Die for vertical extrusion casting

Abstract

The invention discloses a vertical squeeze casting die which comprises a fixed die part, a movable die part and a sliding block mechanism, the fixed die part is provided with a sprue bush, the fixed die part comprises a movable die core, and the vertical squeeze casting die is characterized in that the sliding block mechanism comprises at least two sliding block cores which are arranged on the side portion of the movable die core in an opening and closing mode. The sliding block core, the movable mold core and the sprue bush jointly define a casting cavity and a runner which is communicated with the cavity and is used for a casting solution to enter, and an ejection mechanism is arranged in the movable mold core; when the mold is opened, the movable mold part drives the movable mold core, the sliding block core and the forming piece to be separated from the sprue bush arranged on the fixed mold part, then the sliding block core is opened to be separated from the forming piece, and finally the forming piece is ejected out through the action of the ejection mechanism. The vertical extrusion casting die has the advantages that under the condition that the die does not depend on in-die hot cutting, large complex parts with inverted buckling or protruding characteristics in the die opening direction can be produced, and therefore the application range of the vertical extrusion casting process is expanded.

Description

Technical Field

[0001] This invention relates to the field of extrusion casting technology, and in particular to a mold for vertical extrusion casting. Background Technology

[0002] With the accelerating electrification of automobiles, higher manufacturing requirements are being placed on the strength, elongation, and production cycle of key structural components (such as large tie rod brackets). Extrusion casting is favored because it can balance material properties and production efficiency. Currently, common extrusion casting methods are mainly divided into horizontal extrusion casting and vertical extrusion casting. Vertical extrusion casting offers unique advantages for certain parts that are constrained by structural limitations (such as difficulties in horizontal feeding or excessive demolding clamping force).

[0003] However, traditional vertical extrusion casting molds have the following limitations in use: (1) Strict demolding restrictions: They usually require products to be opened only in the vertical (up and down) direction. If the product has undercut features in the opening direction, it cannot be demolded smoothly, which greatly limits the geometric complexity of the parts that can be produced; (2) Reliance on in-mold hot cutting: An in-mold hot cutting mechanism (such as a central extrusion rod) must be used to cut off the gating system and the sprue before the mold is opened. This requires the product itself to have a sufficiently large (usually diameter > 80 mm) through hole for the hot cutting mechanism to operate. This makes the mold only able to produce plate-shaped parts with such large hole features, and the product types are extremely limited. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a mold for vertical extrusion casting, which enables the production of large and complex parts with undercut or protrusion features in the mold opening direction without relying on in-mold hot cutting, thereby expanding the applicability of vertical extrusion casting process.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A vertical extrusion casting mold includes a fixed mold part, a moving mold part, and a slider mechanism. The fixed mold part is provided with a sprue sleeve. The moving mold part includes a moving mold core. The slider mechanism includes at least two slider cores that can be opened and closed and are arranged on the side of the moving mold core. In the mold-closed state, the slider cores, the moving mold cores, and the sprue sleeve together form a casting cavity and a flow channel for molten casting that is connected to the casting cavity. An ejector mechanism is provided inside the moving mold core. When the mold is opened, the moving mold part drives the moving mold core, the slider cores, and the molded part to first separate from the sprue sleeve provided on the fixed mold part. Then, the slider cores open to detach from the molded part. Finally, the ejector mechanism ejects the molded part.

[0006] The fixed mold part includes a fixed mold frame, the sprue sleeve is disposed inside the fixed mold frame, and the fixed mold frame is provided with a drainage structure for draining the liquid accumulated inside the fixed mold frame after spraying.

[0007] The drainage structure includes an annular drainage groove formed within the fixed mold frame and surrounding the sprue sleeve. The fixed mold frame is provided with drainage holes, and the annular drainage groove is connected to the drainage holes through a drainage channel.

[0008] A positioning structure for eliminating the gravitational offset of the slider core is provided between the slider core and the moving mold part. The positioning structure includes a positioning part provided on the slider core and a positioning groove provided on the moving mold part for the positioning part to be embedded and positioned during mold closing.

[0009] The positioning part is an I-beam structure fixedly mounted on the slider core.

[0010] A positioning and locking mechanism is provided between the slider core and the fixed mold part for accurately positioning the slider core and the moving mold part during mold closing and for locking the slider core to prevent it from retracting under the action of expansion force.

[0011] The positioning and locking mechanism includes a locking block fixedly mounted on the fixed mold frame. The locking block has a mating surface that matches the side profile of the slider core and a wedge-shaped locking portion protruding from the mating surface. The slider core is provided with a locking cavity that mates with the wedge-shaped locking portion.

[0012] A thermal expansion gap is provided between the mating surface of the locking block and the side of the slider core, and between the wedge-shaped locking part and the corresponding surface of the locking cavity.

[0013] The moving mold core and the sliding block core are made of HTCS-130 mold steel.

[0014] The slider core is driven to open and close by a drive mechanism.

[0015] Compared with the prior art, the advantages of the present invention are as follows: (1) By setting up a slider mechanism, the moving mold core, slider core and the molded part can be separated from the fixed mold as a whole when the mold is opened. Then, the side demolding is achieved by the side opening of the slider core. This allows the product to have undercut features in the mold opening direction, which improves the adaptability of vertical extrusion casting process to parts with complex geometric structures. (2) Since the slider core can be opened during the mold opening process, there is no need to rely on traditional hot cutting mechanisms such as the center extrusion rod to cut the gating system, thereby avoiding the limitation that the product must have a large diameter through hole in the traditional solution, and broadening the types of parts that can be produced; (3) By setting an ejection mechanism in the moving mold core and combining the reasonable planning of the opening and closing of the slider core and the ejection action, the demolding process is automated and integrated, which is conducive to improving the geometric freedom of the parts, maintaining the efficiency advantage of vertical extrusion casting, and the mold structure is relatively simple and reliable. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention in the mold-closed state; Figure 2 This is an exploded structural diagram of the moving mold core, sliding block core, sprue sleeve, and molded part in this invention; Figure 3 This is a top view of the fixed mold frame in this invention. Figure 4 This is a cross-sectional view of the connection between the slider core and the moving mold core in this invention. Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure at point BB; Figure 6 This is a cross-sectional view of the connection between one of the slider cores and the fixed mold frame in this invention. Figure 7 for Figure 6 A cross-sectional view of the structure at point CC. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] As shown in the figure, a vertical extrusion casting mold includes a fixed mold part, a moving mold part, and a slider mechanism. The fixed mold part is provided with a sprue sleeve 1. The moving mold part includes a moving mold core 2. The slider mechanism includes at least two slider cores 3 that can be opened and closed and are provided on the side of the moving mold core 2. In the mold closed state, the slider cores 3, the moving mold core 2, and the sprue sleeve 1 together form a casting cavity 10 and a flow channel 11 for the molten casting to enter, which is connected to the casting cavity 10. An ejection mechanism (not shown in the figure) is provided inside the moving mold core 2. When the mold is opened, the moving mold part drives the moving mold core 2, the slider cores 3, and the molded part A to first separate from the sprue sleeve 1 provided on the fixed mold part. Then, the slider cores 3 open to detach from the molded part A. Finally, the ejection mechanism ejects the molded part A.

[0019] In this specific embodiment, the fixed mold part includes a fixed mold frame 4, and a sprue sleeve 1 is disposed within the fixed mold frame 4. The fixed mold frame 4 is provided with a drainage structure for draining the liquid accumulated within it after spraying. By providing a drainage structure in the fixed mold part, the water accumulated within the fixed mold frame 4 after spraying is effectively drained, preventing residual liquid from vaporizing during casting or from entering the product interior with the hot molten aluminum due to the Leidenfrost effect, thus avoiding defects such as bubbles, cold shuts, and porosity in the casting. This effectively improves the quality and yield of the casting.

[0020] In this specific embodiment, the drainage structure includes an annular drainage groove 41 formed within the fixed mold frame 4 and surrounding the sprue sleeve 1. The fixed mold frame 4 is provided with drainage holes 42, and the annular drainage groove 41 is connected to the drainage holes 42 via a drainage channel 43. The above drainage structure is simple in structure and has a clear drainage path. Based on this drainage structure, residual moisture can be dried using the air blowing device built into the extruder.

[0021] In this specific embodiment, a positioning structure is provided between the slider core 3 and the moving mold part to eliminate the gravity offset of the slider core 3. The positioning structure includes a positioning part 31 provided on the slider core 3 and a positioning groove 21 provided on the moving mold part for the positioning part 31 to be embedded and positioned during mold closing. The positioning structure is used to actively guide and correct the gravity offset of the slider core 3 caused by its own weight after mold opening. By utilizing the pre-fitting and guiding of the positioning part 31 and the positioning groove 21 during mold closing, the slider core 3 is accurately positioned, thereby effectively eliminating the influence of gravity offset on the mold closing accuracy, ensuring the complete sealing of the cavity after mold closing and the accuracy of the final casting dimensions. This design solves the positioning problem of large sliders in vertical molds caused by the suspended state, and improves the stability and reliability of mold operation.

[0022] In this specific embodiment, the positioning part 31 is an I-beam structure fixedly mounted on the slider core 3. The I-beam structure is divided into an engaging part 311 and a mounting part 312. The engaging part 311 is used to engage with the positioning groove 21 for precise positioning during mold closing. The mounting part 312 is fixedly connected to the slider core 3 and the slider seat 30 that drives the slider core 3. The I-beam structure itself has a high moment of inertia, and its I-shaped cross-section can provide bidirectional (horizontal and vertical) rigid support and guidance, which can effectively resist lateral forces or off-center loads that may occur during mold closing, ensuring that the slider core 3 is positioned smoothly and accurately without shaking.

[0023] In this specific embodiment, a positioning and locking mechanism is provided between the slider core 3 and the fixed mold part for accurately positioning the slider core 3 and the moving mold part during mold closing and for locking the slider core 3 to prevent it from retracting under the action of expansion force.

[0024] In this specific embodiment, the positioning and locking mechanism includes a locking block 5 fixedly mounted on the fixed mold frame 4. The locking block 5 has a mating surface 51 adapted to the side contour of the slider core 3 and a wedge-shaped locking part 52 protruding from the mating surface 51. The slider core 3 is provided with a locking cavity 33 that mates with the wedge-shaped locking part 52. The above-mentioned positioning and locking mechanism has guiding, positioning, and rigid locking functions. It guides the slider core 3 to accurately align with the fixed mold during mold closing; the wedge-shaped locking structure effectively resists the huge casting expansion force, prevents the slider from retreating, ensures the stability of the mold under high pressure, and ensures the dimensional qualification of the product.

[0025] In this specific embodiment, a thermal expansion gap is provided between the mating surface 51 of the locking block 5 and the side of the slider core 3, and between the corresponding surface of the wedge-shaped locking part 52 and the locking cavity 33. The reserved thermal expansion gap can prevent high-temperature jamming and ensure that the positioning locking mechanism can work reliably under hot conditions.

[0026] In this specific embodiment, the moving mold core 2 and the slider core 3 are made of HTCS-130 mold steel. HTCS-130 mold steel is a special mold steel with high thermal conductivity and high thermal stability. It can significantly improve the mold's thermal fatigue resistance, high-temperature hardness retention, and thermal conductivity under continuous action of high-temperature molten aluminum (720℃±10℃), thereby extending the mold's service life and facilitating uniform solidification of castings, thus improving product quality.

[0027] In this specific embodiment, the slider core 3 is driven to open and close by the drive mechanism 6. The drive mechanism 6 is typically a hydraulic cylinder, which automates and precisely controls the opening and closing action of the slider core 3, ensuring the stability and reliability of the mold opening sequence, improving production cycle and operational safety, and forming the basis for the entire mold to achieve complex demolding actions.

Claims

1. A vertical extrusion casting mold, comprising a fixed mold portion, a moving mold portion, and a slider mechanism, wherein the fixed mold portion is provided with a sprue sleeve, and the moving mold portion includes a moving mold core, characterized in that... The slider mechanism includes at least two slider cores that can be opened and closed and are disposed on the side of the moving mold core. In the mold closed state, the slider cores, the moving mold cores, and the sprue bushing together form a casting cavity and a flow channel for molten casting to enter, which is connected to the casting cavity. An ejection mechanism is provided inside the moving mold core. When the mold is opened, the moving mold part drives the moving mold core, the slider cores, and the molded part to first separate from the sprue bushing disposed on the fixed mold part. Then, the slider cores open to detach from the molded part. Finally, the ejection mechanism ejects the molded part.

2. The vertical extrusion casting mold as described in claim 1, characterized in that... The fixed mold part includes a fixed mold frame, the sprue sleeve is disposed inside the fixed mold frame, and the fixed mold frame is provided with a drainage structure for draining the liquid accumulated inside the fixed mold frame after spraying.

3. A vertical extrusion casting mold as described in claim 2, characterized in that... The drainage structure includes an annular drainage groove formed within the fixed mold frame and surrounding the sprue sleeve. The fixed mold frame is provided with drainage holes, and the annular drainage groove is connected to the drainage holes through a drainage channel.

4. A vertical extrusion casting mold as described in claim 1, characterized in that... A positioning structure for eliminating the gravitational offset of the slider core is provided between the slider core and the moving mold part. The positioning structure includes a positioning part provided on the slider core and a positioning groove provided on the moving mold part for the positioning part to be embedded and positioned during mold closing.

5. A vertical extrusion casting mold as described in claim 4, characterized in that... The positioning part is an I-beam structure fixedly mounted on the slider core.

6. A vertical extrusion casting mold as described in claim 1, characterized in that... A positioning and locking mechanism is provided between the slider core and the fixed mold part for accurately positioning the slider core and the moving mold part during mold closing and for locking the slider core to prevent it from retracting under the action of expansion force.

7. A vertical extrusion casting mold as described in claim 6, characterized in that... The positioning and locking mechanism includes a locking block fixedly mounted on the fixed mold frame. The locking block has a mating surface that matches the side profile of the slider core and a wedge-shaped locking portion protruding from the mating surface. The slider core is provided with a locking cavity that mates with the wedge-shaped locking portion.

8. A vertical extrusion casting mold as described in claim 6, characterized in that... A thermal expansion gap is provided between the mating surface of the locking block and the side of the slider core, and between the wedge-shaped locking part and the corresponding surface of the locking cavity.

9. A vertical extrusion casting mold as described in claim 1, characterized in that... The moving mold core and the sliding block core are made of HTCS-130 mold steel.

10. A vertical extrusion casting mold as described in claim 1, characterized in that... The slider core is driven to open and close by a drive mechanism.

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