【124】20-year Mold Team: Those Who "Can Spot the Problem at a Glance"

【124】20-year Mold Team: Those Who "Can Spot the Problem at a Glance"

Last month, a company in Dongguan that produces smart locks brought in a new product drawing and said they had received quotations from four mold factories. Three of them claimed they could make it, and one said it would be easier if it was modified. The client was unsure and wanted to hear our opinions.

The person in charge of the reception was our mold design department's veteran Liu. He has been working in this industry for a full 23 years. After looking at the drawings for less than three minutes, he pointed out two issues: First, the thinnest part of the product is 0.6 millimeters, but it is farthest from the gate. When the molten material reaches it, the temperature will drop by at least 15 degrees, and the filling pressure requirement is very high. Ordinary injection molding machines cannot fill it completely. Second, there is a hook structure inside, and the ejection direction is inconsistent with the main body. A slider needs to be made, but the movement space of the slider is blocked by another structure. If forced to do it, the strength of the mold will be affected.

The customer was completely stunned by this, because this was precisely the problem that none of the four mold factories they had previously contacted had identified - the three that said "we can do it" simply didn't notice anything; the one that said "make some modifications" only vaguely mentioned that "the structure is a bit complex", failing to specify exactly where the problem lay.

This is the value of 20 years of experience. It's not about being able to draw diagrams or use software. Rather, it's about being able to glance at a drawing and mentally visualize the entire process of how this product is produced from the injection machine: how the melt flows, how it cools and shrinks, how it is ejected and deformed, and how it is assembled and subjected to forces. This "movie-making" ability cannot be achieved through software, nor can it be taught by books. It can only be accumulated through one-by-one failed cases.

When Old Liu first started his career, he also made mistakes. It was in 2003. He designed his first mold independently and felt very confident. However, when he put it into production, the product stuck to the core and wouldn't come off. He spent two days troubleshooting and finally disassembled and reassembled the mold. The company lost eight thousand yuan as a result. This lesson taught him that mold design is not just about drawing diagrams; it's about predicting the future. Problems you can't predict will all turn into accidents at the production site.

Now, in the team led by Old Liu, the shortest member has been working for eight years. They have a habit: when they receive new drawings, they don't turn on the computer immediately. Instead, they gather around to "discuss the drawings". Each person shares their experience and points out possible problems. You say yours, I say mine, and list out the potential pitfalls first. Then, they discuss how to avoid them one by one. This process takes half a day for the shortest members, and up to two days for the longest ones. Some clients don't understand: "Why haven't you started working yet? Other companies have the drawings ready the same day." Our response is: The person who can draw the fastest is often the one who spends the longest time on model repair.

Last year, a set of mold for the antenna cover of a communication base station was made for Huawei. It was during this "discussing the drawings" process that it was saved. The product was very large, nearly one meter long, with a wall thickness of only 1.2 millimeters. According to conventional design, reinforcing ribs would definitely be added to prevent deformation. But during the "discussing the drawings" session, an engineer proposed: If we add reinforcing ribs, will it affect the antenna signal? As soon as this question was raised, everyone was stunned. After researching and conducting simulations, it turned out that the metal material of the mold steel would interfere with the signal at specific frequencies. Finally, we changed the plan and used a variable cross-section structure instead of reinforcing ribs, which not only ensured the rigidity but also solved the signal problem. Later, the structural engineer of Huawei specially called to express gratitude: "We didn't consider this problem internally. You guys solved it for us like saving a bomb."

This is the true value of the 20-year mold team. They not only know how to do it, but also know what not to do; not only do they solve your current problems, but also foresee the troubles you will encounter tomorrow. When you hand over the drawings to them, what you receive is not a mold, but a group of people who are concerned about your product.

Handing over the drawings to Golden Eagle is equivalent to handing over the future to a group of people who have been working hard for two decades.