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Bratislavskaya Street, 109341 Moscow

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© LLC, TD Plastmass Group 2019

INN 7723909200

KPP 772301001

PRODUCTION OF PARTS

Manufacturing parts with polymers from individual drawings

Plastmass Group provides a full range of production services for the machining of plastics, both own production (ZEDEX, INKULEN PE) and raw materials (caprolon, polytetrafluoroethylene (teflon), polyacetal, etc.).We manufacture prototype lots and serial production of parts based on drawings or samples of customers. Processing is performed on modern lathes with CNC and machining centers of Holz Her with the length of the manufacturing field of 1.5 x 6.0 meters!

HOW WE CREATE UNIQUE PARTS

The use of automated machining centers ensures improved quality and precision machining parts, minimizing the spoilage. Thanks to modern machines the labour intensity and impact of human mistake factor reduce, saving time significantly for setup and changeovers of equipment.

Our specialists are able to produce parts on order made of polymeric materials for domestic and imported equipment:

  • Conveyor rollers

  • Bushings and plain bearings for any equipment

  • Sliding guides (for chains and belts)

  • Slide plates (track shoes, bearings, guides) for the shafts and sliding mechanisms

  • Sprocket wheels

  • Wheels, pulleys

  • Seals, gaskets, washers

  • Non-standard parts and fasteners

The cost of parts’ production is negotiable and depends on the material and quantity of the products. The term of manufacturing is from 1 to 20 days. The minimum quantity is not limited.

Watch the video on manufacturing of a finished part from a ZEDEX blank part.

TOLERANCES FOR MACHINED FINISHED PARTS

Plastics are subject to different physical laws respect the metals. Thermal expansion up to 10 times bigger, lower stiffness, moisture absorption, anisotropy, post- shrinkage and warping due to stress relaxation, lead to higher manufacturing tolerances. Generally, the IT-tolerance from 9 to 12 are used. The IT-tolerance ranges of 7 and 8 are available in special cases.

You find more information in our Plastmass Group catalog. Please contact us for access into our DATABASE.

MACHINING

Due to the high thermal expansion coefficients, it makes sense to control the dimensions only when the room temperature is reached. Tolerances for the dimensions of polymer parts are higher than for metal parts.

VOLTAGE RELEASE

It is recommended to heat some ZEDEX polymers before processing and process them in a preheated state. To exclude the formation of cracks, any mechanical treatment should be performed at temperatures not lower than + 18 ÷ 25 °C

MACHINES

For processing products from ZEDEX materials, machines with lower capacities are sufficient than for processing the same metal products.

Tools should be very sharp and smooth, with a large rake angle.

INSTRUMENTS

For small production, the use of tools from HSS is possible. To produce a large number of products, the use of HM tools is recommended. Serial production of parts with small tolerances requires the use of diamond coated tools.

LATHE TURNING

Lathe turning should be made with a large chip cross section removal and high feed rate speed. the cutting should be done in 1 operation.

COOLING

The best dissipation of heat is achieved over the chip. In addition a jet of compressed air, that also pulls the shavings away, can be used.

SAWING

The band saw cut speed should be between 8 – 25 m/s.

Applicable tool: metal blades or carbide tines. To obtain a better cut, it is recommended to use, a saw blade with a pitch from 4 to 6 mm.

MILLING

To dissipate the milling machining overheat, it is suggestible to choose the largest possible milling stressed cross section. This process is obtainable with a high feed rate, a large depth and a not to high cutting speed.

REAMING

Very tight bore tolerances are obtainable by reaming with a reamer according to DIN 206, DIN 212, DIN 219. A minimum machining allowance of 0.1 mm has to be planned, because of the plastic elastic behavior.

THREAD CUTTING

Tap drill holes for screw threads up to M8 and bigger than M10, should have respectively a diameter dimension ca. 0,1 mm and ca. 0,2 mm, bigger than the metal´s one.

FILING & RASPING

Filing with rough-hewn wood rasps is well-tried, but filing with a file blades represents an advantage.

GRINDING

Generally, the ZEDEX® high performance polymers can be grinded and polished.

To grind a workpiece can be used commercial abrasive belts and grinding discs, possible with a coarse grain size.