Quick preheating and temperature homogenization control device and method for die-casting die

Abstract

The invention belongs to the field of die-casting dies, and particularly relates to a die-casting die rapid preheating and temperature homogenization control device and method.The die-casting die rapid preheating and temperature homogenization control device comprises a fixedly-arranged fixed die base and a movably-arranged movable die base, a traction column penetrates through the corner of the fixed die base and the corner of the movable die base, and the distance between the fixed die base and the movable die base is controlled by a hydraulic device to be adjusted; the displacement mechanism comprises rod frames symmetrically arranged on the fixed mold base, a screw rod penetrates through the middle of each rod frame, guide rods are arranged on the two sides of each screw rod, a lead screw sliding seat capable of transversely displacing is arranged on each screw rod and each guide rod, and a suspension plate penetrating into an open groove of the fixed mold base is connected to each lead screw sliding seat; the mold mechanism comprises a mold table mounted on the suspension plate; through synchronous partition heating of the multiple heating modules, the preheating time is shortened, and the problem that heating pipelines are inconvenient to arrange in the mold is solved; the temperature of each heating section of the die cavity is independently controlled, the distance adjusting mechanism dynamically adjusts the distance, the surface temperature difference of the die is controlled, and the casting yield is improved.

Description

Technical Field

[0001] The present invention relates to the field of die-casting dies, and in particular to a device and method for controlling rapid preheating and temperature uniformity of a die-casting die. Background Art

[0002] A die-casting mold is a tool used in the production of metal parts. Its core process combines the advantages of casting and die forging. Liquid or semi-liquid metal is injected into the mold cavity under high pressure and rapidly solidified under pressure. The basic process of die-casting is as follows: the molten metal is first cast into the mold cavity at a low or high speed. The mold has a movable cavity surface, which is pressurized and forged as the molten metal cools. This not only eliminates shrinkage defects in the blank, but also makes the internal structure of the blank reach the broken grains of the forged state, significantly improving the overall mechanical properties of the blank.

[0003] The preheating of die-casting molds relies on repeated die-casting to prepare the material liquid, which is time-consuming and energy-consuming. In addition, the overall heating inside the mold cannot accurately control the local temperature of the mold, resulting in large temperature differences on the cavity surface. The casting is prone to cold shut and shrinkage defects, and the deep cavity and thin-walled areas of complex molds are difficult to preheat effectively. Summary of the Invention

[0004] (1) Purpose of the invention

[0005] In order to solve the technical problems existing in the background technology, the present invention proposes a device for rapid preheating and temperature uniformity control of a die-casting mold, which has the characteristics of split preheating, zone preheating and uniform preheating.

[0006] (2) Technical solution

[0007] To solve the above technical problems, the present invention provides a die-casting mold rapid preheating and temperature uniformity control device, comprising a fixed fixed die base and a movable movable die base, wherein traction columns penetrate the corners of the fixed die base and the movable die base, and the distance between the two is controlled by a hydraulic device;

[0008] The displacement mechanism includes a rod frame symmetrically arranged on the fixed mold base, a screw rod passing through the middle of the rod frame, guide rods arranged on both sides of the screw rod, a screw slide capable of laterally displacement arranged on the screw rod and the guide rod, and a suspension plate penetrating the slot of the fixed mold base connected to the screw slide;

[0009] The mold mechanism includes a mold table installed on the hanging plate, a mold cavity is provided in the middle of the mold table, and a sealing plate is installed in the clamping groove of the mold table and the mold cavity;

[0010] The distance adjustment mechanism includes a preheating platform arranged outside the fixed die base, and a plurality of cylinders are installed at one end of the preheating platform facing the die cavity, and a movable piston rod is installed at the output end of the cylinder;

[0011] The preheating mechanism includes a heating module installed on the piston rod, and one end of the heating module that extends into the inner cavity of the mold cavity is formed with a heating element for preheating, and a temperature sensor for measuring temperature is installed on one side of the heating element.

[0012] Preferably, the screw is controlled to rotate by a servo motor, and the outer wall is provided with a screw slide that slides along the guide rod, and the combined structure of the screw slide and the suspension plate performs linear displacement synchronously.

[0013] Preferably, the fixed mold base and the movable mold base have the same structure, are provided with the same mold mechanism inside, and the mold cavities of the two are sealed when closed.

[0014] Preferably, at least one gate is provided at relative positions on the fixed mold base and the mold platform, and the gate penetrates through one end of the mold platform and extends into the inner cavity of the mold cavity.

[0015] Preferably, a track installed in the inner cavity of the fixed mold base is provided below the mold base, and a guide slide supporting the mold base is installed in the groove of the track.

[0016] Preferably, the cylinder is mounted on the preheating table via a cylinder rack with mounting holes, and one cylinder is adapted to one heating module.

[0017] Preferably, the mold cavity is divided into several heating zones, and a single heating zone is preheated non-contactly by the heating element, and the preheating interval is controlled by the telescopic adjustment of the piston rod. The preheating temperature is monitored by the temperature sensor, and the temperature sensor is also arranged in the inner cavity of the mold cavity to correspond to each heating zone.

[0018] Preferably, the constant temperature mechanism comprises a constant temperature device arranged on one side of the mold platform, and a circulation pipe is installed on the constant temperature device and extends into the clamping gap between the mold platform and the mold cavity.

[0019] Preferably, the constant temperature device moves synchronously with the mold platform, and the constant temperature device is connected to an external constant temperature device.

[0020] The present invention also provides a method for rapidly preheating and temperature homogenizing a die casting mold, comprising the following steps:

[0021] Step 1: Divide the mold cavity on the fixed mold base into heating zones, and match the distance adjustment mechanism and preheating mechanism corresponding to the divided zones;

[0022] Step 2: Perform the operation of step 1 on the mold cavity on the movable mold base;

[0023] Step 3: Before die-casting the workpiece, the die platforms of the fixed die base and the movable die base are respectively moved to the outside by a displacement mechanism to expose the die cavity to the outside;

[0024] Step 4: Adjust the piston rod in the cylinder of the distance adjustment mechanism to match the spacing of the heating intervals of the mold cavity, and insert the heating element of each heating module into the mold cavity to perform non-contact heating on the mold cavity;

[0025] Step 5: Monitor the temperature of the heating element and the corresponding heating zone of the mold cavity through the temperature measuring sensor. After the preheating temperature of each heating zone reaches the preset value, reset the mold cavity into the fixed mold base and the movable mold base to complete the preheating before die casting.

[0026] The above technical solution of the present invention has the following beneficial technical effects:

[0027] 1. Through synchronous zone heating by multiple heating modules, the preheating time is shortened and the problem of inconvenience in arranging heating pipes in the mold is solved;

[0028] 2. Each heating zone in the mold cavity is independently temperature-controlled, and the distance adjustment mechanism dynamically adjusts the distance to control the temperature difference on the mold surface and improve the casting yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 Schematic diagram of the displacement mechanism structure of the present invention;

[0031] Figure 3 It is a schematic diagram of the mold structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the mold platform moving structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the coordination structure of the distance adjustment mechanism and the preheating mechanism of the present invention;

[0034] Figure 6 It is a structural schematic diagram of the preheating mechanism of the present invention.

[0035] Reference numerals:

[0036] 11. Fixed mold base; 12. Moving mold base; 13. Pulling column; 14. Hydraulic device; 21. Rod holder; 22. Screw; 23. Guide rod; 24. Servo motor; 25. Screw slide; 26. Suspension plate; 31. Mold table; 32. Mold cavity; 33. Closing plate; 4. Track; 51. Preheating table; 52. Cylinder holder; 53. Cylinder; 54. Piston rod; 61. Heating module; 62. Heating element; 63. Temperature sensor; 71. Constant temperature device; 72. Circulation pipe. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0038] like Figure 1-6 As shown, the present invention proposes a die-casting mold rapid preheating and temperature uniformity control device, comprising a fixed fixed die base 11 and a movable movable die base 12. A traction column 13 penetrates the corners of the fixed die base 11 and the movable die base 12, and the distance between the two is controlled by a hydraulic device 14.

[0039] The displacement mechanism includes a rod frame 21 symmetrically arranged on the fixed mold base 11. A screw rod 22 is passed through the middle of the rod frame 21. Guide rods 23 are provided on both sides of the screw rod 22. A screw slide 25 capable of laterally displacement is provided on the screw rod 22 and the guide rod 23. A suspension plate 26 is connected to the screw slide 25 and is slotted into the fixed mold base 11.

[0040] The screw 22 is driven by a servo motor 24 and is provided with a screw slide 25 on its outer wall that slides along the guide rod 23. The combined structure of the screw slide 25 and the suspension plate 26 performs linear displacement synchronously, driving the mold mechanism connected to the suspension plate 26 to move on either the fixed mold base 11 or the movable mold base 12.

[0041] The mold mechanism includes a mold table 31 mounted on the suspension plate 26, a mold cavity 32 is provided in the middle of the mold table 31, and a sealing plate 33 is installed in the clamping groove between the mold table 31 and the mold cavity 32;

[0042] The distance adjustment mechanism includes a preheating platform 51 arranged outside the fixed mold base 11. A plurality of cylinders 53 are installed on one end of the preheating platform 51 facing the mold cavity 32. A movable piston rod 54 is installed on the output end of the cylinder 53.

[0043] The preheating mechanism includes a heating module 61 mounted on the piston rod 54 . One end of the heating module 61 that extends into the inner cavity of the mold cavity 32 is formed with a heating element 62 for preheating. A temperature sensor 63 for measuring temperature is installed on one side of the heating element 62 .

[0044] It should be noted that the fixed die base 11 and the movable die base 12 have the same structure and are equipped with the same mold mechanism inside. Before die-casting, the mold mechanism position of both can be adjusted through the same displacement mechanism, and the mold cavities of both can be preheated in a targeted manner through the distance adjustment mechanism and preheating mechanism in opposite directions. The two-way synchronous preheating can reduce the preparation time of the die-casting mold before die-casting. When the mold cavities 32 of the two are closed, they are sealed structures, and the material liquid is die-cast in the closed cavity.

[0045] In this embodiment, the original mold heating inside the mold base is improved to heating outside the mold base. The open space facilitates the work of the preheating mechanism. First, the servo motor 24 drives the screw slide 25 to move on the guide rod 23, driving the suspension plate 26 to move to the outside of the fixed mold base 11 along with the screw slide 25. At this time, the mold cavity 32 of the mold table 31 is exposed to the outside. Through the cooperation of the distance adjustment mechanism and the preheating mechanism, the cylinder 53 drives the piston rod 54 to extend, and the heating element 62 of the heating module 61 is inserted into the mold cavity 32 to preheat the mold cavity 32. Through the coordinated and synchronous zone heating of each heating module 61, the preheating time is shortened, and the preheating efficiency of the die-casting mold is effectively improved.

[0046] It can be understood that at least one gate is provided at the relative positions of the fixed mold base 11 and the mold base 31. The gate is provided at the fixed mold base 11 because the movable mold base 12 is a movable structure and needs to be provided with complex pipelines to adapt to the movement of the movable mold base 12. Therefore, in this application, a gate is provided at the fixed mold base 11. The gate penetrates one end of the mold base 31 and extends into the inner cavity of the mold cavity 32. During preheating, the heating can simultaneously cover the runner area to prevent the liquid from solidifying prematurely at the gate.

[0047] Alternatively, multiple gates may be provided to improve the efficiency of supplying liquid into the mold cavity 32 .

[0048] In order to ensure the stable sliding of the mold table 31, a track 4 installed in the inner cavity of the fixed mold base 11 is further provided under the mold table 31, and a guide slide supporting the mold table 31 is installed in the groove of the track 4. Because the mold table 31 is suspended and needs to be taken out or placed in the fixed mold base 11 for linear displacement during preheating, a guide slide that can slide along the groove of the track 4 is provided to support the bottom of the mold table 31, thereby effectively improving its stability during movement.

[0049] In order to facilitate the installation of the cylinder 53, the cylinder 53 is further installed on the preheating table 51 through a cylinder rack 52 with a mounting hole. One cylinder 53 is adapted to one heating module 61. The cylinder 53 is installed on the cylinder rack 52 in a modular manner. When any cylinder 53 or heating module 61 fails, it can be quickly disassembled and maintained.

[0050] It can be understood that the cylinder frame 52 corresponds to the heating zone separated by the mold cavity 32 and is used for the cooperation between each independent cylinder 53 and the heating module 61.

[0051] like Figure 5 and Figure 6 As shown, the mold cavity 32 is divided into several heating zones, and a single heating zone is preheated non-contactly by a heating element 62. The preheating interval is controlled by the telescopic adjustment of the piston rod 54. The preheating temperature is monitored by a temperature sensor 63. The temperature sensor 63 is also arranged in the inner cavity of the mold cavity 32 to correspond to each heating zone.

[0052] Among them, because the mold cavity 32 is made according to the workpiece to be die-cast, the heating requirements at different positions of the mold cavity 32 are different. An adjustable piston rod 54 is used to control the distance between the heating element 62 and the mold cavity 32 to control the heating temperature. The temperature sensor 63 is used to assist in monitoring the preheating temperature, which helps to ensure the temperature uniformity of the zoned heating and adapt to special-shaped mold cavities with different wall thicknesses, different depths, and different specifications.

[0053] It should be added that the heating element 62 of the heating module 61 uses an electromagnetic coil to perform non-contact heating, which does not damage the mold cavity 32.

[0054] In one embodiment, the constant temperature mechanism includes a constant temperature device 71 arranged on one side of the mold table 31. A circulation pipe 72 is installed on the constant temperature device 71 and is inserted into the clamping gap between the mold table 31 and the mold cavity 32. The circulation pipe 72 is embedded in the interlayer between the mold table 31 and the mold cavity 32, and constant temperature medium oil or water can be passed into it to maintain the mold temperature stable during the die-casting process and compensate for heat loss.

[0055] The thermostat 71 moves synchronously with the mold platform 31 to avoid entanglement of the pipeline and ensure continuous temperature control. The thermostat 71 is connected to an external thermostat.

[0056] The present invention also provides a method for rapidly preheating and temperature homogenizing a die casting mold, comprising the following steps:

[0057] Step 1: Divide the mold cavity 32 on the fixed mold base 11 into heating zones, and match the distance adjustment mechanism and preheating mechanism to the corresponding zones;

[0058] Based on the distribution of mold thermal nodes, such as wall thickness mutation areas and deep cavities, independent temperature zones are divided. Infrared thermal imaging pre-scan is combined to determine the temperature difference compensation area. Each zone is equipped with an independent cylinder 53, heating module 61, and temperature sensor 63;

[0059] Step 2: Perform the operation of step 1 on the mold cavity 32 on the movable mold base 12;

[0060] Perform differentiated zone preheating arrangements on the two mold cavities 32;

[0061] Step 3: Before die-casting the workpiece, the die bases 31 of the fixed die base 11 and the movable die base 12 are moved to the outside by the displacement mechanism to expose the die cavity 32;

[0062] The position of the mold table 31 is automatically adjusted by the displacement mechanism, and the mold cavity 32 is exposed to the outside in a more sufficient preheating area;

[0063] Step 4: Adjust the piston rod 54 in the cylinder 53 of the distance adjustment mechanism to match the spacing of the heating intervals of the mold cavity 32, and the heating element 62 of each heating module penetrates into the inner cavity of the mold cavity 32 to perform non-contact heating on the mold cavity 32;

[0064] Step 5: Monitor the temperature of the heating element 62 and the corresponding heating zone of the mold cavity 32 through the temperature sensor 63. After the preheating temperature of each heating zone reaches the preset value, the mold cavity 32 is reset to the fixed mold base 11 and the movable mold base 12 to complete the preheating before die casting.

[0065] It is necessary to add that:

[0066] Step 6: Constant temperature control during the die casting process. After the mold is closed, the constant temperature device 71 is started, and the heat transfer oil flows through the circulation pipe 72 in the interlayer of the mold table 31 to prevent the mold cavity from losing temperature and causing temperature fluctuations during the die casting process.

[0067] Step 7: Rapid cooling after production, switch the constant temperature device to cooling mode, introduce low-temperature medium, and accelerate the cooling and forming of the workpiece.

[0068] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A device for rapidly preheating and temperature homogenizing a die casting mold, characterized in that: It comprises a fixed mold base (11) and a movable mold base (12), wherein the corners of the fixed mold base (11) and the movable mold base (12) are penetrated by a traction column (13), and the distance between the two is controlled by a hydraulic device (14); The displacement mechanism comprises a rod frame (21) symmetrically arranged on the fixed die seat (11), a screw rod (22) passing through the middle of the rod frame (21), guide rods (23) arranged on both sides of the screw rod (22), a screw slide (25) capable of laterally displacement arranged on the screw rod (22) and the guide rod (23), and a suspension plate (26) penetrating a slot of the fixed die seat (11) connected to the screw slide (25); The mold mechanism comprises a mold table (31) mounted on the hanging plate (26), a mold cavity (32) is provided in the middle of the mold table (31), and a sealing plate (33) is installed in the clamping groove of the mold table (31) and the mold cavity (32); The distance adjustment mechanism includes a preheating platform (51) arranged outside the fixed die base (11), a plurality of cylinders (53) are installed on one end of the preheating platform (51) facing the die cavity (32), and a movable piston rod (54) is installed at the output end of the cylinder (53); The preheating mechanism comprises a heating module (61) mounted on the piston rod (54), one end of the heating module (61) protruding into the inner cavity of the mold cavity (32) is formed with a heating element (62) for preheating, and a temperature sensor (63) for measuring temperature is mounted on one side of the heating element (62).

2. A die-casting mold rapid preheating and temperature uniformity control device according to claim 1, characterized in that: The screw rod (22) is controlled to rotate by the driving of the servo motor (24), and the outer wall is provided with a screw slide (25) that slides along the guide rod (23). The combined structure of the screw slide (25) and the suspension plate (26) performs linear displacement synchronously.

3. The die-casting mold rapid preheating and temperature uniformity control device according to claim 1, characterized in that: The fixed mold base (11) and the movable mold base (12) have the same structure and are provided with the same mold mechanism inside. The mold cavities (32) of the two are sealed when closed.

4. The die-casting mold rapid preheating and temperature uniformity control device according to claim 1, characterized in that: At least one gate is provided at relative positions on the fixed mold base (11) and the mold platform (31), and the gate penetrates one end of the mold platform (31) and extends into the inner cavity of the mold cavity (32).

5. The device for rapid preheating and temperature homogenization of a die casting mold according to claim 1, characterized in that: A track (4) installed in the inner cavity of the fixed die base (11) is provided below the die table (31), and a guide slide supporting the die table (31) is installed in the slot of the track (4).

6. The die-casting mold rapid preheating and temperature uniformity control device according to claim 1, characterized in that: The cylinder (53) is mounted on the preheating table (51) via a cylinder frame (52) with a mounting hole, and one cylinder (53) is adapted to fit one heating module (61).

7. The die-casting mold rapid preheating and temperature uniformity control device according to claim 1, characterized in that: The mold cavity (32) is divided into several heating zones, and a single heating zone is preheated in a non-contact manner by the heating element (62). The preheating interval is controlled by the telescopic adjustment of the piston rod (54). The preheating temperature is monitored by the temperature sensor (63). The temperature sensor (63) is also arranged in the inner cavity of the mold cavity (32) to correspond to each heating zone.

8. The die-casting mold rapid preheating and temperature uniformity control device according to claim 1, characterized in that: The constant temperature mechanism comprises a constant temperature device (71) arranged on one side of the mold platform (31), and a circulation pipe (72) is installed on the constant temperature device (71) and is inserted into the clamping gap between the mold platform (31) and the mold cavity (32).

9. The device for rapid preheating and temperature homogenization control of a die casting mold according to claim 1, characterized in that: The constant temperature device (71) moves synchronously with the mold platform (31), and the constant temperature device (71) is connected to an external constant temperature device.

10. A method for rapid preheating and temperature homogenization control of a die casting mold according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: dividing the mold cavity (32) on the fixed mold base (11) into heating zones, and matching the distance adjustment mechanism and preheating mechanism corresponding to the divided zones; Step 2: Perform the operation of step 1 on the mold cavity (32) on the movable mold base (12); Step 3: Before die-casting the workpiece, the die platforms (31) of the fixed die base (11) and the movable die base (12) are respectively moved to the outside by a displacement mechanism to expose the die cavity (32) to the outside; Step 4: Adjust the piston rod (54) in the cylinder (53) of the distance adjustment mechanism to a distance suitable for each heating interval of the mold cavity (32), and the heating element (62) of each heating module is inserted into the inner cavity of the mold cavity (32) to perform non-contact heating on the mold cavity (32); Step 5: Monitor the temperature of the heating element (62) and the corresponding heating zone of the mold cavity (32) through the temperature sensor (63). After the preheating temperature of each heating zone reaches a preset value, the mold cavity (32) is reset into the fixed mold base (11) and the movable mold base (12), completing the preheating before die casting.

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