JPS58209459A - Dust collecting method and coating lance for casting in centrifugal die casting method of wet process de lavaud type - Google Patents

Abstract

PURPOSE:To prevent the scattering of coating residues during removing said residues and to maintain the temp. on the inside surface of a die as uniformly as possible, by performing the operations of air blowing and suction respectively at both ends of the die while a coating lance is held inserted into the die. CONSTITUTION:A cast pipe is drawn and a coating lance 1 is inserted into a die up to a prescribed position in a centrifugal die casting method of a wet process de Lavaud type. Compressed air is blown immediately into the die from the flange end side thereof to remove and blow away the coating residues from the inside surface of the die; at the same time, the residues are sucked by a dust collection hood 2 provided on the spigot end side. The scattering of dust is prevented and its collection is performed surely in removing the coating residues, whereby the working environment is improved, the temp. on the inside surface of the die is maintained as uniformly as possible, and the pipe having good quality is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust collection method and a coating lance for casting in a wet process drab set mold centrifugal casting method, and its purpose is to remove coating residues in the casting method. By preventing the scattering of residue and reliably collecting dust, this system not only improves the hygiene of the working environment, but also maintains the temperature inside the mold as uniform as possible, contributing to the manufacture of high-quality pipes. The objective is to provide a dust collection method and coating lance that can be used.

The wet process drab set mold centrifugal casting method referred to in this 5 is a method that has traditionally been widely used to achieve mass production of pipes, and is roughly based on the method below. .

That is, as shown in Fig. 1, the casting machine has a mold (b) configured to be rotatable by an appropriate drive mechanism installed approximately horizontally in a water-cooling jacket (a), and inside the mold. Fully equipped with a casting machine (c) for casting molten metal as the casting raw material, a wet coating spray supply pipe inserted inside to coat the inner surface of the mold, and a spray nozzle at the tip) Then, the coating lance (E) equipped with the proximal end Gζ compressed air nozzle (E) is configured so that it can be inserted alternately into Jl:,
The lengths of the casting machine (c) and the coating lance (c) are approximately the same as the length of the mold (0).

The casting process involves moving the casting machine (c) into the mold (b) (the mold (0) is moved in the direction of axis 6), and the coating lance is inserted into the mold (b). By repeating the coating process in which the mold (b) moves in the axial direction so that the mold (b) is inserted, pipes can be continuously produced in large quantities using one mold.

Hereafter, this will be explained in further detail based on Figures 1 and 2.
To explain, as shown in Fig. 1, generally a casting machine (c)
and the end of the mold where the coating lance is inserted is opposite to the end of the mold where the product is pulled out,
In this type of casting machine, which often manufactures flanged pipes, the product is always pulled out from the end of the mold that forms the flange end, so the end of the mold from which the product is pulled out is called the flange end. The opposite mold end is called the spigot end t7
ing.

Figures 3 to 3 in Figure 2 show sea urchin, process, and process, respectively.
This is a diagram illustrating the operation of the Dorabo complete mold centrifugal casting method according to the operating order. Figure a shows the state in which the inner surface of the mold (b) has already been coated with Uni Note coating and is ready for casting. ing. 1] The figure shows the mold (B) moving toward the spigot end and the ladle (B) moving at the same time.
Fig. 0 shows a state in which molten metal (power is starting to be supplied from the casting machine (c)) from the casting machine (c). In Figures 1 and d, which show the state in which the supply of metal into the mold has begun, the mold (0) is rotated at high speed and moved toward the flange end, and the molten metal (A) is poured onto the entire inner surface of the mold. Figure 0 shows a state in which the molten metal (g) cast in the mold is solidifying in the rotating mold after casting has been completed. Figure f shows the state in which the molten metal (T) has solidified and a pipe (S) has been formed.At this time, the rotation of the mold (0) is generally stopped, but the coating process begins. In order to
Figure a shows the coating lance inserted into the mold (0) instead of Ii and moved to the position f. It shows the state in which the hair (B) is moved to the spigot end side and the pipe is pulled out, and the mold (B) is generally not rotating at this time, but Patent No. 6685
Figures 4 and 11, which may be rotating as described in the specification of No. 71, are miniatures of the state in which the pipe has been pulled out. ) to blow away the coating residue on the inside of the mold from the spigot end of the mold to the flange end and out of the mold.
After blowing, the inside of the mold is coated with a refractory powder slurry for wet coating sprayed from a spray nozzle. Figure i shows the state where the mold (b) is being rotated and moved towards the flange end side, and wet coach ink is being applied over the entire length of the mold, and figure j is , indicates the state in which the sea urchin coating work has been completed.
There is C.

After going through the following steps, the state shown in Figure 21 is restored, and one cycle of pipe manufacturing operation is completed. A single pipe is cast by moving the machine.

Incidentally, the dust collecting hood (N) indicated by a chain line in Fig. 2H will be described later.

In the wet coating drab set mold centrifugal casting method, refractory powder slurry is spray coated once each time a pipe is manufactured, so coating residue accumulates on the inside of the mold. be done. This causes the coating thickness on the inner surface of the mold to become uneven, causing defects such as outer surface dents and folds on the product casting surface, making it impossible to manufacture pipes of good quality.

To deal with this, the conventional method is to blow compressed air from the spigot end of the mold toward the flange end every time the pipe is pulled out, as described above, to scatter the coating residue inside the mold. However, the current situation is that the dust is scattered in the workplace, worsening the hygiene of the working environment.

Therefore, in order to prevent this deterioration of working environment hygiene,
Install a powerful dust collector around the workplace or install a second
As shown in Figure 11, only when the beam dust hood (nu) with J + on the inside diameter of the mold is in the state shown in the same figure, a complex process is required to position it near the flange end of the mold. A structured dust collection hood moving device is required, but the installation of these devices is not easy and there is evidence that there is a lack of feasibility1
゜Furthermore, in the process of pulling out the pipe from the mold, the pipe is pulled out sequentially from the spigot end of the mold to the flange end, so the inner temperature of the mold immediately after being pulled out is close to the spigot end side. It is lower than the flange end side, and on top of that.

Blowing with compressed air to scatter coating residue from the spigot end each time helps to make the inner surface of the mold less temperature-resistant, resulting in less coating of the inner surface of the mold during the next application. Poor drying occurs near the end of the spigot, which tends to cause pinholes and dents on the surface of the product cast in that area, which is a serious problem that makes it difficult to manufacture pipes of good quality. be.

The present invention was developed and completed in order to reliably prevent the deterioration of the working environment hygiene mentioned above and to improve the non-uniformity of the internal temperature of the mold. Immediately after the cast pipe is pulled out and the coating lance is inserted into the mold, air is blown from the flange end of the mold toward the spigot end to coat the inner surface of the mold. A wet process drab set comprising the steps of blowing off the residue, and suctioning and removing the residue with a dust collection hood provided at the base of the coating lance in close proximity to the spigot end of the mold. A dust collection method in the mold centrifugal casting method, and in order to implement this method, a dust collection hood with the suction surface facing the tip is equipped at the base, and near the base of the spray nozzle provided at the tip, The present invention relates to a coating lance for centrifugal casting of a wet process drab set, which is characterized by being equipped with a compressed air nozzle that opens toward the dust collection hood, and examples thereof are described below. Fig. 5 is a schematic diagram of a mold centrifugal casting machine with a complete set of sea urchin, process, and drum for carrying out the method of the present invention. Similarly to the first part of the figure, the pipe is shown in a state where the pipe has been pulled out, and FIG. 4 shows a detail of a part of the coaching lance taken longitudinally. The coating lance 1 has a suction surface [kI] larger than the inner diameter of the mold M, with the suction surface facing toward the tip side (in the case of the mold, the flange end side).
A dust collection hood 2 equipped with a dust collection hood 2 is installed at the base and on the line, and a compressed air nozzle 4 is installed on the uniform circumferential surface 1 of the lance 1 at the tip of the 11-piece spray nozzle 3 installed at the tip. The dust collection hood side (when it comes to the mold, the spigot end side) is equipped with an opening 11, and the lance 1 is equipped with a coating and a coating as shown in Figure 3.
A spray liquid supply pipe 5, a compressed air supply pipe 6 for operating the spray nozzle, a spray pipe 7 for atomizing the coating spray liquid, and a compressed air supply pipe 8 for blowing are inserted, and in the figure, 9 is a dust collecting duct, and 10 is a water-cooled pipe.

When not spraying, the coating/spray liquid supply pipe 5 is normally used in combination with two reciprocating pipes so that the spray liquid circulates in a circle.

In the above configuration, immediately after the cast pipe is pulled out and the coating lance l is inserted to a predetermined position, when compressed air is blown from the nozzle 4, the coating lance is removed from the inner surface of the mold and blown away. The coach ink residue thus removed is reliably sucked into the dust collection hood 2, so that it does not deteriorate the hygiene of the working environment at all. In addition, the dust collecting hood 2 is a dust collecting hood shown in FIG. Furthermore, the disadvantage of the conventional method is that immediately before blowing, the temperature inside the mold is lower than that on the fledge end. This is reliably eliminated by the compressed air that is blown from the fludge end to the spigot end, and the temperature on the inner surface of the mold can be made as uniform as possible.

Figure 5 shows an embodiment of a modified lance with a coating used in the present invention, in which a spray nozzle of a larger diameter is attached to the tip of the lance body. (' is removably attached to facilitate the installation of the spray nozzle 3, and the fitting 3' enables the connection of the h supply pipe. A tapered step 11 facing the formed dust collection hood 2 side
Since the compressed air nozzle 4 is opened on the circumferential surface I- using the It is ideal as a coating lance for casting machines for manufacturing small-diameter pipes, which are subject to shape and size constraints.

As is clear from the following explanation, according to the present invention, when removing coating residues, even if air blowing is performed, the dust can be reliably collected using the dust collection hood, and scattering of the coating residues can be prevented. Since we adopted an air blowing method from the flange end of the mold, it can significantly contribute to improving the environmental hygiene of the workplace. Therefore, it is possible to effectively prevent the above-mentioned defects from occurring on the casting surface of the product, and to produce a product of good quality.

It should be noted that the present invention can naturally be applied to a wet process drip-set mold centrifugal casting method in which the mold side is predetermined and the casting machine and coating lance side are moved, and in this case as well, the above-mentioned It is capable of fully demonstrating its various functions.

[Brief explanation of drawings]

Fig. 1 is a schematic layout explanatory diagram of a wet process drab complete mold centrifugal casting machine, and a to J in Fig. 2 are explanatory diagrams of the two-step order of casting by the casting machine, and a to e are pipes. An explanatory diagram of the formation process T, an explanatory diagram of the J-nod coating process from 1 to J, and a schematic diagram of a wet process drab complete mold centrifugal casting machine used in carrying out the present invention. FIG. 1 is a partially omitted longitudinal sectional view of another coating lance, and FIG. 5 is an enlarged sectional view of the main part showing another example of the coating lance. 1 Coating lance, 2-, I II hood,
3 spray nozzles, 4 compressed air nozzles, 1
1. Step.

Claims (1)

[Scope of Claims]: 1) In the wet process drapery set mold centrifugal casting method, immediately after the cast pipe is pulled out, when the coating lance is inserted into the mold,
Direct the air from the flange end of the mold to the spigot end.
Consisting of a step of blowing away 1k of coating residue on the inner surface of the mold, and a step of bringing the remaining iIt close to the spigot end of the mold and removing it by suction with a dust collection hood provided at the base of the coating lance. A dust collection method in a wet process Drahole set mold centrifugal casting method, which is characterized by: (2) Equipped with a dust collection hood at the base with the suction surface facing toward the tip, and a compressed air nozzle near the base of the spray nozzle at the tip. Ueno with 11 mm open toward the side [...Process drago fee ~ (Coating lance for 4-speed core casting. (3) The smooth circumferential surface of the coating lance'')
A coating lance for centrifugal casting of a set of Draho molds, characterized in that it is equipped with two compressed air nozzles. (4) A 1m step is formed on the circumferential surface of the coach lance toward the dust collection hood side, and a compressed air nozzle is provided on the circumferential surface of the step. Sea urchin described in scope item (2)] Process 1 Lab complete set Coating lance for mold centrifugal casting, 51 Coating lance spray Nozzle removal IJ g Characterized by forming a step. A coating lance for wet process Drapeau metal forming centrifugal casting according to claim (4).