WO2015180639A1

WO2015180639A1 - System for manufacturing and forming resistance-type double-melting stacking three-dimensional metal member

Info

Publication number: WO2015180639A1
Application number: PCT/CN2015/079890
Authority: WO
Inventors: 赵晴堂
Original assignee: 赵晴堂
Priority date: 2014-05-28
Filing date: 2015-05-27
Publication date: 2015-12-03
Also published as: CN104001918A; CN104001918B

Abstract

Disclosed is a system for manufacturing and forming a resistance-type double-melting stacking three-dimensional metal member, wherein a resistor is used to heat materials, and a secondary re-melting method is adopted to rapidly manufacture metal parts. The system comprises a melting and forming system, a material release system, a cooling and antioxidant conveying system, and a high-power power source. The melting and forming system comprises a base (1), a cooler (3), a forming head (2), and a forming table (4). The material release system comprises a fuse volume (9) and a fuse volume motor (8) for releasing a fuse (7). The cooling and antioxidant conveying system comprises a liquid inert gas storage and evaporating tank (11), an air pump (10), an anti-oxidation protection pipe (6), and a connecting pipeline. The forming head (2) comprises a fuse conveyer (17), a graphite electrode inside a molten bath (15), and a graphite electrode outside a molten bath (5). The forming system enables rapid three-dimensional forming of a metal part, and solves the problems of high cost, low density of the manufactured part and poor quality in the prior art.

Description

Resistive double-melt laminated three-dimensional metal member manufacturing forming system

Technical field

The present invention relates to the field of processing and manufacturing, and more particularly to a system for rapid three-dimensional forming of metal parts.

Background technique

With the advancement of science, "3d manufacturing technology" has developed rapidly and vigorously. The current technology has been able to directly manufacture metal parts, but the parts produced are not as good as the same parts made by conventional cutting due to the low density of voids or slag in the tissue. The reason is that the raw material used for manufacturing the parts is powder. Taking the (SLM) technology as an example, if the metal powder is not melted uniformly by the laser, a large number of metal balls are formed, which causes the powder roller to be The friction during the laying process produces a large friction, which not only damages the quality of the parts, but also hinders the movement of the spreading roller, which eventually leads to the failure of the forming of the parts.

The metal heating and melting system of the current metal component "3d manufacturing technology" is very complicated and large, and the efficiency is low, and some have certain dangers. There are three main types of melting systems today: laser melting systems, electron beam melting systems, and plasma melting systems. The advantage of the laser melting system is that the temperature is high and the power is easy to control. The disadvantages are that it is very complicated, bulky, easy to damage, and low in efficiency (up to about 30%). The advantages of the electron beam melting system are high power and high efficiency. The disadvantage is that the strong X-ray radiation generated during work is harmful to the human body and requires a very thick radiation shielding layer. The advantage of the plasma melting system is that the system is simple and harmless to the human body, and the disadvantage is that the manufacturing precision is low.

Summary of the invention

The technical problem solved by the present invention is to provide a system for rapid three-dimensional forming of metal parts to solve the above-mentioned shortcomings in the background art.

The technical problem solved by the present invention is implemented by the following technical solutions:

Resistive double-melting laminated three-dimensional metal component manufacturing forming system utilizes electrical energy to directly convert electrical energy into thermal energy to melt metal materials by electrical resistance of metal materials, and uses metal remelting method to manufacture metal materials by liquid extrusion lamination. member. Thereby reducing the cost and manufacturing difficulty and improving the quality of the components.

The resistive double-melt laminated three-dimensional metal component manufacturing forming system consists of a melt forming system, a material release system, a cooling and anti-oxidant delivery system, and a high-power power supply. The melt forming system includes a base, a cooler, a forming head, and a forming table.

The cooler wraps the inner part of the forming head, and has a plurality of cooling gas inlets located at a position of the cooler surface near the base, and a cooling gas nozzle is located at a front portion of the forming head and lower than the graphite electrode outside the molten pool, the cooler Can be cooled and formed The inert cooling gas ejected from the head cools the liquid metal for rapid solidification, and the ejected gas can be wrapped on the surface of the workpiece semi-finished product so as not to be oxidized to form an oxide film.

The function of the pedestal is to position the forming head and the cooler. The base is connected to the servo motor or stepper motor and moved to the specified position by computer control.

The forming head comprises a head body, a fuse conveyor, a molten pool, a graphite electrode in the molten pool, and a graphite electrode outside the molten pool. The head body is fixed on the base, and the vent pipe in the forming head conveys the inert cooling gas in the oxidation protection tube to the cooler.

The fuse conveyor is located in the head body and is two runners driven by a motor. The pair of coil clamping fuses rely on friction to transport the fuses into the molten pool.

The molten pool is located in a high temperature resistant high temperature ceramic of the head material.

The graphite electrodes in the molten pool are respectively located inside the molten pool, and the electrodes are in a state of long-term energization. When the metal fuses are transported to the molten pool, the metal fuse contacts a pair of graphite electrode circuits in the molten pool to form a passage, and the electric energy is made of a metal fuse. The resistance is converted into heat and the metal fuse is melted.

The graphite electrode outside the molten pool is located at the tip of the forming head, and the electrode is in a state of long-term energization. When the liquid metal flows through the molten pool to the graphite electrode outside the molten pool and flows out, the liquid metal contacts the forming table, and the workpiece or forming table on the forming table And the graphite electrode outside the molten pool forms a current path through the liquid metal to heat the liquid metal again, and if there is a workpiece semi-finished product, the surface of the workpiece semi-finished product is once again melted, so that the new metal layer will be more closely combined with the original metal layer. together.

The forming table is a metal plate having a graphite layer on its surface, and the forming table is energized to form an electric circuit with the graphite electrode outside the molten pool.

The material release system consists of a fuse roll and a fuse roll motor.

The fuse coil has a bobbin shape and is wound with a metal fuse.

The fuse is a metal material.

The fuse winding motor is a stepping motor, which is connected to the fuse coil, and determines how much the fuse is discharged according to the pulse electric signal given by the computer.

The cooling and anti-oxidant delivery system consists of a liquid inert gas storage evaporation can, an air pump, an oxidation protection tube and a connecting pipe.

The liquid inert gas storage evaporation tank is a tank for storing liquid gas, and the surface has a corrugation to increase the surface area to accelerate the evaporation of liquid nitrogen.

The air pump connects the anti-oxidation protection tube and the cooler through a connecting pipe.

The anti-oxidation protection tube is composed of a tube body and a rubber sealing port, and is filled with an inert gas. The anti-oxidation protection tube is connected to the forming head and the air pump, and the fuse enters the forming head through the anti-oxidation protection tube, which can prevent the fuse from being oxidized and contaminated.

The high power power source is two step-down current transformers. One is for the graphite electrode in a pair of molten pools, one for The graphite electrode and the forming station outside the molten pool are powered.

Advantageous Effects: The present invention is a novel three-dimensional metal part manufacturing forming system, and the resistance heating simplifies the system and reduces the cost. The groundbreaking double-melting method combines the new surface with the already formed surface more tightly when manufacturing the workpiece to improve product quality. The entire system not only greatly reduces manufacturing costs but also improves product quality.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

2 is a schematic view showing the structure of a forming head and a cooler of the present invention.

In the figure: pedestal 1 forming head 2 cooler 3 forming table 4 molten pool outside graphite electrode 5 anti-oxidation protection tube 6 fuse 7 fuse winding motor 8 fuse roll 9 air pump 10 liquid inert gas storage evaporation tank 11 graphite inside the molten pool Electrode power supply 12 Electrode outside the graphite electrode Power supply 13 Rubber sealing port 14 Inside the molten pool Graphite electrode 15 Forming head vent pipe 16 Fuse conveyor 17 Cooling inert gas inlet 18 Fuse inlet 19 Cooling gas vent 20.

detailed description

In order to make the technical means, creative features, achievement goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

Referring to Figure 1-2, the resistive double-melt laminated three-dimensional metal component manufacturing forming system consists of a material release system, a melt forming system, a cooling and anti-oxidant delivery system, and a high-power power supply. The material release system includes a fuse roll 9 fuse roll motor 8, which initiates the discharge of the fuse 7 from the fuse roll 9 when the forming head 2 is moved to the designated position. The cooling and anti-oxidation system is composed of an anti-oxidation protection tube 6 air pump 10, a liquid inert gas storage evaporation tank 11, and the fuse is discharged and then enters the anti-oxidation protection tube 6 through the rubber sealing port 14, and the anti-oxidation protection tube 6 can be cooled by using an inert gas for cooling. And protecting the fuse 7 to prevent the fuse 7 from being oxidized by the heat conducted by the forming head 2 before use. The air pump 10 can deliver the cooling inert gas in the liquid inert gas storage evaporation can 11 to the cooler 3 and the oxidation protection pipe 6 in the melt forming system including the susceptor, the cooler 3, the forming head 2, and the forming table 4. The cooler 3 is a metal casing shell wrapped around the outside of the forming head 2, and a plurality of cooling inert gas inlets 18 are provided outside the position of the susceptor 1. A cooling gas vent 20 is located at the front of the forming head and the like is higher than the forming head. 2. The forming head 20 includes a graphite electrode 15 in the molten pool of the fuse conveyor 17, and the graphite electrode 5 outside the molten pool is fixed on the base 1 with a plurality of pairs of forming head inner venting tubes 16 for inerting the oxidation protecting tube. The cooling gas is delivered to the cooler 3. The fuse conveyor 17 is located in the head body and is two runners driven by the motor. The pair of runners convey the fuses to the molten pool by frictional force according to the clamping fuses. The graphite electrode 15 in the molten pool is a pair of electrodes located inside the forming head. When the fuse 7 contacts the two electrodes, the fuse is melted. The graphite electrode 5 outside the molten pool is an electrode outside the forming head, and the graphite electrode 5 outside the molten pool forms an electric circuit with the forming table 4. When the fuse is melted by the graphite electrode 15 in the molten pool and flows through the graphite electrode 5 outside the molten pool to the forming table 4, the graphite electrode 5 outside the molten pool forms a passage with the forming table 4, and the molten metal is heated again, if there is a positive on the forming table The workpiece is manufactured, when the molten metal contacts the last formed surface of the workpiece, the last formed table The surface is melted again and the new metal material is tightly integrated with the already formed metal material. The high-power power supplies 12 and 13 are two AC buck-up transformers that can withstand large operating currents.

In the invention, when the workpiece is manufactured, the fuse enters the molten pool and the electrode is melted and then flows out from the outer electrode of the molten pool to the forming table to be heated again. If the workpiece is being fabricated on the forming table, when the molten metal contacts the workpiece, the last formed shape On the surface, the last formed surface will be melted again, and the new metal material will be tightly integrated with the already formed metal material. The inert cooling gas ejected from the cooler can cool and protect the workpiece being manufactured while forming a good crystallization environment for external cooling inside the part being formed, so that the newly laid metal layer and the last laid metal layer are very good. integrate.

The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, and that the present invention is only described in the foregoing description and the description of the present invention, without departing from the spirit and scope of the invention. Various changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.

Claims

The resistive double-melt laminated three-dimensional metal member manufacturing forming system is composed of a melt forming system, a material release system, a cooling and anti-oxidant delivery system, and a high-power power source, and the melt forming system includes a base, a cooler, a forming head, a forming table, The cooling and anti-oxidant delivery system is composed of a liquid inert gas storage evaporation can, a gas pump, an oxidation protection tube and a connecting pipe, and the resistance double-melt laminated three-dimensional metal member manufacturing forming system is used as a raw material for manufacturing metal parts used by the melt forming system. metallic line.
The resistive double-melt laminated three-dimensional metal member manufacturing forming system according to claim 1, wherein the metal is melted by two heating methods.
The resistive double-melt laminated three-dimensional metal member manufacturing and forming system according to claim 1, wherein an electrode for melting and heating is provided in the forming head or outside the forming head.
The resistive double-melt laminated three-dimensional metal member manufacturing forming system according to claim 1, wherein the metal is directly melted by a thermal effect of a current.
The resistive double-melt laminated three-dimensional metal member manufacturing molding system according to claim 1, wherein an electrode is formed outside the forming head or in the forming head to form an electric circuit with the forming table.
The resistive double-melting laminated three-dimensional metal member manufacturing and forming system according to claim 1 or 3, wherein the forming station is energized.
The resistive double-melt laminated three-dimensional metal member manufacturing and forming system according to claim 1, wherein the wire used is a filament or a rod, and the wire material may be an alloy or a pure metal.
The resistive double-melt laminated three-dimensional metal member manufacturing forming system according to claim 1, wherein the cooling and anti-oxidant delivery system and the cooler of the melt forming system use a low-temperature inert gas as a coolant and oxidation protection Agent.
The resistive double-melt laminated three-dimensional metal member manufacturing forming system according to claim 1, wherein the melt forming system is designed with a cooling and anti-oxidant delivery system that protects the metal material from rapid oxidation due to overheating.
The resistive double-melt laminated three-dimensional metal member manufacturing molding system according to claim 1 or 3, wherein the electrode to be used may be graphite or another electrode material.