阅读说明：本技术 一种车用减震器后减工件表面处理工艺 (Surface treatment process for rear damping workpiece of vehicle shock absorber ) 是由 黄炳武 祝汝林 于 2020-04-26 设计创作，主要内容包括：本发明公开了一种车用减震器后减工件表面处理工艺,包括以下步骤：步骤1,涂漆：将减震器后减工件的贮油筒及外防尘罩表面涂漆处理；步骤2,焊接：在步骤1处理后的防尘罩上焊接吊环；步骤3,水性补漆：将吊环及防尘罩焊接部位进行水性漆喷涂处理；所述步骤1中,涂漆方法包括电泳涂漆。本发明先将减震器后减工件进行电泳喷漆处理,对于外防尘罩焊接部位及吊环等非电泳喷漆表面进行水性漆补漆工艺处理,利于简化生产线,提高安全环保水平,降低成本。(The invention discloses a surface treatment process for a rear reduction workpiece of a vehicle shock absorber, which comprises the following steps of: step 1, painting: painting the surfaces of an oil storage cylinder and an outer dust cover of a rear damping workpiece of the shock absorber; step 2, welding: welding a hanging ring on the dust cover treated in the step 1; step 3, water-based paint repair: carrying out water paint spraying treatment on the welding part of the hanging ring and the dust cover; in the step 1, the painting method includes electrocoating. The method firstly carries out electrophoretic paint spraying treatment on the rear damper workpiece of the shock absorber and carries out water-based paint repair treatment on the non-electrophoretic paint spraying surfaces such as the welding part of the outer dust cover and the hanging ring, thus being beneficial to simplifying the production line, improving the safety and environmental protection level and reducing the cost.)

1. A surface treatment process for a rear damping workpiece of a vehicle shock absorber is characterized by comprising the following steps:

step 1, painting: painting the non-welding surface of an oil storage cylinder and an outer dust cover of a rear damping workpiece of the shock absorber;

step 2, welding: welding a hanging ring on the dust cover treated in the step 1;

step 3, water-based paint repair: carrying out water paint spraying treatment on the welding part of the hanging ring and the dust cover;

in the step 1, the painting method includes electrocoating.

2. The surface treatment process for the rear shock absorber damping workpiece for the vehicle as claimed in claim 1, wherein the step 3 comprises the following steps:

step 3-1, a first pretreatment process: polishing;

step 3-2, the second pretreatment procedure: cleaning;

step 3-3, spraying water paint: spraying water paint on the surface of the pretreated workpiece in a paint spraying room;

step 3-4, surface drying treatment;

and 3-5, discharging the product.

3. The surface treatment process for the rear shock absorber workpiece of the vehicle as claimed in claim 2, wherein in step 3-1, the oil slick on the surface of the workpiece to be sprayed with the water paint and the weld oxide layer and the rust on the surface of the welding part of the dust cover are removed by polishing.

4. The surface treatment process for the rear shock absorber rear reducing workpiece of the vehicle shock absorber as claimed in claim 2, wherein in the step 3-2, cleaning and oil removing treatment is performed on the surface of the workpiece to be sprayed with the water-based paint by using a cleaning solution.

5. The surface treatment process for the rear damping workpiece of the vehicle shock absorber as claimed in claim 4, wherein in the cleaning process, the temperature of the cleaning liquid is 60-80 ℃; the cleaning liquid comprises an oil-removing cleaning agent and water.

6. The surface treatment process for the rear shock absorber workpiece of the vehicle as claimed in claim 2, wherein in the step 3-3, the water-based paint spraying thickness on the workpiece surface is more than 18 μm.

7. The surface treatment process for the rear damping workpiece of the vehicle shock absorber as claimed in claim 6, wherein in the step 3-3, the spraying thickness of the water-based paint on the workpiece surface is 30 μm to 60 μm.

8. The surface treatment process for the rear damping workpiece of the vehicle shock absorber as claimed in claim 2, wherein in the step 3-4, the surface drying temperature is 50-80 ℃ and the drying time is 20-60 min.

9. The surface treatment process for the rear damping workpiece of the shock absorber for the vehicle as claimed in claim 1, wherein the water-based paint comprises THS13-60 water-based epoxy anti-corrosion paint.

Technical Field

The invention relates to the technical field of automobile part processing, in particular to a surface treatment process for a rear damping workpiece of an automobile shock absorber.

Background

At present, the surface treatment paint spraying of the rear damping product of the shock absorber is usually carried out by adopting an epoxy paint electrostatic coating process (production line). The process flow is complex, the manufacturing cost is high, the environmental protection standard reaching difficulty is high, and the process flow cannot meet the national safety and environmental protection production requirements along with the gradual improvement of the environmental protection requirements of the country and the metropolis.

The prior paint spraying production line technology has the following defects or shortcomings:

1. the process flow is complex, and the occupied area is large: the whole production line needs 20 working procedures, the total length of the production line is about 240 meters, and the floor area is about more than 800 square meters. The production process sequentially comprises: loading, hot water washing, pre-degreasing, water washing 1, water washing 2, surface conditioning, phosphating, water washing 3, water washing 4, direct spraying water washing, automatic water blowing, a moisture drying chamber, forced cooling, automatic paint supplementing (reserving a paint supplementing station), omega electrostatic painting, leveling, paint drying, forced cooling and unloading.

2. The requirements for environmental protection and three-waste treatment are high: firstly, banana oil and Tianna oil are used as diluents in the epoxy paint, and the epoxy paint contains a large amount of harmful substances such as heavy metals including benzene and xylene and carcinogenic substances harmful to human bodies; the benzene compound is volatilized from the paint, has strong pungent smell, and has the sustained and long-acting volatilization of harmful substances, so that the product is easy to discolor and has poor durability. Secondly, the wastewater generated in the pre-treatment and paint spraying production processes is sent to a sewage treatment station for centralized treatment through a paint-containing wastewater and acid-base wastewater sewage discharge pipeline and then is discharged after reaching the standard. Finally, the spray paint waste gas is processed by adopting a water curtain purification, activated carbon adsorption (desorption) and catalytic combustion mode, and then reaches the standard, and is dried and subjected to catalytic combustion treatment, and then reaches the standard before being discharged.

3. The paint is flammable and explosive, and has high safety production standard requirements.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the surface treatment process for the rear shock absorber workpiece solves the problems, firstly, the rear shock absorber workpiece is subjected to electrophoretic paint spraying treatment, and the non-electrophoretic paint-coating surfaces of the welding part (about 15mm wide) of the outer dust cover and the lifting ring and the like are subjected to water-based paint supplementing treatment, so that the production line is simplified, the safety and environmental protection level is improved, and the cost is reduced.

The invention is realized by the following technical scheme:

a surface treatment process for a rear damping workpiece of a vehicle shock absorber comprises the following steps:

step 1, painting: painting the non-welding surface of an oil storage cylinder and an outer dust cover of a rear damping workpiece of the shock absorber;

step 2, welding: welding a hanging ring on the dust cover treated in the step 1;

step 3, water-based paint repair: carrying out water paint spraying treatment on the welding part of the hanging ring and the dust cover;

in step 1, the painting method includes, but is not limited to, electrophoretic painting.

The invention adjusts the original whole epoxy resin paint spraying process into an electrophoresis paint spraying process and a water paint replenishing process, finishes the sealing of the double-suspension-ring shock absorber (rear damper), adopts the water paint replenishing spraying on the two parts except the welding part (about 15mm wide) of the outer dust cover and the upper connecting ring, and finishes the surface treatment on the other parts (about 95 percent of the whole surface area of the rear damper workpiece) by adopting the electrophoresis paint spraying. Specifically, after a part, about 15mm wide, of the welding part of the dust cover is removed, is shielded by a special shielding tool during electrophoresis surface treatment, electrophoresis is carried out on the electrophoresis paint spraying production line, and only the welding part of the dust cover and the lifting ring are subjected to water-based paint repair so as to reduce the spraying area of the water-based paint, thereby ensuring that the process simultaneously meets the aims of safety, environmental protection, saving and cost reduction.

Further, the step 3 comprises the following steps:

step 3-1, a first pretreatment process: polishing;

step 3-2, the second pretreatment procedure: cleaning;

step 3-3, spraying water paint: spraying water paint on the surface of the pretreated workpiece in a paint spraying room;

step 3-4, surface drying treatment;

and 3-5, discharging the product.

Further, in the step 3-1, floating oil on the surface of the workpiece to be sprayed with the water-based paint and a welding oxide layer and floating rust on the surface of the welding part of the dust cover are removed through polishing.

Further, in the step 3-2, cleaning and degreasing treatment is carried out on the surface of the workpiece to be sprayed with the water-based paint by using a cleaning solution.

Further, in the cleaning process, the temperature of the cleaning liquid is 60-80 ℃; the cleaning liquid comprises an oil-removing cleaning agent and water.

Further, in the step 3-3, the spraying thickness of the water-based paint on the surface of the workpiece is more than 18 μm.

Further, in the step 3-3, the spraying thickness of the water-based paint on the surface of the workpiece is 30-60 microns.

Further, in the step 3-4, the surface drying temperature is 50-80 ℃, and the drying time is 20-60 min.

Further, the water-based paint comprises THS13-60 water-based epoxy anticorrosive paint.

The invention has the following advantages and beneficial effects:

1. improves and promotes the spraying process flow by combining the performance and the characteristics of the novel environment-friendly water-based paint, simplifies the layout of the production line and occupies the area

The 20 procedures of the original production line for completing the product paint spraying and the integral paint spraying are improved into two spraying processes, and the electrophoretic spraying and the water-based paint spraying are adopted for repairing the paint, so that the new process paint spraying process is adjusted to the X procedures; particularly, for the water paint repair process, the process can be completed by 4 devices and 7 procedures, thereby greatly simplifying the paint spraying process, saving the occupied area, and saving the devices, the manpower and the operation cost.

Specifically, the method is used for the paint repair production of non-electrophoretic paint spraying surfaces such as a welding part (about 15mm wide) of the outer dust cover and the hanging ring after the sealing of a double-hanging ring shock absorber (rear suspension) product is finished, the outer dust cover and the upper hanging ring are assembled in place and welded; except the part needing paint repair, other parts such as the outer dust cover, the oil storage cylinder and the like are subjected to electrophoretic spraying before welding, so that the purposes of safety, environmental protection, zero emission standard of toxic and harmful substances, saving and cost reduction are achieved.

2. Do benefit to and solve whole electrostatic painting environmental protection pressure of reaching standard big problem, promote safe production level

The invention adopts the environment-friendly water-based paint to replace part of the original common paint, reduces the using amount of the common paint and is beneficial to environment-friendly production. The invention can adopt the industrial anti-corrosion environment-friendly paint newly developed by advanced water-based technology, takes water as a diluent, and is suitable for the protective finishing of automobile parts and the like. The main characteristics are as follows: (1) the water is used as a diluent, so that the fuel is not combusted, has no fire hazard and explosion hazard, and is beneficial to safe production, storage and transportation. (2) Low VOC, no harmful substances such as benzene, formaldehyde, heavy metal and the like, meets the requirement of environmental protection and is harmless to human health. (3) The paint film has high hardness, excellent adhesive force, water resistance and corrosion resistance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic cross-sectional structural view of a paint patch according to the present invention;

FIG. 2 is a diagram of the effect of the rear damping workpiece of the shock absorber before water-based paint repair of the present invention;

FIG. 3 is a diagram illustrating the effect of the rear damping workpiece of the shock absorber after the water-based paint is repainted.

Reference numbers and corresponding part names in the drawings: a1-water paint repair part (upper connecting ring and welding part with dust cover), A2-electrophoresis paint spraying part (lower connecting ring connected with oil storage cylinder), B-electrophoresis paint spraying part (oil storage cylinder).

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.