RU89997U1 - DEVICE FOR PREPARATION OF METAL POWDERS FOR SINTERING OF PARTS BY TECHNOLOGY OF LAYERED SYNTHESIS - Google Patents

Abstract

A device for preparing metal powders for sintering parts by the technology of layer-by-layer synthesis, intended for installation on a stand for layer-by-layer synthesis and containing a device for storing powder, made in the form of a hopper for storing working powder, and mounted on the installation plate and a metering mechanism of the slide type, characterized in that the powder storage device is equipped with an additional hopper for storing the technological powder, while both hoppers are mounted on the installation plate, and the dosing mechanism The slide gate type is made in the form of a positional rotary disk with a hole provided with a positional drive, and the through hole is made with a volume equal to the volume of a portion of powder, a positional gate device with a hole equipped with a pneumatic drive and designed to supply a portion of the selected brand of sintering powder to the sintering zone, positional a slider equipped with a pneumatic drive designed to pour out powder in the sintering zone, while the dispensing type dosing mechanism is installed under the installation plate and so that upon rotation of the rotary disc positional formed therein opening occupies a position beneath one of the bins.

Description

Technical field

The utility model relates to the field of mechanical engineering, namely to the field of powder metallurgy, in particular, to the technology of laser layer-by-layer synthesis of complex parts from fine metal powder and can be used in various sectors of machine-building industry.

State of the art

Several brands of laser synthesis machines are known having various devices for storing and dispensing powder material. For example, a machine "Concept M2 (Germany) (source of information http://www.mcp.by/equipment?id=49, 2009) - equipped with a work table and a table-top vertical cylinder designed to store powder of the same brand, and the magnitude of the vertical stroke upward piston provides the necessary portion of powder to be horizontally transported by mechanical knives (blades) into the working area for leveling and for sintering one layer.

Pnenix machines, for example, the Pnenix - 250 machine (according to www1.pomori.ru, 2009), consisting of a laser-optical system and a working chamber. The working chamber is made with a vertically movable working table and a table-top vertical cylinder intended for storing powder of the same brand, and the magnitude of the vertical upward stroke of the piston provides the necessary portion of the powder - a dosed feeding mechanism. In addition, the machine is equipped with a mechanism for leveling a portion of the powder in the form of a cylinder. Also, the working chamber is equipped with vacuum systems, purification and protection of the gaseous medium, temperature control systems for the sintered layer, part cooling, a control system and software.

The closest to the technical solution is the Trumpf machine (source - World Wide Web http://www.ru.trumpf.com, 2009) equipped with a hopper for storing powder and a slide mechanism for dispensing a portion of the powder and delivering it to the layer alignment zone .

The disadvantage of all the mentioned devices for preparing powders for sintering is the use of a single brand of powder when performing the entire technological cycle of sintering of a part.

It is known that for sintering any parts it is necessary, first of all, to sinter a temporary technological support, on which the main part is subsequently sintered. For parts made of expensive alloys, including heat-resistant and refractory, sintering of the support, removed later, occurs from the powders of these alloys, which increases the material and energy costs of manufacturing complex parts (for example, disk-shaped, as well as small-sized, etc.). Removing the backup using the technology of machining (including cutting) occurs after cooling and cleaning of the manufactured part.

In addition, if it is necessary to sinter the part on the above machines using several different grades of powder (after stopping the sintering process with cooling the chamber), the following operations should be performed:

1. Cleaning either the hopper or cylinder of the powder preparation mechanism from the used powder.

2. Pouring powder of a new brand into the hopper or into the cylinder with the rod lowered for the subsequent formation of a powder layer.

Thus, the use of the above machines increases the production cycle of the part, provided that the part is made of various powders, while the complexity of manufacturing the part and its cost increases.

Utility Model Essence

The objective of the utility model is the creation of such a design of a device for preparing metal powders for sintering parts by layer-by-layer synthesis technology, which would provide simultaneous multiple storage and batch delivery of metal powders of various grades for sintering a support made of relatively cheap alloys, thereby reducing the cost of sintering parts made of metal powder using layer-by-layer sintering technology.

This object is achieved in that the device for preparing metal powders for sintering by the technology of layer-by-layer synthesis contains a device for storing powder, made in the form of a hopper for storing working powder, and mounted on the installation plate, as well as a slide type metering mechanism. The powder storage device is equipped with an additional hopper for storing the technological powder, while both hoppers are mounted on the installation plate. The slide type dispensing mechanism is made in the form of a positional rotary disk with a hole provided with a positional drive. Moreover, the through hole is made with a volume equal to the volume of the portion of the powder. The slide type dispensing mechanism is also equipped with a positional slide device with an aperture equipped with a pneumatic actuator and designed to supply a portion of the selected brand of sintering powder to the sintering zone. In addition, the dispenser type dispensing mechanism is equipped with a positional slider with a pneumatic drive designed to pour out powder in the sintering zone. The slide type dispensing mechanism is installed under the installation plate, so that when turning the positional rotary disk, the hole made in it occupies a position under one of the hoppers.

Thus, the device for the preparation of metal powders for sintering parts by the technology of layer-by-layer synthesis provides simultaneous multi-unit storage and dosed dispensing of various grades of metal working powders and technical powders for sintering supports made from relatively cheap alloys.

The list of figures in the drawings.

A useful model of a device for preparing metal powders for sintering by layer-by-layer synthesis technology is illustrated by drawings, in which:

Figure 1. - shows a device for preparing metal powders for sintering parts by layer-by-layer synthesis technology in the initial position, a top view of the stand plate;

Figure 2. - shows a cross-section BB of the powder preparation device;

Figure 3. - shows the cross section CC of the powder preparation device.

Utility Model Implementation

The stand for the manufacture of parts by the technology of layer-by-layer synthesis consists of a frame on which the mechanism of the device for preparing powders with hoppers is mounted, the mechanism for the dosed supply of powder of the slide type, the mechanism for leveling the powder layer. In addition, the device is equipped with a fiber optic laser model LS-03, a mechanism for vertical movement of the laser optical head, consisting of a laser optical head rigidly fixed (with the exception of a possible shift) on the linear servo rod, the linear servo rod moves along a guide rigidly fixed (with the exception of the possibility shear) fasteners on the bracket of the experimental stand. The mechanism of vertical movement of the optical head is designed to create different diameters of the light spot of the laser beam, without changing the focal length, both in automatic and manual mode. And also the device is equipped with a control cabinet, a working chamber (with systems of vacuum, pressurization of the gas, cleaning, cooling the chamber, monitoring the actual temperature of the sintered powder), a working table 8 with the possibility of its vertical movement using a high-precision step-by-step screw drive with CNC, control panel with the modes of both manual and automatic control of the stand with software, a protective casing made of a metal sheet with minimal reflectivity.

A device for preparing metal powders for sintering (Figs. 1, 2), is made in the form of a plate 3 with two hoppers 2 mounted on it containing working and technological brands of powders 4, a positioning rotary disk 5, a positioning slide device 6, a positioning slide 7 of corresponding drives 10, 13, 14.

The steel plate 3 is rigidly fixedly mounted on the frame of the stand 1.

The bins 2 are made of metal sheets.

The sector of the rotary disk 5 (Fig. 1) is made of a steel plate with a through hole 9, (Fig. 3) designed to select and form a portion of the powder of the required grade, the volume of this hole determining the dosage portion of the powder. The horizontal movement of the sector of the rotary disk 5 provides a positional drive 10 with CNC connected to the plate 3 by means of a sleeve 11.

Positional gate device (gate) 6 is mounted under the sector of the rotary disk 5, (figure 2). The gate 6 is made in the form of a metal plate with a through hole 12 (Fig. 3), and is designed to feed a portion of the selected grade of powder 4 into the leveling zone of its layer (desktop 8). The gate 6 is driven by a pneumatic actuator 13, rigidly mounted on the plate 3.

The position slider 7 is mounted under the sector of the rotary disk 5. The slider 7 is made in the form of a metal plate and is designed to pour powder onto the work table 8. The slider 7 is driven by a pneumatic actuator 14 (Fig. 1), which is rigidly fixed with screws on the plate 3.

The rod 15 of the pneumatic actuator 13, as well as the rod 16 of the pneumatic actuator 14 are rigidly connected by screws to the plates of the gate 5 and the slide 7, respectively (Fig. 1).

Plane-parallel movement of the gate 6 and the slider 7 occurs along the guides 17 made in the form of parallel plates rigidly connected to the stand 1. (Fig 3).

The operation of the device for preparing metal powders for sintering parts by the technology of layer-by-layer synthesis is carried out as follows:

In the initial position (Fig. 1), different grades of powder are poured into the hoppers 2, the through hole 9 of the sector of the rotary disk 5 is in the middle position between the hoppers 2, the slide 6 and the slider 7 are in the extreme left position (Figs. 1, 2).

In accordance with the software, by turning on the drive 10 of the sector of the rotary disk 5, the through hole 9 is transferred to the hopper 2 containing the technological powder. In this position, the powder of the selected brand is poured into the through hole 9 (formation of a portion of the powder). The drive 10 is turned on, the sector of the rotary disk 5 transfers the through hole 9 with a portion of the powder to its original position (Fig. 1) to fill a portion of the powder into the through hole 12 of the gate 6.

By turning on the drives 13, 14 of the gate 6 and the slider 7, a portion of the powder is transferred to the area of the working table 8, when the slider 7 is returned to its original position (without returning the gate 6), a portion of the powder is poured into the area of the working table 8 for subsequent formation (including alignment ) of its layer. After which, the gate 6 returns to its original position. (figure 1)

A portion of the powder for the support is sintered by a laser beam from the substrate of the part in accordance with the software of the sintering modes of the support.

After the sintering of the support in accordance with the software, the desktop is lowered to the height of one layer, the sector of the rotary disk 5 transfers the through hole 9 to the next hopper 2, where a portion of the powder is formed from the working (heat-resistant, for example) grade of the alloy of the part in accordance with the accepted technology.

By turning on the gate 6 and the slider 7, a portion of the powder of the working brand is transferred to the area of the working table 8 to form a layer of powder and its subsequent sintering in accordance with the software of the sintering modes.

After sintering this layer of powder of the main brand, the cycles of formation of other layers of powder of the main brand are repeated, with the lowering of the working table 8, until the final manufacture of the entire part. Then the finished part is cooled, cleaned and removed from the installation.

Thus, using the proposed utility model, at the beginning a backup is made of metal powders with a reduced sintering temperature, and in the future, parts are sintered from heat-resistant and refractory alloys. When sintering complex parts (such as disk-shaped, flat, small-sized, etc.) from expensive powders of heat-resistant and refractory alloys, the use of the proposed utility model for the preparation of metal powders reduces the cost of sintering of complex parts by providing the possibility of simultaneous storage and dosing of several different grades of powders.

Claims (1)

A device for preparing metal powders for sintering parts by the technology of layer-by-layer synthesis, intended for installation on a stand for layer-by-layer synthesis and containing a device for storing powder, made in the form of a hopper for storing working powder, and mounted on the installation plate and a metering mechanism of the slide type, characterized in that the powder storage device is equipped with an additional hopper for storing the technological powder, while both hoppers are mounted on the installation plate, and the dosing mechanism The slide gate type is made in the form of a positional rotary disk with a hole provided with a positional drive, and the through hole is made with a volume equal to the volume of a portion of powder, a positional gate device with a hole equipped with a pneumatic drive and designed to supply a portion of the selected brand of sintering powder to the sintering zone, positional a slider equipped with a pneumatic drive designed to pour out powder in the sintering zone, while the dispensing type dosing mechanism is installed under the installation plate and so that upon rotation of the rotary disc positional formed therein opening takes a position under one of the bins.