Friends who have made equipment casings have encountered similar problems: the drawings are drawn beautifully, but the sheet metal factory produces a size difference of 2 millimeters, and the screw holes do not match; The spraying color was selected correctly, but the adhesion was not good, and the paint started to peel off after two months of use; We agreed to deliver within two weeks, but it has been delayed for a month and still hasn't come out.
If you also have these headaches, this article is worth spending 3 minutes reading. I will tell you directly——Sheet metal bending, spraying, drawing, and oxidation are all completed in one factory. What pitfalls can be avoided and how do we achieve them.
Summary in one sentence: Stainless steel/aluminum shell customization,sheetmetalbending/CNCmachining,spraying/drawing/anodizing, starting from 1 piece, free rework for dimensions that are not up to standard
Have you encountered any difficulties in processing these shells?
Any of the following indicates that your previous supplier had a problem at some point:
The size doesn't match
The bending angle is offset by half a degree, causing overall deformation after welding, and the screw holes are misaligned during assembly. The reason is often inaccurate calculation or failure to confirm the first piece during bending.
Spray paint off/color difference
Gently pick with your nails and the pieces will fall off, or several units in the same batch may have different colors. The problem lies in inadequate pre-processing or failure to control the film thickness and hanging angle during spraying.
There are flaws in the appearance.
The drawing has stripes, uneven oxidation color, and burrs on the edges and corners. These are not trivial matters that just don't affect the use - the instrument is placed in the exhibition hall or laboratory, and the texture of the shell directly determines the customer's first impression of your product.
The delivery date has been postponed again and again.
We agreed to change from two weeks to one month, and every time we ask, we say 'it's almost done'. Many times, due to bending, spraying, and oxidation, different factories are found, and one link gets stuck, causing the entire line to be paralyzed.
If you have not encountered any of the above situations, congratulations, you have chosen a good supplier. If you have passed 1-2 points, the following section may be useful to you.
The types of stainless steel/aluminum shells we can make
Our process covers two mainstream paths, and you can match them according to product requirements:
Sheet metal bending shell (suitable for small and medium-sized batches, complex structures)
Materials: Stainless steel SUS304/316, aluminum plate 5052/6061, cold-rolled plate SPCC, galvanized plate SECC
Process: Laser cutting (± 0.1mm) → CNC bending (± 0.5 °, maximum 3.2 meters) → Welding/riveting → Surface treatment
Applicable: Instrument and meter casings, industrial control boxes, power supply cabinets, non-standard equipment casings
Aluminum extruded shell (suitable for long strips, large quantities, high heat dissipation requirements)
Material: 6063-T5 (smooth surface, good extrusion)
Process: Mold making (2-3 weeks) → Extrusion → Cutting → CNC post-processing → Surface treatment
Applicable: Projector heat dissipation profiles, LED lamp bodies, equipment rail housings, handheld instruments
We do both processes, so customers don't have to find two separate factories.
The final texture of the shell depends 70% on surface treatment. We do not subcontract, all routine processing is completed in our own factory.
Spray coating (powder coating/liquid baking paint) - most commonly used
Pre treatment: degreasing → water washing → silane/phosphating (for iron parts) or chroming (for aluminum parts) - this step is omitted, and adhesion may have problems
Coating thickness: powder 60-120 μ m/liquid 30-50 μ m
Color: RAL color card full series Pantone、 Customization based on provided samples
Texture: Sand pattern/Flat/High gloss/Orange pattern/Hammer pattern
Testing: Hundred grid test (adhesion level 0)+film thickness gauge sampling+salt spray test (as needed)
Wire drawing treatment (stainless steel/aluminum panel)
Number of Contents: 240 # -600 # Optional
Effect: Straight Thread/Stray Thread/Snowflake Thread
Applicable: Instrument front panel, decorative strip, nameplate
Color: Natural/Black/Gold/Other Customized Colors
Film thickness: 10-25 μ m (ordinary)/30-50 μ m (hard oxidation)
Applicable: Aluminum extruded shell, aluminum bent shell
Electroplating (stainless steel/iron parts)
Chrome plating (bright/matte), nickel plating, titanium plating (titanium gold/rose gold/black titanium)
Screen printing/laser marking
Logo、 Model, interface identification, scale line
How to ensure quality? We use detection to speak
Many sheet metal factories say 'our quality is good' but cannot provide reports. Our approach is:
Each shipment can be accompanied by a size inspection report and film thickness report. When requested by the customer, a hundred grid and salt spray report can be provided.
What are the differences between us and other sheet metal factories?
Customers who have approached us before and after in the market often choose to cooperate because of one of these reasons:
1. Starting from 1 piece, the sample fee can be deducted from the bulk order
Small batch verification, prototype, prototype shell - no need to gather quantity, even one piece can be made. After confirming the bulk order, the sampling fee will be fully refunded.
2. Complete the entire process by yourself without subcontracting
Bending, welding, spraying, oxidation, wire drawing, silk screen printing - try to do as much as possible by yourself. The responsibility for the problem is clear, and we do not need you to help us determine whether it is a problem with the processing plant or the processing plant.
3. Unqualified size, free remake
The commitment written in the contract. It's not a slogan, it's a bottom line.
4. 24-hour quotation, non-standard drawings can also be evaluated
Send the picture and reply with the feasibility of the process and quotation within 24 hours. Incomplete drawings? Send reference photos and dimensions, and the engineer will help you come up with a solution.
Our equipment has been used in these industries before
Collaboration Process (Five Steps, Very Simple)
Send pictures/requirements → CAD/PDF/STEP, or refer to photos+size description
Evaluation within 24 hours → Process suggestion+quotation+delivery time
Confirm sampling → 3-7 days for sample (sheet metal), 2-3 weeks for extrusion and mold opening
Sample confirmation → Sign mass production contract after qualification
Batch production+shipment → Comes with inspection report, packaged and shipped
Next, you can do it this way
Do you have drawings?
Send to [email protected] Or WeChat/WhatsApp+86 17702667581, reply with quotation within 24 hours
Haven't you finished drawing yet?
Describe your usage scenario (product type, approximate size, material requirements, batch size, appearance requirements), and have engineers assist in developing a solution
Do you want to see strength?
Video link to watch production lines - laser cutting, bending, spraying lines, quality inspection areas, wherever you want to see
Regarding the sample
We can send material samples, spray color cards, and brushed/oxidized samples for confirmation
We promise that if the size or appearance does not meet the agreed standards, we will redo it free of charge. Don't shift the blame, don't procrastinate.
*Stainless steel/aluminum shell customization | Sheet metal bending/aluminum extrusion | Spraying/drawing/oxidation/electroplating | 1 piece minimum | Unified quality inspection of the entire process*
Copyright © 2024 by Xiamen Tongchengjianhui Industry & Trade Co., Ltd. - Privacy policy
