Additive manufacturing is a recent trend in production processes owing to its many benefits. It can be defined as the process of producing parts through the deposition of material in a layer-by-lay...

https://journals.sagepub.com/doi/pdf/10.1177/1687814018822880

Additive manufacturing: Challenges, trends, and applications:

https://digitalcommons.mtu.edu/cgi/viewcontent.cgi?article=3057&context=michigantech-p

Plastic recycling in additive manufacturing: A systematic literature review and opportunities for the circular economy

Additive Manufacturing of Piezoelectric Materials

In the present study Inconel 625 alloy fabricated using Cold Metal Transfer (CMT) Wire Arc Additive Manufacturing (WAAM) has been investigated. The microstructure and mechanical properties of the fabricated Inconel625 alloy, and the influence of torch travel speed on the properties of the manufactured specimens were researched. Microstructural studies revealed variation in microstructure in different layers of the specimen, with the bottom layer consisting of fine primary cellular grains. Mechanical properties that include hardness and tensile properties showed that with the increase in the travel speed, average micro-hardness of the manufactured specimens slightly improved from 248 HV to 253 HV. The ultimate tensile strength (UTS) increased from 647 MPa to 687 MPa, while yield strength (YS) increased from 376 MPa to 400 MPa. Results showed that the mechanical performance of the manufactured components by CMT-WAAM method was better than the mechanical properties of Inconel 625 alloy casting parts except UTS, which demonstrated that the Inconel 625 alloys can be fabricated by cold metal transfer process.

Microstructure and mechanical properties of Inconel 625 fabricated by wire-arc additive manufacturing

Considering the stringent regulations, manufacturing of aircraft parts is often quite complex and time consuming. The multi-million components, multi-tier manufacturing systems and the severe constraints surrounding the sector lead to heavy inventory investments to achieve the just-in-time supply of parts often needed to reduce the airplane ground times. Additive manufacturing evolved allowing for the direct production of complex parts based on digital data with no complex tooling or machinery, a messiah of true just in time production. Appropriate integration of additive manufacturing with the aircraft industry could resolve some of the supply chain and inventory hurdles. Significant progress is already evident in these lines, but the lack of quality assurance attributes and certification standards is hampering the progress. The state-of-the-art of the application of additive manufacturing in the aircraft industry is reviewed in this paper.

https://www.longdom.org/articles/additive-manufacturing-for-the-aircraft-industry-a-review.pdf

Additive Manufacturing for the Aircraft Industry: A Review.

The paper first presents a brief review of development courses of additive manufacturing technology and summarizes the development status and the application fields of additive manufacturing technology, then, according to the manufacturing methods, it focuses on the principles and characteristics of several main additive manufacturing technologies. This paper also analyzes the existing problems and challenges of additive manufacturing technology and its future development trend. This paper aims to provide references for the development direction of additive manufacturing technology in developing countries.

The research status and development trend of additive manufacturing technology

A scraping-wheel drill bit with a bit body configured at its upper extend for connection into a drillstring, comprising: a bit body ( 1 ) with at least one bit leg ( 3 ), and at least one scraping-wheel ( 2 ) set with a cutter-row ( 4 ). The scraping-wheel ( 2 ) is mounted for rotation on the corresponding bit leg ( 3 ) with a large angular deflection α which lies in the range of 20°≦|α|≦90°. The cutters on the scraping-wheel break rocks by means of successive scraping, forming a spiral-like tracks on the bottomhole, thus achieving high rock-breaking efficiency, even wear, high cooling performance, and a longer service life for the cutters, bearings and the drill bit.

Scraping-wheel drill bit

A composite drill bit with a bit body configured at its upper extend for connection into a drillstring, comprising: a bit body (1) with at least one bit leg (3), at least one scraping-wheel (2) set with a cutter-row (4), and a set of cutters fixed thereon. The scraping-wheel (2) is mounted for rotation on the corresponding bit leg (3) with a large angular deflection α in the range of 20°≦|α|≦90°. The cutters on the scraping-wheel break rock by means of successive scraping, forming a cross-cutting area on the bottomhole accompanied by the cutters on the fixed cutting unit, thus achieving high rock-breaking efficiency, even wear, high cooling performance, and a longer service life for the cutters, bearings and the drill bit.

Composite drill bit

The utility model discloses a rotary teeth mono -cone bit belongs to drilling equipment technical field such as oil and natural gas, mine engineering, building foundation engineering construction, geology, the hydrology, including the bit body, and rotate and connect the gear wheel on the bit body, be provided with the cutting teeth on the gear wheel, cutting teeth on the gear wheel has at least one to be the rotary teeth, the rotary teeth forms to rotate with the gear wheel to be connected, the rotation axis skew of the geometric centre relative rotation tooth in the preceding cutting face of rotary teeth or the preceding cutting face of rotary teeth, and the geometric centre in the back cutting face of rotary teeth or back cutting face is skew side's homonymy in cutting face in the front, preceding cutting face back relatively is close to the rotation axis of rotary teeth, and can be rotatory on the gear wheel around rotation axis. The utility model provides an unable problem that adopts composite tooth (for example PDC tooth) of prior art roller bit, when it adopted the cutting teeth (like carbide tooth) unanimous with prior art simultaneously, the wearing and tearing and the wearing and tearing passivation speed of cutting teeth were also all better.

Rotary teeth mono -cone bit

A rotating cutter single cone bit includes a bit body and a cone that is rotatably coupled to the bit body. Cutters are arranged on the cone. At least one cutter on the cone is a rotating cutter. The rotating cutter forms a rotational connection with the cone. The geometric center of the front cutting face of the rotating cutter or the front cutting face of the rotating cutter is offset from the rotating axis of the rotating cutter, and the geometric center of the rear cutting face or the rear cutting face of the rotating cutter is on the same side of the offset of the front cutting face. The front cutting face is closer to the rotating axis of the rotating cutter than the rear cutting face. The rotating cutter is rotatable about the rotating axis of the rotating cutter on the cone.

Ren Haitao

Papers

The research status and development trend of additive manufacturing technology

Scraping-wheel drill bit

Composite drill bit

Rotary teeth mono -cone bit

Rotating cutter single cone bit