Tubular electrode and horizontal internal combustion engine cylinder automatic coating device

Abstract

The upper part of the tubular electrode is provided with a strip-shaped protruding part. The protruding parts are crescent fins, and the crescent fins are equal in height and are perpendicular to the axis of the tubular electrode. The invention further provides a horizontal type internal combustion engine air cylinder automatic coating device, the tubular electrode is arranged along the axis of an inner cavity of an internal combustion engine air cylinder to be treated, and the overall length of the protruding part is the same as the length of the inner cavity of the internal combustion engine air cylinder to be treated. According to the tubular electrode and the horizontal type internal combustion engine cylinder automatic coating device, the distance between the tubular electrode and the internal combustion engine cylinder inner cavity wall is reduced through the protruding part on the back of the tubular electrode, so that the electric field between the electrode and the internal combustion engine cylinder inner cavity wall is enhanced, and the film forming quality efficiency of the upper portion of the internal combustion engine cylinder inner cavity wall in the oxidation process is improved; and the film forming thickness at the upper part of the inner cavity wall of the internal combustion engine cylinder is the same as that at other parts, so that the defect that the film forming thickness at the upper part of the inner cavity wall of the cylinder is thin in the existing horizontal internal combustion engine cylinder coating device is overcome.

Description

Technical Field

[0001] The invention relates to a light metal surface treatment technology, in particular to a tubular electrode and a horizontal internal combustion engine cylinder automatic coating device equipped with the tubular electrode. Background Art

[0002] Patent (CN2023216811129) discloses an automatic coating device for an internal combustion engine cylinder, which places the internal combustion engine cylinder to be processed horizontally, inserts the pipe electrode into the inner cavity of the internal combustion engine cylinder to be processed, and then closes the two sides of the cylinder with joints, and introduces electrolyte into the internal combustion engine cylinder and the tubular electrode through the joints. The disadvantage of this oxidation treatment method for the inner cavity wall of the cylinder is that the film layer formed on the upper inner cavity wall of the cylinder is significantly thinner than that on other parts ( Figure 4 ). One possible reason for this is that during oxidation, the bubbles formed in the cylinder cavity float up and gather at the top of the cylinder cavity, changing the electric field shape in the upper part of the cylinder cavity and weakening the electric field strength. Therefore, this device can only process cylinders that do not require high uniformity of the film layer, and it is difficult to meet the coating requirements of high-quality internal combustion engine cylinders. Summary of the invention

[0003] The purpose of the present invention is to provide a tubular electrode suitable for a horizontal internal combustion engine cylinder coating device and a horizontal internal combustion engine cylinder automatic coating device equipped with the tubular electrode, so as to overcome the defect that the existing horizontal internal combustion engine cylinder coating device is difficult to process high-quality internal combustion engine cylinders.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows:

[0005] The utility model relates to a tubular electrode, which is arranged horizontally and has a strip-shaped protrusion on the upper part of the tubular electrode.

[0006] Furthermore, the cross section of the protrusion is crescent-shaped.

[0007] Furthermore, the protrusion includes a plurality of protrusions, and the protrusions are arranged along the axis of the tubular electrode.

[0008] Furthermore, the protrusion is a crescent-shaped fin.

[0009] Furthermore, the crescent-shaped fins have the same height and are perpendicular to the axis of the tubular electrode.

[0010] Furthermore, the protrusion is integrally formed with the tubular electrode.

[0011] The present invention also provides a horizontal internal combustion engine cylinder automatic coating device, comprising an oxidation power source and an internal combustion engine cylinder to be processed, wherein the inner cavity of the internal combustion engine cylinder to be processed contains an electrolyte, the internal combustion engine cylinder to be processed is placed horizontally, and the above-mentioned tubular electrode is arranged along the axis of the inner cavity of the internal combustion engine cylinder to be processed, and the tubular electrode and the internal combustion engine cylinder to be processed are connected to the oxidation power source through a wire.

[0012] Furthermore, the protrusion is opposite to the inner cavity of the cylinder of the internal combustion engine to be processed and the two are of equal length.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are:

[0014] The tubular electrode and horizontal internal combustion engine cylinder automatic coating device of the present invention reduces the distance between the tubular electrode and the inner wall of the internal combustion engine cylinder by the protrusion on the back of the tubular electrode, so as to strengthen the electric field between the electrode and the inner wall of the internal combustion engine cylinder, improve the film forming quality efficiency of the upper part of the inner wall of the internal combustion engine cylinder during oxidation, make the film forming thickness of the upper part of the inner wall of the internal combustion engine cylinder the same as other parts, and make up for the defect of thin film forming thickness on the upper part of the inner wall of the cylinder in the existing horizontal internal combustion engine cylinder coating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal combustion engine cylinder inner wall film thickness measurement method of the present invention;

[0016] Figure 2 is the measurement result of the cylinder inner wall film thickness of comparative example 1 of the present invention;

[0017] Figure 3 It is a schematic structural diagram of an automatic coating device for a cylinder of a horizontal internal combustion engine according to Embodiment 1 of the present invention;

[0018] Figure 4 is a front view of a tubular electrode used in Example 1 of the present invention;

[0019] Figure 5 is a side view of a tubular electrode used in Example 1 of the present invention;

[0020] Figure 6 This is the measurement result of the cylinder inner wall film thickness of Example 1 of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Comparative Example 1:

[0023] Refer to patent CN2023216811129 to assemble an automatic coating device for aluminum internal combustion engine cylinders.

[0024] The electrolyte is a silicate system, the temperature of the electrolyte is controlled at 20-25°C, the oxidation power supply is a bidirectional pulse power supply, the frequency is 600Hz, the working mode is a constant current mode, the voltage floats, and the current density is 8A / dm 2 The oxidation treatment time is 90 minutes; the workpiece to be treated is an aluminum cylinder sleeve with a length of 97 mm and an inner diameter of 68 mm; the tubular electrode is a stainless steel electrode with an outer diameter of 30 mm. After the oxidation treatment is completed, the cylinder is removed and the film thickness of the cylinder inner wall is measured with an eddy current thickness gauge. The measurement method is as follows Figure 1 As shown, five circles are taken from left to right along the cylinder axis at equal intervals and numbered 1-5 in sequence. A measurement point is taken from the bottom, left, top and right sides of each circle and numbered Ⅰ, Ⅱ, Ⅲ and Ⅳ in sequence. The measurement results are shown in Figure 2 As shown, it can be seen that the membrane thickness in the upper area of ​​the lumen wall is significantly thinner than that at other sites.

[0025] Embodiment 1:

[0026] like Figure 3 As shown, a horizontal internal combustion engine cylinder automatic coating device of the present invention is different from the comparative example 1 in that the upper part of the tubular electrode 1 used has a protrusion 101 ( Figure 4 , Figure 5 ), the protrusion 101 is opposite to the inner cavity of the internal combustion engine cylinder 7 to be treated and the overall length of the protrusion 101 is the same as the inner cavity length of the internal combustion engine cylinder 7 to be treated. The protrusion 101 on the back of the tubular electrode 1 reduces the distance between the tubular electrode 1 and the inner cavity wall of the internal combustion engine cylinder 7 to strengthen the electric field between the electrode and the inner cavity wall of the internal combustion engine cylinder, improve the film forming efficiency of the upper part of the inner cavity wall of the internal combustion engine cylinder during oxidation, and make the film forming thickness of the upper part of the inner cavity wall of the internal combustion engine cylinder the same as that of other parts. Preferably, the protrusion 101 is composed of 7 identical crescent-shaped fins arranged at equal intervals along the axis of the tubular electrode 1.

[0027] The oxidation process and measurement method are the same as those in Comparative Example 1. The measurement results of the film thickness of the cylinder inner wall of this embodiment are as follows: Figure 6 As shown, after adopting the new tubular electrode with dorsal fin, the film thickness in the upper area of ​​the inner wall of the cylinder of the internal combustion engine is basically consistent with that in other parts.

Claims

1. A tubular electrode, the tubular electrode is arranged horizontally, characterized in that: The upper part of the tubular electrode is provided with a strip-shaped protrusion.

2. A tubular electrode according to claim 1, characterized in that: The cross section of the protrusion is crescent-shaped.

3. A tubular electrode according to claim 1, characterized in that: The protrusion includes a plurality of protrusions, and the protrusions are arranged along the axis of the tubular electrode.

4. A tubular electrode according to claim 3, characterized in that: The projection is a crescent-shaped fin.

5. A tubular electrode according to claim 1, characterized in that: The crescent-shaped fins have the same height and are perpendicular to the axis of the tubular electrode.

6. A tubular electrode according to any one of claims 1 to 5, characterized in that: The protrusion is integrally formed with the tubular electrode.

7. An automatic coating device for horizontal internal combustion engine cylinder, characterized in that: It comprises an oxidation power source and a cylinder of an internal combustion engine to be treated, wherein the inner cavity of the cylinder of the internal combustion engine to be treated has an electrolyte, the cylinder of the internal combustion engine to be treated is placed horizontally, and a tubular electrode as described in any one of claims 1 to 6 is arranged along the axis of the inner cavity of the cylinder of the internal combustion engine to be treated, and the tubular electrode and the cylinder of the internal combustion engine to be treated are connected to the oxidation power source through a wire.

8. An automatic coating device for a horizontal internal combustion engine cylinder, characterized in that: The protrusion is opposite to the inner cavity of the cylinder of the internal combustion engine to be processed and the two are of equal length.

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