JPS58196159A - Die for forging of molten metal - Google Patents

Abstract

PURPOSE:To enable the multiple-piece productin of products having homogeneous quality by providing plural cavities which are formed at the same distance from the center in a storage place for molten metal and are spaced at equal intervals from each other and plural runners of the same shape and the same size which communicate the cavities and the storage space for molten metal and are formed at equal intervals from each other. CONSTITUTION:Molten metal is charged through a charging port 35 into dies for forging of molten metal, and is stored in a storage space 19 for molten metal. The molten metal is pressurized with a pressurizing plunger 15 in the lower part of the part 19 so as to be distributed and packed in plural cavities 41, whereafter the molten metal is pressurized and solidified under hydrostatic high pressure. The plural cavities 41 are formed approximtely at the same distance from the center of the part 19 and are spaced at equal intervals from each other. Plural runners 21 of the same shape and the same size which communicate the cavities 41 and the part 19 are formed at equal intervals from each other.

Description

[Detailed description of the invention] The present invention relates to a mold for molten metal forging.

In the molten metal forging method, molten metal is filled into a cavity formed by an upper die and a lower die, and is solidified under high hydrostatic pressure to form a product. Since this molten metal forging method solidifies the molten metal under high pressure, it can eliminate shrinkage cavities, pinholes, etc. and produce products with excellent mechanical properties, such as automobile wheels, flanges for large bobbins, and various gears. However, when manufacturing multiple products, it is necessary to uniformly feed the molten metal to each of the multiple cavities.

Conventionally, this type of mold has a structure in which multiple cavities such as a single runner communicate with each other, or a hot water storage section is provided to temporarily store the molten metal from the pouring spout, and this hot water storage section and the multiple cavities are connected. There are various types of molds, such as those that have a structure in which multiple runners communicate with each other, but when filling molten metal in any mold, the molten metal flows unevenly into each cavity, and each cavity is pressurized to the same value. However, the solidification rate, cooling rate, thermal contraction, etc. of the molten metal in each cavity are different, making it impossible to obtain a homogeneous product, and the mold may be partially worn, resulting in poor mold durability. There was a problem.

The present invention has been made to solve the above-mentioned problems.The molten metal is stored in the hot water storage space from the pouring spout, and the molten metal is pressurized by a pressurizing plunger provided at the bottom of the hot water storage space, and the molten metal is poured into a plurality of cavities. After filling the distribution.

A mold for forging molten metal configured to pressurize and solidify under high hydrostatic pressure, a plurality of cavities formed at approximately the same distance from a lower part of a hot water storage space and equally spaced from each other, and the cavities and the hot water storage space. This mold for forging molten metal is characterized by having a plurality of runners of the same shape and size which are connected to each other and formed at equal intervals.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of the lower mold with the upper mold removed.

Fig. 2 is a sectional view corresponding to the line A-A' in Fig. 1, showing the state of the pressurizing plunger before operation, and Fig. 3 is a sectional view corresponding to the line A-B in Fig. 1, showing the state of the pressurizing plunger before operation. Indicates the operating state.

1 is an upper mold, 2 is a lower mold, and an upper die base 3 and a lower die base 4 are fixed to the upper surface of the upper mold 1 and the lower surface of the lower mold 2, respectively, and the mating surface of the upper mold 1 and the lower mold 2 is 5°6. The mold is clamped by engaging.

A hot water storage space hole 11 is provided in the center of the lower mold 2,
Further, a primary pressurizing sleeve 13 is vertically provided from the lower die base 4 with an inner hole 12 matching the hole 11 for the hot water storage space.

A primary pressurizing plunger 15 fixed to the end of a rod 14 inserted through the inner hole 12 is fitted into the hot water storage space hole 11 so as to be vertically slidable. The primary pressurizing plunger 1
5 is formed with a protrusion 17 having a predetermined height and a diameter smaller than that of the circumferential body 16, and this primary pressurizing plunger 15, the hot water storage space hole 11, and the upper A hot water storage space 19 is formed with the cutout 18 formed in the lower part.

At the upper end of the hot water storage space 19, there are runners 21 of the same shape and size that are spaced at equal intervals in the circumferential direction of the hot water storage space 19 and extend radially around the axis of the hot water storage space 19. 2L
One end of 21, 21 is open.

The runner 21 is a cutout 22 at the bottom of the upper mold 1 and a lower mold.

The other end of the runner 21 opens to the lower part of each corresponding cavity 41, and the lengths of the lifts 21 are all the same.

Further, the lower end opening 32 of the hot water pouring sleeve 31 faces the upper end of the hot water storage space 19 out of phase with the runner 21.

The pouring sleeve 31 is a tubular member fitted and supported between the lower part of the upper mold 1 and the upper part of the lower mold 2, and the inside thereof is formed with a pouring path 33, into which the pouring sleeve 31 can freely move forward and backward. A plunger 34 is fitted, and a spout 35 is attached to the upstream side.

The cavity 41 includes a cavity hole 42 penetrating through the upper mold 1, an insert member 43 suspended in the cavity hole 42, and a lower part with a cross-sectional shape matching the cavity hole 42. The cavities 41 are all centered on the same circumference F around the axis of the hot water storage space 19, and are spaced at equal intervals and have the same shape. It is formed to the same size.

The insert member 43 has an upper flange portion 45 held between the upper die base 3 and the upper mold 1, and a main body portion 46 suspended in the cavity 41, and has a center hole 47 of the insert member 43 and a guide hole of the upper die base 30. A knockout par of 49 is inserted between 48 and 49 at will.

A sliding hole 50 is opened at the center of the cavity recess 44 of the lower mold 2, and a secondary pressurizing plunger 51 is fitted into the sliding hole 50.

The secondary pressurizing plunger 51 has a rod 53 that is inserted through a secondary pressurizing sleeve 52 that is vertically disposed from the lower die base 4.
The secondary pressurizing plunger 51 is fixed to the tip end thereof and slides up and down by the operation of the rod 53, and the operation, pressurizing force, etc. of the secondary pressurizing plunger 51 are all formed the same.

Although the air venting of each cavity 41 is not shown, it is designed so that all cavities 41 are vented under the same conditions.

The functions and effects will be explained below. After the upper mold 1 is lowered by a drive device (not shown) and clamped with the lower mold 2, molten metal is poured into the device from the pouring port 35.

At this time, the pouring plunger 34 is positioned above the pouring port 35, and the primary pressure plunger 15 and the secondary pressure plunger 51 are positioned at predetermined lower positions, respectively, as shown in FIG. The molten metal poured from the pouring port 35 flows through the pouring path 33 and is stored in the hot water storage space 19.

After pouring a predetermined amount of metal from the pouring port 35, the pouring plunger 34
is activated, the opening 32 of the injection path 33 is closed, and the primary pressurizing plunger 15 is then raised by a predetermined amount at a predetermined slow speed. As the primary pressurizing plunger 15 rises, the hot water storage space 19 is The stored molten metal flows through runner 21. Each cavity 41. Flows into... In this case, runner 21
All have the same shape and size, and are arranged at equal intervals around the hot water storage space 19, so that the molten metal overflowing from the upper end of the hot water storage space 19 flows through each runner 21 at the same speed and flow rate.
In addition, since the length of each runner 21 is the same and each cavity 41 is arranged on the same circumference centered on the axis of the hot water storage space 19 of the same shape and size, each cavity 41 The same amount of molten metal is supplied and filled into each cavity 41 at the same speed, and the primary pressure plunger 15 pressurizes each cavity 41.
The molten metal is uniformly pressurized inside.

Next, the secondary pressure plunger 51 is raised by a predetermined amount to pressurize the molten metal in the cavity 41, and in this state, the molten metal is solidified. In this case, each cavity 41 is filled with the same amount of molten metal in the same state, so the molten metal in each cavity 41 has the same solidification rate, cooling rate, thermal contraction, etc., and is solidified under pressure. The quality of the products in each cavity 41 is all uniform.

After a certain period of time, the mold is opened, the knockout pars 49 inserted into each insert member 43 are made to protrude, and the product is taken out from the upper mold 1. As is clear from the above, according to the present invention, a homogeneous product is produced by the molten metal forging method. In addition, since the flow rate and flow velocity of molten metal to each cavity are uniform, there is no local wear of the mold (excellent durability, and the mold can be molded evenly around the hot water storage space).
Since the cavities are arranged at equal distances, it is easy to remove the mold force of the product, and the temperature of the mold can be easily controlled, which provides excellent effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the lower mold with the upper mold removed, and FIG. 2 is a plan view of the lower mold with the upper mold removed.
A sectional view corresponding to the line A' shows the state of the pressurizing plunger before operation, and FIG. 3 is a sectional view corresponding to the line A-B of FIG. 1 showing the state of the pressurizing plunger during operation. In the drawing, 1 is an upper mold, 2 is a lower mold, 15 is a primary pressure plunger, 19 is a hot water storage space, 21 is a runner, 35 is a pouring spout,
41 is a cavity 0 Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] Molten metal is stored in the hot water storage space from the pouring hole, pressurized by a pressurizing plunger installed at the bottom of the hot water storage space, distributed and filled into multiple cavities, and solidified under high hydrostatic pressure. In a mold for forging molten metal, a plurality of cavities are formed at equal intervals from each other at approximately the same distance from the center of the entire molten metal storage space, and a plurality of cavities of the same shape and the same shape are formed at equal intervals so as to connect the cavities and the molten metal storage space. Molten metal forging mold 0 characterized by having multiple large runners