JPH04108949U - die casting mold - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a die-casting mold that can delay the solidification of molten metal near the gate and prevent the generation of shrinkage cavities due to solidification shrinkage within the product. [Structure] A die-casting mold (1) that has a pair of inserts (4) and (5) in which a cavity (6) and a gate part (7) are formed, and that presses molten metal into the cavity (6) at high speed. In this step, the gate part constituent members (9) (9) are attached to the inserts (4) and (5), respectively, and the gate part constituent members (9)
(9) constitutes the gate section (7). Further, a plurality of voids (10) are formed in the gate portion constituent members (9) (9) at the contact surfaces with the inserts (4) (5).

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention improves product quality by preventing shrinkage cavities caused by solidification and shrinkage of molten metal. This invention relates to a die-casting mold that can be used as a mold.

0002

[Conventional technology]

Die casting is traditionally known as the most typical casting method for obtaining metal products. In cast casting, as shown in Fig. 7, a fixed main mold (2) incorporating a fixed insert (4) is used. , a movable main mold (3) incorporating a movable insert (5), and both inserts (4) and (5) above. The spool bush (11), plunger tip (12) and sprue are arranged horizontally below. This is done using an injection mechanism (14) consisting of a core (13), etc. nest (4) The abutment surface of (5) has a cavity (6) configured to correspond to the shape of the product, a molten metal The runner (8) forming the flow path between the cavity (6) and the runner (8) A gate portion (7) having a relatively small cross-sectional area and forming a sprue is formed. Not shown When the molten metal is supplied from the supply mechanism into the injection mechanism (14), the plunger tip (12) moves horizontally at high speed, pushing the molten metal through the runner (8) and the gate (7). Press fit into the cavity (6). The molten metal that was press-fitted begins to solidify rapidly, but at this time In order to prevent shrinkage cavities due to solidification and contraction of the molten metal in the cavity (6), Pressure is applied with the plunger tip (12) and molten metal is forced in to replenish the molten metal for solidification shrinkage. I am providing.

0003

[Problem that the idea aims to solve]

By the way, generally, as shown in FIG. 7, the thickness (t') of the gate part (7) is It is made thin in order to increase the flow rate of hot water into the cavity (6). Therefore , the molten metal near the gate solidifies faster than the molten metal in the cavity (6), and as a result, The replenishment supply of molten metal from the injection mechanism (14) is cut off, preventing subsequent solidification in the cavity. The shrinkage remains in the product as shrinkage cavities, reducing product quality.

0004 In view of the above problems, the purpose of this invention is to delay the solidification of the molten metal near the gate and We offer a die-casting mold that can prevent shrinkage cavities caused by solidification shrinkage within the product. It is about providing.

[0005]

[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 insert. A cap configured to match the shape of the product is placed on the abutment surface with the movable insert built into the main mold. The cavity, the runner that constitutes the flow path for the molten metal, and the molten metal between the cavity and the runner. A gate part constituting the mouth is formed, and the above-mentioned key is formed by a horizontally arranged injection mechanism. In die-casting molds where molten metal is forced into the cavity at high speed, the gate part is Consists of a gate component that is mounted facing both inserts, and the gate component is attached to the insert. It is characterized by having means for preventing heat conduction to.

[0006] Specifically, a gap is formed on the contact surface between the gate component and the insert, or the upper A heat insulating material may be interposed between the gate component component and the insert, or the gate component component The insert is made of a material that has a different thermal conductivity or heat capacity than the insert.

[0007] Furthermore, the fixed insert incorporated into the fixed main mold and the movable insert incorporated into the movable main mold. The abutment surface has a cavity configured to correspond to the shape of the product and a flow path for the molten metal. The runner and the gate part that forms the sprue between the cavity and the runner are shaped like The molten metal is pressurized at high speed into the cavity by the horizontally arranged injection mechanism. In the die-casting mold to be inserted, the gate part is mounted facing both inserts. A heating means is provided inside the gate part constituent member.

[0008]

[Effect]

In the present invention, the gate part is composed of gate part constituent members mounted opposite to the insert, The gate component includes means for preventing heat conduction to the insert. specifically teeth,

[0009] 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.

0010 These measures make it difficult for the heat of the molten metal near the gate to be conducted to the insert, and the gate This makes it possible to slow down the temperature drop of the molten metal near the opening. As a result, the gate part It can delay the solidification of nearby molten metal.

[0011] In addition, the gate part is composed of gate part constituent members mounted opposite to the insert, and the gate By providing heating means inside the component parts, the gate part can be heated independently of the temperature of the insert. It becomes possible to forcefully set the temperature to any desired temperature regardless of the temperature. In other words, forcing the gate part As a result, the solidification of the molten metal near the gate area is delayed. can be done.

0012 With the above configuration, the solidification of the molten metal near the gate is delayed, and the molten metal is replenished. Smoothly press into the cavity to prevent shrinkage cavities due to solidification shrinkage.

[0013]

【Example】

Examples of the die casting mold according to the present invention will be described below with reference to FIGS. 1 to 6. Ru. As shown in FIGS. 1 and 2, this die-casting mold (1) has a fixed insert ( The fixed main mold (2) incorporates the movable insert (5), and the movable main mold (3) incorporates the movable insert (5). ), and the abutment surfaces of both inserts (4) and (5) have a shape corresponding to the shape of the product. The formed cavity (6), the runner (8) constituting the flow path for the molten metal, the cavity A gate portion (with a relatively small cross-sectional area) that constitutes a sprue between the runner (6) and the runner (8) 7) is configured. In addition, the gate part (7) corresponds to the respective inserts (4) and (5). It is composed of gate component members (9) (9) that are attached to the gate, and The bottom component members (9) (9) have multiple voids (10) on the contact surfaces with the inserts (4) and (5). Several are formed. On the other hand, below the inserts (4) and (5), there is a spool bush ( 11), plunger tip (12), spool core (13), etc. 14) are arranged horizontally. When molten metal is supplied to the injection mechanism (14), the plunger The cap tip (12) moves horizontally at high speed, transferring the molten metal to the runner (8) and the gate part (7). It is press-fitted into the cavity (6) through the hole.

[0014] 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. Furthermore, the timing at which the molten metal solidifies depends on the contact area of the void (10). It can be obtained arbitrarily by changing it appropriately. As a result of the above, inside the cavity (6) The molten metal near the gate part (7) did not solidify during the press-in of the molten metal, and the molten metal did not solidify in the cavity (6). The molten metal can now be pressed in smoothly until the solidification is completed, and the molten metal inside the cavity (6) is The occurrence of shrinkage cavities due to solidification and contraction of hot water can be reliably prevented.

[0015] 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, other configurations, actions and effects are shown in Figures 1 and 2. It is exactly the same as .

[0016] 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). With this configuration, the temperature of the heating medium or the supply position of the heating medium can be changed as appropriate. If so, the gate component (9) can be maintained at an arbitrary temperature, and the gate component (7) Proper solidification timing of nearby molten metal can be obtained. Therefore, into the cavity (6) It is possible to prevent the molten metal from starting to solidify near the gate part (7) during press-in of the molten metal. The injection of hot water can be carried out smoothly until the solidification is completed, and the solidification shrinkage inside the cavity (6) The occurrence of shrinkage cavities can be reliably prevented. FIG. 6 shows the inside of the gate part component (9). A heater (19) is placed in the vertical direction, and this heater (19) is used to heat the gate component. (9) is forcibly heated. Even if this is done, it is the same as the case shown in Figure 5. The result is obtained.

[0017] 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

[0018]

[Effect of the idea]

According to the present invention, the gate part is composed of gate part constituent members mounted opposite to the insert. However, the gate part component retains means for preventing heat conduction to the insert. follow As a result, the heat of the molten metal near the gate becomes difficult to conduct to the insert, and the heat of the molten metal near the gate becomes difficult to conduct. It becomes possible to slow down the temperature drop. Also, attach the gate part facing the insert. A heating means shall be provided inside the gate component. The gate part can be forcibly set to an arbitrary temperature regardless of the temperature of the insert. becomes possible. That is, the gate portion can be maintained at a high temperature.

[0019] As a result, the solidification of the molten metal near the gate can be delayed compared to inside the cavity. , the supplied molten metal is smoothly press-fitted into the cavity without solidifying near the gate. It will be done. Therefore, shrinkage cavities due to solidification shrinkage are prevented within the cavity, and the product Quality improvement can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a die casting mold according to the present invention.

FIG. 2 is a sectional view of a main part of a die-casting 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 cross-sectional view of a conventional die-casting mold.

[Explanation of symbols]

1 Die casting mold 2 Fixed main mold 3 Movable main mold 4 Fixed nesting 5 Movable insert 6 Cavity 7 Gate section 8 Runner 9 Gate component components 10 void 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 die-casting metal die-casting method in which a runner and a gate part forming a sprue are formed between the cavity and the runner, and molten metal is injected into the cavity at high speed through the runner and the gate part by a horizontally arranged injection mechanism. In the mold, the gate part is constructed of a gate part constituent member mounted opposite to both inserts, and the gate part constituent member has a means for preventing heat conduction to the inserts. die casting mold. 2. The die-casting mold according to claim 1, wherein a gap is formed at a contact surface between the gate portion constituent member and the insert. 3. The die-casting mold according to claim 1, wherein a heat insulating material is interposed between the gate portion constituent member and the insert. 4. The die-casting 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. 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 die-casting metal die-casting method in which a runner and a gate part forming a sprue are formed between the cavity and the runner, and molten metal is injected into the cavity at high speed through the runner and the gate part by a horizontally arranged injection mechanism. 1. A die-casting mold characterized in that the gate part is formed of a gate part constituent member mounted opposite to both inserts, and a heating means is provided inside the gate part constituent member.