Magnesium alloy semi-solid injection molding device

Abstract

The invention relates to the field of magnesium alloy forming devices, and discloses a magnesium alloy semi-solid injection forming device which comprises a material conveying barrel and a hopper used for feeding materials to the material conveying barrel, a first hot air channel is arranged in the hopper and used for heating the hopper, and a material conveying channel and a second hot air channel are arranged in the material conveying barrel. The first hot air channel is communicated with the second hot air channel, the second hot air channel is arranged around the material conveying channel, a rotatable material pushing screw rod is installed in the material conveying channel, the material pushing screw rod is provided with an arc-shaped baffle protruding in the radial direction, and the second hot air channel is intermittently opened or closed by rotating the arc-shaped baffle; the first hot air channel and the second hot air channel are communicated with each other, so that heating gas can naturally flow into a conveying barrel area from a hopper area, waste heat is fully utilized for stepped heating, energy waste is reduced, energy consumption is reduced, and heat energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnesium alloy forming device, and particularly to a magnesium alloy semi-solid injection molding device. BACKGROUND

[0002] In recent years, magnesium alloy semi-solid injection molding technology, as an advanced forming method between liquid casting and solid forging, has attracted widespread attention. This technology heats magnesium alloy to the solid-liquid two-phase region (usually 580-620°C) to form a semi-solid slurry with non-dendritic spherical structure, achieving near-net shaping of high-density and high-quality parts under low injection pressure, and significantly improving the mechanical properties and surface quality of products.

[0003] The existing magnesium alloy semi-solid injection molding device usually includes a hopper, a material conveying cylinder, a heating system and a screw propulsion mechanism. The hopper is used to store raw material particles, the material conveying cylinder is internally provided with a heating device to preheat and soften the material, and the material is pushed to the injection cavity by the rotating screw. However, in actual application, the following problems still exist: Firstly, the heating system and the material conveying process lack coordinated control. In the existing equipment, the heating area is fixed, and the hot air distribution cannot be dynamically adjusted according to the screw propulsion rhythm, which easily causes energy waste or insufficient heating. Especially in the intermittent feeding process, if the heating is continuous, the material is easy to overheat; and if the heating is stopped, the subsequent material may lag in temperature rise. Secondly, most devices do not have an effective hot air circulation path, and the high-temperature gas is directly discharged, which not only consumes high energy, but also is not conducive to the stable maintenance of the temperature field.

[0004] Therefore, it is urgent to provide a magnesium alloy semi-solid injection molding device with reasonable structure, uniform heating, energy saving and efficiency, and intelligent control capability, to improve the stability of the semi-solid forming process and the product quality. SUMMARY

[0005] The purpose of the present application is to provide a magnesium alloy semi-solid injection molding device to solve the problem that in the existing equipment, the heating area is fixed, and the hot air distribution cannot be dynamically adjusted according to the screw propulsion rhythm, which easily causes energy waste or insufficient heating, especially in the intermittent feeding process, if the heating is continuous, the material is easy to overheat; and if the heating is stopped, the subsequent material may lag in temperature rise; and most devices do not have an effective hot air circulation path, and the high-temperature gas is directly discharged, resulting in high energy consumption. The specific technical scheme is as follows: The application discloses a magnesium alloy semi-solid injection molding device, which comprises a feeding cylinder and a hopper for feeding the feeding cylinder, the interior of the hopper is provided with a first hot air channel for heating the hopper, the interior of the feeding cylinder is provided with a feeding channel and a second hot air channel, the first hot air channel is communicated with the second hot air channel, the second hot air channel is arranged around the feeding channel, a rotatable pushing screw is arranged in the feeding channel, the pushing screw is provided with radially protruding arc-shaped baffles, and the second hot air channel is opened or closed by rotating the arc-shaped baffles.

[0006] As one of the improvements of the above technical scheme, the central part of the pushing screw is in a cylindrical shape, and the included angle formed between the two ends of the arc-shaped baffles and the center of the pushing screw is 30-50°.

[0007] As one of the improvements of the above technical scheme, the hot air circulation device is further arranged, and the hot air circulation device is connected with the first hot air channel.

[0008] As one of the improvements of the above technical scheme, the first hot air channel is provided with a first inlet and a first outlet, the first inlet of the first hot air channel is connected with the hot air circulation device, and the second outlet of the first hot air channel is two in number and is connected with the hot air circulation device and the second hot air channel respectively.

[0009] As one of the improvements of the above technical scheme, the second hot air channel is provided with a second inlet and a second outlet, the second inlet of the second hot air channel is connected with the first outlet of the first hot air channel, and the second outlet of the second hot air channel is communicated with the outside of the feeding cylinder.

[0010] As one of the improvements of the above technical scheme, the second inlet and the second outlet of the second hot air channel are respectively provided with a first notch and a second notch on the side surface, the inner wall of the feeding channel is provided with an annular groove for accommodating the arc-shaped baffles, the first notch and the second notch are respectively communicated with the annular groove, and the tail end of the arc-shaped baffle is arranged in the first notch or the second notch.

[0011] As one of the improvements of the above technical scheme, the outlet of the arc-shaped baffle is provided with a sensing block, the sensing block is connected with the pushing screw, the feeding cylinder is provided with a proximity switch on the inner wall of the annular groove, the sensing block is used for cooperating with the proximity switch, and the proximity switch is signal-connected with the hot air circulation device.

[0012] As one of the improvements of the above technical scheme, the hot air circulation device is configured to have a strong output mode, in the strong output mode, the hot air circulation device increases the output within 1-5 seconds, and the hot air circulation device starts the strong output mode in response to the sensing block triggering the proximity switch.

[0013] As one of the improvements of the above technical solutions, a mold is arranged at the front end of the feeding cylinder, and a displacement mechanism is arranged at the bottom of the mold.

[0014] As one of the improvements of the above technical solutions, a driving mechanism is arranged, and the output end of the driving mechanism is connected with the feeding screw.

[0015] The present application has the following advantages: the first hot air channel is arranged in the hopper, and the second hot air channel is arranged around the feeding channel in the feeding cylinder, thereby forming a full-range hot air heating structure from top to bottom and from outside to inside, effectively improving the temperature uniformity of the whole feeding path, ensuring that the magnesium alloy material is fully softened and reaches the ideal semi-solid state before entering the injection stage, the first hot air channel and the second hot air channel are in communication with each other, so that the heating gas can flow naturally from the hopper area to the feeding cylinder area, fully utilizing the waste heat for cascade heating, reducing energy waste, reducing energy consumption, and improving the heat energy utilization efficiency.

[0016] The feeding screw in the feeding channel can gradually push the material forward to the injection unit. In particular, the arc-shaped baffle on the feeding screw rotates synchronously with the feeding screw, part of the second hot air channel is arranged on the rotation path of the arc-shaped baffle, and the arc-shaped baffle has a corresponding notch for accommodating the arc-shaped baffle. By controlling the rotation angle of the feeding screw, the arc-shaped baffle can periodically open or close the second hot air channel (intercepted along a partial cross section), thereby realizing dynamic adjustment of the hot air on-off.

[0017] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the application. It is to be understood that not necessarily all objects or advantages described above can be achieved in accordance with any particular embodiment of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a structural schematic diagram of the present application.

[0020] Figure 2 is Figure 1 is an enlarged view of A of

[0021] Figure 3 is a structural schematic diagram of the arc-shaped baffle of the present application.

[0022] Fig. 1, feeding cylinder; 2, hopper; 3, first hot air channel; 4, second hot air channel; 5, pushing screw; 6, arc-shaped baffle; 7, hot air circulating device; 8, mold; 9, driving mechanism; 10, proximity switch; 11, induction block; 31, first inlet; 32, first outlet. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] In the prior art, the heating area is fixed, and the hot air distribution cannot be dynamically adjusted according to the pushing rhythm of the screw, which is prone to cause energy waste or insufficient heating. In particular, in the intermittent feeding process, if the heating is continued, the material is prone to be over-heated. If the heating is stopped, the subsequent material is prone to lag in temperature rise. Moreover, most devices do not have an effective hot air circulation path, and the high-temperature gas is directly discharged, resulting in high energy consumption. Please refer to Figures 1-3 The present application provides some embodiments to solve the above problems. A magnesium alloy semi-solid injection molding device comprises a feeding cylinder 1 and a hopper 2 for feeding the feeding cylinder 1. The inside of the hopper 2 is provided with a first hot air channel 3 for heating the hopper 2. The inside of the feeding cylinder 1 is provided with a feeding channel and a second hot air channel 4. The first hot air channel 3 and the second hot air channel 4 are in communication. The second hot air channel 4 is arranged around the feeding channel. A rotatable pushing screw 5 is installed in the feeding channel. The pushing screw 5 is provided with an arc-shaped baffle 6 protruding radially. The second hot air channel 4 is opened or closed intermittently by rotating the arc-shaped baffle 6.

[0025] The hopper 2 is mainly used for storing magnesium alloy raw materials, and the feeding cylinder 1 is used for heating and conveying the material. The hopper 2 is arranged at the upstream end of the feeding cylinder 1, and is used for continuously or intermittently feeding the feeding cylinder 1. The first hot air channel 3 is arranged along the side wall, which can preliminarily heat the magnesium alloy particles falling into the hopper 2, preventing the cold material from directly entering the high-temperature zone to cause thermal shock or temperature difference stress. The feeding cylinder 1 is internally provided with an axially extending feeding channel, which is used for containing and conveying the magnesium alloy material. The second hot air channel 4 is annular or spiral around the outer periphery of the feeding channel, forming a uniform cladding type heating structure. The first hot air channel 3 and the second hot air channel 4 are in communication with each other, forming a continuous hot air flow path, so that the heating medium (such as high-temperature air or inert gas) can flow from the hopper 2 area to the feeding cylinder 1 area, realizing efficient heat transfer in the whole path.

[0026] Specifically, by setting the first hot air channel 3 in the hopper 2 and the second hot air channel 4 surrounding the feeding channel in the feeding cylinder 1, a full-range hot air heating structure from top to bottom and from outside to inside is formed, which effectively improves the temperature uniformity of the entire feeding path, ensures that the magnesium alloy material is fully softened and reaches the ideal semi-solid state before entering the injection stage, and the first hot air channel 3 and the second hot air channel 4 are in communication with each other, so that the heating gas can flow naturally from the hopper 2 area to the feeding cylinder 1 area, fully utilize the waste heat for step-by-step heating, reduce energy waste, reduce energy consumption, and improve the efficiency of heat energy utilization.

[0027] The feeding screw 5 in the feeding channel can gradually push the material forward to the injection unit. In particular, the arc-shaped baffle 6 on the feeding screw 5 rotates synchronously with the feeding screw 5, part of the second hot air channel 4 is arranged on the rotation path of the arc-shaped baffle 6, and the arc-shaped baffle 6 is provided with a corresponding gap for accommodating the arc-shaped baffle 6. By controlling the rotation angle of the feeding screw 5, the arc-shaped baffle 6 can periodically open or close the second hot air channel 4 (intercepted along a partial cross section), thereby realizing dynamic adjustment of the hot air on-off.

[0028] The arc-shaped baffle 6 on the feeding screw 5 is used as a dynamic valve, which automatically opens or closes the second hot air channel 4 with the rotation of the screw, without the need for additional electric or pneumatic actuators, thereby simplifying the system structure, reducing the failure rate, and improving the operation stability. The action of the arc-shaped baffle 6 is synchronized with the operation of the feeding screw 5, and the heating is supplied during the material pushing process, and the heating is stopped or weakened during the pushing gap, thereby avoiding energy waste and material overburning risk caused by idle heating.

[0029] The overall design is compact, the hot air channels are reasonably arranged, and key components such as the feeding screw 5 and the arc-shaped baffle 6 are easy to disassemble and replace, which is suitable for daily maintenance under long-term continuous operation conditions.

[0030] In some embodiments, the central part of the feeding screw 5 is cylindrical, and the included angle between the two ends of the arc-shaped baffle 6 to the center of the feeding screw 5 is 30-50°. Specifically, by setting the angle between the two ends of the arc-shaped baffle 6 to be 30°-50°, the time ratio (duty cycle) of the hot air channel opening and closing can be accurately controlled in each rotation, so that the heating process is highly synchronized with the material pushing rhythm. For example: when the included angle is 40°, about 1 / 9 of a circle (40° / 360°) is in the "closed" state every time a circle is rotated, and the remaining time is kept "open", realizing precise and controllable hot air on-off period; If the angle between the two ends of the arc-shaped baffle 6 is too large (such as more than 60°), new hot air will be introduced and a large amount of hot air will be discharged for a long time during the rotation process, which is easy to cause the waste heat of the hot air to be discharged before being fully utilized, thereby causing resource waste; When the angle between the two ends of the arc-shaped baffle 6 is less than 30°, the arc-shaped baffle 6 covers too small an area, and in addition, the arc-shaped baffle 6 is in the process of rotation, which is easy to cause the amount of hot air entering the second hot air channel 4 to be too small, thereby affecting the heating effect and weakening the temperature control precision. Limiting the included angle between the two ends of the arc-shaped baffle 6 and the center of the screw to 30°-50° is the optimal design after comprehensively considering the hot air control precision and passability. This angle range not only ensures the effective phased closing of the hot air channel, but also does not affect the normal conveying of the material and the overall stability of the system.

[0031] As for the source of hot air, specifically, it further includes a hot air circulating device 7, which is connected with the first hot air channel 3 and can provide hot air for the first hot air channel 3 through the hot air circulating device 7, for example, a high-temperature fan integrated with a heater system for introducing high-temperature gas, In some embodiments, the first hot air channel 3 is provided with a first inlet 31 and a first outlet 32, the first inlet 31 of the first hot air channel 3 is connected with the hot air circulating device 7, the number of the second outlet of the first hot air channel 3 is two and is respectively connected with the hot air circulating device 7 and the second hot air channel 4, specifically, one branch is connected back to the hot air circulating device 7 to form a backflow branch; the other branch is connected to the second inlet of the second hot air channel 4 to constitute a main heat supply branch for supplying gas to the area of the feeding cylinder 1, the second hot air channel 4 is provided with a second inlet and a second outlet, the second inlet of the second hot air channel 4 is connected with the first outlet 32 of the first hot air channel 3, specifically, the second outlet of the second hot air channel 4 is in communication with the outside of the feeding cylinder 1.

[0032] Thus, a complete multi-path hot air flow network is constructed: hot air circulating device 7 → first inlet 31 → first hot air channel 3 (hopper 2 area) → divided into two paths: → one path returns to the hot air circulating device 7 (backflow) → the other path enters the second hot air channel 4 (feeding area) → finally discharged from the second outlet to the outside; This structure realizes the directional flow, on-demand distribution and partial recycling of hot air between different functional areas, forming an intelligent thermal management system with both heating efficiency and energy regulation ability.

[0033] In some embodiments, the first and second gaps are respectively arranged on the sides of the second inlet and the second outlet of the second hot air channel 4, and the inner wall of the material conveying channel is provided with an annular groove for accommodating the arc-shaped baffle 6, the first and second gaps are respectively communicated with the annular groove, and the end of the arc-shaped baffle 6 is arranged in the first gap or the second gap. Specifically, when the pushing screw 5 rotates, the arc-shaped baffle 6 on the pushing screw 5 rotates with the screw and slides in the annular groove, and the end of the arc-shaped baffle 6 can selectively extend into or separate from the first gap or the second gap. When the arc-shaped baffle 6 rotates to the position corresponding to the second inlet, the end of the arc-shaped baffle 6 enters the first gap, partially or completely shields the flow passage of the second inlet, thereby limiting the hot air from entering, avoiding the temperature being too high in the second hot air channel 4, and when the arc-shaped baffle 6 rotates to the position corresponding to the second outlet, the end of the arc-shaped baffle 6 enters the second gap, throttles or blocks the outlet airflow of the second hot air channel 4, thereby realizing the increase of the temperature in the second hot air channel 4.

[0034] The arc-shaped baffle 6 can act on the inlet and the outlet in different rotating stages, realize the double regulation and control functions of “inlet flow limiting and outlet throttling”, and significantly enhance the overall controllability of the hot air channel. The first and second gaps provide a directional embedding space for the arc-shaped baffle 6, so that the end of the arc-shaped baffle 6 can be deeply inserted into the side wall opening of the hot air channel to form a sealing structure similar to a “plug valve”. Compared with the gap shielding mode, the design greatly reduces the possibility of high-temperature gas flowing around the edge of the baffle, effectively improves the sealing performance of the hot air on-off, and avoids temperature out of control due to leakage.

[0035] In some embodiments, the outlet of the arc-shaped baffle 6 is provided with a sensing block 11 connected with the pushing screw 5, and the inner wall of the annular groove is provided with a proximity switch 10, and the sensing block 11 is used to cooperate with the proximity switch 10. The proximity switch 10 is signal connected with the hot air circulating device 7, and the hot air circulating device 7 is configured to have a strong output mode. In the strong output mode, the hot air circulating device 7 increases the output within 1-5 seconds, and the hot air circulating device 7 opens the strong output mode in response to the sensing block 11 triggering the proximity switch 10. Specifically, the sensing block 11 is arranged close to one end of the arc-shaped baffle 6, and after the sensing block 11 triggers the proximity switch 10, the second hot air channel 4 is randomly opened to inject high-temperature gas into the material conveying channel within a short time to compensate for the local temperature drop caused by the movement of the material. The design realizes the real-time linkage control between the mechanical motion state and the intensity of hot air supply, so that the heating process truly “follows” the material conveying rhythm, and achieves the temperature control target of precision, high efficiency and energy saving.

[0036] The present application can accurately identify the rotation phase of the arc-shaped baffle 6 (i.e. the pushing screw 5) through the mechanical position detection mechanism of the inductive block 11 and the proximity switch 10, thereby predicting the material pushing progress and starting the strong heat supply in advance at the key node, significantly shortening the response delay and improving the foresight and accuracy of temperature control.

[0037] After each pushing action, the cold or semi-softened material enters the high-temperature zone, which is easy to cause local heat absorption and temperature drop. The present application triggers the strong output mode for 1-5 seconds through the inductive signal, concentrates the high-energy hot air in a short time, quickly restores the target temperature range, prevents the problems such as the increase of material viscosity and the decrease of flowability caused by temperature drop, and guarantees the uniformity of semi-solid slurry organization.

[0038] The present application further comprises a mold 8 and a driving mechanism 9, the mold 8 is arranged at the front end of the material conveying cylinder 1, the bottom of the mold 8 is provided with a displacement mechanism, and the output end of the driving mechanism 9 is connected with the pushing screw 5.

[0039] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A magnesium alloy semi-solid injection molding device, characterized in that: It includes a feed cylinder and a hopper for feeding the feed cylinder, a first hot air channel is provided inside the hopper for heating the hopper, a feed channel and a second hot air channel are provided inside the feed cylinder, the first hot air channel is connected to the second hot air channel, the second hot air channel is arranged around the feed channel, a rotatable pushing screw is installed in the feed channel, the pushing screw is provided with a radially protruding arc baffle, and the second hot air channel is intermittently opened or closed by rotating the arc baffle.

2. A magnesium alloy semi-solid injection molding device according to claim 1, characterized in that: The central portion of the push screw is cylindrical, and the angle formed by the two ends of the arc-shaped baffle and the center of the push screw is 30-50 degrees.

3. The magnesium alloy semi-solid injection molding device according to claim 1, characterized in that: It also includes a hot air circulation device, which is connected to the first hot air channel.

4. The magnesium alloy semi-solid injection molding device according to claim 3, characterized in that: The first hot air channel is provided with a first inlet and a first outlet. The first inlet of the first hot air channel is connected to the hot air circulation device. There are two second outlets of the first hot air channel, which are respectively connected to the hot air circulation device and the second hot air channel.

5. The magnesium alloy semi-solid injection molding device according to claim 4, characterized in that: The second hot air channel is provided with a second inlet and a second outlet. The second inlet of the second hot air channel is connected to the first outlet of the first hot air channel. The second outlet of the second hot air channel is communicated with the outside of the feeding cylinder.

6. The magnesium alloy semi-solid injection molding device according to claim 5, characterized in that: A first notch and a second notch are respectively provided on the sides of the second inlet and the second outlet of the second hot air channel, and an annular groove is provided on the inner wall of the feed channel for accommodating the arc-shaped baffle. The first notch and the second notch are respectively connected to the annular grooves, and the end of the arc-shaped baffle is arranged in the first notch or the second notch.

7. The magnesium alloy semi-solid injection molding device according to claim 6, characterized in that: An induction block is provided in the outlet of the arc-shaped baffle, and the induction block is connected to the pushing screw. The feeding barrel is provided with a proximity switch on the inner wall of the annular groove. The induction block is used to cooperate with the proximity switch, and the proximity switch is connected to the signal of the hot air circulation device.

8. The magnesium alloy semi-solid injection molding device according to claim 7, characterized in that: The hot air circulation device is configured to have a strong output mode. In the strong output mode, the hot air circulation device increases the output within 1-5 seconds. The hot air circulation device turns on the strong output mode in response to the proximity switch being triggered by the sensing block.

9. The magnesium alloy semi-solid injection molding device according to claim 1, characterized in that: It also includes a mold, which is arranged at the front end of the feeding cylinder, and a displacement mechanism is provided at the bottom of the mold.

10. The magnesium alloy semi-solid injection molding device according to claim 1, characterized in that: It also includes a driving mechanism, wherein the output end of the driving mechanism is connected to the pushing screw.

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