JP2020049881A - Rotation support medium, rubber molding apparatus and rubber molding method - Google Patents

Abstract

To provide a rotation support medium hardly generating peeling or positional deviation from the rotation support medium of a pasting start end while securing easiness of form removal.SOLUTION: There is provided a rotation support medium 2 for pasting and winding rubber. The rotation support medium 2 has a first face 21 and a second face 22, and releasability of rubber from the first face 21 is smaller than releasability of rubber from the second face 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotary support for attaching and winding rubber, a rubber molding device, and a rubber molding method.

  As one of the steps of manufacturing a rubber product such as a tire or a component member of the rubber product, the belt-shaped rubber is extruded through an opening of a die using a rubber extruder, and the extruded band-shaped rubber is applied to the surface of the rotating support. 2. Description of the Related Art A method is known in which a rubber band is repeatedly wound around a rotary support by sticking and extruding a belt-like rubber while rotating the rotary support to form a cylindrical rubber (Patent Document 1).

  The cylindrical rubber wound around the rotating support is removed from the rotating support (hereinafter, referred to as “demolding”) and sent to the next step. At this time, it is conventionally known that the removal of the rubber from the rotary support must be performed against the adhesive force of the rubber to the rotary support, and is not easy. Recently, it has been practiced to apply a surface treatment to the rotating support to improve the releasability of rubber, thereby facilitating demolding. However, when a surface treatment for improving the releasability of the rubber is applied to the rotating support, the leading end of the rubber attached to the rotating support, that is, the starting end portion of the rubber does not adhere to the rotating support reliably, so The start end peeled off from the rotating support, or the sticking start end shifted on the rotating support. As a result, there has been a problem that the cylindrical rubber cannot be molded into a desired shape.

JP-A-11-048363

  The present invention has been devised in view of the above-described problems, and provides a rotating support that is less likely to be peeled off or displaced from the rotating support at the end of application while ensuring the ease of demolding. The purpose is to do.

The rotating support of the present invention is a rotating support for attaching and winding rubber,
The rotation support has a first surface and a second surface, and the releasability of the rubber on the first surface is smaller than the releasability of the rubber on the second surface. It is characterized by the following.

  With this configuration, it is possible to easily remove the mold from the rotating support at the end of application and to prevent the positional displacement from occurring, and to mold the cylindrical rubber into a desired shape, while ensuring the ease of demolding.

  A first method for making the releasability of the rubber on the first surface smaller than the releasability of the rubber on the second surface is as follows. Is to make the surface roughness small. For example, the first surface has an arithmetic average roughness Ra3 or less, and the second surface has an arithmetic average roughness Ra3. The first surface may be a polished surface, a plated surface, a surface on which a smooth film is provided or a surface on which a smooth coating film is formed, and the second surface may be a blasted surface. Good.

  A second method for making the releasability of the rubber on the first surface smaller than the releasability of the rubber on the second surface is as follows: the second surface is made of a rubber releasable material. Is to make it a covered surface.

  Further, the first surface may include a band-shaped region extending in a direction along a rotation axis of the rotating support, a band-shaped region extending in a direction along a circumferential direction of the rotating support, or a small region defining the entire surface of the rotating support. The regions may be arranged in a checkered pattern. When the first surface is a band-like region along the rotation axis of the rotary support, the first surface is provided on a first segment, and the second surface is provided on a second segment, The first segment and the second segment may be formed so as to be dividable.

  The rubber molding apparatus of the present invention includes the above-described rotary support, a rubber extruder that supplies rubber to be pasted, a rotary drive mechanism for the rotary support, and a positioning drive for the rotary support and / or the rubber extruder. A rubber molding device comprising a mechanism and a control unit, wherein the control unit is configured to form the rotation support, the rubber extruder, such that a start end of rubber is formed on the first surface. And controlling the rotation drive mechanism and the positioning drive mechanism.

  According to the rubber molding method of the present invention, an end portion at which the rubber is applied is formed on the rotary support.

Schematic diagram of one embodiment of a rubber molding device FIG. 2 is a view showing first and second embodiments of a rotary support according to the present invention. The figure which shows the 3rd, 4th embodiment of the rotation support body which concerns on this invention. The figure which shows the 5th, 6th embodiment of the rotation support body which concerns on this invention. Diagram of reduced diameter of some segments of the rotating support

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing one embodiment of a rubber molding apparatus for molding a cylindrical rubber. The rubber molding apparatus shown in FIG. 1 includes an extruder 1 for extruding rubber, a gear pump 10 disposed on the distal end side of the extruder 1 in the rubber extrusion direction, a die 11 disposed on a distal end side of the gear pump 10 in the rubber extrusion direction, and a rubber molded body. And a control unit (not shown). The extruder 1 includes a cylindrical barrel 1a, a hopper 1b connected to a supply port of the barrel 1a, a screw 1c for kneading and feeding a rubber material to the tip side, and a screw motor 1d for rotating and driving the screw 1c. Have. The rubber extruder can be driven and adjusted by the front-rear drive unit 14 so that the position of the rubber extruder approaches or separates from the rotary support 2. However, the present invention is not limited to this, and the rotary support 2 may be driven and adjusted back and forth so as to approach or separate from the extruder 1. In addition, the rubber molding device is configured such that the relative position of the rubber extruder in the rotation axis direction of the rotary support 2 with respect to the rotary support 2 can be drive-controlled.

  The gear pump 10 has a pair of gears 10a, and has a function of sending out the band-shaped rubber S through the band-shaped opening of the base 11 by rotating the gear 10a. The gears 10a are each driven to rotate by a gear motor 10b, and the amount of rubber to be extruded and the extrusion speed are determined by the rotation control of the gears by the control unit. In FIG. 1, the pair of gears 10a is arranged in the vertical direction in FIG. 1, but is not limited to this. For example, the pair of gears 10a may be arranged in the plane direction (the direction in which the rotation axis of the gear 10a is vertical in FIG. Good.

  The tip of the band-shaped rubber S sent from the band-shaped opening of the base 11 is attached to the rotating support 2. The rotating support 2 has on its surface at least two types of surfaces having different releasability from rubber. 2 to 4 show, for example, each embodiment of the rotary support 2 composed of two types of surfaces. Each of them has a first surface 21 (hatched region) and a second surface 22 (non-hatched region), and the releasability of the rubber on the first surface 21 is equal to that of the second surface 22. Is smaller than the releasability of rubber. The tip of the belt-shaped rubber S is attached to the first surface 21 by controlling the rotation of the rotary support 2 and the extrusion of the gear pump 10 with respect to the rotary support 2. Then, since the tip end of the attached band-shaped rubber S, that is, the end portion where the attachment starts, is on the first surface 21 having low releasability, it does not peel off or displace after being attached. In addition, since the second surface 22 has high releasability, the ease with which the rubber molded in a cylindrical shape can be removed from the rotary support 2 is ensured.

  Incidentally, there are a plurality of methods for making the releasability of the rubber on the first surface smaller than the releasability of the rubber on the second surface. The first method is a method in which the surface roughness of the first surface 21 is smaller than the surface roughness of the second surface 22. When the surface roughness is large, the total contact area of the rubber with the rotating support 2 is reduced, and the releasing force on the rubber is improved. If the surface roughness is small, the total contact area of the rubber with the rotating support 2 increases, and the releasing force on the rubber decreases. Although the definition of the surface roughness is not specified, for example, when the arithmetic average surface roughness Ra is used, the average surface roughness Ra of the first surface 21 is 3 or less, and the average of the second surface 22 is When the surface roughness Ra is more than 3, it is possible to prevent detachment or displacement of the end portion of the first surface 21 where the application is started while securing the ease of demolding. Further, the root mean square height Rq may be used, the maximum height Rz may be used, and the length Rms of the contour curve element may be used. Further, a plurality of parameters relating to the roughness may be used in combination.

  The surface treatment of the first method (a method of making the surface roughness of the first surface 21 smaller than the surface roughness of the second surface 22) will be described in detail. First, regarding the surface treatment for reducing the surface roughness of the first surface 21, the first surface 21 is polished, plated, covered with a smooth film having a small surface roughness, and a smooth coating film is formed. And the like. As a method of covering the smooth film, for example, a method of attaching a smooth film having an adhesive layer on the back surface (for example, a polyimide tape having a smooth surface) to the rotating support 2 is exemplified. A method of forming a smooth coating film includes, for example, reducing the unevenness of the surface of the rotating support 2 by spray coating. Next, as a surface treatment for increasing the surface roughness of the second surface, a method of performing a blast treatment or the like can be given. The blasting is one of processing methods excellent in practicality, and the surface of the rotating support 2 is ground and roughened by blowing a sand-like blast material onto the rotating support 2 at high speed. The material, particle size, and projection speed of the shot material are determined according to the material characteristics such as the hardness of the rotary support 2 and the degree of surface roughening. The surface treatment is applied to one of the surface treatment for reducing the surface roughness of the first surface 21 and the surface treatment for increasing the surface roughness of the second surface 22, and the other surface is applied to the other surface. It may be used untreated (the surface state when the rotating support 2 is manufactured), or may be used as a surface treatment for reducing the surface roughness of the first surface 21 and increasing the surface roughness of the second surface 22. Surface treatment may be used in combination.

  In the second method, both or one of a method of covering the first surface 21 with an adhesive material and a method of covering the second surface 22 with a release material are performed, and the adhesion or separation of the rubber due to chemical action is performed. This is a method for improving the mold power. The surface treatment of the second method will be described in detail. On the first surface 21, a tacky material containing a tacky component having a weak tackiness that does not hinder release is formed, the tackiness with rubber is increased, and the sticking start end is not peeled or displaced. To do. On the second surface 22, there is a method of forming a film of a rubber releasing material to make it easy to release the wound cylindrical rubber. These films are formed by sticking an adhesive material or a release material, spraying, dipping, plating or spraying. On the other hand, various materials such as a fluorine-based resin material such as PTFE can be used as the rubber releasing material. Either one of the method of covering the first surface 21 with the adhesive material and the method of covering the second surface 22 with the release material may be performed, or both may be performed.

  Further, while the first surface 21 is polished to reduce the releasability of the rubber with respect to the rotating support at the end of the application, the second surface 22 is covered with a fluorine-based resin material to increase the releasability. The first method described above and the second method described above may be used in combination.

  Each embodiment of the first surface 21 and the second surface 22 of the rotary support 2 will be described. The first embodiment is shown in FIG. The rotary support 2 has only one section composed of the first surface 21, and the rest is the second surface 22. In the present embodiment, it is assumed that only the sticking start end is located in the section constituted by the first surface 21. Depending on the surface treatment, only the first surface 21 having a small area may be surface-processed. Good, surface treatment is completed in a short time.

  A second embodiment is shown in FIG. In the present embodiment, the first surface 21 is a band-shaped region extending in a direction along the rotation axis c of the rotation support. When the band-shaped rubber S is added and wound, or when the adhesive force is reduced at the application position at the application start end, the application start end is placed at another position in the rotation axis c direction of the rotary support 2. You can transfer parts. Further, as shown in FIG. 2B, a plurality of band-shaped regions may be provided in the circumferential direction. When a plurality of belt-shaped regions are provided in the circumferential direction of the rotary support 2, the time for adjusting the timing of attaching the tip of the belt-shaped rubber S to the rotary support is reduced. In addition, the belt-shaped rubber S passes over the first surface 21 while being wound one turn. Then, it is possible to suppress the displacement of the band-shaped rubber S generated during the winding of the rubber to such an extent that the removal of the rubber is not hindered.

  A third embodiment is shown in FIG. In the present embodiment, the first surface 21 is a band-shaped region extending in a direction along the circumferential direction of the rotating support 2. Since the sticking start end can be formed at an arbitrary position in the circumferential direction of the rotating support, it does not take much time to adjust the timing of sticking the tip of the belt-shaped rubber S to the rotating support. In the present embodiment, the winding start portion of the belt-shaped rubber S is stuck on the first surface 21 having a low releasability in the entire circumferential direction. Is smaller than the entire area of the cylindrical rubber on the second surface 22, so that the removal of the cylindrical rubber is not hindered. A plurality of belt-like regions extending in the circumferential direction of the rotary support 2 may be provided at arbitrary positions on the rotation axis c. When a plurality of band-shaped regions are provided in the direction along the rotation axis c, the rotation support 2 can be used in the case where the band-shaped rubber S is added and wound, or when the adhesion force is reduced at the application position of the application start end. Can be moved to another position in the direction of the rotation axis c.

  A fourth embodiment is shown in FIG. In the present embodiment, the first surface 21 is arranged in a checkered pattern on a small area that divides the entire surface of the rotary support 2. As a method of dividing the entire surface of the rotating support 2 into small regions, for example, the surface may be divided into a line parallel to a line extending in the direction of the rotation axis c and a line parallel to a line extending in the circumferential direction. This embodiment has both effects of the second embodiment and the third embodiment, that is, a case where the band-shaped rubber S is added and wound, or a decrease in the adhesive force is observed at the application position of the application start end. In this case, it is possible to move the sticking start end to another position of the rotary support 2, and it does not take much time to adjust the timing at which the tip of the belt-shaped rubber S is bonded to the rotary support 2. Is obtained.

  A fifth embodiment is shown in FIG. In the present embodiment, as the position along the direction of the rotation axis c shifts on the small region that defines the entire surface of the rotary support 2, the first surface 21 also moves along the circumferential direction of the rotary support 2. It is arranged to shift. The belt-shaped rubber S can be added and wound while shifting the position in the circumferential direction of the rotating support 2 at the end of the sticking start.

  A sixth embodiment is shown in FIG. In the present embodiment, the first surfaces 21 are randomly arranged in a small area that partitions the entire surface of the rotary support. The band-shaped rubber S can be added and wound while the positions of the end portions of the sticking start are randomly arranged.

  After the belt-shaped rubber S is wound around the rotary support 2 to form a cylindrical rubber, the cylindrical rubber is removed from the rotary support 2. In the demolding, the diameter of the rotary support 2 that can be divided into a plurality of segments is reduced for each segment group, so that the cylindrical rubber is sequentially peeled off from the reduced diameter segments. This will be described in detail with reference to FIG. A cylindrical rubber C is formed on the rotary support 2. The rotary support 2 is composed of, for example, ten (first to tenth) segments in the circumferential direction. First, the odd-numbered (first, third, fifth, seventh, and ninth) segments are reduced in diameter, that is, moved to the inside of the rotary support 2 using a driving unit (not shown). The rubber adhered to the odd-numbered segments whose diameter has been reduced is peeled off from the rotary support 2. Next, the odd-numbered segments whose diameter has been reduced are returned to the original diameters, and then the even-numbered (second, fourth, sixth, eighth, and tenth) segments are reduced in diameter by using driving means (not shown). The rubber adhered to the even-numbered segments whose diameter has been reduced is peeled off from the rotating support 2. By the above operation, the entire back surface of the rubber S is easily detached from the rotary support 2. Thereafter, the cylindrical rubber C is removed from the rotating support.

  As in the second embodiment (FIG. 2B), in the case where the first surface 21 is the rotating support 2 configured by a band-shaped region extending in the direction along the rotation axis c of the rotating support, the first surface 21 The surface 21 may be provided on the first segment, and the second surface 22 may be provided on the second segment. If different surfaces with different surface treatments are arranged in the same segment, it is necessary to mask (protect) a part of the surface of the segment and apply a surface treatment to the other part. When one surface treatment corresponds to one segment so that the second surface 22 is provided in the second segment, the surface treatment may be performed on the entire surface of the segment, and there is no need to mask the surface.

  The rotating support of the present invention is only required to stick and wind rubber, and the width of the rubber does not necessarily have to be a belt shape. The rotary support of the present invention can also be applied to a case where a sheet-like rubber having a width wider than that of a belt-like rubber is wound.

  In the present invention, the "blasted surface", "polished surface", "plated surface", "surface on which a smooth film is mounted" and "surface on which a smooth coating film is formed" are all, A structure or characteristic is specified simply by indicating a state. In the case of "blasted surface", it indicates that the treated surface is in a state where local dents and cuts are irregularly generated due to the impact of the blast material, and this state indicates that other roughening The state of the processing surface caused by the means can be structurally distinguished. That is, the expression "blasted" is necessary to indicate the state of the roughened surface, and clearly specifies the structure in the invention of an object. The same applies to the “polished surface”, “plated surface”, “surface on which a smooth film is mounted”, and “surface on which a smooth coating film is formed”.

  The present invention is not limited to the above-described embodiment at all, and various improvements and modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Extruder 2 ... Rotary support body 3 ... Control device 10 ... Gear pump 11 ... Base 14 ... Front-back drive device 21 ... 1st surface 22 ... 2nd surface S ... Belt rubber

Claims (12)

A rotating support for attaching and winding rubber,
The rotating support has a first surface and a second surface, and the releasability of the rubber on the first surface is smaller than the releasability of the rubber on the second surface. A rotary support.   The rotating support according to claim 1, wherein a surface roughness of the first surface is smaller than a surface roughness of the second surface.   The rotating support according to claim 2, wherein the first surface has an arithmetic average roughness Ra3 or less, and the second surface has an arithmetic average roughness Ra3 or less.   The rotating support according to claim 2, wherein the first surface is a polished surface, a plated surface, a surface on which a smooth film is mounted, or a surface on which a smooth coating film is formed.   The rotating support according to any one of claims 2 to 4, wherein the second surface is a blasted surface.   The rotary support according to any one of claims 1 to 4, wherein the second surface is a surface covered with a rubber release material.   The rotary support according to any one of claims 1 to 6, wherein the first surface is a band-shaped region extending in a direction along a rotation axis of the rotary support.   The rotating support according to any one of claims 1 to 6, wherein the first surface is a band-shaped region extending in a direction along a circumferential direction of the rotating support.   The rotating support according to any one of claims 1 to 6, wherein the first surface is a region arranged in a checkered pattern in a small area that defines the entire surface of the rotating support.   The rotary support according to claim 7, wherein the rotary support comprises a plurality of segments that can be divided, the first surface is provided on a first segment, and the second surface is provided on a second segment. Rotating support. The rotation support according to any one of claims 1 to 10, a rubber extruder that supplies a rubber to be attached, a rotation drive mechanism of the rotation support, and the rotation support and / or the rubber extrusion. A rubber molding device having a positioning drive mechanism of the machine and a control unit,
A rubber molding device that controls the rotary support, the rubber extruder, the rotary drive mechanism, and the positioning drive mechanism so that an end of the rubber sticking start is formed on the first surface; . A rubber molding method, comprising: forming an end on which the rubber is applied on the first surface of the rotary support according to any one of claims 1 to 10.

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