JPH06210437A - Production of casting product - Google Patents

Abstract

PURPOSE:To reduce the energy and time in heat treatment process by eliminating the cooling process for shaking out of a casting product. CONSTITUTION:After a casting product is cast by the metal mold having a sand core in the step S1 casting process, the casting product is not cooled in the heat treatment/shaking process, subjecting to heat treatment with making use of the remained heat of molten metal just after solidification. In this heat treatment process, shaking out of the casting product is simultaneously executed in a heat treatment furnace. Successively, the casting product is finished through the step S3 of sprue cutting process, the step S4 of inspection process and the step S5 of delivery process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a casting product, and more particularly to a method for manufacturing a casting product cast by a mold having a sand core such as an engine cylinder head.

[0002]

2. Description of the Related Art In a casting product such as an engine cylinder head, a cavity having a complicated shape such as an intake port, an exhaust port, a water jacket, etc., is provided by previously mounting a sand core inside the mold during casting. Parts are formed. When manufacturing such a casting product, a so-called sand removing step is required to discharge the sand constituting the sand core after the completion of casting.

FIG. 3 is a flow chart showing a conventional casting product manufacturing method.

First, in the casting process of step S01,
The cylinder head W is cast using the mold shown in FIG. As shown in FIG. 4, the die D has a lower die 2 having a stalk 1, and slidable core pins 3 and 4 and a slidable ejector pin 5, and is movable up and down with respect to the lower die 2. The upper die 6 and the lower die 2 and a pair of left and right slide cores 7 and 8 movable in the horizontal direction with respect to the upper die 6 are defined between the lower die 2, the upper die 6 and the slide cores 7 and 8. It is provided with a sand core 10 supported inside the cavity 9 to form an intake port, an exhaust port, a water jacket, etc., and a cylinder head W is formed by pouring a molten aluminum alloy into the cavity 9. Is cast.

In the subsequent cooling and conveying step of step S02, the cylinder head W at 400 ° C. to 500 ° C. immediately after being taken out from the mold D is cooled to room temperature while being conveyed by an overhead conveyor, and in the sand removing step of step S03, By bringing a vibrating hammer into contact with the sprue or the like of the cylinder head W, the sand forming the sand cores 10 is broken by vibration and removed from the inside of the cylinder head W. Subsequent step S0
In the sprue cutting process of No. 4, the sprue protruding from the surface of the cylinder head W is cut and removed, and in the heat treatment process of step S05, the cylinder head W is hardened and the strain is removed.
A quenching process and a tempering process are performed at a temperature of about 0 ° C. The finished state of the cylinder head W is inspected in the inspection step of step S06, and finally the cylinder head W is delivered to the next step in the delivery step of step S07.

[0006]

However, conventionally, in order to remove the sand from the cast cylinder head W, the cylinder head W is once cooled in the cooling and conveying step, and after completion of the sand removal, the cylinder head W is heated again in the heat treatment step. Therefore, there is a problem that there is much waste in terms of saving energy and time.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to eliminate the cooling step for removing sand from a cast product and save energy and time in the heat treatment step.

[0008]

In order to achieve the above object, a method for manufacturing a casting product according to the present invention is a casting process for casting a casting product with a mold having a sand core, and a casting product after the casting process. The heat treatment sand removing step of quenching and tempering the cast product, and the sprue cutting step of cutting the sprue of the cast product that has undergone the heat treatment sand removing step, and the cast product that has gone through the sprue cutting step. The first feature is that it includes an inspection step for inspecting the finish condition and a payout step for paying out a cast product that has undergone the inspection step.

The method of manufacturing a casting product according to the present invention comprises a casting step of casting the casting product with a mold having a sand core, a heat treatment step of quenching and tempering the casting product that has undergone the casting step, and a heat treatment. Sand removal process to remove sand from the cast product that has gone through the process, sprue cutting process to cut the sprue of the cast product that has gone through the sand removal process, and inspection process to inspect the finish of the cast product that has gone through the sprue cutting process A second feature is that it comprises a payout process for paying out a cast product that has gone through the process.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a flow chart of the first embodiment of the present invention.

First, in the casting step of step S1, the cylinder head W is cast using the mold D shown in FIG. In the subsequent heat treatment sand removal step of step S2, the cylinder head W
The residual heat of the molten metal immediately after solidification (400 ° C
(-500 ° C) is used to perform quenching and tempering in a heat treatment furnace, and at the same time, sand removal is performed. This sand remover is a sand core 1 in which the binder on the surface is disintegrated by the heat of the molten metal.
It is possible to perform this by vibrating the cylinder head W with a sound wave inside the heat treatment furnace.

Cylinder head W cast as described above
Since the heat treatment is performed without cooling, it is possible not only to save the energy required for the heat treatment, but also to save the time for cooling and reheating the cylinder head W. Moreover, by performing the heat treatment and the sand removal at the same time in the furnace, it is possible to further save time.

Thus, the cylinder head W is completed through the sprue cutting process of step S3, the inspection process of step S4, and the payout process of step S5.

FIG. 2 shows a flow chart of the second embodiment of the present invention.

In the first embodiment, the heat treatment and the sand removal are performed at the same time in step S2, whereas in the second embodiment, the step S2 includes the heat treatment step of step S2a and the sand removal step of step S2b. Is divided into Therefore, after heat treating the cylinder head W in step S2a, sand removal of the cylinder head W taken out of the heat treatment furnace is performed in step S2b.

Also in this embodiment, it is possible to save energy and time required for the heat treatment by performing the heat treatment without cooling the cylinder head W cast in the casting process of step S1.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various design changes can be made.

[0019]

As described above, according to the first or second feature of the present invention, the heat treatment is performed by utilizing the residual heat of the solidified molten metal as it is without cooling the cast product after casting. It is possible to save energy and time required for heat treatment of a cast product. Particularly, according to the first feature of the present invention, the heat treatment and the sand removal can be completed at the same time, so that the treatment time can be further shortened.

[Brief description of drawings]

FIG. 1 is a flowchart showing a method for manufacturing a casting product according to the first embodiment of the present invention.

FIG. 2 is a flowchart showing a method for manufacturing a casting product according to the second embodiment of the present invention.

FIG. 3 is a flowchart showing a conventional method for manufacturing a cast product.

FIG. 4 is a sectional view of a mold.

[Explanation of symbols]

 S1 Casting process S2 Heat treatment sand removal process S2a Heat treatment process S2b Sand removal process S3 Gate cutting process S4 Inspection process S5 Dispensing process D Mold W Cylinder head (cast product) 10 Sand core

Claims (2)

[Claims] 1. A casting step (S1) for casting a casting product (W) with a mold (D) having a sand core (10), and a sand removal of the casting product (W) after the casting step (S1). A heat treatment sand removing step (S2) of performing quenching and tempering of the cast product (W) and a heat treatment sand removing step (S)
2), a sprue cutting step (S3) for cutting the sprue of the cast product (W), and an inspection step (S4) for inspecting the finish of the cast product (W) that has undergone the sprue cutting step (S3),
A method of manufacturing a cast product, comprising: a payout process (S5) for paying out the cast product (W) that has undergone the inspection process (S4). 2. A casting step (S1) for casting a casting product (W) with a mold (D) having a sand core (10), and quenching of the casting product (W) after the casting step (S1). The heat treatment step (S2a) for tempering and the heat treatment step (S
2a) sand removal step (S2b) for sand removal of the cast product (W), sprue cutting step (S3) for cutting the sprue of the cast product (W) that has undergone the sand removal step (S2b), and sprue cutting Cast product comprising an inspection step (S4) for inspecting the finished condition of the cast product (W) that has undergone the step (S3) and a payout step (S5) for delivering the cast product (W) that has undergone the inspection step (S4). Manufacturing method.