High-temperature charging barrel of die-casting die

Abstract

The utility model provides a high-temperature charging barrel of a die-casting die, which comprises a charging barrel and a plurality of cooling water channels, the cooling water channels are arranged along the axial direction of the charging barrel, the cooling water channels are arranged in the lower half side wall of the charging barrel, a plurality of heating rods are arranged in the upper half side wall of the charging barrel, and the heating rods are distributed in the circumferential direction; the heating rod is arranged along the axial direction of the charging barrel; each heating rod is connected with a cable; and a thermocouple is arranged on the outer side wall of the charging barrel. The utility model ensures that the charging barrel pressure chamber is uniformly heated, so that axial cracks at the bottom of the pressure chamber sprue, interference between the charging barrel pressure chamber and the punch are reduced, strain of the pressure chamber is reduced, the service lives of the pressure chamber and the punch are prolonged, the production cost is saved, the flowability and feeding capacity of molten metal in the cavity are improved, and the mechanical property fluctuation of a casting is reduced; and low material temperature can be used for filling, and the risk of insufficient molten metal casting due to cold shut is reduced.

Description

Technical Field

[0001] The utility model relates to the field of casting, in particular to a high-temperature barrel of a die-casting mold. Background Art

[0002] The die casting mold generally includes a fixed mold fixed on the fixed mold mounting plate of the die casting machine and a movable mold fixed on the movable mold mounting plate of the die casting machine. The movable mold moves relative to the movable mold mounting plate to complete the mold closing and mold opening. When the mold is closed, a cavity is formed between the fixed mold and the movable mold, and liquid metal enters through the barrel under high pressure and fills the entire cavity.

[0003] In the prior art, a cooling water channel is provided inside the lower half side wall of the barrel of a conventional die-casting mold. Water or oil is usually used in the cooling water channel to control the barrel temperature. The temperature is usually between 100°C and 300°C, resulting in a relatively low temperature. The bottom of the barrel's pressure chamber contacts the molten metal for a long time, while the top of the pressure chamber does not contact or contacts the molten metal less, which can easily cause uneven heating of the pressure chamber. Affected by the thermal expansion of the material, the pressure chamber is easily deformed and cracked. Among them, radial deformation causes the matching clearance between the barrel pressure chamber and the punch to change, resulting in interference and tearing the pressure chamber. In addition, the bottom of the pressure chamber of the barrel of a conventional die-casting mold contacts the molten metal for a long time. When the molten metal in the contact area with the pressure chamber enters the liquid-solid and solid-liquid two-phase regions, a large amount of pre-crystallized tissue is easily generated, which reduces the mechanical properties of the product. Among them, the molten metal containing the solid phase has a large flow resistance, and the friction between the molten metal and the pressure chamber is large, which greatly reduces the dynamic injection force of the punch, thereby reducing the product quality.

[0004] Therefore, there is an urgent need to provide a high-temperature barrel of a die-casting mold to avoid strain in the barrel pressure chamber, while improving the fluidity of the molten metal, thereby improving product quality. Utility Model Content

[0005] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the utility model is to provide a high-temperature barrel of a die-casting mold. The utility model proposes a high-temperature barrel of a die-casting mold, comprising a barrel and a plurality of cooling water channels, wherein the cooling water channels are arranged along the axial direction of the barrel, the cooling water channels are arranged inside the lower half side wall of the barrel, a plurality of heating rods are arranged inside the upper half side wall of the barrel, and each of the heating rods is distributed circumferentially; the heating rods are arranged along the axial direction of the barrel; each of the heating rods is connected to a cable; and a thermocouple is arranged on the outer side wall of the barrel.

[0006] Preferably, a plurality of mounting holes are opened inside the upper half side wall of the barrel, and the mounting holes extend from one end of the barrel to a position close to the other end of the barrel, and the mounting holes are evenly distributed circumferentially, and the mounting holes are adapted to the heating rod.

[0007] Preferably, at least two mounting grooves are provided on the outer side wall of each mounting hole, the mounting grooves are distributed axially along the mounting hole, and the mounting grooves are communicated with the mounting hole.

[0008] Preferably, a detachable fixing portion is provided in the mounting groove for fixing the heating rod; a groove is provided at the bottom of the fixing portion, and the groove is adapted to the shape of the heating rod.

[0009] As described above, the high-temperature barrel of a die-casting mold involved in the utility model has the following beneficial effects:

[0010] 1) The utility model arranges a plurality of heating rods inside the upper half side wall of the barrel. The heating rods cooperate with the cooling water channel to make the barrel temperature reach a higher temperature and ensure that the barrel pressure chamber is heated evenly, thereby reducing the axial cracks at the bottom of the pressure chamber gate, reducing the interference between the barrel pressure chamber and the punch, and reducing the pressure chamber strain.

[0011] 2) The utility model stabilizes the temperature of the barrel pressure chamber through heating rods and cooling water channels, which can ensure the stability of the pressure chamber size, improve the sealing of the pressure chamber, increase the life of the pressure chamber and the punch, and save production costs. At the same time, by increasing the stable pressure chamber temperature, the temperature of the molten metal in the contact area with the pressure chamber can be significantly increased, effectively reducing the size and number of pre-crystallized crystal nuclei, thereby improving the fluidity and shrinkage compensation capacity of the molten metal in the cavity and reducing the fluctuation of the mechanical properties of the casting.

[0012] 3) The barrel of the utility model can be filled at a lower material temperature, thereby reducing the risk of cold shut and insufficient metal casting. At the same time, for shell and cylinder products, the generation of shrinkage and shrinkage cavities can be reduced through low-temperature casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A front view of a high-temperature barrel of a die-casting mold is provided for an embodiment of the utility model.

[0014] Figure 2 A left view of a high-temperature barrel of a die-casting mold is provided for an embodiment of the utility model.

[0015] Figure 3 An AA cross-sectional view of a high-temperature barrel of a die-casting mold is provided for an embodiment of the utility model.

[0016] Figure 4 A top view of a high-temperature barrel of a die-casting mold is provided for an embodiment of the utility model.

[0017] Figure 5 A BB cross-sectional view of a high-temperature barrel of a die-casting mold is provided for an embodiment of the utility model.

[0018] Figure 6The present invention provides a front view of a heating rod and a cooling water channel of a high-temperature barrel of a die-casting mold.

[0019] Figure 7 The present invention provides a left view of a heating rod and a cooling water channel of a high-temperature barrel of a die-casting mold in an embodiment of the present invention.

[0020] Figure 8 The present invention provides a top view of a heating rod and a cooling water channel of a high-temperature barrel of a die-casting mold.

[0021] Description of reference numerals:

[0022] 100, barrel; 110, mounting hole; 111, mounting groove; 200, cooling water channel; 300, heating rod; 400, cable; 500, thermocouple; 600, fixing part; 610, groove. DETAILED DESCRIPTION

[0023] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of the relative relationship, without substantial change of the technical content, should also be regarded as the scope of the implementation of the utility model.

[0025] like Figure 1-8As shown, the utility model provides an embodiment of a high-temperature barrel of a die-casting mold, including a barrel 100 and a plurality of cooling water channels 200, the cooling water channels 200 are arranged along the axial direction of the barrel 100, the cooling water channels 200 are arranged inside the lower half side wall of the barrel 100, and a plurality of heating rods 300 are arranged inside the upper half side wall of the barrel 100, and each heating rod 300 is distributed circumferentially and can be flexibly arranged according to the set temperature. The heating rods 300 are arranged along the axial direction of the barrel 100, and each heating rod 300 is connected to a cable 400 to heat the top of the barrel, and the barrel pressure chamber can be heated to 300°C to 600°C as needed. Two thermocouples 500 are arranged on the outer wall of the barrel 100, and the thermocouples 500 are placed about 5mm away from the inner wall of the barrel pressure chamber cavity. The thermocouple 500 is arranged in the upper half of the barrel 100, and is used to detect and control the heating rod 300 to heat the upper half of the barrel 100 so that its temperature reaches the preset temperature. The thermocouple 500 is disposed at the lower part of the barrel 100 and is used to detect and control the flow of the cooling water channel 200 so that the temperature of the lower part of the barrel reaches a preset temperature.

[0026] When in use, for example, the temperature of the barrel 100 is preset to 500°C, and the die-casting mold is not opened in the cold mold state. At this stage, the barrel is heated by the heating rod 300 and the molten metal. When the thermocouple 500 detects that the temperature of the barrel reaches the preset value of 500°C, the cooling water is turned on to cool down the lower half of the barrel 100 through which the molten metal flows, so that the temperature of the lower half of the barrel 100 is maintained at the preset value of 500°C, wherein the flow rate of the cooling water can be adjusted according to the temperature fluctuation amplitude detected by the thermocouple. In the cold mold state of the die-casting mold, the heating rod 300 is turned on to make its temperature reach the preset value of 500°C, and the constant temperature of the barrel 100 is maintained through the thermocouple 500 and the control program. Through the combined action of the heating rod 300 and the cooling water channel 200, the overall temperature of the barrel 100 is maintained at a preset value of 500°C, so that the overall temperature of the barrel 100 is evenly heated, thereby reducing the axial cracks at the bottom of the gate of the barrel 100 pressure chamber, reducing the interference between the barrel 100 pressure chamber and the punch, reducing the pressure chamber strain, increasing the life of the pressure chamber and the punch, and saving production costs. It should be noted that heating the barrel 100 by the heating rod 300 can effectively increase the temperature of the molten metal in the contact area with the barrel 100 pressure chamber, significantly reduce the size and number of pre-crystallized crystal nuclei, and improve the fluidity and shrinkage compensation capacity of the molten metal in the die casting mold cavity, thereby improving the uniformity of the metallographic structure of the casting and reducing defects such as looseness, reducing the fluctuation of the mechanical properties of the casting, especially reducing the fluctuation of the elongation. In addition, the periodic temperature difference in the area where the bottom of the barrel 100 contacts the molten metal can be reduced to 15°C, and the temperature of the molten metal in the barrel 100 at 500°C is reduced to less than 10°C, while the temperature of the molten metal in a traditional low-temperature barrel is around 40°C. Therefore, the barrel 100 can be filled with a lower material temperature. For shell and cylinder products, this application can use low-temperature casting to prevent shrinkage cavities and shrinkage.

[0027] like Figure 4-5 As shown, a plurality of mounting holes 110 are opened inside the upper half side wall of the barrel 100, and the specific number of the mounting holes 110 can be determined according to actual needs. The mounting holes 110 extend from one end of the barrel 100 to the other end near the barrel 100, and the mounting holes 110 are evenly distributed circumferentially. The mounting holes 110 are adapted to the heating rod 300, and can fully increase the temperature of the barrel 100.

[0028] When in use, the heating rod 300 is inserted into the mounting hole 110 and fixed so that the heating rod 300 is close to the barrel wall, and then the cable 400 is connected to each heating rod 300, so that the barrel can be heated by the heating rod 300.

[0029] like Figure 3 , Figure 5 and Figure 8 As shown, at least two mounting grooves 111 are provided on the outer wall of each mounting hole 110, and the mounting grooves 111 are distributed along the axial direction of the mounting hole 110, and the mounting grooves 111 are connected to the mounting hole 110. A detachable fixing portion 600 is provided in the mounting groove 111 to fix the heating rod 300; a groove 610 is provided at the bottom of the fixing portion 600, and the groove 610 is adapted to the shape of the heating rod 300.

[0030] When in use, after the heating rod 300 is inserted into the mounting hole 110, the fixing part 600 is placed in the mounting groove 111 so that the groove 610 abuts against the side wall of the heating rod 300, and the fixing part 600 is locked in the mounting groove 111 by screws to prevent the heating rod 300 from moving during the operation of the barrel 100.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A high-temperature barrel of a die-casting mold, comprising a barrel (100) and a plurality of cooling water channels (200), wherein the cooling water channels (200) are arranged along the axial direction of the barrel (100), and the cooling water channels (200) are arranged inside the lower half side wall of the barrel (100), characterized in that: A plurality of heating rods (300) are arranged inside the upper side wall of the barrel (100), and the heating rods (300) are evenly distributed in the circumferential direction; the heating rods (300) are arranged along the axial direction of the barrel (100); each heating rod (300) is connected to a cable (400); and a thermocouple (500) is arranged on the outer side wall of the barrel (100).

2. The high temperature barrel of the die casting mold according to claim 1, characterized in that: A plurality of mounting holes (110) are provided inside the upper side wall of the barrel (100), and the mounting holes (110) extend from one end of the barrel (100) to the other end close to the barrel (100), and the mounting holes (110) are distributed circumferentially, and the mounting holes (110) are adapted to the heating rod (300).

3. The high temperature barrel of the die casting mold according to claim 2, characterized in that: At least two mounting grooves (111) are provided on the outer side wall of each mounting hole (110); the mounting grooves (111) are distributed axially along the mounting hole (110); and the mounting grooves (111) are communicated with the mounting hole (110).

4. The high temperature barrel of the die casting mold according to claim 3, characterized in that: A detachable fixing portion (600) is provided in the installation groove (111) for fixing the heating rod (300); a groove (610) is provided at the bottom of the fixing portion (600), and the groove (610) is adapted to the shape of the heating rod (300).

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