Carbon Steel Galvanized Black Oxidation DIN Flange Weld Nut

Carbon Steel Galvanized Black Oxidation DIN Flange Weld Nut

Cold heading is one of the new techniques for metal pressure machining without cutting. It is a kind of plastic deformation produced by using metal under the action of external force, and with the help of mold, so that the metal volume is redistributed and transferred, so as to form the required parts or blank processing method. Cold heading process is most suitable for the production of bolts, screws, nuts, rivets, pins and other standard fasteners.

Description

The cold heading process is one of the new processes of metal pressure machining with little and no cutting. It is a processing method that uses the plastic deformation generated by the metal under the action of external force, and with the help of the mold, the metal volume is redistributed and transferred to form the required parts or blanks. The cold heading process is most suitable for the production of standard fasteners such as bolts, screws, nuts, rivets, and pins.

Operation process of black oxidation treatment:
Workpiece clamping → degreasing → cleaning → pickling → cleaning → oxidation → cleaning → saponification → hot water boiling and washing → inspection.

(1) Workpiece clamping: According to the shape and size of the work piece, a special fixture or spreader should be designed. The purpose is to leave enough gaps between the workpieces, the workpieces cannot contact each other, so that each workpiece can be completely immersed in the oxidizing solution to be oxidized.

(2) Degreasing: The purpose is to remove oil stains on the surface of the workpiece. After machining (bluing and blackening is the last process), the surface of the workpiece will inevitably not leave oil stains. This is especially true when using anti-rust oil for inter-process anti-rust. Any oil pollution will seriously affect the formation of ferroferric oxide, so it must be removed before turning blue and black.

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Questions:

1. Q: Are you a factory or a trading company?

A: We have our own factory and professional sales team.

2. Q: Can you provide free sample?

A: Standard existing sample for free; customized sample, we will charge sample fee and refund the sample fee once format order confirmed.

3. Q: What's your MOQ?

A: 1pc for stocked items, flexible MOQ for each customized design.

4. Q: What products do you mainly supply?

A: Standard and custom made items.

5. Q: What is your delivery time?

A: Around 3-4 days after payment for standard stock items; around 15-25 days after payment for customized order. The specific lead time depends on the products & quantity.

6. Q: What's your delivery method?

A: Any delivery method is available and supported. We can delivery by air-express, air cargo and by sea according to the order quantity or as customer required.

7. Q: Which port will you ship the goods ?

A: Normally Ningbo or Shanghai, China port. Other ports can be available.

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