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Aluminum alloy pattern ring low-pressure cast outer mold structure and low-pressure casting method

A low-pressure casting and pattern ring technology, which is applied in the field of aluminum alloy pattern ring low-pressure casting outer mold structure, can solve the problems of long cooling time, shrinkage porosity, large heat capacity, etc., and achieve the effects of ensuring dimensional accuracy, improving work efficiency, and saving electricity

Active Publication Date: 2012-07-04
合肥大道模具有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the outer mold and runner with the same parameters are poured into castings with a wall thickness of more than 80mm, due to the heavy weight of molten aluminum, relatively large heat capacity, and too long cooling time, the condensation sequence of the casting will change, and point F of the runner will first Cooling at the E point of the casting cuts off the feeding channel, resulting in insufficient feeding at the E point of the casting, resulting in porosity and shrinkage defects, and in severe cases, it will be scrapped

Method used

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  • Aluminum alloy pattern ring low-pressure cast outer mold structure and low-pressure casting method
  • Aluminum alloy pattern ring low-pressure cast outer mold structure and low-pressure casting method
  • Aluminum alloy pattern ring low-pressure cast outer mold structure and low-pressure casting method

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Embodiment 1

[0037] Embodiment 1: refer to Figure 3-5 , the outer mold 6 of the present invention is low-pressure casting of aluminum alloy pattern rings, and a cooling liquid flow channel 7 that surrounds the outer mold body in a circumferential direction is arranged in its body, and the distance between its center and the bottom surface of the outer mold is 1 / 4 of the height of the outer mold , and a partition plate 8 is arranged in the cooling liquid flow channel, and a water inlet nozzle 9 and a water outlet nozzle 10 of the cooling liquid flow channel are respectively arranged on both sides of the partition plate.

[0038] A sealing plate 11 is provided on the outside of the cooling liquid channel 7 to seal the cooling liquid channel, and the outer wall of the sealing plate 11 is on the same plane as the outer wall of the outer mold body. In the specific setting, the cross-sectional area of ​​the coolant channel 7 is 15cm 2 , the wall thickness of the outer mold body on its inner si...

Embodiment 2

[0039] Example 2: In this example, the casting process parameters are set according to the following conditions: the outer mold is preheated at 350°C, the plaster core is preheated at 110°C, the runner is preheated at 400°C, and the pouring temperature is 700°C. Filling process according to figure 1 The pressure curve shown is carried out, the filling pressure is 0.3bar, the filling speed is 0.007bar / s, the holding pressure is 1.0bar, and the time is 2000s. During this process, 50-60s after the aluminum liquid is full, start to fill the outer mold with cooling water, and control the flow rate to 150-200cm 3 / min lasts for 500-600s and then stops. After the pressure holding time reaches 2000s, when the temperature of the casting drops to 350°C, the pressure is released, the mold is demoulded, and the cooling is continued at room temperature. The control of the flow rate is based on the size of the casting wall thickness 80-100mm, at 150-200cm 3Choose within the range of / s....

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Abstract

The invention discloses an aluminum alloy pattern ring low-pressure cast outer mold structure which comprises an outer mold body which is in a conical shape overall and is provided with a cavity inside; a position in the outer mold body, which is close to the bottom, is provided with a cooling liquid runner; the cooling liquid runner circumferentially goes around the outer mold body for a round, and a partition board is arranged in the cooling liquid runner; and both sides of the partition board are respectively provided with a water inlet nozzle and a water outlet nozzle of the cooling liquid runner. The invention solves the defects of shrinkage, porosity and the like which occur below a casting; and because the clotting time of the lower part of the casting is shortened, the shrinkage rates of the calibers at the upper and the lower parts are nearly the same, thereby facilitating the accurate setting of casting process parameters, and improving the dimensional precision of the casting.

Description

Technical field: [0001] The invention relates to an outer mold structure for low-pressure casting of an aluminum alloy pattern ring and a forced cooling method for low-pressure casting using the mold. Background technique: [0002] The aluminum alloy tread ring is an important part of the tire mold for vulcanization forming tire tread. The processing methods of this part are generally used at home and abroad. There are mainly the following three types: [0003] 1. Carving process: suitable for truck tire moulds; [0004] 2. Electrocorrosion process: suitable for truck tire and passenger tire molds; [0005] 3. Aluminum alloy casting process: suitable for passenger tire molds. [0006] Due to the requirements of safety, comfort and aesthetics, the pattern design of passenger tires is more complicated than that of truck tires, and the shape accuracy and dimensional accuracy of the pattern are required to be high. Therefore, the pattern ring processing of the mold mainly ado...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/04B22D21/04B22D27/04
Inventor 蒋国华金兆铮王金洋许方
Owner 合肥大道模具有限责任公司