The invention provides an annular powder feeding nozzle which comprises an upper portion, a middle portion and a lower portion which are sequentially connected The upper portion comprises a connecting block and an air blowing inner ring coaxially connected with the connecting block The middle portion comprises an adjusting inner ring connected with the connecting block and a height adjusting block At least one guide groove is formed in the outer side wall of the height adjusting block The lower portion comprises a powder feeding inner ring connected with the height adjusting block, a powder feeding outer ring and a water-cooled jacket in sealing connection with the powder feeding outer ring The tail end of the powder feeding inner ring and the tail end of the powder feeding outer ring are each in a conical shape An annular powder feeding channel is arranged between the powder feeding inner ring and the powder feeding outer ring A water-cooled channel is arranged between the water-cooled jacket and the powder feeding outer ring The annular powder feeding nozzle further comprises first jackscrews in butt joint in the guide grooves By means of the annular powder feeding nozzle, due to the fact that the powder feeding outer ring is directly cooled, the water flow is large, a cooling effect is good, and higher laser power can be borne

Annular powder feeding nozzle

The invention provides an eight-way coaxial powder feeding nozzle for double-layer gradient laser material increase manufacturing. In the laser cladding process, the eight-way coaxial powder feeding nozzle is used for feeding powder to achieve two-layer forming through one-time scanning. Distribution of eight powder feed ports is basically the same as distribution of four powder feed ports of a traditional four-way coaxial powder feeding nozzle. An interior four-way and exterior four-way distribution mode is adopted. It is guaranteed that the upper portion of the convergence point of the interior four-way sprayed powder of the nozzle adjoins with the convergence point of the exterior four-way sprayed powder of the nozzle. Through interior-way and exterior-way synchronous powder feeding, double cladding layers are formed through one-time scanning in the laser cladding process. The problem that the process adopting the traditional four-way powder feeding nozzle for gradient laser cladding is complicated is solved. The problem that cracks or other defects occur to the cladding layers due to layered forming is effectively avoided.

Eight-way coaxial powder feeding nozzle for double-layer gradient laser material increase manufacturing

The invention provides a double-layer-gradient laser material increase manufacturing method.The double-layer-gradient laser material increase manufacturing method includes the steps that the surface of a base material to be subjected to melted cladding is irradiated and scanned through a laser beam, metal powder is synchronously fed to the irradiation position of the laser beam in a multipath-powder-feeding mode, pipes for multipath powder feeding are divided into two sets, and two powder convergent points at the adjacent positions are formed through the metal powder fed by the two pipe sets respectively; the metal powder fed by the same-set pipes is same in material, the metal powder with high hardness is fed at the convergent point at the upper portion, and an inner cladding layer is formed; as the powder is synchronously fed through the inner path and the outer path, double melted cladding layers are once scanned and formed in the laser melted cladding process, the problem of the complex traditional gradient laser melted cladding technology is solved, and cracks and other defects, caused by layered molding, of the melted cladding layer are effectively overcome.

Double-layer-gradient laser material increase manufacturing method

The invention discloses a sieve hole built-in type annular laser cladding nozzle which comprises a laser head connection part, a middle part sleeve part and a nozzle part; the laser head connection part is composed of an upper connection sleeve which is connected with a laser head; the middle part sleeve part is composed of a sliding sleeve which is connected with the upper connection sleeve; protective glass is arranged between the lower end of the sliding sleeve and the upper end of a center sleeve; a protective glass water cooled jacket is in threaded connection with the sliding sleeve and the center sleeve; a protective gas hole is formed in the center sleeve; a nozzle part is composed of a conical nozzle core which is connected with the center sleeve; and the outer side of each of the conical nozzle core and the center sleeve is sequentially provided with a powder inlet sleeve, a gas inlet sleeve and a water cooled jacket. The sieve hole built-in type annular laser cladding nozzle overcomes the disadvantages that the service life is short, a powder convergence diameter cannot be regulated, and the existing laser cladding nozzle cannot be suitable for powder particles in different sizes.

Sieve hole built-in type annular laser cladding nozzle

The invention discloses a metal 3D printing device The device includes a working space, a processing table, a powder spreading system, a sintering system and a gas circulation system The powder spreading system includes a powder spreading head and a powder supplement mechanism The powder spreading head includes a shell, a vibrating motor, a sieve and a power mechanism A track is arranged on the processing table, a starting point and an end point are arranged on the track, a storage space is arranged in the shell, and the shell is provided with a powder supplement hole and a power outlet which is arranged downwards When the shell is located at the starting point, the powder supplement mechanism conveys powder into the storage space through the powder supplement hole, an open/close device is arranged at the powder outlet and includes an open/close motor, a baffle and a transmission mechanism, the open/close motor is fixed on the shell, a baffle is slidably arranged on the shell, thetransmission mechanism is connected with the open/close motor and the baffle so as to drive the baffle to move when the open/close motor rotates, and the powder outlet is thus closed or opened Metalpowder is conveyed and spread in stages to reduce the amount of transported metal powder at a time, the energy required for transporting the metal powder is thus reduced and the energy is saved

Metal 3D printing device

A powder feeding mechanism comprises an upper part, a middle part and a lower part, wherein the upper part, the middle part and the lower part are sequentially connected The upper part comprises a connection module connected with a laser head The middle part comprises an inner centering ring connected with the connection module and a height adjusting block connected with the inner centering ring The outer side wall of the height adjusting block is provided with a cooling groove The lower part comprises a powder feeding head and a powder feeding pipe The height adjusting block is sleeved with the powder feeding head through sealing rings The powder feeding head is provided with a powder feeding channel and a water cooling channel spaced from the powder feeding channel The powder feeding pipe is arranged inside the powder feeding channel The water cooling channel is communicated with the cooling groove The water cooling channel and the cooling groove are located between the sealing rings so that cooling media in the water cooling channel can be sealed in the water cooling channel and the cooling groove According to the powder feeding mechanism, due to the fact that a cavity which is large in volume is formed between the powder feeding head and the height adjusting block, the water flow rate is higher, the cooling effect is better, and the higher laser power can be borne

Powder feeding mechanism

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Powder feeding mechanism