaces 11 of the disc-shaped rollers 8 housed in the opposing recesses 7 are in contact with each other, and the rollers 8
A semicircular recess 12 is formed in the center of the outer periphery of the roller 8, and this recess 12 creates a substantially perfect circular hole 1 on the opposite surface of the roller 8.
3 is formed. Reference numeral 14 denotes an escape groove formed at the matching portion of the approximately perfectly circular hole.

Further, the fixing bolt 2 is screwed into the bolt hole of the outer frame 1 by carving a screw on the inner circumferential surface of the bolt hole A of the outer frame 1, and the length extending inward of the outer frame 1 allows the bearing 6 to be fixed. The applied pressure is changed. The bolt hole 4' of the outer frame 1, through which the adjustment bolt 3 is inserted, is simply a through hole, and one of the bearings 6 is provided with a threaded groove, and the adjustment pole 1-3 is screwed into this one bearing 6'. The gap between the flat surfaces 6 of the pair of bearings 6 is adjusted by the length of the adjusting bolt 3 passed through the roller 8, and the pressing force between the flat surfaces 11 of the rollers 8 is adjusted. This adjustment bolt 3 is the fixing bolt 2
By providing lll1lI on both sides of the bearing 6, the bearing 6 can be pressurized accurately and evenly.

[Effect]

Next, the operating structure of the present invention will be explained.

A shaft 9 of each roller 8 is rotatably attached to a bearing 6 via a hair ring 10. Adjustment bolt 3 is attached to one bearing 6
The bolt 3 has a knob protruding from the outside of the outer frame 1, and the rolling force can be adjusted using a dial gauge displayed around the knob. Assuming that the thread pitch of the adjustment bolt 3 is 1 mm, one rotation of the bolt corresponds to approximately 2.8 um as a scale of 1/360 displayed on the outer frame at 360 degrees.

Turn the adjustment bolt 3 to adjust the flat surface of the bearing 6 to be flush with the contact surface of the roller 8. When the fixing bolt 2 is tightened in this state, all the tightening force of the fixing bolt 2 is applied to the flat contact surface of the bearing.
’. For example, even if 1000 kg is applied to the pressing force of the fixing bolt 2, the entire pressing force is not applied to the roller surface 11, resulting in a no-load state.

Next, when the fixing bolt 2 is tightened with the adjustment bolt 3 slightly returned (minus the contact surface of the roller), a rolling blade is applied to the roller surface 11. In this case, the rolling blade applied to the roller surface 11 will be received by the hair ring 10, but it will be fixed with a constant pressure, and any pressure beyond that will be received by the entire flat contact surface of the bearing 6, and the roller surface No unnecessary pressure is applied to 11.

Example: When drawing wire with a material that requires a pressure of 100 kg/ca, if the pressure is adjusted to 110 kg/cnt using the adjustment bolt 3, then the tightening pressure of the fixing bolt 2 is set to 500 kg/cf. Even if the roller is raised and fixed, the surface pressure on the flat surface 11 of the roller is 110 kg/cf.
The flat contact surface of the bearing 6 receives all the remaining pressing force.

Therefore, even if there are tensile strength or other fluctuations inside the wire,
Since the rolling stress does not change and the wire is rolled with the holes 13 formed in the concave portions 12 of the roller using a predetermined rolling force that is constantly adjusted, the wire diameter is drawn under exactly the same conditions as when drawing with a hole die. A wire rod with high precision can be obtained without distortion caused by external stress occurring in the wire rod.

In addition, each bearing used has a specified bearing load, so it is only necessary to select the optimal bearing when designing the roller die.

For example, if the bearing load is 250 kg/cJ, four bearings are used at 20-lar, so the total bearing load is 250 kg x 4 = 1000 kg. If a rolling force of 200 kg/cJ is required with this structure, 2
Adjust the rolling force to 10 kg or more and about 250 kg, and increase the rolling force to 500 kg/c [if necessary, increase the rolling force to 510 to 250 kg/c].
Wire drawing can be performed smoothly by adjusting the R circumference to 550 kg.

The opening 5 of the outer frame 1 is placed between the rollers set in this way.
A wire rod obtained by cutting a flat plate from is inserted, and the wire rod is sequentially passed between a plurality of rollers 8 and rolled from above and below and from the left and right to obtain a wire rod of a predetermined shape.

〔Effect of the invention〕

As described above, according to the present invention, the pressing force of the roller can be freely adjusted and fixed, so even difficult-to-process metals, which was impossible with a roller die using tensile force, can be achieved with the same dimensional accuracy as a hole die. We have been able to provide an excellent roller die that allows wire drawing to be carried out without strain or deformation of the composition inside the metal, and which does not impair the excellent production efficiency that is a feature of roller dies. The value is extremely great.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a cutaway view,
FIG. 3AB is a front view and a side view of the bearing, FIG. 4 is an enlarged view of the main part of the roller in a pressed state, and FIG. 5 is an enlarged view of the main part of a part of the roller of a conventional roller die. 1.Outer frame, 2.Fixing bolt, 3.Adjustment bolt, 4
... Bolt hole, 5. Opening, 6. Bearing, 7. Recess.
8...Roller, 9...Shaft, 10...Bearing, 11...Flat surface of roller, 12...Recess, 13...
Hole, 14... Relief groove Patent applicant Shigenobu Ueno Figure 2 11 8 IQ Figure 3 A Figure 4 Figure 5

Claims (1)

[Claims] In a roller die that processes the wire material to a predetermined thickness by sandwiching it between a plurality of opposing rotating rollers from the top and bottom and left and right directions, a plurality of sets of pairs of bearings each having a roller attached thereto are placed outside. Arranged within the frame, one of the pair of bearings is screwed with an adjustment bolt for adjusting the rolling force of the wire rod by adjusting the gap between the flat surfaces of the pair of bearings, and the adjustment bolt protrudes from the outer frame, pressurizes one of the pair of bearings with the adjusting bolt screwed on from the outside, and screws a fixing bolt into the outer frame to press and fix the bearings together within the outer frame. Fixed roller die for wire drawing.