JPH04153183A - Method and device for manufacturing elevator guide rail - Google Patents

Abstract

PURPOSE:To improve the productivity of a guide rail by cold-extruding a material manufactured by hot rolling, and thereafter, correcting a longitudinal curve. CONSTITUTION:A material 1 manufactured by hot rolling is guided to cold- extruding manufacture 10 by a carrying-in device 9, pushed into an extrusion die 5 while being guided by vertical guide rolls 6a, lateral guide rolls 6b, and molded into a guide rail 4. On the outlet side of the die 5, a curve is corrected by vertical regulating rolls 7a and lateral regulating rolls 7b. The resulting rail is introduced into a correcting device 11 to attain a high straightness, and cut to a proper length by a cutter device 12, subjected to the formation of a mounting hole 4a and an end surface notch 4b by pressing and a guide projection 4c and a guide channel by milling by an end surface working device 13, and then carried out. Thus, the productivity of a guide rail having a sufficient strength and a high dimensional precision can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for manufacturing guide rails for elevators.

[Conventional technology]

As a conventional guide rail for elevators, JP-A-56
There are those shown in Japanese Patent Application Laid-open No. 145084 and Japanese Patent Application Laid-Open No. 116647/1983.

Conventionally, in order to manufacture an elevator guide rail as shown in FIG. 9, it is formed by rolls, cut into lengths of about 5 m, and then holes 2a for attachment are provided.

In this method of manufacturing guide rails for elevators,
The forming speed by the rolls is about 30 m/min,
Processing speed is fast.

Conventionally, in order to manufacture an elevator guide rail as shown in FIG. 3d, the bottom surface 3e and the guide portion 3b are planarized, a step 3f is provided on the bottom surface 3e by milling, and a guide groove (not shown) to be engaged with the guide protrusion 3c or the guide protrusion 3C is provided on the end surface. , a mounting hole 3a is provided.

In this method of manufacturing guide rails for elevators,
Since the guide portion 3b of the guide rail 3 has a solid cross-sectional shape, the guide rail 3 has sufficient strength against the lateral force P generated during an emergency stop of the elevator.

C Problems to be Solved by the Invention] However, in the method of manufacturing an elevator guide rail as shown in FIG.
Since b has a hollow structure, the guide rail 2 has a lateral force P
The strength against is small.

Further, in the method of manufacturing an elevator guide rail as shown in FIG. 10, it is necessary to perform planar processing, and the processing speed of planar processing is slow, resulting in poor productivity.

This invention was made to solve the above-mentioned problems, and includes a method for manufacturing an elevator guide rail that can obtain a guide rail with sufficient strength and excellent productivity, and a method for implementing the manufacturing method. The purpose is to provide manufacturing equipment.

[Means to solve the problem]

In order to achieve this object, in the present invention, a material manufactured by hot rolling is subjected to cold extrusion processing, and then the bending in the longitudinal direction is corrected.

In this case, it is preferable to perform the correction using a plurality of rollers. If even higher straightness is required, it is preferable to use a combination of straightening using a plurality of rollers and straightening using a press.

The difference between the head wall thickness of the material and the wall thickness after cold extrusion is 2
It is preferably m11 or less.

Furthermore, in this invention, a cold extrusion device and a straightening device are provided.

In this case, it is preferable that the straightening device includes a straightening device including a plurality of rollers and a press straightening device.

[Effect]

In this method and apparatus for manufacturing an elevator guide rail, the cross-sectional shape of the guide portion of the guide rail has a solid structure, and the dimensional accuracy of the guide rail is high, so there is no need for cutting with a planar processing machine.

Furthermore, the bends can be corrected by straightening the cold extruded material using a plurality of rollers and press straightening.

If the difference between the head wall thickness of the material and the plate thickness after cold extrusion is 2D or less, the cold extrusion load will be less than 300KN, which will allow the cold extrusion equipment to be downsized and reduce the stress generated in the extrusion die. This also makes it possible to extend the lifespan of the mold.

〔Example〕

FIG. 1 is a diagram showing an elevator guide rail manufacturing apparatus according to the present invention, and FIGS. 2 to 5 are views each showing a part of the elevator guide rail manufacturing apparatus shown in FIG. 1. In the figure, 9 is a carry-in device, 10 is a cold extrusion device, 5 is an extrusion die of the cold extrusion device 10, and 6a
6b is a vertical guide roll provided on the entrance side of the extrusion die 5, and 6b is a left and right guide roll provided on the entrance side of the extrusion die 50. A plurality of sets of the vertical guide roll 6a and left and right guide rolls 6b are provided. And the upper and lower guide rolls 6a1
The distance between the left and right guide rolls 6b is determined by the cross-sectional shape of the material 1, particularly the moment of inertia of the material. For example, 8
In the case of kilorail (weight per 1m length is 8 KgfO guide rail), the interval between the upper and lower guide rolls 6a is set to 1.
．． The distance may be 3 m or less, and the distance between the left and right guide rolls 6b may be 1.4 m or less. 7a is extrusion die 5
7b is a horizontal adjustment roll provided on the exit side of the extrusion die 5; 8 is a bending detector for detecting the amount of bending of the guide rail 4; The positions of the vertical adjustment roll 7a and the left and right adjustment roll 7b are controlled. 11 is a correction device,
As the straightening device 11, a roller leveler 110, a press straightening machine 120, or a combination of both is used.

The roller leveler is composed of a plurality of upper rollers 1lla and lower rollers 1llb, and the leveler with such a structure can be used for vertical correction, horizontal correction, and as necessary for rough correction and finish correction. , two or more sets are provided. The press straightening machine has a movable fulcrum 121 and a pressurizing point 12.
2, and two sets of straightening machines having such a configuration are provided as necessary. 12 is a cutting device; 1
3 is an end face processing device, 14 is a carry-out device, and 15 is a stocker.

Next, the operation of this elevator guide rail manufacturing apparatus, that is, the elevator guide rail manufacturing method according to the present invention will be described. First, when the material 1 manufactured by hot rolling is placed on the carry-in device 9, the material 1 is carried into the cold extrusion device 10, and is pushed into the extrusion die 5 while being guided by the upper and lower guide rolls 6a and the left and right guide rolls 6b. Then, the material 1 is formed into a guide rail 4. Next, on the exit side of the extrusion die 5, a vertical adjustment roll 7a
, the bending of the guide rail 4 is corrected by the left and right adjustment rolls 7b. Next, the guide rail 4 is connected to the straightening device 11.
The straightness of the guide rail 4 becomes high. Next, the guide rail 4 is introduced into the cutting device 12,
The guide rail 4 is cut to about 5 m. Next, the guide rail 4 is introduced into the end face processing device 13, and after forming the mounting hole 4a and the end notch 4g by press working,
The guide projection 4c and a guide groove (not shown) to be engaged with the guide projection 4c are provided by milling. Next, the guide rail 4 is placed on the stocker 15 by the unloading device 14.

In this method and apparatus for manufacturing an elevator guide rail, the guide portion 4b of the guide rail 4 has a solid cross-sectional shape, so the guide rail 4 has sufficient strength against the lateral force P.

Further, since the guide rail 4 is formed by cold extrusion processing using the cold extrusion device 10, the upper surface 4d.

Since the dimensional accuracy of the dimension between the bottom surfaces 4e, that is, the height dimension, and the dimension between the guide parts 4b, that is, the width dimension is high, the top surface 4d
There is no need to cut the bottom surface 4e and the guide portion 4b using a brainer processing machine, and the processing speed of cold extrusion processing is 5 to 10 times that of brainer processing, so productivity is significantly improved, and In cold extrusion processing, no chips are generated, so the yield of the material is greatly improved. Furthermore, since the material 1 is pushed into the extrusion die 5 while being guided by the upper and lower guide rolls 6a and the left and right guide rolls 6b, it is possible to prevent the material 1 from buckling.
can be manufactured. Moreover, since the bending of the guide rail 4 can be corrected by the bending detector 8, the vertical adjustment roll 7a, and the horizontal adjustment roll 7b, it is possible to manufacture a guide rail 4 of good quality.

Elevator guide rails can be used for a variety of purposes, including guide rails for passenger cars;
There are guide rails for counterweights installed on the opposite side of the car via wire lobes, guide rails for high-speed elevators used in high-rise buildings, and guide rails for low-speed elevators on the opposite side. Since high straightness is required for guide rails for cars, etc., correction using a correction device is necessary. Straightening is performed in the vertical and horizontal directions by passing the material through a roller leveler, but due to the roll interval Q1 of the roller leveler, the distance between the leading and trailing ends of the material is 200 to 500 m (approximately equal to Q). ) If it is impossible to straighten this part and it is necessary to straighten this part, press straightening is performed. In press straightening, the distance R between the fulcrum of the pressurizing point can be made small (22 x β1), so the edges of the material can be straightened, and a guide rail with high straightness in the entire area can be obtained.

Further, since the guide projections 4c and the guide grooves are provided by milling after the end notches 4g are formed by press working, the amount of cutting by milling becomes small, so that milling can be carried out in a short time. Also, the seventh
The figure is a graph showing the relationship between the area reduction rate R and the tensile strength σ8 during cold extrusion. As is clear from this graph, as the area reduction rate R increases, the tensile strength σ8 increases. For example, the tensile strength σ8 of material 1, that is, the tensile strength σ8 when the area reduction rate R is Oz, is 440 MPa, whereas the tensile strength σ8 when the area reduction rate R is 10% increases to 500 MPa. do. Therefore, the strength of the guide rail 4 is greater when the guide rail 4 is formed by cold extrusion than when it is formed by planar processing.

Further, FIG. 8 is a graph showing the relationship between the area reduction rate R and the processing force P during cold extrusion processing. As is clear from this graph, as the area reduction rate R increases, the processing force P increases. It is desirable for the processing force to be as small as possible, that is, for the area reduction rate to be as small as possible, from the viewpoint of downsizing the device and extending the life of the extrusion die, but its value is determined by the precision of the material. That is, the tolerance of the material (hot-rolled product) of the width dimension of the guide part (1011 for the finished product of the 8 km rail) is 2n according to the standards of the Japan Elevator Association. therefore,
If the difference between the thickness of the material and the thickness of the product after extrusion is set to 2111, processing can be performed without leaving any unprocessed parts during extrusion. Note that the above-mentioned tolerance of 2 m is a standard value, and due to recent advances in hot rolling technology, the actual tolerance of the material has become a small value.

In the above embodiment, the vertical guide roll 6a and the left and right guide rolls 6b were used as the guide tools, and the vertical adjustment roll 7a and the left and right adjustment rolls 7b were used as the adjustment tools, but other guide tools and adjustment tools could be used. May be used.

Moreover, although it was mentioned above that two or more sets of roller levelers are provided, it is also possible to repeatedly perform vertical and horizontal directions, rough correction, and final correction using one set of roller levelers.

Press straightening can also be performed by using a set of straightening machines to straighten the leading and trailing ends of the material.

〔Effect of the invention〕

As explained above, in the method and apparatus for manufacturing an elevator guide rail according to the present invention, since the cross-sectional shape of the guide portion of the guide rail has a solid structure, it is possible to obtain a guide rail with sufficient strength. Also, since there is no need for cutting with a brainer processing machine, productivity is excellent.

In addition, cold extrusion processing is performed while guiding the material with a guide tool, and after cold extrusion processing, the guide rail is pushed out with an adjustment tool while detecting the bending of the guide rail, or the cold extrusion device is Buckling of the material can be prevented by installing a guide to guide the material on the inlet side of the extrusion die, and a bending detector to detect the bending of the material and an adjustment tool to adjust the bending of the material on the exit side of the extrusion die. Since the guide rail can be manufactured reliably, the bending of the guide rail can be corrected, so a guide rail with good quality can be manufactured. Furthermore, if the bends are corrected using a roller leveler or press straightening, a guide rail with even higher straightness can be obtained.

Furthermore, if a guide protrusion and a guide groove are provided at the end of the guide rail after performing cold extrusion processing and forming an end notch at the end of the guide rail by punching, the guide protrusion and guide groove can be provided at the end of the guide rail.
Since the amount of cutting required for providing the guide groove is reduced, the cutting can be performed in a short time.

As described above, the effects of this invention are remarkable.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an elevator guide rail manufacturing apparatus according to the present invention, FIGS. 2 to 5 are views showing a part of the elevator guide rail manufacturing apparatus shown in FIG. 1, and FIG. The figure is a perspective view showing a part of the guide rail manufactured by the elevator guide rail manufacturing apparatus shown in Figure 1, and Figure 7 shows the relationship between the area reduction rate R and tensile strength σ8 during cold extrusion. FIG. 8 is a graph showing the relationship between the area reduction rate R and processing force P during cold extrusion processing, and FIGS. 9 and 10 are perspective views showing conventional elevator guide rails. be. 1...Material 4...Guide rail 4c...Guide protrusion 4g--End notch 5...Extrusion die 6a...・・・ 6b ・・・・・・ 7a ・・・・・・ 7b ・・・・・・ 8 ・・・・・・ 9 ・・・・−・ 10 ・・・・・・ 110 ・・・ 121 ・・・ Vertical guide roll Left and right guide roll Vertical adjustment roll Left and right adjustment roll Bend detector Carrying device Cold extrusion device Roller leveler press Straightening machine 42 Diagram n °tα OL 6゛ Closed Diagram 5e b 〒4Figure 1n 11b 〒5 Kasumi 〒6 figure 4 $ C smell 4a 4 mountains completed q figure # side> relative father f (γ・) closed figure, i# door μJ thickness level (zl skewer shaku (n-) pox 3 figure

Claims (1)

[Claims] 1. A method for manufacturing an elevator guide rail, which comprises correcting longitudinal bends after cold extruding a material manufactured by hot rolling. 2. The method for manufacturing an elevator guide rail according to claim 1, wherein the correction is performed using a plurality of rollers. 3. The method for manufacturing an elevator guide rail according to claim 1, wherein the straightening is carried out in the vicinity of both ends of the cold extruded material by a press, and in the other parts by a plurality of rollers. 4. The elevator guide according to claim 1, wherein a material is used in which the difference between the head wall thickness of the material manufactured by hot rolling and the wall thickness after cold extrusion is 2 mm or less. How to manufacture rails. 5. An elevator guide rail manufacturing device comprising a cold extrusion device and a straightening device for straightening the cold extruded material. 6. The elevator guide rail manufacturing apparatus according to claim 5, wherein the straightening device comprises a straightening device comprising a plurality of rollers and a press straightening device.