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Taizhou Union Plastic Mould Co.,Ltd

ADD:No.26, MaoFeng Street, Beicheng Development Area, Huangyan Dist., Taizhou, Zhejiang, China

Post Code: 312080

Contact:Ms vicky

Tel/wechat:+8613736206058

Skype:vicky.zhou.123

QQ:2798299958

Email:sales@tzunionmould.com

Web:www.tzunionmould.net

The Experience Of An Experienced Mold Maker, How To Improve The Success Rate Of Mold Testing!
Oct 09, 2018

Matters needing attention before mold test
1. Understand relevant information of the mold:
It is best to obtain the mold design surface, detailed analysis, and about the mold technicians to participate in testing.
2. Check the mechanical coordination on the work table first:
Care should be taken to see that there are scratches, missing parts, loose and other phenomena, whether the action of mold slide is true, whether there is leakage of water channel and air pipe joints, and if there are restrictions on the opening of the mold, it should also be marked on the mold. If the above actions can be done before the die is hung, it can avoid the problem found when the die is hung, and then the time wasted when the die is removed.
3. After determining the proper operation of each part of the mold, select the appropriate injection molding machine, and pay attention to the selection
Injection capacity
Guide bar width
Maximum kick-off
accessories
Complete, etc. After everything is confirmed to be ok, the next step is to hang the mold. When hanging the mold, please be careful not to take off all clamping formwork and the mold before opening, so as to avoid the mold falling due to loose clamping formwork or breakage.
After the mold is installed, check the mechanical action of all parts of the mold carefully. And pay attention to the discharge nozzle and feed nozzle alignment. The next step is to pay attention to mold closing. At this time, the pressure of mold closing should be lowered. In manual and low-speed mold closing, please pay attention to whether there is any unsmooth movement and abnormal sound.

4. Increase mold temperature:
According to the properties of raw materials used in the finished product and the size of the mold, select a suitable mold temperature control machine to increase the mold temperature to the required temperature in production. The motion of each part should be reviewed again once the mold temperature is raised. Since the steel may be stuck due to thermal expansion, the sliding of each part should be noted to avoid the occurrence of tension and vibration.
5. If there is no experimental plan rule in the factory, we suggest that only one condition can be adjusted at a time to distinguish the impact of single condition change on the finished product.
6. According to different raw materials, the adoption of the original freely do moderate baking.
7. Mould test and future mass production shall use the same raw materials as possible.
8. Do not test the mold completely. If you have color requirements, you can arrange the test.
9. Problems such as internal stress often affect secondary machining. The pressure of mold closing should be adjusted after the mold is closed slowly after the mold is stabilized after mold testing.
After all the above steps are checked, the closing speed and the closing pressure shall be lowered, and the safety locking bar and the jacking travel shall be set, and then the normal closing speed and the closing speed shall be adjusted. If the limit switch involving the maximum stroke is involved, adjust the mold stroke slightly short, and cut off the high-speed mold action before the maximum stroke of the mold.

After all the above steps are checked, the closing speed and the closing pressure shall be lowered, and the safety locking bar and the jacking travel shall be set, and then the normal closing speed and the closing speed shall be adjusted. If the limit switch involving the maximum stroke is involved, adjust the mold stroke slightly short, and cut off the high-speed mold action before the maximum stroke of the mold.
This is because during the whole process of mold opening, the high-speed motion travel is longer than that of the low-speed ones. The mechanical ejector bar on the plastic machine must be adjusted after full speed mold opening to avoid deformation of the ejector pin plate or stripping plate.
Please check the following items before making the first mold injection:
If the feeding schedule is too long or insufficient.
Whether the pressure is too high or too low.
Whether the filling speed is too fast or too slow.
Whether the processing cycle is too long or too short.
To prevent short shot, fracture, deformation, rough edges and even damage to the mold.
If the processing cycle is too short, the thimble will puncture the finished product or the peeling ring extrusion finished product. This situation can take you two or three hours to get the finished product out.
If the processing cycle is too long, the thin part of the mold core may break due to the contraction of the adhesive.
Of course, you can't anticipate all the problems that may occur during the model testing process, but taking timely measures in advance will help you avoid serious and expensive losses.