CN114433455B

CN114433455B - Antifog spraying method for Y-type vehicle lamp lens

Info

Publication number: CN114433455B
Application number: CN202111636193.6A
Authority: CN
Inventors: 陈姗姗; 伍琼姣; 李冬林; 雷飚
Original assignee: Hubei Xiaogan Huazhong Lamp Co ltd
Current assignee: Hubei Xiaogan Huazhong Lamp Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-09-20
Anticipated expiration: 2041-12-29
Also published as: CN114433455A

Abstract

The invention relates to an antifog spraying method for a Y-type vehicle lamp lens, which improves the original spraying tool and process in a series, enlarges the opening of a resin base, adjusts the spraying posture of the lens, optimizes the spraying path, changes the spraying time, shortens the distance of a spray gun and the like. The improved anti-fog paint spraying process thoroughly solves the problem of spraying quality of Y-type vehicle lamp lens products, greatly reduces the reject ratio, improves the economic benefit of enterprises, and provides experience and reference for subsequent research and development of lamps with larger depth-to-width ratio by companies.

Description

Antifog spraying method for Y-type vehicle lamp lens

Technical Field

The invention relates to the technical field of automobile lighting, in particular to an antifogging spraying method for a Y-type vehicle lamp lens.

Background

I have previously designed a combined headlamp (refer to Chinese patent CN213237376U) specifically for a certain host factory, and the lens structure of the combined headlamp is shown in FIG. 1. The lens is of a special-shaped structure (Y-shaped), three edges of the Y-shaped lens protrude outwards to a certain extent to form a specific appearance and a specific shape, wherein the maximum depth of the three edges is 55mm, the maximum width of the three edges is 28mm, and the depth-width ratio is up to 1.96. In order to ensure the lighting effect and deal with various rain and fog environments, the inner surface of the lens needs to be sprayed with antifogging paint before assembly. The original tool for spraying is shown in fig. 2, and includes a stainless steel base and a resin base fixed inside the stainless steel base. The shape of the resin base is the same as that of the lens, the lens is placed on the resin base during spraying, and the spray gun penetrates through the resin base and then sprays according to a set path.

Because the width and the depth of the lens are narrow and deep, the base of the spraying tool used in the early-stage trial production is thick, the mouth part is small, and the resin base is vertically connected with the stainless steel base, so that the conditions that the shaft joint of the mechanical arm cannot be adjusted when moving to the limit and cannot enter the inside of the lens often occur, the side surface and the corner part of the lens become spraying dead corners, and the antifogging paint cannot be sprayed (as shown in figure 3). In addition, the original automatic spray path is shown in fig. 4: the starting point is vertex a, the end point is vertex C, the spraying is performed in the order of point a → point O → point B → point O → point C, the robot gun is closed (shown by the broken line) from the point B → point O, and the nozzle is opened (shown by the solid line) at the remaining stages for normal spraying. Due to the fact that the structural design of the spraying tool is not reasonable enough, in addition, the spraying process needs to be improved, serious orange peels and flow marks appear on the surface of the lens during test production, the thickness and uniformity of the film layer cannot meet the design requirements, and finally the yield of the whole anti-fog spraying workshop section is lower than 50%.

Disclosure of Invention

The invention aims to provide an antifogging spraying method for a Y-type vehicle lamp lens, which comprises the following steps: firstly, a spraying tool is reformed, then a Y-type vehicle lamp lens to be sprayed is placed on the reformed spraying tool, and finally, a manipulator spray gun is started and spraying is carried out according to a new spraying path.

Furthermore, three sides of the Y-type vehicle light distribution lens are in a shape of a Chinese character ji with certain depth and span, and the aspect ratio of each side is not more than 2, preferably 1.5-2.

Further, the spraying frock after transforming still includes metal base and resin base, the resin base is fixed inside the metal base, and the opening of resin base increases gradually from inside to outside, and Y type vehicle light lens lay on the resin base after with the plane of spraying frock certain angle. The improvement point of spraying frock mainly has two places: firstly, the opening of the resin base is designed into a slope surface/inclined surface or a funnel shape, so that a manipulator can conveniently enter the interior of the lens without touching the corner of the spraying tool; and secondly, the original horizontal spraying posture of the lens is adjusted to be inclined at a certain angle, so that the gun head can be completely penetrated into the lens when the manipulator sprays.

Furthermore, the lens is arranged on the resin base and forms an included angle of 45 degrees with the plane where the spraying tool is located.

Further, the new spraying path is specifically as follows: spraying the spray gun to the vertex A of one of the edges from the point O by taking the central point O of the Y shape as a spraying starting point, stopping spraying and returning to the central point O; continuing spraying from the central point O to the vertex B of the second side, and returning to the central point O after stopping spraying; and finally, continuously spraying the coating from the central point O to the top point C of the third edge, stopping spraying and returning to the central point O, thereby finishing the antifogging coating spraying operation of the whole lens.

Further, after the spray gun is started each time and moves to a distance away from the central point O, spraying is started. The investigation found that the defective products with the excessive thickness of the paint layer in the prior art are mainly concentrated at the central point, because the central point of any spraying path is sprayed at least 2 times. Therefore, the new process tries to delay the initial spraying time of the spraying, and starts to spray after the spray gun moves for a certain distance from the central point to the vertex A, the vertex B or the vertex C, so that the central point part can be effectively prevented from being repeatedly sprayed for many times.

Furthermore, the distance between the actual starting point of the spray gun and the center point O is controlled to be 25-35mm, preferably 30 mm. The distance is the result of repeated experiments of the inventor, when the distance is too large, the central point is easy to miss spraying, and when the distance is too small, the problem that the paint surface is too thick due to repeated spraying cannot be solved.

Further, the distance between the spray gun and the Y-type vehicle lamp lens is controlled within 12-16cm, preferably 12cm, during the spraying process. The spraying distance between the spray gun and the Y-shaped vehicle lamp lens is 16-18cm, and later, the distance is found to be not suitable after a spraying tool and a spraying path are improved, so that the problems of thin paint surface, low efficiency and the like exist.

Through repeated and continuous tests and analysis summary, I have made a series of improvements on the original whole spraying process and equipment and succeeded. Compared with the prior art, the invention has the beneficial effects of: (1) the method for improving the anti-fog paint spraying process of the Y-type vehicle light distribution lens product is characterized in that the problems existing in the anti-fog paint spraying process of the Y-type vehicle light distribution lens product are deeply analyzed, improvement is made in a targeted manner from multiple aspects such as a spraying tool, a spraying path, a spraying opportunity, a spraying distance and the like, the improvement points are not known before, and the concept that most research and development engineers preferentially improve from the aspects of an anti-fog paint formula or spraying equipment and the like is completely different; (2) compared with the problems of long research and development period, high cost, uncontrollable risk and the like existing in other improvement directions, the invention better solves the problem of spraying quality of Y-type vehicle lamp lens products with relatively low cost, greatly reduces the yield of defective products and improves the economic benefits of enterprises; (3) the anti-fog spraying process problem of the Y-type vehicle lamp lens is thoroughly solved, a standard spraying method is established, and experience is provided for subsequent companies to research and develop lamps with larger depth-width ratio.

Drawings

FIG. 1 is a perspective view of a Y-lens;

FIG. 2 is a photograph of an old spray tool;

FIG. 3 is a schematic view of a spraying dead angle of an old spraying process;

FIG. 4 is a schematic diagram of an old spray path;

FIG. 5 is a photograph of a modified spray coating tool;

FIG. 6 is a top view of the improved spray tool;

FIG. 7 is a schematic structural view of a Y-type lens;

FIG. 8 is a sectional view taken along line A-A of FIG. 7;

FIG. 9 is a sectional view taken along line B-B of FIG. 7;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 7;

FIG. 11 is a cross-sectional view taken along line D-D of FIG. 7;

fig. 12 is a schematic view of a new spray path.

Detailed Description

In order to make those skilled in the art fully understand the technical solutions and advantages of the present invention, the following description is further provided with reference to the specific embodiments and the accompanying drawings.

The object to be sprayed is a Y-shaped lens as shown in figure 1 or 7 and is formed by injection molding of transparent plastic. The lens has 3 lamp cavities with depth, width and length for holding light source and other parts. In order to ensure the using effect of customers, the inner wall of the lens is also required to be sprayed with a layer of antifogging paint.

Before the prior art, the spraying tool shown in fig. 2 is adopted, and spraying is carried out according to the spraying path shown in fig. 4, but the side face or the corner of the product is always not sprayed or the spraying quality is poor, so that the yield is low.

Through repeated test adjustment, firstly, a spraying tool is improved, and firstly, an opening of a resin base is enlarged to be horn-shaped; secondly, the position relation between the metal base and the resin base is adjusted, and the original horizontal placing posture of the lens is adjusted to be inclined at an angle of 45 degrees; thirdly, the spraying path is changed, and spraying is carried out along the sequence of the point O → the point A → the point O → the point B → the point O → the point C; fourthly, strictly controlling the spraying time, starting from the point O for a short distance (30mm), and then starting a spray gun to spray; fifthly, the distance (12cm) between the spray gun and the Y-shaped vehicle lamp lens is shortened. Through the improvement measures, the common quality problems of less spraying, more spraying, sagging and the like of the lens in the process of spraying the antifogging paint are thoroughly avoided, and the yield is improved to more than 95%. In the process, important and key equipment and raw materials such as the original spraying robot, the antifogging paint formula and the like are not changed, and the improvement is in scattered or even tiny places, so that the unobtrusive improvement really improves the economic benefit of enterprises.

Claims

1. An antifog spraying method for a Y-type vehicle lamp lens is characterized by comprising the following steps:

firstly, a spraying tool is reformed, the reformed spraying tool comprises a metal base and a resin base, the resin base is fixed in the metal base, an opening of the resin base is gradually enlarged from inside to outside, and a Y-type vehicle lamp lens is placed on the resin base and forms an included angle of 45 degrees with a plane where the spraying tool is located;

then placing the Y-shaped vehicle lamp lens to be sprayed on the modified spraying tool;

and finally, starting a spray gun of the manipulator and spraying according to a new spraying path, wherein the new spraying path specifically comprises the following steps: spraying the spray gun to the vertex A of one of the edges from the point O by taking the central point O of the Y shape as a spraying starting point, stopping spraying and returning to the central point O; then continuously spraying to the top point B of the second edge from the central point O, stopping spraying and returning to the central point O; finally, continuously spraying the coating to the top point C of the third edge from the central point O, stopping spraying and returning to the central point O, thereby finishing the antifogging coating spraying operation of the whole lens; after each start, the spray gun moves to a position far away from the central point O25-35 mm and then starts spraying, and the distance between the spray gun and the Y-type vehicle lamp lens is controlled to be 12-16cm in the spraying process;

three sides of the Y-type vehicle lamp lens are in a shape like a Chinese character ji with certain depth and span, and the depth-to-width ratio of each side is not more than 2.