There are some different casting methods for the influence of different models and properties of skf bearings. Among them, lost foam casting is a common casting method, but compared with ordinary sand casting, some technologies are immature and white defects are easy to occur. 1. Cause: During the pouring process, the EPC is flushed into the cavity by the fast flowing molten iron, which is mixed with the molten iron, causing the casting to be sanded. After machining, the castings were found to have sand on the processing surface, which was scattered or densely distributed like snowflakes. It is customarily called "white defects". This defect will cause the casting to be scrapped, which is very harmful in actual production. Therefore, it should be strictly avoided in production. 2, white defects often produce position 3, the solution The crutch is a good helper for the elderly to travel, which can help the elderly to maintain their body balance, support part of their weight and reduce the burden on their legs.
TRUTECH CO., LTD. is an enterprise specializing in the research, development, production and sales of professional OTC products.The main products include shower chairs, armrests, toilet racks and toilet armrests, bedside armrests, elderly chairs and sofas, crutches and walking aids, knee pads, waist supports and other equipment.
Cane,Elegant Walking Cane,Walking Cane Umbrella,Walking Canes Underarm TRUTECH CO., LTD. , https://www.wxgrabbar.com
1) Gate cup - The gate cup is made of quartz sand with water glass as a binder to blow CO2. If the CO2 is not properly controlled, the strength of the gate cup is not good. When pouring, the sand in the cup easily falls into the cavity.
2) The connection between the gate cup and the sprue is mainly due to the direct flushing of the gate by the molten metal, which destroys the coating and causes the sand to collapse.
3) The lower part of the joint between the sprue and the sprue - due to the high sprue height, the metal liquid drop is large when pouring, and the coating of the runner is destroyed, causing the sand to break into the cavity.
1) Prevention of coating damage - Due to the high degree of vacuum here, the permeability of the coating at this location cannot be considered, and the thickness and strength of the coating are increased to enhance the flow of the barrier sand.
2) Combination principle outside the box - the model and the gating system are combined before packing
3) Principle of paint drying - It is necessary to connect the casting system when packing. The contact should be closed with paint, but the paint must be blown dry to prevent the wet paint from falling off.
4) Pouring - avoiding the molten iron facing the sprue during pouring, the molten iron should flow through the pouring cup and then flow into the sprue.
Walking stick is the most commonly used walking aid for the elderly, including single-legged walking stick, three-legged walking stick, four-legged walking stick, three-legged walking stick with seat, etc
The surface of the handle should have anti-skid design to prevent it from slipping easily from the hand when subjected to external force. The size of the handle should be such that the thumb and forefinger can overlap to form a closed ring when holding.
The bottom end shall be equipped with a foot pad made of rubber sleeve or other anti-skid materials, which is moderately soft and hard. Generally, the rubber head with moderate hardness is more anti-skid than the hard plastic head.
Only by using crutches with proper length can you feel relaxed, comfortable and safer when walking.
The cause and solution of "white defect" on skf bearing surface