Accurate positioning device in magnesium alloy part die-casting process

Abstract

The utility model belongs to the technical field of magnesium alloy part die-casting, and particularly relates to an accurate positioning device in a magnesium alloy part die-casting process, which comprises a rack and slide rails arranged on the front side and the rear side of the rack, a protective door is slidably connected to the slide rails, a column frame is fixedly connected to the bottom of the rack, and a case is fixedly connected to the right side of the column frame. An injection system is arranged above the case, and a die casting mechanism is arranged on the left side of the injection system; the die-casting mechanism comprises a die closing unit and a discharging unit. The mold closing unit comprises guide columns, a movable mold, a fixed mold and a hydraulic cylinder, and the four guide columns are fixedly connected to the periphery of the interior of the rack. According to the precise positioning device in the magnesium alloy part die-casting process, the falling buffer structure below the rack can effectively absorb and disperse impact force generated when parts fall by utilizing the synergistic effect of the springs, the supporting rods, the buffer disc and other parts, the parts are prevented from being damaged due to direct impact on the ground, and the integrity and surface quality of the parts are ensured.

Description

Technical Field

[0001] This utility model relates to the field of magnesium alloy parts die casting technology, specifically a precision positioning device in the magnesium alloy parts die casting process. Background Technology

[0002] Magnesium alloys are metallic materials with many excellent properties. They have moderate density, high specific strength and specific stiffness, good dimensional stability, excellent electromagnetic shielding performance, strong corrosion resistance, and significant vibration damping effect. Furthermore, magnesium alloys have good machinability, are easy to process, and have low cost, as well as excellent mold flowability. However, magnesium alloys are more prone to oxidation and combustion and hot cracking than aluminum alloys during casting, which makes the melting, pouring, and die-casting mold temperature control more complex.

[0003] When the mold is pushed down by the ejector pin and falls directly without a cushioning device, the part will collide hard with the receiving surface below or other components. This may cause scratches, dents and other damage to the surface of the part, affecting its appearance quality. For some magnesium alloy parts with high surface quality requirements, such as appearance parts, this damage may render the part unusable.

[0004] To address this issue, we propose a precision positioning device for the die-casting process of magnesium alloy parts. Utility Model Content

[0005] The purpose of this invention is to provide a precise positioning device for the die-casting process of magnesium alloy parts, so as to solve the problem mentioned in the background art that the hard collision between the part and the underlying bearing surface may cause scratches on the surface of the part.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a precision positioning device for die casting magnesium alloy parts, comprising a frame and slide rails arranged on the front and rear sides of the frame, a protective door slidably connected to the slide rails, a column frame fixedly connected to the bottom of the frame, a housing fixedly connected to the right side of the column frame, an injection system arranged above the housing, and a die casting mechanism arranged on the left side of the injection system;

[0007] The die-casting mechanism includes a mold-closing unit and a material-unloading unit;

[0008] The mold-closing unit includes guide pillars, a moving mold, a fixed mold, and a hydraulic cylinder. There are four guide pillars, which are fixedly connected to the four sides of the machine frame. The four sides of the moving mold are slidably connected to the guide pillars through sliding sleeves. The output end of the hydraulic cylinder is connected to the two left sides of the moving mold, and the other end of the hydraulic cylinder is connected to the left side of the machine frame. The four sides of the fixed mold are fixedly connected to the right end of the guide pillars. The right side of the fixed mold is connected to the discharge port of the injection system through a transport pipe.

[0009] Preferably, the feeding unit includes a bracket and an ejector pin. The bracket is located in the middle of the four guide pillars. The right side of the bracket is connected to one end of the ejector pin, and the other end of the ejector pin faces the moving mold. After the magnesium alloy part is formed in the die-casting mechanism, the ejector pin can be used to eject the formed part from the moving mold to realize the automatic feeding function.

[0010] Preferably, the bottom surface of the frame is continuous, and a drop buffer structure is provided below the frame. The drop buffer structure includes an inclined support plate, a support rod, a buffer plate, a connecting seat, a sliding rod, a spring, a sliding seat, and a fixed seat. The bottom of the inclined support plate is fixedly connected to the column frame. The connecting seat and the fixed seat are respectively fixedly connected to the front and rear sides of the upper surface of the inclined support plate. Two sets of connecting seats are respectively arranged on the front sides of the inclined support plate, and two sets of fixed seats are respectively fixedly connected to the back sides of the inclined support plate. The sliding rod is respectively arranged inside the two connecting seats, and the spring is arranged on the outside of the sliding rod. The other end of the spring is connected to the sliding seat. The bottom of the support rod is respectively hinged to the sliding seat and the fixed seat. The middle part of the support rod is rotatably connected through a rotating shaft, and the top of the support rod is hinged to the bottom of the buffer plate. When the part is ejected from the mold and falls, the buffer plate first contacts the part. When the buffer plate is impacted, it will press down on the support rod. The support rod drives the sliding seat to slide on the sliding rod and compress the spring. The elastic deformation of the spring absorbs and disperses the impact force of the falling parts, preventing them from being damaged by direct impact with the ground, thus ensuring the integrity and surface quality of the parts.

[0011] Preferably, the buffer disc is made of wear-resistant and elastic rubber material. The elasticity of the rubber material can better absorb and buffer the impact force of the falling parts, and can more effectively protect the parts from damage compared with rigid materials.

[0012] Preferably, the transport pipe is provided with an insulation structure on its outer side. This insulation structure includes a heat insulation layer and a heating layer. The heat insulation layer is made of ceramic fiber material wrapped around the outside of the transport pipe, and the heating layer is made of electric heating wire wound around the outside of the heat insulation layer. Ceramic fiber has extremely low thermal conductivity, effectively preventing heat loss from the molten magnesium alloy inside the transport pipe, thus reducing heat loss and energy consumption. The heating layer, made of electric heating wire wound around the outside of the heat insulation layer, allows the electric heating wire to be energized and heated when the temperature of the molten metal inside the transport pipe drops, compensating for the temperature drop and ensuring that the molten magnesium alloy maintains a suitable temperature and good fluidity throughout the transport process. This ensures that the molten metal smoothly enters the die-casting mold, improving the forming quality of the die-cast parts and reducing defects such as cold shuts and porosity caused by changes in molten metal temperature.

[0013] Preferably, the outer surface of the protective door is provided with a transparent observation window, which is made of high-strength tempered glass. The transparent observation window allows operators to observe the working conditions inside the die-casting mechanism at any time without opening the protective door.

[0014] Preferably, the contact surfaces of the moving mold and the fixed mold are provided with positioning pins and positioning holes. The positioning pins are fixedly connected to the moving mold, and the positioning holes are opened at the corresponding positions of the fixed mold. The positioning pins are inserted into the positioning holes, which restricts the relative displacement of the moving mold and the fixed mold in the horizontal and vertical directions, ensuring accurate docking of the mold cavity.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The precision positioning device in the die-casting process of this magnesium alloy part, and the falling buffer structure under the frame, utilize the synergistic effect of components such as springs, support rods, and buffer discs to effectively absorb and disperse the impact force of the falling part, preventing the part from being damaged due to direct impact with the ground, and ensuring the integrity and surface quality of the part.

[0017] 2. The precision positioning device in the die-casting process of this magnesium alloy part, with positioning pins and positioning holes set on the contact surfaces of the moving mold and the fixed mold, effectively limits the relative displacement of the moving mold and the fixed mold in the horizontal and vertical directions by inserting the positioning pins into the positioning holes, thus ensuring accurate docking of the mold cavity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall side structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall front structure of this utility model;

[0020] Figure 3 This is a top view of the overall structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the ejection structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the fall buffer structure of this utility model.

[0023] In the diagram: 1. Frame, 101. Protective door, 102. Slide rail, 2. Injection system, 201. Transport pipe, 3. Chassis, 401. Guide column, 402. Moving mold, 403. Fixed mold, 404. Hydraulic cylinder, 405. Bracket, 406. Ejector pin, 5. Drop buffer structure, 501. Inclined support plate, 502. Support rod, 503. Buffer plate, 504. Connecting seat, 505. Slide rod, 506. Spring, 507. Sliding seat, 508. Fixed seat, 6. Column frame. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0025] To address the issue of insufficient positioning accuracy between the moving and fixed molds during the die-casting process of magnesium alloy parts, which leads to large dimensional deviations and unstable quality, please refer to [the relevant documentation]. Figures 1-5 This utility model provides a technical solution: a precision positioning device for die-casting magnesium alloy parts, comprising a frame 1 and slide rails 102 arranged on the front and rear sides of the frame 1. A protective door 101 is slidably connected to the slide rails 102, and a transparent observation window is provided on the outer surface of the protective door 101. The slide rails 102 allow the protective door 101 to be easily opened and closed, facilitating operation and observation. A column frame 6 is fixedly connected to the bottom of the frame 1, and a housing 3 is fixedly connected to the right side of the column frame 6. An injection system 2 is arranged above the housing 3, responsible for injecting molten magnesium alloy into the mold, and is the core component of the die-casting process. A die-casting mechanism is arranged on the left side of the injection system 2; the die-casting mechanism includes a mold closing unit and a material unloading unit.

[0026] The mold-closing unit includes guide pillars 401, a moving mold 402, a fixed mold 403, and a hydraulic cylinder 404. Four guide pillars 401 are fixedly connected to the four sides of the machine frame 1. The moving mold 402 is slidably connected to the guide pillars 401 via sliding sleeves. The output end of the hydraulic cylinder 404 is connected to the two left sides of the moving mold 402, and the other end of the hydraulic cylinder 404 is connected to the left side of the machine frame 1. The fixed mold 403 is fixedly connected to the right end of the guide pillars 401. The right side of the fixed mold 403 is connected to the discharge port of the injection system 2 via a transport pipe 201. Positioning pins and positioning holes are provided on the contact surfaces of the moving mold 402 and the fixed mold 403. The positioning pins are fixedly connected to the moving mold 402, and the positioning holes are opened at corresponding positions on the fixed mold 403. The positioning pins are inserted into the positioning holes, and the guide pillars 401 ensure precise alignment of the moving mold 402 and the fixed mold 403. Hydraulic cylinder 404 provides power, enabling the moving mold 402 to smoothly approach or move away from the fixed mold 403 to form the desired mold cavity. The design of locating pins and locating holes further enhances the precise alignment and stability of the mold. An insulation structure is provided on the outside of the transport pipe 201, comprising a heat insulation layer and a heating layer. The heat insulation layer is made of ceramic fiber material wrapped around the outside of the transport pipe 201, and the heating layer is made of electric heating wire wound around the outside of the heat insulation layer. This prevents the molten metal from cooling during transport, ensuring the quality of die casting. Example

[0027] Based on Example 1, in order to solve the problem that the parts are easily damaged and the scrap rate is high after demolding in the existing magnesium alloy parts die casting process due to the lack of effective material feeding and buffering measures, the material feeding unit includes a bracket 405 and an ejector pin 406. The bracket 405 is located in the middle of the four guide pillars 401. The right side of the bracket 405 is connected to one end of the ejector pin 406, and the other end of the ejector pin 406 faces the moving mold 402.

[0028] The bottom surface of the frame 1 is open, and a drop buffer structure 5 is provided below the frame 1. The drop buffer structure 5 includes an inclined support plate 501, a support rod 502, a buffer plate 503, a connecting seat 504, a slide rod 505, a spring 506, a sliding seat 507, and a fixed seat 508. The bottom of the inclined support plate 501 is fixedly connected to the column frame 6. The connecting seat 504 and the fixed seat 508 are respectively fixedly connected to the front and rear sides of the upper surface of the inclined support plate 501. There are two sets of connecting seats 504 respectively provided on the inclined support plate. On both sides of the front of plate 501, two sets of fixed seats 508 are fixedly connected to the two sides of the back of the inclined support plate 501. Slide rods 505 are respectively set inside the two connecting seats 504. Springs 506 are set on the outside of slide rods 505, and the other end of springs 506 is connected to sliding seats 507. The bottom of support rods 502 is hinged to sliding seats 507 and fixed seats 508 respectively. The middle of support rods 502 is rotatably connected by a rotating shaft. The top of support rods 502 is hinged to the bottom of buffer discs 503. Buffer discs 503 are made of wear-resistant and elastic rubber material. When the part is ejected from the mold and falls, buffer discs 503 first contact the part. When buffer discs 503 are impacted, they will press down on support rods 502. Support rods 502 drive sliding seats 507 to slide on slide rods 505 and compress springs 506. The elastic deformation of spring 506 absorbs and disperses the impact force of the falling part, preventing the part from being damaged by direct impact with the ground, and ensuring the integrity and surface quality of the part.

[0029] Working Principle: Operators can open or close the protective door 101 via the slide rail 102 as needed. When mold making is required, the injection system 2 is started first. The injection system 2 is the power source for the entire die casting process, responsible for injecting the molten magnesium alloy into the mold cavity of the die casting mechanism through the transport pipe 201 at a certain pressure and speed. The heat insulation structure on the outside of the transport pipe 201 utilizes the extremely low thermal conductivity of ceramic fibers in the insulation layer to reduce heat loss to the outside; the electric heating wire in the heating layer can be energized when necessary to compensate for heat loss, ensuring that the molten magnesium alloy maintains a suitable temperature and good fluidity during transmission, thus guaranteeing the quality of die casting.

[0030] The guide post 401 guides the movement of the moving mold 402, which slides smoothly on the guide post 401 via a sliding sleeve. The hydraulic cylinder 404, as the power unit, is connected to the moving mold 402 at its output end. Through its extension and retraction, the moving mold 402 moves closer to or further away from the fixed mold 403. When the hydraulic cylinder 404 extends, the moving mold 402 moves towards the fixed mold 403 until the locating pin inserts into the locating hole, achieving precise alignment and tight fit between the moving mold 402 and the fixed mold 403, forming a closed mold cavity that provides space for the injection and molding of the magnesium alloy liquid.

[0031] After the magnesium alloy part cools and solidifies in the mold cavity, the hydraulic cylinder 404 contracts, causing the moving mold 402 to move to the left. The ejector pin 406 pushes the formed part out of the moving mold 402, realizing the automatic unloading function. As the part falls from the mold, it first contacts the buffer plate 503. The buffer plate 503 is made of wear-resistant and elastic rubber material, which can initially absorb some of the impact force. After being impacted, the buffer plate 503 presses downward against the support rod 502. The middle part of the support rod 502 rotates via a pivot, simultaneously causing the sliding seat to slide on the slide rod 505, compressing the spring 506. The elastic deformation of the spring 506 further absorbs and disperses the impact force of the falling part, preventing damage from direct impact with the ground and ensuring the integrity and surface quality of the part.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A precision positioning device in the process of magnesium alloy parts die casting, comprising a rack (1) and a slide rail (102) arranged on the front and back sides of the rack (1), characterized in that: A protective door (101) is slidably connected to the slide rail (102), a column frame (6) is fixedly connected to the bottom of the frame (1), a housing (3) is fixedly connected to the right side of the column frame (6), an injection system (2) is provided above the housing (3), and a die-casting mechanism is provided on the left side of the injection system (2). The die-casting mechanism includes a mold-closing unit and a material-unloading unit; The mold-closing unit includes guide pillars (401), moving mold (402), fixed mold (403), and hydraulic cylinder (404). Four guide pillars (401) are fixedly connected to the four sides of the machine frame (1). The four sides of the moving mold (402) are slidably connected to the guide pillars (401) through sliding sleeves. The output end of the hydraulic cylinder (404) is connected to the two left sides of the moving mold (402), and the other end of the hydraulic cylinder (404) is connected to the left side of the machine frame (1). The four sides of the fixed mold (403) are fixedly connected to the right end of the guide pillars (401), and the right side of the fixed mold (403) is connected to the discharge port of the injection system (2) through a transport pipe (201).

2. A precision positioning device for magnesium alloy parts during die casting process as claimed in claim 1 wherein: The feeding unit includes a bracket (405) and an ejector pin (406). The bracket (405) is located in the middle of four guide pillars (401). The right side of the bracket (405) is connected to one end of the ejector pin (406), and the other end of the ejector pin (406) faces the moving mold (402).

3. A precision positioning device for magnesium alloy parts during die casting process as claimed in claim 1 wherein: The bottom surface of the frame (1) is open, and a drop buffer structure (5) is provided below the frame (1). The drop buffer structure (5) includes an inclined support plate (501), a support rod (502), a buffer plate (503), a connecting seat (504), a sliding rod (505), a spring (506), a sliding seat (507), and a fixed seat (508). The bottom of the inclined support plate (501) is fixedly connected to the column frame (6). The connecting seat (504) and the fixed seat (508) are respectively fixedly connected to the front and rear sides of the upper surface of the inclined support plate (501). There are two sets of connecting seats (504) respectively provided on the inclined support plate (501). On both sides of the front of the support plate (501), the fixed seat (508) has two sets of fixed connections to the back sides of the inclined support plate (501). The sliding rod (505) is respectively set inside the two connecting seats (504). The spring (506) is set outside the sliding rod (505). The other end of the spring (506) is connected to the sliding seat (507). The bottom of the support rod (502) is respectively hinged to the sliding seat (507) and the fixed seat (508). The middle part of the support rod (502) is rotatably connected through a rotating shaft. The top of the support rod (502) is hinged to the bottom of the buffer plate (503).

4. The precision positioning device for die-casting magnesium alloy parts according to claim 3, characterized in that: The buffer disc (503) is made of wear-resistant and elastic rubber material.

5. The precision positioning device for die-casting magnesium alloy parts according to claim 1, characterized in that: The transport pipe (201) is provided with a heat insulation structure on the outside. The heat insulation structure includes a heat insulation layer and a heating layer. The heat insulation layer is wrapped with ceramic fiber material on the outside of the transport pipe (201), and the heating layer is wrapped with electric heating wire on the outside of the heat insulation layer.

6. The precision positioning device for die-casting magnesium alloy parts according to claim 1, characterized in that: The outer surface of the protective door (101) is provided with a transparent observation window.

7. The precision positioning device for die-casting magnesium alloy parts according to claim 1, characterized in that: The contact surfaces of the moving mold (402) and the fixed mold (403) are provided with positioning pins and positioning holes. The positioning pins are fixedly connected to the moving mold (402), and the positioning holes are opened at the corresponding positions of the fixed mold (403). The positioning pins are inserted into the positioning holes.

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