Automatic powder scraping device for powder metallurgy pressed part

Abstract

The utility model relates to the technical field of powder metallurgy, in particular to an automatic powder scraping device for powder metallurgy pressed parts, which comprises a device body, the device body is slidably arranged on a workbench through an external mechanical arm, and a cavity is arranged on the top surface of the workbench; the device body comprises a first scraping plate, a second scraping plate and a third scraping plate which are sequentially arranged in parallel, and the first scraping plate, the second scraping plate and the third scraping plate are used for scraping powder on the workbench into the cavity. The bottom surfaces of the first scraping plate, the second scraping plate and the third scraping plate are flush with the workbench; or, the bottom face of the third scraper is flush with the workbench, the distance between the bottom face of the first scraper and the workbench is a, the distance between the second scraper and the workbench is b, and a is larger than b. The device has the effects of reducing labor intensity, improving efficiency and reducing harm to human health.

Description

Technical Field

[0001] The present application relates to the technical field of powder metallurgy, and in particular to an automatic powder scraping device for powder metallurgy compacts. Background Art

[0002] Powder metallurgy friction materials are mainly used in clutches, brakes and brake pads of transportation vehicles such as ships, cars, airplanes, trains and other power equipment. They are mainly composed of powders of five functional components: metal matrix materials, lubricants, friction additives, wear-resistant additives and fillers. One function may require the addition of one or several different powders.

[0003] Traditional powder metallurgy friction materials are made of metal and non-metallic particles of various sizes and components through processes such as powder mixing, pressing powder blanks, and pressure sintering. The uniformity of powder mixing and the control of pressure sintering are relatively easy to achieve, but the uniformity of powder particle size and component distribution in different parts of the pressed powder blanks, as well as the consistency of density and porosity are more difficult to control, which will directly affect the final performance of the friction material.

[0004] With the continuous advancement of modern industrial technology, people have put forward higher and higher requirements for the performance of friction materials. To meet these demands, it is urgent to improve the performance of existing friction materials. Therefore, improving the quality and stability of pressed powder blanks is crucial.

[0005] In the prior art, manual spreading is widely used for powder compaction. The operator transfers the powder to a work surface and then uses a scraper to repeatedly scrape the powder into the mold cavity, ensuring that the powder surface is flush with the work surface. This method is labor-intensive, inefficient, and unhealthy. Utility Model Content

[0006] In order to reduce labor intensity, improve efficiency, and reduce harm to human health, the present application provides an automatic powder scraping device for powder metallurgy pressed parts.

[0007] The present application provides an automatic powder scraping device for powder metallurgy pressed parts, which adopts the following technical solutions:

[0008] An automatic powder scraping device for powder metallurgy pressed parts, comprising a device body, wherein the device body is slidably arranged on a workbench through an external mechanical arm, and a cavity is arranged on the top surface of the workbench;

[0009] The device body comprises a first scraper, a second scraper and a third scraper which are arranged in sequence and in parallel. The first scraper, the second scraper and the third scraper are used to scrape the powder on the workbench into the mold cavity.

[0010] By adopting the above technical solution, when scraping powder, the powder is placed in the mold cavity, the device body is aligned with the position of the mold cavity, and then the robotic arm is started, and the device body is pushed and pulled by the robotic arm, thereby driving the device body to slide, and then the first scraper, the second scraper and the third scraper are used to scrape the powder on the workbench, eliminating the process of manual scraping. The powder in the mold cavity is scraped three times by the first scraper, the second scraper and the third scraper, and the reciprocating motion of the robotic arm can achieve multiple scraping. Manual scraping requires multiple reciprocating pushing, scraping, sorting, and leveling processes, which is inefficient and causes great harm to the human body. The automation of the scraping operation of this application helps to reduce labor intensity, improve work efficiency, improve the working environment, reduce the inhalation of powder by on-site personnel, and thus reduce harm to human health.

[0011] Optionally, the bottom surface of the third scraper is flush with the workbench, the distance between the bottom surface of the first scraper and the workbench is a, the distance between the second scraper and the workbench is b, and a>b.

[0012] Optionally, the bottom ends of the first scraper, the second scraper and the third scraper are all serrated.

[0013] Optionally, a scraping wedge surface is provided on one side of the bottom end of the first scraper, the second scraper and the third scraper.

[0014] By adopting the above technical solution, conventional flat scrapers are prone to pit defects after scraping powder, which require manual filling of pits, multiple round trips of scraping powder, and high requirements on workers' operating skills. The bottom ends of the first scraper, second scraper, and third scraper of the present application are serrated and use scraping wedge surfaces, which can complete three scraping operations in one reciprocating process. In addition, during the three scraping operations, the height of the bottom of the first scraper, second scraper, and third scraper from the workbench decreases from high to low, reducing the agglomeration of mixed powder, achieving smooth scraping, and reducing surface defects of powder in the mold cavity after scraping.

[0015] Optionally, the first scraper, the second scraper and the third scraper are all equipped with high-frequency micro-vibration motors.

[0016] By adopting the above technical solution, a high-frequency micro-vibration motor is installed on each of the first scraper, the second scraper and the third scraper, and high-speed shaking is performed while scraping the powder, which can destroy the agglomeration of the mixed powder and achieve smooth scraping of the powder.

[0017] Optionally, the device body also includes a back panel and a side panel, the back panel is connected to an external robotic arm, the side panels are arranged outside the two ends of the back panel, the first scraper, the second scraper and the third scraper, and the two ends of the back panel, the first scraper, the second scraper and the third scraper are fixedly connected to the side panels.

[0018] By adopting the above technical solution, the first scraper, the second scraper and the third scraper are installed and connected as a whole.

[0019] Optionally, the bottom surfaces of the side panels and the back panel are flush with the workbench, and a powder bin is formed between the back panel, the side panels and the first scraper.

[0020] By adopting this technical solution, powder can be pre-loaded in the powder hopper during scraping. The powder is then automatically distributed into the mold cavity as the device moves, reducing the frequency of manual distribution. A single charge of powder can be used to distribute multiple green sheets, keeping the work surface clean and tidy. This reduces the need for post-scraping cleaning, reduces labor intensity, improves efficiency, and improves the working environment and health of workers. Furthermore, compared to direct powder delivery into the mold cavity via a pipeline, this method offers the advantage of reducing segregation of the mixture, improving the uniformity of the green sheet's chemical composition, and ensuring product quality.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The present application discloses an automated powder scraping device for powder metallurgy compacts, which reduces the frequency of manual feeding. Multiple compacts can be fed with a single powder charge. The device also keeps the work surface clean and tidy, eliminating the need for surface cleanup after each powder scraping. This reduces labor intensity, improves labor efficiency, and improves the operating environment and health of workers. Furthermore, compared with powder delivery through pipelines, the device has the advantage of reducing segregation of the mixture, improving the uniformity of the chemical composition of the compacts, and ensuring product quality.

[0023] 2. This application discloses an automated powder scraping device for powder metallurgy pressed parts, eliminating the manual powder scraping process. Manual powder scraping requires multiple reciprocating pushing, scraping, sorting, and leveling processes, which is inefficient and harmful to the human body. This application achieves the effect of powder scraping and leveling through a single reciprocating motion of a robotic arm, thereby improving labor efficiency while ensuring product quality and reducing the harm of dust to the human body.

[0024] 3. The present application discloses an automated powder scraping device for powder metallurgy pressed parts, which reduces the number of powder scraping times. Conventional flat scrapers are prone to pit defects after scraping, requiring manual filling of pits, multiple round trips for scraping, and requiring high operator skills. The present application's first, second, and third scrapers have serrated bottom ends and employ wedge-shaped scraping surfaces, enabling three powder scraping operations in a single reciprocating process, reducing the agglomeration of mixed powder and achieving smooth scraping.

[0025] 4. The present application discloses an automatic powder scraping device for powder metallurgy pressed parts. High-frequency micro-vibration motors are installed on the first scraper, the second scraper and the third scraper. The high-speed vibration motors can destroy the agglomeration of the mixed powder and achieve smooth scraping while scraping the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a top view of an automatic powder scraping device for powder metallurgy pressed parts in an embodiment of the present application.

[0027] Figure 2 It is a structural schematic diagram used to show the shape of the scraper in the embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the powder silo filling process.

[0029] Figure 4 This is a schematic diagram of the powder pushing process of the robotic arm.

[0030] Figure 5 It is a schematic diagram of the powder scraping process of the robotic arm.

[0031] Explanation of the accompanying reference numerals: 1. Robotic arm; 2. Workbench; 21. Cavity; 3. First scraper; 4. Second scraper; 5. Third scraper; 6. Back plate; 7. Side plate; 8. Scraping wedge surface; 9. Powder silo. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The embodiment of the present application discloses an automatic powder scraping device for powder metallurgy pressed parts. Figure 1-5 The invention discloses an automatic powder scraping device for powder metallurgy compacts, comprising a device body, which is slidably mounted on a workbench 2 via an external robotic arm 1. A cavity 21 is provided on the top surface of the workbench 2. The device body comprises a first scraper 3, a second scraper 4, and a third scraper 5, which are sequentially arranged in parallel. The first scraper 3, the second scraper 4, and the third scraper 5 are used to scrape powder on the workbench 2 into the cavity 21.

[0034] When scraping powder, the powder is placed in the mold cavity 21, the device body is aligned with the position of the mold cavity 21, and then the robotic arm 1 is started, and the device body is pushed and pulled by the robotic arm 1, thereby driving the device body to slide, and then the first scraper 3, the second scraper 4 and the third scraper 5 are scraped on the workbench 2, eliminating the process of manual scraping powder. The powder in the mold cavity 21 is scraped three times by the first scraper 3, the second scraper 4 and the third scraper 5, and the reciprocating movement of the robotic arm 1 can achieve multiple scraping powder. Manual scraping powder requires multiple reciprocating pushing, scraping, sorting, and leveling processes, which is inefficient and causes great harm to the human body. The automation of the scraping operation of the present application helps to reduce labor intensity, improve work efficiency, improve the working environment, reduce the inhalation of powder by on-site personnel, and thus reduce harm to human health.

[0035] Reference Figure 1-5 The device body also includes a back plate 6 and two side plates 7. The back plate 6 is connected to the robotic arm 1. The side plates 7 are arranged outside the two ends of the back plate 6, the first scraper 3, the second scraper 4 and the third scraper 5, and the two ends of the back plate 6, the first scraper 3, the second scraper 4 and the third scraper 5 are fixedly connected to the side plates 7 to realize the overall installation and connection of the first scraper 3, the second scraper 4 and the third scraper 5.

[0036] Reference Figure 1-5 The bottom surfaces of the side panels 7 and the back panel 6 are flush with the workbench 2, and a powder bin 9 is formed between the back panel 6, the side panels 7 and the first scraper 3. When scraping powder, powder can be pre-loaded in the powder bin 9, and the powder is automatically distributed in the cavity 21 as the device body moves, reducing the frequency of manual distribution. One-time powder loading can be used to distribute multiple pieces of green sheets, and the workbench 2 can be kept clean and tidy, reducing the need to tidy up the table after each powder scraping, reducing labor intensity, improving labor efficiency, and improving the workers' operating environment and protecting their health. At the same time, compared with the method of directly feeding powder into the cavity 21 through a pipeline, the advantage is that it reduces the segregation of the mixture, improves the uniformity of the chemical composition of the green sheets, and ensures product quality.

[0037] Because the powder particles are extremely fine and have a large surface potential energy, after the scraper scrapes vertically from the surface of the cavity 21, due to the agglomeration of the powder, pit defects are easily generated on the surface of the powder in the cavity 21, making it difficult to scrape it flat. In addition, the efficiency is low, and each scraping is accidental. It is impossible to judge how many reciprocating movements are needed to scrape the powder flat. After each reciprocating movement of the robot arm 1 to scrape the powder, it is necessary to pause and observe whether the powder surface in the cavity 21 is scraped flat. In addition, the conventional flat scraper is very likely to produce pit defects after scraping the powder, which requires manual filling of the pits, multiple round trips, and high requirements on the worker's operating skills.

[0038] To this end, the following configuration is implemented: the bottom surface of the third scraper 5 is flush with the workbench 2. The bottom surface of the first scraper 3 is at a distance a from the workbench 2, and the distance b from the second scraper 4 is b, where a>b. The bottom ends of the first, second, and third scrapers 3, 4, and 5 are all serrated. A scraping wedge 8 is provided on one side of the bottom end of each of the first, second, and third scrapers 3, 4, and 5. High-frequency micro-vibration motors are also installed on each of the first, second, and third scrapers 3, 4, and 5. These motors are conventional and can be selected and installed based on actual conditions. They are not shown in the accompanying drawings of the present embodiment.

[0039] The sizes of the first, second, and third scrapers 3, 4, and 5, as well as the distance between them, are determined based on the size of the worktable 2, the shape and size of the cavity 21, and other practical operating conditions. The tooth density of the first, second, and third scrapers 3, 4, and 5, as well as their distance from the worktable 2, are determined based on the powder particle size and powder agglomeration. The reciprocating speed of the robotic arm 1 is determined based on the size of the silo and the actual scraping effect.

[0040] The bottom ends of the first, second, and third scrapers 3, 4, and 5 of the present application are serrated and employ a scraping wedge 8, enabling three powder scraping operations in a single reciprocating process. During these three scraping operations, the bottoms of the first, second, and third scrapers 3, 4, and 5 are positioned from high to low relative to the workbench 2, thereby reducing the agglomeration of the mixed powder, achieving smooth scraping, and reducing surface defects in the powder within the mold cavity 21 after scraping. Furthermore, by installing a high-frequency micro-vibration motor on each of the first, second, and third scrapers 3, 4, and 5, the motor vibrates at high speed while scraping, thereby destroying agglomerations of the mixed powder and further achieving smooth scraping.

[0041] The implementation principle of the automatic powder scraping device for powder metallurgy pressed parts in the embodiment of the present application is as follows: Figure 3-5 First, the mixed powder is transferred to the powder bin 9 by manual material collection. Manual material collection and loading can effectively avoid powder segregation. Note that the powder cannot be poured from a high altitude during the loading process.

[0042] Then, the robot arm 1 pushes the powder pushing device to fill the powder in the powder bin 9 into the cavity 21. After the back plate 6 passes through the surface of the cavity 21, the powder particles on the surface of the cavity 21 agglomerate, resulting in local pits. Figure 4 shown.

[0043] Finally, the robot arm 1 pulls back the powder pushing device to charge the mold cavity 21 a second time. After charging, the powder is scraped three times sequentially by the first scraper 3, the second scraper 4, and the third scraper 5. During these three scraping processes, the bottoms of the first scraper 3, the second scraper 4, and the third scraper 5 are positioned at decreasing heights from the workbench 2. The serrated wedge-shaped scrapers minimize powder agglomeration and reduce surface defects in the powder within the mold cavity 21 after scraping.

[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application, such as the number of scrapers, which can be 3 or more, should be covered within the scope of protection of the present application.

Claims

1. An automatic powder scraping device for powder metallurgy pressed parts, characterized by: The device comprises a device body, wherein the device body is slidably arranged on a workbench (2) via an external mechanical arm (1), and a mold cavity (21) is arranged on the top surface of the workbench (2); The device body comprises a first scraper (3), a second scraper (4) and a third scraper (5) which are sequentially arranged in parallel. The first scraper (3), the second scraper (4) and the third scraper (5) are used to scrape powder on the workbench (2) into the mold cavity (21).

2. The automatic powder scraping device for powder metallurgy compacts according to claim 1, characterized in that: The bottom surface of the third scraper (5) is flush with the workbench (2), the distance between the bottom surface of the first scraper (3) and the workbench (2) is a, and the distance between the second scraper (4) and the workbench (2) is b, where a>b.

3. The automatic powder scraping device for powder metallurgy pressed parts according to claim 2, characterized in that: The bottom ends of the first scraper (3), the second scraper (4) and the third scraper (5) are all arranged in a sawtooth shape.

4. The automatic powder scraping device for powder metallurgy pressed parts according to claim 2, characterized in that: A scraping wedge surface (8) is provided on one side of the bottom end of each of the first scraper (3), the second scraper (4) and the third scraper (5).

5. The automatic powder scraping device for powder metallurgy pressed parts according to claim 2, characterized in that: The first scraper (3), the second scraper (4) and the third scraper (5) are all equipped with high-frequency micro-vibration motors.

6. The automatic powder scraping device for powder metallurgy compacts according to any one of claims 1 to 5, characterized in that: The device body further comprises a back plate (6) and a side plate (7), wherein the back plate (6) is externally connected to the mechanical arm (1), and the side plate (7) is arranged outside the two ends of the back plate (6), the first scraper (3), the second scraper (4) and the third scraper (5), and the two ends of the back plate (6), the first scraper (3), the second scraper (4) and the third scraper (5) are fixedly connected to the side plate (7).

7. The automatic powder scraping device for powder metallurgy compacts according to claim 6, characterized in that: The bottom surfaces of the side panels (7) and the back panel (6) are flush with the workbench (2), and a powder bin (9) is formed between the back panel (6), the side panels (7) and the first scraper (3).

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