Method for in-mold hot cutting of round hole of plastic mold
By using in-mold hot-cut technology with timing controllers and ultra-high pressure systems in plastic molds, problems such as high labor intensity and poor accuracy caused by manual cutting in traditional in-mold hot-cut technology are solved, and automated shearing ports are realized, which improves production efficiency and product quality.
Patent Information
- Application Number
- CN202510170815.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-05-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The traditional in-mold in-cutting technology has manual manual punching, which leads to high labor intensity and easy fatigue among operators. The water port cutting knife is prone to wear and poor accuracy, and requires frequent repair or replacement, resulting in low production efficiency and high cost.
A method of hot-cut round holes in the mold of a plastic mold is adopted, and the hot-cut control in the mold is achieved through a timing controller and an ultra-high pressure system. The cutting knife heats the material when it is not cold and solid, and combines the push of the micro cylinder piston and spring to achieve automatic shearing ports.
It realizes automated shearing ports in the mold, reduces dependence on people and overall manufacturing costs, improves production efficiency and product quality, and enhances the competitiveness of the enterprise.
Smart Images
Figure CN119952924A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of in-mold hot cutting circular holes, and in particular to a method for in-mold hot cutting circular holes of a plastic mold. Background Art
[0002] In-mold hot cutting means that without changing the molding cycle and arrangement of the mold, the separation of the sprue of large sprue, side, overlap, diving, horn, annular injection and other injection methods can be completed in the mold. Through the above product characteristics, the mold structure can be simplified, the production stability, quality and yield can be improved, and the labor cost can be reduced, so as to maximize the competitiveness of customer products.
[0003] Traditional in-mold hot cutting is mostly done manually, and most of them have the following problems: the workers are labor-intensive and easily fatigued; the nozzle cutter inserts are easily worn and cannot be cut evenly, and must be repaired with a medium knife; the nozzle cutter is a consumable part and needs to be repaired or replaced every 2 weeks; the manual punching machine has poor punching accuracy and there is a risk of nozzle cutting deviation. Therefore, in order to solve the above problems, a method for hot cutting round holes in plastic molds is essential. Summary of the invention
[0004] 1. Technical issues to be resolved
[0005] In view of the deficiencies in the prior art, the present invention provides a method for hot cutting a circular hole in a plastic mold, which solves the problems existing in the above-mentioned background technology.
[0006] (II) Technical solution
[0007] To achieve the above object, the present invention provides the following technical solution: a method for hot cutting a circular hole in a plastic mold, comprising the following steps:
[0008] S1, touch: the mold closing signal is input into the timing controller through the touch switch installed on the mold;
[0009] S2, injection: the molding machine starts to inject glue to fill the mold cavity;
[0010] S3, pressure holding: When the pressure holding is about to end, the hot cutting control cutter in the mold starts to complete the cutting action. At this time, the rubber material has not yet cooled and solidified, so the cutter can achieve a hot cutting effect;
[0011] S4, cooling: the cutter remains in the separation position until the cooling is about to end, and then the cutter retreats. At this time, the product and the nozzle have been separated and formed;
[0012] S5. Completion: After the mold is opened, take out the product and the sprue. The cut is smooth and no trimming is required.
[0013] Furthermore, after the injection and pressure holding of the mold in S3 are completed, the timing controller provides high pressure to push the micro-cylinder piston, and then the micro-cylinder piston pushes the cutter to separate the product and the material head. At the same time, the time of the in-mold hot cutting controller can be adjusted to achieve the best hot cutting effect.
[0014] Furthermore, the in-mold hot cutting in the S3 is a system, which consists of an in-mold hot cutting solution, an in-mold hot cutting controller, and in-mold hot cutting accessories, wherein the in-mold hot cutting accessories are composed of standard accessories and non-standard parts.
[0015] Furthermore, the inspection operations are performed before the triggering in S1, which are to check the oil level in the oil tank, connect the power supply, connect the signal line, connect the ultra-high pressure oil pipe, turn on the emergency stop switch and turn on the power load switch.
[0016] Furthermore, the specific operation of holding pressure in S3 is to press the start button of the human-machine interface to start, enter the manual interface mode, press manual pressure increase, observe whether the mold cutter is ejected, determine that the ejection is normal, press the pressure relief button for 3 seconds, observe whether the cutter is returned, press the emergency stop switch, stop the machine, perform routine mold trial adjustment, and after good product output, confirm that the injection time + holding pressure time is the delayed pressure increase time and set the delayed pressure increase time, and the pressure relief time is set.
[0017] Furthermore, the power supply of the equipment is AC380V, the wiring method of the equipment is 3L+1N+1E, the equipment must be grounded, the hydraulic oil used by the equipment is 46#-68# ultra-high pressure hydraulic oil, and before performing the operation, it is necessary to confirm whether the ultra-high pressure oil pipe is connected to the mold, and at the same time ensure that the minimum bending radius of the ultra-high pressure oil pipe is less than 20CM (cannot be bent or squeezed) and simply fix the oil pipe so that it will not shake at will.
[0018] Furthermore, after being triggered, the machine needs to be connected to cooling water when working, and the oil temperature alarm is set to 60 degrees (alarm prompt). If the oil temperature exceeds 60 degrees, the equipment will automatically stop. After the forced stop action, it is necessary to confirm whether there is still pressure stored in the oil pipe. If there is pressure, it must be forced to be manually released before subsequent operations can be carried out.
[0019] Furthermore, the in-mold hot cutting includes a product, a cutter guide block, a cutter, a spring, a spring sleeve, a cutter pressure plate, a cylinder pressure plate, a cylinder, a piston, a high-pressure rubber ring and an oil circuit. The specific steps are: after the product injection and pressure holding are completed, the ultra-high pressure controller outputs pressure, and the piston in the cylinder pushes the cutter to move upward, and the top of the cutter collides with the parting surface of the front mold to achieve shearing, so that the product is separated from the nozzle. Subsequently, the ultra-high pressure controller releases the pressure, and the spring pushes the cutter back to its position. After the product is cooled and formed, the mold is opened to take out the product, thereby realizing automatic in-mold shearing of the nozzle.
[0020] (III) Beneficial effects
[0021] The present invention provides a method for hot cutting a circular hole in a plastic mold, which has the following beneficial effects:
[0022] After the product injection and pressure holding are completed, the ultra-high pressure controller outputs pressure, and the piston in the oil cylinder pushes the cutter upward. The top of the cutter hits the parting surface of the front mold to achieve shearing, so that the product is separated from the nozzle. Then, the ultra-high pressure controller releases the pressure, and the spring pushes the cutter back to its position. After the product is cooled and formed, the mold is opened and the product is taken out, realizing the automatic cutting of the nozzle in the mold. Effective automation is put into continuous use once, which reduces dependence on people and overall manufacturing costs, while improving the degree of automation and enhancing the future competitiveness of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The present invention is a process flow chart of a method for hot cutting a circular hole in a plastic mold;
[0024] Figure 2 A diagram showing the structure and working principle of in-mold hot cutting in a method for in-mold hot cutting of a circular hole in a plastic mold of the present invention;
[0025] Figure 3 The invention is a schematic diagram of the internal structure operation of in-mold hot cutting in a method for in-mold hot cutting of a circular hole in a plastic mold. DETAILED DESCRIPTION
[0026] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0027] Example 1
[0028] like Figure 1-Figure 3 As shown, according to one aspect of the present invention, a technical solution is provided: a method for hot cutting a circular hole in a plastic mold, comprising the following steps:
[0029] Step 1. Trigger: Input the mold clamping signal into the timing controller through the touch switch installed on the mold. Check the operation before triggering, including checking the oil level in the tank, connecting the power supply, connecting the signal line, connecting the ultra-high pressure oil pipe, turning on the emergency stop switch and turning on the power load switch. The equipment power supply is AC380V, and the equipment wiring method is 3L+1N+1E. The equipment must be grounded. The hydraulic oil used by the equipment is 46#-68# ultra-high pressure hydraulic oil. Before performing the operation, it is necessary to confirm whether the ultra-high pressure oil pipe is connected to the mold. At the same time, ensure that the minimum bending radius of the ultra-high pressure oil pipe is less than 20CM (cannot be bent or squeezed) and simply fix the oil pipe so that it will not shake at will. After triggering, the machine needs to be connected to cooling water when working. The oil temperature alarm is set to 60 degrees (alarm prompt). If the oil temperature exceeds 60 degrees, the equipment will automatically stop. After forced stop, it is necessary to confirm whether there is still pressure stored in the oil pipe. If there is pressure, it must be forced to manually release the pressure before subsequent operations can be performed.
[0030] Step 2: Injection: The molding machine starts to inject glue to fill the mold cavity.
[0031] Step 3, pressure holding: When the pressure holding is about to end, the in-mold hot cutting controls the cutter to start the feeding action. At this time, the rubber material has not yet cooled and solidified, so the cutter can achieve the hot cutting effect. After the mold injection and pressure holding are completed, the timing controller provides high pressure to push the micro cylinder piston, and then the micro cylinder piston pushes the cutter to separate the product and the material head. At the same time, the time of the in-mold hot cutting controller can be adjusted to achieve the best hot cutting effect. In-mold hot cutting is a system, which consists of an in-mold hot cutting solution, an in-mold hot cutting controller, and in-mold hot cutting accessories. The in-mold hot cutting accessories are composed of standard accessories and non-standard parts. The specific operation of pressure holding is to press the start button of the human-machine interface to start, enter the manual interface mode, press manual pressure increase, observe whether the mold cutter is ejected, confirm that the ejection is normal, and then press the pressure relief button 3 Seconds, observe whether the cutter returns, press the emergency stop switch, stop the machine, perform routine mold trial adjustment, and produce good products. Confirm that the injection time + pressure holding time is the delayed pressurization time and set the delayed pressurization time. Set the pressure relief time. The in-mold hot cutting includes the product, cutter guide block, cutter, spring, spring sleeve, cutter pressure plate, cylinder pressure plate, cylinder, piston, high-pressure rubber ring and oil circuit. The specific steps are as follows: after the product injection and pressure holding are completed, the ultra-high pressure controller outputs pressure, and the piston in the cylinder pushes the cutter to move upward. The top of the cutter hits the parting surface of the front mold to achieve shearing, so that the product is separated from the nozzle. Subsequently, the ultra-high pressure controller removes the pressure, and the spring pushes the cutter back. After the product is cooled and formed, the mold is opened to take out the product, realizing the automatic shearing of the nozzle in the mold.
[0032] Step 4: Cooling: The cutter remains in the separation position until the cooling is about to end, then the cutter returns. At this time, the product and the nozzle have been separated and formed.
[0033] Step 5. Completion: After the mold is opened, take out the product and the sprue. The cut is smooth and no trimming is required.
[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for hot cutting a circular hole in a plastic mold, characterized in that: The following steps are involved: S1, touch: the mold closing signal is input into the timing controller through the touch switch installed on the mold; S2, injection: the molding machine starts to inject glue to fill the mold cavity; S3, pressure holding: When the pressure holding is about to end, the hot cutting control cutter in the mold starts to complete the cutting action. At this time, the rubber material has not yet cooled and solidified, so the cutter can achieve a hot cutting effect; S4, cooling: the cutter remains in the separation position until the cooling is about to end, and then the cutter retreats. At this time, the product and the nozzle have been separated and formed; S5. Completion: After the mold is opened, take out the product and the sprue. The cut is smooth and no trimming is required.
2. A method for hot cutting a circular hole in a plastic mold according to claim 1, characterized in that: After the injection and pressure holding of the mold in S3 are completed, the timing controller provides high pressure to push the micro-cylinder piston, and then the micro-cylinder piston pushes the cutter to separate the product and the material head. At the same time, the time of the in-mold hot cutting controller can be adjusted to achieve the best hot cutting effect.
3. The method for hot cutting a circular hole in a plastic mold according to claim 1, characterized in that: The in-mold hot cutting in S3 is a system, which consists of an in-mold hot cutting solution, an in-mold hot cutting controller, and in-mold hot cutting accessories, wherein the in-mold hot cutting accessories are composed of standard accessories and non-standard parts.
4. The method for hot cutting a circular hole in a plastic mold according to claim 1, characterized in that: The inspection operations before triggering in S1 are sequentially checking the oil level in the oil tank, connecting the power supply, connecting the signal line, connecting the ultra-high pressure oil pipe, turning on the emergency stop switch and turning on the power load switch.
5. The method for hot cutting a circular hole in a plastic mold according to claim 1, characterized in that: The specific operation of holding pressure in S3 is to press the start button of the human-machine interface to start, enter the manual interface mode, press manual pressure increase, observe whether the mold cutter is ejected, confirm that the ejection is normal, then press the pressure relief button for 3 seconds, observe whether the cutter returns, press the emergency stop switch, stop the machine, perform routine mold trial adjustment, and after good product output, confirm that the injection time + holding pressure time is the delayed pressure increase time and set the delayed pressure increase time, and the pressure relief time is set.
6. The method for hot cutting a circular hole in a plastic mold according to claim 4, characterized in that: The power supply of the equipment is AC380V, the wiring method of the equipment is 3L+1N+1E, the equipment must be grounded, the hydraulic oil used by the equipment is 46#-68# ultra-high pressure hydraulic oil, and before performing the operation, it is necessary to confirm whether the ultra-high pressure oil pipe is connected to the mold, and at the same time ensure that the minimum bending radius of the ultra-high pressure oil pipe is less than 20CM (cannot be bent or squeezed) and simply fix the oil pipe so that it will not shake at will.
7. A method for hot cutting a circular hole in a plastic mold according to claim 6, characterized in that: After the trigger is triggered, the machine needs to be connected to cooling water when working. The oil temperature alarm is set to 60 degrees (alarm prompt). If the oil temperature exceeds 60 degrees, the equipment will automatically stop. After the forced stop action, it is necessary to confirm whether there is still pressure stored in the oil pipe. If there is pressure, it must be forced to manually release the pressure before subsequent operations can be carried out.
8. The method for hot cutting a circular hole in a plastic mold according to claim 2, characterized in that: The in-mold hot cutting includes a product, a cutter guide block, a cutter, a spring, a spring sleeve, a cutter pressure plate, a cylinder pressure plate, a cylinder, a piston, a high-pressure rubber ring and an oil circuit. The specific steps are as follows: after the product injection and pressure holding are completed, the ultra-high pressure controller outputs pressure, the piston in the cylinder pushes the cutter to move upward, the top of the cutter hits the parting surface of the front mold to achieve shearing, and the product is separated from the nozzle. Subsequently, the ultra-high pressure controller releases the pressure, the spring pushes the cutter back to its position, and after the product is cooled and formed, the mold is opened to take out the product, thereby realizing automatic in-mold nozzle shearing.