Milled cooling channel

In milled cooling channels deflection aids (plugs on flow plates) are used to make sure that the fluid has intensive contact with the channel walls to ensure optimal cooling. 

Preferably, aluminum castings are used with drilled or milled cooling channels. Care must be taken to clear the flash area to ensure that the fixture can close properly. The cavity dimensions must have reduced shrink allowances that is, the cavity of the fixture must be smaller than the blow cavity. 

The surface trough was made of Lucite, 45 X 15 X 1.5 cm. and was divided into two compartments of equal size by a septum of Lucite, 1.5 cm. high. Cooling channels for temperature control were milled into the bottom of the trough. The monolayer was spread inside a paraffined mica frame which floated on the water and was firmly positioned by external mounts. The surface tension was measured with a double-hook torsion balance and a sand-blasted platinum Wilhemy plate. A Beckman model G pH meter with standard glass and KC1 electrodes was used to measure pH. 

The milling cutter for HPC of Ti alloys is equipped with cooling channels through the body and the inserts to enable coolant flow at pressures of p = 20-70 bar very close to the cutting edge. The internal coolant supply during the milling process improved heat transportation and chip flow from the process zone and doubled the tool life. 

Rubbers are also being extruded, in a not essentially different way from plastics. Cooling of the extrusion cylinder is necessary to prevent premature vulcanisation as a result of the heat developed by internal friction. The extruder is fed by ribbons, obtained from milled sheets. End products are hoses, profiles, and cable mantles. On-line vulcanisation can be achieved by passing the extrudate through a steam channel, while the rate of extrusion is adjusted to the rate of curing. For this purpose high-rate vulcanisation recipes have been developed. Steam temperatures of about 200 °C are being applied (15 bars pressure). Treads for motorcar tyres are also extruded they are wrapped round the pre-formed carcass and then formed and vulcanised in a press. 

In new laboratory planetary mills, the jars rotate due to frictional clutch with the cylindrical housing of the mill. A scheme and the design of the apparatus are shown in Fig. 4.1 [5]. The apparatus consists of the housing 1, carrier 2, jars 3, guiding rim 4, sheave 5, channels in the center and at the periphery of the carrier for cooling water. The diameter of the jars is 70 mm, the working volume is 150 cm, ball mass is 200 g, the mass of the substance under treatment is 10 g. 

Milling is used when intensive cooling by drilling channels is not achievable, for example, in the shoulder portion of blown bottles, recessed bottom parts, neck rings, and in preform molds for stretch blow molding. 

---