CN108359980B

CN108359980B - Grinding-assisted laser cladding composite powder feeder

Info

Publication number: CN108359980B
Application number: CN201810442191.5A
Authority: CN
Inventors: 简明德; 简慈萱; 黄炜盛; 简嘉谊
Original assignee: Fujian University of Technology
Current assignee: Fujian University of Technology
Priority date: 2018-05-10
Filing date: 2018-05-10
Publication date: 2019-12-13
Anticipated expiration: 2038-05-10
Also published as: WO2019214428A1; CN108359980A

Abstract

The invention provides a grinding auxiliary laser cladding composite powder feeder, which comprises a box body, a powder feeding pipe, a rotary upper disk and a grinding lower disk, wherein the box body is divided into an upper opening, a middle section and a lower opening; the invention has the advantages that: 1. by grinding the composite powder, the problems of uneven mixing of the composite powder and powder agglomeration are solved; 2. an induction heating coil is additionally arranged, so that the dryness of the mixed powder is improved, and the problem of powder agglomeration is solved; 3. the oscillator is additionally arranged, the mixed powder after grinding is subjected to oscillation mixing and screening again, and the powder after grinding is more uniform during powder discharging.

Description

Grinding-assisted laser cladding composite powder feeder

Technical Field

the invention relates to a laser cladding technology, in particular to a grinding-assisted laser cladding composite powder feeder.

background

Laser cladding is a new surface modification technology, and materials are clad on the surface of a base material, so that the aim of improving the performance of the base material is fulfilled.

At present, a plurality of cladding layer materials for laser cladding are available, such as ceramic powder, various nickel-based alloy iron-based alloys and the like, but the single type of powder is difficult to meet the cladding requirement. For example, the cladding material WC can improve the hardness and the wear resistance of a matrix due to the characteristics of the cladding material, but the matrix is brittle, and a reinforcing item is often required to be added for assistance.

The defects of the prior art are as follows: before cladding, the composite powder needs to be subjected to a great deal of work on the mixing uniformity and powder agglomeration problem of the composite powder, so that the cladding is time-consuming in the early stage, long in period of each cladding and low in efficiency.

Disclosure of Invention

The invention aims to solve the technical problem and provides a grinding-assisted laser cladding composite powder feeder.

The invention is realized by the following steps:

the utility model provides a grind supplementary laser cladding composite powder feeder, includes the box, send the powder pipe, rotates the hanging wall and grinds the lower wall, the box divide into opening, middle section and under shed, send the powder pipe setting to be in the upper shed with the inside on the upper portion of middle section, it sets up to rotate the hanging wall and grind the lower wall in the middle section, just grind lower wall fixed connection the inner wall in middle section, it acts on to rotate the hanging wall the grinding lower wall, rotate the hanging wall with grind the lower wall and all set up a plurality of through-holes.

Preferably, the powder feeding device further comprises an induction heating coil, and the induction heating coil is arranged around the rotary upper disc or the powder feeding pipe.

Preferably, the grinding machine further comprises an oscillator, the oscillator is fixedly arranged on the inner wall of the middle section and located below the grinding lower disc, and a plurality of sieve holes are formed in the oscillator.

Preferably, a flow meter is also included, which controls the flow of powder into the mill.

Preferably, the flow meter further comprises a controller, wherein the controller controls the oscillator and the flow meter.

Preferably, the size of the sieve holes on the shaker is twice the unit size of the powder being ground.

Preferably, the size of the through hole of the lower grinding disc is 0.7-0.8 times of the unit size of the ground powder.

Preferably, the through holes of the rotating upper disk are larger than the unit size of the powder to be ground.

Preferably, the air conditioner further comprises an air inlet hole, and the air inlet hole is arranged at the lower opening.

Preferably, the upper opening and the lower opening are narrow, and the volume of the middle section is large; the lower end of the powder feeding pipe is covered above the rotary upper disc.

The invention has the following advantages:

1. By grinding the composite powder, the problems of uneven mixing of the composite powder and powder agglomeration are solved.

2. The induction heating coil is additionally arranged, so that the dryness of the mixed powder is improved, and the problem of powder agglomeration is favorably solved.

3. The oscillator is additionally arranged, the mixed powder after grinding is subjected to oscillation mixing and screening again, and the powder after grinding is more uniform during powder discharging.

4. And a flowmeter is additionally arranged to control the flow of the composite powder entering grinding.

5. The controller is additionally arranged, so that the parameters of the flowmeter and the oscillator can be adjusted, and the invention is more flexible to use.

6. The gas inlet is additionally arranged, and the powder after being ground is pressed and fed by inert gas through the gas inlet, so that the powder can leave the powder grinding device more quickly.

7. The lower end of the powder feeding pipe is covered above the rotary upper disc, so that the moving space of powder is reduced, and the powder is ensured to be ground.

drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a schematic view of the apparatus according to the present invention.

The symbols are as follows:

A box body 1; an upper opening 11; a middle section 12; a lower opening 13; a powder feeding pipe 2; the upper disc 3 is rotated; grinding the lower disc 4; an induction heating coil 5; an oscillator 6; a flow meter 7; an air inlet hole 8; a through hole 9; mesh 10.

Detailed Description

As shown in fig. 1, a grinding-assisted laser cladding composite powder feeder comprises a box 1, a powder feeding pipe 2, an upper rotating disc 3, a lower grinding disc 4, an induction heating coil 5, an oscillator 6, a flowmeter 7, a controller (not shown) and an air inlet 8, wherein the box 1 is divided into an upper opening 11, a middle section 12 and a lower opening 13, the upper opening 11 and the lower opening 13 are narrow, and the middle section 12 has a large volume; the powder feeding pipe 2 is arranged in the upper part of the upper opening 11 and the middle section 12, and the lower end of the powder feeding pipe 2 is covered above the upper rotary disc 3; the upper rotating disc 3 and the lower grinding disc 4 are arranged in the middle section 12, the lower grinding disc 4 is fixedly connected with the inner wall of the middle section 12, the upper rotating disc 3 acts on the lower grinding disc 4, the upper rotating disc 3 and the lower grinding disc 4 are both provided with a plurality of through holes 9, the through holes 9 of the upper rotating disc 3 are larger than the unit size of the powder to be ground, and the size of the through holes 9 of the lower grinding disc 4 is 0.7-0.8 times of the unit size of the powder to be ground; the induction heating coil 5 is arranged around the upper rotating disc 3 or the powder feeding pipe 2, the oscillator 6 is fixedly arranged on the inner wall of the middle section 12 and is positioned below the lower grinding disc 4, a plurality of sieve holes 10 are arranged on the oscillator 6, and the size of the sieve holes 10 on the oscillator 6 is twice of the unit size of the powder to be ground; the flow meter 7 controls the flow of powder into the mill; the controller (not shown) controls the oscillator 6 and the flow meter 7; the intake holes 8 are provided in the lower opening 13.

the operation steps of the invention are as follows:

Step 1, turning on an induction heater, and heating to 100-200 ℃.

Step 2, adding various powders to be ground from the powder feeding pipe 2; the flow of powder into the mill is controlled by a flow meter 7.

Step 3, opening a driver, and rotating the upper disc 3 to start rotating; turning on the oscillator 6;

Powder enters from the powder feeding pipe 2 and falls to the middle position between the upper rotating disc 3 and the lower grinding disc 4 through the through hole 9 of the upper rotating disc 3 for grinding, when the powder is sufficiently refined, the powder falls to the oscillator 6 from the through hole 9 of the lower grinding disc 4 through the rotation of the upper rotating disc 3, the oscillator 6 carries out oscillation mixing and screening on the ground mixed powder again, and meanwhile, the ground powder is more uniform when being discharged; the shaken powder continues to fall down to the lower opening 13.

And 4, delivering the ground powder by inert gas through a gas inlet so that the powder can more quickly leave the laser cladding device and enter the next stage of laser cladding.

The action sequence of the step 2 and the step 3 is adjustable; the inert gas can also be applied to the powder feeding pipe 2 to feed the powder, and the powder is pressed to enter the upper part of the rotary upper disc 3 more quickly; the parameters of the flow meter 7 and the oscillator 6 are adjustable by a controller (not shown), so that the invention is more flexible to use.

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims

1. The utility model provides a compound powder feeder of supplementary laser cladding that grinds which characterized in that: the powder feeding pipe is arranged inside the upper opening and the upper part of the middle section, the upper rotating disc and the lower grinding disc are arranged in the middle section, the lower grinding disc is fixedly connected with the inner wall of the middle section, the upper rotating disc acts on the lower grinding disc, and a plurality of through holes are formed in the upper rotating disc and the lower grinding disc; the through hole of the upper rotating disc is larger than the unit size of the powder to be ground, and the size of the through hole of the lower grinding disc is 0.7-0.8 times of the unit size of the powder to be ground; the powder feeding device also comprises an induction heating coil, wherein the induction heating coil is arranged around the rotary upper disc or the powder feeding pipe; the flow meter is used for controlling the flow of the composite powder entering the grinding; the powder feeding pipe is arranged on the lower opening and is provided with a powder feeding hole; the grinding machine also comprises an oscillator, wherein the oscillator is fixedly arranged on the inner wall of the middle section and is positioned below the grinding lower disc, and a plurality of sieve holes are formed in the oscillator.

2. The grinding-assisted laser cladding composite powder feeder according to claim 1, characterized in that: the flow meter further comprises a controller, wherein the controller controls the oscillator and the flow meter.

3. The grinding-assisted laser cladding composite powder feeder according to claim 1, characterized in that: the size of the sieve holes on the oscillator is twice the unit size of the powder to be ground.

4. The grinding-assisted laser cladding composite powder feeder according to claim 1, characterized in that: the upper opening and the lower opening are narrow and small, and the volume of the middle section is large; the lower end of the powder feeding pipe is covered above the rotary upper disc.