JPS63230278A - Welding equipment for crankshaft - Google Patents

Abstract

PURPOSE:To eliminate slag, etc., by providing a travel frame freely movable in the axial direction of a crankshaft throw and providing supporting shafts freely movable forward and backward independently to support a shaft part and an air chipper to support a different crankshaft throw. CONSTITUTION:The crankshaft throw 3 is supported by a chuck and throw shafts to be welded are conveyed and the shaft ends are fitted to each other and the two supporting shafts 15 are raised and supported from the lower part. A wire 27 is fed and flux is lowered and the welding is performed while rotating the throw. The slag produced at the time of welding is eliminated by air jetted from the air chipper 51 and slag inclusion defects are solved. After the welding, in the case it is necessary to cut the reinforcement of weld, a cutting tool 54 is fitted and the reinforcement of weld is cut while rotating the crankshaft throw.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a welding device used for manufacturing a welded crankshaft.

(Prior art) There are two methods of manufacturing large crankshafts for ships: one is an assembly method in which the throw is shrink-fitted and connected to the journal, and the other is welding in the center of the pin or journal part. Compared to assembled type crankshafts, manufacturing of this welded type crankshaft can reduce the weight of the shrink-fitted part, making the overall weight about 20% to 30% more compact, and has high strength against torque. (R&D/Kobe Steel Technical Report, Vol. 35, No. 3, published July 1, 1985)
(See page 124 of issue).

(Problems to be Solved by the Invention) By the way, in manufacturing a welded crankshaft, the end faces of the shaft portions of the two crankshaft throws are brought together and welded while rotating. If they are not connected by welding, it is necessary to support both shafts individually, and for this reason, conventionally, two steady rest devices such as those used in lathes have been employed.

However, the space between the arms of the crankshaft throw is extremely narrow, and it is extremely difficult to insert two one-way locking devices between the arms.

Further, although it is necessary to remove slag caused by welding, since the distance between the arms is narrow as described above, no slag removal means is provided.

(Means for Solving the Problems) The present invention is a crankshaft welding device for manufacturing a welded type crankshaft, and is capable of supporting two slow shaft portions even if the shaft diameters of two crankshaft throws are different. The purpose of this technology is to provide a system that combines the functions of slag removal, flux recovery, and excess thickness cutting, and its first feature as a technical means is the use of two crank In a method for welding the end faces of the shaft portions of the crankshaft throw while butting and rotating, a traveling frame that is movable in the axial direction of the crankshaft throw is provided, and each axis of the crankshaft throw is placed at a symmetrical position on the traveling base. A pair of left and right support shafts are provided which support the crankshaft from below and are movable independently toward the center of rotation of the crankshaft throw. Another feature is that a slag peeling air chipper that blows out air in a circumferential direction toward a welded portion of the shaft portion is provided so as to be movable forward and backward.

A second feature of the technical means of the present invention is that, in addition to the first feature, a preheating burner is detachably provided in the center of the traveling platform, and furthermore, the pair of left and right A flux recovery nozzle extending horizontally and movable forward and backward with respect to the welding site is provided on one side of the support shaft, and a cutting tool that is movable forward and backward with respect to the welding site is provided on the other side. be.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 schematically shows the entire front view of the welding device according to the present invention, and in this FIG. 1, ■ is a traveling frame;
As shown in FIG. 4, the crankshaft throw 3 is movable in the axial direction on the rail 2 shown in FIG.
The bevel gear mechanism 4 has a tool engaging portion 7 formed at its shaft end.

The two crankshaft throws 3 are welded while rotating with the end faces of the opposing shaft portions 3A abutted against each other.
For this purpose, as shown in FIG. A plurality of traveling frames 1 are provided between the vehicle and the vehicle 9.

The driven support device 9 is movable, and the rotation device 8 includes a motor 10, a transmission case 11, a face plate 12, a chuck 13, etc., as shown in FIG.
With ^, the shaft part 38 of the two crankshaft throws 3 is the center of rotation 1
This is supported by 4.

Reference numeral 15 denotes a pair of left and right support shafts, which are provided at symmetrical positions on the traveling platform 1.

That is, as shown in FIG. 2, a pair of left and right mounting bases 16 are provided on the traveling frame 1, and a cylinder length is attached to the rotation center 14 of the crankshaft throw via a key 17, bolt 18, etc. at the upper end of each mounting base j6. Cylinder 19 oriented in a direction
are attached to each of the cylindrical bodies 19, and two support shafts 15 are inserted into each of the cylinders 19, and each head 15A of the support shaft 15
are arranged in parallel to support each shaft portion 38 of the crankshaft throw 3 from below, and as shown in FIGS. Engagement part 2
1 is formed.

Furthermore, the support shaft 15 has a threaded portion 15B that can be threaded as shown in FIG. It is said that

22 is a welding torch, and the head 24 of the torch arm 23 is located above the welding area 25 as shown in FIG. ing.

The torch arm 23 extends horizontally on one side of the welding area 25, and is moved up and down as welding progresses via a motor 28, etc., and its transmission system is built into the base 29. Reference numeral 30 is its encoder.

31 is a welding diameter sensor, and its sensor arm 32
The middle part of the arm 32 is attached so as to be movable up and down via a fulcrum shaft 33, and the sensor 34 at the tip of the arm 32 is biased by a spring 35 so as to come into contact with the welding part 25. A pressing cylinder 36 is provided to move the sensor 34 away from the welding site 25.

Note that the pressing operation of the cylinder 36 is linked to a differential transformer 38 via a link lever 37 and the like.

Reference numeral 39 denotes a flux compressor, which supplies the flux contained therein near the torch head 24 through a hose 4o under its own weight.

A flux collection nozzle 41 is connected to a collection hose 42 and communicated with the hopper 39, and is used to collect excess flux by suction.

The flux recovery nozzle 41 is attached to one side of the support shaft 15, as shown in FIG.

That is, the mounting bracket 43 is fixed to the cylinder body 19 with bolts or the like, and the transmission case 44 is mounted to the bracket 43.
is installed horizontally.

Two slide rods 45 are built-in and supported in the transmission case 44 as shown in FIG. A nozzle support 48 is fixed to the bearing 47.

Further, the starting force of a motor 49 can be transmitted to the feed screw 46 via a beher gear 50. Therefore, by rotating the feed screw 46 and sliding the linear bearing 47 by forward and reverse rotation of the motor 49, the nozzle is rotated. The recovery nozzle 41 can be moved horizontally forward and backward with respect to the welding site through the support.

Reference numeral 51 denotes an air chipper for removing slag, which is attached to the center of the traveling frame 1 between the pair of left and right support shafts 15, and its air nozzle 52 faces in the circumferential direction with respect to the welding area, as shown in FIG. Blowout air can be supplied via the hose 53 shown.

Although the air nozzle 52 can move forward and backward, its mechanism is the same as that of the recovery nozzle 41 (see FIG. 7), so common parts are indicated by common symbols.

Reference numeral 54 denotes a tool for cutting the extra layer, and a bracket 55 is bolted to the cylindrical body 19 of the other support shaft 15, and the bracket 55 has a slide portion 56 as shown in FIG. 10 and FIG. 1I. is formed in the horizontal direction, and a tool holder 57 is slidably fitted into this slide portion 56.

A feed screw 58 is screwed into the tool holder 57, and a cutting tool 59 is attached to the tool holder 57. Therefore, the cutting tool 59 is horizontal to the welding site and can move forward and backward.

Incidentally, this tool 54 is a portable type holder 57, etc. 60 is a preheating burner, which is mounted on the center portion of the traveling frame 1.

That is, as shown in FIG. 12, a plurality of magnets 63 are attached to a fixture 62 of a burner nozzle 61 via rotatable legs 64, and can be attached and detached via the magnets 63.

This preheating burner 60 is used for preheating before welding and for heating immediately after welding (hydrogen removal).
1 is lowered, and it is attached to this position via a magnet 63.

Note that the gas is connected to a gas supply pipe 67 via a pipe 65, a connector 66, and the like.

Next, the operation of the illustrated example will be explained.

One shaft portion 3A of the crankshaft throw 35 transported by a crane or the like is supported by the chuck 13 of the rotating device 8 as shown in FIG. It is supported by a shaft 15.

Then, the crankshaft throw 3" to be welded is sent horizontally by a crane, and the two support shafts 15 on the side opposite to the chuck (on the right in Figure 9) are lowered and supported first. After fitting the shaft end of the throw to be welded into the shaft end hole of the throw, the two support shafts 1 that had been lowered were removed.
5 and supports its shaft portion 3A'' from below.

In addition, the other shaft part of the crankshaft throw 3' to be welded is the support shaft 1 of the traveling frame 1' which is provided separately.
5' (see Figure 9).

In this way, the shaft portions 3A', 3A'' of the two crankshaft throws 3, 3'' are opposed and welded at the welding groove A, but for the purpose of torque transmission, temporary attachment between the two throws is not done. Weld.

In this case, the throws may not be directly welded to each other, but a ring B may be inserted between them as shown in FIG. 9, and the temporary welding may be performed between the throws and the rings.

After the tack welding is completed, the weld groove A is actually welded, but
At this time, a preheating burner 60 may be used to heat the material.

That is, it is also possible to lower the chipper 51 and preheat the welding site (groove) while rotating the two crankshaft throws 3 and 3 degrees.

Welding is carried out by feeding the wire 27 and dropping the flux while rotating the throws 3,3'.

The remainder of the flux at this time will fall from the welded part, but 1. It is sucked and collected through the lug 41 and returned to the hopper 39 through the hose 42.

Further, slag (welding gas) generated during welding is removed by the air blown out from the air chipper 51.

Note that the position of the air chipper 51 is determined by the welding diameter sensor 31.
This is possible by comparing the detected shaft diameter with the pulse signal of the encoder 46A (see FIG. 8) directly connected to the feed screw 46.

By removing the slag using the air chipper 51, the slag winding defect is eliminated.

As the welding progresses, from the standpoint of preventing weld cracking, an overfill is built up to have an outer diameter larger than the outer diameter of the shaft, but this overfill gets in the way of non-destructive testing performed in a subsequent process.

Therefore, after welding is completed, it is necessary to cut the excess metal, and in such a case, the cutting tool 54 is attached and the excess metal is cut as shown in FIG. 10 while rotating the crankshaft throw.

Further, even if a defect occurs during welding, the cutting tool 54 also helps to remove the defect immediately on the spot.

(Effects of the Invention) According to the first feature of the present invention, when welding the crankshaft throws, even if there are differences in shaft diameter, each can be stably supported.

It is also possible to remove slag generated during welding.

Furthermore, according to the second feature of the present invention, in addition to the above-mentioned advantages, a flux recovery function, a heating function before or after welding,
A single traveling frame can be equipped with multiple functions such as the cutting function of the excess portion, which is very useful as a welding device for crankshafts.

In addition, for the reception, Safarikun reception,
Any gas-shielded arc welding is possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the main parts of the overall structure, FIG. 2 is a front view of the traveling frame, FIG. 3 is a side view of the same, and FIG. 4 is a diagram of the entire structure including the rotating device. 5 is a front view of the welding head, FIG. 6 is a partially cutaway front view of the flux collection nozzle, FIG. 7 is a plan sectional view of the drive mechanism, and FIG. 8 is a front sectional view of the air chipper. , FIG. 9 is an explanatory diagram showing an example of crankshaft slow support during displacement, and FIG.
The figure is a front view of the reinforcement cutting tool, Figure 11 is the same side view, and Figure 1 is the same side view.
Figure 2 is a front view of the preheating burner. 1... Traveling frame, 3... Crankshaft slow, 15.
...Support shaft (part of the steadying device), 41...Franks collection nozzle, 51...Air chipper for slag removal,
54... Cutting tool, 60... Preheating burner.

Claims (1)

[Scope of Claims] 1. In a device in which the end faces of the shaft portions of two crankshaft throws are brought together and welded while rotating, a traveling base is provided that is movable in the axial direction of the crankshaft throw, and the left and right sides of the traveling base are provided. A pair of left and right support shafts are provided at symmetrical positions to support the respective shaft parts of the crankshaft throw from below and are movable independently toward the center of rotation of the crankshaft throw. A crankshaft welding device characterized in that a slag peeling air chipper that blows air in a circumferential direction toward the welded portion of the shaft portion is provided in the center of the traveling frame between the support shafts, and is movable forward and backward. 2. In a device in which the end surfaces of the shaft portions of two crankshaft throws are butt-butted and welded while rotating, a traveling base that is movable in the axial direction of the crankshaft throws is provided, and the crankshafts are placed at symmetrical positions on the traveling base. A pair of left and right support shafts are provided that support each shaft part of the throw from below and are independently movable toward the center of rotation of the crankshaft throw. A slag peeling air chipper that blows air in a circumferential direction toward the welded portion of the shaft portion is provided in the center of the frame, and is movable back and forth.
A preheating burner is provided in a detachable and fixable manner, and a flux recovery nozzle extending horizontally is provided on one side of the support shaft of the pair of left and right pairs, and is movable forward and backward with respect to the welding site. A crankshaft welding device characterized in that a cutting tool is provided that can move forward and backward.