A method for corrosion protection treatment of a surface of a machined part

Abstract

The present application relates to the field of machining, and provide a kind of anticorrosion method of machining casting, the side wall through hole of machined part is provided with a counterbore, anticorrosion method includes the following steps: using positioning pin insertion side wall through hole after the end face of the counterbore is carried out zinc spraying treatment;Prepare rubber washer and magnet piece, through hole is opened in the rubber washer and the magnet piece, bolt is sequentially fixed in the positioning pin by through hole of the magnet piece and through hole of the rubber washer and is made to obtain protection piece;The positioning pin on the protection piece in the above S2 step is inserted into side wall through hole and is carried out paint spraying treatment;After paint surface solidification, the protection piece is removed, and the inner circle of the side wall through hole is carried out oiling treatment.Can effectively solve the operation problem of multiple anticorrosion requirements in the same part, fast installation, wide use, strong versatility, improve operation efficiency, and improve the quality of anticorrosion effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mechanical processing, and more particularly to a kind of anticorrosion treatment method of mechanical processing casting. BACKGROUND

[0002] Casting needs to be anticorrosion treated according to requirements in the process of mechanical processing, but different parts require different methods, especially the same part has multiple anticorrosion requirements, such as a through hole with a counterbore, which needs to be treated in different ways, such as through hole oiling, counterbore inner circle paint spraying, counterbore end face part zinc spraying, part paint spraying, etc., which has very high requirements for the protection of this part of anticorrosion. For example, the casting side wall of offshore wind turbine rotor has nearly a thousand 16.5mm diameter through holes, and a 52mm diameter counterbore is arranged on each through hole, but the anticorrosion requirements of different positions of each hole are different, such as through hole oiling, counterbore inner circle paint spraying, counterbore end face part zinc spraying, part paint spraying, i.e. the same part has multiple anticorrosion requirements. Therefore, special requirements are put forward for anticorrosion treatment, such as poor protection, which may contaminate the zinc spraying surface with paint, the original method of using stickers to cover the zinc spraying surface, the position of the stickers is not easy to determine, and after paint spraying, the paint and stickers are difficult to separate, and the stickers are difficult to remove from the workpiece surface, and the stickers are easy to damage the already coated paint, and after the stickers are removed, part of the glue remains on the workpiece surface and is difficult to remove, the installation and tearing of each sticker is particularly low in efficiency, and the quality of anticorrosion treatment is not high. SUMMARY

[0003] Therefore, the present application provides a kind of anticorrosion treatment method for the surface of mechanical processing piece, effectively solves the operation problem of different parts of multiple anticorrosion requirements, and the anticorrosion treatment method has a wide range of applications and high efficiency, and realizes the requirements of multiple anticorrosion of the same part.

[0004] To achieve the above object, the present application adopts the following technical scheme: a kind of anticorrosion treatment method for the surface of mechanical processing piece, a counterbore is arranged on the side wall through hole of the mechanical processing piece, and the anticorrosion method comprises the following steps:

[0005] S1: using a positioning pin to insert into the side wall through hole to spray zinc on the end face of the counterbore;

[0006] S2: prepare a rubber gasket and a magnet piece, and a through hole is formed in the rubber gasket and the magnet piece, and a bolt is fixed on the positioning pin by passing through the through hole of the magnet piece and the through hole of the rubber gasket to make a protection piece;

[0007] S3: inserting the positioning pin on the protection piece in S2 into the side wall through hole for paint spraying treatment; S4: after the paint surface solidifies, the protection piece is removed, and the inner circle of the side wall through hole is oiled.

[0008] In one of the embodiments, the diameter of the positioning pin is the same as the diameter of the side wall through hole.

[0009] In one of the embodiments, the length of the positioning pin is 1-1.5 times of the diameter of the positioning pin, and the length of the positioning pin is not more than the wall thickness of the workpiece.

[0010] In one of the embodiments, the size of the rubber gasket is the same as the size of the zinc spraying surface.

[0011] In one of the embodiments, the thickness of the rubber gasket is 2.8-3.2 mm.

[0012] In one of the embodiments, the thickness of the magnet sheet is 9-11 mm, and the size of the magnet sheet is 2-2.5 mm smaller than the size of the rubber gasket.

[0013] In one of the embodiments, the thickness of the zinc spraying surface is 150-300 μm during the zinc spraying process.

[0014] In one of the embodiments, when the protection piece is installed to the side wall through hole, the rubber gasket and the end surface of the counterbore are sealed to each other.

[0015] In one of the embodiments, the positioning pin is made of PVC material.

[0016] A machining tool for corrosion prevention of machined parts, characterized in that it comprises a rubber gasket, a magnet sheet, a positioning pin and a bolt, a through hole is formed in the rubber gasket and the magnet sheet, and the bolt is fixed on the positioning pin by passing through the through hole of the magnet sheet and the through hole of the rubber gasket in sequence.

[0017] The beneficial effects of the present application are as follows:

[0018] The present application provides a method for surface corrosion prevention of machined parts, which uses a positioning pin made of PVC material to determine the accurate position, and a magnet is adsorbed on the surface of the workpiece. In order to prevent paint from flowing into the gap between the magnet and the workpiece, a rubber gasket is adhered under the magnet to achieve the sealing effect of the magnet and the workpiece surface, and multiple corrosion prevention requirements for the same part are realized, and the spraying protection efficiency is guaranteed. The present application can effectively solve the problem of multiple corrosion prevention requirements for the same part. The present application can accurately position and quickly install, and has wide application range and strong universality, and can be used on other parts with multiple corrosion prevention requirements. The corrosion prevention operation efficiency is high, the operation efficiency is improved, and the corrosion prevention operation quality is effectively improved, which meets the corrosion prevention quality standard requirements and improves the corrosion prevention effect quality of the machined parts. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 : anticorrosion part drawing of machined part;

[0020] Figure 2 : explosion drawing of tool applied to anticorrosion treatment of machined part.

[0021] Explanation of reference signs:

[0022] hole-in-hole inner circle paint surface-1, hole paint surface-2, hole zinc spray surface-3, oil coating surface-4, M5 bolt-5, magnet piece-6, rubber gasket-7, positioning pin 8 DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application can be more thoroughly and completely understood.

[0024] The embodiment of the present application takes offshore wind power rotor castings as an example. The sidewall of the machined part has nearly a thousand sidewall through holes with a diameter of 16.5 mm, and each sidewall through hole has a hole with a diameter of 52 mm. In the mechanical processing engineering of the offshore wind power rotor, the above-mentioned parts need to be subjected to anticorrosion treatment, but there are various anticorrosion requirements for the same part, combined with the characteristics of the offshore wind power rotor castings, the anticorrosion requirements of the same part are as follows: Figure 1 , specifically including the requirement of oil coating on the inner circle of the sidewall through hole with a diameter of 16.5 mm, i.e. oil coating surface 4; the requirement of paint spraying on the inner circle of the hole with a diameter of 52 mm, i.e. hole-in-hole inner circle paint surface 1; the requirement of zinc spraying on the middle part of the end face with a diameter of 33 mm of the hole, i.e. hole zinc spray surface 3; and the requirement of paint spraying on other parts of the end face, i.e. hole paint surface 2. In order to ensure efficient and accurate completion of the anticorrosion work, the present application provides the following method for anticorrosion treatment, which is the anticorrosion treatment of a single sidewall through hole. The sidewall through holes on the machined part can be simultaneously treated uniformly.

[0025] First, a positioning pin with a diameter of 16.5 mm made of PVC material is inserted into the sidewall through hole with a diameter of 16.5 mm. Since zinc spraying is allowed before paint spraying, first, the zinc spraying part of all the end faces of the machined part is subjected to zinc spraying treatment. The length of the positioning pin is between 1-1.5 times the diameter of the positioning pin, and does not exceed the wall thickness of the workpiece. The protective part can be made simultaneously while the zinc anticorrosion treatment is being carried out. The thickness of the zinc spraying surface can be sprayed to 150-300 μm, and the zinc plating thickness in the present embodiment is 200 um.

[0026] The manufacturing material of the protection piece in the embodiment includes a positioning pin 8 made of PVC with a diameter of 16.5 mm, a rubber gasket 7 with a diameter of 33 mm, a magnet piece 6 with a diameter of 29 mm, and an M5 bolt 5. The thickness of the rubber gasket 6 is preferably 3 mm. The rubber gasket plays a sealing role. If the rubber gasket is too thin or too thick, the magnet piece cannot generate magnetic attraction with the workpiece to form the best sealing effect. The size of the magnet piece is 2 mm to 2.5 mm smaller than that of the rubber gasket. In the embodiment, a 29 mm magnet piece is used. The size of the rubber gasket is consistent with that of the zinc spraying surface 3 in the counterbore to avoid incorrect spraying to the zinc spraying part during painting and to meet the corrosion prevention requirement. The magnet piece is relatively thick. In order to avoid the magnet piece blocking during painting due to manufacturing tolerance and causing the magnet piece periphery to be unable to be sprayed, the size of the magnet piece is relatively smaller than that of the rubber gasket.

[0027] The selected positioning pin can accurately position the position, thereby improving the work efficiency. The size of the positioning pin can be determined according to the diameter of the side wall through hole. In the embodiment, the diameter of the positioning pin is consistent with the size of the side wall through hole. The fitting gap between the positioning pin and the side wall through hole can be controlled to be within 0.1 mm. In the embodiment, the thickness of the magnet piece 6 is controlled to be 10 mm. The magnetic attraction force of the magnet piece 6 can form sufficient attraction force with the workpiece to press the rubber gasket against the end surface of the counterbore and form mutual sealing. A through hole is formed at the concentric position of the rubber gasket 7 and the magnet piece 6. The through hole has the same diameter as the bolt, and the M5 bolt 5 is sequentially inserted through the through holes formed in the magnet piece 6 and the rubber gasket 7 and fixedly connected to the positioning pin 8.

[0028] After the zinc spraying treatment is completed, the painting treatment is performed. During painting, the positioning pin of the manufactured protection piece is inserted into the side wall through hole, magnetic force is generated between the magnet piece and the workpiece, the rubber gasket is pressed against the zinc spraying surface 3 of the counterbore and forms mutual sealing, and then the painting and corrosion prevention operation can be performed. Due to the sealing protection of the rubber gasket, the paint will not be sprayed or flowed into the zinc spraying part during painting. After the paint solidifies, the protection piece can be removed from the workpiece, thereby avoiding the pollution of the zinc spraying surface 4 of the counterbore and the inner circle position of the side wall through hole which needs to be coated with oil during painting. The installation and removal of the protection piece before painting is relatively simple and can be completed in a few seconds, thereby effectively improving the treatment of the corrosion prevention operation.

[0029] After painting is completed, the protection piece is disassembled, and the inner circle of the side wall through hole is uniformly coated with oil.

[0030] Thus, different corrosion protection treatments are completed for the same part, and the treatment quality is high and the efficiency is high. The application effectively solves the problem that different corrosion protection requirements are difficult to operate for the same part, and can accurately and quickly complete different corrosion protection treatments for the same part. The working efficiency is higher, and the application has universality. The size and positioning pin of the rubber gasket and the magnet piece can be adjusted according to the implementation requirements, and the corrosion protection treatment of the machined part is completed.

[0031] The application also protects a machining tool for corrosion protection of a machined part, which is combined with the machining tool for corrosion protection of a machined part Figure 2 , including a rubber gasket 7, a magnet piece 6, a positioning pin 8 and an M5 bolt 5, a through hole is formed in the rubber gasket 7 and the magnet piece 6, and the M5 bolt 5 is fixed on the positioning pin 8 in sequence through the through hole of the magnet piece 6 and the through hole of the rubber gasket 7.

[0032] The above-mentioned embodiments only express several embodiments of the application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A method for corrosion protection treatment of a surface of a machined part, characterized in that a counterbore is provided on a side wall through hole of the machined part, and the corrosion protection method comprises the following steps: S1: zinc spraying treatment is performed on an end surface of the counterbore after a positioning pin is inserted into the side wall through hole; S2: a rubber gasket and a magnet sheet are prepared, through holes are formed in the rubber gasket and the magnet sheet, and a bolt is fixed on the positioning pin in sequence through the through holes of the magnet sheet and the through holes of the rubber gasket to form a protection piece; S3: the positioning pin on the protection piece in the step S2 is inserted into the side wall through hole for paint spraying treatment, and when the protection piece is installed into the side wall through hole, the rubber gasket and the end surface of the counterbore are sealed to each other; S4: after the paint surface is solidified, the protection piece is removed, and oiling treatment is performed on an inner circle of the side wall through hole. The diameter of the positioning pin is the same as the diameter of the side wall through hole.

2. The method of claim 1, wherein the method is characterized by: The length of the positioning pin is 1-1.5 times of the diameter of the positioning pin, and the length of the positioning pin does not exceed the wall thickness of the workpiece.

3. The method of claim 1, wherein the method is characterized by: The size of the rubber gasket is the same as the size of the zinc spraying surface.

4. The method of claim 1, wherein the method is characterized by: The thickness of the rubber gasket is 2.8-3.2 mm.

5. The method of claim 1, wherein the method is characterized by: The thickness of the magnet sheet is 9-11 mm, and the size of the magnet sheet is smaller than the size of the rubber gasket by 2-2.5 mm.

6. The method of claim 1, wherein the method is characterized by: The thickness of the zinc spraying surface is 150-300 μm during zinc spraying treatment.

7. The method of claim 1, wherein the method is characterized by: The positioning pin is made of PVC.

8. The method of claim 1, wherein the method is characterized by: The rubber gasket, the magnet sheet, the positioning pin and the bolt are provided, through holes are formed in the rubber gasket and the magnet sheet, and the bolt is fixed on the positioning pin in sequence through the through holes of the magnet sheet and the through holes of the rubber gasket.

9. A jig for use in the method of claim 1-8, wherein ​

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