Black POM Cover Plate Parts Processing-Case Study

Product name: Cover plate

Accuracy grade: IT10

Materials: Black POM

Materials Specification: Plate 104mm*62mm*10mm

Product usage: Connected with the universal module at the core of optical equipment

Black POM/Polyformaldehyde

The scientific name for polyformaldehyde is also known as POM or special steel. Polymerized with formaldehyde as a raw material. POM-H (Polyformaldehyde homopolymer) and PM-CC (polyformaldehyde copolymer) are thermoplastic engineering plastics with high density and high crystallinity.

 Black POM Advantages

1. Good physics, mechanical and chemical performance, especially will excellent wear resistance.

2. Polyformaldehyde is a high-density crystalline polymer without a side chain and has excellent comprehensive properties.

3. Polyformaldehyde is a kind of hard and density material, with a smooth surface, shiny, light yellow or white, and can be used at -40-100°C for a long time.

4. Its wear resistance and lubrication are superior to most engineering plastics, and it has good oil resistance and peroxide resistance.

Black POM Physical Property

Polyformaldehyde tensile strength is 70MPa,  low water absorption, and the size is stable and gloss. Its properties are better than nylon. Polyformaldehyde is a highly crystalline resin and is the strongest of thermoplastic resins. It possesses high heat resistance, high bending strength, high fatigue resistance, and excellent wear resistance and electrical property.

Black POM Plasticity Feature

1. POM has a low friction coefficient and good geometric stability, especially suitable for bearing and gear manufacture.

2. POM is also used for pipe equipment (pipe valve, pump shell), lawn devices, etc., because of its high-temperature resistance.

3. POM is a kind of strong and elastic material, even at low temperature, it still has good crystallization index resistance, great stability, and impact resistance.

4. The high crystallinity of POM leads to a high shrinkage rate which up to 2%一3.5%.  And different reinforcement materials have different shrinkage rates.

5. POM is a crystalline plastic with a distinct melting point. Once the melting point is reached, the viscosity of the melt decreased rapidly. Decomposition occurs when the temperature exceeds a certain limit or when the melt is heated for too long. POM has a good comprehensive performance. It is the hardest thermoplastic. It is one of the plastic materials with the closest mechanical properties to metal. It has excellent

Black POM Chemical Property

According to the different molecular chain structures, poly (formaldehyde) qi Run plastic can be divided into homogeneous poly (formaldehyde) and copolymer poly (formaldehyde). The former has higher density, crystallinity, and melting point, but poor thermal stability, narrow processing temperature (10 degrees), slightly lower stability to an acid; The latter has a lower density, crystallinity, and melting point, but has good thermal stability, is not easy to decompose, and has a higher processing temperature (50 degrees).

Disadvantages: Strong acid corrosion, poor weather resistance, poor adhesion, close thermal decomposition and softening temperatures, and low oxygen limit index. Very limited resistance to acid, strong alkali, and ultraviolet radiation. (Adding uv agents can greatly improve its uv resistance). They are widely used in the automobile industry, electric equipment, mechanical device, etc. It can also be used as a faucet, frame window, and sink.

Black POM Machining Process

Machining device: CNC milling machine

Tool application amount: 10

Tool’s type: Φ20 vertical milling cutter, Φ8 vertical milling cutter, Φ6vertical milling cutter, Φ5vertical milling cutter, Φ7 drill, Φ3 drill, Φ3.2drill, Φ2.5 drill, M3 tap, R1 sphere mill

①Roughing and finishing process outer contour with Φ8 vertical milling cutter.

②Roughing and finishing the groove of work parts with Φ8、Φ6 vertical milling cutter; Roughing and finishing the slope with Φ5 vertical milling cutter and R1 sphere mill; Roughing and finishing Φ3 and Φ7 through-hole with Φ7 drill.

③Turning process, roughing and finishing the thick residual bur with Φ20 vertical milling cutter, and control the total height within 10mm; Roughing and finishing countersunk surface with Φ5 vertical milling cutter.

④Roughing and finishing the blind hole with Φ2.5 drill; Roughing and finishing the deep hole with Φ3.2 drill; Roughing and finishing M3 thread with Φ2.5 drill and M3 tap.

The finished product of black POM cover plate parts is as follows:

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