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What are the post-treatment processes for the hand plate model

Oct 28,20

What are the post-treatment processes for the hand plate model

In order to make a good delicate hand plate model, subsequent processing is also indispensable, the following is some commonly used processes for making hand plate model.

Common surface treatments for metallic materials are: electroplating, vacuum electroplating, blackening, passivation, sandblasting, etching, wire drawing, paint baking, grinding, polishing, oxidation, radium carving, water plating (aluminum-copper), passivation and blackening for steel.
Common surface treatment of plastic parts: spray painting, printing, biting, electroplating, vacuum plating, sandblasting, water plating (ABS water plating can not be removed).
  1. Grinding: Abrasive paper is used to rub the appearance of the product to remove burrs, machining lines, adhesion marks and other defects on the surface of the product, so as to improve the roughness of the product, reduce roughness, and make the surface of the product smooth and fine.
  2. sandblasting,wind pass the sandblasting machine will be sand to the product surface, formed in the surface layer with pits, because the abrasive impact to the product surface and the cutting effect, make the surface of the product must be cleanliness and different roughness of the work piece can improve the mechanical properties of the surface, thus improve the fatigue resistance of the product, increase the adhesion between product and spray coating, extend the durability of the paint film, and conducive to the flow of paint and decoration.

3.Polishing: The modification of the surface of the product by using flexible polishing tools and abrasive particles or other polishing media on the basis of grinding.Polishing does not improve the dimensional or geometric shape accuracy of the product, but aims at obtaining a smooth surface or mirror gloss, and is sometimes used to eliminate gloss (matting).The surface roughness of the polished product is generally up to Ra0.63 ~ 0.01 micron.PMMA transparent product needs very high polishing requirements, so the price of PMMA transparent parts is very expensive, more than 4 times that of ordinary ABS parts.
4.Electroplating: By chemical reaction, a layer of other metals is attached to the surface of the material to increase the corrosion resistance of the metal, or change the size, and to achieve a certain beautifying appearance. It is a common surface treatment method, such as electric galvanizing, electroplating nickel, etc..Electroplating is generally divided into wet electroplating and dry electroplating.The wet process is commonly referred to as water plating;Dry process is commonly said to be vacuum plating.
5.spraying (powder spraying) : electrostatic spraying is the use of corona discharge phenomenon to make the powder coating adsorbed on the product.The process goes like this:Powder for powder by system by gas into the compressed air spray gun, in high voltage electrostatic spray gun front-end with seizure attack, high-pressure because of corona discharge, near its attacks with charge, powder by the gun nozzle jet, a coating of charged particles, it is the effect of electrostatic force, sucked into its polar opposite product, follow to spray the powder on the increase, the more charge accumulation, when reach the thickness must be, because the onset of electrostatic exclusion effect, will not continue adsorption, and then make the product must be the thickness of the powder coating, and then after heat to make powder melt and flow flat, curing, namely in the product appearance form a hard coating.Advantages and disadvantages of electrostatic powder spraying: no need of diluent, little toxicity, no pollution of the environment, good coating quality, high adhesion and mechanical strength, corrosion resistance, short curing time, no primer, low skill requirements of workers, high recovery and application rate of powder;The coating is very thick, the external effect is wavy, not slippery, can only process the semi-matte, the bright two external effects.
6. Printing:
(1) Screen printing:
In the process of screen printing on the surface of materials, there are generally two ways of screen printing and pad printing, the main principle and camera film imaging principle, is also an exposure process.Flat screen printing is mainly used on the general plane, but if there are deep pits, you need to use pad printing.
Advantages of screen printing:
一、 Low cost, quick results.
二、Adapt to printing on irregular substrate surface.
三、 Strong adhesion and good inking.
四、 Thick ink layer and strong three-dimensional sense.
五、 Strong optical spin resistance and good color performance.
六、Wide range of printing objects and materials, and large printing size.

(2) Pad printing (curved printing) : It refers to the use of a piece of flexible rubber to print characters and patterns to a surface containing curved or slightly concave plastic shapes.Pad printing is the process of first putting ink into gravure plates with engraved characters or patterns, then copying the characters or patterns onto rubber, then transferring the characters or patterns onto the surface of plastic molding products using rubber, and finally curing the ink by heat treatment or ultraviolet light irradiation.
7. Radium Carving:
Laser engraving, also known as laser engraving, is a process of surface treatment using optical principles.For example to do a keyboard, it on surface word have blue, green, red and grey, the key body is white, laser engraving, the first injection, blue, green, red, grey words each spray the corresponding color, it looks like the blue key, the green key button, such as whole spray a layer of white again, this is a piece of white keyboard, the blue and green are folded in the below.Then, by using laser technology and the film made of the button diagram submitted by industrial designers, the white oil is carved off and the symbol keys such as blue and green are presented.
Limitations of radium carving:
(1) Depth of radium vulture: AL is 0.1mm, spray paint coating of plastic: 0.2-0.3mm, iron and other metals up to 0.08mm;
(2) The limit surface area of the radium vulture is 100X100mm. Over 100X100mm, the radium vulture needs to be splicing. The joint position is not beautiful and the cohesion marks are obvious.
(3), white and nearly white color can not be carved out, curved radium carved out of the character is prone to deformation;
8, drawing: drawing processing is after grinding products in the appearance of the product to form a line, decoration effect of a kind of appearance processing technique.Wire drawing can be a good performance of the metal material texture, the metal surface can obtain non-mirror like metallic luster.According to the appearance of the different can be divided into straight silk (hair silk) and random silk (snow stripe).The difference in the type of silk weave is highly subjective.Each user has different requirements for the appearance of lines and different preferences for the effect of lines, so it is necessary to have drawn samples to process the effect that users like to meet.Arc (arc and face junction is very ugly, drawing is not uniform) and paint (metal color appearance can pull fine silk) are not suitable for drawing.
9. Passivation:
Under certain conditions, when the potential of the metal moves in the positive direction due to the applied anode current or local anode current, the surface state of the previously active dissolved metal will change abruptly.The dissolution rate of the metal drops sharply.This process of abrupt change of surface state is called passivation.Passivation can improve the passivation performance of metal materials, promote the passivation of metal materials in the service environment, improve the mechanical strength of metal, is one of the most effective ways of corrosion control, enhance the adhesion of metal and coating.
10. Black:
Surface blackening treatment, also known as bluing.Blackening treatment now commonly used methods have the traditional alkaline heating blackening and the appearance of late room temperature blackening two kinds.The resulting black film improves the corrosion resistance and mechanical strength of the metal surface, and also serves as a good substrate for the coating.(Stainless steel should not be blackened; iron has the best blackening effect)