JPH01264752A - Grinding method and device for inner surface of curved pipe - Google Patents

Abstract

PURPOSE:To conduct the grinding processing of the inner perimeter surface of a curved pipe efficiently and automatically and also uniformly, by providing a main shaft turning mechanism whose purpose is to give a turning movement to a rotary main shaft on a slide stand and bring pressingly a rotary grinding member at its tip portion into contact with the inner perimeter surface of the curved pipe by means of a fixed pressure. CONSTITUTION:A stand drive mechanism a is operated and a slide stand 2 is moved toward a curved pipe 5 which is to be ground, and a rotary grinding member 6 at the tip of a rotary main shaft 4 in a high speed rotation is positioned within the curved pipe 5 by means of a main shaft drive mechanism b. Next, this main shaft 4 is made to make a turning movement by operating a main shaft turning mechanism c, and while the rotary grinding member 6 is brought pressingly into contact with the inner perimeter surface 5a of the curved pipe 5 by means of a fixed pressure, it is moved in the direction of its circumference, and the whole inner perimeter surface 5a of the curved pipe 5 is uniformly ground in processing by means of this grinding member 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to cast iron bent pipes (
The present invention relates to a method for mechanically polishing the inner surface of a curved pipe (elbow joint having a diameter of 75 to 300 mm) and an apparatus therefor.

[Conventional technology]

Conventionally, there was no dedicated polishing equipment, so polishing was done by hand using an electric polisher (commonly known as a hand polishing tool), but since the work involved inserting one's hand inside a curved pipe, it was extremely time consuming. It was troublesome and time-consuming, and had the drawback that it could not be mass-produced.

Furthermore, the work environment was poor because of the dust produced during the work, and the work was avoided by workers.

[Problem to be solved by the invention]

The present invention solves this problem by rotating a rotary abrasive member provided at the tip of a rotating main shaft that slides in the front-back direction in the circumferential direction while pressing against the inner surface of the curved pipe at a constant pressure. It is a technical problem to provide a method for polishing the inner surface of a curved pipe with excellent workability and an apparatus for polishing the inner surface thereof.

[Means to solve the problem]

This internal surface polishing device includes a sliding table 2 that slides in the front and back direction by a table driving mechanism a provided on a machine table 1, a support member 3 provided on this sliding table 2, and a support member 3 provided on this support member 3. A rotary main shaft 4 that rotates horizontally and vertically, a rotary abrasive member 6 that rotates while being pressed against the inner circumferential surface 5a of the curved pipe 5 by a main shaft drive mechanism provided at the tip of the main rotary shaft 4; Sliding table 2
A main spindle turning mechanism C that constantly applies a constant pressure to the rotating abrasive member 6 and gives a turning movement to the rotating main shaft 4 provided above.
and more.

[For production]

When the main shaft drive mechanism is operated, the rotary polishing member 6 rotates at high speed.

When the main shaft turning mechanism C is operated, the rotating main shaft 4 makes a turning movement.

When the table drive mechanism a is operated, the sliding table 2 slides in the direction of the curved pipe 5, and accordingly, the rotating main shaft 4 also slides in the direction of the curved pipe 5,
The rotary polishing member 6 is moved into the curved pipe 5 fixed with a jig.

Since the rotary polishing member 6 moves in the circumferential direction while being pressed against the inner circumferential surface 5a of the curved pipe 5 at a constant pressure, when the rotary abrasive member 6 rotates around the inner circumferential surface 5a, it polishes one circumference of the inner circumferential surface 5a. I will do it.

In this case, since the slide table 2 slides little by little toward the inner part of the curved pipe 5, it polishes the inner circumferential surface 5a of the curved pipe 5 from the entrance to the inner part.

In this way, the inner peripheral surface 5a of the curved pipe 5 excluding the curved portion 5
will be polished.

After polishing is completed, the sliding table 2 slides back to its original position.

Then, the bent pipe 5 is removed from the jig, set in the opposite direction, and the above operation is repeated to polish the inner circumferential surface 5a on the opposite side.

The portion of the curved portion 51) that cannot be mechanically polished is polished using an electric polisher.

〔Example〕

The table drive mechanism a uses a motor 7 as a driving force, rotates a threaded rod 8, and slides the slide table 2 in the front and back direction.
It is preferable to design the movement of the slide table 2 to match the size of the bent pipe 5, so that the slide table 2 automatically stops when it slides to a predetermined position, and then returns to the original position again.

9 is a bearing portion.

The rotating main shaft 4 is provided with a bearing sleeve 10 on the outside, and this bearing sleeve 10
A rotary abrasive member 6 is detachably provided on a rotary main shaft 4 protruding from the tip of the rotary abrasive member 6.

Although this rotary polishing member 6 is shown as a grinding wheel, it may also be a puff wheel.

An L-shaped support plate U is provided at the upper end of the support member 3 so as to be horizontally rotatable under an axle load of 1. It is rotatable.

The main shaft drive mechanism uses a motor for driving force, and this motor 3 is fixed to the rear end of the bearing sleeve 10, and this motor Z
The figure shows a case where the main rotating shaft 4 is rotated by suspending a belt ratio between the pulley n provided at the rear end of the main rotating shaft 4 and the pulley n provided at the rear end of the main rotating shaft 4.

The main shaft turning mechanism C is installed on the sliding table 2 behind the rotating main shaft 4, uses a motor Z for driving force, engages a reduction gear 14 with the gear 14 of the motor Z, and connects a rotary cover to the reduction shaft 16. 1
7, a connecting rod is provided eccentrically on the protruding surface of this rotating M17, and an air cylinder 4 with an air adjustment valve is provided on this connecting rod, and is fixed to the rotating abrasive member 6 side on this connecting rod. The figure shows a case in which the rotary main shaft 4 is given eccentric motion and rotated by pivoting the connecting rods 4 and rotating the rotary lid 17.

In the figure, 4 is a support rod, 21 is a bearing, the dark side is a rotary joint, n is a stopper, and 31 is a mounting shaft.

〔Effect of the invention〕

Since the present invention is configured as described above, the inner circumferential surface 5a of the curved pipe 5
Since the polishing can be performed mechanically, the work efficiency is greatly improved compared to the manual polishing method using a conventional electric polisher.
Since it applies uniformly to a, even if it is not a perfect circle, it can be polished evenly even if it is slightly deformed or uneven, resulting in a beautiful polished finish.

Further, the rotary polishing member 6 always applies a constant pressure to the inner circumferential surface of the curved pipe 5.
Since it is pressure-welded to a, no unreasonable load is applied to the bent pipe 5 during work, so the bent pipe 5 will not come off the jig, and there is no need to worry about dust particles during work, so the work environment can be improved. It has excellent features such as improved performance.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the apparatus, FIG. 2 is a front view of the main part, and FIG. 3 is a side sectional view showing the state of polishing a curved pipe. a... Platform drive mechanism, b... Main wheel drive mechanism, C...
Main spindle rotation mechanism, 1... Machine base, 2... Sliding base, 3...
・Supporting member, 4...Rotating main shaft, 5...Bent pipe, 5a・
...Inner peripheral surface, 6...Rotary abrasive member. April 14, 1983 Applicant: Nomizu Kikai Seisakusho Co., Ltd. Inventor: Toshiaki Takasaka Agent: Akie Yoshii Procedural amendment (voluntary) 1. Indication of the case 1988 Patent No. 92446 2. Name of the invention: Curved pipe Internal polishing method and its device 3 Relationship with the case of the person making the amendment Patent applicant Nomizu Kikai Seisakusho Co., Ltd. 4 Agent 5 Date of amendment order Showa month, day, day 6 Object of amendment ``Detailed description of the invention'' in the specification q patent
No. 1983-92446 Procedural Amendment Regarding the present application, the following portions of the specification are amended. In the fourth line of page 2, the phrase "(diameter 75-300 mm elbow joint)" has been corrected to "(elbow joint)." January 11, 1999 Applicant: Nomizu Machinery Co., Ltd. Agent: Akie Yoshii

Claims (1)

[Scope of Claims] 1. A rotary abrasive member provided at the tip of the rotary main shaft is pressed against the inner circumferential surface of the curved pipe while rotating, and a constant pressure is always applied to the rotary abrasive member while the rotary main shaft is rotated. A method for polishing the inner surface of a curved tube, which is characterized by polishing the inner peripheral surface of the curved tube by moving it forward. 2. A sliding base that slides in the front and back direction by a platform drive mechanism installed on the machine base, a support member installed on this sliding base, and a rotating main shaft that rotates horizontally and vertically provided on this support member. A rotating abrasive member that rotates while being pressed against the inner circumferential surface of the curved pipe by a main shaft drive mechanism installed at the tip of the rotating main shaft, and a rotating main shaft provided on this sliding table that constantly applies a constant pressure to the rotating abrasive member. What is claimed is: 1. An inner surface polishing device for a curved pipe, characterized in that it is equipped with a main shaft rotating mechanism that imparts rotational motion while providing rotational motion.