CN2880469Y - Powder material fast shaping system - Google Patents

Abstract

The utility model discloses a powder material rapid prototyping system, which comprises a processing space and a laser scanning device. The processing space consists of left and right powder falling devices, a protective mirror, a roller or a scraper, a working cavity, a working cylinder and a working cylinder. The system consists of at least two laser scanning devices and the same number of protective mirrors. The laser scanning devices are equidistantly distributed. seal. The utility model is a high-tech device integrating CAD technology, CNC technology, laser processing, and material science and technology. The rapid prototyping device overcomes the shortcomings of current powder material rapid prototyping devices in terms of quality, forming efficiency, cost, and environmental protection, and has two key innovations: multi-laser scanning, which realizes rapid prototyping of powder materials in a vacuum environment. The system can improve the forming quality and efficiency of the powder material rapid prototyping device.

Description

A rapid prototyping system for powder materials

technical field

The utility model belongs to the field of rapid manufacturing, in particular to a powder material rapid prototyping system.

Background technique

At present, the materials suitable for rapid prototyping of powder materials include polymers, ceramics, metals and composite materials. However, the current devices using powder material rapid prototyping technology generally use a single laser single scanning device, see "a rapid prototyping system for direct manufacturing of metal parts" (application number: CN200410061364.7 publication date: 2005.06.29). Although they are capable of complex forming processes, their forming efficiency is relatively low. In addition, the existing rapid prototyping devices for powder materials generally pass protective gas, such as nitrogen, argon, etc., during the forming process. The use of protective gas has the following disadvantages: the first is to increase the cost of rapid prototyping of powder materials; the second is that the quality of the formed parts is affected by the protection gas remaining in the formed parts; the third is that the protection gas may be affected by leakage. Personal safety; the fourth is that protective gases (argon, helium) are discharged into the atmosphere, causing environmental pollution.

Contents of the invention

Aiming at the shortcomings of existing rapid prototyping devices, the utility model provides a powder material rapid prototyping system, which can improve the efficiency and quality of rapid prototyping parts.

A powder material rapid prototyping system provided by the utility model includes a processing space and a laser scanning device, wherein the processing space consists of left and right powder falling devices, protective mirrors, rollers or scrapers, working chambers, working cylinders and It is composed of working cylinder and piston; it is characterized in that: the system includes at least two laser scanning devices, and the same number of protective mirrors, each laser scanning device is equidistantly distributed, and the working chamber is a vacuum working chamber, which is connected with other laser scanning devices in the processing space. The joints of the components remain hermetically sealed.

The system of the utility model adopts multiple laser scanning heads, which can improve the efficiency of rapid forming parts. For the same part, the time required to complete it with a multi-scanning device is shorter than that of a single scanning device. The system of the utility model can make up for the deficiencies in cost, parts quality, personal safety and environmental protection caused by the current powder material rapid prototyping device passing through the protective gas. The use of vacuum forming environment has the following advantages: First, it can isolate the influence of external atmosphere on the forming of powder materials, and can also eliminate the influence of the atmosphere generated by powder materials in the laser forming process, which is conducive to the rapid forming of powder materials. control; second, the use of vacuum forming environment is beneficial to eliminate spheroidization, increase the wettability of materials, and improve the interaction between laser and materials, which is conducive to the rapid prototyping of powder materials; third, it is beneficial to increase the Fluidity, which is conducive to dehydration and degassing during the interaction between laser and material.

In summary, the utility model system is suitable for rapid manufacturing of metal parts, ceramic parts, polymer parts and composite material parts.

Description of drawings

Fig. 1 is the structural representation of the utility model system;

Fig. 2 is A-A sectional view of Fig. 1;

FIG. 3 is a schematic layout diagram of a multi-laser scanning head device.

Detailed ways

Below in conjunction with accompanying drawing and example the utility model is described in further detail.

As shown in Figure 1, the utility model system consists of a processing space and two or more laser scanning devices. Wherein, the processing space 7 is composed of left and right powder falling devices 1, 4, a protective mirror group 8, a roller (or scraper) 14, a working chamber 9, a working cylinder 11 and a working cylinder piston 12.

The laser scanning device consists of a scanning head and a laser generator connected to it. As shown in FIG. 2 , the scanning heads 2 , 3 , 5 , and 6 are equidistantly distributed above the working cylinder 11 . The scanning head achieves focusing, and the laser scanning device realizes selective laser rapid prototyping of powder materials.

In order to make them compact, the installation size of the scanning head and the size of the scanning field are arranged equidistantly according to the partition scanning field. As shown in schematic diagram 3, the scanning field 15 is a square, which is divided into four equally divided areas A, B, C, and D, and each area is scanned by corresponding scanning heads 2, 3, 5, and 6 respectively. The protective mirror group 8 is composed of four protective mirrors, which are located directly below the laser beam exit points of the scanning heads 2, 3, 5, and 6, and are installed equidistantly to realize partition scanning. The laser beam emitted by the laser scanning head 2 scans its corresponding equal partition A through the protective mirror below it. Similarly, the laser scanning heads 3, 5, and 6 are responsible for scanning the equal partitions B, C, and D. The single laser scanning device of the multi-laser multi-scanning device scans under computer control, and its two or more laser scanning devices can realize synchronous scanning under computer control. When forming a part, each laser scanning device in the multi-laser scanning device simultaneously scans different parts of the CAD three-dimensional solid slice layer of the part under computer control. When forming multiple parts, each laser scanning device in the multi-laser scanning device can scan the slice layers of different parts under the control of the computer.

The left and right powder falling devices 1 and 4 are internally equipped with powder materials, and their powder outlets communicate with the working cavity 9 . The roller 14 is located inside the working cavity 9, and the ordinary motor controlled by the frequency converter controls the roller 14 to move bidirectionally along the horizontal direction for powder spreading. From the left powder falling device 1 to the right powder falling device 4 or from the right powder falling device 4 to the left powder falling device 1, one layer of powder is spread every time; the laser scanning device is located between the left and right powder falling devices 10 and 11. The top of the cavity 9 is provided with a protective mirror group 8 . The number of protective mirrors in the protective mirror group 8 is the same as the number of laser scanning heads in the laser scanning device, and they are respectively located directly below the corresponding laser scanning heads.

The bottom of the working cavity 9 is provided with a working cylinder body 11, and a working cylinder piston 12 is arranged in the working cylinder body 11, and the working cylinder piston 12 moves up and down in the vertical direction controlled by a separate stepping motor. The working cavity 9 is externally connected with a vacuum pump, and the connections between the working cavity 9 and other components in the processing space are kept airtight to form a vacuum working cavity. The laser beam emitted by the laser scanning device acts on the powder to be processed on the upper surface of the working cylinder piston 12 through the protective mirror group 8 . Every time one layer is processed, the working cylinder piston 12 drops the distance of one layer thickness. In the figure, 10 represents the processed part of the workpiece; 13 represents the redundant powder material.

The multi-laser in this device can be any one of carbon dioxide laser, YAG laser, fiber laser, and ultraviolet laser. Such as carbon dioxide lasers for rapid prototyping of polymers, ceramics, and sand powder materials, YAG lasers or fiber lasers for rapid prototyping of metal powder materials.

The difference between the utility model system and the existing powder material rapid prototyping device lies in two key parts, one is to change the current single-laser single-scanning device into a multi-laser multi-scanning head device, and the other is to change the current protective gas environment The working cavity is a vacuum environment working cavity.

Claims (1)

1, a kind of powder materials rapid forming system comprises processing space and laser scanning device, and wherein, processing space is made of left and right powder discharging device, protective glass, roller or scraper plate, working cavity, working cylinder and working cylinder piston; It is characterized in that: this system comprises two laser scanning devices at least, and the protective glass of equal number, and each laser scanning device is equally spaced, and described working cavity is the vacuum work chamber, keeps hermetic seal with the junction of other parts in the processing space.

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