Hydraulic SLM ultrasonic rolling scraper and laser additive equipment comprising same

Abstract

The utility model discloses a hydraulic SLM ultrasonic rolling scraper and laser additive equipment comprising the hydraulic SLM ultrasonic rolling scraper, and the hydraulic SLM ultrasonic rolling scraper comprises a connecting plate used for being connected with an external moving mechanism; one end of the telescopic rod is connected with the connecting plate; the compression roller assembly comprises a bearing seat, a compression roller body and an ultrasonic vibrator, the bearing seat is connected with the other end of the telescopic rod, the compression roller body is rotationally connected with the bearing seat, and the ultrasonic vibrator is installed at the end of the compression roller body; wherein movement of the connecting plate can drive the compression roller body to roll on the metal powder, the telescopic rod can apply acting force towards the metal powder to the compression roller body, and vibration emitted by the ultrasonic vibrator can be conducted to the metal powder through the compression roller body. According to the metal powder compression roller, when metal powder is compressed through the compression roller body, the ultrasonic vibrators at the ends of the compression roller body emit ultrasonic vibration, the vibration is conducted into the metal powder through the compression roller body, the metal powder is more compact under pressure and vibration, and the quality of formed parts is improved.

Description

Technical Field

[0001] The present application relates to the technical field of laser additive manufacturing, and in particular to a hydraulic SLM ultrasonic rolling scraper and a laser additive device comprising the same. Background Art

[0002] Selective laser melting (SLM) is a major technology approach in laser additive manufacturing. This technology uses a laser beam as the main energy source and scans a specific area of ​​the powder bed based on 3D model slice data to melt the metal powder and solidify it into parts.

[0003] Before the laser melts the metal powder, a layer of metal powder needs to be laid on the surface of the part. The laying of the metal powder needs to be uniform and dense to reduce the risk of cracks or bubbles after the part is formed.

[0004] At present, for the laying of metal powder, a roller is generally used to flatten the metal powder, and then a scraper is used to scrape off the excess powder to ensure that the height of each layer of powder is consistent. However, for some occasions with high requirements for part molding quality, simply using pressure to flatten the metal powder still cannot meet the requirements for the density of the powder, and it is necessary to further improve the density of the metal powder during the powder laying process. Summary of the invention

[0005] The purpose of the present application is to solve at least one of the technical problems existing in the prior art, and to provide a hydraulic SLM ultrasonic rolling scraper and a laser additive equipment including the same, which can make the laid metal powder more dense.

[0006] According to the first embodiment of the present application, a hydraulic SLM ultrasonic rolling scraper is provided, comprising:

[0007] A connecting plate, the connecting plate being used to connect with an external moving mechanism;

[0008] A telescopic rod, one end of which is fixedly connected to the connecting plate;

[0009] A pressure roller assembly, the pressure roller assembly comprising a bearing seat, a pressure roller body and an ultrasonic vibrator, the bearing seat is fixedly connected to the other end of the telescopic rod, the pressure roller body is rotatably connected to the bearing seat, and the ultrasonic vibrator is installed at the end of the pressure roller body;

[0010] The movement of the connecting plate can drive the roller body to roll on the metal powder, the telescopic rod can apply a force toward the metal powder to the roller body, and the ultrasonic vibration emitted by the ultrasonic vibrator can be transmitted to the metal powder through the roller body.

[0011] According to the first aspect embodiment of the present application, further, the hydraulic SLM ultrasonic rolling scraper also includes a guide column, the bearing seat is slidably connected to the guide column, and the guide column is arranged parallel to the telescopic rod.

[0012] According to the first aspect embodiment of the present application, further, the telescopic rod is specifically a hydraulic telescopic rod, and the hydraulic telescopic rod is provided with a hydraulic oil injection port.

[0013] According to the first aspect of the embodiment of the present application, further, there are two telescopic rods, which are symmetrically arranged at both ends of the pressure roller body.

[0014] According to the first aspect of the embodiment of the present application, further, there are two ultrasonic vibrators, which are installed at two ends of the pressing roller body in a one-to-one correspondence.

[0015] According to the first aspect embodiment of the present application, further, the hydraulic SLM ultrasonic rolling scraper also includes a scraper assembly, the scraper assembly includes a scraper mounting member and a scraper, the scraper mounting member is fixedly connected to the connecting plate, and the scraper is connected to the scraper mounting member.

[0016] According to the first aspect embodiment of the present application, further, the scraper assembly also includes a scraper adjustment rod, the scraper is connected to the scraper adjustment rod, the scraper adjustment rod is slidably connected to the scraper mounting member, and the scraper adjustment rod is used to adjust the distance between the scraper and the metal powder.

[0017] According to a second aspect of the present application, a laser additive device is provided, which includes a slide rail and the above-mentioned hydraulic SLM ultrasonic rolling scraper, and the connecting plate is slidably connected to the slide rail.

[0018] According to an embodiment of the second aspect of the present application, further, the laser additive device also includes a driving member, which is connected to the connecting plate and drives the connecting plate to move along the slide rail.

[0019] According to the second aspect embodiment of the present application, further, the laser additive equipment also includes a workbench, the workbench is provided with a powder outlet and a powder drop trough, the powder outlet is used to supply metal powder, and the powder drop trough is used to collect excess metal powder.

[0020] The beneficial effects of the embodiments of the present application include at least: while the present application compresses the metal powder through the pressure roller body, ultrasonic vibrations are emitted through the ultrasonic vibrator at the end of the pressure roller body, and the vibrations are transmitted to the metal powder through the pressure roller body, making the metal powder denser under pressure and vibration, thereby improving the quality of the parts after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief description of the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present application, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0022] Figure 1 It is a three-dimensional diagram of the hydraulic SLM ultrasonic rolling scraper of the first aspect of the present application;

[0023] Figure 2 It is a front view of the hydraulic SLM ultrasonic rolling scraper of the first embodiment of the present application;

[0024] Figure 3 It is a three-dimensional diagram of the laser additive equipment of the second embodiment of the present application.

[0025] Figure markings: 100-connecting plate, 200-telescopic rod, 300-pressure roller assembly, 310-bearing seat, 320-pressure roller body, 330-ultrasonic vibrator, 400-guide column, 500-scraper assembly, 510-scraper mounting, 520-scraper, 530-scraper adjustment rod, 600-slide rail, 700-workbench. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0030] Selective laser melting (SLM) is a major technology approach in laser additive manufacturing. This technology uses a laser beam as the main energy source and scans a specific area of ​​the powder bed based on 3D model slice data to melt the metal powder and solidify it into parts.

[0031] Before the laser melts the metal powder, a layer of metal powder needs to be laid on the surface of the part. The laying of the metal powder needs to be uniform and dense, so as to reduce the risk of cracks or bubbles after the part is formed. At present, for the laying of metal powder, a roller is generally used to flatten the metal powder, and then a scraper is used to scrape off the excess powder to ensure that the height of each layer of powder is consistent. However, for some occasions with high requirements for part molding quality, simply using pressure to flatten the metal powder still cannot meet the requirements for the density of the powder, and it is necessary to further improve the density of the metal powder during the powder laying process.

[0032] In this regard, the present application proposes a hydraulic SLM ultrasonic rolling scraper and a laser additive device including the same. While pressing the metal powder through the pressure roller body 320, ultrasonic vibrations are emitted through the ultrasonic vibrator 330 at the end of the pressure roller body 320. The vibrations are transmitted to the metal powder through the pressure roller body 320, making the metal powder denser under pressure and vibration, thereby improving the quality of the parts after forming.

[0033] Reference Figure 1 The hydraulic SLM ultrasonic rolling scraper in the embodiment of the first aspect of the present application includes a connecting plate 100, a telescopic rod 200 and a pressure roller assembly 300. The connecting plate 100 is used to connect to an external moving mechanism, and the hydraulic SLM ultrasonic rolling scraper is driven to move by the external moving mechanism. The telescopic rod 200 is used to drive the pressure roller assembly 300 to move in a vertical direction, so that the distance between the pressure roller assembly 300 and the metal powder can be adjusted, and pressure can also be applied to the metal powder to complete the rolling. The pressure roller assembly 300 is used to directly contact the metal powder, apply pressure to the metal powder to flatten it, and use the principle of ultrasonic vibration to make the metal powder more compact.

[0034] Specifically, one end of the telescopic rod 200 is fixedly connected to the connecting plate 100. The telescopic rod 200 can be an electric telescopic rod, a pneumatic telescopic rod, a screw mechanism or a hydraulic telescopic rod to complete the telescopic and pressurizing work. In this embodiment, the telescopic rod 200 is specifically a hydraulic telescopic rod, which is provided with a hydraulic oil injection port, which can be connected to an external hydraulic oil supply device to transmit pressure through hydraulic oil.

[0035] Reference Figure 2 The roller assembly 300 includes a bearing seat 310, a roller body 320 and an ultrasonic vibrator 330. The bearing seat 310 is fixedly connected to the other end of the telescopic rod 200, and a bearing is installed inside the bearing seat. The roller body 320 is cylindrical, and is rotatably connected to the bearing seat 310, and the rotational friction between the two is reduced by the bearing. The ultrasonic vibrator 330 is installed at the end of the roller body 320, which can generate ultrasonic vibration and transmit the vibration to the metal powder through the roller body 320.

[0036] The working principle of this embodiment is as follows: the connecting plate 100 moves under the drive of the external moving mechanism, thereby driving the roller body 320 to roll on the metal powder. The telescopic rod 200 can drive the roller body 320 to approach the metal powder and apply a force toward the metal powder to the roller body 320, thereby completing the rolling work. The ultrasonic vibration emitted by the ultrasonic vibrator 330 can be transmitted to the metal powder through the roller body 320, thereby making the metal powder more dense under vibration and reducing the gap between the powders. By combining rolling and ultrasonic vibration, the density of the metal powder after rolling can be further improved, thereby improving the quality of the final part during molding.

[0037] Furthermore, the hydraulic SLM ultrasonic rolling scraper further comprises a guide post 400. The guide post 400 is arranged parallel to the telescopic rod 200, and the bearing seat 310 is slidably connected to the guide post 400, so that the sliding direction of the bearing seat 310 is limited by the guide post 400, reducing the probability of its deviation during movement.

[0038] In this embodiment, there are two guide posts 400 and they are symmetrically arranged on both sides of the telescopic rod 200. It is easy to understand that there may be multiple guide posts 400, and the multiple guide posts 400 are distributed in a circular array around the telescopic rod 200.

[0039] Furthermore, there are two telescopic rods 200 and they are symmetrically arranged at both ends of the roller body 320. The two telescopic rods 200 jointly apply force to the roller body 320, which can make the roller body 320 more evenly stressed and reduce the occurrence of uneven rolling due to uneven force.

[0040] Furthermore, there are two ultrasonic vibrators 330, which are respectively mounted on both ends of the roller body 320 in a one-to-one correspondence, so that the vibration intensity is improved through the joint vibration of the two ultrasonic vibrators 330. Moreover, compared with the ultrasonic vibration of a single ultrasonic vibrator 330 at a single end of the roller body 320, the simultaneous vibration of both ends can make the vibration more evenly spread in the roller body 320, thereby more evenly applying vibration to the metal powder.

[0041] Furthermore, the hydraulic SLM ultrasonic rolling scraper further includes a scraper assembly 500, and the scraper assembly 500 includes a scraper mounting member 510 and a scraper 520. The scraper mounting member 510 is fixedly connected to the connecting plate 100, and the scraper 520 is connected to the scraper mounting member 510. After the pressure roller assembly 300 compacts the metal powder, the scraper 520 scrapes the surface of the metal powder, thereby ensuring that the thickness of the metal powder meets the slicing thickness requirement.

[0042] Furthermore, the scraper assembly 500 further includes a scraper adjustment rod 530. The scraper 520 is connected to the scraper adjustment rod 530, and the scraper adjustment rod 530 is slidably connected to the scraper mounting member 510. By sliding the scraper adjustment rod 530, the distance between the scraper 520 and the metal powder can be changed, thereby changing the thickness of the scraped metal powder.

[0043] The scraper adjustment rod 530 can also be replaced by a screw rod. The scraper mounting member 510 is provided with a threaded hole, the screw rod is threadedly connected to the threaded hole, and the scraper 520 is rotatably connected to the end of the screw rod. The scraper 520 can be driven to rise and fall by screwing the screw rod, thereby adjusting the height of the scraper 520. Moreover, the screw rod itself has a self-locking function, which can prevent the scraper 520 from moving at will.

[0044] Reference Figure 3 A laser additive device in the second aspect embodiment of the present application includes a slide rail 600 and the above-mentioned hydraulic SLM ultrasonic rolling scraper, and a connecting plate 100 is slidably connected to the slide rail 600, so that the hydraulic SLM ultrasonic rolling scraper can slide along the slide rail 600.

[0045] Furthermore, the laser additive device further includes a driving member, which is connected to the connecting plate 100 and drives the connecting plate 100 to move along the slide rail 600. The driving member can be a driving mechanism such as a motor, an electric slide rail, an electric telescopic rod, a pneumatic telescopic rod, and a hydraulic telescopic rod. It is easy to understand that other driving mechanisms that can achieve the same driving effect can also be used, which will not be described in detail here.

[0046] Furthermore, the laser additive equipment also includes a workbench 700, which is provided with a powder outlet and a powder drop trough. The powder outlet is used to supply metal powder, and the powder drop trough is used to collect excess metal powder. In actual work, the powder outlet pushes out the metal powder through the internal lifting mechanism, and then the hydraulic SLM ultrasonic rolling scraper scrapes the metal powder to the surface of the part. After being compacted by the pressure roller assembly 300 and scraped by the scraper assembly 500, the laser is irradiated by the laser to complete the melting of the metal powder. After the metal powder solidifies, it forms the current slice shape of the part. Finally, the hydraulic SLM ultrasonic rolling scraper continues to move, scraping the excess metal powder into the powder drop trough to complete the collection and recovery of the metal powder.

[0047] Below is the workflow of this laser additive equipment:

[0048] S100. The lifting mechanism inside the powder outlet is lifted to push the metal powder out of the powder outlet;

[0049] S200. The driving member drives the hydraulic SLM ultrasonic rolling scraper to move forward along the slide rail 600 and scrapes the metal powder at the powder outlet to the surface of the part;

[0050] S300. The telescopic rod 200 drives the roller body 320 to press down, and the ultrasonic vibrator 330 is started;

[0051] S400. The roller body 320 contacts the metal powder and applies vertical pressure thereto, and at the same time, the ultrasonic vibration generated by the ultrasonic vibrator 330 is transmitted to the metal powder through the roller body 320, so that the metal powder is compressed and vibrated at the same time;

[0052] S500. The metal powder becomes dense under pressure and vibration, and the scraper 520 further scrapes the top layer of the metal powder so that the thickness of the metal powder meets the slicing requirements;

[0053] S600. Turn on the laser, heat the metal powder with the laser and melt it, and obtain the slice shape of the layer of the part after the metal powder solidifies;

[0054] S700. The hydraulic SLM ultrasonic rolling scraper continues to move, scraping the excess metal powder into the powder drop trough for recycling. The metal powder in the powder drop trough can flow back to the powder outlet to rejoin the production cycle;

[0055] S800. The hydraulic SLM ultrasonic rolling scraper returns to the initial position;

[0056] S900. The workbench drives the part to rise and fall, and the above steps S100 to S800 are repeated to complete the manufacturing of each layer of slices of the part.

[0057] The above is a specific description of the preferred implementation methods of the present application, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application, and these equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A hydraulic SLM ultrasonic rolling scraper, characterized in that: include: A connecting plate, the connecting plate being used to connect with an external moving mechanism; A telescopic rod, one end of which is fixedly connected to the connecting plate; A pressure roller assembly, the pressure roller assembly comprising a bearing seat, a pressure roller body and an ultrasonic vibrator, the bearing seat is fixedly connected to the other end of the telescopic rod, the pressure roller body is rotatably connected to the bearing seat, and the ultrasonic vibrator is installed at the end of the pressure roller body; The movement of the connecting plate can drive the roller body to roll on the metal powder, the telescopic rod can apply a force toward the metal powder to the roller body, and the ultrasonic vibration emitted by the ultrasonic vibrator can be transmitted to the metal powder through the roller body.

2. The hydraulic SLM ultrasonic rolling scraper according to claim 1, characterized in that: The hydraulic SLM ultrasonic rolling scraper also includes a guide column, the bearing seat is slidably connected to the guide column, and the guide column is arranged parallel to the telescopic rod.

3. The hydraulic SLM ultrasonic rolling scraper according to claim 1, characterized in that: The telescopic rod is specifically a hydraulic telescopic rod, and the hydraulic telescopic rod is provided with a hydraulic oil injection port.

4. The hydraulic SLM ultrasonic rolling scraper according to claim 1, characterized in that: There are two telescopic rods, which are symmetrically arranged at two ends of the pressing roller body.

5. The hydraulic SLM ultrasonic rolling scraper according to claim 1, characterized in that: There are two ultrasonic vibrators, which are respectively installed at two ends of the pressing roller body in a one-to-one correspondence.

6. The hydraulic SLM ultrasonic rolling scraper according to claim 1, characterized in that: The hydraulic SLM ultrasonic rolling scraper also includes a scraper assembly, and the scraper assembly includes a scraper mounting member and a scraper. The scraper mounting member is fixedly connected to the connecting plate, and the scraper is connected to the scraper mounting member.

7. The hydraulic SLM ultrasonic rolling scraper according to claim 6, characterized in that: The scraper assembly also includes a scraper adjustment rod, the scraper is connected to the scraper adjustment rod, the scraper adjustment rod is slidably connected to the scraper mounting member, and the scraper adjustment rod is used to adjust the distance between the scraper and the metal powder.

8. A laser additive device, characterized in that: It comprises a slide rail and the hydraulic SLM ultrasonic rolling scraper as described in any one of claims 1 to 7, wherein the connecting plate is slidably connected to the slide rail.

9. The laser additive manufacturing device according to claim 8, characterized in that: The laser additive manufacturing device further includes a driving member, which is connected to the connecting plate and drives the connecting plate to move along the slide rail.

10. The laser additive manufacturing device according to claim 8, characterized in that: The laser additive equipment also includes a workbench, which is provided with a powder outlet and a powder drop trough. The powder outlet is used to supply metal powder, and the powder drop trough is used to collect excess metal powder.

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