With the development of science and technology, machining technology is no longer limited to turning, milling, grinding and drilling, and more processing technologies have emerged, which meet the functions of product production and manufacturing and make up for the shortcomings of traditional processing; Now let’s learn about these new machining processes!
1、 Metal injection molding (MIM)
1. Introduction: metal injection molding (MIM) is a near net shape forming process suitable for producing small, three-dimensional complex shapes and products with special performance requirements. This technology is a new near net shape forming technology of powder metallurgy, which introduces modern plastic injection molding technology into the field of powder metallurgy.
Machining only turn milling, planing, grinding and drilling? OUT！ Let’s learn about the new machining process. 2. Process flow: all kinds of fine metal powders (generally less than 20) μ m) According to a certain proportion and preset binder, the feed with rheological characteristics is made, and the part blank is formed by injecting into the mold cavity through the injection machine. After removing the binder and high-temperature sintering, various metal parts can be obtained.
MIM process combines the flexibility of injection molding design and the high strength and integrity of precision metal to achieve low-cost solutions for extremely complex geometric components.
The flow chart is as follows:
MIM process flow diagram
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3. Applicable materials and typical binders
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Table 1: MIM applicable materials
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Table 2: MIM typical binders (* PE: polyethylene, PP: polypropylene, PA: polyaldehyde resin, PS: polystyrene
PEG: polyethylene glycol, PMMA: polymethylmethacrylate, pea: polyvinylamine, PEVA: polyethylene vinyl acetate copolymer)
4. Application scope of metal injection molding (MIM)
MIM has incomparable advantages over conventional powder metallurgy, machining and precision casting methods. The most prominent advantages are:
It is suitable for the forming of various powder materials, and the products are widely used;
With high utilization rate of raw materials and high degree of production automation, it is suitable for continuous mass production.
It can directly form small parts with complex geometry (0.03g ~ 200g);
High dimensional accuracy (± 0.1% ～ ± 0.5%) and good surface finish (roughness 1 ~ 5 μ m）；
The product is relatively uniform (95 ~ 100%) and has excellent performance;
Therefore, it has been widely used in light weapons, watches, electronic instruments, orthodontic brackets, automobile engine parts, electronic seals, cutting tools and sports equipment.
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Milling machine? OUT！ Come and learn about the new machining technology
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2、 Nano injection molding technology (NMT)
1. Introduction: the process of combining metal and plastic with nanotechnology is called nano injection molding technology (NMT). Firstly, the metal surface is nano treated, and then the plastic is injected on the metal surface. Magnesium, stainless steel, titanium and other metals can be combined with hard resin to realize integrated molding.
2. Process flow:
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NMT process flow diagram
3. Applicable materials
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Combination of aluminum and aluminum
Metal substrate:
Aluminum and its alloys: 1000-7000 series (5052, 6061, 6063, 7072, 7075)
Copper and its alloys: cac16, C110, C5191, c1020, kfc5, klf194
Magnesium and its alloys: az-31b, az-91d
Titanium and its alloys: ksti, ks40
Stainless steel: SUS-304, sus-316, 316L and other iron series alloys (mim304l)
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Combined sample form
Plastic substrate:
PPS: Baoli pps5120 (white) / PPS 1135 (black) / PPS f458a (black)
Dongcao bgx120 (black) / bgx140 (black) / bgx545 (black)
PBT
PA (nylon nylon): Black (including PA6 and PA66)
PPA: multiple colors
4. Scope of application
NMT products can be expanded to a wide range of fields, including all kinds of 3C electronic product shells and auto parts.
NMT technology shines brightly in fields with high requirements for thin wall, such as mobile phone shell design and manufacturing. It can form complex resin bosses on the metal shell only through metal insert molding, and there is no need to punch holes on the metal shell. In addition, it can also help reduce the machining process of metal frame and reduce the cost.
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HTC battery cover, picture source: Changying precision
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NMT forming process of on-board computer control box, picture source: Alix alexrims
3、LDS
1. Introduction to LDS: LDS is a technology that uses numerical control laser to directly print circuit patterns on the surface of plastic parts. The processing time is short, the precision is high, and the circuit pattern is not limited by the geometry of the physical device
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The rear cover design of Nubian Z5 adopts LDS technology
2. Process flow: as shown in the figure below
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LDS process
3. Advantages of LDS Technology: compared with traditional processing technology, LDS technology has the following advantages. Because of this, it is now widely used in many fields:
Flexible design and space saving: three-dimensional circuit carrier increases the available space; Smaller and lighter devices; With more functions and greater design freedom, it is possible to realize innovative functions.
Flexible manufacturing: the printed circuit (PCB) process needs to modify the film to modify the pattern, and the mold to modify the shape. As long as the LDS process modifies the CAD data, it has obvious advantages.
Environment friendly: no pollution, high voltage, waste water, strong current and noise in the manufacturing process
High technical efficiency: short production cycle, durable laser system, less maintenance, suitable for 7×24 uninterrupted production, and low failure rate
4. Application field
RF and communication industry: mobile phone antenna, notebook antenna, etc;
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Automobile and transportation equipment manufacturing industry, which is reflected in reducing weight and providing durability;
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Medical equipment field
Integrated small pitch for high density medical devices
There are also precision instruments & Measurement and military / aviation industry.
There are also precision instruments & Measurement and military / aviation industry.
Process comparison
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4、 Hawker energy technology
1. Introduction: hawker energy is an innovative energy processing technology that uses the combined energy of activation energy and impact energy to process metal parts. One processing can make the surface of parts reach the mirror surface and realize modification
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2. Haoke energy technology process
Turning / milling / grinding / polishing / carburizing – Haoke energy;
In other words, it is OK to ensure the machining accuracy of the workpiece before using Haoke energy. Haoke can reduce the roughness value by 2-3 levels based on the previous machining process, and improve the hardness and wear resistance at the same time! Improve micro cracks caused by machining, eliminate machining stress, and predict compressive stress.
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3. Processing advantage
One time clamping without turnover and re alignment, which improves the processing efficiency;
The surface roughness is greatly improved, which can achieve a good surface state;
At the same time, it can resist fatigue manufacturing, improve micro crack defects and delay the initiation of fatigue cracks;
Improve hardness and wear resistance;
4. Application field
Various general machinery manufacturing industries such as military industry, aerospace, shipbuilding, reducer, water pump and valve are widely used
5. CNC machine tools – CNC
1. Introduction: CNC is commonly known as “CNC machine tool”, that is, an automatic machine tool controlled by program. The control system can logically process the program with control code or other symbolic instructions, make the machine tool perform the specified action through computer decoding, and finally make an original metal plate into the desired shape through long-time precision machining.
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2. CNC process flow
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3. CNC advantage
In CNC machining, the control system sends out instructions to make the cutting tool make various movements with compound requirements. It is suitable for the machining of parts with many processes and can only be completed after multiple clamping and adjustment
Highly flexible and improve working conditions
High machining precision, stable and reliable machining quality
High productivity and modern production management
4. CNC application field
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6、 Anodic oxidation technology
1. Introduction to anodic oxidation: Anodic treatment is a process that uses the electrochemical principle to energize the metal substrate immersed in acidic electrolyte and form a porous film on its surface. The membrane can adsorb dyes to achieve the purpose of dyeing. Generally, aluminum alloy materials are widely used in this process.
2. Technological process
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3. Technical advantages
Aluminum alloy is characterized by low density and high strength. Its functionality and decoration can be strengthened after anodizing. Anodizing can realize any color except white, and two-color anodizing can also be realized by masking or removing part of the oxide layer. At present, nickel free sealing has been realized to meet the nickel free requirements of Europe, the United States and other countries.
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