Clogging of bolt holes and drainage holes is an important issue that can lead to both assembly defects and the recurrence of rust.
Filling holes is a defect where bolt holes, positioning holes, drainage holes, etc., are blocked by paint. This issue is discovered at the customer site when bolts cannot pass through, parts do not fit into jigs, or water cannot drain. Particularly, if just one drainage hole is blocked, moisture can remain inside, leading to rust reoccurrence or blistering. The causes include excessive film thickness, spray direction, part orientation, jig setup, and paint pooling before drying. Initially, we check the position of functional holes, the extent of blockage, surrounding drips, and reproducibility with the same parts. The countermeasures involve identifying functional holes on the drawings and confirming them at three stages: before painting, after painting, and before shipping. Since drips and thick films are likely to occur around the holes, we confirm the passage not only visually but also using pins or gauges as necessary. It is important to make functional holes a dedicated focus for verification. Please utilize painting management documents for confirmation. Holes are parts that are directly related to functionality rather than appearance. Creating an important hole list and making it an independent inspection item will help prevent recurrence.
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basic information
Measures for hole filling, functional hole management, bolt holes, drainage holes, film thickness management, metal coating.
Price range
Delivery Time
Applications/Examples of results
Improvement of hole filling for automotive parts, construction hardware, industrial machinery, and metal products, as well as functional hole management.
Company information
We are not just a "subcontracted painting factory." Established in 1958, our company has a foundation of painting technology and also specializes in chemical treatment, stripping, and cleaning, functioning as the "external surface treatment department" in your organizational chart. Based on our philosophy of "preparation is eight-tenths of the work," we emphasize participation from the "upstream process" before the drawings are finalized. We conduct test painting on a wide range of metals and difficult materials, and we produce the entire process from assembly, packaging, to delivery, thereby reducing your management workload. Additionally, by being able to perform zinc phosphate treatment in-house, we achieve stable painting quality. Furthermore, our micro-heating stripping technology, which does not use chemicals, maintains the electrical state of the "jigs (hangers)" that influence painting quality. Our approach of "pre-treatment determines painting quality" ensures the stability of the paint film during mass production. Rather than simply "applying specified standards," we work backwards to achieve optimal painting specifications and prevent scratches during transportation, sparing no effort in thorough discussions from the outset. This diligent preparation is the shortest path to preventing rework and minimizing total costs. From the development stage, please utilize the expertise of our specialists as part of your production line.
