JP3722181B2 - Rolling processing method and rolling processing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling processing method and a rolling processing apparatus, and more particularly to an improvement in a support roller that is disposed between a pair of rolling round dies and supports a cylindrical material.
[0002]
[Prior art]
While supporting a metal columnar material with a cylindrical support roller rotatably arranged around an axis parallel to the axis of the rolled round die between the pair of rolled round dies, A rolling process method in which the cylindrical material is clamped between rolling round dies and rotated around an axial center to form a predetermined ridge on the outer peripheral surface of the cylindrical material. No. 5-78334 and JP-A-7-185712. The cylindrical material is supported by the support roller at a position where the shaft center is slightly deviated from the straight line connecting the shaft centers of the pair of rolling dies so that the cylindrical material does not jump out due to rolling load (clamping pressure). It has become. For this reason, a cylindrical material is pressed to the support roller at a predetermined pressure corresponding to the rolling load, and generally a hard material such as steel or cemented carbide hardened by heat treatment is used.
[0003]
[Problems to be solved by the invention]
However, when such a hard support roller is used, the tops of the ridges rolled by a pair of rolling round dies may be flattened. There is no problem when the ridges are originally flat and relatively large, or when high shape accuracy is not required. For example, a spiral shape having a height of about 5 μm to 100 μm and a top section forming an arc shape. In the case of a coating rod in which the ridge is formed on the outer peripheral surface, when the tip of the arc-shaped ridge is crushed and flattened, the cross-sectional area of the valley between the ridges, in other words, the amount of the coating solution changes, Such crushing of the top of the ridge greatly affects the quality.
[0004]
The present invention has been made against the background of the above circumstances, and its object is to prevent the top of the ridge formed by rolling from being pressed and crushed by the support roller.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the first invention is a cylindrical support roller disposed between a pair of rolling round dies so as to be rotatable about an axis parallel to the axis of the rolling round die. While supporting the cylindrical material made of steel, the cylindrical material is sandwiched between the pair of rolling round dies and rotated around the axis to perform the rolling process. In the rolling process method formed on the outer peripheral surface, the rolling process is performed while supporting the columnar material using a support roller that is made of a soft material whose at least the outer peripheral part is elastically deformed by the ridges. It is characterized by.
[0006]
According to a second invention, in the first invention, the support roller is a metal cored bar provided with a predetermined thickness of a synthetic resin mainly composed of ultrahigh molecular weight polyethylene as the soft material on the outer periphery of the metal core. It is characterized by that.
[0007]
A third invention is the first invention or the second invention, wherein the columnar material is rolled in the axial direction while being rolled by the pair of rolling round dies, so that the height of the top section is about 5 μm to 100 μm. It is characterized by manufacturing a coating rod in which spiral ridges having a circular arc shape are provided on the outer peripheral surface.
[0008]
The fourth invention is: (a) a pair of rolling round dies which are arranged so as to be rotatable around mutually parallel axes, and perform rolling while rotating around the axis while sandwiching a metal columnar material. And (b) disposed between the pair of rolling round dies so as to be rotatable about an axis substantially parallel to the axis of the rolling round die, and according to the rolling load of the rolling round die. (C) a rolling processing apparatus for forming predetermined ridges on the outer peripheral surface of the columnar material, the columnar support roller being rotated along with the rotation of the columnar material. (D) The support roller is characterized in that a synthetic resin mainly composed of ultrahigh molecular weight polyethylene as the soft material is provided at a predetermined thickness on the outer periphery of a metal cored bar. .
[0009]
【The invention's effect】
According to the rolling process method of the first invention, the rolling process is performed while supporting the columnar material using the support roller having at least the outer peripheral portion made of the soft material. Therefore, the elastic deformation of the soft material is performed. Thus, it is possible to prevent the top of the rolled ridge from being flattened and flattened, and even if the top section is a ridge such as an arc shape, the rolling can be performed with high shape accuracy.
[0010]
The support roller according to the second aspect of the present invention is a metal columnar material because a synthetic resin mainly composed of ultrahigh molecular weight polyethylene as a soft material is provided at a predetermined thickness on the outer periphery of a metal cored bar. The ridges are suitably prevented from being crushed, and the metal cored bar provides sufficient and sufficient mechanical strength as a support roller. In addition, ultrahigh molecular weight polyethylene has an extremely small friction coefficient and excellent wear resistance, so that relatively excellent durability is obtained although not as high as that of a metal. Also in the through rolling in which the rolling process is performed while forcibly moving the cylindrical material, the columnar material can be smoothly moved on the support roller without crushing the tops of the rolled ridges.
[0011]
The third invention is a case of manufacturing a coating rod having a spiral ridge provided on the outer peripheral surface with a height of about 5 μm to 100 μm and a top section having an arc shape by thread rolling. By providing the shape ridges with high shape accuracy, a product having a desired cross-sectional area (amount of coating solution) of the valleys between the ridges can be stably manufactured.
[0012]
Since the rolling processing apparatus of the fourth invention has a support roller provided with a predetermined thickness of a synthetic resin mainly composed of ultrahigh molecular weight polyethylene as a soft material on the outer peripheral portion of a metal core bar, The same effect as the second invention can be obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Here, as the soft material that is elastically deformed by the ridges formed by rolling, a synthetic resin mainly composed of ultrahigh molecular weight polyethylene as in the second invention is preferably used, but other synthetic resins and brass are used. It is also possible to use a metal such as, which is appropriately set according to the material of the columnar material to be rolled. As the ultra high molecular weight polyethylene, those having an average molecular weight of 1 million or more, preferably 5.5 million or more, or those having an intrinsic viscosity of about IV = 25 to 28 are suitably used.
[0014]
The support roller of the second invention is obtained by, for example, heating a synthetic resin previously formed into a cylindrical shape to about 80 ° C., and then press-fitting a metal core such as SUJ2 (carbon steel for mechanical structure) into the cylinder. , And can be integrally provided on the outer periphery of the metal core by press-fitting and welding. It is possible to fix only by press-fitting or fix using an adhesive. The thickness of the synthetic resin varies depending on the material of the columnar material in order to prevent the protrusions from being crushed while ensuring a predetermined strength, but for example, about 0.5 to 3 mm is appropriate. In carrying out the first invention, the entire support roller can be made of a soft material such as synthetic resin.
[0015]
The present invention manufactures a coating rod in which a spiral convex strip having a height of about 5 μm to 100 μm and an arcuate cross section is provided on the outer peripheral surface by thread rolling as in the third aspect of the present invention. However, the present invention can also be applied to the case of manufacturing other products (parts) such as screws and serrations, and the case of rolling a cylindrical material without moving it in the axial direction. The present invention is also preferably applied to a case where the top cross-sectional shape of the ridge is a triangle or a narrow trapezoid. The coating rod is for thinly and uniformly applying a fluid such as a liquid to a predetermined belt-like support such as a photographic film, and stainless steel such as SUS304 is preferably used.
[0016]
The columnar material and the support roller do not necessarily have to be a complete cylinder having a constant diameter, and the diameter may change in the axial direction according to the product shape to be processed. Further, a backup roller that rotates with the support roller can be provided on the rear side of the support roller.
[0017]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing a rolling processing apparatus 10 that can suitably carry out the rolling processing method of the present invention, and is a pair arranged to be rotatable about axes O ₁ and O ₂ that are substantially horizontal and parallel to each other. Rolling dies 12 and 14, and a rotary rest 18 that is disposed between the rolling dies 12 and 14 and supports the metal columnar material 16. The rolling round die 12 is provided at a fixed position, while the rolling round die 14 is moved by a slide device (not shown) in a horizontal direction perpendicular to the axis O ₂ , so that the rolling round die 12 is moved relative to the rolling round die 12. While being approached and separated, it is rotationally driven at a predetermined rotational speed by a driving means (not shown) in a predetermined rotational direction (a counterclockwise direction indicated by an arrow in FIG. 1). Further, these rolling round dies 12 and 14 have equal diameter dimensions and width dimensions (axial lengths), and are provided with processing surfaces 20 and 22 on the entire outer periphery thereof. The processing surfaces 20 and 22 are provided with a plurality of processing teeth having a predetermined height and a cross-sectional shape in order to roll a predetermined protrusion such as a screw, serration, or spline on the outer peripheral surface of the cylindrical material 16. In addition, the cylindrical material 16 is pressed around the rolling round die 12 by driving the rolling round die 14 while the cylindrical material 16 is rotated around the axis S by the rotational driving of the rolling round die 14. The rolling process is performed. In this embodiment, the coating rod is provided with a spiral ridge having a pitch of about 0.1 to 0.4 mm, a height of about 5 μm to 100 μm, and a top section having an arc shape on the outer peripheral surface. In order to manufacture the processed material 20 having a cross-sectional shape corresponding to the valleys between the ridges, the processed surfaces 20 and 22 are forcibly rolled in the axial direction while rolling the cylindrical material 16. Move and roll through. As the columnar material 16, a stainless steel rod having a diameter of about 10 to 30 mm and a length of about 300 mm to 4500 mm is used.
[0018]
A rotary rest 18 provided to rotatably support the cylindrical material 16 to be rolled between the rolling round dies 12 and 14 is fixed below the rolling round dies 12 and 14. It is fixed on the base member 24 via a position adjusting slider 26. As can be seen from FIG. 2 showing the perspective view of the rotary rest 18, a cylindrical support roller 30 having a predetermined axial length and a pair of struts positioned outside both ends of the support roller 30. And a roller holding base 38 that is attached to the slider 26 and includes a center hole formed in the support roller 30 and a center (for example, a ball or the like) provided in the support columns 34 and 36. The support roller 30 is held so as to be rotatable about the axis by engagement or the like. The rotary rest 18 is disposed at a position where the shaft center of the support roller 30 is substantially parallel to the shaft centers O ₁ and O _{2 of the} rolling round dies 12 and 14 and is substantially parallel to the support roller 30. The axial center S of the cylindrical material 16 to be formed is predetermined in advance slightly below the reference height L that is a straight line connecting the axial centers O ₁ and O ₂ throughout the rolling process. Adjustment is made based on the outer diameter dimension of the columnar material 16 so as to be within the predetermined range. As a result, the columnar material 16 is pressed against the support roller 30 with a predetermined pressure corresponding to the rolling load, and is rotated along with the rotation of the columnar material 16.
[0019]
As shown in FIG. 3, the support roller 30 is composed of a metal columnar cored bar 40 such as SUJ2 (carbon steel for mechanical structure), and a cylindrical composite fixed to the outer periphery of the cored bar 40. And resin 42. The synthetic resin 42 corresponds to a soft material that is elastically deformed by protrusions formed by rolling on the outer peripheral surface of the columnar material 16. For example, “Saxin New Light (trade name of Sakushin Kogyo Co., Ltd.)”. The main raw material is an ultra-high molecular weight polyethylene having an average molecular weight of 5.5 million or more and an intrinsic viscosity of about IV = 25 to 28, and after heating the synthetic resin 42 previously formed into a cylindrical shape to about 80 ° C., By press-fitting the cored bar 40 into the cylinder, the cored bar 40 is integrally provided on the outer periphery of the cored bar 40 by press-fitting and welding. The thickness of the synthetic resin 42 is set to about 2 mm in consideration of the material of the columnar material 16 in order to prevent the protrusions from being crushed while ensuring a predetermined strength.
[0020]
According to the rolling method using the rolling device 10 as described above, the rolling process is performed while supporting the columnar material 16 using the support roller 30 provided with the synthetic resin 42 on the outer peripheral portion. The elastic deformation of the synthetic resin 42 suppresses crushing and flattening the tops of the rolled ridges, and the ridges having a circular cross section at the top are rolled with high shape accuracy. Thereby, it becomes possible to stably manufacture a coating rod having a desired cross-sectional area (amount of coating solution) in the valleys between the ridges.
[0021]
The synthetic resin 42 is mainly made of ultra high molecular weight polyethylene and is provided at a predetermined thickness on the outer peripheral portion of the metal core 40, so that the protrusions of the cylindrical columnar material 16 made of stainless steel are crushed. Is preferably prevented, and the metal cored bar 40 provides the necessary and sufficient mechanical strength for the support roller 30.
[0022]
In addition, ultra-high molecular weight polyethylene has a very low coefficient of friction and excellent wear resistance, so that it can achieve relatively excellent durability but not as much as metal, and forcibly moves the cylindrical material 16 in the axial direction. Even in the case of through rolling, in which the rolling process is performed, the columnar material 16 can be smoothly moved on the support roller 30 without crushing the tops of the projected ridges.
[0023]
Incidentally, FIG. 4A shows a case in which SUS304 (JIS standard) having a diameter of 12.7 mm is used as the columnar material 16, and the pitch is about 0.2 mm and the height is set by the rolling processing apparatus 10 of this embodiment. FIG. 4 (b) shows the result of measurement by measuring the irregular shape of the outer peripheral portion in the axial direction by rolling through a spiral ridge 50 having a circular cross section at the top of about 30 μm and rolling. It is a measurement result of the uneven | corrugated shape of the outer peripheral part at the time of performing a rolling process by supporting the cylindrical raw material 16 with the support roller made from a hard alloy. As is clear from this result, the peak of the ridge 52 is flattened in (b), whereas in (a) the ridge 52 is rolled using the rolling device 10 of this embodiment. The 50 mountain peaks form the desired arc shape.
[0024]
As mentioned above, although the Example of this invention was described in detail based on drawing, this invention can also be implemented in another aspect.
[0025]
For example, in the above-described embodiment, the description has been given of the through rolling that performs the rolling process while forcibly moving the columnar material 16 in the axial direction. However, the rolling process is performed without moving the columnar material 16 in the axial direction. The present invention can also be applied to cases.
[0026]
Moreover, although the said Example demonstrated the case where one rolling round die | dye 14 was rolled with approaching the other rolling round die | dye 12, it had a biting part etc. in a part of outer peripheral part. The present invention can also be applied to a rolling processing apparatus that uses a pair of rolling round dies provided with protruding processing surfaces to perform rolling processing in a state in which the distance between the axes is kept constant.
[0027]
Further, the rotary rest 18 in the above embodiment is fixed so as not to move relative to the base member 24. However, when the columnar material 16 moves in the axial direction at the time of rolling processing, the rotary rest 18 does not move. It may be possible to move in a direction parallel to the axial direction so that it can follow.
[0028]
Although not illustrated one by one, the present invention can be implemented in variously modified and improved modes based on the knowledge of those skilled in the art.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a rolling processing apparatus that can suitably carry out the rolling processing method of the present invention.
2 is a perspective view showing a rotary rest of the rolling processing apparatus of FIG. 1. FIG.
3 is a perspective view independently showing a support roller of the rotary rest of FIG. 2. FIG.
4 shows the measurement results of the uneven shape of the outer periphery of the coating rod when the coating rod is rolled using the rolling processing apparatus of FIG. 1, supported by a cemented carbide support roller. It is a figure shown in comparison with the case.
[Explanation of symbols]
10: Rolling processing device 12, 14: Rolling round die 16: Cylindrical material 30: Support roller 40: Metal core metal 42: Synthetic resin (soft material)
O ₁ , O ₂ : Rolling round die axis S: Cylindrical material axis

Claims (4)

While supporting a metal columnar material with a cylindrical support roller rotatably disposed around an axis parallel to the axis of the rolled round die between the pair of rolled round dies, In the rolling processing method of forming the predetermined ridges on the outer peripheral surface of the cylindrical material by rolling the cylindrical material between the rolling round dies and rotating it around the axis.
A rolling process method comprising performing a rolling process while supporting the columnar material using a support roller having at least an outer peripheral portion made of a soft material elastically deformed by the ridges. 2. The support roller according to claim 1, wherein a synthetic resin mainly composed of ultrahigh molecular weight polyethylene as the soft material is provided at a predetermined thickness on an outer peripheral portion of a metal core. Rolling process. The cylindrical material is fed in the axial direction while being rolled by the pair of rolling round dies, so that a spiral ridge whose height is about 5 μm to 100 μm and whose top section has an arc shape is formed. The rolling method according to claim 1 or 2, wherein a coating rod provided on the outer peripheral surface is manufactured. A pair of rolling round dies that are rotatably arranged around axes parallel to each other and perform rolling while rotating around the axis while sandwiching a metal cylindrical material,
Between the pair of rolling round dies, it is rotatably arranged around an axis substantially parallel to the axis of the rolling round die, and the cylindrical material is pressed according to the rolling load of the rolling round die. In a rolling processing apparatus that has a columnar support roller that is rotated along with the rotation of the columnar material, and forms a predetermined ridge on the outer peripheral surface of the columnar material,
The rolling apparatus is characterized in that the support roller is a metal cored bar provided with a synthetic resin mainly made of ultrahigh molecular weight polyethylene at a predetermined thickness on an outer peripheral portion thereof.

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