(1) For precision water cooler for high -speed electric main shafts:

(1) Water temperature: The cooling water temperature of the main axis should be controlled at about 25 ° C;
(2) Water pressure: The water supply pressure required by the main axis cooling is about 0.2MPa;
(3) Calculation of the heat power of the main shaft: P heat = P motor · η p heat -the main shaft thermal kw P motor -the main axis driving motor power KW η — the spindle thermal loss efficiency efficiency For high -speed electricity spindles, it can be calculated based on heat loss η = 30%(general domestic electric spindle η = 30%, Taiwan's main shaft value η = 25%, Germany, Switzerland and Japan's main shafts η = 20%) Essence
Example: The power of the main axis motor of a machine tool is 11kW, the maximum speed 30000rpm,
Trial estimated thermal capacity of the main axis of machine tools: p heat = 11x30%= 3.3 kw
The cooling capacity of SCW-1.5C at a water temperature of 25 ° C and the ambient temperature of 30 ° C is 3.8kW, which is greater than the main axis of 3.3kW, which fully meets the requirements of the use; when the water supply pressure is 0.2MPa, the flow is 23L/min.

(2) Preckering water cooler for low -speed wire electric spark cutting machines:

(1) Calculate thermal power according to the power installation power: P heat = η · P installation of electricity
P heat -heat calories kw
P installation of electricity -installation power KW
效 -The efficiency of heat loss
For general low -speed wire electric spark cutting machines, 20%are taken.
(2) Calculate the heat power of the water temperature rising rate according to the water tank
P heat = cp · m · Δt /t
P heat — heating power KW
1 kw = 860 kcal /h
1 kcal /h = 1.16x10-3 kw
CP ——— The fixed pressure ratio KJ /KG · ℃
The fixed pressure ratio of water 4.18 kj /kg · ℃
m — The total water volume of the water tank kg
ΔT —— The temperature rising ° C of the unit time
T (t) -Time s
Example: The total water volume of the working liquid box of a low -speed wire electric spark cutting machine is 400kg, and the water temperature of 40 minutes at normal working rises from 25 ° C to 29 ° C.
The selection method of refrigeration machine is as follows: P heat = 4.18 × 400 × (29-25)/(40 × 60) = 2.79 kW precision water cooler's cooling capacity should be greater than 20%of the heat volume. You can choose MCW-35A or MCW- 35B of water cooler.


Note: 1. When the precision water cooler is connected to the equipment, it is recommended to install a filter in the waterway system. The installation location is shown in the figure above.
         2. The precision water cooling machine should be used in a good ventilation, no dust and corrosive gases, and there are no sundries around the equipment.