Watch Case Back MIM Parts
Features: Due to the addition of Mo, its corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and can be used under harsh conditions; excellent work hardening (non-magnetic); excellent high temperature strength; non-magnetic in solid solution state; cold The appearance of rolled products has good gloss and is beautiful; compared with 304 stainless steel, the price is higher.
Product Introduction
Watch case back MIM Parts | |||||||||
Item | Material | Production Process | Sintering Temperature | Mold | Custom | ||||
Watch case back | 316 | Metal Injection Molding | 1350°C-1500°C | To be customized | Yes | ||||
Chemical Composition | C ：≤0.08 | ||||||||
Available Materials | Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) | ||||||||
Finish | Dimensional Accuracy | Product Density | Appearance Treatment | Appropriate Weight | |||||
Roughness 1～5μm | （±0.1%～±0.5%） | 92～95% | Mirror Reflection | 0.03g～400g） | |||||
Product performance | Product performance | ||||||||
Waterproof analysis of watch bottom cover style
There is an unavoidable problem with our daily watch, which is the waterproof problem of the watch. Even if we don’t wear the watch into the water, there will be a problem of washing hands and face, which makes the watch come into contact with water. Generally, if we wear a watch that is basically not a diving watch, we usually wear the watch. Take it off and wash it again. After all, if it gets into the water, it is very troublesome. So what kind of watch structure has a better waterproof effect?
When we buy a watch, we usually see the waterproof level mark on the watch. The most marked waterproof level on the market is 30 meters waterproof, but if you mark 30 meters, don’t really think that you can dive 30 meters deep with a watch. The concept It is completely different. The 30-meter waterproof is also called life waterproof. It is okay to wash your face with your hands.
【How is the watch waterproof? 】
First of all, we need to see where the water enters the watch. I try to keep it as simple as possible. Usually, the steel case of a watch is divided into two or three layers. The two layers are the combination of the case and the back cover. The main shell is detachable), generally speaking, the waterproof of the two-layer shell is safer than the three-layer shell, because after all, one layer of structure is missing, and there is one less place for water to enter, so if you only follow the waterproof one It is said that the waterproof effect of the two-layer case is usually better, so the most commonly used diving watch is the two-layer case. Many people may say that the diving watch has three layers. In fact, the watch case back on the top of the diving watch can be rotated. MIM Parts are installed externally, and the internal structure is basically two layers.
【Diving watch】
Let's talk about the diving watch first. After the two-layer structure of the diving watch comes out, there are usually only three separable gaps. Generally, the back cover of the diving watch is not transparent, and the gap on the back is the back cover and the case. The connection, the front gap is the connection between the glass and the case, and the side gap is the connection between the handle and the case. According to the mechanical structure, the less the connection gap, the easier it is to control the waterproof effect.
【Non-diving watch】
Relatively speaking, there are more joints for formal wear or casual watches. First of all, many formal watches need to be made of three-layer cases, because the proportion of the dial of the formal watch is larger, and many need to install the dial into the case from above. The back cover of a formal watch is more of a transparent back cover, so an extra glass and a handle are added to the back cover, so that many formal or casual watches have five joints. However, if the formal watch also uses the upper and middle shells as one, and the back cover is not transparent, then the joints can be reduced to three.
【Waterproof structure】
So why can a diving watch be carried into the water but not a formal watch? First of all, what is waterproof? It is nothing more than two things, one is a waterproof rubber ring, and the other is a Teflon ring. Teflon is a relatively hard material, and it is usually used at the joint between the glass and the steel shell. Force to achieve waterproof effect. The waterproof apron is usually used at the connection between the back cover and the case, and the connection between the handle and the case is also a waterproof apron, which is relatively soft and elastic.
Whether it is a diving watch or a formal watch, the structure is basically similar except for the head. It is waterproof by extruding Teflon and waterproof rubber rings. The difference lies in the handle on the side of the watch. , The diving watch generally uses a lock handle, that is, the screw head, which is locked by screwing in to achieve a perfect airtightness. Most formal watches do not use this structure, so compared to waterproof, the handle on the side of the formal watch is a dead end. Although the formal watch also uses a waterproof rubber ring on this structure, it is not as good as the diving watch after all. The lock handle is tight.
In addition, because the diving watch is thicker and the formal watch is more delicate, the tightness of the structure of the diving watch at the junction is much higher than that of the formal watch.
【The waterproof effect of screw-in bottom cover and screw bottom cover is better】
In a previous post, a watch friend talked about the screw-in bottom cover and the screw bottom cover, so this time I will focus on the waterproof effect of these two structures. Watches with good waterproof effects usually use screw-in type heads. Not much to say about this point, the difference is that some watch case back covers are screwed in, and some are screwed in, so which of these two Watch case back MIM Parts is better?
I guess most people think that the screw-in bottom cover is more waterproof. Not only ordinary players think so, but also many people who have just entered the industry think so. In fact, this is not the case. If you really want to compete, tighten the screws. The waterproof effect of the structure can be higher. Let's analyze the pros and cons of the two structures separately.
【Analysis of screw-in bottom cover】
First of all, this connection method is very reasonable. The screw-in connection method can be reinforced very tightly, and the airtightness is very high after the waterproof rubber ring is added inside. This structure is like the bottle cap of a beverage bottle. Even if the bottle of beverage is dropped hard on the ground, water will not leak at the mouth of the bottle, and it is more likely that the bottle body will be broken. So what are the disadvantages of this structure? The disadvantage lies in the reinforcement of the waterproof ring. First of all, the texture of the waterproof apron itself is relatively soft. The friction generated during the tightening process of the screw-in reinforcement method may cause the deformation of the waterproof apron, which is one of them. The second is because of machining tolerances, because the screw-in bottom cover is screwed in, there is such a small chance that it will cause a slight deviation in the fit between the bottom cover and the case, which also affects waterproofing A little bit of intensity. Of course, this effect is not too great for ordinary diving watches with a depth of several hundred meters. For diving watches with a depth of more than 1000 meters, you must pay attention to it. Therefore, if diving watches with a depth of more than 1000 meters use this structure The technical requirements are quite high.
Diving ball
【Analysis of Screw Reinforced Bottom Cover】
The first thing to correct is the rumor that the waterproof effect of the screw bottom cover is not as good as that of the screw-in bottom cover. Then let’s look at the principle of waterproofing the back cover. In fact, to make the back cover waterproof is to make the back cover as close as possible. To the case, let the waterproof rubber ring in the middle be squeezed more evenly to achieve the degree of sealing. The screw back cover definitely does not need to be rotated. It is necessary to firmly attach the Watch case back MIM Parts to the case and then reinforce it with screws one by one. This method ensures that the waterproof rubber ring will not be deformed by friction due to the force brought by the rotation. Generally, if the diving watch needs to be reinforced with screws, it needs more than six screws, so the degree of tightness brought about by the simultaneous reinforcement of these six directions is also more reliable than the screw-in bottom cover, and this structure can also be reduced as much as possible. Negative effects of tolerance. For example, if the position tolerance is relatively large, and there seems to be a small gap, then a single screw can be screwed in here to cover the gap tightly. Just like the deep sea diving ball in the picture.
However, not all screw bottom covers are more waterproof than the screw-in type. The screw structure that most often appears on formal watches cannot actually be classified here. The screw structure used in formal watches is more for the rear The pattern or lettering on the cover can face a certain direction.
Personally, I think that the best screw-reinforced waterproof structure should be Audemars Piguet. This is also a screw structure. It is a way of tightening the upper and lower two mother-in-law screws in the middle, and it also avoids the problem of slippery wires caused by soft 316L steel. , This structure seems to be borrowed from the structure of the deep-sea diving ball.
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