Cast templet

Abstract

The invention relates to a cast templet. The biggest section of a casting is horizontally divided into an upper templet and a lower templet, wherein the lower templet is provided with a groove that is sunken into in a joint face by 50mm; the upper templet is correspondingly provided with a lug boss that is 50mm higher than the joint face. The cast templet is designed into a convex-concave structure so as to ensure enough sand containing of the structure of the casting, reduce the use level of sand cores and improve the appearance and the quality of the casting. Flash, parting-line flash and burr are reduced obviously, and the working efficiency is increased by about 50%, the labor intensity of workers is greatly reduced, and the environmental pollution is effectively controlled owing to the decrease of core making and grinding amount, thus an obvious social effect is obtained, and the invention is especially suitable for mass production of moulding lines.

Description

technical field [0001] The invention relates to a casting tool, in particular to a casting pattern plate. Background technique [0002] All foundries at home and abroad are producing some castings with irregular shapes and many sand cores, which are prone to casting defects and bring troubles to the processing of castings. The parting method of the casting model is very critical to the demoulding operation and the number of sand cores. The traditional model classification method is along the center line, adopts plane classification, and splits as a whole. Generally, the parting (model) surface is selected at the largest cross-section of the casting. Some castings are higher than the height of the upper mold (or lower mold) than the height of the sand box, which will not be able to be produced; only the position of the parting (model) surface can be adjusted to make the model Both the upper mold and the lower mold can be placed in the sand box. In this way, the design worke...

AI Technical Summary

Problems solved by technology

Generally, the parting (model) surface is selected at the largest cross-section of the casting. Some castings are higher than the height of the upper mold (or lower mold) than the height of the sand box, which will not be able to be produced; only the position of the parting (model) surface can be adjusted to make the model Both the upper mold and the lower mold can be placed in the sand box. In this way, the design workers usually design the core seat at the place where the mold cannot be removed, and design the core box accordingly and make the core. After molding, the core is placed in the cavity , so that it forms a complete structure; on the high-efficiency automatic molding line, due to the fast production pace, multiple sand cores need to be placed, which affects production efficiency on the one hand, and on the other hand, the labor intensity of workers is greater; the number of sand cores used increases , it is necessary to increase core-making equipment or manual core-making, increase investment and increase production costs. Due to the large amount of gas generated by sand cores, especially resin sand cores, it is easy to cause casting waste such as pores. For large-scale and automated production, production preparation It takes a long time, and the sand core is prone to moisture and damage from time to time during transportation and turnover

[0003] Take the 97 large bracket as an example: (1) The structure of the 97 large bracket is complex. If the parting (type) surface is selected at the largest cross-section of the casting, the height of the mold will be higher than the height of the sand box, and production will not be possible; only the parting can be adjusted. The position of the mold (type) surface enables the upper and lower models of the model to be placed in the sand box. In this way, 8 sand cores need to be placed in the production of this casting, resulting in more sand cores; (2) In the high-efficiency automatic molding On-line, the production rhythm is fast, and the placement of multiple cores not only results in high labor intensity for workers, but also affects the production rhythm, and the economic benefit is low; (3) using more cores requires a large cost in core-making equipment and labor. The production cost of castings increases significantly; (4) more cores are used, castings are prone to defects such as seams, flashes, burrs, etc., the appearance quality of castings is poor, and the cost of grinding is significantly increased. In addition, the labor intensity of grinding workers is high and the working environment is harsh , the rate of casting rejects increased significantly

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