Injection molding machine multistage mold locking molding method

An injection molding machine and multi-stage technology, which is applied in the field of multi-stage clamping molding of injection molding machines, can solve the problems of long production cycle, high injection equivalent, and poor molding quality of injection molding products, so as to improve molding quality, ensure volume, and increase injection equivalent Effect

Active Publication Date: 2019-04-12
HAITIAN PLASTICS MACHINERY GRP
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for multi-stage clamping molding of an injection molding machine ...
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Method used

By this repeated mold opening, mold locking and synchronization with the first injection pressure holding, micro-expansion is carried out during mold opening, and then the mold clamping force is improved during mold locking to extr...
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Abstract

The invention provides an injection molding machine multistage mold locking molding method. The method comprises the steps of S10, starting the high pressure mode of an injection molding machine, andstarting the injection molding machine to conduct injection molding on a mold when the injection molding pressure reaches up to a preset first pressure value; S20, controlling an injection molding machine mold plate to move to open the mold after delaying of the preset time and adjusting the injection molding machine to a preset first state to enable the injection molding machine to conduct primary injection and pressure maintaining according to the preset first state; S30, controlling the injection molding machine mold plate to move to lock the mold and adjusting the injection molding machineto a preset second state to enable the injection molding machine to continue primary injection and pressure maintaining according to the preset second state; and S40, judging whether the injection molding machine completes primary injection and pressure maintaining or not, if yes, locking the mold, conducting secondary injection and pressure maintaining to mold a product, and if not, returning tothe step S20. According to the injection molding machine multistage mold locking molding method, multiple times of mold opening and mold locking are conducted in the injection and pressure maintaining process, and the molding quality of the product with the abundant injection capacity, large volume and long production cycle is improved.

Technology Topic

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  • Injection molding machine multistage mold locking molding method
  • Injection molding machine multistage mold locking molding method
  • Injection molding machine multistage mold locking molding method

Examples

  • Experimental program(2)

Example Embodiment

[0028] Example one
[0029] Such as figure 1 As shown, this embodiment provides a method for multi-stage clamping and molding of an injection molding machine, including the steps:
[0030] S10: Increase the pressure on the injection molding machine, and when the injection pressure reaches the preset first pressure value, start the injection molding machine to inject the mold;
[0031] S20: After delaying a preset time, control the injection molding machine template to move to open the mold, and adjust the injection molding machine to a preset first state, and the injection molding machine performs the first injection protection through the preset first state. Pressure
[0032] S30: Control the movement of the injection molding machine template to perform mold clamping, and adjust the injection molding machine to a preset second state, and the injection molding machine continues to perform the first injection and pressure retention through the preset second state;
[0033] S40: Determine whether the first injection pressure holding of the injection molding machine is finished, if yes, lock the mold, and perform the second injection holding pressure to mold the product, if not, go to step S20.
[0034] When the injection molding machine is molding products with long production cycle, large injection equivalent and large volume, the molded product is affected by the factors of long molding cycle, long injection time and large volume. The molding quality is low, and the product qualification rate is not high. The injection molding process method provided in this example can effectively improve product quality and make product molding more perfect.
[0035] It should be understood that the mold opening in this embodiment is slightly opened, that is, the distance of the template movement is very short, which is controlled within 1-5 mm.
[0036] Before step S10, it also includes step S00, controlling the injection molding machine to perform mold clamping and brake.
[0037] Before injection molding, the injection molding machine needs to be prepared accordingly. The mold clamping device of the injection molding machine is mainly composed of front and rear fixed template, movable template, pull rod and movable template driving device. Before the injection molding machine, the mold needs to be closed. After the mold is closed, an integral cavity is formed in the mold. The holding brake is a kind of holding action, which can be fully locked after passing the holding brake.
[0038] In step S10, the general injection molding machine needs to be high pressure before injection molding, and the preset first pressure value is the injection pressure value. After the injection molding machine is high pressure, the preset first pressure value can be reached before normal injection can be performed.
[0039] In step S20, after the injection action of the injection molding machine is started, there is molten plastic in the cavity of the mold. After the preset time, the molten plastic can be initially formed in the cavity. This time is the preset time. The setting time can be set according to the actual situation.
[0040] The mold opening of the injection molding machine is controlled by tie rods. In this embodiment, there are a total of four tie rods, and the four tie rods act and cooperate with the corresponding valves to drive the template to move. It should be noted that the moving distance of the template is relative to other objects, and the moving distance of the template during the mold opening process is very small, and the moving distance of the template is 1-5 mm. In this embodiment, the moving distance of the template is set at 3 mm.
[0041] In this embodiment, the preset first state includes that the plunger pump is in a preset minimum flow state, where the plunger pump relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil absorption, Pressure oil. When the plunger pump is in the preset minimum flow state, the movement of the plunger is slow, and the clamping force of the injection molding machine is small, which is convenient for the template to move slightly. At this time, the injection molding machine is still injecting molten plastic into the mold cavity of.
[0042] Before step S30, it further includes step S21, judging whether the template has moved to a preset position or whether the moving time of the template has reached the preset moving time, and if so, proceed to step S30.
[0043] Among them, the template will move relatively during the mold opening process, and the movement of the template is limited by position or time. When the template moves to the preset position or the template movement time reaches the preset movement time, it means that the critical value has been reached. At this time, the template needs to perform a return movement in the opposite direction to return to the original clamping state.
[0044] Further, each time the mold is locked, the clamping pressure of the injection molding machine when the mold is locked is correspondingly increased once according to the preset pressure value.
[0045] Can refer to Figure 4 , Figure 4 As the number of clamping times increases, the clamping force increases continuously. After four clampings, the clamping force increases from 1000 to 2000.
[0046] The preset movement time and preset position can be set, such as Figure 4 As shown, Figure 4 It also has a clamping force setting function. When the template returns to the clamping state through the return movement, the clamping force of this time can be set at this time, that is, the plunger pump talks about the preset maximum flow state.
[0047] In step S30, the preset second state of the injection molding machine includes that the plunger pump is in a preset maximum flow state. Among them, when the plunger pump is in the preset maximum flow state, the clamping pressure of the mold is the largest, so that the injection pressure of the injection machine can be adjusted to a larger value to achieve the clamping pressure. At this time, through a higher injection pressure, Ensure that the product can be fully squeezed and improve the molding quality of the product.
[0048] In step S20 and step S30, the first injection pressure holding means that after the injection molding machine is started, the molten plastic is injected into the cavity of the mold. At this time, due to thermal expansion and contraction, the injection molding machine needs to perform injection pressure holding. Maintaining a certain amount of injection can prevent the plastic from shrinking and shrinking when it is condensing. The first injection and holding pressure has been throughout the entire mold opening and clamping process.
[0049] In step S40, the time length of the first injection holding pressure is set to the time required to complete four mold opening and clamping, that is, after multiple mold opening and clamping are repeated, the first injection holding pressure is completed , At this time, after the mold is locked, the second injection and pressure holding are performed directly, and the product is formed after the second injection and pressure holding.
[0050] Through this repeated mold opening and mold clamping and synchronization with the first injection and holding pressure, micro-expansion is carried out when the mold is opened, and the clamping force is increased for extrusion when the mold is locked, which improves the molding quality of the product, especially for Some products with larger volume, more injection equivalent, and long production cycle, repeated swelling and extrusion, make the molding effect of the product better.

Example Embodiment

[0051] Example two
[0052] Such as figure 2 As shown, this embodiment provides a multi-stage clamping molding method for an injection molding machine. The difference between this embodiment and the first embodiment is that a proportional pressure valve, a shut-off valve, and a high-pressure proportional valve for clamping are added.
[0053] The newly-added proportional pressure valve, shut-off valve and high-pressure proportional valve for clamping are set in the clamping hydraulic system of the injection molding machine to control the micro-opening and clamping process of the cooperative template.
[0054] When the injection molding machine closes, brakes and reaches the clamping pressure, the injection molding machine starts injection. After a certain delay, the injection molding machine template starts to open slightly, that is, the template moves relative to each other to open the mold, and the proportional pressure is increased at this time The valve and the shut-off valve become the output state.
[0055] The template of the injection molding machine is driven by pulling the tie rod, and the tie rod and the clamping high pressure proportional valve are linked. When the tie rod is pulled, the clamping high pressure proportional valve starts to output. When the tie rod is pulled down to the maximum, the template moves to the maximum when the mold is opened. When the limit is reached, the output of the high-pressure proportional valve of the clamping mode reaches the lowest valley, so as to cooperate with the slight opening of the template.
[0056] When the pull rod reaches its maximum limit, it is necessary to start the clamping action at this time, that is, the new proportional pressure valve and the shut-off valve are closed. After the clamping, the output of the clamping high-pressure proportional valve reaches the highest peak, providing the corresponding clamping force.
[0057] Such reciprocating mold opening and mold clamping are performed until the pressure holding is completed, at which time the second injection and pressure holding are performed. After the second injection and pressure holding is completed, the product is finally formed.
[0058] The difference between this embodiment and the first embodiment is that it further includes step S11. When the multi-stage mold locking molding signal is received, step S20 is entered. If the multi-stage mold locking molding signal is not received, the preset Injection pressure holding to shape the product.
[0059] The injection molding machine can perform general locking molding process or multi-stage locking molding. Users can choose according to actual product requirements, such as image 3 As shown, the injection molding machine is provided with a function menu for starting multi-stage clamping and molding. If this function menu is selected, it will enter step S20. If the function menu is not selected, it is a conventional clamping molding process and the injection molding machine will perform Preset injection holding pressure to shape the product.
[0060] Such as Figure 5 As shown, Figure 5 The mechanical structure diagram of the clamping and the micro-opening part is provided. In the figure, the serial number 1 indicates the clamping mechanism, 2 indicates the movable mold, and 3 indicates the guide post. The mold clamping mechanism 1 can push, and the mold clamping mechanism 1 can provide corresponding Clamping force to ensure that the mold can be fully locked to match the different injection pressures of the injection molding machine.
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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