The refrigeration system is a very important part of the high and low temperature test chamber. If the refrigerant leaks in the equipment, the high and low temperature test machine will not be able to cool down or the temperature is normal. How to deal with the refrigerant leakage in the high and low temperature test chamber? The following Shanghai Bao test will give you an analysis:

The refrigeration principle of the high and low temperature test chamber: the refrigeration compressor sucks the refrigerant vapor from the snorkel into the ultra-low temperature bottom pressure, and after the piston rod is pushed down according to the operation of the motor, the ultra-high pressure refrigerant vapor is discharged to the exhaust pipe for cooling. The circulatory system provides a driving force to achieve a refrigeration cycle in which refrigeration evaporates. If the refrigerant leaks, the refrigeration compressor will not be able to perform normal operation, which will affect the refrigeration function of the high and low temperature test box manufacturers.

1. Check the low pressure gauge of the refrigeration system. Below 0 bar, it is determined that there is refrigerant leakage in the refrigeration system of the high and low temperature test chamber;

2. Shut down, turn off the high and low temperature test chamber power supply, and let off the refrigerant of the refrigeration system. Then use a leak detector and a sponge to apply soapy water to the copper fittings, solenoid valves, oil, filters, nanos, etc., to check for bubbles, and to find the leak.

3. Check the leak point and mark it with a marker. The refrigeration system is filled with a small amount of nitrogen (open other valves to ensure that the system has no high pressure) to weld the leak point. If the component leaks, it should be replaced as much as possible;

4. After welding the leak point, pass 19 bar of nitrogen to the system. After 30 minutes, record the pressure values ​​of the two pressure gauges, keep pressure for 12 hours, no change in pressure (or little change), and let off the nitrogen in the system;

5. The system is vacuumed, and the refrigerant is added to the system. After the power is turned on for 20~30 minutes, the high and low temperature test chambers are turned on and off;

Vertical Machining Center

A 3-Axis CNC Machining Center/Mill is used for creating various industrial parts. This is achieved by using a wide-range of tooling and cutters depending on the type of material being cut and the end product being manufactured.
A 3-axis CNC Mill works on three separate axes:
X-Axis: Moving longitudinally or [left-to-right"
Y-Axis: Moving laterally or [front-to-back"
Z-Axis: Moving Vertically or [up-and-down"
CNC Vertical Machining Centers can include an additional axis to do specific cutting applications.
Rotary Tables are common as a 4th Axis on mills. They can vary in size and weight capacities and can have a horizontal or vertical configuration. They are generally an add-on to a standard 3-axis mill. The mill will have to have a proper 4th axis interface (generally a 4th axis card, drive and CNC Control) to accept a 4th axis rotary table.
Trunnion Tables can also be an add-on to a vertical CNC Mill. A Trunnion table adds a 4th and 5th axis to a standard mill by incorporating an A-Axis (which rotates around the X-Axis) as well as a C-Axis (which rotates around the Z Axis).
A true 5-axis machine can allow for continuous 5-axis machining simultaneously. This increases both speed and accuracy when machining the part.
CNC Vertical Mills generally have a single spindle, automatic tool changer, work table and CNC Control.
The spindle on a CNC Machining Center can have a wide range of speeds depending on what material is being cut and the depth of cut that is required. Typical spindle speed ranges from 0 to 10,000 RPM. Higher speeds are used for lighter materials including graphite and aluminum among others. Higher speeds can reach 12,000 RPM up to 50,000 RPM and higher.
The Spindle is loaded with tool holders and cutters to achieve the proper material removal. There are many different styles of tool holders including BT and CAT – which have a conical shape as well as HSK, which uses flanges instead of a taper to lock the holder in place. BT and CAT Holders can come in various sizes including 30, 40 and 50 taper depending on the size of tool the cutter requires. HSK (Hollow taper ShanK) comes in a variety of types – A through F – and sizes from HSK-32 up to HSK-160. HSK is considered a better tool holder for high speed machining as there is more surface contact between the spindle and the holder, reducing vibration and keeping the tool from pulling back into the receiver when cutting at high speeds.
A CNC Vertical Machining Center offers different styles of automatic tool changers as well. The most common style is the umbrella-style. This is where the tool holders are loaded into the carousel vertically. The other style is a drum or side-mount style. The tools are loaded in horizontally in this type. This allows for greater part height in the work area and can help accommodate a rotary table, fixture or any additional work holding devices mounted to the table.

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Jiangsu Hoston Machine Tools Co., Ltd. , https://www.hostoncncs.com