Aluminum alloy die-casting equipment with adjustable sectional cooling mechanism

Abstract

The invention relates to the field of die-casting process control, and discloses aluminum alloy die-casting equipment with an adjustable sectional cooling mechanism, which comprises a die-casting die, an electric control valve, a temperature sensor and a controller. A plurality of cooling channel sections are arranged on at least one side (a movable die or a fixed die) in the die-casting die, are distributed along a hot spot area of a die cavity and are respectively connected to an electric control valve which can be independently controlled. The temperature sensors are installed at outlets of all the channel sections and used for collecting the local temperature of the mold in real time and feeding back the local temperature to the controller. A cooling strategy configuration table is arranged in the controller and used for setting the water passing threshold value, the holding time and the control sequence of each section, and control parameters are dynamically adjusted according to actual temperature feedback, so that sectional cooling and closed-loop adjustment of different areas of the mold are achieved. The equipment is suitable for cooling control over the aluminum alloy die with wall thickness difference and a multi-hot-spot structure, the compactness of a casting and the die temperature balance can be effectively improved, and good engineering practicability and intelligent control capacity are achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of die casting equipment, in particular to an aluminum alloy die casting equipment with an adjustable segmented cooling mechanism, which is suitable for the rapid cooling and dense forming process of an aluminum alloy mold with multiple hot spot regions. BACKGROUND

[0002] Aluminum alloy die casting technology is widely used in the fields of automobiles, aviation and electronics. Traditional die casting equipment often adopts a mold overall circulation cooling method, which cools the mold cavity as a whole by introducing cooling water through heat exchange pipes. However, in the actual die casting process, the mold cavity structure is complex, the wall thickness is uneven, and the cooling rate of each region of the hot spot is inconsistent, which can easily cause slow solidification in some regions, thermal stress concentration, and further cause casting deformation, shrinkage, porosity and other quality defects.

[0003] In the prior art, although there are feeding devices or cooling water circulation systems, it is difficult to achieve independent temperature control of each region of the mold, and there is a lack of real-time adjustment capability for the cooling strategy of each segment. Therefore, there is an urgent need for an improved die casting equipment with the functions of "structure segmentation + cooling controllability + control closed loop". SUMMARY

[0004] The purpose of the present application is to provide an aluminum alloy die casting equipment with an adjustable segmented cooling mechanism, which can implement differentiated cooling control of different regions of the mold cavity, and realize cooling precision regulation and control for the multi-hot spot structure through the sensor-controller-valve closed loop, so as to improve the quality and density of the die casting.

[0005] To achieve the above purpose, the application adopts the following technical scheme:

[0006] An aluminum alloy die casting equipment with an adjustable segmented cooling mechanism, comprising a die casting table, a movable die table and a fixed die table fixedly arranged above the die casting table, wherein the movable die table and the fixed die table are oppositely arranged to form a mold cavity;

[0007] At least one of the fixed die table and the movable die table is internally provided with a plurality of cooling channel segments, and each cooling channel segment is distributed along different regions of the mold cavity;

[0008] The water inlet and the water outlet of each cooling channel segment are respectively connected to a main cooling water supply system through an electric control valve;

[0009] The electric control valve is fixedly installed on the side of the die casting table or the pipeline connected to the cooling channel, and the electric control valve is electrically connected to the controller;

[0010] The controller is installed on one side of the die casting table and is used to receive signals fed back by temperature sensors corresponding to each cooling channel segment;

[0011] The controller controls the opening time or opening degree of each electric control valve according to a preset cooling strategy, so that the different regions in the mold cavity are subjected to segmented and regulated cooling.

[0012] The cooling channel segments are respectively located in the corresponding thick wall region, edge region and center region of the mold cavity, so that each region receives cooling water flow with different intensities during the aluminum alloy die casting cooling process.

[0013] Further, the cooling channel segments are longitudinally arranged in the up-down direction of the mold cavity, and each segment is provided with an independent water inlet and outlet, which are connected with external heat exchange pipes through detachable interfaces.

[0014] Further, the temperature sensor is installed at the water outlet of the corresponding cooling channel segment, and is connected in a closed loop with the controller through a signal cable, for real-time monitoring of the outlet temperature of the cooling water.

[0015] Further, the controller is pre-set with three strategies of sequential cooling mode, parallel cooling mode and hot spot priority cooling mode, and a user can select and switch the control logic through a human-machine interface.

[0016] Further, the electric control valve is a proportional regulating type valve, and the opening degree thereof is dynamically adjusted by the controller according to the feedback signals collected by the temperature sensor, and the control signal is a PWM or analog voltage control signal, so as to realize precise adjustment of the cooling flow.

[0017] Further, the inner wall of the cooling channel segment is in a corrugated structure or is provided with a spiral flow guide rib (45), for prolonging the water flow path and enhancing the heat exchange efficiency between the cooling water and the mold metal.

[0018] Further, the controller is a programmable logic controller (PLC) or an industrial grade MCU module, and is externally connected with a data interface for reading the real-time temperature curve and historical operation parameters of the cooling segment.

[0019] Further, the signal cable between the temperature sensor and the controller is laid through an embedded cable groove arranged on the side of the die casting table, and is connected in a conductive manner through a sliding rail type contact before the mold table and the fixed mold table are closed.

[0020] Further, a cooling main pump and a constant temperature water tank are arranged below the die casting table, the constant temperature water tank is used to provide cooling water with constant temperature to different cooling channel segments, and the flow control module is used to uniformly adjust and independently control the water supply flow of each cooling segment.

[0021] The beneficial effects of the present application are:

[0022] 1. The aluminum alloy die casting equipment with adjustable segmented cooling mechanism, through multiple independent cooling channel segments and electric control valves, realizes differentiated cooling of different thermal section areas, and significantly reduces the defect occurrence rate of shrinkage holes, cracks and the like.

[0023] 2. The aluminum alloy die casting equipment with adjustable segmented cooling mechanism, the controller can set multiple cooling modes, and is flexible in configuration for different casting structures, and is strong in adaptability.

[0024] 3. The aluminum alloy die casting equipment with adjustable segmented cooling mechanism, the temperature sensor feeds back the cooling state of each section of the mold in real time, the controller dynamically adjusts the opening degree of the electric control valve, and the response speed and stability of the cooling system are improved.

[0025] 4. The aluminum alloy die casting equipment with adjustable segmented cooling mechanism, the structure of the present application is mainly composed of existing industrial control elements, and has good engineering implementability and maintenance convenience. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the overall structure schematic diagram of the present application;

[0027] Figure 2 is the distribution structure diagram of the cooling channel section in the present application;

[0028] Figure 3 is the connection structure schematic diagram of the cooling channel and the electric control valve in the present application;

[0029] Figure 4 is the connection relationship diagram between the controller and the temperature sensor, valve in the present application;

[0030] Figure 5 is the control logic flow chart and cooling strategy configuration field combined schematic diagram in the present application;

[0031] Figure 6 is the cross-sectional structure diagram of the cooling channel in the mold in the present application;

[0032] Figure 7 is the local enlarged view of the cable sliding guide structure in the present application;

[0033] Figure 8 is the structure schematic diagram of the man-machine interface display layout in the present application.

[0034] In the figure: 1, die casting platform; 2, moving die platform; 3, fixed die platform; 4, cooling channel section; 5, electric control valve; 6, main cooling water supply system; 7, controller; 71, human-machine interface; 72, MCU or PLC module; 73, data interface; 8, temperature sensor; 81, signal cable; 9, heat exchange pipe; 10, cooling main pump; 11, embedded cable groove; 12, constant temperature water tank; 13, flow control module; 31, mold cavity; 41, cooling water inlet; 42, cooling water outlet; 43, detachable interface; 44, corrugated inner wall structure; 45, spiral guide rib. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than 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.

[0036] The specific structure and working process of the present application will be further described below in combination with the drawings and embodiments. It should be understood that the described embodiments are only used to illustrate the present application, and are not limited to the scope of protection of the present application.

[0037] In order to more clearly illustrate the present application, a preferred embodiment of the present application will be described in detail in combination with the drawings:

[0038] Please refer to Figures 1 to 8 The present application provides an aluminum alloy die casting equipment with adjustable segmented cooling mechanism, comprising a die casting platform 1, a moving die platform 2 and a fixed die platform 3 are sequentially installed above the die casting platform 1, and the mold cavity 31 is formed after the two are combined. The inner part of at least one of the fixed die platform 3 and the moving die platform 2 is provided with a plurality of cooling channel sections 4 corresponding to a plurality of hot spot areas of the aluminum alloy casting, such as thick wall area, edge area, center bone position, etc. The cooling channel sections 4 are distributed along different areas of the mold cavity 31. Here, the "cooling channel section" refers to an independent cooling partition respectively arranged corresponding to different hot spot areas in the mold cavity. Each section has independent water inlet and outlet and control loop, which are parallel physical subsystems to avoid confusion with terms such as "channel group" and "sub-flow channel". Preferably, no less than 3 sections are provided, commonly such as A section ~ C section, and more cooling sections can also be configured according to the mold structure, arranged in sequence in the up-down direction, such as shown in Figure 2 .

[0039] Each channel section 4 is provided with a water inlet 41 and a water outlet 42, which are respectively connected to the main cooling water supply system 6. Each water inlet 41 is connected to the circulating water system composed of the constant temperature water tank 12 and the cooling main pump 10 through an electric control valve 5. The electric control valve 5 is fixed on the side of the die-casting table 1 or the pipe section leading out of the cooling channel. Specifically, it is a proportional regulation valve that responds to PWM signals or 0-10V analog voltage control input. The system control module supports 8-bit PWM output, and the adjustment accuracy can reach 256 levels. An analog voltage adjustment interface with a control accuracy of ±0.1V can also be selected. The specific signal form can be configured through the human-machine interface menu. The cooling water is connected to the interior of the channel section 4 through the heat exchange tube 9. The inner wall of the channel is provided with a corrugated structure 44 or a spiral guide rib 45 to extend the flow path and enhance the heat exchange efficiency. Figure 6 shown.

[0040] A temperature sensor 8 is installed at the water outlet 42 of each cooling channel section 4 and is connected to the controller 7 via a signal cable 81 to form a closed-loop feedback system. Figure 4 As shown. The controller 7 is preferably a PLC module or an industrial MCU module 72, and is externally connected to a human-machine interface 71 and a data interface 73, which can read the sensor feedback temperature in real time, and configure cooling parameters and switch control strategies. The controller has preset strategies such as sequential cooling, parallel cooling and hot section priority cooling, among which the hot section priority strategy executes the priority cooling logic according to the temperature threshold, priority, delayed start time and other fields of each section in the preset configuration table. An example of the configuration table field is as follows: including the cooling section number (such as A, B, C), the starting temperature threshold (Tstart), the cooling hold time (HoldTime), the priority (Priority), and the dependent section number (Dependency). The controller reads the table line by line and dynamically adjusts the water flow order and duration of each section in combination with the real-time temperature. The control strategy can be selected through the human-machine interface 71. The interface includes a strategy setting area, a real-time temperature curve display area, an alarm button area, etc., as shown Figure 8 shown.

[0041] To ensure reliable signal transmission during mold closing, the signal cable 81 is routed through the built-in cable duct 11 on the side of the die-casting table 1, and the conductive connection between the movable die table 2 and the fixed die table 3 is achieved through a sliding guide rail contact. This contact structure includes a fixed guide rail slide, an elastic silver-plated contact piece, and a pre-stressed spring component. Before mold closing, the movable die table is inserted into the internal slide of the die-casting table and the contact surface is pressed. Signal conduction is completed when power is applied, and it automatically separates when the mold is disconnected. It has strong shock resistance and high-frequency conduction stability. Figure 7 The constant temperature water tank 12 is also provided with a flow control module 13 for regulating and independently controlling the water supply flow of each cooling channel section 4 under equal pressure, and a proportional variable frequency pump or an independent pressure regulating valve can be used in conjunction with it.

[0042] In practical application, taking the hot spot priority cooling strategy as an example: after the mold is closed, the controller initializes to receive sensor signals and judges the temperature change of each zone according to the priority, if the A section (thick wall zone) reaches 45 DEG C first, the controller immediately opens the electric control valve A, the cooling flow is set to 80%, and the temperature curve of the zone is displayed in real time on the man-machine interface, and the temperature is automatically turned off when it drops to 30 DEG C, and then the B section and C section are cooled, and the whole process is executed according to the configuration table. In a one-mold double-cavity forming project of a certain electric tool shell, the left cavity and the right cavity are configured as the B section and the C section respectively, and different threshold values are set by using parallel cooling strategy, and the controller independently adjusts according to the feedback of each section, so that the shell distortion is effectively inhibited and the cooling efficiency is improved. In another automobile die-casting support product, the difference between the thick wall and the edge wall is large, after using the cooling device of the application, the shrinkage rate is reduced from 8% to 2.3%, the density of the casting is improved to more than 98%, and the cooling adaptability and process stability of the application in complex hot spot structure die casting are effectively verified.

[0043] In practical application, according to the different mold structures and cooling requirements, the cooling channel section 4 can be arranged only in the fixed mold table 3, only in the movable mold table 2, or arranged in both, to meet different hot spot distribution conditions.

[0044] The application has clear structure, fine regulation and control, good engineering implementability, and is suitable for medium and large aluminum alloy molds with significant wall thickness difference and complex local hot spot distribution, especially suitable for precise die casting systems with segmented temperature control interface and feedback control, and can also be integrated with existing intelligent die casting control platforms.

[0045] The above shows and describes the basic principles, main features and advantages of the application. Those skilled in the art should understand that the application is not limited to the above examples, and the above examples and descriptions in the specification are only preferred examples of the application and are not intended to limit the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. An aluminum alloy die-casting device with an adjustable segmented cooling mechanism, comprising a die-casting table (1), a movable die table (2) and a fixed die table (3) fixedly arranged above the die-casting table (1), wherein the movable die table (2) and the fixed die table (3) are arranged relative to each other to form a die cavity (31), and is characterized in that: At least one of the fixed die table (3) and the movable die table (2) is provided with a plurality of cooling channel sections (4), and each cooling channel section (4) is distributed along different areas of the die cavity (31); The water inlet (41) and the water outlet (42) of each cooling channel section (4) are respectively connected to the main cooling water supply system (6) through the electric control valve (5); The electric control valve (5) is fixedly installed on the side of the die casting table (1) or on a pipe connected to the cooling channel (4), and the electric control valve (5) is electrically connected to the controller (7); The controller (7) is installed on one side of the die-casting table (1) and is used to receive feedback signals from the temperature sensors (8) corresponding to the cooling channel sections (4); The controller (7) controls the opening sequence or opening degree of each electrically controlled valve (5) according to a preset cooling strategy to achieve segmented controlled cooling of different areas in the mold cavity (31); The cooling channel sections (4) are respectively located in the thick wall area, edge area and center area of ​​the mold cavity (31) corresponding to the mold cavity, so that each area receives cooling water flow of different intensities as required during the aluminum alloy die-casting cooling process.

2. The aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism according to claim 1, characterized in that: The cooling channel sections (4) are arranged longitudinally in sequence along the upper and lower directions of the mold cavity (31), and each section is provided with an independent water inlet (41) and a water outlet (42), which are connected to the external heat exchange pipe (9) via a detachable interface (43).

3. The aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism according to claim 1, characterized in that: The temperature sensor (8) is installed at the water outlet (42) of the corresponding cooling channel section (4) and is connected to the controller (7) in a closed loop via a signal cable (81) for real-time monitoring of the cooling water outlet temperature.

4. The aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism according to claim 1, characterized in that: The controller (7) is preset with three strategies: sequential cooling mode, parallel cooling mode and hot-node priority cooling mode, and the user can select and switch the control logic through the human-machine interface (71).

5. According to the aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism as described in claim 1, the electric control valve (5) is a proportional regulation valve, and its opening is dynamically adjusted by the controller (7) according to the feedback signal collected by the temperature sensor (8), and the control signal is a PWM or analog voltage control signal to achieve precise adjustment of the cooling flow.

6. The aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism according to claim 1, characterized in that: The inner wall of the cooling channel section (4) is a corrugated structure (44) or is provided with spiral guide ribs (45), which are used to extend the water flow path and enhance the heat exchange efficiency between the cooling water and the mold metal.

7. The aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism according to claim 1, characterized in that: The controller (7) is a programmable logic controller (PLC) or an industrial-grade MCU module (72), and is connected to an external data interface (73) for reading the real-time temperature curve and historical operating parameters of the cooling section (4).

8. According to claim 3, an aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism, the signal cable (81) between the temperature sensor (8) and the controller (7) is laid through an embedded cable trough (11) provided on the side of the die-casting table (1), and the conductive connection is achieved through a sliding guide rail contact before the movable mold table (2) and the fixed mold table (3) are closed.

9. According to claim 1, an aluminum alloy die-casting equipment with an adjustable segmented cooling mechanism, a cooling main pump (10) and a constant temperature water tank (12) are provided under the die-casting table (1), the constant temperature water tank (12) is used to provide cooling water of constant temperature to different cooling channel sections (4), and the flow control module (13) is used to perform pressure equalization and independent control on the water supply flow of each cooling section.

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