KR20010001424A - Producing method of press public law for receptacle - Google Patents

Abstract

PURPOSE: A manufacturing method of cook utensil is useful for reducing production processes, saving installation costs and increasing the production of utensils by means of hot forging work, particularly, press forging method. CONSTITUTION: A method for manufacturing cook utensil is accomplished by using a forging work. The forging work is performed by applying and tempering compressive force or impact force to metal materials. In a first step of the forging work, a source material is heated to about 600 deg.C. In a second step, the heated material is impacted by forging presses divided into top and bottom metallic patterns and become reduced its thickness. The processed cook utensil has a sill (23) at the bottom side and a flange (21) having desired thickness along its outer edge.

Description

Producing method of press public law for receptacle}

The present invention relates to a method of manufacturing a cooking vessel through a hot forging method, and more particularly, to manufacture a variety of cooking containers such as a frying pan, pot, etc. by using a hot forging to simplify the manufacturing process and increase the production volume To achieve this.

In general, the cooking vessel is to cook food by the heat conduction of the heat source, it is manufactured using a metal material for heat conductivity and maintenance.

The metal used in the cooking vessel used general steel (steel) in the initial stage of manufacturing, and had a disadvantage of being easily corroded due to foods in which salt and moisture were continuously acting.

Thus, in recent years, a cooking vessel using aluminum alloy having the lowest specific gravity and excellent thermal conductivity as one of nonferrous metals has been produced.

In the production of a cooking vessel using the aluminum alloy, a drawing method through a pressing process or a casting (casting), which is one example of casting to melt a material and manufacture in a predetermined mold, is common.

The drawing method through the pressing process is a method of manufacturing a plate-like material by applying a constant pressing force using a mold having the same shape as the outer shape of the cooking vessel,

Mass production is possible, and the produced product is characterized by uniform thickness of the bottom, side and edges.

However, if the thickness of the entire part including the bottom surface of the cooking vessel is uniform, the following problems occur,

First, if the overall thickness is formed on the basis of the thickness of the side and edge irrelevant to the action of the heat source, if the bottom part is thin due to the nature of the cooking operation, the food burns before ripening.

On the contrary, when the cooking container is manufactured based on the thickness of the bottom surface, the thickness of the side and the edge portion becomes thicker than necessary, which increases the overall weight and increases the consumption of materials, thereby increasing the production cost.

Thus, by supplementing the drawbacks of the drawing by pressing as described above, the thickness of the bottom, side, and rim of the cooking vessel is formed differently to improve cooking performance, reduce weight, and reduce material,

In order to achieve this purpose, one of the casting methods, a gravity casting process was used.

The gravity casting is produced by injecting metal in a molten state between the phases by using a mold of a specific shape and then cooling it. The shape and properties of the manufactured product are determined according to the shape of the mold.

Such gravity casting is easy to form different thickness of the bottom surface and side and the edge of the cooking vessel,

For example, assuming that the thickness t1 of the bottom surface 10 is 5 mm, as shown in FIG. 1,

The thickness t2 of the bottom surface 10 and the lateral surface 11 that follows is thinned to about 4 mm, and then the rim 12 which increases the overall height h of the cooking vessel 1 to prevent invasion of the contents is It becomes thin again by about 3mm.

As described above, the thicknesses t1, t2, and t3 of the bottom surface 10, the side surfaces 11, and the edges 12 constituting the cooking container 1 are gradually reduced to increase the thermal conductivity efficiency and the waste of raw materials. It is to prevent the cost increase.

As described above, the cooking vessel having different thicknesses of the bottom, side, and edges by gravity casting is easy to set the optimum situation for cooking.

However, gravity casting caused bubbles in the internal structure, which is a fatal drawback of casting, and caused bubbles to disperse due to non-uniform coating surface during the coating work at high temperature (about 400 ℃).

In addition, the gravity casting has a huge manufacturing process, a huge initial equipment cost is required, due to the characteristics of the manufacturing process, mass production is impossible, and there are problems such as increased processing and labor costs for post-treatment.

Accordingly, the present invention has been made to solve the above-mentioned problems, and the purpose is to simplify the production process and increase the initial cost of production and production while the overall thickness is different by making the cooking vessel by hot forging.

1 is a cross-sectional view showing an example of a cooking vessel manufactured by the prior art gravity casting,

Figure 2 is a cross-sectional view showing a manufacturing state of the cooking vessel to which the present invention is applied step by step,

Figure 3 is a partially broken perspective view showing a cooking vessel manufactured by the inventors hot forging.

* Description of the symbols used in the main parts of the drawings *

2; cooking vessel

20; bottom surface

21; borders

22; side

23; step

24; end

Hereinafter, a manufacturing process and an operational state of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing a step by step manufacturing state of the cooking vessel to which the present invention is applied, Figure 3 will be described together with a partial wave perspective view showing the cooking vessel manufactured by the inventors hot forging.

The method of manufacturing a cooking vessel using the hot forging method of the present invention is to form a metal material through annealing by compressive force or impact force in a state of easy plastic flow,

Since most metal materials are fired at high temperatures and are easy to process, it is common to heat materials to be forged at high temperatures.

It is called hot forging to heat the metal material to be forged and then perform the work.

It is divided into hammer forging, press forging, upset forging, and roll forging.

Among the various hot forging methods as described above, the forging method suitable for forming the cooking vessel to which the present invention belongs is press forging,

The press forging is widely used in the processing of nonferrous metals and has the advantage of being very easy to work because the outer shape of the product is molded in one stroke.

The manufacturing process of the cooking vessel using the press forging as described above is produced through the process of mold production → hot heating → pressing → post processing.

The mold is divided into upper and lower molds, and the upper mold is fixed to the crank mechanism for repeating the up and down reciprocating motion by the cam of the press, and the lower mold is mounted on the die bed.

When the mold production is completed as described above, the raw material in the form of a roll or a plate is cut into a predetermined dimension so as to conform to the standards of the cooking vessel, and is heated in a state of easy firing to form a state of easy firing, and then heated. Material is placed on the lower mold mounted to the press die bed.

For reference, a typical firing temperature of the aluminum is about 600 ℃.

As described above, the aluminum material placed on the lower mold is subjected to a pressing process of forming an outer shape of the cooking vessel by pressing the upper mold mounted on the crank mechanism of the press.

The cooking vessel 2 produced by the pressing process is a finished product through a post-processing process to remove the sharp portion of the bottom surface 20 or the edge 21.

The cooking vessel produced through the manufacturing process as described above, such that the overall thickness (t4, t5, t6) from the bottom surface 20 to the side edge 22 and the edge 21 of the front end gradually decreases as shown in FIG. To configure,

The upper mold is pressurized by the material of the heating state as shown in Fig. 2 a) placed in the lower mold is b) the shape change by the ductility along the space formed between the mold phase, such as the shape is formed to form an intermediate process,

When the overall pressure of the press acts on the upper mold under pressure as described above, the same shape as that of the finished product as in the form c) is formed, and the shape change due to ductility is completed.

The cooking vessel manufactured by hot forging as described above to form a step 23 on the bottom surface 20, as shown in Figure 3 formed thicker than the side 22 and the edge 21,

The edge portion 21 is provided with an end portion 24 having a predetermined thickness for easy handling of the cooking vessel 2 and beautiful appearance.

As described above, the stepped portion 23 and the end portion 24 of the edge portion 21 formed on the bottom portion 20 cannot be formed in a conventional drawing process or gravity casting.

This is because it is impossible to form a deviation of the thickness in the drawing process, the gravity casting process is a problem that the amount of a separate mold and molten metal must be increased in order to generate the step and end.

Even though the hot forging die is manufactured in a form considering fatigue and impact load by using a material having excellent impact resistance, it is cheaper to manufacture than the metal mold required for conventional gravity casting, and the replacement time is extended due to longer service life. To reduce the maintenance cost.

In addition, the manufacturing method through the hot forging can produce the heated material in one stroke by pressing, so that the production time is drastically shortened compared to the gravity casting, which increases the output and simplifies the processing process for post-treatment. Induce savings.

Since the cooking vessel manufactured by the hot forging has a dense internal structure, there is no fear of bubble generation, and even after coating (coating) work performed at a high temperature, a uniform coating surface may be induced to improve quality.

The method of manufacturing a cooking vessel using the hot forging method of the present invention as described above is a useful invention that can increase production through the simplification of the production process and can reduce production costs and thus can occupy a comparative advantage in price competition.

Claims (2)

In the manufacturing method of the cooking vessel using the forging method to apply the compressive force or impact force to the metal material; The material cut to a certain dimension is heated to about 600 ℃ which is easy to fire, The heated material is gradually reduced in overall thickness (t4, t5, t6) from the bottom surface 20 to the side 22 and the edge 21 of the tip by the impact force of the press separated into upper and lower molds. Method for producing a cooking vessel using a hot forging method, characterized in that forming. The cooking vessel 2 manufactured by using the hot forging is characterized in that the step 23 is integrally formed on the bottom surface 20, and the edge 21 has an end 24 having a predetermined thickness. Cooking vessel using forging method.