JPS61193762A - Injection molding method for metal - Google Patents

Abstract

PURPOSE:To make possible injection molding of a high-temp. metal by moving intermittently plural unit molds and injecting the molten metal into the respective molds arriving at base point positions. CONSTITUTION:Plural sets of the molds A, B, C are juxtaposed in a transfer flask 1 and are made intermittently movable back and forth in a supporting flask 2. Pouring ports 6, 7, 8 communicating with the molding spaces are respectively provided to stationary molds (a), (b), (c) and are opened into the transfer flask 1. The flask 1 is started at the base end position P and the mold C is closed by a cylinder 5 and is pressed by a pressing mechanism 10. An injection mechanism 9 injects and pours the molten metal into the mold at the point of this time. The mold B is transferred to the base point position Q upon detaching of a pressing arm 15 and the molten metal (m) is poured. The frame 1 is intermittently transferred and the molten metal is successively poured into the molds. The moldings cooled for the required time are taken out of the molds. The injection molding of the high-temp. metal is made possible by the above-mentioned method.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a metal injection molding method, such as die casting, in which molten metal is injected into a mold by an injection mechanism and molded, and is particularly useful for high-temperature metals. Regarding the law.

(Prior art) Conventional die casting methods include one hot chamber method and one cold chamber method.
Arrogance targets materials such as aluminum alloys that can be heated up to about 780°C, and in either method, if the molten metal exceeds 800°C, mechanical parts such as molds lack thermal strength, making it impossible to process.

In addition, high-temperature metals with a melting temperature exceeding 800°C have a high thermal shrinkage rate and are prone to deterioration and cracking in the solidification zone, so injection molding cannot occur and immediate molding cannot be performed.
There is a problem that machining efficiency is significantly reduced.

(Object of the Invention) An object of the present invention is to solve the above-mentioned conventional problems and to enable injection molding of high-temperature metals, and to improve the molding processability to provide high-quality processed products.

(Structure) The processing method of the present invention consists of a set of two molds that are molded from a heat-resistant material and can be opened and closed, and the sets are made into a unit and moved from the base position to the space of one set into the hole. Then, the mold is moved to the base position again, and the mold that has reached the base position is closed, the molten metal is injected into the mold, and the mold is moved by at least one to several sets to perform high-temperature melting. The present invention is characterized in that the time required for the solidification temperature of the metal is taken, and the mold is opened at a position where the time required for the metal can be adjusted to remove the finished product.

Embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, (1) is a transfer frame that reciprocates intermittently at a set speed within a cross-shaped support frame (2); (1)
There are multiple sets (3 sets in the example drawings) of molds (A) (B)
) (C) are installed in parallel.

Molding molds (A), (B), and (C) are each a set of two molds, mold (A) is a set of a fixed mold (a) and a movable mold (a'), and mold (B) is a set of two molds. The molding die (C) is a set of a fixed mold (b) and a movable mold (b'), and the molding mold (C) is a set of a fixed mold (C) and a movable mold (C').

The fixed molds (a), (b), and (C) are fixedly arranged side by side on the transfer frame (1), and the movable molds (a') (b'>(c') are the fixed molds (a) (b) of the set. ) <C) Install so that both molding surfaces can be opened and closed.

The movable molds (a'), (b'), and (C') are connected to cylinders (3), (4), and (5) which open and close the molds and serve as holding members in the mold closed state.

The fixed types (a), (b), and (c) above are ceramic types or heat-resistant metal types such as sintered materials, and the movable types (a'>(b')
(C') is a heat-resistant metal type, and its fixed type (a) and (b)
(c) shows pouring channels (6), (7), and (8) leading to the molding space.
, and the outer end of the channel opens into the transfer frame (1).

The transfer frame (1) is moved intermittently in the left and right direction by a drive mechanism (not shown) to transfer the molds <A> (B) (C).
is intermittently moved, a position near the left end of this transfer frame (1) is set as a proximal position (P), and a mold (
The location where C) is located is defined as the base position @(Q).

The transfer frame (1) moves the mold (1) to the right from the base end position (P) and then stops (the mold (B) is at the base position (Q)), after stopping for a predetermined time. Molding mold 1 again
After moving the two pieces to the right, the mold (A) is stopped at the base position (Q)). When the mold (C) reaches the base position (Q) and stops, this operation is repeated (FIG. 3).

An injection mechanism (9) and a presser mechanism (10) are installed in front of the base position (Q).

The injection mechanism (9) pumps the melt 1 (m) by the piston (11).
is injected from the injection tube (12) in a timely manner.
12) The tip of the mold (A) has reached the base position (Q).
) (B) Make sure to face exactly the openings of the pouring channels (6), (7), and (8) in (C).

The presser mechanism (9) is a pedestal (13) fixed to the support frame (2).
Hydraulic cylinders (14) (14) are installed in the presser arm <1, which is moved forward and backward by the cylinders (14) (14).
5) The movable molds (a') (b') of <A), (B), and (C) are
) (C'') to reinforce the closed state of the mold.

Molten metal (n+) is a high temperature metal, that is, the melting temperature is 800℃
These metals include gunmetal, iron, duralumin, stainless steel, etc., which have a high content of copper.

To explain the processing method of the present invention with reference to FIG. 3, the transfer frame (1) starts from the base position (P), and at this position the mold (C) moves to the base position (Q). When the mold (C) is closed by the cylinder (5) and pressed by the presser mechanism (10), the injection mechanism (
The piston (11) of 9) descends and injects the melt 1 (m) into the mold (C) (Fig. 3 (1,)) e Next, the presser arm (15) of the presser mechanism (10) ( 15) is the mold (
After separating from C), the transfer frame (1) is transferred to the mold (
B) is conveyed to the base position @(Q) and stopped, and during the stopping period, the molten metal (R1
), and the mold (C) is held closed (FIG. 3(i)).

Next, the transfer frame (1) moves again, conveys the mold <A> to the base position (Q) and stops, and during the stop period, the melt) 9 (Im) is injected into the mold <A). Then, while holding the mold (B) in a closed state, the mold (C) is opened and the solidified product is ejected from the mold (C) (see Figure 3 (ti)).
)).

Thereafter, the transfer frame (1) moves back again to the base position CP> to make the mold (C) reach the base position (Q), and while stopped at this position, the molten metal (1) is transferred to the mold (C). ) is injected, the mold (A) is held in a closed state, and the finished product is ejected from the mold (B) (Fig. 3 (IV)).

Thereafter, the same operation is repeated, and each mold sequentially repeats the steps of pouring the molten metal, holding the molten metal (solidifying), and ejecting the molded product.

Note that the mold <A> is in the product molding process when the mold (B) is in the molten metal injection process (Fig. 3 (v)).

Figures 4 and 5 show modified examples of the mold transfer method,
The molds (A>(B), (C), and D) are installed on the rotary disk (20), and each mold (A) is formed by intermittent rotation of the rotary disk (20).
(B) (C)' (D) is the base position (Q) (molten metal injection process), molten metal holding process position (R), molding process position (S
), and the same processing operations as in the previous embodiment are performed at each process position.

In addition, it is also optional to set the molding process position to (S') in FIG.

(Effects) As described above, in the present invention, the mold is made of a heat-resistant material such as ceramic or sintered metal, so even if the molten metal is a high-temperature metal, injection molding can be performed without thermal damage to the mold, and the molten metal can be Since the product is held for a predetermined period of time after injection injection, it is possible to prevent the product from deteriorating or cracking during solidification and improve the quality of the product.Moreover, it is possible to sequentially inject the molten metal into multiple molds, hold the molten metal, and eject the molded product. Since each process is performed continuously, productivity can be maintained without reducing processing efficiency.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view of an apparatus for carrying out the method of the present invention;
The figure is a (I[)-(n) cross-sectional side view of the same, Fig. 3 is a process explanatory diagram of the method of the present invention, Fig. 4 is a plan view showing a modified example of the l position, and Fig. 5 is its (V) - (V) It is a track sectional view. In the figure, (1) is the transfer frame, <A> (B) (C) (D> is the mold, (10) is the injection mechanism, <Ill) is the molten metal, (Q
) is the base position, and (20) is the rotary disk. Patent applicant Nakano
Akio Hi

Claims (1)

[Claims] A set of two molds made of heat-resistant material that can be opened and closed,
The plurality of sets are made into a unit, and the mold is moved intermittently from the base position by a distance of one set, and then a mold transfer operation is performed to reach the base position again, and the mold that has reached the base position is closed. A metal injection molding method in which molten metal is injected into a mold and the mold is opened at a position where the mold has moved at least one to several sets to take out the product.