One, what is the test mode?
Test mode refers to the product development and manufacturing process in the product after the completion of mold production, mass production before the test injection step. In the Automotive Injection Mold test mode before we pay attention to the following matters:
1, to understand the mold of the relevant information
It is best to obtain the design of the mold surface, detailed analysis, and about the mold technician to participate in the test work.
2, first check the work on the table with the mechanical action
Should pay attention to whether the scratches, missing parts and loosening and other phenomena, mold to the slide action is true, whether the waterway and tracheal joints leak, mold opening if the restrictions should also be marked on the mold. If the above action can be done before the hanging mode, you can avoid the problem when the die, and then go to the demolition of the mold occurred in the waste of time.
3, when the mold to determine the appropriate action, we must choose the appropriate test mode injection machine, in the choice should pay attention to:
(1) the maximum injection rate of Automotive Injection Molding machine is how much;
(2) the lower end of the rod is placed under the mold;
(3) whether the maximum movement stroke of the activity template meets the requirements;
(4) other related test tools with tools and accessories are prepared.
Everything is confirmed no problem after the next step is to hang the mold, hanging should pay attention to all the folder on the lock template and open the mold before the fishing do not remove, so as not to loose or loose template so die die.
After the mold is installed, please carefully check the mechanical parts of the mold parts, such as skateboard, thimble, retreat structure and limit the action of the switch is true. And note that the nozzle is aligned with the feed port.
The next step is to pay attention to the clamping action, this time should be down the mold pressure down, in the manual and low-speed clamping action to see if there is any smooth action and abnormal sound and so on.
Lifting mold process is relatively simple, need to carefully place the main mold gate and nozzle of the school center is more difficult, usually can be used to test the way the center of the test paper.
4, to improve the mold temperature:
Depending on the performance of the finished product and the size of the mold, the appropriate temperature control machine is used to increase the temperature of the mold to the temperature required for production. After the mold temperature is raised, the operation of each part must be examined again. Since the steel may cause the mold phenomenon after thermal expansion, it is necessary to pay attention to the sliding of the parts so as to avoid the occurrence of strain and vibration.
5, if the factory did not implement the experimental plan rules, we propose to adjust the conditions of the test time can only adjust a condition in order to distinguish between a single condition changes on the impact of finished products.
6, according to different raw materials, the original used to make appropriate baking.
7, try to mold and future production as much as possible using the same raw materials.
8, do not completely test the material, if the color needs, can be arranged to try the color.
9, internal stress and other issues often affect the secondary processing, should be after the test model to be finished after the stability of the secondary processing mold in the slow after the close, to adjust the mold pressure, and action several times to see if Mold pressure uneven phenomenon, so as to avoid the finished product and mold deformation.
After the above steps are checked and then turn off the mold speed and off the mold pressure down, and the safety buckle and the trip out of the trip, and then transferred to the normal off mode and off mode speed. If the limit switch for the maximum stroke is involved, the opening stroke should be adjusted slightly and the high speed open operation is cut off before the maximum stroke is opened. This is due to the mold during the entire mold during the trip, the high-speed action travel longer than the low speed. In the plastic machine on the mechanical out of the rod must also be transferred in full-speed mode after the action, so that the top plate or peel plate force and deformation.
Please check the following before making the first mold:
(1) whether the feeding stroke is too long or insufficient;
(2) whether the pressure is too high or too low;
(3) whether the filling speed is too fast or too slow;
(4) whether the processing cycle is too long or too short.
To prevent the finished product short shot, broken, deformation, burr and even hurt the mold. If the processing cycle is too short, the thimble will wear the finished product or stripping the finished product. This may cause you to spend two or three hours to remove the finished product.
If the processing cycle is too long, the mold core of the weak parts may be due to shrinkage and cut off the material. Of course, you can not anticipate all the problems that may occur in the trial process, but the prior precautions to be taken in a timely manner will help you avoid serious and expensive losses.
Second, the Automotive Injection Mold is how to test it?
In order to avoid unnecessary waste of time and trouble, it is necessary to pay patience to adjust and control a variety of processing conditions, and to find the best temperature and pressure conditions, and the development of standard test procedures, and can be used for Establish daily work methods.
1, check the plastic material within the barrel is correct, and whether in accordance with the provisions of baking, (test mode and production if the use of different raw materials is likely to come to different results).
2, the tube to clean up thoroughly, to prevent the deterioration of the compound or miscellaneous materials into the mold, because the bad solution and miscellaneous materials may die stuck die. Check the temperature of the pipe and the temperature of the mold is suitable for the processing of raw materials.
3, adjust the pressure and injection in order to produce a satisfactory appearance of the finished product, but can not run the edge, especially when some of the mold cavity finished product has not yet fully solidified, in the adjustment of various control conditions should be considered before, because the filling A slight change in the rate may cause very large filling changes.
4, to wait until the conditions of the machine and die stabilized, that is, medium-sized machines may have to wait more than 30 minutes. You can use this time to see the finished product may occur.
5, the screw forward time can not be shorter than the gate plastic solidification time, otherwise the finished product weight will be reduced and damage to the finished product performance. And when the mold is heated when the screw forward time also need to lengthen in order to compact the finished product.
6, reasonable adjustment to reduce the total processing cycle.
7, the newly transferred conditions run at least 30 minutes and even stable, and then at least continuous production of a dozen full-size samples, marked on its Sheng date, quantity, and placed by the mold points, respectively, in order to test the stability of its operation And derive reasonable control tolerances. (Especially valuable for multi - hole molds).
8. Measure the continuous sample and record its important dimensions (wait for the sample to cool to room temperature).
9, the size of each sample size for a comparison, should pay attention to:
(1) whether the product size is stable;
(2) whether there is any increase or decrease in the size of the trend shows that the machining conditions are still changing, such as poor temperature control or oil pressure control;
(3) whether the size of the changes within the tolerance range.
10, if the finished product size is not changing and processing conditions are normal, you need to observe whether the finished product of each mold its quality can be accepted, the size can be tolerated within the tolerance. The amount of continuous or large or less than the average value of the mold points recorded in order to check the size of the mold is correct.
Third, in the Automotive Injection Mold test mode to record the test process in the parameters obtained
Record and analyze the data as a need to modify the mold and production conditions, and for future production time reference.
1, so that the processing run longer, to stabilize the melt temperature and hydraulic oil temperature.
2, according to all the size of the finished product is too large or too small to adjust the conditions of the machine, if the shrinkage is too large and finished products appear insufficient material, but also reference to increase the gate size.
3, the size of the mold cavity is too large or too small to be amended, if the mold cavity and the door size is still correct, then you should try to change the machine conditions, such as filling speed, mold temperature and pressure, Whether the filling is slow.
4, according to the mold of the finished product with the situation or mold core shift, to be individually amended, may be able to try to adjust the mold speed and mold temperature, in order to improve its uniformity.
5, check and modify the injection machine failure, such as pumps, oil valves, temperature controller, etc. will lead to poor processing conditions, even if the perfect mold can not maintain bad machine to play a good work efficiency.
6. After reviewing all of the recorded values, keep a set of samples to verify whether the samples have been corrected.
7, the proper preservation of all the test process in the test sample records, including the processing cycle of various pressures, melt and mold temperature, tube temperature, injection action time, screw feeding period, in short, should save all future Help to successfully establish the same processing conditions of the data in order to obtain quality standards of the product.
At present, the factory test mode often overlooks the mold temperature, and in the short test mode and the future production mold temperature is the most difficult to grasp, and the correct mold temperature enough to affect the sample size, luminosity, shrinkage, If you do not use the mold temperature controller to grip when the future production may be difficult.