JPH0347611A - Member to be worked of high melting point for bar stock and working method of bar stock using it - Google Patents

Abstract

PURPOSE:To enable increasing reduction ratio of one time by providing grooves on the peripheral surface of a pair of rolls and forming those grooves elliptic and triangular shapes. CONSTITUTION:Elliptic grooves 21, 23, 25, triangular grooves 22, 24 and a semicircular groove 26 for finishing are provided on a rolling roll 7a in the circumferential direction and those grooves are alternately and successively provided in the longitudinal direction of the roll. Also on the other rolling roll 7b, the similar grooves are formed symmetrically to the rolling roll 7a. In alternately repeating work using the triangular grooves 22, 24 and the elliptic grooves 21, 23, high reduction ratio can be adopted. Therefore, man-hour for working and numbers of heating can be remarkably decreased and respectively different and various working is possible with only one rolling device.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a rolling roll for processing bars of high melting point metals such as tungsten and molybdenum, a guide member for guiding the bars to the rolling rolls, and a guide member for guiding the bars to the rolling rolls. This invention relates to a processing method using a rolling roll.

[Prior Art] Conventionally, bar materials made of high-melting point metals such as tungsten and molybdenum have been processed through steps as shown in FIG.

In this figure, it is assumed that a bar material 72 weighing approximately 4 kg is processed as a raw material.

In this operation, first, an operator grabs a red-hot bar 72 from the heating furnace 71 with a shovel, and manually inserts it into the rolling roll section 73 of the grooved rolling device at the front (on the left side with respect to the rolling rolls in the figure). Processing was carried out by taking it out from the rear of the thrust (in the figure, on the right side with respect to the rolling roll).

The rolling roll section 73 of this grooved rolling device has a pair of rolls arranged above and below in the figure, and each roll has a plurality of grooves arranged in parallel in the length direction along the circumferential direction. ing. The valley grooves have approximately semicircular shapes of different sizes in cross section, and the number of grooves is usually 4 to 5. During rolling, the red-hot rods are successively passed through the valley grooves and rolled into the final wire rod. This was done by placing the roll in the grooves of the roll, rolling it down two or three times while checking the rolling scale, and then plunging it again.

Then, the bar 75 that has reached the rear table 74 behind the rolling roll section 73 is raised by the rear table 74, is grabbed, and is processed until it finally reaches a diameter of about 20 mm.

Next, this rolled bar, which has been heated in a heating furnace 76, is swaged in a large swaging machine 78 so that it reaches a diameter of about 16 mm.

Furthermore, in the same way as the processing by this large swaging machine, the swaged bar is again put into the heating furnace and finished to a diameter of about 12 mm by a small swaging machine.

This processing process, from the bar material to the finished product, took about a week depending on the processing equipment and operator's convenience.

[Problems to be Solved by the Invention] In the above-mentioned bar processing process, the processing rate cannot be increased in processing using a rolling roll section having a roll provided with semicircular grooves, so efficiency cannot be improved. do not have. Furthermore, machining using a swaging machine does not have a high machining rate, making it inefficient and, furthermore, requiring maintenance and management costs.

In addition, since processing is performed using three types of equipment, it takes several days to set up each equipment, and in addition, an extremely large amount of dust is generated during processing.
Another disadvantage was that the working environment was very poor.

Therefore, the technical problem of the present invention is to provide a high-melting point metal that has a simple processing method, does not require skill, can shorten the number of processing steps, and can significantly reduce costs and shorten delivery times. Rolls for bar processing.

It is an object of the present invention to provide a guide member used in this rolling roll and a rolling method using the guide member.

[Means for Solving the Problems] According to the present invention, a pair of rolling rolls which are provided facing each other and have grooves on the outer circumferential surface for processing a bar material of a high melting point metal, wherein the grooves are A rolling roll for processing a bar of high melting point metal is obtained, which is characterized by having an elliptical shape and a triangular shape.

According to the present invention, there is provided a processing method using the above-mentioned rolling roll for processing a bar of high-melting point metal, characterized in that rolling processing using the elliptical and triangular grooves is performed alternately. A bar processing method is obtained.

According to the present invention, the guide member is provided with a penetrating guide groove in order to supply the refractory metal bar to the groove provided in the rolling roll for processing the refractory metal bar,
A guide member for processing a bar of a high melting point metal is obtained, wherein the guide member is provided movably in the length direction of the rolling roll.

[Function] In the high melting point metal bar processing apparatus of the present invention, the rolling means has a pair of rolling rolls facing each other, and the rolling roll has a plurality of elliptical and triangular grooves on its outer peripheral surface. The grooves are provided and processed in the radial direction by being sequentially passed through the grooves.

The guide member of the present invention is provided with a guide groove for supplying a bar material to the groove provided in this rolling roll, and is provided so as to be movable in the length direction of this rolling roll.

In the method for processing a refractory metal bar using the refractory metal bar processing roll of the present invention, processing using the elliptical and triangular grooves of the roll is performed alternately, and the processing rate is - times. significantly increase.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram schematically showing the configuration of a refractory metal bar processing apparatus according to an embodiment of the present invention.

In this figure, the high-melting point metal bar processing apparatus includes an inlet guide 3 for guiding and feeding the red-hot bar 2 taken out from the heating furnace 1, and A pair of rolling rolls 7 to be processed (to narrow the diameter)
a and 7b, and a rear side disposed on the rear side of this rolling roll section 7, on which a rolled bar 2' can be placed and this bar 2' can be transferred in the vertical direction. Table 9 and
An exit guide 8 that is interposed between the rolling roll portion 7 and the rear table 9 and guides the rolled bar material to the rear table 9.
and position detection sensors 11, 11, which are arranged further behind the rear table 9 and detect the presence or absence of the bar 2'' placed on the table 9.

Further, above the front of the artificial side guide of the rolling roll part 7, a dust hood 5 is provided for sucking the dust generated from the bar material.
Slightly below this dust hood 5 and in front of the rolling rolls, a side dust collection hood 6 is arranged, and above the rear table 9, dust prevention means such as a dust prevention hood 10 are arranged. Furthermore, a lower local hood 4 is arranged directly below the entrance side guide 3, and upper local hoods 12, 12- are arranged above each of the artificial side guide 3 before and after the rolling roll part 7 and the exit side guide 8, respectively. There is. The position detection sensor 11 provided at the rear of the rear table 9 is composed of a pair of light emitting elements and light receiving elements in order to detect the presence or absence of a bar placed on the rear table 9.

A case in which a refractory metal bar is rolled using a refractory metal bar processing apparatus having such a configuration will be described with reference to FIG. 1.

In FIG. 1, the rod 7 material 2 taken out from the heating furnace 1 is inserted into the entrance side guide 3.

At this time, the generated dust is first sucked by the upper dust collection hood 5 and the side dust collection hood 6.

The bar 2 guided by the inlet guide 3 is inserted into a groove (
Processed using hole mold).

The processed bar 2' is guided and straightened by an exit guide 8, and is discharged onto a rear table 9. The dust generated at this time is sucked by the upper dust collection hood 10.

When the sensor 11.11 detects the presence or absence of the rolled bar 2', the rear table 9 is raised.

The raised bar 2°° is grabbed and returned to the entrance guide 2.
It is input from

Such operations are repeated. Most of the dust generated during this repeated operation is sucked by the upper local hood 12.12= and the lower local hood 4. As a result, there is no hindrance to work, safety and health are greatly improved, and stable operations can be maintained.

FIG. 2 shows the grooving roll 7a of FIG. 1.

7b is a partial cross-sectional view showing an example of FIG.

In this figure, the rolling roll 7a is made of a composite ductile roll (centrifugally cast product), and the core material is made of high-strength ductile cast iron made of mainly Ni with additions of Mo-Cr, etc. to prevent breakage. The material (inner layer) is made of high-alloy grain cast iron, which is made mainly of Mo with additions of CrNi, etc., as the skin material (outer layer) to provide resistance to high-melting point metals.

This rolling roll 7a is provided with elliptical grooves 21, 23° 25, triangular grooves 22, 24, and finishing semicircular grooves 26 in the circumferential direction, and in the longitudinal direction of the roll (left-right direction in FIG. 2). ) are arranged alternately.

The rolling roll 7b also has grooves similar to those of the rolling roll 7a formed symmetrically with the rolling roll 7a.

Note that the elliptical groove 25 is an elliptical groove for characteristic matching. These triangular grooves 22, 24. The alternating and repeated machining of elliptical grooves 21 and 23 is faster than conventional machining using only semicircular grooves.
Since the processing rate can be increased, the number of processing steps and the number of times of heating can be significantly reduced, and a single rolling machine can perform various processing operations that are different from each other. In addition, the bar material is passed through the valley groove once at a time for processing.

FIG. 3 is a partial sectional view showing another example of the grooving rolls 7a, 7b.

In this figure, the rolling roll 7a has an elliptical groove 31.3.
3a, 33b, 35 and triangular grooves 32.degree. 34 are arranged alternately in the length direction of the roll. Furthermore, semicircular grooves 36, 37, and 38 are arranged near the right end of the illustrated roll.

One of the continuous grooves 33a and 33b having the same shape is basically a groove provided as a backup for a groove that is severely worn out.

These grooves have different amounts of wear depending on the type of groove, so
The necessary number of grooves may be arranged according to the amount of wear, and the amount of wear may be averaged.

Further, the bar is processed by passing it through the grooves once, and the required number of grooves is determined based on data, taking into account the material of the rolling rolls, the importance of the grooves, etc.

Furthermore, two or more finishing semicircular grooves 36 and 37 having relief angles of up to 90'' are provided at each fixed angle.

Depending on the finished product, the finishing semicircular grooves 36 and 37 allow stable processing from raw materials to finishing, and it is possible to finish products that are closer to a perfect circle.

Also, there is no need to adjust the distance between the rolls during work.

FIG. 4 is a partial sectional view showing yet another example of the rolling roll of the processing apparatus shown in FIG.

In this figure, the rolling roll 7a- is provided with more than 10 types of grooves, which are divided finely depending on the size of the grooves. And elliptical grooves 41a, 41b.

43, triangular grooves 42a, 42b, 42c, 44a.

The degree and manner of abrasion of the respective grooves 44b, 44c, 44d, etc. differ depending on the degree of machining and the degree of contact with the material. In addition, the relief angle of the semicircular groove (not shown) depends on the type of rolled material, processing temperature, processing speed, degree of groove wear, etc.
Appropriate finishing grooves can be selected. Furthermore, with this rolling roll, even if the processing conditions change slightly,
By selecting the finishing groove, it is possible to process with the same rolling roll. In addition, although the effect of groove wear is particularly large, by selecting finished grooves, abnormalities can be prevented and
A product that is closer to a perfect circle can be obtained. Roll roll 7
The rolling roll 7b- facing the rolling roll a- is the rolling roll 7a″
A similar groove is provided. Conventional semicircular grooves are machined many times with the same groove, and no special consideration is taken to gradually improve the roundness.

As with the rolling roll described in FIG. 3, stable operation for a long period of time (six months to one year) is possible without special polishing.

This is because the machining rate is greater than the semicircular grooves of conventional rolling rolls, so a large number of grooves can be provided in succession.

In particular, the cost of polishing is very high compared to the unit purchase price of the roll, and the cost reduction effect is also significant.

Through various rolling experiments, the optimal number of grooves has been selected for each groove size according to the characteristics of each high-melting point metal.

Therefore, this rolling roll has a total of 20 to 30 grooves.

Even when processing molybdenum materials, the number of grooves varies depending on the type and location of the grooves.

Table 1 shows an example of the types of grooves provided on such rolling rolls.

Figure 5 of Table 1 shows an inlet guide 3. which is provided close to the rolling roll 7 for the purpose of guiding and straightening the bar introduced into the rolling roll. It is a figure which shows guide members, such as exit side guide 8.

In FIG. 5, the groove rolling roll 7a has 20 to 30
Although grooves 51a, 51b, . . . are provided in several places, a minimum of about 10 guides 3aψ3b, .

The material of this guide is 5841.3, which is a very thin film material.
45C, etc., and the positions of the guides 3a, 3b, etc. are moved along the length direction 53 of the rolling roll 7 according to the degree of wear of the respective grooves 518-51b. , there will be no problem at all. The operator can easily create the final product by simply inserting the bars in order.

The front portions of these guides 3a, 3b, . . . are 5 to 10 times wider than the guide width on the side processed by the groove rolling roll.

Therefore, the operator can insert the material into the guides 3a and 3b very easily.

Note that 54 in the figure is an arrow indicating the insertion direction.

FIG. 6 is a perspective view showing the assembly of the guide of FIG. 5. Since the other guides have similar structures, the guide 3a will be explained. In FIG. 6, the guide 3a is formed with a groove 61 passing through the center from the top, and an end point 61 of the groove in the center.
A taper 62 with a rectangular cross-section is formed such that the cross-sectional area gradually increases as it approaches this side from b.

Moreover, it is divided into left and right parts symmetrically with this groove 61 as a center line, and is assembled by fastening bolts 66 and 67.

The bar is inserted from the front using such a guide 3a, but if the guide groove 61 wears out, machining becomes unstable. Therefore, the guide 3a is divided periodically as necessary, and JIS DFME-B, DF is applied to each worn part.
A material whose surface hardens, such as 2B-B, is welded to form a build-up 65 for modification. Repairs can be easily made in this way, and the main body of the guide 3a can be used semi-permanently.

A guide using an expensive hardened material different from that of this embodiment has a longer lifespan, but troubles such as cracking and repairs are almost impossible.

Using the apparatus according to the embodiment of the present invention, a high-melting point metal, for example, about 4 kg with a diameter of 30 mm can be prepared.

When a bar-shaped molybdenum material with a length of 600 mm is hot rolled, it can be processed continuously and a material with less cracking and bending can be obtained.

Furthermore, when using the refractory metal bar processing apparatus according to the embodiment of the present invention, the shape, arrangement, and number of grooves can be selected depending on the purpose, and the simple configuration prevents equipment trouble. Repairs of parts due to wear can be completed easily and in a short time, and stable production can be performed according to the production plan.

Furthermore, it is possible to process materials other than molybdenum that are difficult to process, such as tungsten.

[Effects of the Invention] As explained above, the present invention provides a rolling roll for processing high-melting point metal bars, which can greatly improve productivity, enable planned production and shorten delivery times, and the rolling roll. A guide member for feeding a bar into a groove and a method for processing a high melting point metal using this rolling roll are obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the configuration of a refractory metal bar processing apparatus according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing an example of a rolling roll of the processing apparatus shown in FIG. Figure 3 is a sectional view showing a conventional rolling roll for general metals, and Figure 4 is a cross-sectional view of a conventional rolling roll for general metals.
A partial cross-sectional view showing another example of the rolling roll of the processing device shown in FIG.
FIG. 5 is a diagram showing a guide provided close to the rolling roll for the purpose of guiding and straightening the bar introduced into the rolling roll; FIG. 6 is a perspective view showing the assembly of the guide in FIG. 5;
FIG. 7 is a diagram showing the processing steps for a bar made of high melting point metal such as tungsten and molybdenum. In the figure, 1 is a heating furnace, 2 is a bar, 2- is a processed bar,
2' is a raised bar, 3 is an entrance side guide, 7 is a rolling roll part, 7a, 7b are rolling rolls, 8 is an exit side guide, 9
is a rear table, 11 is a position detection sensor, 5 is a dust hood, 6 is a side dust collection hood, 10 is a dustproof hood, 12.1
2- is the upper local hood, 21.23.25 is the oval groove, 2
2゜24 is a triangular groove, 26 is a semicircular groove for finishing, 31゜3
3a, 33b are elliptical grooves, 32.34 is triangular groove, 36.3
7.38 is a semicircular groove, 41a, 41b. 43 is an elliptical groove, 42a, 42b, 42c, 44a. 44b, 44c, 44d are triangular grooves, 51a, 51b...
- is a groove, 53 is an arrow indicating the length direction, 54 is an arrow indicating the insertion direction, 61 is a guide groove, 62 is a tapered surface, 65 is a build-up, 66, 67 is a bolt, 71 is a heating furnace, 72 is a rod wood,
73 is a rolling roll part, 75 is a bar reaching the rear, 74 is a rear table, 76 is a heating furnace, and 78 is a large swaging machine.

Claims (1)

[Scope of Claims] 1. A pair of rolling rolls that are provided facing each other to process a heated bar of high-melting point metal so that its diameter is narrowed, and that have grooves on their outer circumferential surfaces; 1. A rolling roll for processing a bar of high-melting point metal, characterized by having an elliptical and triangular shape. 2. A processing method using the rolling roll for processing high melting point metal bars according to claim 1, wherein rolling is performed by selectively feeding each bar into the elliptical triangular groove. A method for processing high melting point metal bars. 3. The groove provided in the rolling roll for processing the refractory metal bar according to claim 1 is provided with a guide portion for supplying the refractory metal bar material, and the guide portion guides the rod material. What is claimed is: 1. A guide member for machining a bar of a high melting point metal, characterized in that it has a guide groove and is movable in the length direction of the rolling roll.