Casting method and mould for car air conditioning compressor slanting plate

Abstract

The invention provides a method for casting a swashplate of an automobile air-conditioning compressor and a mould thereof. The method comprises the steps: squeezing press is exerted to melt inside a feed room so as to cause the melt to flow into a die cavity stably from the side surface through a pouring channel; when the die cavity is filled with the melt, pressure-keeping press is exerted to the melt from one end vertical to the die cavity, feeding pressure is exerted to the center of the melt from the other end vertical to the die cavity before the melt is completely solidified and the pressure is canceled after maintained for 4-10s; the squeezing press is canceled after the melt at the connection part of a pouring channel and the die cavity is solidified; the pressure-keeping press is canceled after the melt is completely solidified; then a cast is fetched out by opening the die. The mould provided by the invention essentially comprises the sequentially communicated feed room, pouring channel and die cavity; the top and the bottom of the die cavity are respectively provided with a channel inside which a punch used for providing pressure to the top and the bottom of the die cavity is arranged. The aluminum alloy swashplate cast by the invention is compact and has small content of inner impurities, good shaped appearance, fine structure and no bubble in thermal treatment.

Description

Technical field [0001] The present invention relates to the field of casting technology, in particular to a method for casting and forming an automobile air-conditioning compressor swash plate. technical background [0002] Modern cars are all equipped with car air conditioners. "Compact structure, light weight, high efficiency, low power consumption, good reliability, and good cooling effect" has always been the goal of the development of car air conditioners. Air-conditioning compressors play a very important role in the performance of air-conditioning. At present, swash plate air-conditioning compressors are widely used in automobile air-conditioning. Due to the high speed of the air conditioner compressor in use (4000~5000rpm under normal conditions, up to 7000rpm), there are higher requirements for the swash plate, the key component of the swash plate air conditioner compressor. The swash plate with superior performance is not only light in weight, but also has high strength...

AI Technical Summary

Problems solved by technology

The production of the swash plate by hot die forging mainly has the following disadvantages: 1) It needs to use customized A390 continuous casting billet and cut it quantitatively to ensure that the weight and size of each forged swash plate cannot exceed the tolerance

2) The blank must be heated to 350-500°C before forming, which consumes a lot of energy and increases the cost

3) The plastic deformation of high-silicon aluminum alloy is small, and the forgings are prone to crack defects during hot die forging, resulting in a decrease in yield

4) The forging force required for hot forging is large, the investment in required equipment is high, and the die life is short

The manufacturing method of the aluminum alloy swash plate described in this patent application document mainly has the following problems: 1) When squeeze casting or liquid die forging the swash plate, the aluminum alloy material in the barrel, including the hard shell formed by the solidification of the barrel wall, and the paint , oxide skin, etc. all enter the casting cavity, and inclusion defects are easily formed inside the casting after forming, and the yield of parts after machining is low

2) The filling flow is not smooth, and cold shuts are easy to form, and the bottom of the casting is prone to foaming after heat treatment, resulting in a high rejection rate

If it is necessary to eliminate heat treatment foaming, the method of vacuuming must be adopted, which increases the operation process, and the overall quality of the casting fluctuates greatly and is unstable

3) During extrusion production, only one mold can be achieved, and the production efficiency is low

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