JPH04310361A - Numerically controlled grinding device - Google Patents

Abstract

PURPOSE:To provide a numerically controlled grinding device capable of reducing working hours time for grinding work and improving work environment while performing at the time of marking a welding line the grinding work of steel plate surface with rustproof coating applied or the weld reinforcement of a welded part in the case of butt-welding steel plates. CONSTITUTION:A carriage 5 with a grinding unit 7 mounted thereto is mounted to a truck 2 travelling along rails 1. The part, for driving a grinding belt 11, of the grinding unit 7 is formed to be turnable, and a numerical control device 8 is provided to control the travel of the truck 2, the movement of the grinding carriage 5 and the operation of the grinding unit 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerically controlled grinding device for grinding the surface of a steel plate by mounting a grinding unit on a truck and controlling the operation of the grinding unit by a numerical control device.

0002

[Prior Art] Steel plates used for structural members of bridges and hull members of ships are coated with anti-rust coating on the exposed base metal surface after removing iron oxide (black scale) adhering to the surface. alms,
Generally, marks for cutting or welding are made on the surface of this anti-rust coating. However, when welding other parts along the weld lines marked on the surface of the anti-rust coating,
Depending on the composition of the paint, defects such as blowholes may occur in the weld. For this reason, before welding other parts to the welding line, it is necessary to grind along the welding line to a predetermined width to remove the paint, and then re-mark the welding line on the exposed surface of the base metal and weld. is being carried out. To explain this work, first, a marking device is used to mark a regular weld line on the surface of the anti-rust coating, and a reference line is also marked along this weld line. Prior to welding work, a grinding device operated by an operator is used to remove the anti-rust coating from a predetermined width area including the regular weld line, and then a standard is formed on the anti-rust coating by hand. Form the welding line again using the line as a reference. After that, other members are welded along this weld line. As mentioned above, the current situation is that two unnecessary lines are drawn in order to mark one regular welding line.

On the other hand, when a plurality of steel plates are butt welded, the surfaces of these steel plates are finished flush. This work is generally performed by an operator operating a grinding device while grinding the excess portion of the weld.

[0004] As mentioned above, the work of peeling off the anti-rust coating applied to the surface of a steel plate or the work of grinding the excess of a welded part requires a motor that drives a grinding belt and a plurality of rollers that wind the grinding belt. This is done by using a hand cart equipped with a group of rollers, and an operator moving the cart while pressing a running grinding belt against the surface of the steel plate and steering it along the weld line.

[0005]

[Problems to be Solved by the Invention] As mentioned above, marking a single regular welding line on the surface of a steel plate coated with anti-rust coating involves a lot of wasted work, which increases work costs. There is a problem. In particular, when configuring a member that has a camber and requires welding flanges on the top and bottom as well as multiple stiffeners on the sides, such as the web that makes up the plate girder of a bridge, grinding work and markings are required. The amount of man-hours spent on the work is enormous.

[0006] Peeling off the anti-corrosion coating applied to the surface of the steel plate or grinding the excess part of the welded part is done manually, which requires a lot of labor and time, increases work costs, and generates dust. There are problems such as deterioration of the working environment due to In order to solve these problems, there is a need to develop an apparatus that can efficiently grind the surface of a steel plate.

An object of the present invention is to provide a numerically controlled grinding device that can efficiently grind the surface of a steel plate.

[0008]

[Means for Solving the Problems] In order to solve the above problems, a numerically controlled grinding device according to the present invention includes a cart mounted on a rail and configured to be able to run along the rail, and a cart mounted on the cart and configured to run along the rail. a grinding carriage configured to be movable in a direction orthogonal to the grinding carriage; a grinding unit mounted on the grinding carriage for grinding the surface of the steel plate; The system is constructed with a numerical control device.

In the numerically controlled grinding device, the grinding unit includes a roller group including a drive roller and an abutment roller arranged at a predetermined position on a support member, and an endless grinding belt wound around the roller group. It is preferable to have a drive motor that is supported by a grinding carriage and drives the grinding belt, and a swing drive motor that is supported by the grinding carriage and rotates the support member.

Furthermore, in the numerically controlled grinding device, a marking carriage configured to be movable in a direction orthogonal to the rail is mounted on the cart, and a marking torch for forming a score on the steel plate is mounted on the marking carriage. , it is preferable that the movement of the marking carriage and the operation of the marking torch be controlled by a numerical control device.

[0011]

[Operation] The above numerically controlled grinding device (hereinafter referred to as "NC grinding device")
), a grinding carriage configured to be movable in a direction orthogonal to the rail is mounted on a trolley configured to be able to travel along a rail, and a grinding unit is mounted on this grinding carriage, so that the trolley is configured to move in the traveling direction. , a numerical control device (hereinafter referred to as "NC device") that controls the running speed, the moving direction and speed of the grinding carriage, and the operation of the grinding unit is installed, so that the trolley and the grinding carriage can be run or moved in a predetermined direction. By operating the grinding unit, the surface of the steel plate can be ground. Therefore,
Depending on the purpose of grinding, it is possible to peel off the anti-rust coating applied to the surface of the steel plate, or to grind the excess portion of the welded part.

Further, the grinding unit is divided into a group of rollers disposed on a support member, a grinding belt wound around the group of rollers, and a drive motor supported on a grinding carriage. Since the structure is provided with a rotation drive motor for rotation, when carrying out the grinding work for peeling off the anti-rust coating on the steel plate, only the roller group disposed on the support member can be rotated and ground. Therefore, even if the weld line to be ground is a curve, it is possible to grind along the weld line.

[0013] Furthermore, when a marking carriage having a marking torch is mounted on a truck, and the moving direction and speed of the marking carriage and the operation of the marking torch are controlled by an NC device, when the truck and the marking carriage are traveling Alternatively, by operating the marking torch while moving it, predetermined marks can be formed on the steel plate. Therefore, for example, by controlling the running direction and speed of the trolley, the moving direction and speed of the grinding carriage and marking carriage, and the operation of the grinding unit and marking torch using drive commands from the NC device, grinding work and marking on the steel plate can be performed. Work can be carried out efficiently.

[0014]

[Embodiment] An embodiment of the NC grinding apparatus to which the above means is applied will be described below with reference to the drawings. FIG. 1 is a front view of the NC grinding device, FIG. 2 is a side view of the NC grinding device, and FIG. 3 is a plan view of the NC grinding device. The NC grinding device according to the present invention includes:
A grinding carriage equipped with a grinding unit is mounted on a grinding carriage configured to be able to move sideways on a cart configured to be able to run along a rail, and the following steps are taken: It is constructed with an NC device that controls the operation and rotation of the grinding unit. By using this NC grinding device, it is possible to peel off the anti-rust coating applied to the surface of the steel plate, or to grind the excess portion of the welded part where the steel plates are butt-welded.

The NC grinding device shown in the figure is constructed by mounting a grinding carriage equipped with a grinding unit and a marking carriage equipped with a marking torch so that they can move sideways on a trolley that runs along a rail. The structure is such that it is possible to selectively perform a grinding operation for peeling off the anti-rust coating and a marking operation for forming a score (hereinafter referred to as "marking"). The grinding unit is configured so that the roller group around which the grinding belt is wound can be rotated by commands from the numerical control device so that the running direction of the grinding belt always matches the direction in which the grinding is to be performed. is configured to be able to form markings such as welding lines or cutting lines on the surface of the steel plate by operating in response to commands from a numerical control device. Above NC
When marking a weld line on a steel plate with anti-rust coating using a grinding device, the process is completed by first removing the anti-rust coating using the grinding unit, and then scribing the weld line using a marking torch. It is possible to do this efficiently.

[0016] In the figure, the NC grinding device includes a cart 2 configured to be able to run along a pair of rails 1 laid in parallel, and a cart 2 configured to be able to move laterally along a cross rail 3 provided on the cart 2. The marking carriage 4 and the grinding carriage 5, the marking torch 6 mounted on the marking carriage 4, the grinding unit 7 mounted on the grinding carriage 5, the carriage 2, and the running direction and speed of each carriage 4, 5 are controlled, and marking It is composed of an NC device 8 that controls the operation of the torch 6 and the grinding unit 7. The truck 2 has substantially the same structure as a truck used in a known numerically controlled gas cutting device or marking device.

The marking carriage 4 and the grinding carriage 5 are connected by a connecting member 9, and are constructed so that by driving one of the carriages 4 or 5, the marking torch 6 and the grinding unit 7 are moved simultaneously in the same direction. There is. In this embodiment, the grinding carriage 5 is provided with a traverse motor 5a, and the marking carriage 4 and the grinding carriage 5 are configured to be able to traverse along the cross rail 3 by driving the traverse motor 5a. As described above, each carriage 4, 5 is connected to the connecting member 9.
By connecting by , it is possible to maintain the distance between the center of the marking torch 6 and the center of the grinding unit 7 at a constant value. Therefore, when moving from the current operation to another operation, it is possible to accurately align the marking torch 6 or the grinding unit 7 with the control center by driving the traverse motor 5a according to the distance. It is possible. However, it is not always necessary to use the carriages 4 and 5 in a connected manner, and it is of course possible to separate the carriages 4 and 5 and use them independently.

The marking torch 6 moves in the combined direction of the traveling of the truck 2 and the traversing of the marking carriage 4, and operates in synchronization with this movement to form a predetermined marking on the surface of the steel plate. Such marking methods include dot marking, punch marking, line marking, and the like, and each can be used in the marking device according to the present invention. In this embodiment, a so-called line marking method is used in which a marking forming material is continuously ejected from a marking torch 6 to form a marking on the surface of a steel plate.

The grinding unit 7 is operated in synchronization with the traveling of the truck 2 and the traversing of the grinding carriage 5 to remove the anti-rust coating formed on the surface of the steel plate. The grinding unit 7 is mounted on the grinding carriage 5 via an up/down device 10, and a casing 7a having a built-in turning device is fixed to an elevating bracket 10a of the up/down device 10. A drive motor 12 for driving the grinding belt 11 and a swing drive motor 13 for swinging the roller bracket 7b on which a group of rollers around which the grinding belt 11 is wound are arranged are arranged in parallel on the upper part of the casing 7a. Casing 7a
A roller bracket 7b serving as a supporting member is arranged at the lower part of the roller bracket 7b, and a roller group consisting of a drive pulley 14a, a contact wheel 14b, and a tension roller 14c is arranged at a predetermined position of the roller bracket 7b. An endless grinding belt 11 is wound around each of the rollers 14a to 14c.

A drive motor 1 is installed inside the casing 7a.
A hollow shaft and a drive shaft fitted to the hollow shaft are arranged to coincide with the axis of the shaft 2. The hollow shaft transmits the rotation of the swing drive motor 13 to the roller bracket 7b, and is rotatably supported by the casing 7a. A gear (not shown) is fixed to a predetermined position on the outer circumference of the hollow shaft, and a roller bracket 7b is fixed to the lower end. The roller bracket 7b is rotated in accordance with the rotation of the rotation drive motor 13 by meshing a gear fixed to the hollow shaft with a gear (not shown) attached to the rotation drive motor 13. The drive shaft transmits the rotation of the drive motor 12 to the drive roller 14a, and is rotatably fitted and supported inside the hollow shaft. The upper end of the drive shaft is connected to the drive motor 12 via a coupling 15, and a pulley 16a is fixed to the lower end.

A gear box 17 containing a set of miter gears is provided at a predetermined position of the roller bracket 7b. A pulley 16b is fixed to the tip of a shaft disposed parallel to the drive shaft in the gear box 17, and a drive pulley 14a is connected to the tip of a shaft disposed perpendicular to the drive shaft. A pulley 16a fixed to the lower end of the drive shaft
, a pulley 16b fixed to the shaft of the gear box 17, and a belt 16c wound around each pulley 16a, 16b. Rotation of the drive shaft is transferred to the drive pulley 14a via a miter gear.
is being communicated to. A support 14d to which a contact wheel 14b is rotatably attached and a support 14e to which a tension pulley 14c is attached via a tension mechanism 14f are fixed to the lower end of the roller bracket 7b, respectively. The outer periphery of the contact wheel 14b is covered with a material having appropriate elasticity, such as hard rubber or hard urethane, and is configured to absorb impact caused by minute irregularities on the surface of the steel plate.

The elevating device 10 is composed of an elevating bracket 10a and an air cylinder 10b for elevating and lowering the elevating bracket 10a. In particular, in grinding equipment using a grinding belt, the running speed of the grinding belt is set to high speed.
Moreover, it is necessary to increase the power, and the weight of the grinding unit 7 inevitably increases. Therefore, in the up-and-down device 10 of this embodiment, high air pressure is applied to the air cylinder 10b to hold the grinding unit 7 in the raised position, and when the grinding unit 7 is lowered, the air cylinder 10b
A relatively low air pressure is applied to the unit 7 so that the unit 7 is lowered by its own weight. When the contact wheel 14b of the grinding unit 7 comes into contact with the steel plate, by applying air pressure to the air cylinder 10b that is slightly lower than the air pressure that balances the weight of the grinding unit 7, the pressing force of the contact wheel 14b is applied to the steel plate. It is working. In the figure, 18 is a suction device for dust generated during grinding work, and the grinding belt 11
It is composed of a suction nozzle 18a arranged along the dust collecting device 18b, and a hose 18c connecting the suction nozzle 18a and the dust collecting device 18b. It starts its operation at the same time as the grinding belt 11 starts running, and sucks the dust of paint, steel plate base material, etc. ground by the grinding belt 11.

Next, a procedure for peeling off the anti-rust coating applied to the steel plate and marking the weld line using the NC grinding device configured as described above will be explained. When marking weld lines on the surface of a steel plate coated with anti-rust coating,
Prior to marking the weld line, it is necessary to peel off the anti-rust coating applied near the weld line. First, data on welding lines to be marked and data on welding lines to be ground are input into the NC device 8 using the operation panel 8a, and the operation is started. In response to a command from the NC device 8, the grinding carriage 5 moves to align the grinding unit 7 with the control center. Next, the drive motor 12 is driven, and this rotation is transmitted to the drive shaft via the coupling 15, and further transmitted to the miter gear housed in the gear box 17 via the pulleys 16a and 16b, so that the rotation direction is changed and the drive is started. It is transmitted to the pulley 14a and causes the grinding belt 11 to run. Furthermore, the up and down device 10 is driven, and the contact wheel 14
b is pressed against the steel plate. After that, by running or moving the cart 2 and the grinding carriage 5 along the welding line,
The grinding belt 11 can remove the anti-rust coating on the surface of the steel plate over a predetermined area around the weld line.

[0024] When the weld line is composed of a gentle curve, such as a flange weld in a web constituting a plate girder of a bridge, it is necessary to change the grinding direction along the weld line. In this case, when the swing drive motor 13 is driven by a command from the NC device 8, this rotation is transmitted to the hollow shaft via a gear built in the casing 7a, and the roller bracket 7b fixed to the hollow shaft is rotated.
Swirl. Thereby, each of the rollers 14a to 14c arranged on the roller bracket 7b and the grinding belt 11 rotate around the hollow shaft. By continuing the above operation, it is possible to peel off the coating corresponding to all the weld lines.

After the paint around all the welding lines has been peeled off by the above operation, the marking carriage 4 is moved in accordance with a command from the NC device 8 to align the marking torch 6 with the control center, and the marking torch 6 is aligned with the control center, and the NC device 8 By operating the marking torch 6 while traveling or moving the truck 2 and the marking carriage 4 in a predetermined direction according to the welding line data, it is possible to form a welding line marking on the steel plate.

In the above-mentioned embodiment, the case where the anti-rust coating applied to the steel plate is removed by the grinding unit 7 was explained, but the NC grinding device according to the present invention automatically grinds the excess portion of the welded part. It is also possible.

[0027]

As described above in detail, according to the NC grinding device of the present invention, it is possible to grind a predetermined area around a weld line prior to marking the weld line on a steel plate, and it is also possible to butt weld steel plates. The excess portion of the welded part can be ground. Further, when performing grinding work on the surface of a steel plate, it is possible to reduce the labor of the operator and to protect the work environment from an unfavorable working environment due to dust and the like.

Furthermore, if a marking carriage having a marking torch is mounted on the cart and the moving direction and speed of the marking carriage and the operation of the marking torch are controlled by an NC device, one device can control the surface of the steel plate. It is possible to remove anti-rust coatings and mark steel plates. Therefore, when marking a weld line on a steel plate, it is possible to perform the rust-preventive coating peeling operation and the marking operation as a continuous operation. Therefore, there is no need to form unnecessary markings as in the past, and the working time for forming weld line markings can be reduced.

[Brief explanation of drawings]

FIG. 1 is a front view of an NC grinding device.

FIG. 2 is a side view of the NC grinding device.

FIG. 3 is a plan view of the NC grinding device.

[Explanation of symbols]

1 is a rail, 2 is a trolley, 3 is a cross rail, 4 is a marking carriage, 5 is a grinding carriage, 6 is a marking torch, 7 is a grinding unit, 7a is a casing, 7b is a roller bracket, 8 is a numerical control device, 8a is a Operation board,
10 is a vertical device, 10a is a lifting bracket, 10b is an air cylinder, 11 is a grinding belt, 12 is a drive motor, 13 is a swing drive motor, 14a is a drive pulley, 14
b is a contact wheel, and 14c is a tension pulley.

Claims (3)

[Claims] 1. A cart mounted on a rail and configured to be movable along the rail; a grinding carriage mounted on the cart and configured to be movable in a direction orthogonal to the rail;
Numerical control characterized by having a grinding unit mounted on the grinding carriage for grinding the surface of the steel plate, and a numerical control device for controlling running of the cart, movement of the grinding carriage, and rotation of the grinding unit. Grinding equipment. 2. The grinding unit includes a roller group including a drive roller and an abutment roller disposed at a predetermined position on a support member, an endless grinding belt wound around the roller group, and supported by a grinding carriage. 2. The numerically controlled grinding apparatus according to claim 1, further comprising: a drive motor that drives the grinding belt; and a swing drive motor that is supported by a grinding carriage and rotates the support member. 3. A marking carriage configured to be movable in a direction orthogonal to the rail is mounted on the trolley, and a marking torch for forming a score on a steel plate is mounted on the marking carriage, and the marking carriage is moved and marked. A numerically controlled grinding device according to claim 1 or 2, wherein the operation of the torch is controlled by a numerical control device.