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Continue to find the series on Baidu, the injection molding machine repetition accuracy standard that cannot be found in Baidu, this standard Where did you go?
Hello everyone, today I still can’t find the series on Baidu. I can’t find the series on Baidu. I have talked about several injection molding knowledge and concepts that I have proposed that Baidu cannot find. The previous few issues talked about 1. "Injection Molding and Glue Squeezing" 2. "Shrinking Migration" 3. "Convergence Bonding Line", and 4. "Allowable Water Content, Activity of Water Molecules and Solubility of Water".
What are you talking about today? Let me talk about 5. "Repeatability of Injection Molding Machine", or the standard for weight repetition accuracy of plastic products. After talking about this question, I will make up five series of things that I can’t find on Baidu, so I won’t talk about for the time being. It’s not that there is no more, but it’s inconvenient to continue to do it. If you continue to do it, you probably think that I am a nerd with no practical experience, because it is too theoretical and too evil, and most people don’t understand it.
So after five episodes, we will talk about the injection molding series that 80% of people are willing to listen to, otherwise only 1% of people will understand, and gradually everyone will lose interest. Let’s wait for a while later. There is still a series found on Baidu at the beginning. Don’t worry, don’t worry, so today, Baidu can’t find the series. What is the last topic of
What is the last topic of? Talking about a standard, the standard "Weight Repeat Accuracy of Injection Molding Machine", or the weight Repeatment Accuracy of Plastic Products. When we buy this standard, the manufacturer of will introduce how good my machine is, the weight repeatment accuracy is 0.5%, 1%, my this is better, only 0.3%, my god . Who on the market now says that the weight repeatment accuracy is greater than 1%, I feel embarrassed to walk, and I look up and want to enter the door of Yashizhan.
But is this really the case? I am soaking in the injection molding site every day and I am very confused about this matter. For example, this picture,
This picture is a caster of a push vacuum cleaner, with a soft PVC package ABS, this factory is in Suzhou. The problem is that the two-shoot joint is covered with a front and lack of glue.
I made a 2-ejection short shot in the field experiment and made 5 consecutive shots. Looking at these 5 products, the amount of PVC glue is different. Taking 1 and 2 as examples, it can be clearly seen that the amount of glue shots in these two holes of 1 is significantly greater than 2. Later, the weight difference between the 5 beer was between 6% and 8%. Note that the parameters have not changed, and they are all new machines.
Later I used other machines to do experiments and found that without fullness, the difference in weight repetition accuracy is generally greater than 3% to 7%~8%. This is strange, what's going on? Why is it so different from brand machine promotion and actual testing? One is 0.5%, the other is 7%. What's wrong?
Later I learned that in the injection molding machine factory, The so-called weight repetition accuracy standard is with pressure retention. What I said is that the product does not have pressure retention . This is very embarrassing. Do you know? Whether the position of the rubber injection stage in production is accurately repeated is very important for production stability, but this standard does not exist. Some are with pressure retention, and the latter is a very unreliable standard.
I'll say something. If it is kept in pressure, it will cover up the problem of poor stability in the injection process. As long as the machine's reverse ring leakage glue is not too powerful, it can meet the standards, and 1% is very easy.
For example, the national football team's physical fitness test stipulates that it is qualified to run 3,000 meters in 12 minutes. I don't play football, but I used to run. My 3,000 meters scored 11 minutes and 16 seconds, but I'm sorry that you are just qualified. You won't use a more eye-catching sort to explain how good you run?
Back to ask, the position stability of the rubber injection stage without pressure is very important in production, and the standard for weight repetition accuracy, why is this standard undecided? I can only say that Lao Yang, you are so stupid. If you ask this question, you set the standards for yourself. Why is it difficult for you to make yourself difficult??
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We provide services to injection molding companies
Shenzhen Zhenye Enterprise Management Consulting has company service purpose: to promote the concept of scientific injection molding and lean injection molding for injection molding companies, and promote the rationalization, simplification and standardization of injection molding companies' technology and management. Establish a factory operation system that is "efficient, stable, low-cost and fast response". Improve production efficiency, reduce variations in the injection molding manufacturing process, reduce costs, shorten order reaction time, reduce cash flow occupation, and ultimately enhance the comprehensive competitiveness of injection molding companies!
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