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FAQ for CNC after Metal Injection Molding Process

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2018-09-19 09:39:00
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In addition to metal injection molding technology, CNC engraving is good at small tool finishing, milling, grinding, drilling and high-speed tapping. It is similar like metal injection molding also widely used in 3C industry, mold industry, medical industry and other fields.

 

1. What are the main differences between CNC carving and CNC milling?

 

CNC engraving and CNC milling both adopt milling principle. The main difference is the diameter of tool used, common tool diameter range of CNC milling is 6-40 mm, and that of CNC engraving is 0.2-3 mm.

 

2.  Is CNC milling only capable of rough machining and CNC engraving only capable of finishing?

 

The processing quantity of rough machining process is large and the processing quantity of finishing process is small, so some people habitually regard rough machining as "heavy cutting" and finishing as "light cutting". In fact, rough machining, semi-finishing, finishing is the concept of process, it represents different stages of processing. .Therefore, the accurate answer to this question is that CNC milling can do heavy cutting or light cutting, while CNC engraving can only do light cutting. For example, we often make blank parts by metal injection molding or die casting firstly, after that then to do CNC engraving or CNC milling to reduce process cost at most.

 

3. Can CNC carving do rough processing of steel materials?

 

To determine whether CNC engraving can process a certain material, mainly depends on how big a tool can be used. The cutting tool used in CNC engraving determines its maximum cutting ability. If the mold shape allows the use of a tool with a diameter of more than 6mm, it is strongly recommended that the tool be machined by CNC milling or metal injection molding first and then by engraving the remaining material.

 

4. Can add a growth head in the center spindle to finish engraving?

 

It can't. The main reason is the design of CNC center considers its own range of cutting tools, its overall structure is not suitable for carving. Main reason for this misconception is that they take the high-speed electric spindle as the only feature of engraving machine.

 

 

5. CNC engraving can use small diameter cutting tools, can it replace EDM?

 

The answer is No. Although engraving reduces the diameter of milling tools, small molds used to be made by EDM can be made by carving now, the length / diameter ratio of engraving tool is generally around 5:1. When using a small diameter cutter, so it can make very shallow cavity, while the EDM process has almost no cutting force, so long as the electrode can be made, the cavity can be machined.

 

 

6.     What are the main factors affecting carving process?

 

Machining is a complicated process, and there are many factors affecting it, mainly including machine characteristics, cutter, control system, material characteristics, processing technology, auxiliary fixtures and peripheral environment.

 

7. What do CNC engraving requests for its control system?

 

The first process for CNC engraving is milling, so its control system must have milling processing control. For small cutting tools, feedback function must be provided at same time, as well as low ahead the path to reduce the breaking frequency of small cutting tools. Meanwhile, it is necessary to increase the cutting speed in relatively smooth path segment, so as to improve the efficiency of carving.

 

8. What do the material’s properties affect processing?

 

The main factors affecting material engraving performance are material type, hardness and toughness. Material categories include metallic and non-metallic materials. In general, the greater hardness, the worse processability, the greater viscosity and the worse processability.; The more impurity, the worse processability, the greater hardness of particles inside, the worse processability. A general standard is: the higher carbon content, the worse processability, the higher alloy content, the worse machinability, the higher content of nonmetallic elements and the better processability (but the nonmetallic content in general materials is strictly controlled).

 

9. What materials are suitable for carving?

 

Non-metallic materials suitable for carving include organic glass, resin, wood, etc. Non-metallic materials not suitable for carving include natural marble, glass and so on. Suitable for engraving metal materials including copper, aluminum, hardness less than HRC40 soft steel, not suitable for engraving metal materials, such as quenched steel.

 

Keywords in the article: Metal Injection Molding/CNC
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