Multi-runner die-casting die

Abstract

The utility model belongs to the technical field of die-casting dies, and provides a multi-runner die-casting die which sequentially comprises an upper die, a lower die and a base from top to bottom, an upper die core is further arranged at the lower end of the upper die, a lower die core is further arranged on the lower die and corresponds to the upper die core, a runner structure is further arranged along the inner side of the upper die, and the runner structure is arranged on the base. The lower die comprises two sets of lower die cores and is used for conveying molten metal, the two sets of lower die cores are symmetrically arranged, a translation mechanism is further arranged along the upper end of the lower die, the translation mechanism is connected with the lower die cores and used for driving the lower die cores to move, and an ejection mechanism is further movably arranged in the middle of the lower die. The lower die core is driven by the translation mechanism to be pulled open, a die casting placed in the die cavity is ejected out through the ejection mechanism, the upper end of the ejection block of the ejection mechanism is a flat surface, the contact area is larger, scratches are not prone to being left on the surface of a thin workpiece, and the problem of local deformation of the workpiece cannot be caused even if the contact area is large.

Description

Technical Field

[0001] The utility model belongs to the technical field of die-casting molds, and particularly relates to a multi-gate die-casting mold. Background Art

[0002] A die-casting mold is a tool for casting metal parts, and is a tool for completing the die-casting process on a special die-casting forging machine. The basic die-casting process is as follows: the molten metal is first cast into the mold cavity at a low speed or a high speed. The mold has a movable cavity surface, which is pressurized and forged during the cooling process of the molten metal, eliminating the shrinkage cavity and porosity defects of the blank, and also making the internal structure of the blank reach the broken grains in the forged state. The comprehensive mechanical properties of the blank are significantly improved.

[0003] If the die-casting part is a long and thin workpiece, when the workpiece is ejected by the ejector pin mechanism, scratches will be left on the surface of the workpiece, and the die-casting part is relatively thin as a whole, and the contact surface between the ejector pin and the die-casting part is small. Therefore, using the ejector pin mechanism may also cause the die-casting part to deform, affecting the subsequent processing technology. Content of the Utility Model

[0004] The utility model provides a multi-gate die-casting mold, which solves the problems in the prior art.

[0005] The technical solution of the utility model is realized as follows:

[0006] A multi-gate die-casting mold successively includes an upper mold, a lower mold and a base from top to bottom. An upper mold core is further arranged at the lower end of the upper mold. A lower mold core is correspondingly arranged for the lower mold and the upper mold core. A runner structure is arranged along the inner side of the upper mold for conveying molten metal. The lower mold core includes two groups and is symmetrically arranged. A translation mechanism is arranged along the upper end of the lower mold. The translation mechanism is connected with the lower mold core for driving the lower mold core to move. An ejection mechanism is movably arranged at the middle position of the lower mold. The upper end of the ejection mechanism is a flat surface. When the die-casting part is demolded, the translation mechanism drives the lower mold core to pull apart towards both ends, and then the lower mold approaches the base. The ejection mechanism is pushed upwards from the inner side of the lower mold, driving the die-casting part to complete demolding.

[0007] Further, a mold cavity is further opened inside the lower mold core.

[0008] Further, the runner structure further includes a gate arranged at the upper end of the upper mold. A flow splitter is arranged at the lower end of the gate. Flow splitting grooves are opened on the side surface of the flow splitter. The gate is connected with the flow splitting grooves in a through manner. The lower end of the flow splitting grooves is connected with a runner in a through manner.

[0009] Further, the translation mechanism includes a cylinder seat fixedly installed at the upper end of the lower mold. A sliding block is movably connected along the length direction of the cylinder seat. A slider is fixedly connected to the upper end of the sliding block. The slider is fixedly connected with the lower mold core.

[0010] Further, the upper end face of the slider is C-shaped, and the lower die core is fixed inside the slider for driving the lower die core to translate.

[0011] Further, the ejection mechanism includes a thimble fixedly arranged at the upper end of the base. The upper end of the thimble is movably inserted inside the lower die, and an ejection block is also in contact with the upper end of the thimble. The ejection block is movably arranged inside the lower die.

[0012] Further, the cross-section of the ejection block is U-shaped, and both ends are movably arranged inside the lower die. The upper end is a flat surface for demolding the die-casting part.

[0013] After adopting the above technical solution, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, by providing a translation mechanism and an ejection mechanism, the translation mechanism drives the lower die core to open, and the ejection mechanism is used to eject the die-casting part placed in the mold cavity. The upper end of the ejection block of the ejection mechanism is a flat surface, with a larger contact area. For relatively thin workpieces, it is not easy to leave scratches on their surfaces, and the large contact area will not cause local deformation of the workpiece. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of a multi-gate die-casting mold of the present utility model;

[0017] Figure 2 It is a schematic sectional structure diagram of a multi-gate die-casting mold of the present utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the lower die.

[0019] In the figure, 10. upper die; 11. gate; 12. sprue bushing; 13. upper die core; 20. lower die; 21. lower die core; 22. ejection block; 23. mold cavity; 30. base; 40. thimble; 50. cylinder seat; 51. sliding block; 52. slider; 60. runner. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] Embodiment: As Figures 1 - 3 shown, a multi-gate die-casting mold includes, from top to bottom, an upper mold 10, a lower mold 20, and a base 30 in sequence. An upper mold core 13 is fixedly arranged along the lower end of the upper mold 10. A lower mold core 21 is fixedly arranged corresponding to the upper mold core 13 along the upper end of the lower mold 20. The upper mold core 13 is a convex mold. Therefore, a mold cavity 23 is also opened inside the lower mold core 21.

[0022] During operation, the upper mold core 13 enters the mold cavity 23 of the lower mold core 21. A plurality of groups of runners 60 are also opened along the inside of the upper mold 10, which are connected through the area formed by the upper mold core 13 and the mold cavity 23. A sprue cone 12 is arranged at the upper end of the runner 60, and a gate 11 is arranged at the upper end of the sprue cone 12. The runner 60, the sprue cone 12, and the gate 11 are all connected through. So that the molten metal can pass through the runner on the sprue cone 12 along the gate 11, and then enter the area formed by the upper mold core 13 and the mold cavity 23 along the runner 60, waiting to be cooled and formed.

[0023] After the workpiece is cooled and formed, as Figure 3 shown, the lower mold cores 21 are symmetrically arranged in two groups. The two groups of lower mold cores 21 are spliced together. A translation mechanism is also arranged on the lower mold 20. The translation mechanism is also provided with two groups corresponding to the lower mold cores 21. The translation mechanism includes a cylinder seat 50 fixedly installed at the upper end of the lower mold 20. A sliding block 51 is movably arranged on the cylinder seat 50. A slider 52 is fixedly connected along the upper end of the sliding block 51. The upper end cross-section of the slider 52 is C-shaped. The lower mold core 21 is clamped and fixedly connected inside the slider 52 through the slider 52. After the workpiece is shaped, the upper mold 10 is lifted. At this time, the die-casting part is located in the mold cavity 23 of the lower mold core 21. The slider 52 is driven to move by the sliding block 51, and the lower mold core 21 is pulled in the opposite direction.

[0024] As Figure 2 shown, a ejector pin 40 is also arranged on the base 30, and an ejector block 22 is arranged inside the lower mold 20. The upper end of the ejector pin 40 passes through the inside of the lower mold 20 and fits with the lower end of the ejector block 22. The cross-section of the ejector block 22 is U-shaped. The distance between the two groups of lower mold cores 21 after being pulled apart should be slightly larger than the width of the upper end of the ejector block 22, which is convenient for the ejector block 22 to eject upward. The ejector block 22, as Figure 2Both ends shown are movably connected to the inner side of the lower mold 20, and its upper end is a flat surface. At this time, it is necessary to jack up the die-casting part in the lower mold core 21, lean the lower mold 20 towards the base 30, and the ejector pin 40 jacks up the ejector block 22 from the lower mold 20. The ejector block 22 jacks up the die-casting part located in the mold cavity 23 to demold it.

[0025] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-runner die-casting mold, comprising, from top to bottom, an upper mold (10), a lower mold (20) and a base (30), wherein the lower end of the upper mold (10) is further provided with an upper mold core (13), the lower mold (20) and the upper mold core (13) are further provided with a lower mold core (21) correspondingly, and a runner structure is further provided along the inner side of the upper mold (10) for conveying molten metal, characterized in that: The lower die core (21) includes two groups and is symmetrically arranged. A translation mechanism is also arranged along the upper end of the lower die (20). The translation mechanism is connected to the lower die core (21) and is used to drive the lower die core (21) to move. An ejection mechanism is also movably arranged in the middle position of the lower die (20). The upper end of the ejection mechanism is a flat surface. When the die casting is demoulded, the translation mechanism drives the lower die core (21) to be pulled apart at both ends, and then the lower die (20) approaches the base (30). The ejection mechanism is pushed upward from the inner side of the lower die (20), driving the die casting to complete demoulding.

2. A multi-gating die-casting mold according to claim 1, characterized in that: A mold cavity (23) is also provided inside the lower mold core (21).

3. The multi-gating die-casting mold according to claim 1, characterized in that: The runner structure also includes a gate (11) arranged at the upper end of the upper mold (10), a diverter cone (12) is also arranged at the lower end of the gate (11), a diverter groove is opened on the side of the diverter cone (12), the gate (11) and the diverter groove are connected through, and the lower end of the diverter groove is connected through with the runner (60).

4. The multi-gating die-casting mold according to claim 1, characterized in that: The translation mechanism comprises a cylinder seat (50) fixedly mounted at the upper end of the lower die (20), a sliding block (51) movably connected along the length direction of the cylinder seat (50), a slider (52) fixedly connected to the upper end of the sliding block (51), and a fixed connection between the slider (52) and the lower die core (21).

5. The multi-gating die-casting mold according to claim 4, characterized in that: The upper end surface of the slider (52) is C-shaped, and the lower mold core (21) is fixed to the inner side of the slider (52) to drive the lower mold core (21) to move in translation.

6. The multi-gating die casting mold according to claim 1, characterized in that: The ejection mechanism comprises an ejector pin (40) fixedly arranged on the upper end of the base (30), the upper end of the ejector pin (40) being movably inserted into the inner side of the lower mold (20), the upper end of the ejector pin (40) also being in contact with an ejection block (22), and the ejection block (22) being movably arranged on the inner side of the lower mold (20).

7. The multi-gating die casting mold according to claim 6, characterized in that: The ejector block (22) has a U-shaped cross section, with two ends movably arranged inside the lower mold (20), and an upper end having a flat surface for demoulding the die casting.

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