JPS6061155A - Forging device of molten metal - Google Patents

Abstract

PURPOSE:To decrease the temp. drop of a molten metal by inserting a vertically movable pressurizing plunger into a lower die to form a pressurizing cavity between said plunger and an upper mold and pressurizing and solidifying the molten metal injected into the die cavity via the pressurizing cavity. CONSTITUTION:A pressurizng plunger 6 is vertically movably inserted into a through-hole 5a penetrated to a lower die 5 and a recess 7 for storing a molten metal is provided by a top surface 6a and an annular projecting line 6b. A projecting part 8 for extruding a molten metal is provided to an upper die 3 to form a cavity 9 for pressurizing the molten metal by the recess 7 and the projecting part 8. The molten metal is injected into an injecting passage 10 and the plunger 6 is raised to close the injecting port of the passage 10 facng the cavity 9. When the pojecting part 8 advances into the recess 7, the extruded melt is injected through a communicating hole 12 into a die cavity 11. The cavities 9, 11 are held under specified pressure for several seconds and the solidification ends. The temp. drop of the molten metal is thus decreased and the pouring equipment is made smaller in size.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a molten metal forging apparatus that presses and solidifies molten metal injected from a molten metal injection passage into a mold cavity via a pressurized cavity to form a product.

Prior art In general, in molten metal forging equipment, metals are pressure welded to each other.
-1 Molten metal is injected from an injection passage into a mold cavity formed in a pair of molds, and the molten metal is solidified under pressure by a pressurizing plunger. As shown in the above publication, an apparatus has been proposed in which molten metal is injected into a mold cavity through a pressure plunger insertion hole in an upper mold, and then the pressure plunger is inserted into the insertion hole to solidify the molten metal under pressure. However, this device has a problem in that it takes a long time from the completion of supplying the hot water until the start of pressurization, which lowers the temperature of the molten metal and adversely affects the quality.

Also, from the pressurizing plunger insertion hole formed in the lower mold of JZ shown in Japanese Patent Application Laid-Open No. 56-128657, the mold kit t/1 m
``JT'' has been proposed in which the molten metal is injected into the tee, and then a pressurized plunger is inserted into the insertion hole to add the molten metal. There are problems in that a converter is required, which increases the size of the hot water supply equipment, and the temperature of the molten metal decreases. Furthermore, JP-A-56-160
As shown in Japanese Patent No. 863, a molten metal injection passage is formed on the side of the upper mold separately from the pressurizing plunge 17 insertion hole,
As shown in Japanese Utility Model Application No. 57-146955, a device has been proposed which forms or covers an easily dissolvable injection passage on the side of the lower mold separately from the insertion hole of the pressurizing plunger. Both methods have the problem that it is difficult to remove residual molten metal remaining in the injection passage.

OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to make it possible to downsize hot water supply equipment and to reduce the temperature drop of molten metal, especially for small items. It is an object of the present invention to provide a molten metal forging device that can easily perform a large number of pieces of molten metal and can also easily remove residual molten metal during molding.

Structure of the Invention In order to achieve the above object, the present invention is equipped with a pair of upper and lower molds that are pressure-bonded to beans, and the lower mold is provided with a pressure plunger 1a insertion hole, and the pressure plunger is inserted into the insertion hole. A7 is slid together, and a recess for storing molten metal is provided by the inner wall surface of the insertion hole and a surface of the pressurizing plunger, a pressurizing cavity is formed by the recess and the lower surface of the upper mold, and the upper and lower molds are joined. The surface is provided with an injection passage for injecting molten metal into the four parts, and a mold cavity that communicates with the recess is provided, and the pressurizing plunger is further provided with a closing member that closes the injection passage during pressurization. A configuration is adopted in which the pressure plunger is provided so as to protrude from the upper surface.

EXAMPLE Hereinafter, an example embodying the present invention will be explained with reference to FIGS.
A lower die 3 is fixed to the press table 4 via an upper die table 2 ( ), and a lower die 5 corresponding to the upper die 3 is fixed to the lower surface of the press table 4 . A cylindrical pressure plunger 6 is fitted into a cylindrical insertion hole 5a placed downward with respect to the center of the lower mold 5, and is placed upward on the side of the plastic table 4. It is moved back and forth in the vertical direction by a hydraulic cylinder (not shown).

An annular protrusion 61 serving as a closing member of the present invention is integrally formed near the outer periphery of the lower surface 6a of the pressure plunger 6.
Four parts 7 for storing molten metal are formed by the ring 6a and the annular protrusion 6b. On the other hand, an annular protrusion 6b of the pressurizing plunger 6 is provided at the center of the lower surface of the upper mold 3.
a is recessed, and a molten metal extrusion protrusion 8 for entering the molten metal storage four parts 7 and extruding the molten metal in the recess 7 is integrally formed on the bottom surface 3b of the fitting hole 3a. There is. and'
A pressurizing cavity 9 for pressurizing the molten metal is formed by the fitting hole 3a of the lower mold 3, the bottom surface 3b1, the protrusion 5 part 8, the insertion hole 5a of the lower mold 5, and the recess 7 of the pressurizing plunger 6. There is.

An injection passage 10 for injecting molten metal into the four parts 7 provided at the upper end of the pressurizing plunge V6 is formed in a part of the joint surfaces 3c and 5b between the lower mold 3 and the lower mold 5. Type 3,
It is designed to be opened when the mold is released in step 5. Further, the joint surfaces 3c and 5b of the upper and lower molds 3 and 5 are coated with a product P shown in FIG.
A plurality of mold cavities 11 (in this embodiment, 10 as shown in FIG. 2) capable of molding are formed radially, and each mold cavity 11 communicates with the pressure cavity 9 through a communication hole 12. The mold cavity 11 and the communication hole 12 are opened when both the upper and lower molds 3 and 5 are released.

Next, the operation of the molten metal forging apparatus configured as described above will be explained.

First, as shown in FIG. 3(a), the molten metal is
4 is injected into the injection passage 10 and supplied to the recess 7 for self-molten metal storage. Incidentally, the amount of molten metal poured at this time 6- is the amount required to mold the product P divided by 1, and the amount of molten metal required to connect each product P added thereto.

After that, pressurize the pressure plunger 6 by 1X.
7 As the volume of Bitey 9 decreases, the pressure plunge V6
The injection hole 1 facing the pressurized opening 9 of the injection passage 10 is closed by a part of the annular protrusion 6b, and the protrusion 8 enters into the four parts 7, and the molten metal in the recess 7 is pushed out. Therefore, the molten metal is injected into the mold cavity 11 through the communication hole 12. Furthermore, the pressurizing plunger 6 is moved away from the upper stomach to apply pressure to the pressurizing chamber 9 and the mold cavity 11 to a constant pressure (for example, 0°5 to 1,01/cm'), and this state is maintained for several seconds. The molten metal 14 is solidified.

Next, the pressure plunger 176 is moved downward to separate the four parts 7 from the solidified molten metal 14, and then the upper mold 3 and the lower mold 5 are separated, and the molten metal 14 is peeled off from the lower surface of the upper mold 3. The molded portion is separated by the die cavity 11, and the molding of the product P is completed.

Now, in the embodiment of the present invention, an injection passage 10 for molten metal is provided on the joint surfaces 3c and 5b of both the upper and lower molds 3.5, and a recess 7 for storing the molten metal supplied from the injection passage 10 is provided on the upper surface of the knob plunger 6. , it is not necessary to provide special equipment for hot water supply, and therefore the hot water supply equipment can be downsized, and the molten metal can be pressurized immediately by the pressurizing plunger 6 after being supplied to the four parts 7. As a result, the temperature drop of the molten metal can be reduced and the quality can be improved.
can be opened to easily remove molten metal residue. In addition, in the embodiment of the present invention, a plurality of mold cavities 11 are provided radially outside the pressurized cavity 9 ('J1).Since the molten metal in the pressurized cavity 9 is press-fitted into the mold cavity 11, Multiple pieces can be easily picked up.

In addition, in the embodiment, the upper surface 6 of the pressurizing plunger 6
Although the annular protrusion 6b is provided on the a to form the recess 7, when the pressurizing plunger 6 is placed on the upper back, the plunger 6
It is possible to reduce the possibility that the molten metal 14 gets caught in the gap between the outer circumferential surface of the mold and the insertion hole 5a of the lower die 5, thereby reducing damage to the pressurizing plunger 6 and the insertion hole 5a.

d3, the present invention can also be embodied in the following embodiments.

(1) The annular protrusion 61+ of the pressurizing plunger 6 is omitted, and instead a closing protrusion (not shown) capable of closing the injection port on the pressurizing cavity 9 side of the injection passage 10 is provided. In this case, the L surface 6a of the pressurizing plunger 6 and the insertion hole 5a of the lower mold 5 form four parts 7 for storing molten metal.

(2) As shown in Figures 5 and 6? l-J: The insertion hole 5a of the sea urchin lower mold 5 is made into a square cylinder shape, and the pressure plunger 6 is
is formed into a square +1 shape, and a closing member 15 that becomes a part of the lower mold 5 and forms the injection passage 10 is provided on one side of the plunge 176 (the protrusion 8 of the J1 upper mold 3 is omitted).

Effects As described in detail above, the present invention can downsize the hot water supply equipment, reduce the temperature drop of the molten metal, and in particular can easily take out a large number of small items.
Furthermore, there is an effect that the molten metal residue 9- can be easily removed when the mold is opened.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the molten metal forging apparatus of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Figs.
(C) is a sectional view for explaining the molten metal forging method, FIG. 4 is a perspective view of the product, and FIG. 5 is a sectional view showing another part of the present invention.
FIG. 6 is a sectional view taken along the line B--B in FIG. 5. Upper mold 3, lower mold 5, pressure plunger 6, annular protrusion 61),
Four parts 7 for storing molten metal, pressurized cavity 9, injection passage 10
, mold capacity 11, closing member 15゜Special contract application artificial
1) Toyoda Automatic Loom Works Representative Patent Attorney On 1) Hiroshi Nobu 10- Figure 3 (a) (b) 3' 8 No. 0 1o ・；5 / 7. 11th (c)

Claims (1)

[Claims] 1. Equipped with a pair of upper and lower molds that are press-joined to each other, the lower mold is provided with a pressure plunger insertion hole, the pressure plunger is slid into the insertion hole, and the pressure plunger is inserted into the insertion hole. providing four parts for storing molten metal by the inner wall surface of the hole and the upper surface of the pressurizing plunger, and forming a pressurizing cavity by the recessed part and the lower surface of the mold,
An injection passage for injecting the molten metal into the four parts is installed on the joint surface of the upper and lower molds, and a mold key A7 is provided which communicates with the recess, and the pressurizing lunges 1 to 7 are provided with an injection path for injecting molten metal into the four parts. A molten metal forging apparatus characterized in that a closing member for closing the injection passage is provided so as to protrude from the upper surface of the pressurizing plunger. 2. On the outside of the upper surface of the pressurizing plunger, an annular protrusion is formed to form four parts for storing molten metal and to serve as the closing member, and on the lower surface of the -h shape, a ring for extruding 1q of molten metal that enters the inside of the recess is formed. The molten metal forging apparatus according to claim 1, wherein the molten metal forging apparatus is provided with a convex portion. 3. The molten metal forging apparatus according to claim 1, wherein the closing member is provided so as to form a part of the lower mold and to form the lower mold side of the injection passage.