JPH08318362A - Die device for casting - Google Patents

Abstract

PURPOSE: To execute the solidification with directivity of molten metal without using a cooling means and to simplify a casting device by constituting a casting space with plural dies made of materials different from each other. CONSTITUTION: The casting device S used for forming a wheel for vehicle is supported with a base 10 and d has the casting space 50 formed by assembling a lower die 20, one pair of side dies 30 and an upper die 40. The lower die 20 is constituted of e.g. a die-steel made lower die insert 21 at the central part and a carbon steel or cast iron-made first annular lower die 22. The upper die 40 is constituted of e.g. the die-steel made upper die insert 41 at the center part, the carbon steel or the cast iron-made first annular upper die 42 and a bronze-made second annular upper die 43. The side dies 30 are made of the bronze and the tip surface of a pure copper-made cooling rod 31 is faced to a consecutively formed thick part between a disc forming part 51 and a rim forming part 53 to cool the thick part more easily than the other part to prevent the occurrence of cavity. In such a way, the solidification with directivity can be obtd. by making the thermal conductivity of dies higher as leaving from a weir 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting mold apparatus, and more particularly to a casting mold apparatus used for obtaining the directional solidification of molten metal in Mg alloy, Al alloy and the like.

[0002]

2. Description of the Related Art In the past, a cooling means was installed in a casting mold device and the cooling device was controlled to achieve the directional solidification of the molten metal.

[0003]

However, in such a conventional casting machine, since the cooling means is installed in the casting machine, the casting machine becomes complicated and the maintenance thereof is troublesome. did.

[0004]

In order to achieve the above object, in the casting mold apparatus according to the present invention, the casting space is composed of a plurality of molds, and different materials are appropriately used for these molds. It is a thing.

[0005]

Since the casting mold apparatus according to the present invention is constructed as described above, it is possible to adopt as a material for each casting mold in order of desired solidification of the molten metal and in descending order of thermal conductivity. Is.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a low pressure casting mold apparatus for a vehicle wheel, and FIG. 2 is a sectional view of the same gravity casting mold apparatus.

In FIG. 1, reference numeral 10 is a base of the casting apparatus D. The base 10 supports a casting mold S for forming a vehicle wheel. The mold apparatus S is a combination of a lower mold 20, a pair of horizontal molds 30 and 30, and an upper mold 40. A casting space 50 is formed by the casting mold apparatus S. The casting space 50 is in the shape of a wheel for a vehicle and is composed of a disk forming portion 51, a spoke forming portion 52, and a rim forming portion 53. 60 is a weir provided in the lower mold 40, and 61 is this weir.
It is Stoke that is serially installed in 60.

The lower die 20 is composed of a lower die insert (made of die steel) 21 which constitutes the central part thereof and a first annular lower die (made of carbon steel or cast iron) 22 which constitutes the periphery thereof. here,
The lower die insert 21 is for forming the surface of the disk portion (of the vehicle wheel), and the annular die 22 is mainly for forming the surface of the spoke portion (of the vehicle wheel). Is.

The upper die 40 is composed of an upper die insert (made of die steel, thermal conductivity of 0.07 or less cal / cmsec ° c) 41 forming a central portion and a first annular upper die (carbon steel or Cast iron, thermal conductivity of about 0.1 or less cal / cmsec ° c) 42 and this first annular mold 42
Second annular upper mold located around (Bronze, approximately 0.2 or less c
al / cmsec ° c) 43 and. Here, the upper die insert 41 is for forming the back surface of the disk portion (of the vehicle wheel), and the first annular upper die 42 is mainly the back surface of the spoke portion (of the vehicle wheel). The second annular upper die 43 is mainly for forming the back surface of the back side rim portion (of the vehicle wheel). In addition, 45 is pure copper installed in the upper mold 40 (heat conductivity 0.4 to 0.9c
It is a core made of al / cmsec ° c).

The horizontal die 30 is made of bronze like the second annular upper die 43. Further, 31 is a cooling rod made of pure copper fitted in the horizontal die 30. The tip end surface of this cooling rod 31 faces a continuous portion of the disk forming portion 51 and the rim forming portion 53 in the casting space 50, a so-called thick portion. For this reason, the horizontal mold 30 is more easily cooled than the other parts, so that it is possible to prevent the nest of the continuous portion.

Since the mold apparatus S uses materials having a large thermal conductivity in order from the mold away from the weir 60, the weir 60
Radial directional coagulation centered around can be obtained.
In addition, pure copper (heat conductivity 0.4 to 0.9 cal / c
A core made of msec ° c) is used, but this is not intended for directional solidification, but for early solidification in order to obtain the strength of the disc portion.

FIG. 2 shows a casting mold apparatus for gravity casting, and 35 is a runner, which opens at the lower part of the rim forming portion 53 in the casting space 50. 48 and 48 are riser spaces and the rim formation part
It is provided at the upper end of 53.

In this casting mold device D, materials having a large thermal conductivity are used in order from the casting molds far from the positions of the feeders 48, 48 (lower mold (made of bronze) 20> horizontal mold (carbon steel or Cast iron) 30 / First annular upper die (made of carbon steel or cast iron) 42>
Upper die insert (made of die steel) 41, second annular upper die (made of die steel) 43, third annular upper die (made of die steel) 44), which can obtain directional solidification directed from the bottom to the top it can.

[0013]

In the casting mold apparatus according to the present invention, the casting space is made up of a plurality of molds, and different materials are appropriately used for these molds. Therefore, it is desired to solidify the molten metal as a material for each mold. Therefore, it can be adopted in order from the one having the largest thermal conductivity.

Therefore, by using this casting mold device, it is possible to obtain the directional solidification of the molten metal without providing cooling means as in the conventional case. As a result, the casting device itself becomes simple,
It is easy to maintain.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a low pressure casting mold device for a vehicle wheel.

FIG. 2 is a cross-sectional view of the gravity casting mold apparatus.

[Explanation of symbols]

 S ... Mold device. 20… Lower mold (mold) 21… Lower mold insert (mold) 22… First annular lower mold (mold) 30… Horizontal mold (mold) 40… Upper mold (mold) 41… Upper mold insert (mold) 42… First annular upper mold (mold) 43… Second annular upper mold (mold) 44… Third annular upper mold (mold) 50… Casting space

Claims (1)

[Claims] 1. A casting mold apparatus, wherein the casting space is composed of a plurality of molds, and materials of these molds are appropriately different.