JPH0768363A - Die for solid-liquid coexistent phase die casting - Google Patents

Abstract

PURPOSE:To manufacture a product of excellent quality where no failured parts such as oxide are mixed in the surface layer of the stock by using a die for the solid-liquid coexistent phase die casting where pouring basin parts are provided at the shunting piece and the runner respectively. CONSTITUTION:A recessed part is provided on a stock receiving surface of a shunting piece 5, and failured parts of the end surface of the stock is caught in the pouring basin part 6 to prevent them from entering in a runner 8. Then, a pouring basin part 9 which is the dead end is provided in the runner 8, the failured parts of the stock surface entering the runner 8 are stored, preventing them from entering a cavity 11. The pouring basin part 9 provided in the runner 8 is preferably provided at the branch point of the runner 8 when a plurality of product cavities 11 for mass-production are available. When only one product is produced, the runner 8 is bent, and the pouring basin part is preferably provided at the bent part. The failured parts of the surface layer of the stock which are not faced to the runner 8 during the injection do not enter the product because they are brought into contact with a bush 12 of low temperature between a sleeve 7 and the shunting piece 5 to be solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention proposes a die for solid-liquid coexistence region die casting which prevents the defective portion of the material surface from being mixed.

In the usual die casting method, a molten metal as a raw material is loaded into a sleeve by ladle or the like and injected. In contrast,
In the solid-liquid coexistence region (semi-molten metal) die-casting method, the bulk material is heated to a temperature at which a part of it melts and then injected. In the material of this solid-liquid coexistence region, the solid phases are connected like a net in the static state and the whole behaves like a solid, but when a large force is applied, the net connection of the solid phase is broken, and the broken solid phase particles Will float in the liquid phase and behave like a liquid as a whole.

When a material in such a solid-liquid coexistence region is die-cast, it moves in a solid state up to the gate, but when it passes through the gate, the mesh-like connection of the solid is broken and the liquid flows like a liquid. Therefore, it is possible to manufacture a product having a complicated shape similar to the die casting of the molten metal.

Compared with the die casting method for molten metal, the die casting method in the solid-liquid coexistence region has a lower temperature of the raw material, so that the heat load of the die is small, and the raw material of an accurate weight obtained by cutting the round bar can be used. It has advantages such as high yield and ease of high-speed automation because the material can be inserted into the sleeve in a solid state.

[0005]

2. Description of the Related Art Up to now, a mold used for die casting in a solid-liquid coexistence region has been the same as that used for die casting of a normal molten metal.

[0006] However, in die casting in the solid-liquid coexistence region, continuously cast round rods, extruded round rods, forged round rods, etc. are used as raw materials, but the surface layers including the end faces of these raw materials are subject to oxides, oils and fats adhesion. There are defects such as contamination, a structure different from the inside, and an oxide layer formed during heating during die casting. Therefore, in die casting in a solid-liquid coexistence region using a die casting mold for molten metal, there is a problem that the defective portion of the surface layer mixes with the product and deteriorates its quality.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to propose a die for solid-liquid coexistence region die casting, which can solve the above-mentioned problems advantageously and obtain a die casting product of good quality.

[0008]

As a result of various experiments, the present invention has revealed that, from the sleeve to the product cavity of the mold,
In addition to the shunt part, by providing a pool for the defective surface of the material surface layer on the runner part, we have found that a die-cast product can be obtained without the defective part of the material surface layer. It is a thing.

That is, the gist of the present invention is to provide a path for guiding the semi-molten metal material from the sleeve to the product cavity.
Solid-liquid coexistence region having a shunt placed facing the sleeve, and a runner and a gate that follow the shunt, in a die casting die, solid-liquid coexistence in which shunts are provided in the shunt and the runner, respectively. It is a die for die casting.

[0010]

The operation of the present invention will be described below. First, in a die casting mold for molten metal, the shunt placed facing the sleeve usually has its material receiving surface inclined so that the material press-fitted from the sleeve smoothly flows into the runner.

When a material having such a shunt is used to inject a material in the solid-liquid coexistence region, a defective portion of the end surface of the material enters the runner. Therefore, a basin with a depression is provided on the material receiving surface of the shunt to catch the defective portion of the end face of the material in this depression so that the defective portion does not enter the runner.

Next, when the tip of the material reaches the material receiving surface of the shunt and the pressure rises, the material begins to enter the runner, but the leading part is the defective part of the material surface facing the runner. Therefore, a dead pool is provided in the runner to make a dead end, and the defective part is filled in the hot pool to prevent the defective part from entering the product cavity.

Here, it is preferable that the water pool portion provided in the runner is provided at a branch point of the runner in the case of having a plurality of product cavities for taking a large number of products, and in the case of one picking the hot water. It is preferable to bend the road and provide it at the bend. The defective portion of the material surface layer that does not face the runner during injection does not enter the product because it contacts the low temperature bush between the sleeve and the shunt and hardens.

As described above, as a die casting mold in the solid-liquid coexistence region, by providing a pool of water in each of the shunt and the runner, it is possible to prevent the defective portion of the surface layer of the material from entering the product cavity. Therefore, it is possible to obtain a die-cast product of good quality in which the defective portion of the material surface layer is not mixed.

When the basin is provided only on either the shunt or the runner, it is difficult to completely prevent the defective portion of the material surface from being mixed into the product.

[0016]

【Example】

Conformity example 1 A rod-shaped material of Al-4mass% Si-1mass% Fe is heated to a solid phase ratio of 0.4 and a temperature of 614 ° C. to obtain 6 mm × 30 mm × 150.
Die casting in a solid-liquid coexisting region was performed using a mold shown in FIGS. 1 (a) and 1 (b), which is compatible with the present invention and is capable of taking two products having a size of mm. As a result, the material was filled in the entire product cavity, and no defective portion of the material surface layer was mixed in the product.

Here, FIG. 1 (a) is an explanatory view of a vertical cross section of a mold according to the present invention in which a shunt for taking two products and a pool for the runner are provided, and FIG. a) A-A
FIG.

The mold shown in FIGS. 1 (a) and 1 (b) has a fixed platen 1, a movable platen 2, a fixed mold 3, a movable mold 4, a shunt 5 facing the sleeve 7, and a shunt 5 with a recess. It is provided with a basin 6, which is additionally provided, a runner 8, a basin 9, which is provided at a branch point of the runner 8, a gate 10, a product cavity 11 and a bush 12.

Matching Example 2 Using the mold shown in FIGS. 2 (a) and 2 (b), which is adapted to the present invention, the same material can be heated in the same manner as in the matching example 1 to obtain one product of the same size. Then, the solid-liquid coexisting region was die cast. As a result, the material was filled in the entire product cavity, and no defective portion of the material surface layer was mixed in the product.

FIG. 2 (a) is an explanatory view of a vertical cross section of a mold according to the present invention in which a shunt for one product is provided and a pool for the runner is provided, and FIG. a) A-A
FIG. The mold in FIGS. 2 (a) and 2 (b) is
Fixed platen 1, movable platen 2, fixed mold 3, movable mold 4, shunt 5 facing the sleeve 7, a basin 6 provided with a recess in the shunt 5, a runner 8 having a bent part It comprises a pool 9 provided at the bent portion of the runner 8, a gate 10, a product cavity 11 and a bush 12.

Comparative Example 1 A metal mold as shown in FIGS. 3 (a) and 3 (b), which does not have a puddle, can be obtained by heating the same material in the same manner as in Comparative Example 1 in the same manner and obtaining two products of the same size. Die casting in the solid-liquid coexistence region was carried out using the molten metal die for die casting). As a result,
Although the material filled the entire product cavity, the product was found to contain defective parts of the material surface layer.

FIG. 3 (a) is an explanatory view of a vertical section of a die for die casting of a normal molten metal having no puddle portion for taking two products, and FIG. 3 (b) is a view taken along the line AA of FIG. 3 (a). It is a figure. Figure 3
The molds in (a) and (b) are the fixed platen 1, the movable platen 2, the fixed mold 3, the movable mold 4, the shunt 5 facing the sleeve 7, the inclined surface 13 of the shunt 5, the runner 8. , Gate 10, product cavity 11 and bush 12.

[0023]

EFFECT OF THE INVENTION The present invention is a die-casting die for solid-liquid coexistence region in which shunts and runners are respectively provided with baths, and by using the die according to the present invention,
In the die-casting in the solid-liquid coexistence region, it becomes possible to manufacture a product of good quality without inclusion of defective parts such as oxides in the surface layer of the material.

[Brief description of drawings]

FIG. 1 (a) is an explanatory view of a vertical cross section of a mold according to the present invention in which a shunt for taking two products and a pool for a runner are provided. (B) is an AA arrow view of (a).

FIG. 2 (a) is an explanatory view of a vertical cross section of a mold according to the present invention, in which a shunt for one product is provided and a pool for the runner is provided. (B) is an AA arrow view of (a).

FIG. 3A is an explanatory view of a vertical cross section of a die for die casting of a normal molten metal without a pool of two products.
(B) is an AA arrow view of (a).

[Explanation of symbols]

 1 Fixed plate 2 Movable plate 3 Fixed mold 4 Movable mold 5 Shunting device 6 Hot water pool part (shunting part) 7 Sleeve 8 Runway 9 Hot water pool part (runner part) 10 Gate 11 Product cavity 12 Bush 13 Splitting device Slope of

Front page continuation (72) Inventor Yuichi Ando 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Stock company Leotech

Claims (1)

[Claims] 1. A die for a solid-liquid coexistence region having a shunt, which is arranged facing the sleeve, and a runner and a gate which follow the shunt in a path for guiding the semi-molten metal material from the sleeve to the product cavity. In the solid-liquid coexistence zone die-casting mold, in which the shunt and the runner are respectively provided with baths.