Our precision turning parts products have many shapes, such as round or other shapes. Although these products have reached the customer’s appearance, they often choose post-surface treatment for aesthetics and corrosion resistance. General precision turning parts surface treatment includes electroplating, oil spraying, sandblasting, anodizing and so on. Today we focus on giving you an understanding of the hanging point oxidation problem of anodizing.
What is the surface treatment hanging point?
The precision turning parts product is oxidized like a protective film, which increases durability and corrosion resistance. We usually hang our products in a fixed position on the hanger before starting to oxidize. Since the contact point between the product and the hanger will precision turning parts produce an oxidation shielding point, we call it the hanging point.
Precautions
① Anodized precision turning parts can be installed on ordinary clothes hangers or special clothes hangers according to their shape and size.
②Before installation, the hanger must be corroded with alkali or use a file to remove the old oxide film on the surface of the hanger.
③When installing, the card must be installed firmly, but can not clamp the parts, especially the parts with threads precision turning machining parts.
④Use a medium hanger for large precision turning parts, tighten the bolts to prevent falling off when swinging up and down in the solution.
⑤For box-shaped parts, tube-shaped parts and precision turning machined parts with blind holes, the orifices of the parts must be upwards, so that the gas generated during anodization can be freely discharged, otherwise an air bag will be formed, and there will be no oxide film on the local surface.
⑥ Small precision turning parts such as aluminum rivets and washers can be installed in the rivet basket for anodizing treatment. Before installing it in the basket, corrode the rivets, expose them to light, and clean them. During oxidation, in order to increase the conductive contact and reduce the amount of repair, some aluminum chips (about 10%-20% of the volume of the rivet) can be added when the rivet is loaded into the basket, together with the rivet and washer. After it is full, add a gland and fix it up and down with aluminum nuts. After fixing it, you can shake it to hear if there is any loose sound. If the noise is loud, please tighten again, but do not tighten too much.
⑦Parts of the same material should be installed on one hanger, and precision turning parts of two materials should not be installed on one hanger.
⑧For anodized precision turning parts, if the parts or the entire surface are not allowed to have fixture traces, there should be a process margin for clamping.
⑨A certain distance should be maintained between each fixture to avoid collision between 6061 aluminum plate parts and precision turning parts. There should be a certain distance between the parts and the cathode, and the area around the cathode can be inspected with an aluminum rod before powering on.
Common problems and solutions
1. The hanging point is not oxidized
For anodized precision turning parts, if part or the entire surface is not allowed to have hanging points, there should be a process margin for card installation. The precision turning parts to be anodized can be hung on ordinary clothes hangers or special clothes hangers according to the shape and size. Keep a certain distance between each fixture to avoid 6061 aluminum plates.
2. How to anodize small precision turning parts
Small precision turning parts such as aluminum rivets and washers can be anodized in the rivet basket. Before installing in the basket, corrode the rivets, expose them to light, and clean them. During oxidation, in order to increase the conductive contact and reduce the amount of repair, some aluminum scraps can be added when the rivets are basketed and mixed with the rivets and gaskets. After it is full, add a gland and fasten it up and down with aluminum nuts.
3.The hanger is loose
After fixing it, you can shake it to hear if there is any loose sound. If there is a lot of noise, please tighten again, but do not tighten too much. Before the hanger is installed, it must be corroded with alkali or use a file to remove the old oxide film on the surface of the hanger.
4. Will the precision turning parts product be damaged when the hanger is installed?
When installing, it must be installed firmly, but the precision turning parts cannot be clamped, especially the parts with threads after processing. The large parts are installed on the medium hanger, and the bolts are tightened to prevent falling off when swinging up and down in the solution. Precision turning parts made of the same material should be installed on a hanger. Parts made of two materials are not allowed on a hanger.
Conclusion
We choose the hanger according to the shape and size of the precision turning parts product parts. If there are no hanging points on the part or the whole surface of the part, a process margin should be left during installation. Pay attention to the tightness of the fixture, so as not to affect the anodizing process and damage the precision turning parts.
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