Precoated sand core secondary shooting process of casting runner machinery

Abstract

The invention relates to a precoated sand core secondary shooting process of a casting runner machinery, which comprises the steps of: firstly, dismantling a casting runner sand core into a main core and an auxiliary core, wherein the main core and the auxiliary core can be used for carrying out smooth drawing according to respective core-separating surfaces under the condition that a die insert is not used; and secondly, manufacturing a main core box and an auxiliary core box, manufacturing the auxiliary core through once sand shooting of the auxiliary core box, placing the manufactured auxiliary core in a cavity in the main core box at a position of the auxiliary core, carrying out secondary sand shooting, filling moulding sand in a cavity of the main core box at a position of the main core, manufacturing an integral complete runner sand core formed by connecting the main core and the auxiliary core, and extracting the integral complete runner sand core from the core-separating surface of the main core. The main core and the auxiliary core are manufactured into the integral sand core by adopting the secondary sand shooting process, the problem that sand core quality influenced by adopting the die insert or a core-assembling method is avoided, the main core and the auxiliary core of the sand core are well jointed without seams, burrs and flashing are avoided being formed in a casting runner, and casting quality is ensured. According to the invention, working hours during core manufacturing and core assembling are reduced, core manufacturing core is reduced, and labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to a core-making process of mechanically coated sand in a casting flow channel, in particular to a secondary sand-shooting process for mechanically coated sand core making which is suitable for the core of the casting flow channel and cannot use a split core surface. Background technique [0002] The flow channel structure of castings is complex, and the surface finish of the flow channel is high. Therefore, the mechanical coated sand core making process is often used to form the casting flow channel. This process uses a separate core surface of the metal mold. The metal mold must be heated to 180-280 degrees Celsius, use compressed air to fill the sand, and use the ejector pin to eject the mud core. [0003] The core-making process of mechanical coated sand determines that the mud core can only use one core surface, supplemented by loose blocks or core-making technology. If the process of supplemented by loose blocks is used, the...

AI Technical Summary

Problems solved by technology

[0003] The core-making process of mechanical coated sand determines that the mud core can only use one core surface, supplemented by loose blocks or core-making technology. If the process of supplemented by loose blocks is used, the mold of this process must be heated to 180-280 It is easy to burn hands when taking loose blocks after demoulding, it is very inconvenient for workers to operate, and it is easy to damage the integrity of the surface of the mud core, and the mold cost will also increase due to the use of loose blocks; if the core is separated and the core is used In this way, although the core making process is simplified, there are obvious seams at the joint of the mud core. If the repair is not in place, it is easy to cause flashes and burrs in the casting flow channel. The flashes and burrs that cannot be cleaned may cause the casting to be scrapped and cannot be found in time. Flashes and burrs that are difficult to clean can cause castings to be scrapped in batches after finishing, causing great economic and social losses; at the same time, the cores are also easily damaged during core assembly and cause losses. The assembly of the cores also increases labor costs and increases The difficulty of quality management

Images