Secondary Machining

Secondary processing often refers to the process of using CNC machine tools for reprocessing after rapid prototyping, including welding, boring, reaming, closing tolerance holes, or tapping tolerance holes that require threads. Depending on the material, various types of inserts can be inserted using hot piles or adhesive.

Processing technology：

(1) Welding

Welding, also known as fusion, is a manufacturing process and technology that involves joining metals or other thermoplastic materials such as plastics through heating, high temperature, or high pressure.

There are many sources of energy for modern welding, including gas flames, electric arcs, lasers, electron beams, friction, and ultrasonic waves. In addition to being used in factories, welding can also be carried out in various environments such as the wild, underwater, and space. No matter where it is, welding may pose a danger to the operator, so appropriate protective measures must be taken during welding. Welding may cause injuries to the human body, including burns, electric shock, visual impairment, inhalation of toxic gases, and excessive exposure to ultraviolet radiation.

Due to the size limitations of SLM process metal printing, welding technology is often required to complete the final cost manufacturing for some large-sized workpieces and mold requirements.

(2) Boring hole

Boring refers to the further processing of reserved holes on printed parts. Boring can enlarge the aperture, improve accuracy, reduce surface roughness, and also effectively correct the deviation of the original hole axis.

Boring can be divided into rough boring, semi precision boring, and precision boring. The dimensional accuracy of precision boring can reach IT8~IT7, and the surface roughness Ra value is 1.6~0.8 μ m.

Boring is divided into general boring and deep hole boring. General boring can be done on a regular lathe, and the boring tool can be fixed on the lathe tailstock or on the small knife holder. Deep hole boring requires a dedicated deep hole drilling and boring machine. The boring tool needs to be equipped with a boring rod, and a hydraulic pump station needs to be added to remove iron filings using coolant.

(3) Hinge hole

Reaming is a method in which a reamer removes a small amount of metal layer from the wall of a printed part hole to improve its dimensional accuracy and hole surface quality. Reaping is one of the precision machining methods for holes, which is widely used in production. For smaller holes, reaming is a more economical and practical machining method compared to internal grinding and precision boring.

Commonly used are: integral cylindrical machine reamers and hand reamers, adjustable hand reamers, and spiral groove hand reamers.