Air suction type mold filling method and test device

Abstract

The invention relates to an air suction type mold filling method and a test device. The test device comprises a control module, a mold filling module and an air suction module. The control module is composed of a programmable controller, a frequency converter, a touch screen, a control cabinet, a position sensor, a servo motor and a lead screw sliding block mechanism and used for accurately controlling linear motion of the feeding boot. The mold filling module comprises a feeding boot, a test platform and a multi-suction-hole mold. The upper end face of the multi-suction-hole mold coincides with the lower end face of the feeding boot and the upper table top of the test platform in the horizontal direction. The air suction module comprises an air compressor, a rotor flow meter, a powder sedimentation pipeline and a powder filter. The air suction module is connected with air suction holes in the multi-air-suction-hole mold. The air suction module can suck and remove closed air mass in the mold in the mold filling process and completely eradicate escape airflow, the influence of air on the mold filling process is eliminated, and then the powder mold filling efficiency is improved. The multi-air-suction-hole mold is matched with the air suction module, so that the influence of the closed air mass on the powder mold filling characteristic can be further explored.

Description

Technical Field

[0001] The present invention relates to the technical field of powder mold filling, and is particularly suitable for evaluating the influence of air on a mold filling process, and specifically relates to an air suction mold filling method and a test device. Background Art

[0002] As a special method of near-net-shape forming, powder forming technology has been rapidly developed in the fields of powder metallurgy, aerospace, ceramics, food and medicine, etc., because its products have the advantages of strong shape adaptability, less machining and low cost. In the powder forming process, powder filling is an indispensable link in the production process. The powder filling effect and filling efficiency are the key factors in the filling process. They not only affect the subsequent process links, but also affect the final quality and performance of the powder products.

[0003] The existing filling methods mainly include gravity filling and suction filling. During gravity filling, the air pressure in the mold cavity increases continuously as the powder filling progresses. In suction filling, the rapid downward movement of the punch will inhale the surrounding air while inhaling the particles. The inhaled air will cause the air pressure in the mold cavity to rise in the later stage of filling, which will seriously hinder the powder filling process. In the above filling methods, there will always be a certain amount of air in the mold cavity during the filling process, which can only be discharged through the gap between the particles and the gap between the feed shoe and the mold cavity. This hinders the further filling of the powder, thereby affecting the powder filling efficiency. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide an air suction filling method and a test device.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] In the first aspect, an air suction type mold filling test device includes a control module, a mold filling module and an air suction module. The control module includes a programmable controller, a frequency converter, a touch screen, a control cabinet, a position sensor, a servo motor and a screw slider mechanism. Control information is transmitted to the programmable controller and the frequency converter through the touch screen in the control cabinet, and then the servo motor is controlled to drive the screw slider to move. Three position sensors are arranged on the bracket for installing the screw slider mechanism.

[0007] The filling module includes a feed shoe, a test platform and a mold with multiple air suction holes. The rear side of the feed shoe is fixed on the screw slider mechanism and can move with the screw slider. The bottom surface is close to and suspended as a whole on the upper surface of the test platform. The feed shoe is a flat cavity structure that runs through the top and bottom, and its top is designed to be funnel-shaped; the test platform is provided with a through hole in the middle of the screw slider mechanism; the mold with multiple air suction holes is flat, and one end opening is detachably connected to the through hole of the test platform; four air suction ports are respectively provided in the middle position of the bottom and the right side of the mold with multiple air suction holes.

[0008] The air suction module includes an air compressor, a rotor flowmeter, a powder sedimentation pipeline and a powder filter. The powder filter is connected to a suction hole of a multi-suction hole mold. The two ends of the powder sedimentation pipeline are respectively connected to the powder filter and the flowmeter, and the flowmeter is connected to the air compressor.

[0009] The air suction filling method proposed in the present invention adds an air suction device to the filling system to remove the air in the mold cavity during the filling process and prevent the occurrence of escaping airflow, thereby achieving rapid exhaust of the filling process to eliminate the influence of air on the filling process.

[0010] In the second aspect, the air suction mold filling test device and the multi-suction hole mold cavity proposed in the present invention can be used to study the powder filling properties and gas flow properties. The specific steps are as follows:

[0011] Gravity filling is performed, that is, the suction module does not act on the filling module. The powder in the feed shoe flows into the multi-suction hole mold only under the action of gravity. As the powder flows in and the feed shoe seals the multi-suction hole mold, the discharge of the enclosed air mass in the mold is blocked, and the pressure gradually increases, which hinders further filling.

[0012] Changing the position of the suction module connected to the multi-suction hole mold can make the enclosed air mass continuously discharged during the entire stage of mold filling, and can also obtain the flow behavior of the enclosed air mass in the mold during mold filling, thereby revealing the qualitative and quantitative relationship between the suction hole position and powder filling;

[0013] By adjusting the rotor flowmeter to control the suction flow, the influence of different suction flow rates on the mold filling process can be obtained, and then the qualitative and quantitative relationship between the suction flow rate and the powder mold filling can be revealed;

[0014] The air suction mold filling method and test device proposed by the present invention have the following beneficial effects:

[0015] An air suction device is added to the mold filling system to remove the air in the mold cavity during the mold filling process and prevent the occurrence of escaped airflow, thereby achieving rapid exhaust during the mold filling process to eliminate the influence of air on the mold filling process. The position and flow rate of the air suction device relative to the mold with multiple air suction holes can be adjusted, and the flow behavior of the air in the mold during mold filling and the powder filling characteristics can be obtained, providing support for further exploration of the influence of air on the mold filling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] Figure 1 It is a structural schematic diagram of the air suction type mold filling test device of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the mold filling module and its fastening device in the present invention;

[0019] Figure 3 It is a structural schematic diagram of the air intake module in the present invention;

[0020] Figure 4 It is a schematic diagram of the flow of air when performing non-suction mold filling in the present invention;

[0021] Figure 5 It is a schematic diagram of the flow of air during suction filling of the present invention.

[0022] In the figure, 1. control cabinet; 2. frequency converter; 3. programmable controller; 4. touch screen; 5. servo motor; 6. screw slider mechanism; 7. position sensor; 8. feed shoe; 9. test platform; 10. multi-suction hole mold cavity; 11. powder filter; 12. powder sedimentation pipeline; 13. rotor flowmeter; 14. air compressor. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] like Figure 1 The air suction type mold filling test device shown includes a control module, a mold filling module and an air suction module.

[0026] like Figure 1The control module shown includes a control cabinet 1, a frequency converter 2, a programmable controller 3, a touch screen 4, a servo motor 5, a lead screw slider mechanism 6, and a position sensor 7;

[0027] The frequency converter, programmable controller and touch screen are installed in the control cabinet, and the servo motor and lead screw slider mechanism are installed on the test platform;

[0028] The touch screen transmits control information to the programmable controller and the frequency converter to control the servo motor to drive the lead screw slider to move;

[0029] The three position sensors are installed on the bracket of the screw slider mechanism, the first and second position sensors are installed at the starting position of the feed shoe, and the third position sensor is installed at the end position of the feed shoe movement; the position sensor controls the starting position and end position of the feed shoe movement by feeding back the position information to the programmable controller.

[0030] like Figure 2 The filling module and its fastening device shown, the filling module includes a feeding shoe 8, a test platform 9 and a multi-suction hole mold 10;

[0031] The feed shoe is a flat cavity structure that runs through the top and bottom. Its top is designed to be funnel-shaped. The rear side of the feed shoe is fixed to the screw slider mechanism through a fastening device and can move linearly with the screw slider. The bottom surface of the feed shoe is tightly attached to the upper surface of the test platform and is suspended on the upper surface of the test platform;

[0032] The test platform is provided with a through hole in the middle of the lead screw slider mechanism, and the upper end opening of the multi-suction hole mold is detachably connected to the through hole of the test platform;

[0033] The feeding shoe adds powder and moves linearly on the experimental platform. When the feeding shoe passes through the multi-suction hole mold and the through holes on the experimental platform, the powder flows into the multi-suction hole mold.

[0034] like Figure 3 The air intake module shown includes a powder filter 11, a powder settling pipeline 12, a rotor flowmeter 13 and an air compressor 14;

[0035] The powder filter is connected to an air suction hole of the multi-air suction hole mold to preliminarily filter the powder entering the air suction module through the air suction hole;

[0036] The two ends of the powder settling pipeline are respectively connected to a powder filter and a flow meter to further settle the powder entering the air intake module through the air intake hole and protect the flow meter;

[0037] The air inlet of the flow meter is connected to the powder sedimentation pipeline, and the air outlet is connected to the air compressor, and cooperates with the air compressor to control the air flow rate of the air intake module.

[0038] Embodiment 1

[0039] This embodiment discloses a suction mold filling test method, see the attached Figure 1 , 3 , 4, 5, including:

[0040] An air suction device is added to the mold filling system to remove the air in the mold cavity during the mold filling process and prevent the occurrence of escaping airflow, thereby achieving rapid exhaust of the mold filling process to eliminate the influence of air on the mold filling process;

[0041] In the embodiment, the air in the multi-suction hole mold is continuously sucked out under the action of the suction module, and the film cavity is always in a negative pressure state. When the feeding shoe carries the target powder through the multi-suction hole mold and the through hole on the experimental platform, the powder efficiently flows into the mold cavity under the action of gravity and the negative pressure of the mold cavity;

[0042] The embodiment avoids the problem that the enclosed air mass in the mold is blocked from being discharged during gravity mold filling, and can only overflow through the gap between the material bed, thereby eliminating the obstruction of air to powder in the subsequent mold filling process;

[0043] The air suction mold filling method can significantly increase the critical mold filling speed of the powder, and further improve the powder mold filling efficiency.

[0044] Embodiment 2

[0045] This embodiment discloses the use of a suction mold filling test device and a multi-suction hole mold cavity to study the powder filling characteristics and gas flow characteristics. Figure 1 , 3 , 4, 5, including:

[0046] In the embodiment, four suction holes of the multi-suction hole mold are used, and the suction modules are respectively connected to the four suction holes at different positions to perform suction mold filling test;

[0047] In the embodiment, by changing the position where the air suction module is connected to the mold with multiple air suction holes, the flow behavior of the enclosed air mass in the mold during mold filling can be obtained, thereby revealing the qualitative and quantitative relationship between the position of the air suction holes and the powder filling.

[0048] In the embodiment, the rotor flowmeter in the suction module is adjusted to accurately control the suction flow acting on the mold with multiple suction holes, and suction filling mold tests with different suction flow rates are performed;

[0049] In the embodiment, by controlling the suction flow rate, the influence of different suction flow rates on the mold filling process can be obtained, thereby revealing the qualitative and quantitative relationship between the suction flow rate and powder mold filling.

Claims

1. A suction mold filling method and test device, characterized in that: include: Control module, filling module and suction module. The control module includes a programmable controller, a frequency converter, a touch screen, a control cabinet, a position sensor, a servo motor and a lead screw slider mechanism. The touch screen is used to transmit control information to the programmable controller and the frequency converter to control the servo motor to drive the lead screw slider to perform linear motion. A position sensor is provided on the bracket of the lead screw slider mechanism. The filling mold module includes a feed shoe, a test platform, and a multi-suction hole mold. The rear side of the feed shoe is fixed on the lead screw slider mechanism and can move with the lead screw slider. The whole is suspended on the upper surface of the test platform. A through hole is provided in the middle of the test platform. The multi-suction hole mold is vertically arranged and detachably connected to the through hole of the test platform. The air suction module includes an air compressor, a rotor flowmeter, a powder sedimentation pipeline, and a powder filter. The powder filter is connected to an air suction hole of a multi-suction hole mold. The two ends of the powder sedimentation pipeline are respectively connected to the powder filter and the rotor flowmeter, and the rotor flowmeter is connected to the air compressor.

2. A suction mold filling method and test device according to claim 1, characterized in that: The programmable controller, frequency converter and touch screen are installed in the control cabinet, and the servo motor and lead screw slider mechanism are installed on the test platform.

3. A suction mold filling method and test device according to claim 1, characterized in that: The position sensor is used to monitor the position of the feed shoe and feed the position information back to the programmable controller for precise control.

4. A suction mold filling method and test device according to claim 1, characterized in that: The touch screen can set and control parameters such as speed, stroke and movement mode of the filling process.

5. The air suction mold filling method and test device according to claim 1, characterized in that: The feeding shoe is a flat cavity structure that runs through the top and bottom, and its top is designed to be funnel-shaped to facilitate the filling of powder; The feed shoe is made of transparent plexiglass to facilitate observation of the flow behavior of the powder during mold filling.

6. The air suction mold filling method and test device according to claim 1, characterized in that: The multi-suction hole mold is flat, with an opening on the upper end face connected to the through hole of the test platform, an air suction hole in the middle of the bottom and three air suction ports on the right side. Each air suction hole can be in a closed state or an unobstructed state. The multi-suction hole mold is made of transparent plexiglass to observe the flow behavior of the powder during the filling process.

7. The air suction mold filling method and test device according to claim 1, characterized in that: The upper end surface of the multi-suction hole mold overlaps with the upper table surface of the test platform and the lower end surface of the feeding shoe in the horizontal direction.

8. The air suction mold filling method and test device according to claim 1, characterized in that: Each suction hole of the multi-suction hole mold can be connected to the suction module.

9. The air suction mold filling method and test device according to claim 1, characterized in that: The rotor flowmeter is used to measure the gas flow discharged from the suction holes of the multi-suction hole mold.

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