CN-122007375-A - Die casting die for automobile engine connecting rod

Abstract

The application discloses a die casting die for an automobile engine connecting rod. Comprises a first die, a second die, a molding cavity and a temperature control component. Firstly, through the cooperation of the installation position of the temperature control component and the inner wall structure of the second accommodating cavity, the working stability of the semiconductor refrigerating and heating sheet in a high-temperature environment can be improved, so that preconditions are provided for the temperature control of the semiconductor refrigerating and heating sheet, and secondly, through the rapid response characteristic of the temperature control of the semiconductor refrigerating and heating sheet, the temperature of an insert region arranged in a molding die cavity can be consistent with the temperature of other regions in the molding die cavity in a single compression casting period, and the probability of quality defects of the molding of the connecting rod is reduced.

Inventors

• ZOU WEI
• WU HONG

Assignees

• 成都卫达机械制造有限公司

Dates

Publication Date

20260512

Application Date

20260407

Claims (10)

1. 1. A die casting die for an automotive engine connecting rod, comprising: a first mold, in which a first mold core is provided; the second die is arranged on the first die, and a second die core is arranged in the second die; The molding die cavity is arranged between the first die core and the second die core, the molding die cavity comprises a first cavity arranged on the first die core and a second cavity arranged on the second die core, the first cavity comprises a first cavity, two ends of the first cavity are respectively provided with a second cavity and a third cavity, inserts are respectively arranged in the second cavity and the third cavity, a first accommodating cavity is arranged in the inserts, and a second accommodating cavity is arranged in the first accommodating cavity; The temperature control assembly is arranged in the second accommodating cavity and comprises a semiconductor refrigerating and heating sheet, a plurality of heat conducting columns and a heat insulating layer, wherein the heat conducting columns are arranged around the periphery of the semiconductor refrigerating and heating sheet, one end of each heat conducting column is fixedly connected with the inner wall of the first accommodating cavity, the other end of each heat conducting column is fixedly connected with the semiconductor refrigerating and heating sheet, and the heat insulating layer is arranged on the inner wall of the second accommodating cavity.
2. 2. The die casting die for connecting rods of automobile engines according to claim 1, further comprising an air cooling assembly, wherein the air cooling assembly comprises a fan, a heat radiating member and an air flow channel, one end of the air flow channel is communicated with the semiconductor refrigerating and heating plate, the other end of the air flow channel is communicated with the outside of the first die, the fan and the heat radiating member are arranged in the air flow channel, one side of the heat radiating member is connected with the semiconductor refrigerating and heating plate, and the other side of the heat radiating member is connected with the fan.
3. 3. The die casting mold for an automotive engine connecting rod of claim 1, further comprising a casting assembly, wherein the casting assembly comprises a casting cavity and a casting runner, the casting cavity is arranged on the first mold, a feed inlet of the casting runner is communicated with the casting cavity, and a discharge outlet of the casting runner is communicated with the first cavity.
4. 4. A die casting die for connecting rods of automobile engines as defined in claim 3, wherein a discharge port of said pouring runner is communicated with a middle portion of said second cavity.
5. 5. The die casting die for connecting rods of automobile engines according to claim 1, wherein a thimble base plate moving in the thickness direction of the first die is further arranged on one side of the first die, which is away from the second die, a thimble is arranged on the thimble base plate, one end of the thimble is fixedly connected with the thimble base plate, and the other end of the thimble is inserted into the bottom wall of the first cavity.
6. 6. The die casting mold for connecting rods of automobile engines according to claim 5, wherein the ejector pin comprises a first ejector pin, a second ejector pin and a third ejector pin, one end of the first ejector pin is located at a bottom wall edge of the first cavity, one end of the second ejector pin is located at a middle portion of a bottom wall of the second cavity, and one end of the third ejector pin is located at a bottom wall edge of the third cavity.
7. 7. The die casting mold for an automotive engine connecting rod of claim 5, further comprising a first guide assembly comprising a first guide sleeve disposed on the ejector pin base plate and a first guide post disposed on the first mold, the first guide sleeve and the first guide post being in guiding engagement.
8. 8. The die casting mold for an automotive engine connecting rod of claim 1, further comprising a second guide assembly including a second guide post disposed on the first mold and a second guide sleeve disposed on the second mold, the second guide sleeve and the second guide post being in guiding engagement.
9. 9. The die casting die for an automobile engine connecting rod according to claim 8, wherein an end of the second guide bush remote from the first die is provided with an exhaust passage, one end of which communicates with an inside of the second guide bush, and the other end of which communicates with an outside of the second die.
10. 10. The die casting mold for connecting rods of automobile engines according to claim 1, further comprising a positioning assembly, wherein the positioning assembly comprises a first positioning column arranged on the first mold and a first positioning hole arranged on the first mold core, the first positioning column and the first positioning hole are in positioning fit, and/or the positioning assembly comprises a second positioning column arranged on the second mold and a second positioning hole arranged on the second mold core, and the second positioning column and the second positioning hole are in positioning fit.

Description

Die casting die for automobile engine connecting rod Technical Field The application relates to the technical field of dies, in particular to a die casting die for an automobile engine connecting rod. Background The die casting process is an advanced casting technology for quickly injecting molten metal into a precise die cavity by using high pressure and solidifying and forming under pressure, and is widely applied to the fields of automobiles, electronics, aerospace, consumer goods and the like. When designing automobile engine connecting rod die casting die, in order to be convenient for the die casting shaping of connecting rod big end and connecting rod little end at connecting rod both ends, generally set up the mold insert that is used for connecting rod big end and connecting rod little end shaping respectively at the both ends in die cavity of die casting die, simultaneously in order to control the cost of mould, usually adopt different materials to prepare mold insert and mould body, can lead to the temperature in the setting mold insert region in the shaping die cavity to be unanimous with the temperature in other regions in the shaping die cavity causes the fashioned quality problem of connecting rod like this, concretely, when the coefficient of heat conductivity of mold insert is greater than the coefficient of heat conductivity of mould body, heat flow density is directly proportional to the coefficient of heat conductivity of material, under the same temperature gradient, the speed that heat lost through the mold insert can be faster, thereby make the temperature in the shaping die cavity set up the region of mold insert reduce, like this in the molten metal filling stage, viscosity increases sharply when flowing through the mold insert region of low temperature, mobility decline. Thus leading to quality defects in the shaping of the connecting rod, for example, if the temperature is lower than the "liquidity critical temperature" of the alloy, the molten metal cannot perfectly replicate the sharp profile of the insert, or cannot be completely fused at the junction of two molten metals, and thus cold shut or insufficient pouring can occur around the mounting holes of the big and small ends of the connecting rod, when the coefficient of thermal conductivity of the insert is lower than that of the die body, according to the law of thermal conductivity, the heat flow density is proportional to that of the material, and under the same temperature gradient, the loss rate of heat through the insert is slower, which means that the heat is "blocked" in the insert and cannot be effectively dispersed, so that the temperature of the area in the shaping die cavity where the insert is arranged is increased. In this way, in the solidification stage of molten metal, quality defects such as that the big end and the small end of the connecting rod belong to thick and big hot joint areas, and rapid heat dissipation is required to promote sequential solidification from outside to inside. When the temperature of the area where the insert is arranged is increased, the solidification time of the area is greatly prolonged, the solidification speed is reduced, and because the surrounding area (the rod body) is possibly solidified, the insert area is still in a liquid state or a semi-solid state due to high temperature, and molten metal feeding is not obtained during solidification shrinkage, concentrated shrinkage holes or serious central shrinkage holes are easily formed at the root parts or the inside of mounting holes of the big end and the small end of the connecting rod. In order to solve the technical problem that the temperature of an insert region arranged in a molding die cavity is inconsistent with the temperature of other regions in the molding die cavity to influence the molding quality of a connecting rod, an external water-cooling or oil-heating system is generally adopted to control the temperature of the insert, but because the external water-cooling or oil-heating system indirectly exchanges heat with the insert through a channel, the heat transfer path is from water or heat conduction oil to a stainless steel tube or a copper tube to an insert matrix material, each transfer path can introduce thermal contact resistance, the thermal contact resistance of the temperature control system can be increased, the heat transfer efficiency is reduced, the response is delayed when the temperature of the external temperature control system is controlled, and the temperature of the insert region arranged in the molding die cavity and the other regions in the molding die cavity cannot be consistent in a single casting cycle (for example, 10-30 seconds), so that the defect of quality defect occurrence of the molding of the connecting rod is increased is overcome. Disclosure of Invention The embodiment of the application provides a die casting die for an automobile engine connecting rod, which can reduce the prob