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Manufacturing process of car hood

A manufacturing process and engine cover technology, which is applied to vehicle components, upper structure, upper structure sub-assembly, etc., can solve the problems of long manufacturing cycle, low accuracy and efficiency, and numerous processes, and achieve enhanced wear resistance and durability. Corrosion, improve efficiency and accuracy, reduce the effect of production cost

Active Publication Date: 2015-09-02
ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The existing automobile hood manufacturing process has many procedures and too many open molds, resulting in the disadvantages of long manufacturing cycle and high cost;
[0004] 2. At present, most car hoods are welded by hand, and the accuracy and efficiency are relatively low;
[0005] 3. Most of the existing car hoods are sprayed with alkyd paint. This kind of car paint dries slowly, and the coating film is not easy to meet higher requirements, so it is not suitable for high-end decoration occasions;
[0006] 4. Most of the existing car hood spray paints are mostly only sprayed twice, resulting in a thinner paint layer on the car surface and poor waxing effect;
[0007] 5. Most of the existing car hood surfaces are treated with sealing glaze, the cost of sealing glaze is too high, and it needs to be sealed again every 1 year, and the cycle is too short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The process is divided into ten steps. Firstly, (1) blanking: place the plate for manufacturing the engine cover on the punching die, and punch out a suitable blank shape. The punching force is 52KN to 80KN. The outer cover and the inner The shape of the blank of the cover plate is the same; then (2) Stretch forming: place the punched blank on two sets of drawing dies, stretch and form the prototype of the outer cover plate and the inner cover plate respectively, the tensile force Take 50KN to 65KN; then carry out (3) trimming and punching: place the stretched outer cover and inner cover on the corresponding trimming and punching dies respectively, and perform trimming and punching to obtain Accurate outline dimensions, where the punching gap in the trimming punching die is 0.01mm, and the punching force is 46KN to 68KN; then (4) deburring: install the outer cover and the inner cover on the corresponding On the fixed fixture, use a grinder to remove the stamping burrs o...

Embodiment 2

[0029] Carry out embodiment 1 repeatedly by the same steps as described, the difference is: step (3) trimming and punching; the blanking gap in the trimming punching die is 0.02mm; step (5) welding; resistance spot welding Adjust the current to 75A; Step (8) Baking: Set the temperature of the oven lamp to 310°C, and take out the hood after baking for 2 hours.

Embodiment 3

[0031] Carry out embodiment 1 repeatedly by the same steps as described, the difference is: step (3) trimming and punching; the punching gap in the trimming punching die is 0.03mm; step (5) welding; resistance spot welding Adjust the current to 85A; Step (8) Baking: Set the temperature of the oven lamp to 280°C, and take out the hood after baking for 3 hours.

[0032] Test items Surface roughness μm life cycle hardness Heat resistance °C Example 1 0.8 15 months 3H 240 Example 2 0.4 24 months 5H 260 Example 3 0.8 18 months 5H 240

[0033] Through the above three embodiments, it can be known from the three sets of data in the above table that when the parameters of embodiment 2 are used, the surface roughness of the engine cover is the lowest, the service life is the longest, and the hardness and heat resistance are the highest. It is beneficial to the production and use of automobile hoods.

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PUM

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Abstract

The invention discloses a manufacturing process of a car hood, and relates to the field of car manufacturing. The manufacturing process comprises the following steps: (1) blanking, (2) stretch forming, (3) trimming and punching, (4) deburring, (5) welding, (6) grinding, (7) painting, (8) baking, (9) polishing and waxing, and (10) coating. According to the manufacturing process, an outer cover plate and an inner cover plate similar in shape are designed to use the same blanking die for blanking so as to reduce the production cost; a compound die with trimming and punching functions is adopted to reduce the steps and improve the production efficiency; a numerical control automatic resistance spot welding machine is used for welding the hood, so that the welding efficiency and accuracy are improved; an acrylic paint is used for repeatedly spraying the hood for three times, so that the paint layer has strong adhesive force and good heat resistance; the coating processing is used to improve the oxidation, high temperature and scratch resistances of the hood paint.

Description

technical field [0001] The invention belongs to the field of automobile manufacturing, and more specifically, the invention relates to a manufacturing process of an automobile engine cover. Background technique [0002] The engine cover is mostly made of rubber foam cotton and steel plate materials. When reducing engine noise, it can simultaneously isolate the heat generated by the engine during operation, effectively protect the paint on the surface of the engine cover, and prevent aging. The current car engine The cover plate manufacturing process has the following technical problems: [0003] 1. The existing automobile hood manufacturing process has many procedures and too many open molds, resulting in the disadvantages of long manufacturing cycle and high cost; [0004] 2. At present, most car hoods are welded by hand, and the accuracy and efficiency are relatively low; [0005] 3. Most of the existing car hoods are sprayed with alkyd paint. This kind of car paint dri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B62D25/10
CPCB23P15/00B62D25/105
Inventor 张余童先周章添王文深
Owner ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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