JP2009090311A - Rolling roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling roll, in which, even if rattling is generated due to wear of a shaft, the rattling is eliminated by simple work, and which further has an effect of remarkable cost reduction. <P>SOLUTION: A rolling roll 10 has a shaft 1 extending along an axial line C, and a torque receiving face 3, to which rotary torque of a rolling mill is transmitted, is formed on one end part 2 of the shaft 1. An attaching recess 4, which is dented toward the inside of the shaft 1, is formed at least on a part of the torque receiving face 3. A protection member 5 is attachably/detachably mounted on the attaching recess 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling roll provided with a shaft supported by a rolling mill.

  In general, when a metal is rolled, it is widely performed to continuously roll a metal material as a workpiece by a rolling roll having a rolled portion formed on the outer peripheral surface. In such a rolling roll, one end of the shaft is connected to a chock for transmitting the drive of the output shaft of the rolling mill, and the rolling roll is rotationally driven to roll the metal material in the rolling portion. It is like that.

  The chock is provided with a bottomed hole for fitting one end of the shaft. In connecting the chock and the shaft, for the purpose of reliably transmitting the rotation of the chock to the shaft and simplifying the connection operation, the outer peripheral shape of the end portions of the shafts to be fitted to each other and the chock are connected. The inner peripheral shape of the bottomed hole portion is formed into a substantially oval shape and a substantially oval hole shape in cross sections orthogonal to the axis (see, for example, Patent Document 1).

  That is, one end portion of the shaft is formed in a shape in which the cylindrical outer periphery is scraped off on two parallel planes (torque receiving surfaces) arranged opposite to each other about the rotation axis of the shaft. In addition, the bottomed hole portion of the chock is such that the inner circumference of the cylindrical hole shape is flattened flat on two parallel planes (torque transmission surfaces) opposed to each other centering on the rotation axis of the chock. It is formed into a shape.

And the two-surface width sandwiched between the two torque receiving surfaces on the outer periphery of one end of the shaft is set slightly smaller than the two-surface width between the two torque transmission surfaces on the inner periphery of the bottomed hole portion of the chock The connection is made by fitting them together.
JP 2007-21549 A

 By the way, in such a connecting portion between the shaft and the chock, there is provided a very small gap for fitting as described above. Here, when an excessive load is continuously applied to this connecting portion during rolling or a biting impact at the start of rolling is applied, the outer periphery of the shaft facing the gap and the inner periphery of the chock collide with each other. Will come into contact.

 Here, since the Rockwell hardness of the shaft is generally set to a value lower than the Rockwell hardness of the chock, the shaft is preferentially worn by contact as described above. The wear is particularly noticeable at the two torque receiving surfaces at the one end. This is presumed to be because the shaft receives most of the thrust of the rotational driving of the chock at the two torque receiving surfaces of the one end.

 However, if the rolling is continued while the one end portion of the shaft is worn in this manner, the wear is further promoted, and a large backlash occurs in the connecting portion. This rattling affects the smooth rotational motion of the rolling roll, and thus causes a problem that the rolling accuracy of the manufactured product cannot be ensured.

 In order to ensure good rolling accuracy, it is necessary to replace the worn rolling roll at one end of the shaft, but such a rolling roll is very expensive and its weight reaches several hundred kg. The replacement work required a great deal of cost, time, and labor.

 Moreover, although the method of building up this worn part by plating, welding, etc. can also be considered, there exists a problem that a precision and intensity | strength cannot be ensured favorably by such building up. In addition, in order to suppress wear at one end of the shaft, it is possible to increase the hardness by subjecting the one end to induction hardening or the like, but such processing causes wear on the connected chock side. Or another problem that the one end is cracked.

 The present invention has been made in view of the above-mentioned problems, and when the shaft is worn and rattling occurs, the rattling can be removed with a simple operation and has a significant cost reduction effect. The purpose is to provide a roll.

  In order to achieve the above object, the present invention proposes the following means. That is, the present invention is a rolling roll having a shaft extending along an axis, and a torque receiving surface to which rotational torque of a rolling mill is transmitted at one end of the shaft, the torque receiving surface At least a part of the shaft is provided with a mounting recess recessed inward of the shaft, and a protective member is detachably mounted on the mounting recess.

 According to the rolling roll according to the present invention, due to the gap for mutual fitting provided between one end portion of the shaft of the rolling roll and the bottomed hole portion of the chock connected thereto, For example, even when a torque receiving surface made of a flat surface is worn and rattling occurs, the rattling can be achieved only by replacing the protective member that is mounted in the mounting recess of the torque receiving surface and forms the torque receiving surface. It is possible to remove the tack.

 That is, there is no need to build up a portion of the torque receiving surface that has been worn as in the prior art or to replace the rolling roll itself that is integrally formed with the torque receiving surface, and the protection that is attached to the mounting recess. Since it is only necessary to remove the member and replace it with a new protective member, it is possible to easily remove the looseness in a short time and to ensure its dimensional accuracy, thereby achieving a significant cost reduction effect.

 In the rolling roll of the present invention, the hardness of the protective member may be set to a value higher than the hardness of the shaft. According to this, the shaft of the rolling roll has a protective member attached to the portion of the torque receiving surface that receives the thrust of the rotational movement of the chock, and the hardness of the protective member is the shaft provided with the torque receiving surface. Since it is set to a value higher than the hardness of the one end portion, the wear of the torque receiving surface is favorably suppressed. Therefore, the occurrence of the rattling is effectively suppressed, and the work frequency for removing the rattling can be surely reduced, so that productivity is improved.

 In the rolling roll of the present invention, the Rockwell hardness of the protective member may be set in a range of 40 HRC or more and 50 HRC or less. According to this, the Rockwell hardness of the protective member attached to one end portion of the shaft of the rolling roll is set to be higher than a value of about 30 HRC to 40 HRC which is a typical Rockwell hardness of the shaft. In addition, the value is set low for a value exceeding 50 HRC which is the Rockwell hardness of the connected chock.

 Therefore, this protective member is interposed between one end of the shaft and the chock, so that the shaft can be worn out quickly due to the direct contact between the one end of the shaft and the chock as in the prior art. There exists an effect which suppresses and there is also no possibility of wearing out the chock side.

 Further, in the rolling roll of the present invention, the corner portion where the side wall portion and the bottom portion of the mounting recess intersect each other has a circular cross section, and the radius of curvature R of the circular arc is set to 2 mm or more. Good. According to this, the protective member of the torque receiving surface portion of the one end portion that receives the thrust of the rotational movement of the chock is fitted with the side wall portion and the bottom portion being in contact with the side wall portion and the bottom portion of the mounting recess. The mounting recess is pressed toward the side wall and the bottom. Here, the mounting recess is formed such that the cross section of the corner where the side wall and the bottom intersect with each other has an arc shape, and is formed so that they are smoothly connected. Generation | occurrence | production can be prevented effectively and durability improves.

  According to the rolling roll according to the present invention, even when the shaft is worn and rattling occurs, the rattling can be removed by a simple operation and has a significant cost reduction effect.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a schematic plan view showing one end of a rolling roll according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a II-II cross section of FIG.

  As shown in FIG. 1, the rolling roll 10 according to the present embodiment has a shaft 1 that is a main body portion formed of, for example, an SCM material having a Rockwell hardness of 35 HRC, and one end side of the shaft 1 (in FIG. 1). A shaft drive unit (one end) 2 disposed on the left side is connected to a chock (not shown) of a rolling mill and is a so-called cantilever type rolling roll 10 that rotates around an axis C. Further, a sleeve member is provided on the other end side (the right side in FIG. 1) of the shaft 1 (not shown) so as to cover the outer periphery of the shaft 1, and a molding groove serving as a rolling portion is formed on the outer peripheral surface of the sleeve member. It is provided and a metal material such as a wire or a bar of the workpiece is continuously rolled in the forming groove.

 As shown in FIG. 2, the shaft drive unit 2 has a substantially cylindrical outer periphery cut off by a torque receiving surface 3 having two parallel planes whose cross-sectional shapes are opposed to each other about the axis C. It is formed in a substantially oval shape or a substantially oval shape. The two-surface width (outer dimension in the vertical direction in FIG. 2) formed so as to be sandwiched between these two torque receiving surfaces 3 is, for example, about 100 mm, although it depends on the outer diameter of the shaft drive unit 2.

 Further, as shown in FIG. 1, the end portion 2a on one end side of the shaft driving portion 2 is formed so as to be inclined so that the shape gradually decreases in diameter from the other end side toward the one end side. Further, two lock pin engagement grooves 2 b are provided on the outer periphery of the shaft driving portion 2 so as to be formed perpendicular to the surface forming direction of the torque receiving surface 3. When the lock pin is connected to the chock, the lock pin is engaged with the lock pin engaging groove 2b so that the rolling roll 10 and the chock are prevented from coming off so as not to move relative to each other in the direction of the axis C. It has become.

 Further, the torque receiving surface 3 is provided with a mounting recess 4 having a substantially rectangular hole shape so that the edge 3a is left in a substantially U shape or a frame shape on the flat surface. In the mounting recess 4, the cross section of the corner 4 c where the four side walls 4 a perpendicular to the torque receiving surface 3 intersect with the bottom 4 b of the surface parallel to the torque receiving surface 3 has an arc shape. It is formed so as to be connected. For example, in FIG. 2, the width dimension between the side wall portions 4a and 4a arranged at the left and right ends of the mounting recess 4 is about 100 mm, and the depth from the torque receiving surface 3 to the bottom portion 4b is about 10 mm. It is said that. In other words, the depth from the torque receiving surface 3 to the bottom 4b is set to be about 10% of the width dimension of the mounting recess 4. Moreover, the curvature radius R of the corner | angular part 4c of circular arc shape is set to about 5 mm, for example.

 Further, as shown in FIG. 1, the adjacent side wall portions 4a, 4a of the mounting recess 4 are also connected to each other by being formed in a smooth arc shape, and the radius of curvature R of this arc is, for example, about 5 mm. ing. Also, four female screw holes 4d are formed in the vicinity of the four corners of the bottom 4b of the mounting recess 4 so as to be drilled perpendicularly to the bottom 4b.

  Each mounting recess 4 is provided with a substantially rectangular flat plate (protective member) 5. That is, these plates 5 are provided separately from the shaft driving unit 2 and are formed of, for example, an SKD material having a Rockwell hardness of 45 HRC. Further, in the mounted state, a surface formed on the side opposite to the axis C side of the plate is flush with the edge 3a to constitute the torque receiving surface 3. Further, the plate 5 has almost no gap so that the four side walls 5a, the bottom 5b of the bottom, and the corner 5c connecting them are in contact with the side 4a, the bottom 4b and the corner 4c of the mounting recess 4, respectively. It is fitted.

  Further, in the vicinity of the four corners of the flat portion of the plate 5, four countersunk screw mounting holes 5 d are formed so as to be arranged coaxially with the female screw hole 4 d of the mounting recess 4. Then, four countersunk screws 6 are respectively inserted into these countersunk screw mounting holes 5 d and screwed into the female screw holes 4 d of the mounting recesses 4, so that the plate 5 is fixed to the mounting recesses 4. A female screw hole 5 e is provided through the plate 5 at substantially the center of the flat portion of the plate 5.

Next, the operation of the rolling roll 10 of this embodiment will be described.
First, the shaft driving unit 2 on one end side of the rolling roll 10 is connected to a chock of a rolling mill. Here, in general, the chock is made of, for example, a steel material having a Rockwell hardness exceeding 50 HRC, and has a substantially bottomed cylindrical shape so that it can be driven to rotate. The inner periphery of the chock is provided with a bottomed hole portion for inserting the shaft driving portion 2, and the shape of the bottomed hole portion is a substantially oval hole shape or a substantially cross-sectional shape capable of receiving the shaft driving portion 2. It is formed in an elliptical hole shape. A very small gap for connection is provided between the chock fitted to each other and the shaft driving unit 2.

  After the shaft driving unit 2 is inserted into the chock, the lock pin is engaged with the lock pin engaging groove 2b to prevent the shaft from coming off, and the connection is completed, when the chock is driven to rotate, the rotation is driven by the shaft driving unit. 2, the rolling roll 10 rotates about the axis C, and a metal material such as a wire or a bar is rolled.

 According to the rolling roll 10 of the present embodiment, the shaft drive unit 2 is caused by the gap for mutual fitting provided between the shaft drive unit 2 of the shaft 1 and the bottomed hole portion of the chock connected thereto. Even when the torque receiving surface 3 is worn and rattling occurs, the rattling can be removed by simply replacing the plate 5 attached to the mounting recess 4 of the torque receiving surface 3. .

That is, it is not necessary to build up the worn portion of the torque receiving surface 3 as in the prior art or to replace the rolling roll 10 formed integrally with the torque receiving surface 3, and it is attached to the mounting recess 4. Since it is only necessary to remove the plate 5 and replace it with a new plate 5, it is possible to easily remove the rattle and to perform the removal operation in a short time and to ensure the dimensional accuracy, thereby achieving a significant cost reduction effect.
In addition, after the plate 5 is replaced, it is not necessary to perform an additional work or the like in a state where the plate 5 is mounted on the shaft drive unit 2, so that the replacement workability is further improved.

 Here, it can be assumed that the plate driving portion 2 is not provided with the mounting recess 4 and the plate 5 is directly mounted on the torque receiving surface 3, but in this case, an external force in the direction between the side wall portions 5a and 5a of the plate 5 is assumed. Is received by the shaft portion of the countersunk screw 6 and the countersunk screw 6 breaks or the plate 5 cracks from the countersunk screw mounting hole 5d. In addition, it is preferable that the mounting recess 4 is fitted so that the plate 5 is embedded.

 Further, the Rockwell hardness of the plate 5 forming the torque receiving surface 3 is set to 45 HRC, which is set to a value higher than the 35 HRC of the Rockwell hardness of the shaft driving unit 2 of the shaft 1, so this torque Wear of the receiving surface 3 is suppressed satisfactorily, and the occurrence of backlash is effectively suppressed. Therefore, since the work frequency for removing the rattling can be surely reduced as compared with the conventional case, productivity is improved.

 Further, since the Rockwell hardness of the plate 5 is 45 HRC, the value is set low for a value exceeding 50 HRC which is the Rockwell hardness of the connected chock. Therefore, there is no possibility that the plate 5 is worn due to the plate 5 coming into contact with the chock, so that it is not necessary to replace the expensive chock with a troublesome replacement work.

 The corner 4c where the side wall 4a and the bottom 4b of the mounting recess 4 intersect has an arcuate cross section, and the radius of curvature R of this arc is about 5 mm. The plate 5 of the torque receiving surface 3 of the shaft drive unit 2 that receives the thrust of the rotational movement of the chock is fitted so that the side wall 5a and the bottom 5b are brought into contact with the side wall 4a and the bottom 4b of the mounting recess 4. Therefore, the mounting recess 4 is pressed toward the side wall 4a and the bottom 4b. Here, the mounting recess 4 is formed so that the cross section of the corner portion 4c where the side wall portion 4a and the bottom portion 4b intersect each other has an arc shape, and is formed so as to be smoothly connected. It is possible to effectively prevent cracks from being generated from the portion 4c, and durability is improved.

 Further, the width of two surfaces formed so as to be sandwiched between the two torque receiving surfaces 3 of the shaft driving portion 2 is about 100 mm, and the side wall portions 4a and 4a are oriented in the direction perpendicular to the axis C of the mounting recess 4. The width dimension between them is about 100 mm, the depth from the torque receiving surface 3 to the bottom portion 4 b is about 10 mm, and the depth from the torque receiving surface 3 to the bottom portion 4 b is the width dimension of the mounting recess 4. The plate 5 is mounted so as to be flush with the mounting recess 4. Accordingly, the shaft driving unit 2 and the plate 5 are sufficiently thick with respect to the external force orthogonal to the axis C, so that the strength is ensured.

 Further, when the plate 5 to be mounted so as to be fitted into the mounting recess 4 is replaced, a screw having a sufficient length is screwed into the female screw hole 5e provided in the approximate center of the plate 5 and It is only necessary to remove the plate 5 by pressing the bottom 4b of the mounting recess 4 with the tip of the screw and separating the bottom 4b from the bottom 5b of the plate 5. It can be performed in a short time. In addition, it is preferable to cover the female screw hole 5e of the plate 5 so that water or the like does not enter during rolling.

 In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention. For example, in this embodiment, the plate 5 is formed of an SKD material having a Rockwell hardness of 45 HRC. However, the present invention is not limited to this, and a material other than the SKD material is used as long as the Rockwell hardness is in the range of 40 HRC to 50 HRC. It doesn't matter.

 In the present embodiment, the plate 5 has a substantially rectangular flat plate shape, and the mounting recess 4 in which the plate 5 is mounted is described as a rectangular hole shape. However, the present invention is not limited to this combination. You may form in other combined shapes, such as a shape.

It is a schematic plan view which shows the one end part of the rolling roll which concerns on one Embodiment of this invention. It is sectional drawing which shows the II-II cross section of FIG.

Explanation of symbols

1 Shaft 2 Shaft drive (one end)
3 Torque receiving surface 4 Mounting recess 4a Side wall 4b Bottom 4c Corner 5 Plate (protective member)
10 Rolling roll C Shaft axis

Claims (4)

A rolling roll having a shaft extending along an axis, and having a torque receiving surface to which rotational torque of a rolling mill is transmitted at one end of the shaft,
At least a part of the torque receiving surface is provided with a mounting recess that is recessed toward the inside of the shaft,
A rolling roll characterized in that a protective member is detachably mounted in the mounting recess. The rolling roll according to claim 1,
The rolling roll characterized by the hardness of the said protection member being set to the value higher than the hardness of the said shaft. The rolling roll according to claim 1 or 2,
The rolling roll characterized by the Rockwell hardness of the said protection member being set to the range of 40 HRC or more and 50 HRC or less. A rolling roll according to any one of claims 1 to 3,
A rolling roll characterized in that a corner portion where the side wall portion and the bottom portion of the mounting recess intersect has an arc shape in cross section, and a radius of curvature R of the arc is set to 2 mm or more.

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