JPH0636888B2 - Manufacturing method of casting snow-melting nozzle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cast snow-melting nozzle made mainly of all-stainless steel for use in road snow-melting.

[0002]

2. Description of the Related Art In a snow-melting nozzle, a main body and a plug portion for adjusting the amount of water are provided separately to form a large opening in a water sprinkling portion to enable casting of the main body. ing.

However, since the size of the opening is limited to match the diameter of the plug, if the opening is small and the number of inner wall surfaces in the main body changes, casting cannot cope with the change in wall surface.

The present invention provides a method of manufacturing a cast snow-melting nozzle that solves this drawback.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

A casting snow-melting nozzle in which a main body portion 3 is vertically provided below a water sprinkling portion 2 having a water guiding hollow portion 1 formed therein, which is located near a peripheral wall 2'or a lower portion of the peripheral wall 2'of the water sprinkling portion 2. The snow-melting nozzle body A was divided into upper and lower parts, and a casting upper body a having a valve cylinder mounting portion 4 and a water guiding cavity portion 1 and a valve cylinder bearing portion 5 inside and a plurality of reinforcing ridges 6 outside were vertically provided. The lower casting body b and the lower casting body b are separately cast by the lost wax method, and the seam welded portions 7 and 8 formed at the lower portion of the lower casting body a and the upper portion of the lower casting body are welded to form a casting product. A method for manufacturing a snow-melting nozzle for casting, characterized in that a snow-melting nozzle body A is formed, and water sprinkling holes 9 are formed in a cast upper body a after or before the seaming welding. is there. Further, the present invention relates to the method for manufacturing a snow-making nozzle made by casting, wherein stainless steel is used as a casting material.

[0007]

When the upper casting body a and the lower casting body b are separately cast by the lost wax method, they are divided near the peripheral wall 2'having the largest diameter or the lower portion of the peripheral wall 2 '. The opening on the lower side of the casting and the opening on the upper side of the casting lower body b are also large, so that casting is easy even if there is a change in the entrance and exit of each inner wall surface, and the casting upper body a and the casting are produced by the lost wax method. Since the lower body b is cast separately, the lower body b is cast with a precision that does not require finishing work other than the thread cutting process of the valve cylinder mounting part 4 and the drilling process of the water spray holes 9.

Further, since it is easy to form the seam welded portions 7 and 8 in the divided parts, the seam welded both can be surely performed, and the cast snow-melting nozzle body A having no water leakage can be obtained. Easy to mass produce.

[0009]

EXAMPLES In the examples, for the sake of convenience in the case where stainless steel is adopted as the casting material, the casting upper body a is a stainless steel upper body a and the casting lower body b is a stainless steel lower body b.
As described below.

FIGS. 1, 2, 3 and 4 show the first embodiment, and FIGS. 5, 6, 7 and 8 show the second embodiment.

In the first embodiment, the lower part of the peripheral wall 2'is divided,
The lower end a'of the upper stainless steel body a is connected to the lower stainless steel body b.
The case where the upper end protruding portion b ′ is fitted and the welding is performed at the fitted joint is illustrated.

Further, in the second embodiment, the peripheral wall 2'of the sprinkling section 2 is used.
The figure shows a case where the groove is divided in the middle, and a case where a groove 7 is formed in the dividing portion and the existence of the groove 7 protects the seam welds 7 and 8 is shown. . The size of the snow-melting nozzle is 60 mm, 65 mm, 70
It is often divided into large, medium and small types of about mm.
At that time, it is convenient in many cases to divide the upper end protruding part b ′ into substantially the same size and to divide the stainless steel upper body a into large, medium and small. A method of manufacturing a plurality of types of snow removal nozzles by adopting the joining style of the example to prevent the lower stainless steel body b from becoming smaller, and changing the diameter of only the upper stainless steel body a in the case of medium and large types. Therefore, the present invention adopts the dividing method in consideration of this point.

Further, if one type of trial manufacture is conducted and tested to determine various conditions for casting, it becomes possible to make the right side even if the size is different, so that the mass production can be efficiently performed.

The casting process by the lost wax method of the present invention will be described in detail. Since the upper body a and the lower body b are divided into a stainless steel upper body a and a stainless steel lower body b, the upper die and the lower die of each mother die can be cut according to the design drawings. create. If the upper surface of the sprinkling section 2 is a split mold and the upper surface is flat, only the lower mold may be processed. A brazing die is formed by pushing the brazing material through an injection path provided in the mother molding die. Make a lot of this wax pattern to make a tree, spray the refractory material to the wax pattern, attach the refractory material to dry, heat in a heating furnace to melt and dewax the wax, then heat in the heating furnace Then, the refractory is fired, taken out and poured with hot water, and after cooling, the refractory is removed to obtain a product.

If the stainless steel upper body a and the stainless steel lower body b are not divided and cast as a unit by the lost wax method, it is difficult to remove the refractory from the inner concave portion where the water spray holes are formed. . If this point is divided, it becomes extremely easy to remove the refractory material. Further, when the lost wax method is adopted, finishing processing other than the processing of the screw hole of the valve cylinder mounting portion 4 that stands upright and the drilling of the sprinkling hole 9 (finish cutting processing of the inner peripheral surface and the bearing portion of the O-ring, etc.) Is almost unnecessary,
The snow-melting nozzle having a complicated internal structure can be mass-produced extremely precisely and easily.

At this time, when the stainless upper body a shown in FIG. 9 is cast by the lost wax method, as shown in FIG. 10, a cutting edge of a drill having a predetermined diameter is previously formed on the surface 10 of the stainless upper body a at a predetermined angle, for example, 45 degrees. The first drilling work of the water sprinkling hole 9 is carried out by forming the blade edge fitting concave portion 11 which is supported in a snugly fitted state and forming the facing concave portion 12 on the inner side facing the blade edge fitting concave portion 11 in the oblique direction of 45 degrees. Accurate and easy drilling is possible without wobbling.

The welding may be argon welding.

In the figure, reference numeral c is a separately manufactured valve cylinder,
Reference numeral 13 is a valve rod, 13 'is a valve hole, and the right side in FIG. 2 is a downward daruma hole shape, and the left side is a simple circular shape, and is provided so as to adjust the water spray amount by raising and lowering the valve rod 13. The valve rod 13 may be made of another material such as plastic. Reference numeral 14 is an anti-electrostatic tube made of rubber or the like that covers the casting inner peripheral surface with flexibility even if the inner peripheral surface is slightly rough. Reference numeral 15 is an O-ring,
16 is a stopper rubber stopper, 17 is a water pipe.

[0019]

As described above, the present invention is a casting snow-melting nozzle in which a main body portion is vertically provided below a water sprinkling portion having a water guiding hollow portion formed therein. In the vicinity, the snow-melting nozzle body is divided into upper and lower parts, and a casting upper body having a valve cylinder mounting portion and a water guiding cavity portion, and a casting lower body in which a plurality of reinforcing ridges are vertically provided on the inside of the valve cylinder bearing portion and on the outside. Each of them was cast separately by the lost wax method, and the seaming welds formed in the lower part of the upper part of the casting and the upper part of the lower part of the casting were welded to form the snow-melting nozzle body made of casting. Even if the entrance and exit of the wall surface is complicated, since the casting is divided into the upper casting body a and the lower casting body b, each of which has a large opening, each casting becomes extremely easy, and the wall thickness is reduced to an average to obtain the stainless steel amount. The lack of strength by saving energy by arranging reinforcing strips in the vertical direction More covers, and the casting can also be precisely manufactured from adopting the lost wax process, the more it is possible to manufacture a less costly because requires little finishing other than drilling machining screw machining and nozzle holes,
The desired snow-making nozzle made of stainless steel or cast can be accurately mass-produced by simply performing seaming welding, which is an excellent manufacturing method of the cast snow-making nozzle.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a vertical sectional front view taken along line AA of the same.

FIG. 3 is a sectional view taken along line BB of the above.

FIG. 4 is a sectional view taken along line C-C of the above.

FIG. 5 is a front view of the second embodiment.

FIG. 6 is a vertical sectional front view of the line D-D of the same.

FIG. 7 is a sectional view taken along line EE of the above.

FIG. 8 is a sectional view taken along line CC of the above.

FIG. 9 is a plan view of a cast upper body.

FIG. 10 is a plan view of a cast upper body.

[Explanation of symbols]

 1 Water-conducting hollow part 2 Water sprinkling part 2'Peripheral wall 3 Main body part 4 Valve cylinder mounting part 5 Valve cylinder support part 6 Reinforcing ridge 7 Seaming weld part 8 Seaming weld part 9 Sprinkling hole a Casting upper body b Casting lower body A Snow removal nozzle body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiki Asano 2866 Tsukioka, Sanjo City, Niigata Prefecture Asahi Metal Industry Co., Ltd.

Claims (2)

[Claims] 1. A snow-making nozzle made of cast metal, in which a main body portion is vertically provided below a water sprinkling portion in which a water guiding hollow portion is formed.
The snow-melting nozzle body is divided into upper and lower parts near the peripheral wall or the lower part of the peripheral wall of the water sprinkling part, and a cast upper body having a valve cylinder mounting part and a water guiding cavity part, and a valve cylinder bearing part inside and a plurality of reinforcing projections outside. Each of the vertically arranged casting lower body is cast separately by the lost wax method, and the seaming weld formed in the lower part of this casting upper body and the upper part of the casting lower body is welded to make the snow-casting made by casting. A method for manufacturing a cast snow-melting nozzle, characterized in that a nozzle body is formed, and a sprinkling hole is formed in a casting upper body after the seam welding or before the seam welding. 2. The method for producing a snow-making nozzle made by casting according to claim 1, wherein stainless steel is used as a casting material.