JPH01233065A - Manufacture of metal made solid - Google Patents

Abstract

PURPOSE:To obtain a metal made solid with good accuracy, extremely high strength and excellent heat resistance by stacking a bead further on the bead formed by moving a welding torch by profiling to the sectional shape of an automating shape body and repeating this process. CONSTITUTION:The substrate 2 earthed along the bottom face of a container 1 is arranged and the flux 3 for welding in a sand shape is spread uniformly in the necessary thickness on said substrate 2. The torch 10 at the tip of a welding robot 9 is inserted into the flux 3, discharged in the space with the substrate 2 and a bead 12 is formed on the substrate 2 by melting a welding wire 11. The flux 3 is then spread so as to cover it on the bead 12 by an automatic scraper 8. The torch 10 tip is thereafter inserted in to the newly spread flux 3 and a bead 13 is newly formed on the bead 12. The aim-shape body is formed as the laminating body of the beads 12, 13... by repeating this series process. As a result the obtd. forming body, i.e., a metal made solid has less contraction at its hardening time and a good accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of stacking weld beads to form a metal solid.

[Prior Art] A light curable fluid material is irradiated with a light beam to harden the irradiated portion, and this hardened portion is made to continue in the horizontal direction, and a photo curable fluid material is further supplied above the irradiated portion to perform the same process. By curing it, the cured product is continuous in the vertical direction,
An optical modeling method for manufacturing a cured body with a desired shape by repeating this process is disclosed in Japanese Patent Application Laid-Open No. 60-247515, 62-3.
It is publicly known from No. 5966, No. 62-101408, etc. In addition, light is irradiated through a modeling mask having a slit corresponding to one cross section of the cured product in the desired shape to cure the material, and then an uncured photocurable fluid material is placed on the cured layer and the material is used for modeling. There is also an optical modeling method in which a cured product with the desired shape is manufactured by replacing the mask with one having a slit corresponding to one cross section adjacent to the height direction of the cured product with the desired shape and repeating the process of irradiating light again. It is publicly known (for example, the above-mentioned Japanese Patent Application Laid-Open No. 62-35966).

[Problems to be Solved by the Invention] According to the above-mentioned modeling method using the photocurable fluid material, it is possible to manufacture hollow bodies etc. that cannot be manufactured by casting methods, but on the other hand, there are the following problems to be solved. do.

(a) Photocurable fluid materials are generally extremely expensive.

(b) The cured product of the photocurable fluid material has low strength.

(c) The photocurable fluid material shrinks significantly during curing, resulting in cracks and large errors in the dimensions of the cured product.

[Means for Solving the Problems] The method for manufacturing a metal three-dimensional object of the present invention involves moving a welding torch to follow the cross-sectional shape of a target object to form a bead with the cross-sectional shape, and further forming a bead on the bead. By stacking beads and repeating this process, a three-dimensional metal object of the desired shape is manufactured.

[Operation] By continuously moving the welding torch to follow the cross-sectional shape of the object, a bead having a shape that follows the cross-sectional shape is formed. By stacking these beads one after another, the desired shape can be formed as a stack of thin cross-sections such as so-called ring slices. Since this solid body is made of welded metal, it has extremely high strength and good dimensional accuracy.

[Examples] Examples will be described below with reference to the drawings. 1st~
FIG. 4 is a side view showing the embodiment method.

In the wooden embodiment method, first, as shown in Fig. 1, a grounded substrate 2 is placed along the bottom of the container 1, and a sand-like welding flux 3 is spread on the substrate 2 to the required thickness and spread evenly. vinegar. In order to level the flux 3, an automatic scraper 8 is used which includes a hopper 4, a feeder 5, a leveling plate 6, and a robot device 7 that supports these via an arm 7a.

That is, the hopper 4 and the feeder 5 are positioned at the left end in FIG. 1, and while the feeder 5 is supplying the flux 3, the hopper 4 and the feeder 5 are advanced to the right in FIG. Spread it evenly to the required thickness.

Next, as shown in FIG. 2, the torch 10 at the tip of the welding robot 9 is inserted into the evenly spread flux 3.
An electric discharge is generated between the welding wire 11 and the substrate 2 to melt the welding wire 11 and form a bead 12 (see FIG. 3.4) on the substrate 2. At this time, the operation of the welding robot 9 is controlled so that the welding robot 9 moves along a portion corresponding to the bottom surface of the target shaped object. As a result of this operation, a welding bead 12 (metal obtained by melting the welding wire 11 and cooling and solidifying the welding wire 11) is formed on the substrate 2 along the bottom surface of the target shape.

In FIG. 2, reference numeral 9a indicates an arm of the welding robot, and 9b indicates a take-up reel for the welding wire 11.

Next, the flux 3 is spread on the bead 12 using an automatic scraper 8 so as to cover it. In this case, before operating the automatic scraper, it is preferable to take out the melted and solidified flux from inside the container 1 or collect it in a corner of the container 1 where it will not interfere with modeling.

After that, insert the tip of the torch 10 into this newly spread flux and apply the heat 1 formed earlier.
A new bead 13 (see figure i3.4) is formed on top of the bead 2. At this time, so that the bead i.13 is formed following the horizontal cross-sectional shape adjacent to the upper side of the bottom surface of the target shaped body,
The torch 10 is moved by the welding robot 9.

By repeating this series of steps, the desired shape is formed as a stack of beads 12, 13, . . . . Figure 3.4 shows that after forming six layers of beads 12 to 17, the seventh
This shows the state in which a layer of beads is formed. In FIG. 3, the flux 3 is spread evenly on the upper side of the sixth layer bead 17 by an automatic scraper 8, and in FIG.
The seventh layer of beads is about to be formed.

After the beads 12, 13, .

In the above-mentioned series of steps, control of the movement of the torch 10 on the welding robot 9 in the horizontal plane, movement control of shifting the torch 10 upward one step at a time, feeding control of the welding wire 11, and setting of current and voltage conditions are performed. , the welding speed is set by a computer (as shown). Further, the operation of the automatic scraper 8 is also controlled by the computer in synchronization with the m480 scrapers 8) to 9.

In addition, on the wood layer side, a submerged arc welding process using sand-like welding flux 3 is used, and in this way, the deviation can be prevented from oxidizing the beads 12, 13, . . . . Furthermore, by supporting the side surfaces and lower surfaces of the beads 1-12, 13, . . . with the flux 3, dripping of the molten metal can be prevented, and the dimensional accuracy of the target shaped body can be improved.

The present invention may adopt the following embodiments.

(a) If the risk of oxidation of the bead or dripping of molten metal is small, gas shield welding can be used.

(b) Use pulsed welding current to prevent excessive penetration.

(c) Improving the modeling accuracy by reducing the welding current, reducing the wire diameter, and reducing the thickness of the beads 12, 13, . . .

(d) Perform welding and oscillation operations on the welding torch.

In the present invention, any metal or alloy that can be electrically welded such as iron, copper, or aluminum can be used as the metal.

[Effects] As described above, according to the method of the present invention, a target-shaped object can be formed using an inexpensive metal material. The resulting shaped body exhibits little shrinkage during curing and has good precision, extremely high strength, and excellent heat resistance. This molded body can be used as a mold matrix for mold production, copying, etc.

[Brief explanation of the drawing]

1, 2, 3, and 4 are side views illustrating an embodiment of the method of the present invention. 1... Container, 3... Flux, 6.
・・Leveling board, 8・Automatic scraper, 9・
...Welding robot, 10...Torch, 12-17
···bead.

Claims (1)

[Claims] A metal in which a welding torch is moved to follow the cross-sectional shape of a target-shaped body to form a bead with the cross-sectional shape, further beads are stacked on top of the bead, and this process is repeated to produce a metal three-dimensional body with the target shape. Manufacturing method of solid body.