JPH03264260A - Device and method for polishing inner surface of pipe - Google Patents

Abstract

PURPOSE:To polish the inner surface of various pipes having different sizes through a single device by mounting a balloon, coupled to an air passage and capable of being expanded and contracted by means of an air pressure, having an outer surface coated with an abrasive, rotated togetherwith a cylinder, and brought into contact with the inner surface of a substance to be polished to polish the inner surface. CONSTITUTION:A cylinder 2 to which balloons 3a-3c are secured is inserted in the inner surface of a substance 1 to be polished, and air is fed in the balloons through air passages 5a-5c for expansion. Through regulation of the air pressure, the air pres sure is set such that abrasives 4a-4c on the outer surfaces of the balloons 3a-3c are bought into contact with the inner surface of the substance 1 to be polished, and thereafter, by rotating the cylinder 2, the inner surface of the substance 2 to be polished is polished. Only one arbitrary balloon is selected from a plurality of the balloons 3a-3c, an air pressure is regulated, abrasives on the outer surface are brought into contact with the inner surface of the substance to be polished, and the cylinder is rotated to perform polishing for a specified time. Thereafter, the air pressure in the balloon is regulated and reduced, and a next balloon is selected to perform similar polishing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus and method for polishing the inner surface of a cylinder such as a variety of pipes and a center hole of a turbine rotor.

[Conventional technology]

Conventionally, the devices for polishing the inner surfaces of inner cylinders, pipes, etc., were stick-shaped grinders, disk-shaped grinders, etc., and these were manually inserted into the pipes for polishing, but depending on the location, grinders, etc. There were many cases where polishing was not possible because it was difficult to insert into the tube. There are also devices that mechanize these processes and polish by rotating the abrasive material on the inner surface of the cylinder, but in any case, two people are required to make adjustments, and depending on the location, the use of such fixed devices may not be possible. Currently, there are restrictions.

[Problem to be solved by the invention]

As mentioned above, conventionally when polishing the inner surface of a tube or cylinder,
The polishing pressure needs to be adjusted manually, and the accuracy of the finished surface depends on skill and experience, and there is a large difference between two individuals, and it is difficult to maintain roundness in terms of shape. Therefore, polishing by nine people was very tiring and required continuous work for a long time, and there was also work to replace the polishing material, which required a considerable amount of time.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention adjusts the air pressure by fixing a windshield coated with an abrasive material on the outer periphery of a cylinder that has an air pressure function and has a size that corresponds to the inner diameter of the surface to be polished. This is characterized in that the pin is brought into contact with the surface to be polished and rotates together with the cylinder to polish the surface to be polished. That is, the present invention consists of (1) a cylinder that is inserted into the inner surface of the tube of the object to be polished and rotates and has a passage for feeding air therein; A wind glass which can be contracted and expanded and whose outer surface is coated with an abrasive material and which rotates together with the cylinder to polish the inner surface of the object to be polished by coming into contact with the inner surface of the object to be polished; A tube inner surface polishing apparatus characterized by comprising means for adjusting feeding air pressure and means for rotationally driving the cylinder, and (2) a plurality of air passages inside the cylinder inserted into the object to be polished. It has a plurality of wind fins attached to the outer circumferential surface of the same cylinder, each coated with an abrasive material having a different roughness on its outer surface, and an adjustment means that can sequentially switch and adjust the air pressure of the plurality of wind fins. and (3) a tube inner surface polishing apparatus according to item (1), which has a plurality of passages for feeding air therein, and is inserted into the inner surface of the tube of the object to be polished and rotated. A cylinder, which is attached to the outer periphery of the cylinder and connected to the air passages, so that it can be contracted and expanded by air pressure.

The outer surface of the cylinder is coated with abrasive material and rotates together with the cylinder to come into contact with the inner surface of the object to be polished and polish the same inner surface. After inflating any one of the windshields and bringing it into contact with the inner surface to be polished and polishing by rotating the cylinder, the same windshield is contracted and then air pressure is applied to another windshield to coat it. A method for polishing the inner surface of a tube is provided, which is characterized in that rotation and polishing are carried out in contact with the polished inner surface, and polishing is carried out by sequentially switching over a plurality of wind sensors.

[Effect]

The present invention uses the above-described method to insert a cylinder on which a wind balloon is fixed into the inner surface of an object to be polished, and inflates the windshield by blowing air through the air passage. The air pressure is adjusted so that the abrasive material on the outer surface of the windshield comes into contact with the inner surface of the object to be polished, and then the cylinder is rotated to polish the inner surface of the object to be polished. Also, select any one of the plurality of windmills, adjust the air pressure, bring the abrasive material on the outer surface into contact with the inner surface of the object to be polished, rotate the cylinder, polish for a certain period of time, and then apply the air pressure. The air pressure of the windshield is adjusted and reduced, a nine-order windshield is selected, and polishing is performed in the same manner, and the windshield is switched in sequence to perform continuous polishing with abrasives of different roughness.

〔Example〕

Embodiments of the tube inner surface polishing apparatus of the present invention will be described below.

FIG. 1 is an axial cross-sectional view of a polishing apparatus showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line A--A in FIG. In Figure 1, 1 is the sample to be polished.

Reference numeral 2 denotes a cylindrical air pressure cylinder, which is connected to a nine-rotation power jig 10 and rotated by an external motor.

3a, 3b, and 3C are elastic and wear-resistant rubber balloons that use air pressure, and 3a shows the state inflated with air, and 3b and 3c show the state before inflating, respectively. 4a, 4b, 4c are rubber wind balloons 3a, 3b, 3C
The abrasive material is coated with air, and the air pressure is provided by an air pipe 5a built in a cylindrical air pressure cylinder 2.

5b, 5c using an air pressure changeover switch 6 to keep the air pressure constant.
It can be kept at c. As shown in the sectional view taken along the line A-A in FIG. 2, the air pressure is adjusted so that the abrasive material 4a coated around the wind balloon 3a is inflated by air and sufficiently contacts the inner surface of the sample to be polished. Ru. wind sen 3
a and the cylindrical air pressure cylinder 2 are connected by an air pipe 5a, and this air pipe 5a has the function of sending air to the wind flange 3a, and the function of sending air to the wind flange 3a and the cylindrical air pressure cylinder 2.
It also has the role of fixing the cylindrical air pressure cylinder-2.
The pinwheel 3a also rotates together with the rotational force of.

Also, the other wind fans 3b and 3C have the same piping 4b.

They are connected by 4C. In the case of FIG. 2, they are connected by four air pipes 5a.

It goes without saying that the wind hood 3a and the cylindrical air pressure cylinder 2 may be fixed by providing another member.

In the embodiment shown in FIG. 1, in order to perform polishing by inflating the pin 3a, the air pressure of the pins 3b and 3c is lowered to be smaller than that of the pin 3a.

Reference numeral 7 denotes a reinforcing windshield, and the windshield 3a and this reinforcing windshield 7 are used to hold a cylindrical air pressure cylinder on the inner surface of the sample to be polished. 8 is a television camera, 9 is its cable, and 10 is a rotating power jig for rotating the aforementioned cylindrical air cylinder 2.

Next, the operation of this embodiment will be explained. First, sample 1 to be polished
．． Insert the cylindrical air pressure cylinder 2 into the polishing location.

Next, settings are made for the rubber windscreen 3a in the front row. As mentioned above, the surface of the rubber wind balloon 3a is coated with the abrasive material 4a, and the air pressure changeover switch 6 is used in the air pipe 5 for sending air pressure to the rubber wind wind 3a. The rubber-like wind balloon 3a is expanded and inflated until it comes into contact with the inner surface of the tube.

After that, the air pressure is fixed at a constant pressure using the air pressure changeover switch 6. In addition, in order to inflate the reinforcing wind balloon 7 used to fix the two cylindrical air pressure cylinders 2, air is sent to the air piping 5 using the same mechanism as the rubber wind balloon 3a in the front row using an air pressure switching switch. Fix it so that it is under pressure. That is, the cylindrical air pressure cylinder 2 is fixed on the inner surface of the tube by the rubber wind tile 3a in the front row and the reinforcing wind tile 7 in the last row. The surface of this reinforcing windscreen 70 is not coated with abrasive material and is made of a material that is resistant to friction. In order to confirm the polishing position and polishing status, television cameras 8 are attached to the front row and the rear of the cylindrical air pressure cylinder 2 so that they can be supervised. The cylindrical air pressure cylinder 2 is used as a pinwheel 3a.

After fixing at step 7, the two-rotation power jig 10 is fixed to an external jig. Next, when preparations for polishing are completed, the rotary power source jig 10 is rotated and activated by the motor, thereby rotating the cylindrical air pressure cylinder 2, and applying the abrasive material 4 of the windshield 3a to the inner surface of the tube.
It can be polished with a. After polishing for a certain period of time,
The air pressure is removed and the polishing condition is observed with the television camera 8, and if it is good, the abrasive materials 4b with different roughness in the back row are sequentially removed.

Finish polishing can be carried out continuously by adjusting the distance between the 4C-coated rubber balloons 3b and 3C to the polishing surface, inflating them again, and polishing.

In this way, according to the above embodiment, the air pipes 5, 5
a, 5 b, 5 C color r-7-t-feeding'1
．． The abrasive materials 4a, 4b are coated with the air by inflating the R sensors 7, 3a, 3b, and 3C and rotating the two-cylindrical air pressure cylinder 2.

At 4C, the inner surface of the sample to be polished 1 is sequentially windshield 3a+3b,
This makes it possible to perform polishing with different roughness by switching between the 3Cs, which greatly streamlines the polishing work.

〔Effect of the invention〕

According to the tube inner surface polishing apparatus and method of the present invention described above,
Wind glass coated with an abrasive material on the surface is fixed to a cylinder equipped with air piping, and these are rotated to polish the inner surface of the pipe, and multiple wind glass are coated with abrasive materials of different roughness. Since polishing with different roughness is also possible, it is possible to switch between these and perform polishing with different roughness sequentially and continuously in the same device.

By adjusting the air pressure of the windshield, the inner surface of various pipes with different inner diameters can be polished using the same device without changing polishing jigs, etc., which greatly streamlines the polishing work.
Since it can be polished to various roughnesses, it has become possible to polish with high roundness accuracy.

[Brief explanation of drawings]

FIG. 1 is an axial sectional view of a tube inner surface polishing apparatus showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1... Sample to be polished, 2... Cylindrical air pressure cylinder 3
a, 3 b, 3 c---wind sen, 4a, 4b
. 4C...abrasive material, 5a, 5b, 5C...air piping. 6...Air pressure changeover switch, 7...Reinforcement windscreen, 10...Rotary power source jig. Figure 2

Claims (3)

[Claims] (1) A cylinder that has a passage for sending air inside and is inserted into the inner surface of the tube of the object to be polished and rotates, and is attached to the outer periphery of the cylinder and connected to the air passage so that it can be contracted and expanded by air pressure. and a windmill whose outer surface is coated with an abrasive material and rotates together with the cylinder to come in contact with the inner surface of the object to be polished and polish the same inner surface, and air is sent to the windmill through an air passage to adjust the air pressure. A tube inner surface polishing apparatus comprising: a means for rotating the cylinder; and a means for rotationally driving the cylinder. (2) A cylinder that is inserted into the object to be polished has multiple air passages inside it, and is attached to the outer circumferential surface of the cylinder, and the outer surface is coated with an abrasive material of different roughness. A tube inner surface polishing apparatus according to claim (1), characterized in that the apparatus comprises: and an adjusting means that can sequentially switch and adjust the air pressure of the plurality of wind fans. (3) A cylinder that is inserted into the inner surface of the tube of the object to be polished and rotates, having a plurality of passages for sending air into the interior, and a cylinder that is attached to the outer periphery of the cylinder and connected to each of the air passages to be compressed by air pressure. It consists of a plurality of wind-windows which are small and expandable, and whose outer surfaces are coated with an abrasive material and which rotate together with the cylinder to come into contact with the inner surface of the object to be polished and polish the same inner surface, and the plurality of wind-windows have roughness. coated with different abrasive materials, inflate any one of the windshields and bring it into contact with the inner surface to be polished, rotate the cylinder to polish the windshield, contract the same windshield, and then inflate another windshield. A method for polishing the inner surface of a tube, characterized in that air pressure is sent to the inner surface to be polished, the air pressure is rotated and polished, and the polishing is performed by sequentially switching over a plurality of wind sensors.