JPH04108948U - squeeze cast mold - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a squeeze cast mold that has a thin gate part and allows separation of products using a trimming mold. [Structure] A pair of inserts (4) (5) in which a cavity (6) and a gate portion (7) are formed, and an injection mechanism (14) arranged vertically below the inserts (4) (5). ), in which the molten metal is pressurized upward into the product cavity (6) at low speed by the injection mechanism (14),
The gate part configuring members (9) are mounted on each of the inserts (4) and (5) so as to face each other, and the gate part (7) is constructed so that the thickness (t) is reduced. In addition, the gate part component (9)
A plurality of gaps (10) are formed in (9) at the contact surface with the inserts (4) and (5).

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a squeeze machine that can easily separate the product after the molten metal has solidified. This relates to strike molds.

0002

[Conventional technology]

When performing die casting, especially when casting high-density metal products, it is important to Quiz cast casting method is implemented. This squeeze cast casting is as shown in Figure 8. A fixed main mold (2) incorporating a fixed insert (4) and a movable insert (5) are included. The sleeve is arranged vertically below the movable main mold (3) and both inserts (4) and (5). Injection mechanism (14) consisting of (11), injection sleeve (13), plunger tip (12), etc. ). The mating surfaces of the inserts (4) and (5) are configured to correspond to the shape of the product. cavity (6), runner (8) forming a flow path for molten metal, cavity (6) A gate part (7) with a relatively small cross-sectional area that constitutes a sprue is formed between the has been completed. When molten metal is supplied into the injection mechanism (14) from a supply mechanism (not shown), , the plunger tip (12) moves upwards at low speed, sending the molten metal through the runner (8) and the gate. Press fit into the cavity (6) through the top part (7). At this time, the molten metal flows from the bottom to the top. The molten metal is filled into the cavity (6) by being pressed at low speed. There is no air entrapped, thus preventing air from entering the molten metal and increasing the temperature. It becomes possible to obtain a dense product.

0003 By the way, in the above-mentioned squeeze cast casting, the molten metal is poured into the cavity at a sufficiently low speed. (6), the molten metal solidifies early at the reduced diameter gate (7), In order to prevent shrinkage cavities due to solidification and contraction of the cavity (6), the gate part (7) The thickness (t') is thicker than the thickness of the gate part of a normal die-casting mold (generally 4 mm or more).

0004

[Problem that the idea aims to solve] When the molten metal filled in the cavity solidifies in the above process, it separates at the gate. Separate to get the cast product. At this time, with the normal die-casting method, the thickness of the gate part is also thin. Therefore, the product can be easily broken off using a trimming die. however In the squeeze casting method, the gate part is thick and cannot be separated using the trimming type. However, a separate cutting process must be established to separate the products using a cutting machine. . This not only increases the number of steps in the casting process, but also requires cutting machines to Productivity is significantly reduced because it has to be manufactured for each formula or shape. There was a problem.

[0005] In view of the above problems, the purpose of this invention is to reduce the thickness of the gate part and An object of the present invention is to provide a squeeze cast mold that enables separation of products.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, the present invention combines a fixed insert built into a fixed main mold and a movable main mold. A cavity configured to correspond to the shape of the product is placed on the contact surface with the movable insert built into the mold. a runner that forms a flow path for the molten metal, and a sprue between the cavity and the runner. A vertically arranged injection mechanism allows the molten metal to rise upwards. Squeeze cast is press-fitted into the cavity through the runner and gate at low speed. In the mold, the gate part is attached to both inserts so as to face each other. It is characterized by being formed with a thinner material.

[0007] In addition, a gap may be formed on the contact surface between the gate component and the insert, or the gate portion may be A heat insulating material is interposed between the gate part constituent member and the insert, or the gate part constituent member is The insert may be made of a material with different thermal conductivity or heat capacity.

[0008] Furthermore, a heating means may be provided inside the gate portion constituent member.

[0009]

[Effect]

By configuring the gate part with the gate part component attached to the insert, it is possible to The gate portion can be thermally independent. In other words, the gate is Only the constituent members can have their own thermal properties. in particular,

0010 A gap is formed at the contact surface between the gate part constituent member and the insert. A heat insulating material is interposed between the gate part constituent member and the insert. The gate component is made of a material that has different thermal conductivity and heat capacity from the insert.

[0011] These measures make it difficult for the heat of the molten metal near the gate to be conducted to the insert, and the gate It is possible to lower the temperature of the molten metal near the melting point and slow down solidification. Also,

0012 By providing a heating means inside the gate component, the gate can be It becomes possible to forcibly set an arbitrary temperature regardless of the temperature.

[0013] With the above configuration, the solidification timing of the molten metal near the gate can be adjusted according to the thickness of the gate. It can be set arbitrarily regardless of the

[0014]

【Example】

Examples of the squeeze cast mold according to the present invention will be described below with reference to FIGS. 1 to 6. I will clarify. This squeeze mold (1) has a fixed insert as shown in Figs. 1 and 2. The fixed main mold (2) incorporating (4) and the movable main mold (2) incorporating the movable insert (5) 3), and the mating surfaces of each insert (4) and (5) have a A configured cavity (6), a runner (8) constituting a flow path for the molten metal, a cavity A gate portion (7) constituting a sprue is formed between the runner (6) and the runner (8). There is. In addition, the gate part (7) has a gate part structure attached to each insert (4) and (5). The width (t) of the gate part is is thinner. Furthermore, the gate part constituent members (9) (9) have inserts (4). ) A plurality of voids (10) are formed on the contact surface with (5). On the other hand, nest (4) ( 5) Below the sleeve (11), plunger tip (12), injection sleeve (13) ) etc., the injection mechanism (14) is arranged vertically. Inside the injection mechanism (14) When the molten metal is supplied, the plunger tip (12) moves upward at low speed to pump the molten metal into the ladle. It is press-fitted into the cavity (6) via the inner tube (8) and the gate portion (7).

[0015] The heat held by the molten metal near the gate part (7) passes through the gate part component (9). Conducts to the inserts (4) and (5), but the gate component (9) and the inserts (4) and (5) Since a gap (10) is formed between the inserts (4) and (5), heat conduction to the inserts (4) and (5) is It's not done smoothly. Therefore, the solidification of the molten metal near the gate part (7) can be delayed. becomes possible. Also, the timing at which the molten metal solidifies is determined by adjusting the contact area of the void (10). It can be obtained arbitrarily by changing it as needed. As a result of the above, the thickness of the gate part (7) ( Even if t) is made thinner than conventional products, it is possible to obtain appropriate coagulation timing. In other words, even if the gate part (7) is made thinner, the molten metal in the cavity (6) will not completely solidify. The molten metal near the gate part (7) does not start to solidify, ensuring smooth press-in of the molten metal. be done. In addition, by reducing the thickness (t) of the gate part (7), the low velocity of the molten metal can be reduced. There is a problem that the supply is obstructed, but this problem is caused by the gate part (7) perpendicular to the paper plane in the drawing. This problem can be solved by increasing the width in the direction and making the cross-sectional area the same as that of conventional products.

[0016] Other embodiments are shown in FIGS. 3 and 4. Figure 3 shows the gate component (9) and the insert (4). ) and (5) with a heat insulating material (17) interposed between them. Also, as shown in Figure 4, Additionally, a heat insulating material (16) may be placed within the void (10). Furthermore, illustrations are omitted. However, the material has lower thermal conductivity or larger heat capacity than inserts (4) and (5). The gate portion constituent member (9) may be made of a material such as ceramics. the above In either case, the other configurations and actions/effects are shown in Figures 1 and 2. It's exactly the same.

[0017] Figures 5 and 6 show heating means (18) (19) arranged inside the gate component (9). Indicate the case. Of these, Fig. 5 shows how oil, etc. is applied from the outside into the gate component (9). The heating medium is supplied through the supply pipe (18), and the gate component (9) is forcibly heated with the heating medium. It is heated and maintained at a high temperature to delay solidification of the molten metal near the gate part (7). As a result, even if the gate part (7) is thinned, the molten metal does not solidify quickly, and the heating medium Appropriate coagulation timing can be achieved by appropriately changing body temperature or heating medium supply position. It becomes possible to obtain FIG. 6 shows the inside of the gate component member (9) in the direction perpendicular to the plane of the paper. A heater (19) is placed on the gate part component (9) with this heater (19) is forcibly heated. Even if this is done, the same result as shown in Figure 5 will be obtained. is obtained.

[0018] In addition, by selecting a plurality of configurations shown in FIGS. 2 to 6 described above, the gate part constituent member (9) It is also possible to configure In addition, the present invention is based on the vertical mold clamping vertical injection method shown in FIG. It is also applicable to the squeeze cast construction method.

[0019]

[Effect of the idea]

According to the present invention, the solidification timing of the molten metal near the gate portion is determined by the thickness of the gate portion. Since it can be set arbitrarily regardless of the relationship, it is possible to reduce the thickness (t) of the gate part. Become. As a result, separation of the product after solidification of the molten metal can be performed using a trimming type. This makes it easier to separate products and improve productivity in the casting process. Ru.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a squeeze cast mold according to the present invention.

FIG. 2 is a sectional view of a main part of a squeeze cast mold according to the present invention.

FIG. 3 is a sectional view showing an example of a gate part constituent member.

FIG. 4 is a sectional view showing an example of a gate part constituent member.

FIG. 5 is a sectional view showing an example of a gate part constituent member.

FIG. 6 is a sectional view showing an example of a gate part constituent member.

FIG. 7 is a sectional view showing the squeeze casting method of the vertical mold clamping vertical injection method.

FIG. 8 is a sectional view of a conventional squeeze cast mold.

[Explanation of symbols]

1 Squeeze cast mold 2 Fixed main mold 3 Movable main mold 4 Fixed nesting 5 Movable insert 6 Cavity 7 Gate section 9 Gate component components 10 void 14 Injection mechanism 17 Insulation 18, 19 Heating means

Claims (5)

[Scope of utility model registration request] Claim 1: A cavity configured to correspond to the shape of the product and a flow path for the molten metal are formed on the abutting surfaces of the fixed insert incorporated in the fixed main mold and the movable insert incorporated in the movable main mold. A squeeze casting method, in which a runner is formed, and a gate part forming a sprue is formed between the cavity and the runner, and the molten metal is forced into the cavity at low speed through the runner and the gate part by a vertically arranged injection mechanism. A squeeze cast mold, characterized in that the gate portion is formed to have a reduced thickness by a gate portion constituent member mounted opposite to both the inserts. 2. The squeeze cast mold according to claim 1, wherein a gap is formed at a contact surface between the gate part constituent member and the insert. 3. The squeeze cast mold according to claim 1, wherein a heat insulating material is interposed between the gate part constituent member and the insert. 4. The squeeze cast mold according to claim 1, wherein the gate portion constituting member is formed of a material having a different thermal conductivity or heat capacity from that of the insert. 5. The squeeze cast mold according to claim 1, wherein heating means is provided inside the gate portion constituent member.