JP2002263727A - Apparatus and method for manufacturing track rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing a track rail for linear guides, by which the buckling of a base stock to be worked is prevented even when the work is performed at a large reduction of area by working and the work can be started without causing any buckling. SOLUTION: In the manufacturing apparatus 1 for track rails using an extruding/drawing device which has at least a drawing device 2, an extruder 3 and a working die 4 which is installed between them and with which the base stock 6 to be worked is worked into a prescribed cross-sectional shape, by providing a guide member 16 between the extruder 3 and the working die 4, the buckling on the way of manufacture is prevented and, by arranging a guide die in an adjacent relation on the inlet side of the working die 4, the buckling at the start of manufacture is prevented. At this time, the base stock 6 to be worked which is extruded from the extruder 3 is held without offset to the working die 4 with the guide member 16. Moreover, the internal shapes of the guide member 16 and the guide die are made into the same shape as the cross-sectional shape of the base stock 6 to be worked which is extruded from the extruder 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track rail manufacturing apparatus and a track rail manufacturing method. More specifically, the present invention does not cause buckling or buckling even when working at a large processing area reduction rate. TECHNICAL FIELD The present invention relates to a track rail manufacturing apparatus and a track rail manufacturing method for a linear guide device that can start machining without any problems.

[0002]

2. Description of the Related Art FIG. 15 shows an example of a linear guide device incorporated in a machine tool or the like to guide a table or the like for supporting a workpiece. This linear guide device includes a track rail 12 having a rolling element rolling surface 121a formed in a longitudinal direction.
1 and the track rails 12 via a number of rolling elements 122.
1 and a slide member 123 having an infinite circulation path for the rolling elements 122 therein.

[0003] Such a track rail 121 is usually manufactured by a drawing process in which a processing die having a predetermined hole shape is drawn forward of the processing die. Since the material of the track rail is usually a high-strength steel wire, the manufacturing of the track rail by drawing is performed by repeating annealing and drawing so as to gradually change the shape of the track rail. . The processing die used at this time has a processing area reduction rate of about 10 to 20% in consideration of the workability at the time of drawing and the disconnection frequency.

In such a conventional manufacturing method, a plurality of drawing processes are required. Therefore, once disconnection occurs, the productivity is significantly reduced. There is a problem that skill is required for the production and a problem that it is difficult to form a complicated shape.

[0005] By the way, as a solution to such a problem in the drawing process, there is a working die 4.
There is known an extrusion drawing method and apparatus in which a drawing device 2 and an extruding device 3 are arranged before and after (see FIG. 12). This extruder can be used to process high-strength materials that are difficult to process only by drawing, to process difficult-to-work materials with poor plastic workability, to manufacture products with complex shapes, or to use composite materials. It is preferably used when manufacturing products using Specifically, they are used for continuous production of steel wires, production of deformed products of non-ferrous metals such as aluminum alloys, production of products using difficult-to-work materials such as titanium alloys, and the like. Japanese Patent Application Laid-Open No. 3-275213 discloses an example in which such an extrusion drawing apparatus is used for processing a steel wire.

[0006]

SUMMARY OF THE INVENTION The present inventors have used the above-described extrusion drawing apparatus, have used a round steel material having a circular cross section as the material to be processed 6, and have performed a single plastic working with a large working reduction rate. Thus, an attempt was made to manufacture a track rail 7 requiring a complicated shape and high dimensional accuracy as shown in FIG.

However, when the track rail 7 is manufactured using a conventional extrusion pulling apparatus, FIG.
As shown in FIG. 4 (c), there is a first problem that the workpiece 6 is buckled between the extrusion device 2 and the processing die 4 during the production, and the production is often interrupted. .

The inventors of the present invention have conducted intensive studies to solve the first problem and obtained the following findings. In other words, the main factors of buckling that occur during manufacturing are (a)
That the core of the workpiece 6 extruded from the extrusion device 3 and the core of the processing die hole are misaligned; (b) the workpiece 6 is not pressed straight against the processing die 4 due to the inclination of the processing die 4; C) Teeth (workpiece material 6)
A nail that grabs ) Uses the extruding device 3 for grasping and extruding the workpiece 6, the teeth of the workpiece 6 slightly deform the workpiece 6, and (d) the workpiece 6 is slightly fuzzy. , Etc. It has been found that such a factor inevitably causes bending in the space between the processing die 4 and the extruding device 3 and buckling occurs in the workpiece 6 during manufacturing. In particular, since a high-strength steel material that requires a large processing stress is used for manufacturing the track rail 7, if the track rail 7 is manufactured by a single plastic working with a large reduction in processing area, such a seat is required. There is a situation in which bending easily occurs, and this has been an extremely large problem in manufacturing.

Further, at the time of start, a knitting end portion 113 which changes from the workpiece 6 to a knitting portion 112 is provided.
However, there is a second problem that buckling occurs at the entrance of the processing die 4 because it cannot pass through the processing die 4 (see FIG. 14B), and the production cannot be started smoothly.

The present inventors have conducted intensive studies to solve the second problem and obtained the following findings. That is, as shown in FIG. 14B, buckling at the mouth end portion 113 at the entrance of the processing die 4 is caused by the fact that the mouth end portion 113 has the processing die hole 106 shown in FIG.
Of the processing die hole 106 in the left-right direction than the deformation stress on the portions 104, 105 having a large width in the vertical direction.
It has been found that this is based on a large deformation stress with respect to 2, 103. It has been found that by such a phenomenon, the workpiece 6 is deformed so as to escape in the vertical direction of the processing die hole 106 having a smaller deformation stress, and buckling occurs.

The present invention has been made on the basis of the above knowledge in order to solve the above-mentioned problems, and does not cause buckling of a material to be processed even when processing is performed at a large processing area reduction rate. An object of the present invention is to provide a track rail manufacturing apparatus and a track rail manufacturing method for a linear guide device that can start machining without causing buckling.

[0012]

The invention of an apparatus for manufacturing a track rail according to claim 1 has been made to solve the first problem. That is, a drawing device, an extrusion device, and a track rail manufacturing device using an extrusion drawing device including a processing die provided between them and a processing die for processing a material to be processed into a predetermined cross-sectional shape, A guide member is provided between the extrusion device and the processing die to hold the workpiece extruded from the extrusion device without misalignment with respect to the processing die, and an inner surface shape of the guide member is the extrusion device. It is characterized in that it has the same shape as the cross-sectional shape of the material to be processed extruded from.

According to the present invention, a guide member is provided between the extrusion device and the processing die so as to hold the material to be processed without misalignment with respect to the processing die. Since the shape of the cross section of the extruded workpiece is the same as that of the extruded workpiece, the workpiece can be held at an appropriate position for preventing buckling of the workpiece without blurring. Therefore, the material to be processed can be held without misalignment with respect to the processing die, so that the occurrence of buckling when manufacturing the track rail can be suppressed.
According to this track rail manufacturing apparatus, a single plastic working with a large reduction in processing area can be performed without causing buckling during the manufacturing, so that the track rail can be manufactured very efficiently. Can be.

The invention of a track rail manufacturing apparatus according to a second aspect has been made to solve the second problem.
That is, a drawing device, an extrusion device, and a track rail manufacturing device using an extrusion drawing device including a processing die provided between them and a processing die for processing a material to be processed into a predetermined cross-sectional shape, On the inlet side of the processing die, a guide die adjacent to the processing die is provided, and the inner surface shape of the guide die is substantially the same as the cross-sectional shape of the workpiece extruded from the extrusion device. Has features.

According to the present invention, since the guide die provided adjacent to the processing die inlet side has an inner surface shape substantially the same as the cross-sectional shape of the material to be processed extruded from the extruder, the guide die is particularly started. At times, the material to be processed can be prevented from deforming and escaping in any direction having a smaller deformation stress. As a result, it is possible to prevent the material to be processed from buckling at the entrance of the processing die due to the fact that the end of the mouth cannot pass through the processing die. Therefore, according to this track rail manufacturing apparatus, plastic working with a large processing area reduction rate
Since it can be started without buckling, the track rail can be manufactured very efficiently.

According to a third aspect of the present invention, in the track rail manufacturing apparatus according to the second aspect, the processing die and the guide die are integrally fixed via a spacer.

According to the present invention, since the processing die and the guide die are integrally fixed via the spacer, they can be used as one buckling prevention die, and the mouth end portion is long. Even if formed,
Buckling can be suppressed. As a result, it is possible to stably produce the track rail without considering the positional deviation between the processing die and the guide die.

The invention according to claim 4 is characterized in that the first problem and the second problem are solved.
It was made to solve the problem at the same time. That is, in the track rail manufacturing apparatus according to claim 2 or 3, the workpiece to be extruded from the extrusion device is misaligned between the extrusion device and the guide die with respect to the processing die. And a guide member for holding the guide member is provided, and an inner surface shape of the guide member is the same as a cross-sectional shape of the workpiece to be extruded from the extrusion device.

According to the present invention, the guide member for holding the workpiece without misalignment with respect to the processing die is provided between the extruding device and the guide die. Since the workpiece is provided with the same inner surface shape, the workpiece can be held at an appropriate position for preventing buckling of the workpiece. Therefore, occurrence of buckling during the manufacture of the track rail can be suppressed. Therefore, according to this track rail manufacturing apparatus,
Since it is possible to start plastic working with a large reduction in processing area without buckling and to maintain the manufacturing without buckling, it is possible to manufacture track rails very efficiently. can do.

A fifth aspect of the invention of a method for manufacturing a track rail is made to solve the first problem.
That is, a method of manufacturing a track rail for manufacturing a track rail having a predetermined shape by extruding and drawing a material to be processed by an extruding means and a pulling means provided before and after a processing die, and extruded by the extruding means. The workpiece to be processed is provided between the extrusion means and the processing die, and the inner surface of the workpiece is guided by the guide member having the same shape as the cross-sectional shape of the workpiece to be extruded from the extrusion device. It is characterized in that it is extruded and drawn while being held without misalignment.

According to the present invention, the material to be processed is firstly
The guide member provided between the pushing means and the processing die holds the processing die without misalignment. The material to be processed is guided to the processing die without line deviation or misalignment by the action of the guide member, and is extruded and drawn. Therefore, since the material to be processed is extruded and drawn while being kept at an appropriate position where buckling does not occur, buckling during manufacturing can be prevented as much as possible, and the track rail can be manufactured extremely efficiently. it can.

The invention of a method of manufacturing a track rail according to a sixth aspect has been made to solve the second problem.
That is, a method of manufacturing a track rail for manufacturing a track rail of a predetermined shape by extruding and drawing a material to be processed by an extruding means and a drawing means provided before and after a processing die, wherein the material to be processed is It is provided adjacent to the inlet side of the processing die, and the inner surface shape is extruded and drawn while being guided by a guide die having substantially the same cross-sectional shape as the material to be processed extruded from the extrusion device. Having.

According to the present invention, the material to be processed is firstly
It is provided adjacent to the inlet side of the processing die and its inner surface is guided to the processing die while being guided by a guide die having substantially the same cross-sectional shape as the material to be processed extruded from the extruder. The work material guided to the working die is extruded and drawn while being prevented from being deformed and escaped in an arbitrary direction having a smaller deformation stress by the guide die. For this reason, it is possible to start the production of the track rail while maintaining the material to be processed in a state in which buckling at the entrance of the processing die is prevented. Therefore, according to this method of manufacturing a track rail, plastic working at a large processing area reduction rate can be started without causing buckling, so that the track rail can be manufactured very efficiently. .

The invention according to claim 7 is characterized in that the first problem and the second problem are solved.
It was made to solve the problem at the same time. That is, in the method for manufacturing a track rail according to claim 6,
The work material extruded by the extruding means is provided between the extruding means and the guide die, and has a guide member whose inner surface has the same shape as the cross-sectional shape of the work material extruded from the extruder. Thus, it is characterized in that it is extruded and drawn while being held without misalignment with the processing die.

According to the present invention, the workpiece is provided by a guide member provided between the extruding means and the guide die and having an inner surface having the same shape as the cross-sectional shape of the workpiece extruded from the extrusion device. , And is held without misalignment with the processing die. The material to be processed is guided to the processing die without line deviation or misalignment by the action of the guide member, and is extruded and drawn. As a result, the workpiece is extruded and drawn while being kept at an appropriate position where buckling does not occur, so that buckling during manufacturing can be prevented as much as possible. Therefore, according to this method for manufacturing a track rail, plastic working with a large reduction in processing area can be started without causing buckling, and the manufacturing can be maintained without causing buckling. Therefore, the track rail can be manufactured extremely efficiently.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A track rail manufacturing apparatus and a track rail manufacturing method according to the present invention will be described with reference to the drawings.

[0027] The track rail 7 manufacturing apparatus 1, 1 'of the present invention.
As shown in FIGS. 1 and 2, an extrusion device having at least a drawing device 2, an extruding device 3, and a processing die 4 provided between them and processing a workpiece 6 into a predetermined cross-sectional shape. It is a drawing device. In the track rail manufacturing apparatuses 1 and 1 'of the present invention, in the track rail manufacturing apparatus 1 (see FIG. 1) of the first embodiment which has been made to solve the first problem, an extruding apparatus. It is characterized in that it has a guide member 16 provided between the machining die 3 and the processing die 4, and a track rail manufacturing apparatus 1 ′ according to a second mode (see FIG. 2) which is designed to solve the second problem described above. ) Is characterized by having a guide die 5 provided adjacent to the entrance side of the processing die 4.

First, the track rail manufacturing apparatus 1 of the present invention,
An extrusion pulling-out device constituting a main part of 1 'will be described.

The extrusion pulling-out device is a device that pulls out the workpiece 6 while pressing it against the processing die 4.
A track rail 7 having a complicated sectional shape as shown in FIG. 10 can be preferably manufactured. This device can press the workpiece 6 against the processing die 4 by the large extrusion pressure of the extrusion device 3. Therefore, it is possible to perform processing with a large processing area reduction rate, which is difficult to manufacture due to disconnection only by the pulling tension of the pulling device 2. In addition, since a large extrusion pressure is applied, even when the processing die has a complicated shape, the workpiece 6 can be flowed to every corner of the processing die 4, and a complicated shape can be obtained.

The drawing device 2 is arranged in front of the working die 4. With this device, the track rail 7 that has been processed into a predetermined shape can be pulled out through the processing die 4. In addition, it is preferable that it is the extraction apparatus 2 which can be continuously extracted.

The drawing device 2 shown in FIGS. 1 and 2 is a drawing device capable of continuous drawing. The pulling-out device 2 is a caterpillar-type endless track type, and teeth 9 (claws) for grasping and pulling out the track rail 7 are provided on the outer periphery of the track. According to the drawing device 2, the caterpillar can be operated in an endless track by the sprocket 10, and the track rail 7 can be continuously drawn. The pulling tension is applied by pulling out the teeth 9 sandwiching the track rail 7 at a predetermined speed while maintaining the pressure at an arbitrary pressure adjusted by hydraulic pressure or the like. The shape and material of the teeth 9 that grip the track rail 7 are preferably shapes and materials that can hold the track rail 7 under pressure without deforming or scratching it.

Further, a draw bench type drawing device may be used. Since a general draw bench cannot be continuously machined by simply pulling out a limited length with a chuck, it is preferable to employ a chucking mechanism that enables continuous drawing.

The pulling device 2 is controlled so as to pull out the track rail 7 processed into a predetermined shape at a predetermined speed. The drawing speed is linked to the production amount of the track rail 7, and can be arbitrarily set according to the processing reduction ratio, the drawing tension, the extrusion pressure, the shape of the processing die, and the like.

The extruding device 3 is a device that is disposed behind the processing die 4 and presses the workpiece 6 against the processing die 4. By using the extruding device 3 in cooperation with the drawing device 2, plastic working can be performed with a large reduction in working area. Furthermore, disconnection based on a large drawing tension, which is likely to occur only by drawing, can be eliminated.

The extruding device 3 is preferably a device capable of continuously extruding, like the drawing device 2 described above. For example, a caterpillar type endless track type as shown in FIGS. 1 and 2 may be used. it can.

Crawler track type extrusion device 3
In the figure, teeth 9 (claws) for grasping and extruding the workpiece 6 are provided on the outer periphery of the caterpillar. According to the extruder 3, the caterpillar is connected to the sprocket 1
With 0, the workpiece 6 can be continuously extruded by the endless track operation. The extrusion stress is applied so that the teeth 9 sandwiching the workpiece 6 are kept at an arbitrary pressure adjusted by hydraulic pressure or the like while maintaining a predetermined pressure. It is preferable that the shape and the material of the teeth 9 that grip the workpiece 6 be a shape and a material that can hold the workpiece 6 under pressure without deforming or scratching it. The workpiece 6 is
Normally, since round steel is used, the teeth 9 having an arc-shaped groove, a V-shaped groove, a trapezoidal groove, or other shapes can be obtained.

The extruder 3 converts the material 6 to be processed so that the material 6 can be extruded and drawn at a predetermined processing reduction rate while following a drawing speed controlled to a predetermined value.
It is controlled so as to press against the processing die 4 with a predetermined extrusion stress.

The working die 4 is provided between the drawing device 2 and the extruding device 3 as shown in FIGS.
In the manufacturing apparatus 1 of the first embodiment, the processing die 4 is integrally combined with a guide member 16 to be described later to constitute a buckling prevention device 20 (see FIGS. 1, 4 and 7), and the second.
In the manufacturing apparatus 1 ′ of the embodiment, a buckling prevention die 15 is integrally fixed with a guide die 5 described later (see FIGS. 2, 4, and 8). The workpiece 6 is processed into a track rail 7 having a predetermined cross-sectional shape by passing through an approach portion 17 and a bearing portion 18 (a processing die hole) of the processing die 4.

The working die 4 is made of a WC-Co cemented carbide generally used for drawing a steel material. The shape of the processing die 4 is preferably the same as the dimension of the track rail 7 as a product, but can be adjusted in anticipation of a dimensional change during processing. In the present invention, since the track rail 7 having a complicated cross-sectional shape as shown in FIG. 10 is manufactured, it is possible to adjust the hole size of the processing die 4 by measuring the design size and the processed size. preferable.

When the workpiece 6 is processed by the processing die 4, a lubricant is used. The lubricant can enhance the lubrication between the workpiece 6 and the processing die 4 and suppress the occurrence of seizure and large frictional resistance. As the lubricant, a commercially available lubricant conventionally used can be preferably used and is not particularly limited. The lubricant is supplied to the entrance side of the processing die 4, and specifically, can be supplied from the round hole 23 of the integrated buckling prevention device 20 shown in FIG.

Next, the guide member 16 will be described in detail.

The guide member 16 is a characteristic structure for solving the first problem. In the manufacturing apparatus 1 of the first embodiment and the manufacturing apparatus 1 'of the second embodiment, the extruder 3 and the processing die 4 are used. It is provided between. In particular, in the manufacturing apparatus 1 ′ of the second embodiment, it is provided between the extruding apparatus 3 and the buckling prevention die 15 mainly composed of the processing die 4 and the guide die 5.

The guide member 16 has a function of holding the workpiece 6 extruded from the extrusion device 3 with respect to the processing die 4 without misalignment. Guide member 16
Is provided so that the axis of the workpiece 6 coincides with the axis of the processing die hole, and holds the workpiece 6 at an appropriate position where buckling does not occur. The guide member 16 provided in this manner can supply the workpiece 6 to be processed continuously to the processing die 4 while keeping the workpiece 6 aligned with the axis of the processing die hole and preventing line and core deviation. . The guide member 16 is provided with the workpiece 6 extruded from the extrusion device 3.
The shape and the mode are not particularly limited as long as it has a function of holding the workpiece with respect to the processing die 4 without misalignment.

Shaft core (the same meaning as core)
Is the center or the center of gravity of the workpiece 6 and also the center or the center of gravity of the processing die hole. For example, when the material 6 to be processed is a round steel material having a circular cross section, it is usually the center of the circular cross section (the same as the center of gravity). Further, when the shape of the processing die hole is as shown in FIG. 10 described later, it is usually the center of gravity.
Note that, depending on the shape of the processing die hole, the center of gravity or the center of the processing material 6 and / or the processing die hole does not necessarily match the axis of the processing material 6 and / or the processing die hole where buckling does not occur. Sometimes not. In such a case, an experimental value that does not cause buckling is used as the axis, and the axis of the workpiece 6 and the axis of the processing die hole are made to match.

It is preferable that the guide member 16 has the same inner surface shape as viewed from the moving direction of the workpiece 6, which is the same as the cross-sectional shape of the workpiece 6 extruded from the extrusion device 3. Since the workpiece 6 extruded from the extruder 3 is firmly held by the guide member 16 having such an inner surface shape, the workpiece 6 after passing through the guide member 16 may be displaced in line or in the center. There is no. Therefore, the workpiece 6 is guided to the processing die 4 without misalignment,
It is extruded without buckling. In addition, since the normal workpiece 6 is a round steel, the inner surface shape of the guide member 16 as viewed from the traveling direction of the workpiece 6 is preferably a circle having the same diameter as the round steel.

FIG. 3 is a sectional view showing an example of the guide member 16 when a round steel is used as the material 6 to be processed. FIG.
The guide member 16 shown in (a) is a carbide working die having a hole shape having the same diameter as the cross-sectional shape of the round steel extruded from the extrusion device 3. The diameter of the processing die at this time is preferably in the range of + 2% to -3% with respect to the diameter of the round steel. By setting the hole diameter within this range, the round steel as the workpiece 6 can be held more evenly with respect to the processing die 4. Further, the guide member 16 may be formed in a shape shown in FIG. 3B having a flange portion that can be screwed.

It is preferable that such a guide member 16 be made of a WC-Co-based cemented carbide, similarly to the processing die 4 described above. In addition, it is preferable that the length of the bearing portion 18 of the guide member 16 is set to, for example, about 5 mm to reduce the area in contact with the workpiece 6 and that the bearing portion 18 has an R shape. Since the guide member 16 having the bearing portion 18 having such a shape has a small resistance between the workpiece 6 and the contacting workpiece 6, the workpiece 6 can be more preferably guided to the processing die 4.

Further, as shown in FIG. 9, the guide member 16 may be constituted by a plurality of roller working dies. The roller processing dies can be used by combining various commonly used roller processing dies, cassette roller processing dies 19 and the like. In this case, the inner surface shape formed by each roller processing die viewed from the traveling direction of the workpiece 6 is
The workpiece 6 extruded from the extrusion device 3 has the same cross-sectional shape as the workpiece 6.

Further, a slip guide can be used as the guide member 16 in addition to the above-mentioned processing die and roller processing die. The slip guide is not particularly limited, but is made of a material that is not easily worn, and holds the work material 6 without centering.
What is necessary is just to be able to be led to.

The guide member 16 is required to have high rigidity and is preferably fixed firmly so as not to bend, tilt or rattle. If this is insufficient, the axis of the processing die hole and the axis of the workpiece 6 cannot be matched, so that the occurrence of buckling may not be sufficiently suppressed. Guide member 16
As a method of fixing rigidly, as shown in FIG.
The guide member 16 is provided with a number of bolt holes 25, and FIG.
It is preferable to fix directly to the fixing flange 22 shown in FIG.

In order to prevent eccentricity between the processing die 4 and the workpiece 6 to prevent buckling, as shown in FIG. 4, the processing die 4 and the guide member 16 are integrally combined to prevent buckling. It is preferable to use the device 20 or the buckling prevention device 20 in which the guide member 16 and the buckling prevention die 15 having the processing die 4 and the guide die 5 described later are integrally combined. Such a buckling prevention device 20 includes a processing die 4 or a buckling prevention die 15 and a die holder 21 for mounting the processing die 4 or the buckling prevention die 15.
And a fixing flange 22 for fixing the processing die 4 or the buckling prevention die 15 and a guide member 16 fixed to the fixing flange 22. According to the buckling prevention device 20, the processing die 4 or the buckling prevention die 15 and the guide member 16 are fixed by fixing means such as bolting. The workpiece is manufactured such that the axis of the processing die hole coincides with the axis of the workpiece 6 guided by the guide member 16. Therefore, since the axis of the workpiece 6 that has passed through the guide member 16 always coincides with the axis of the processing die hole, buckling does not occur.
In addition, since it is rigidly and firmly fixed by many bolts, the track rail 7 can be stably manufactured without causing buckling even when it is continuously processed. Such a strong fixing method by bolting does not cause backlash unlike the conventional key connection, so that the occurrence of buckling can be further suppressed.

As shown in FIGS. 3 (a), 3 (b) and 4, the guide member 16 preferably has a tapered portion 24 at the tip of the pushing device 3 side. Such a tapered portion 24 can minimize the distance to the extrusion device 3 while avoiding contact with the caterpillar shown in FIGS. 1 and 2. As a result, deviation of the axis of the workpiece 6 and deviation of the line between the exit portion of the extrusion device 3 and the guide member 16 can be eliminated, so that the occurrence of buckling can be further suppressed.

By the action of the guide member 16, the occurrence of buckling of the workpiece 6 which occurs when the track rail 7 is manufactured can be suppressed. Such suppression of buckling enables an extrusion drawing process based on a higher drawing speed or a larger extrusion stress than before. And even if continuous processing is performed with a larger extrusion stress, the buckling of the workpiece 6 does not occur. That is, the load (buckling load) until buckling occurs can be improved, so that processing can be performed with a larger processing area reduction rate. As a result, the workpiece 6 can be continuously and efficiently processed at a high processing reduction rate of 40 to 70%.

Next, the guide die 5 will be described in detail.

The guide die 5 is a characteristic structure for solving the second problem. In the manufacturing apparatus 1 ′ of the second embodiment, the guide die 5 is located on the entrance side of the processing die 4 so as to be adjacent to the processing die 4. Provided.

At the start of the production of the track rail 7, the guide die 5 is provided with an optional material having a smaller deformation stress when the knot end portion 113 reaches the processing die 4 and the deformation resistance increases. It acts to prevent it from deforming in the direction (vertical direction in FIG. 13).
By such an operation, it is possible to prevent the workpiece 6 from being buckled at the entrance of the processing die because the lip end portion 113 cannot pass through the processing die 4. In addition, this guidance die 5
As described above, as long as it is provided on the inlet side of the processing die 4 so as to be adjacent to the processing die 4 and exerts the above-described effects, its shape and installation form are particularly limited. is not.

The guide die 5 is preferably made of a WC-Co cemented carbide like the processing die 4 and the guide member 16 described above. Guide die 5
Preferably, the length L of the bearing portion 18 is set to, for example, about 5 mm to reduce the area in contact with the workpiece 6. Further, it is preferable that the shape of the bearing portion 18 be an R shape. The guide die 5 having the bearing portion 18 having such a shape reduces the resistance between the guide die 5 and the workpiece 6 that comes into contact with the guide die 5, so that the workpiece 6 can be more preferably guided to the processing die 4.

The inner shape of the guide die 5 is preferably substantially the same as the cross-sectional shape of the workpiece 6 extruded from the extrusion device 3. The guide die 5 having such an inner surface shape acts to prevent the workpiece 6 from deforming and escaping in an arbitrary direction having a smaller deformation stress. In addition, it is possible to prevent the workpiece 6 from buckling at the machining die entrance because the mouth end 113 cannot pass through the machining die 4.

At this time, the guide dies 5 have substantially the same shape.
And the shape of the workpiece 6, the shape of the workpiece 6 is slightly larger than the shape of the guide die 5, or a part of the shape of the guide die 5 is The other part is a case where the shape of the workpiece 6 is slightly larger than the shape. The case where the shape of the workpiece 6 is slightly larger generally refers to a case where the shape corresponds to a range of 0 to + 3% with respect to the guide die 5, but the degree is also related to the shape of the processing die 4. So
It is not particularly limited to this value.

The shape of the guide die 5 and the workpiece 6
In this case, the workpiece 6 comes into contact with the guide dies 5, so that a slight contact resistance is generated, but no wobbling or rattling occurs.

FIG. 6 is a front view showing an example of the processing die 4 and the guide die 5 used. The shape of the inner surface of the guide die 5 shown in FIG. 6 is the same as the shape of the workpiece 6 made of a round steel material in the region A and the region B. The shape is slightly larger.

At this time, in regions A and B in the vertical direction where the shape of the guide die 5 and the shape of the workpiece 6 match, a contact resistance is generated between the workpiece 6 and the guide die 5 and wobble. There is no rattling. Therefore, when the workpiece 6 is processed by the processing die 4 shown in FIG. 6A, it is possible to prevent the workpiece 6 from being deformed in the vertical direction where the deformation stress is smaller and to escape. on the other hand,
In the left and right regions C and D in which the shape of the guide die 5 is slightly larger than the shape of the workpiece 6, there is no large contact resistance between the workpiece 6 and the guide die 5. It may fluctuate slightly in a range where there is no problem. However, when the workpiece 6 is processed by the processing die 4 shown in FIG.
Since there is no escape due to deformation in the left-right direction where deformation stress is large, by providing such areas (C, D) having small contact resistance, it is possible to prevent an increase in contact resistance between the guide die 5 and the workpiece 6. .

Therefore, it is preferable that the inner surface shape of the guide die 5 is arbitrarily designed according to the cross-sectional shape of the workpiece 6 in consideration of these points.

The guide die 5 can be manufactured as a die separate from the processing die 4, but it is preferable to manufacture the guide die 5 integrally with the processing die 4. Therefore, when the processing die 4 and the guide die 5 are separately manufactured and used, it is preferable to arrange them adjacent to each other. Further, it is preferable that the processing die 4 and the guide die 5 are fixed so as not to cause a positional shift. Such fixing can be performed by screwing or the like, but may be performed by a method such as fitting or shrink fitting.

In particular, in the present invention, as shown in FIG. 5, it is preferable that the processing die 4 and the guide die 5 are integrally formed via the spacer 13. By providing the spacer, even when the lip end portion 113 of the workpiece 6 is formed long, the workpiece 6 can be reliably brought into contact with the guide die 6, so that the occurrence of buckling is minimized. can do. As a result, the track rail 7 can be stably produced without considering the positional deviation between the processing die 4 and the guide die 5.

When the guide die 5 and the processing die 4 are integrally fixed irrespective of whether or not the spacer 13 is interposed therebetween, they can be used as one buckling prevention die 15. The track rail 7 can be stably produced without considering the positional deviation between the processing die 4 and the guide die 5. At this time, the processing die 4, the guide die 5, the spacer 13, and the like constituting the buckling prevention die 15 are joined by a fixing method such as screwing or shrink fitting.

When starting the manufacture of the track rail 7 using the buckling prevention die 15 having the above-described guide die 5,
First, the workpiece 6 made of a round steel material is subjected to a knotting process in a form similar to the form shown in FIG. The kissing process is
This is a process of narrowing the tip of the workpiece 6 so that the workpiece 6 can easily pass through the hole of the processing die 4. In the present invention, it is preferable to perform the knurling process so that the length is about half the length of the drawing device 2. A swaging machine or the like is usually used for the knurling process, and the knives are processed into a substantially circular shape. Next, the pulling-out of the lip 112 by the pulling-out device 2 is started, and the extrusion pulling-out process of the workpiece 6 is started, and the track rail 7 is manufactured. At this time,
When the lip end portion 113 reaches the processing die 4, the deformation stress of the workpiece 6 increases at a stretch. However,
In the present invention, the production of the track rail 7 is started by the action of the guide die 5 without causing the workpiece 6 to buckle. As described above, when the processing die 4 and the guide die 5 are integrated via the spacer 13,
Even in the case of having the long lip end portion 113, buckling of the workpiece 6 can be suppressed as much as possible.

In the manufacturing apparatus 1 ′ of the second embodiment, the extruder 3, the processing die 4 and the guide die 5
It is preferable to further provide a guide member 16 between the buckling prevention die 15 and the buckling prevention die 15. The operation of the guide member 16 is as described above.

Next, a variable die angle device equipped with a buckling prevention device will be described.

FIGS. 7 and 8 show a variable die angle device 8 preferably applied to the manufacturing apparatuses 1 and 1 'of the first and second embodiments. In the present invention, the buckling prevention device 20 may be mounted in the die angle varying device 8 so that the angle of the processing die 4 can be adjusted. The die angle varying device 8 is for adjusting the axis of the track rail 7 pulled out by the pulling device 2 and the axis of the processing die hole arbitrarily to prevent bending of the track rail 7 generated at the processing die exit. Device. The meaning of the axis here is the same as described above. Further, the manufacturing apparatus 1 ′ of the second embodiment
In (2), the working dies 4 and the guide dies 5 are usually integrated to form a buckling prevention die 15, so that the angle of the buckling prevention die 15 is adjusted by the die angle changing device 8.

The specific configuration of the die angle varying device 8 is not particularly limited, and may be the same as that of a die angle varying device generally employed in drawing. The die angle changing device 8 shown in FIGS. 7 and 8 is a processing die 4 or a buckling prevention die 1.
Buckling prevention device 20 provided with the buckling prevention device 5, four adjustment screws 12 for adjusting the angle of the entire buckling prevention device 20 to change the angle of the processing die 4, and the buckling prevention device 20
Mounting member 1 that holds them so that the angles of them can be varied
1 is constituted. The bending of the track rail 7 during the drawing process can be prevented by arbitrarily adjusting the working die angle with the adjusting screw 12 while considering the cross-sectional shape of the track rail 7, the processing reduction rate, the drawing speed, the extrusion stress, and the like. it can.

As the material 6 to be provided to the track rail manufacturing apparatus, a round steel material such as S55C made of a material which has been conventionally preferably used as a material for track rails of a linear guide device is used. Can be used. As the round steel material to be used, one having a diameter according to the shape of the track rail 7 to be processed is arbitrarily selected. When a relatively thin round steel material is used, it is usually supplied as a coil, hung on a feeding device, and supplied to an extruding device 3. At this time, it is preferable to supply the extruder 3 through a straightening device 31 as shown in FIG. Use of the corrected round steel material can further prevent buckling.

According to the track rail manufacturing apparatus 1, 1 'and the track rail manufacturing method of the present invention according to the first and second embodiments, the track rail 7 having a complicated shape as shown in FIG. At the time of starting or during the manufacturing, it is possible to manufacture efficiently without buckling and with a large reduction in processing area. Further, since a processing method including a drawing process and an extrusion process is employed, a desired shape can be easily obtained.

A straightening device for further improving the accuracy of the track rail 7 and a bending device for bending a track rail 7 having a predetermined shape can be provided after the outlet of the drawing device 2. Further, a cutting device for cutting the track rail 7 to a predetermined size can be provided.

Further, before the entrance of the extruder 3, a supply stand for feeding the coil-shaped workpiece 6 is provided.
A straightening device 31 can be provided. Also, a feeding device using a pinch roller can be provided. In particular, since the straightening device 31 can remove bending and undulation of the workpiece 6 before the extrusion device 3,
This is effective in preventing buckling of the workpiece 6 (FIG. 11).
See ).

[0076]

The present invention will be described in more detail with reference to the following examples.

(Example 1) As the material 6 to be processed, the diameter 2
A 1 mm S55C round steel coil was used. As the track rail manufacturing apparatus 1, an extrusion drawing apparatus of the first embodiment as shown in FIG. 1 was used. 9 to pull out force
n, the extrusion force was 12 ton, and the processing speed was set to 20 m / min. The guide member 16 uses a carbide working die having the same diameter as the workpiece 6 and is rigidly and firmly fixed in the buckling prevention device 20 together with the working die 4. Buckling prevention device 20
A commercially available dry-type lubricant was used as a lubricant to be added to the dies. A track rail 7 having a shape shown in FIG. 10 was manufactured with a processing area reduction rate of 55%. The obtained track rail 7 did not suffer seizure, cracking or disconnection, and did not buckle during its manufacture.

On the other hand, the guide member 16 was removed, and a track rail was similarly manufactured. Since buckling often occurred, the processing speed and the area reduction rate were reduced. The conditions under which the track rail could be manufactured without causing buckling were a drawing force of 12 ton, an extrusion force of 8 ton, a processing speed of 5 m / min, and a processing area reduction rate of 40%.

(Embodiment 2) A workpiece 1 having a diameter of 1
A 3.5 mm S55C round steel coil was used. As the track rail manufacturing apparatus 1, an extrusion drawing apparatus of a second embodiment as shown in FIG. 2 was used. All were made of carbide and used a buckling prevention die 15 having the shape shown in FIGS. 5 and 6 in which the processing die 4 and the guide die 5 were integrated via the spacer 13. As a lubricant to be charged, a commercially available dry lubricant was used. 55% reduction in processing area
The track rail 7 having the shape shown in FIG. 10 was manufactured.

First, an S55C round steel material was subjected to a knitting process for a predetermined length by a swaging machine to form a knot portion 112 having a diameter of 6.9 mm. Next, the pulling out of the lip 112 by the pulling-out device 2 was started, the extrusion pulling-out of the round steel material was started, and the production of the track rail was started. The production conditions were as follows: the drawing force was 4.5 tons, the extrusion force was 4 tons, and the processing speed was 20 m / min.

According to this embodiment, the lip end portion 113
At the start of the production of the track rail 7 having reached the processing die 4, the track rail 7 could be produced without causing buckling.

(Embodiment 3) In the above-mentioned Embodiment 2, the guide rail 16 was further attached to manufacture the track rail 7. The guide member 16 is provided with a tapered portion 24 at the tip thereof on the side of the extruding device 3.
And at the intermediate position between the buckling prevention die 15 and the extrusion device 3. The guide member 16 uses a carbide die having the same diameter as the workpiece 6 and a buckling prevention die 15.
Both were rigidly and firmly fixed in the buckling prevention device 20.

The resulting track rail 7 is free from seizure, cracking and disconnection, and can start plastic working with a large reduction in working area without buckling. And the production could be continued.

[0084]

As described above, according to the track rail manufacturing apparatus and the track rail manufacturing method of the first aspect of the present invention, the material to be processed can be held at an appropriate position for preventing buckling. Therefore, occurrence of buckling when manufacturing the track rail can be suppressed. The track rail manufacturing apparatus can perform a single plastic working at a large processing reduction rate without causing buckling, and thus can manufacture the track rail extremely efficiently. In particular, in the present invention, since the core of the guide member and the core of the processing die are made to coincide with each other and are integrally combined, stable production can be achieved without causing misalignment during manufacturing.

Further, according to the track rail manufacturing apparatus and the track rail manufacturing method of the second aspect of the present invention, at the start of manufacturing, the workpiece is deformed in an arbitrary direction having a smaller deformation stress. Since the escape can be prevented, it is possible to prevent the lip end portion from buckling at the entrance of the processing die without being able to pass through the processing die. Therefore, according to this track rail manufacturing apparatus and method, plastic working at a large processing area reduction rate can be started without causing buckling, so that the track rail can be manufactured very efficiently. it can.

Further, by providing a guide member for holding the material to be processed with respect to the processing die without misalignment,
Since the material to be processed can be held at an appropriate position for preventing the buckling of the material to be processed, the buckling of the material to be processed during the production can be suppressed, and the first problem and the second problem can be solved. The two problems can be solved simultaneously.

Therefore, according to the track rail manufacturing apparatus and method, plastic working with a large working area reduction rate can be performed.
Since it is possible to start without buckling and to maintain its manufacture without buckling, the track rail can be manufactured very efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an example of a first embodiment of a track rail manufacturing apparatus of the present invention.

FIG. 2 is a schematic front view showing an example of a second embodiment of the track rail manufacturing apparatus of the present invention.

FIG. 3 is a cross-sectional view illustrating an example of a guide member.

FIG. 4 is a side view showing an example of a buckling prevention device in which a processing die or a buckling prevention die and a guide member are integrated.

FIG. 5 is a cross-sectional view showing an example of a buckling prevention die in which a processing die and a guide die are integrally fixed.

FIG. 6 is a front view showing an example of a processing die and a guide die.

FIG. 7 is a perspective sectional view showing an example of a die angle varying device equipped with a buckling prevention device having a processing die and a guide member.

FIG. 8 is a perspective sectional view showing an example of a die angle varying device equipped with a buckling prevention device having a buckling prevention die in which a processing die and a guide die are integrated and a guide member.

FIG. 9 is a schematic perspective sectional view showing an example in which a cassette roller processing die is used as a guide member.

FIG. 10 is a sectional view showing an example of a sectional shape of a track rail.

FIG. 11 is a schematic perspective view showing an example of a correction device.

FIG. 12 is a schematic perspective view showing an example of a conventional track rail manufacturing apparatus.

FIG. 13 is an explanatory view showing a form in which a material to be processed is strongly pressed against a left-right convex portion of a processing die hole.

FIG. 14 is an explanatory view showing a mode of occurrence of buckling when a track rail is manufactured using a conventional extrusion pull-out device.

FIG. 15 is a perspective view showing an example of a linear guide device incorporated in a machine tool or the like to guide a table or the like for supporting a workpiece;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Track rail manufacturing device 2 Pull-out device 3 Extrusion device 4 Processing die 5 Guide die 6 Workpiece material 7, 121 Track rail 8 Die angle variable device 9 Teeth 10 Sprocket 11 Mounting member 12 Adjustment screw 13 Spacing 15 seat Bending prevention die 16 Guide member 17, 107 Approach portion 18, 108 Bearing portion 19 Cassette roller processing die 20 Buckling prevention device 21 Dice holder 22 Fixed flange 23 Round hole 24 Tapered portion 25 Bolt hole 31 Straightening device 102, 103 Left and right direction Projection 104, 105 Vertical part 106 Die hole 121a Rolling element rolling surface 122 Rolling element 123 Slide member L Length of bearing part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Masayuki Kooka 12th, Nakamachi, Muroran-shi, Hokkaido Inside Nippon Steel Corporation Muroran Works (72) Inventor: Kazuya Yoshida 1303-6, Hase, Atsugi-shi, Kanagawa ) Inventor Takeki Shirai 3-11-6 Nishigotanda, Shinagawa-ku, Tokyo TEK Co., Ltd. Reference) 4E096 EA14 EA22 FA06 GA15

Claims (7)

[Claims] 1. A track rail manufacturing apparatus using an extrusion pulling device comprising a pulling device, an extruding device, and a processing die provided between the drawing device and a processing die for processing a material to be processed into a predetermined sectional shape. A guide member is provided between the extrusion device and the processing die, the guide member holding the workpiece extruded from the extrusion device without misalignment with respect to the processing die, and an inner surface shape of the guide member is provided. An apparatus for manufacturing a track rail, wherein a cross-sectional shape of a workpiece extruded from the extruder is the same as that of the workpiece. 2. A track rail manufacturing apparatus using an extrusion pulling device comprising a pulling device, an extruding device, and a processing die provided between them and processing a material to be processed into a predetermined sectional shape. At the entrance side of the processing die, a guide die adjacent to the processing die is provided, and the inner surface shape of the guide die is substantially the same as the cross-sectional shape of the workpiece material extruded from the extrusion device. An apparatus for manufacturing a track rail, comprising: 3. The track rail manufacturing apparatus according to claim 2, wherein the processing die and the guide die are integrally fixed via a spacer. 4. A guide member is provided between the extruding device and the guide die for holding a workpiece extruded from the extruding device without misalignment with respect to the processing die, and an inner surface of the guide member. The track rail manufacturing apparatus according to claim 2 or 3, wherein the shape is the same as the cross-sectional shape of the workpiece extruded from the extruder. 5. A method of manufacturing a track rail for manufacturing a track rail having a predetermined shape by extruding and drawing a material to be processed by an extruding means and a pulling means provided before and after a processing die. The workpiece extruded by the guide member is provided between the extrusion means and the processing die, and has an inner surface having the same shape as the cross-sectional shape of the workpiece extruded from the extrusion device. A method for manufacturing a track rail, wherein the track rail is extruded and drawn while being held without misalignment with a processing die. 6. A track rail manufacturing method for manufacturing a track rail having a predetermined shape by extruding and drawing a material to be processed by an extruding means and a pulling means provided before and after a processing die. A material die or a workpiece is provided adjacent to an entrance side of the processing die, and an inner surface thereof is guided by a guide die having substantially the same shape as a cross-sectional shape of the workpiece extruded from the extrusion device. A method for manufacturing a track rail, wherein the track rail is extruded and drawn while being processed. 7. The workpiece extruded by the extruding means is provided between the extruding means and the guide die, and has an inner surface having the same sectional shape as the extruded workpiece extruded from the extruding device. The method for manufacturing a track rail according to claim 6, wherein the guide member having a shape is extruded and drawn while being held without misalignment with respect to the processing die.