saw cutting
Glass fiber reinforcement
thermoset
basal body
Laminated board
, adopt
handsaw
or
circular saw
Stop. Using thermoplastic composite materials
band saw
And common tools such as circular saws.
refrigerant
graphite
The/epoxy composite material is preferably made of epoxy resin impregnated with epoxy resin.
Hard metal
Cut with a knife. Control in sawing process
see
Strength is very important to ensure the quality of sawing surface. Although sawing temperature is also a factor to be controlled, it generally has little influence, because the highest temperature encountered during sawing generally does not exceed epoxy resin.
softening temperature
( 182℃)。
Metal matrix composites
It goes well with diamonds.
Jigsaw
Sawing, but its cutting speed is slow and it can only be sawed in a straight line. adopt
diamond grinding wheel
correct
Ceramic matrix composites
Conventional sawing has two speeds: one is 250 rpm and the other is 4000 rpm. This kind of saw will make
cut surface
It has considerable damage to ceramic matrix composites. However, at higher sawing speed, the damage is greater, but the section is relatively uniform.
(2)
Drilling and copying milling When drilling or copying milling on composite materials, dry method is generally adopted. Most thermosetting composites
Laminated plate
Shrinkage will occur after drilling and copying milling, so a certain allowance should be considered when finishing, that is, the size of the drill bit or copying milling cutter should be slightly larger than the aperture size, and
tungsten carbide
or
Diamond bit
Or a copying milling cutter. It is best used when drilling holes.
Typesetting adjustment
Pad to avoid edge delamination and outer layer tearing. In addition, the drill bit must be kept sharp, and the process of quickly removing drill cuttings and minimizing the temperature rise of the workpiece must be adopted. When drilling with thermoplastic composite materials, it is more important to avoid overheating and the accumulation of cuttings, so the drill bit should be single-minded.
angle of helix
There is a wide and smooth chip removal groove, and the cone tip of the drill bit should be made of special material. Generally, the helix angle of a bit after grinding is about 10- 15.
Back view angle
9-20
cone angle
60- 120. The drilling speed used is not only related to the material to be drilled, but also related to the size and depth of the hole. ordinary
Portable electric drill
When the speed is 900r/min, the effect is the best, and when the speed is fixed, the effect is the best.
air drill
When the speed is 2 100 rpm.
amount of feed
The best effect is1.3mm/s/s.
(3)
Milling, cutting, turning and grinding
Polymer matrix composites
Usage convention
plain lathe
Or can be conveniently turned by a bench lathe,
Boring
And cutting. At present, machining tools are commonly used.
high-speed steel
Tungsten carbide and
Diamond bit
. High-precision polymer-based composite parts can be processed by sand grinding or grinding. The most commonly used particle size is 30-240.
sandcloth
Or drum type
grinder
. Most commercially available abrasives are acceptable, but they are best used.
synthetic resin
Guaranteed
carborundum
Abrasiveness. When thermoplastic polymer-based composites are polished by conventional machinery, coolant should be added to prevent abrasive blockage. There are two kinds of grinders, one is wet grinding.
abrasive belt grinding machine
The other is dry method or wet method.
abrasive disk
. When grinding with silicon carbide or alumina grinding wheel, do not use flowing coolant to prevent the workpiece from softening. Composite laminates can be milled on standard machine tools by general technology. Brass milling cutter,
High speed steel milling cutter
Tungsten carbide milling cutter and
Diamond milling cutter
Can be used. The back angle of the milling cutter must be ground to 7- 12, and the grinding edge should be sharp. The suggested milling speed of high-speed steel milling cutter is 180-300.
Meter/minute,
Progress in tools
The dosage is 0.05-0. 13.
Mm/r, using air cooling. Thermoplastic composites can be used.
metal processing
Lathe and milling machine processing. High-speed steel tools can be used effectively as long as they remain sharp. Of course, tungsten carbide or diamond tools are better. Metal matrix composites can be processed by cutting, turning, milling and grinding. For most metal matrix composites, the premise of obtaining excellent processed products is that the tool should be sharp, the cutting speed should be appropriate, enough coolant or lubricant should be supplied, and the feed speed should be fast.