คำตอบที่ 14
ถ้าอยากรู้ มีให้อีก ไปเจอข้อมูลเก่า ใน HDD มีข้อมูลที่ supplier เคย มา present ให้ฟัง...... ที่ทำงานนำเข้าวัตถุดิบประเภทนี้มาใช้ผลิดชิพเป็นหลักอ่ะ พอจะมีข้อมูลนิดหน่อย....เค้าก็มีหลายๆๆอย่างผสมกัน มี fiber หรือ Filler ด้วยเป็นโครงสร้าง... นั่นคือเค้ายุ่ยๆๆ เมื่อเก่าแล้วเหมือนเรือไฟเบอร์ ประมาณนั้น............
the synthetic resin material used for each piston 16 is the glass-reinforced and filled phenolic thermosetting moulding composition supplied by Hooker Chemicals and Plastics Corporation of America as type Durez 29502,
this material obeying the requirements discussed above as necessary for use in a disc brake. Durez 29502 includes of the order 20% by weight of catalysed phenolic resin, compounded with 55% by weight of Woolastonite and 15% by weight of short glass fibres, with lesser amount of calcium carbonate, titanium dioxide, and charcoal together with a zinc strearate release agent.
Alternative materials for the piston 16 include the glass fibre and mineral filled phenolic moulding material supplied by Bakelite Xylonite Ltd., of England as type Xw71685; the glass-reinforced phenolics supplied by Fiberite Corp. of Winona, Minnesota, U.S.A., as tupe Fm4000 series; the glass reinforced and filled condensation products of phenol with aralkyl ethers as supplied by Moulding Powders Ltd., of Wigon, England as Xylok types SX649 and SX652;
glass-reinforced epoxy thermosetting compounds also sold by Fiberite; and the polyimides sold by Rhone-Poulence of France as Kinel.
While the above materials are intended for compression moulding, their compositions are capable of adjustment to allow them to be injection moulded.
To produce each piston 16, the Durez moulding composition in granular form is initially pre-plasticized in a heated extruder and is then compression moulded at 170° C.
After removal from compression moulding tools, the piston is post cured for 16 hours at 170° C and is then cooled and ground to remove the slight taper provided on the cylindrical surface of the body 21 to facilitate separation from the moulding tools.
In addition, the grinding operation is arranged to produce a surface finish of 16 microns over the exterior of the piston.
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