Surface treatment method for semi-solid magnesium alloy die casting

Abstract

The invention discloses a surface treatment method of a semi-solid magnesium alloy die casting, which adopts a grinding device provided with a friction ball to grind the inner wall of a pore channel of the semi-solid magnesium alloy die casting, and comprises the following steps: putting the elastic hollow friction ball into the pore channel; and in the process that the friction ball reciprocates along the hole channel, the inner wall of the hole channel is polished, and burrs on the inner wall of the hole channel are removed. The inner wall of a hole channel of the semi-solid magnesium alloy die casting can be polished, so that burrs on the inner wall of the hole channel are removed; the method can be suitable for pore channels with non-linear sections, especially pore channels with arc-shaped sections, wave sections, spiral sections and the like; dust in the hole channel can be timely pumped away in the polishing process, and then the polishing efficiency and effect can be improved; and the positions of burrs in the hole channels can be recognized, then small-range grinding is conducted on the positions of the burrs, and the burrs can be removed more accurately and more efficiently.

Description

Technical Field

[0001] This invention relates to a surface treatment method for semi-solid magnesium alloy die castings. Background Technology

[0002] Semi-solid magnesium alloy die castings are widely used in the automotive, aerospace, and electronics industries due to their lightweight, high strength, and excellent corrosion resistance. Some semi-solid magnesium alloy die castings have through-holes, and the inner walls of these holes need to be ground to remove burrs. However, if the holes include non-linear sections, especially curved, wavy, or spiral sections, grinding the inner walls becomes difficult. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a surface treatment method for semi-solid magnesium alloy die castings. The method employs a grinding device equipped with friction balls to grind the inner wall of the duct within the semi-solid magnesium alloy die casting. The method includes the following steps: placing an elastic, hollow friction ball into the duct; causing the friction ball to reciprocate along the duct; during this reciprocating motion (the friction ball both rolls and slides within the duct), grinding the inner wall of the duct to remove burrs.

[0004] Preferably, the position of the friction ball in the channel is continuously monitored, as is the internal air pressure of the friction ball; the position of the burr in the channel is identified based on the sudden change in the internal air pressure of the friction ball and the position of the friction ball in the channel at the time of the sudden change (the internal air pressure of the friction ball will change when the friction ball passes through the burr), and the friction ball is moved back and forth a small distance at the burr position (i.e., a small area is polished at the burr position), so as to remove the burr more accurately and efficiently.

[0005] Preferably, the channel is a through channel, and the channel includes non-straight segments, and the inner diameter of the channel is the same at all points; the non-straight segments include one or more of the following: arc segments, wavy segments, spiral segments, etc.

[0006] Preferably, the polishing device includes: a friction ball disposed in the channel; a dust collection device and a main control device disposed outside the channel; a first suction pipe connected to one end of the channel and communicating with the dust collection device; a first suction solenoid valve and a first suction check valve disposed on the first suction pipe; a first air inlet pipe connected to the first suction pipe; a first air inlet solenoid valve and a first air inlet check valve disposed on the first air inlet pipe; a second suction pipe connected to the other end of the channel and communicating with the dust collection device; a second suction solenoid valve and a second suction check valve disposed on the second suction pipe; and an external... A second air inlet pipe is connected to the second air extraction pipe, and a second air inlet solenoid valve and a second air inlet check valve are provided on the second air inlet pipe; the first air extraction solenoid valve, the first air inlet solenoid valve, the second air extraction solenoid valve, and the second air inlet solenoid valve are wired or wirelessly connected to the main control device; the friction ball includes: an inflatable balloon, friction blocks evenly distributed on the outer wall of the balloon, an inflation port on the outer wall of the balloon that can be self-sealed, and a pressure sensor and a displacement sensor located inside the balloon; the pressure sensor and the displacement sensor are wirelessly connected to the main control device.

[0007] Preferably, the first suction solenoid valve, the first suction check valve, and the first air inlet pipe are sequentially arranged on the first suction pipe, and the first suction solenoid valve is located between the dust collection device and the first suction check valve; the first suction check valve only allows airflow from the first suction check valve to the first suction solenoid valve; the first air inlet check valve is located between the first air inlet solenoid valve and the first suction pipe; the first air inlet check valve only allows airflow from the first air inlet check valve to the first suction pipe.

[0008] Preferably, the second suction solenoid valve, the second suction check valve, and the second air inlet pipe are sequentially arranged on the second suction pipe, and the second suction solenoid valve is located between the dust collection device and the second suction check valve; the second suction check valve only allows airflow from the second suction check valve to the second suction solenoid valve; the second air inlet check valve is located between the second air inlet solenoid valve and the second suction pipe; the second air inlet check valve only allows airflow from the second air inlet check valve to the second suction pipe.

[0009] Preferably, the specific steps include the following: The friction ball is placed into the channel; the main control device continuously monitors the position of the friction ball in the channel through the displacement sensor, and the main control device continuously monitors the air pressure inside the balloon through the air pressure sensor; the balloon is inflated through the inflation port until the air pressure inside the balloon reaches the predetermined air pressure range. At this time, the friction block on the outer wall of the balloon is in contact with the inner wall of the channel and applies a certain pressure to the inner wall of the channel. Then, the first and second suction pipes are connected externally to both ends of the channel; the vacuum cleaner continuously suctions air from the first and second suction pipes; and the main control device controls the first suction solenoid valve, the first intake solenoid valve, the second suction solenoid valve, and the second intake solenoid valve to operate, causing the friction ball to move back and forth along the channel; specifically: the first suction solenoid valve and the first intake solenoid valve open and close alternately, the second suction solenoid valve and the second intake solenoid valve open and close alternately, the first suction solenoid valve and the second intake solenoid valve open and close alternately, the first suction solenoid valve and the second intake solenoid valve open and close synchronously, and the second suction solenoid valve and the first intake solenoid valve open and close synchronously; the first suction solenoid valve and the second intake solenoid valve... When the solenoid valve is open and the second suction solenoid valve and the first intake solenoid valve are closed, the dust collection device draws air from the channel through the first suction pipe and removes dust and debris from the channel. The suction of the dust collection device also drives the friction ball to move along the channel towards the first suction pipe, while external air enters the channel through the second intake pipe. When the second suction solenoid valve and the first intake solenoid valve are open and the first suction solenoid valve and the second intake solenoid valve are closed, the dust collection device draws air from the channel through the second suction pipe and removes dust and debris from the channel. The suction of the dust collection device also drives the friction ball to move along the channel towards the second suction pipe, while external air enters the channel through the first intake pipe. During the reciprocating movement of the friction ball along the channel, it polishes the inner wall of the channel, removing burrs.

[0010] Preferably, the main control device identifies the location of burrs in the channel based on the sudden change in air pressure inside the balloon and the position of the friction ball in the channel during the sudden change (when the friction ball passes through the burr, the air pressure inside the balloon will change suddenly, deviating from the predetermined air pressure range), and makes the friction ball move back and forth a small distance at the burr location (i.e., perform small-area grinding at the burr location) until the internal air pressure of the balloon at the burr location returns to the predetermined air pressure range, so as to remove burrs more accurately and efficiently.

[0011] Preferably, after grinding, the first and second suction pipes are separated from both ends of the channel, and the friction ball is removed from the channel.

[0012] Preferably, before removing the friction ball from the channel, the balloon is first evacuated through the inflation port to retract the balloon, making it easier to remove the friction ball from the channel.

[0013] The advantages and beneficial effects of this invention are as follows: It provides a surface treatment method for semi-solid magnesium alloy die castings, which can grind the inner wall of the channel of the semi-solid magnesium alloy die casting to remove burrs on the inner wall of the channel; and this invention is applicable to channels with non-linear segments, especially channels with arc segments, wavy segments, spiral segments, etc.; it can also remove dust and debris from the channel in time during the grinding process, thereby improving the grinding efficiency and effect; it can also identify the burr position in the channel, and then perform small-area grinding at the burr position, which can remove burrs more accurately and efficiently.

[0014] This invention has the following characteristics: The present invention uses an elastic hollow friction ball (a ball with friction blocks evenly distributed on its outer wall) to reciprocate in the channel (the friction ball both rolls and slides in the channel) to polish the inner wall of the channel. This makes the present invention applicable to channels with non-linear sections, especially channels with arc sections, wavy sections, spiral sections, etc. The present invention has a first air extraction pipe and a second air extraction pipe connected to both ends of the channel and both connected to a dust collection device, and the dust collection device continuously extracts air, so as to remove dust and debris from the channel in a timely and efficient manner, thereby improving the efficiency and effect of polishing. This invention controls the opening and closing states of the first suction solenoid valve, the first intake solenoid valve, the second suction solenoid valve, and the second intake solenoid valve, so that the friction ball is driven to reciprocate in the channel by only the suction of the dust collection device. This eliminates the need for a separate drive source for the friction ball grinding. In other words, this invention uses a single drive source (dust collection device) to simultaneously drive the friction ball to grind and remove dust from the channel. This makes the grinding device simpler, more efficient, and lower in cost, making this invention highly practical. The present invention also provides external air to both ends of the channel alternately through the first air inlet pipe and the second air inlet pipe while the vacuum cleaner is continuously pumping air. This can work with the vacuum cleaner to drive the friction ball to move back and forth in the channel by only pumping air from the vacuum cleaner. This can avoid the polishing device from not working properly because the channel is simply being pumped out and forming a negative pressure (vacuum). This invention utilizes a pressure sensor and a displacement sensor inside the friction ball (balloon) to continuously monitor the position of the friction ball within the channel and the internal air pressure of the friction ball, in conjunction with a main control device. Furthermore, this invention can identify the location of burrs in the channel based on sudden changes in the internal air pressure of the friction ball (balloon) and the position of the friction ball within the channel at the time of these changes (when the friction ball passes over a burr, the internal air pressure of the friction ball will change abruptly). It then causes the friction ball to reciprocate a short distance at the burr location, enabling small-scale polishing at the burr location, thus removing burrs more precisely and efficiently. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0016] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0017] The specific technical solution of this invention is as follows: like Figure 1As shown, the present invention provides a surface treatment method for semi-solid magnesium alloy die castings, wherein a grinding device is used to grind the inner wall of the channel 8 of the semi-solid magnesium alloy die casting; the channel 8 is a through channel, and the channel 8 includes a non-straight segment, which includes one or more of the following: arc segment, wave segment, spiral segment, etc., and the inner diameter of the channel 8 is the same at all points. The polishing device includes: a friction ball 1 disposed in the channel 8; a dust collection device and a main control device (not shown in the figure) disposed outside the channel 8; a first suction pipe 21 externally connected to one end of the channel 8 and communicating with the dust collection device; a first suction solenoid valve 31 and a first suction check valve 41 disposed on the first suction pipe 21; a first air inlet pipe 51 externally connected to the first suction pipe 21; a first air inlet solenoid valve 61 and a first air inlet check valve 71 disposed on the first air inlet pipe 51; a second suction pipe 22 externally connected to the other end of the channel 8 and communicating with the dust collection device; and a second suction pipe 22 disposed on the second suction pipe 22. Solenoid valve 32, second suction check valve 42, second air inlet pipe 52 externally connected to second suction pipe 22, second air inlet solenoid valve 62 and second air inlet check valve 72 disposed on second air inlet pipe 52; first suction solenoid valve 31, first suction check valve 41, and first air inlet pipe 51 are sequentially disposed on first suction pipe 21, and first suction solenoid valve 31 is located between the dust collection device and first suction check valve 41; first suction check valve 41 only allows airflow from first suction check valve 41 to first suction solenoid valve 31; first air inlet check valve 71 is located between first air inlet solenoid valve 61 and first suction pipe 22. Between pipes 21; the first intake check valve 71 only allows airflow from the first intake check valve 71 to the first suction pipe 21; the second suction solenoid valve 32, the second suction check valve 42, and the second intake pipe 52 are sequentially arranged on the second suction pipe 22, and the second suction solenoid valve 32 is between the dust collection device and the second suction check valve 42; the second suction check valve 42 only allows airflow from the second suction check valve 42 to the second suction solenoid valve 32; the second intake check valve 72 is between the second intake solenoid valve 62 and the second suction pipe 22; the second intake check valve 72 only allows airflow from the first intake check valve 62 to the second suction pipe 21. The second intake check valve 72 allows air to pass through the second extraction pipe 22; the first extraction solenoid valve 31, the first intake solenoid valve 61, the second extraction solenoid valve 32, and the second intake solenoid valve 62 are wired or wirelessly connected to the main control device; the friction ball 1 includes: an inflatable balloon 11, friction blocks 12 evenly distributed on the outer wall of the balloon 11, an inflation port (not shown in the figure) located on the outer wall of the balloon 11 and capable of self-sealing, and a pressure sensor and a displacement sensor (not shown in the figure) located inside the balloon 11; the pressure sensor and the displacement sensor are wirelessly connected to the main control device. The grinding of the inner wall of the channel 8 of the semi-solid magnesium alloy die casting using a grinding device includes the following steps: Friction ball 1 is placed into channel 8; the main control device continuously monitors the position of friction ball 1 in channel 8 through displacement sensor, and continuously monitors the internal air pressure of balloon 11 through air pressure sensor; balloon 11 is inflated through inflation port until the internal air pressure of balloon 11 reaches the predetermined air pressure range. At this time, friction block 12 on outer wall of balloon 11 is in contact with inner wall of channel 8 and applies a certain pressure to inner wall of channel 8. Then, the first suction pipe 21 and the second suction pipe 22 are externally connected to both ends of the channel 8; then, the dust collection device continuously suctions air from the first suction pipe 21 and the second suction pipe 22; and the main control device controls the first suction solenoid valve 31, the first intake solenoid valve 61, the second suction solenoid valve 32, and the second intake solenoid valve 62 to work, causing the friction ball 1 to move back and forth along the channel 8; specifically: the first suction solenoid valve 31 and the first intake solenoid valve 61 open and close alternately, the second suction solenoid valve 32 and the second intake solenoid valve 62 open and close alternately, the first suction solenoid valve 31 and the second suction solenoid valve 32 open and close alternately, the first intake solenoid valve 61 and the second intake solenoid valve 62 open and close alternately, the first suction solenoid valve 31 and the second intake solenoid valve 62 open and close synchronously, the second suction solenoid valve 32 and the first intake solenoid valve 61 open and close synchronously; the first suction solenoid valve 31 and the second intake solenoid valve 62 are open and When the second suction solenoid valve 32 and the first intake solenoid valve 61 are closed, the dust collection device draws air from the channel 8 through the first suction pipe 21 and removes dust and debris from the channel 8. The suction of the dust collection device also drives the friction ball 1 to move along the channel 8 towards the first suction pipe 21, and external air is supplied into the channel 8 through the second intake pipe 52. When the second suction solenoid valve 32 and the first intake solenoid valve 61 are open and the first suction solenoid valve 32 and the second intake solenoid valve 62 are closed, the dust collection device draws air from the channel 8 through the second suction pipe 22 and removes dust and debris from the channel 8. The suction of the dust collection device also drives the friction ball 1 to move along the channel 8 towards the second suction pipe 22, and external air is supplied into the channel 8 through the first intake pipe 51. During the reciprocating movement of the friction ball 1 along the channel 8 (the friction ball 1 both rolls and slides within the channel 8), it polishes the inner wall of the channel 8, removing burrs from the inner wall of the channel 8. Furthermore, the main control device identifies the burr position in the channel 8 based on the sudden change in air pressure inside the balloon 11 and the position of the friction ball 1 in the channel 8 during the sudden change (when the friction ball 1 passes through the burr, the air pressure inside the balloon 11 will change suddenly, deviating from the predetermined air pressure range), and makes the friction ball 1 move back and forth a small distance at the burr position (i.e., perform small-area grinding at the burr position) until the internal air pressure of the balloon 11 at the burr position returns to the predetermined air pressure range, so as to remove burrs more accurately and efficiently. After polishing, the first suction pipe 21 and the second suction pipe 22 are separated from the two ends of the channel 8, and the friction ball 1 is taken out from the channel 8. Before taking the friction ball 1 out from the channel 8, the balloon 11 is evacuated through the inflation port to make the balloon 11 retract, so as to facilitate the removal of the friction ball 1 from the channel 8.

[0018] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A surface treatment method for semi-solid magnesium alloy die castings, characterized in that, The grinding device equipped with friction balls is used to grind the inner wall of the hole in a semi-solid magnesium alloy die casting. The process includes the following steps: placing the elastic hollow friction ball into the hole; moving the friction ball back and forth along the hole, and grinding the inner wall of the hole during the back and forth movement of the friction ball to remove burrs from the inner wall of the hole.

2. The surface treatment method for semi-solid magnesium alloy die castings according to claim 1, characterized in that, The position of the friction ball in the channel is continuously monitored, as is the internal air pressure of the friction ball. The location of the burr in the channel is identified by the sudden change in the internal air pressure of the friction ball and the position of the friction ball in the channel at the time of the sudden change. The friction ball is then moved back and forth a short distance at the burr location to remove burrs more accurately and efficiently.

3. The surface treatment method for semi-solid magnesium alloy die castings according to claim 2, characterized in that, The channel is a through channel, and the channel includes non-straight segments.

4. The surface treatment method for semi-solid magnesium alloy die castings according to claim 3, characterized in that, The polishing device includes: a friction ball disposed in the channel; a dust collection device and a main control device disposed outside the channel; a first suction pipe externally connected to one end of the channel and communicating with the dust collection device; a first suction solenoid valve and a first suction check valve disposed on the first suction pipe; a first air inlet pipe externally connected to the first suction pipe; a first air inlet solenoid valve and a first air inlet check valve disposed on the first air inlet pipe; a second suction pipe externally connected to the other end of the channel and communicating with the dust collection device; a second suction solenoid valve and a second suction check valve disposed on the second suction pipe; and a first air inlet pipe externally connected to the other end of the channel and communicating with the dust collection device. The second intake pipe is located on the second exhaust pipe, and a second intake solenoid valve and a second intake check valve are installed on the second intake pipe; the first exhaust solenoid valve, the first intake solenoid valve, the second exhaust solenoid valve, and the second intake solenoid valve are wired or wirelessly connected to the main control device; the friction ball includes: an inflatable balloon, friction blocks evenly distributed on the outer wall of the balloon, an inflation port on the balloon that can be self-sealed, and a pressure sensor and a displacement sensor installed inside the balloon; the pressure sensor and the displacement sensor are wirelessly connected to the main control device.

5. The surface treatment method for semi-solid magnesium alloy die castings according to claim 4, characterized in that, The first suction solenoid valve, the first suction check valve, and the first air inlet pipe are sequentially arranged on the first suction pipe, and the first suction solenoid valve is located between the dust collection device and the first suction check valve; the first air inlet check valve is located between the first air inlet solenoid valve and the first suction pipe.

6. The surface treatment method for semi-solid magnesium alloy die castings according to claim 5, characterized in that, The second suction solenoid valve, the second suction check valve, and the second air inlet pipe are sequentially arranged on the second suction pipe, and the second suction solenoid valve is located between the dust collection device and the second suction check valve; the second air inlet check valve is located between the second air inlet solenoid valve and the second suction pipe.

7. The surface treatment method for semi-solid magnesium alloy die castings according to claim 6, characterized in that, The specific steps include the following: The friction ball is placed into the channel; the main control device continuously monitors the position of the friction ball in the channel through the displacement sensor, and the main control device continuously monitors the air pressure inside the balloon through the air pressure sensor; the balloon is inflated through the inflation port until the air pressure inside the balloon reaches the predetermined air pressure range. Then, the first and second suction pipes are connected to both ends of the channel; the vacuum cleaner continuously draws air from the first and second suction pipes; and the main control device controls the first suction solenoid valve, the first intake solenoid valve, the second suction solenoid valve, and the second intake solenoid valve to operate, causing the friction ball to move back and forth along the channel; specifically: the first suction solenoid valve and the first intake solenoid valve open and close alternately, the second suction solenoid valve and the second intake solenoid valve open and close alternately, the first suction solenoid valve and the second intake solenoid valve open and close synchronously, and the second suction solenoid valve and the first intake solenoid valve open synchronously. When the first suction solenoid valve and the second intake solenoid valve are open, the dust extraction device draws air from the channel through the first suction pipe and removes dust and debris from the channel, while driving the friction ball to move along the channel towards the first suction pipe. External air is replenished into the channel through the second intake pipe. When the second suction solenoid valve and the first intake solenoid valve are open, the dust extraction device draws air from the channel through the second suction pipe and removes dust and debris from the channel, while driving the friction ball to move along the channel towards the second suction pipe. External air is replenished into the channel through the first intake pipe. During the reciprocating movement of the friction ball along the channel, the inner wall of the channel is polished to remove burrs.

8. The surface treatment method for semi-solid magnesium alloy die castings according to claim 7, characterized in that, The main control device identifies the location of the burr in the channel based on the sudden change in air pressure inside the balloon and the position of the friction ball in the channel during the sudden change. It then moves the friction ball back and forth a small distance at the burr location until the internal air pressure of the balloon at the burr location returns to the predetermined air pressure range.

9. The surface treatment method for semi-solid magnesium alloy die castings according to claim 8, characterized in that, After polishing, separate the first and second suction pipes from both ends of the channel, and remove the friction ball from the channel.

10. The surface treatment method for semi-solid magnesium alloy die castings according to claim 9, characterized in that, Before removing the friction ball from the channel, first deflate the balloon through the inflation port to make the balloon retract, so that the friction ball can be easily removed from the channel.

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