JP2000142558A - Cutting method for block mounting lifting piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the burning of a finish coat and allow a cutting work at a specific near distance from the base material of a hull by adopting a circular saw without any of input heat for cutting a lifting piece. SOLUTION: A cutting device is positioned in such a state as clamping the center part of a lifting piece 1 cut out with a lifting piece damp 7, Then, a lifting device 8 is operated to lower a cutting device and an electromagnet is kept in close contact with a base material 2. Thereafter, the electromagnet is activated and excited to keep the cutting device immobile. After all of the foregoing processes, a cutting circular saw blade 11 is started. As a result, two cutting circular saw blades 11 start rotation in an external opposite direction and when initial rotation reaches the specified number of revolution, the blades 11 traverses toward the lifting piece 1 as a cutting object. In this case, a cutting work is performed at a near distance of 10 mm from a base material at a constant speed. After the completion of cutting the lifting piece 1, the lifting piece clamp 7 is released and the lifting piece 1 is placed at the cutting position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial application field] In the block construction method, which is the mainstream of the current construction method for newly built ships, as the size of the hull blocks assembled on the ground increases, the lifting pieces used for lifting with cranes also increase in size and the number of It is used. The present invention relates to an efficient removal of hanging pieces in which a large amount of removal work occurs.

[0002]

2. Description of the Related Art Conventionally, there are the following methods for cutting a hanging piece. First of all, as a method often used, a used hanging piece is temporarily cut by gas cutting or plasma cutting, and then a gas cutter or arc air gouging is used to make the base material on which the hanging piece is mounted close to the base material. After the temporary cutting, the hanging piece is removed, and the final smooth finish is generally cut with an angle grinder for a grindstone. One of the recent approaches is to use a gas cutter to cut the hanging pieces by gas or by plasma cutting, and then cut the rest of the hanging pieces until the base material is bare to avoid burning the finish coating due to heat input. Or
There is also a method of shaving off with a cutting device dedicated to hanging pieces without processing with a tool that generates heat input such as arc air gouging.

[0003]

The conventional method of processing a hanging piece has the following problems. First, in the method using gas cutting or plasma cutting, burnout of the finish coating applied to the hull occurs, and a large amount of time is required for reworking the coating after the hanging piece cutting processing. In particular, the back side of the place where the hanging piece for mounting the block is attached is often a narrow place in a high place, so work is often performed on a scaffold, and the work is done in a place where the working environment is poor. Further, even in the method using a cutting device dedicated to the hanging piece, the first cutting may be gas cutting or plasma cutting, and may cause burnout. In order to avoid this, when temporarily cutting the hanging piece, a method is used in which the hanging piece is temporarily cut away from the base material to which it is mounted. It takes time.

[0004]

An object of the present invention is to solve the above-mentioned problem, and it is possible to cut without receiving heat at a position close to a base material on which a hanging piece for mounting a block is attached. An object of the present invention is to provide a method for cutting a hanging piece.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, a method of cutting a hanging piece according to the present invention employs the following method. First, the use of a circular saw blade as a cutting device is a major difference from the conventional method, but there are many technical problems in cutting using a circular saw horizontally. Since the hanging piece for mounting the block to be cut this time is attached to the hull by welding, the residual stress of the welding inside the hanging piece remains. A method is used in which the hanging piece is cut in two stages from the center in the longitudinal direction so that the circular saw blade for cutting does not get caught by the movement generated when this stress is released by cutting. In addition, by cutting using two circular saw blades in the left and right direction, unnecessary control of the circular saw blades is reduced as much as possible, thereby simplifying the structure of the apparatus, forming a structure of a rigid main part, and required for cutting. The time is also shortened.

[0006]

The two circular saw blades arranged laterally on the left and right for cutting the hanging piece each rotate in the outward direction and cut to the center in the length direction of the hanging piece. At this time, it is necessary to fix the hanging pieces with a hydraulic hanging piece clamp in order to stop the vibration of the hanging pieces, which is the biggest problem in cutting with a circular saw. In this state, the hanging piece is cut by the hanging piece cutting device at a position close to the base material.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a method of cutting a hanging piece for a hull block according to an embodiment of the present invention; FIG.
Then, the hanging piece cutting device 3 is caused to travel on the base material 2 while being operated by the operation panel 6 to be moved onto the hanging pieces 1. The traveling is performed by operating a drive device 5 composed of four electric motors 4 having independent four wheels by a pendant type operation panel 6. Hanging piece cutting device 3 for hanging piece 1 for cutting
, The stop position is finely adjusted by the operation panel 6, and the central portion of the suspension piece 1 is clamped by the hydraulic suspension piece clamp 7 provided in the central portion of the apparatus main body to position the suspension piece cutting device 3. I do.

Next, a total of four lifting and lowering devices 8 located before and after the main body are operated by the operation panel 6 to lower the hanging piece cutting device 3, and the electromagnetic magnet 10 is brought into close contact with the base material 2.
The lifting and lowering is performed by four hydraulic cylinders 9 constituting the lifting and lowering device 8 located on the driving device. When the main body of the hanging piece cutting device 3 is brought into close contact with the base material 2, the electromagnetic magnet 10 provided in the hanging piece cutting device 3 is activated to excite the base material 2 so that the hanging piece cutting device 3 does not move due to external force such as vibration. Fixed to.

After completion of the above, the cutting circular saw blade 11 is started by a push button located in the operation panel 6. Each of the two circular saw blades 11 starts rotating outward. When the number of rotations reaches the specified number of rotations from the initial start rotation, the traversing starts toward the hanging piece 1 that performs the cutting process. Circular saw blade 1
1 is driven by an electric motor 12 with a speed reducer, and is controlled so that the number of revolutions does not change. The traverse is traversed on the guide rail 13 at a constant speed by a feed screw 15 rotated by an electric motor 14, and the cutting of the hanging piece 1 is started without monitoring. When cutting is performed at a constant speed and the hanging piece 1 is cut, the circular saw blade 6 traverses to the specified distance on the traversing guide rail 13 and automatically returns to the home position. When the return is confirmed, the hanging piece clamp 7 is automatically released and the hanging piece 7 is placed at the cutting position. As described above, the cutting operation by the automatic operation of the hanging piece 1 is completed, and the end of cutting is displayed.

When the cutting of the hanging piece 1 is visually confirmed, the electromagnetic magnet 1 is moved to the next hanging piece 1.
The release of 0 is operated by the operation panel 6. Electromagnetic magnet 1
When release of 0 is confirmed, the lifting / lowering device 8 is operated to raise the hanging piece cutting device 3 and the operation is completed in a standby state in a state where the driving device 5 can be operated.

[0011]

The present invention, as can be seen from the above embodiment, is a method of forming an automatic cutting device dedicated to hanging pieces for hull blocks, and a circular saw blade which does not require heat input for cutting the hanging pieces for mounting blocks. , The work of cutting and removing the hanging piece can be facilitated. In particular, it is possible to solve a large problem of burnout of the finish coating due to heat generated when removing the hanging piece by gas cutting or plasma cutting. In addition, since the cutting method using a circular saw is cold cutting of metal and there is no heat input such as gas cutting, the cutting part of the hanging piece can be cut at a position close to the base material so that the remaining part after cutting Dramatically reduced. Therefore, the cutting operation by a cutting device dedicated to the hanging piece, which is a post-process, can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hanging piece to be cut by the present invention.

FIG. 2 is a perspective view showing a hanging piece cutting device used in the present invention.

FIG. 3 is a side view of the present invention.

FIG. 4 is a front view of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suspension piece 2 Base material 3 Suspension piece cutting device 4 Electric motor 5 Drive device 6 Operation panel 7 Suspension piece clamp 8 Lifting device 9 Hydraulic cylinder 10 Electromagnetic magnet 11 Circular saw blade 12 Electric motor 13 Guide rail 14 Electric motor 15 Feed screw

Claims (2)

[Claims] When cutting a hanging piece for lifting a hull block used at a shipbuilding site, the surface and the back side coating are not burned, and a close distance of 10 mm from a base material constituting a hull to which the hanging piece is attached is cut. The present invention relates to a method for cutting a hanging piece for mounting a block, characterized in that the hanging piece can be cut by a cutting method. 2. A method for cutting a suspension piece for a hull block, wherein a round saw blade is employed as a tool for cutting the suspension piece.