JPH10217091A - Method and device for internal surface grinding of non-magnetic material cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily grind the mirror finished surface of the internal surfaces of a cylinder at low cost. SOLUTION: The abrasive grain layer 1A of a flexible abrasive tape 1 which includes a magnetic body and in which the abrasive grain layer 1A is formed on the surface of a base material is brought in contact with the internal surface of a non-magnetic material cylinder 2, a magnet 3 is provided closely to the outer peripheral surface of the non-magnetic material cylinder 2, and the magnetic material of the abrasive tape 1 is attracted by the magnetic force of the magnet 3 so as to adhere the abrasive grain layer 1A closely to the internal surface of the non-magnetic material cylinder 2. Also the non-magnetic material cylinder 2 is rotated in the peripheral direction, and vibrated along the axial direction of the cylinder 2 so as to grind the internal surface of the non- magnetic material cylinder 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a difficult-to-cut material (such as a non-magnetic material) such as a stainless steel or a titanium material, which is applied to a piping for a transportation facility of food or a chemical, a piping for a clean room in which a high-purity fluid is circulated and the like. ) A method and apparatus for mirror polishing the inner surface of a long pipe or a small diameter cylinder.

[0002]

2. Description of the Related Art A mirror surface of an inner surface of a non-magnetic material cylinder is required to prevent deterioration due to stagnation of foods, chemicals, etc. due to protrusions of the surface roughness of the inner surface, or to use ultra-fine particles in a high-purity fluid. This is for suppressing the accumulation of dust and preventing the progress of corrosion in the pipe due to the fluid. Conventionally, as a mirror polishing method for the inner surface of a cylinder, a method of electrolytic polishing by inserting an electrode into the center axis of the cylinder, a method of grinding with a grindstone such as honing, and a method of plastic working such as burnishing with a steel ball have also been developed. I have. Further, a magnetic polishing method has been developed in which magnetic abrasive particles are inserted into the inner surface of a non-magnetic cylinder, a magnetic field is applied from the outside of the cylinder to cause a magnetic force to act on the magnetic abrasive particles, and polishing is performed by the force.

[0003]

In the method of performing electropolishing by inserting an electrode into a central axis in a cylinder, removal of electrolytic products generated during the polishing is a problem. The management of the polishing process is extremely complicated and difficult because the slight difference in components as well as the aging of the electrolytic solution as well as the material of the circular tube greatly affect the finished surface roughness. In this method, the limit value of the finished surface roughness is Ry 0.
It is about 5 μm, which is a great obstacle in terms of cost to obtain a mirror surface.

Further, in the conventional honing finish, it is difficult to apply to the inner surface polishing of a small-diameter circular tube or a long circular tube due to the restriction on the polishing mechanism. In the burnishing finish, a steel ball is pressed into a cylinder to plastically deform. However, there are drawbacks such as difficulty in application to a thin cylinder because of the finishing mechanism.

Further, the biggest weakness of the conventional magnetic polishing method is that the polishing efficiency is low, and there is also a problem that the life of the magnetic abrasive particles is short.

Accordingly, an object of the present invention is to provide a method and apparatus capable of easily performing mirror polishing of the inner surface of a cylinder at low cost.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method for forming an abrasive grain layer of a flexible polishing tape comprising a magnetic substance and having an abrasive grain layer formed on the surface of a base material. While applying to the inner surface of the cylinder, a magnet is provided close to the outer peripheral surface of the nonmagnetic cylinder, and the magnetic material applied to the polishing tape is attracted by the magnetic force of this magnet to bring the abrasive layer to the inner surface of the nonmagnetic cylinder. The inner surface of the non-magnetic cylinder is polished by bringing the non-magnetic cylinder into close contact, rotating the non-magnetic cylinder in the circumferential direction, and vibrating along the axial direction of the cylinder. Further, a mechanism for supporting the non-magnetic cylinder in a rotatable and axially oscillatable manner, and a flexible polishing tape including a magnetic substance wound on a supply spool and having an abrasive layer formed on the surface of the base material, are provided. A mechanism for inserting the abrasive layer from one end side to the other end side of the magnetic cylinder so as to be applied to the inner surface of the cylinder and winding the same on the winding spool at the other end side; While moving the magnet provided near the outer peripheral surface corresponding to the polishing tape existing position from one end of the non-magnetic cylinder to the other end at a constant speed, rotate the take-up spool to rotate the polishing tape at a predetermined index speed. Is wound, and the non-magnetic cylinder is rotated and vibrated.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, the abrasive layer 1A formed on the surface of the flexible polishing tape 1 is applied to the inner surface of the non-magnetic cylinder 2 and the outer periphery of the non-magnetic cylinder 2 A magnetic layer 1B (see FIG. 2) of the polishing tape 1 is attracted by the magnetic force of the magnet 3 to bring the abrasive grain layer 1A into close contact with the inner surface of the non-magnetic cylinder 2 so that the non-magnetic substance While rotating the cylinder 2 in the circumferential direction,
FIG. 2 shows an example in which the inner surface of the nonmagnetic cylinder 2 is polished by vibrating (oscillating) along the axial direction of the cylinder 2. In this embodiment, the polishing tape 1 which supports the nonmagnetic cylinder 2 so as to be rotatable and axially oscillatable and includes the magnetic layer 1B wound on the supply spool 10 and having the abrasive grain layer 1A formed on the surface thereof is non-magnetic. The abrasive layer 1A is inserted from one end to the other end in the magnetic cylinder 2 so as to be applied to the inner surface of the cylinder 2, and wound on the take-up spool 20 at a predetermined index speed at the other end. It is. Further, a magnet 3 is provided near the outer peripheral surface corresponding to the position where the polishing tape 1 exists in the non-magnetic cylinder 2. The magnet 3 is provided to move along the polishing tape 1 at a constant feed speed. In the illustrated example, since the inner surface of the long pipe is polished, the magnet 3 is also moved. However, if the cylinder 2 is within the length of the magnet 3, the magnet 3 does not need to be moved. In FIG. 1, the means for rotating the cylinder 2 and the means for vibrating in the axial direction are not shown, but a ring formed with a gear is fitted on the outer peripheral surface of the cylinder,
A gear device for transmitting the rotation of a motor or the like to the gear at a constant speed can be engaged and rotated. The entire rotation drive device is provided on a vibration device, and the cylinder 2 is vibrated in the axial direction while rotating. be able to. Although the means for moving the magnet 3 is not shown, the magnet 3 can be moved from one end to the other end and from the other end to the one end of the cylinder 2 by appropriately known means. Alternatively, the magnet 3 may be mounted on the endless belt around the entire circumference, and the belt may be rotated. As the magnet 3, a permanent magnet or an electromagnetic coil can be suitably used.

FIG. 2 shows a cross section of a place where the magnet 3 is provided, and the abrasive layer 1 A of the polishing tape 1 can be brought into close contact with the inner surface of the cylinder 2 by the magnetic force of the magnet 3. By rotating the cylinder 2 and vibrating in the axial direction to move the magnet 3 in the state shown in FIG.
The inner surface of the cylinder 2 can be mirror-polished. Since the polishing tape 1 has flexibility, it fits on the inner surface of the cylinder 2 having any curvature. In the method shown in FIG. 1, the polishing tape 1 is wound up at a predetermined index speed by the winding spool 20, so that the abrasive grain layer 1A of the polishing tape 1 always has a virgin surface, and
Therefore, the inner surface of the long cylinder 2 can be uniformly mirror-polished.

FIG. 3 shows an enlarged cross section of the polishing tape 1, and a tetron taffeta made of plain woven tetron filament is used as a base material 1C.
The abrasive layer 1A was formed on the substrate 1C. This abrasive grain layer 1A is formed by coating various abrasive grains on a substrate 1C with an adhesive. As the abrasive material, diamond, chromium oxide, iron oxide, alumina oxide, silicon carbide, or the like is used, and as the adhesive, acrylic, epoxy, urethane, or the like is used. For example, when a material obtained by kneading a diamond abrasive grain (particle size # 200 to # 10000) with a polyimide resin which is a high-strength and heat-resistant resin is coated on the substrate 1C by a roller coating method, it has sufficient flexibility, Extremely high abrasive holding power,
It was able to withstand a large polishing load. Also,
Silicon carbide (SiC) made of abrasive material, average abrasive grain size 20μ
When the abrasive layer 1A of m, 12 μm, and 8.7 μm is roller-coated on the base material 1C of tetron taffeta, the base material 1C made of polyester is coated with the same abrasive material at the same particle size. Also, since it has higher flexibility and cushioning properties, the contact area with the non-processed object was increased, and soft polishing could be performed. In the case of using a polyester film as the base material 1C, the primary purpose is to polish the polished surface using the uniformity of the thickness of the polyester film. It has a surface structure that uses a regular arrangement of plain weave irregularities to effectively accumulate chips from polishing in the concave portions. Polyester film substrate 1C and Tetron taffeta substrate 1
When the contact area with the non-working object with C is increased and the area is the same, the base material 1C of the polyester film makes it difficult for chips to be discharged from between the contact surfaces, and may cause clogging on the work surface. When the polishing tape 1 is wound up by the winding spool 20 as in the apparatus of the present invention, such inconvenience hardly occurs even with the substrate 1C using a polyester film. A layer containing a magnetic substance (magnetic layer 1B) is formed on the back surface of the substrate 1C. This magnetic layer 1B
Is formed by coating the back surface of the base material 1C with an adhesive mixed with a magnetic substance. Rare earths, ferrites, manganese, aluminum, magnets and the like can be suitably used as the magnetic material.

FIG. 4 shows a polishing tape 1 in which a magnetic material is dispersed in an abrasive material. The particle size of the magnetic material is smaller than the particle size of the abrasive material. The substrate 1C may be a tetron taffeta or a polyester film.

When a tetron taffeta is used as the substrate 1C, it is preferable to use a 60-75 denier tetron long fiber. If it exceeds 75 denier, the drape property is lost, and if it is less than 60 denier, there is drapability, but wrinkles are formed on the base material 1C, and if the non-processed surface is polished with the wrinkles, precise polishing is performed. The inconvenience that it is difficult to obtain occurs. When a polyester film is used as the substrate 1C, the polyester film is preferably biaxially reinforced.

The nonmagnetic cylinder 2 has an inner diameter of 20 mm and a length of 2 mm.
When polishing 00mm, the rotation speed is 300rpm,
The vibration was 300 cpm, the index speed of the polishing tape 1 was 20 mm / min, and the feed speed of the magnet 3 was 20 mm / min.
And At this time, the base material 1C of the polishing tape 1 is 7
A tetron taffeta made by plain weaving of 5 denier tetron long fiber is used.
2 μm of silicon carbide (SiC) was coated. After polishing for 10 minutes under such conditions, the inner surface of the cylinder 2 becomes R
The finished surface roughness was improved to y0.2 μm, and mirror polishing was possible.

[0015]

As described above, according to the polishing method of the present invention, since the polishing tape has flexibility, it can be fitted to any inner surface having any curvature, and mirror polishing can be easily performed at low cost. It can be carried out. Further, according to the apparatus of the present invention, the polishing tape is a long tape, and the polishing can be performed while the long polishing tape is wound on the winding spool, and the virgin surface of the polishing tape acts on the inner surface. That is, the inner surface of the cylinder can be uniformly mirror-polished. Moreover, since the polishing tape is a fixed abrasive tool, the working environment can be maintained clean.

[Brief description of the drawings]

FIG. 1 is a front view showing a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of a magnet part.

FIG. 3 is an enlarged cross-sectional view of the polishing tape.

FIG. 4 is an enlarged sectional view showing another example of the polishing tape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Abrasive tape 1A Abrasive grain layer 1B Magnetic layer 1C Base material 2 Non-magnetic cylinder 3 Magnet 10 Supply spool 20 Take-up spool

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Kitajima 782 Nishi-Itsugaru-cho, Anagoji-dori, Nakagyo-ku, Kyoto-shi, Kyoto

Claims (2)

[Claims] An abrasive layer of a flexible polishing tape containing a magnetic material and having an abrasive layer formed on the surface of a substrate is applied to the inner surface of the non-magnetic cylinder and the outer peripheral surface of the non-magnetic cylinder A magnet is provided in close proximity to the magnetic material applied to the polishing tape by the magnetic force of the magnet to bring the abrasive layer into close contact with the inner surface of the nonmagnetic cylinder, and rotate the nonmagnetic cylinder in the circumferential direction, A method for polishing the inner surface of a non-magnetic cylinder, wherein the inner surface of the non-magnetic cylinder is polished by vibrating along the axial direction of the cylinder. 2. A mechanism for supporting a non-magnetic cylinder in a rotatable and axially oscillatable manner, and a flexible polishing apparatus including a magnetic substance wound on a supply spool and having an abrasive layer formed on the surface of a base material. A mechanism for inserting the tape from one end side to the other end side of the non-magnetic body cylinder so that the abrasive layer is applied to the inner surface of the cylinder and winding the tape on a take-up spool at the other end side; Rotate the take-up spool while moving the magnet provided near the outer peripheral surface corresponding to the position of the polishing tape in the cylinder from one end of the non-magnetic cylinder to the other end at a predetermined index speed. An inner surface polishing apparatus for a non-magnetic cylinder, wherein the polishing tape is wound up and the non-magnetic cylinder is rotated and vibrated.