Hydraulic spotting mould clamping type liquid forging squeeze casting machine

Abstract

The invention discloses a hydraulic spotting mould clamping type liquid forging squeeze casting machine. According to the hydraulic spotting mould clamping type liquid forging squeeze casting machine, a front seat, a movable template and a rear seat are installed on a machine frame in sequence in the horizontal direction, a fixed mould is installed on the front seat, a movable mould is installed on the movable template, a spotting stand column plug oil cylinder is installed on the rear seat, a spotting stand column plug is directly or indirectly connected with the movable template and then pushes the movable mould and the fixed mould to be spotting pressed, a vacuum system capable of vacuumizing a forging cavity body is installed on the upper end face of the movable mould or on the upper end face of the fixed mould, a feeding system is installed beside the machine frame, liquid metal can be injected into the forging cavity body through the injection end of the feeding system, and the working states of the spotting stand column plug oil cylinder, the vacuum system and the feeding system are all controlled by a control panel beside the machine frame automatically. According to the hydraulic spotting mould clamping type liquid forging squeeze casting machine, hydraulic mould clamping is achieved by means of the spotting stand column plug oil cylinder, and mould clamping force is constant and can be compensated and increased instantly by the spotting stand column plug oil cylinder during the freezing period; air in the forging cavity body is pumped out through the vacuum system, and therefore air entrapment of a workpiece in a mold filling process is reduced, and product quality and the rate of finished products are improved.

Description

technical field [0001] The invention relates to a squeeze casting machine, in particular to a liquid die forging squeeze casting machine for hydraulic clamping and clamping. Background technique [0002] Liquid die forging refers to injecting qualified molten metal directly into a high-strength pressure chamber or cavity, and then continuously applying mechanical static pressure to make the molten metal undergo rheological filling, crystallization and rheology under the action of pressure. Feeding is a material forming method that finally obtains parts with a dense interior, a smooth appearance, and precise dimensions. Liquid die forging is mainly used in the production of automotive metal parts or large aluminum alloy parts. It is generally realized on a squeeze casting machine. According to the direction of the casting, there are vertical squeeze casting machines and horizontal squeeze casting machines. [0003] The early squeeze casting machine equipment mostly used fric...

AI Technical Summary

Problems solved by technology

In China, most of the extrusion casting in my country adopts the method of ordinary hydraulic press, which is labor-intensive and inefficient.

There is also an ordinary hydraulic press on the market that uses the toggle mechanism to mechanically lock the mold. During the die-casting process, the process parameters cannot be controlled in a real-time closed-loop; the toggle mechanism is used to mechanically lock the mold, the clamping force is unstable, and there is no automatic compensation for the clamping force. Function, casting process parameters vary greatly, mechanical wear and process conditions affect the stability and reliability of the clamping force; it is easy to entrain air during filling, causing internal tissue defects of the workpiece, and most of the equipment is 350KN, 550KN, mostly for the production of small and medium-sized aluminum Alloy structural parts (0.6~5kg / piece)

For the squeeze casting machine with large tonnage (1000KN and above), there are technical problems in key parts that need to be solved, such as the hydraulic system design is not perfect, the secondary injection speed is limited, and the instantaneous pressure increase cannot be met (die casting Theoretical 0.1 second inflection point), real-time process parameters are difficult to control, so the product quality is unstable, the molding rate is not ideal, and the production capacity effect is not good

The above reasons all lead to the difficulty of exerting the advantages of squeeze casting, making it difficult to popularize squeeze casting technology

Moreover, the extrusion casting machine equipment that adopts the toggle mechanism to mechanically close the mold also has the following disadvantages: 1) The stroke of the toggle mechanism needs to be adjusted for molds of different thicknesses, which is difficult and time-consuming; Among them, due to the influence of thermal expansion, the prestress of the mold clamping frame is changed, which is easy to cause the overload of the tie rod; 3) The precision of the toggle rod is high, and there will be high surface pressure in the hinge during use, sometimes due to oil film damage. Strong friction, easy to wear and difficult to maintain

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