The titration stand to install the instrument packing list has a cross. The titration stand first opens the back cover, removes one of the nuts on the titration stand, and then fixes it in the middle mounting hole and fastens the nut.
The 25ml burette is installed from top to bottom on the cross, the lower end is connected to the upper end of the sulfur absorption cup and the glass bead is placed on the latex tube, and the other end is connected to the long glass tube on the plastic reagent bottle stopper by the ¢6×9 latex tube. Top. (The connection method of carbon buret and sulfur burette is the same)
Gas pipeline connection Take two equal lengths of white pipe (about 10cm) respectively and connect the two ends of the glass tee (1) on the two solenoid valves at the rear of the titration stand. The glass tee (1) is at the other end. Connect one end of the other glass tee (2) with a white pipe and the third end of the air inlet connection glass tees (2) of the ND-1 type arc burner to the oxygen pressure reducing valve. The ND-1 type arc Combustion furnace outlet connected to the left sulfur cup inlet port.
The connection method of the three pipes on the upper end of the titration stand: the short glass tube on the left of the sulfur plastic reagent bottle stopper, the lower glass bottle in the middle, the liquid nozzle, and the short glass tube on the right of the carbon plastic reagent bottle stopper.
Note: Each instrument kit kit contains 2 watertight clips for the latex tube and 2 glass tee clips. The glass tee (1) indicates one of the glass tee (2) indicates the other. Clamped on the two pipes of solenoid valve inlet to control the filling rate
"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."
Gravity Die Casting
Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.
The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.
GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.
There are three key stages in the process.
- The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
- Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
- Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
- Good dimensional accuracy
- Smoother cast surface finish than sand casting
- Improved mechanical properties compared to sand casting
- Thinner walls can be cast compared to sand casting
- Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
- Steel pins and inserts can be cast in to the part
- Faster production times compared to other processes.
- Once the tolling is proven, the product quality is very repeatable.
- Outsourced Tooling setup costs can be lower than sand casting.
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