Zinc casting is a process that involves melting zinc alloy and pouring the molten metal into a mold to create detailed and precise parts and components. Zinc casting is a cost-effective and efficient method for producing high-quality parts.

What are the processes involved in honing machining

From the cutting process of honing machining, honing can be divided into three processes: constant pressure feed honing, constant maximum feed honing, and constant pressure quantitative composite feed honing.

(1) Constant pressure feed honing is divided into three stages: shedding cutting, crushing cutting, and clogging cutting.

1. Detachment cutting stage. At the beginning of this constant pressure honing, due to the roughness of the hole wall, the contact area between the oil stone and the hole wall is very small, the contact pressure is high, and the protruding part of the hole wall is quickly ground off. Due to the high contact pressure on the surface of the oilstone and the wear of the oilstone binder by the chips, the bonding strength between the abrasive particles and the binder decreases. Therefore, some abrasive particles fall off on their own under the action of cutting pressure, exposing new abrasive particles on the oilstone surface, which is known as oilstone self sharpening.

2. Crushing and cutting stage. As the honing work progresses, the surface of the hole becomes increasingly smooth, and the contact area with the oil stone also increases. The contact pressure per unit area decreases, and the cutting efficiency gradually decreases. The chips cut at the same time are small and fine. These chips also have minimal wear on the adhesive. Therefore, the oil stone abrasive particles rarely fall off, and at this time, grinding is not done by new abrasive particles, but by cutting at the tip of the abrasive particles. Therefore, the load on the tip of the abrasive grain is very high, and the abrasive grain is prone to breakage and fragmentation, forming new cutting edges.

3. Block the cutting stage. As the honing continues, the contact area between the oilstone and the hole surface increases, and extremely fine chips accumulate between the oilstone and the hole wall, making it difficult to remove, resulting in oilstone blockage and making it very smooth. Therefore, at this time, the oil stone cutting ability is extremely low, equivalent to polishing. If the honing continues and the oil stone becomes severely blocked, resulting in adhesive blockage, the oil stone will completely lose its cutting ability and generate severe heat, which will affect the accuracy and surface roughness of the hole. At this time, the honing work should be ended as soon as possible.

(2) Quantitative feed honing. During quantitative feed honing, the feed mechanism expands the feed at a constant speed, forcing the abrasive particles to forcefully cut into the workpiece. Therefore, the honing process only involves detachment cutting and crushing cutting, and it is impossible to produce cold blocking cutting phenomenon. Because when the oil stone blocks and the cutting force decreases, if the feed rate is greater than the actual grinding amount, the honing pressure increases, causing the abrasive particles to fall off and break, and the cutting effect is enhanced. When honing with this method, in order to improve the machining accuracy of the hole and reduce surface roughness, a non feed method can be used to improve the machining accuracy of the hole by honing for a certain period of time.

Zinc Casting