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CN-119840120-B - Injection molding machine with mold parallelism control structure and control method thereof

CN119840120BCN 119840120 BCN119840120 BCN 119840120BCN-119840120-B

Abstract

The invention relates to an injection molding machine with a mould parallelism control structure and a control method thereof, wherein the injection molding machine comprises a mould closing structure, a mould, a plurality of range finders and a controller; the die assembly structure comprises a fixed die plate, a movable die plate and a plurality of first driving pieces, wherein the fixed die plate is arranged opposite to the movable die plate, the plurality of first driving pieces are arranged on the end face, far away from the fixed die plate, of the movable die plate, the die comprises a fixed die and a movable die, the range finders are arranged on the die and correspond to the first driving pieces one by one, the mounting positions of the range finders correspond to the mounting positions of the first driving pieces, and the controller is respectively and electrically connected with the range finders and the first driving pieces. According to the invention, when the first driving piece on the movable mould plate moves, the distance meter can accurately measure the distance change of the position, corresponding to the first driving piece, on the movable mould, and the distance meter feeds back the measured result to the controller, and the controller controls the corresponding first driving piece to adjust the moving speed and distance, so that the measured result among a plurality of distance meters is kept consistent within a certain range, the moving accuracy and parallelism of the movable mould are effectively improved, and the thickness of a product can be ensured to be more uniform and more accurate in the injection molding and foaming processes.

Inventors

  • LIU TAO
  • REN XINTING

Assignees

  • 克劳斯玛菲机械(中国)有限公司

Dates

Publication Date
20260512
Application Date
20250120

Claims (12)

  1. 1. The utility model provides an injection molding machine with mould parallelism control structure, its characterized in that, mould parallelism control structure is used for the injection molding compression of injection molding machine and/or keeps keeping parallelism all the time between movable mould and the cover half mould in the foaming process of opening the mould, includes: The mold clamping structure (10), the mold clamping structure (10) comprises a fixed mold plate (11), a movable mold plate (12) and a plurality of first driving pieces (13), wherein the fixed mold plate (11) and the movable mold plate (12) are oppositely arranged, and the plurality of first driving pieces (13) are arranged on the end surface, far away from the fixed mold plate (11), of the movable mold plate (12) and are used for driving the movable mold plate (12) to be close to or far away from the fixed mold plate (11); The mold (20), the mold (20) comprises a fixed mold (21) and a movable mold (22), the movable mold (22) is connected with the movable mold plate (12), and the fixed mold (21) is connected with the fixed mold plate (11); The device comprises a plurality of range finders (30), wherein the range finders (30) are arranged on a die (20), the range finders (30) are in one-to-one correspondence with first driving pieces (13), the installation positions of the range finders (30) correspond to the installation positions of the first driving pieces (13) and are used for detecting the distance between a parting surface of a movable die (22) and a parting surface of a fixed die (21) at the corresponding installation positions of the first driving pieces (13), the four corner areas of the movable die plate are respectively provided with the first driving pieces (13), four range finders are arranged, and each range finders and the first driving pieces (13) corresponding to the installation positions are arranged in a collinear way along the direction of the opposite arrangement of the fixed die plate and the movable die plate; The controller (50) is electrically connected with the distance measuring instrument (30) and the first driving piece (13) respectively, the controller (50) is used for controlling the first driving piece (13) corresponding to the installation position according to the detection result of the distance measuring instrument (30), wherein the controller (50) controls the plurality of first driving pieces (13) by comparing the detection results among the plurality of distance measuring instruments (30) in the injection compression and/or mold opening foaming process so as to keep the detection results among the plurality of distance measuring instruments (30) dynamically consistent, and meanwhile, the controller (50) uses the preset mold opening and closing size as a standard, compares the detection results of the distance measuring instrument (30), adjusts the first driving piece (13) and enables the detection results of the plurality of distance measuring instruments (3) to be dynamically consistent with the preset mold opening and closing size; The range finder (30) comprises a transmitter (31) and a receiver (32), wherein the transmitter (31) is arranged on the fixed die (21) or the movable die (22), the receiver (32) is correspondingly arranged on the movable die (22) or the fixed die (21), the transmitter (31) is oppositely arranged with the receiver (32), the receiver (32) is used for receiving signals transmitted by the transmitter (31), the mounting position of the transmitter (31) is parallel to the parting surface of the fixed die (21) or the movable die (22), and the mounting position of the receiver (32) is correspondingly parallel to the parting surface of the movable die (22) or the fixed die (21).
  2. 2. The injection molding machine with the mold parallelism control structure according to claim 1, wherein the first driving member (13) includes a high-pressure cylinder (131), a proportional valve (132) and a hydraulic power source (133), the high-pressure cylinder (131) is connected with an end surface of the movable platen (12) away from the fixed platen (11), the proportional valve (132) is respectively communicated with the high-pressure cylinder (131) and the hydraulic power source (133), and the controller (50) is connected with the proportional valve (132) for controlling a flow rate and a pressure of the proportional valve (132) according to a detection result of the range finder (30).
  3. 3. The injection molding machine with the mold parallelism control structure according to claim 1, further comprising a second driving member (15), the second driving member (15) being provided on an end face of the movable platen (12) close to the fixed platen (11) for driving the movable platen (12) close to or away from the fixed platen (11).
  4. 4. The injection molding machine with the mold parallelism control structure according to claim 1, further comprising a sealing frame and a telescopic driving piece, wherein the sealing frame is arranged around the injection molding foaming product and used for being abutted to the periphery of the injection molding foaming product, and the telescopic driving piece is connected with the sealing frame and used for changing the distance of pushing out or retracting the sealing frame into a mold surface.
  5. 5. Injection molding machine with mold parallelism control structure according to claim 1, characterized in that the clamping structure (10) further comprises an intermediate mold plate, which is located between the fixed mold plate and the movable mold plate, on which a first mold and a second mold are provided, respectively, and on which a third mold and a fourth mold are provided, respectively, on both sides, the intermediate mold plate being rotatable about a straight axis, so that the clamping structure (10) has a first clamping state and a second clamping state, wherein, In the first mold closing state, the first mold and the third mold are closed, and the second mold and the fourth mold are closed; And in the second die closing state, the first die and the fourth die are closed, and the second die and the third die are closed.
  6. 6. The injection molding machine with the mold parallelism control structure according to claim 5, wherein a first emitter and a second emitter are respectively arranged on a third mold and a fourth mold on the middle mold plate, a first receiver and a second receiver which are respectively arranged on the first mold on the movable mold plate (12) and the second mold on the fixed mold plate (11) and correspond to the first mold and the second mold, the first receiver and the first emitter form a first range finder in a first mold closing state, the second receiver and the second emitter form a second range finder in a second mold closing state, the first receiver and the second emitter form a first range finder, and the second receiver and the first emitter form a second range finder in a second mold closing state.
  7. 7. Injection molding machine with mould parallelism control structure according to any one of claims 1-6, characterized in that the distance meter (30) comprises a magnetic induction electronic ruler, wherein the transmitter (31) is an induction magnet, the receiver (32) receives the position information of the induction magnet and converts the magnetic signal into distance information, which is then transmitted to the controller (50).
  8. 8. A control method of an injection molding machine, applicable to the injection molding machine according to any one of claims 1 to 6, characterized by comprising the steps of: s1, performing zero calibration on a plurality of range finders (30); S2, presetting the opening and closing size of a die (20); S3, controlling the first driving piece (13) to enable the movable template (12) to move close to or away from the fixed template (11); S4, acquiring detection results of a plurality of distance meters (30) in the moving process of the movable template (12); S5, controlling a plurality of first driving pieces (13) so as to keep consistency among detection results of a plurality of distance meters (30); S6, when the detection results of the range finders (30) reach the opening and closing size, controlling the first driving piece (13) so that the movable template (12) and the fixed template (11) are kept relatively static; s7, acquiring detection results of a plurality of range finders (30) in the static process of the movable template (12); and S8, controlling the first driving pieces (13) so that the detection results of the distance meters (30) are consistent with the opening and closing sizes.
  9. 9. The method according to claim 8, characterized in that in the step S1, it comprises the steps of: Controlling a first driving piece (13) to enable a movable template (12) to move close to the fixed template (11) to enter a die clamping calibration state, wherein the calibration die clamping force of the first driving piece (13) is 50% of the maximum die clamping force; In a mold clamping calibration state, zero calibration is performed on a plurality of distance meters (30).
  10. 10. The method according to claim 8, wherein in the step S5, the method comprises the following steps: Selecting any one of the range finders (30) as a target range finders (30), selecting the range finders (30) except for the target range finders (30) as other range finders (30), and obtaining a result difference value between the detection result of the target range finders (30) and the detection result of the other range finders (30); And controlling a first driving piece (13) of the target range finder (30) corresponding to the installation position according to the result difference value, so that the movable template (12) corresponding to the installation position is close to or far away from the fixed template (11).
  11. 11. The control method of an injection molding machine according to claim 10, wherein in the step of controlling the first driving member (13) of the target distance meter (30) corresponding to the installation position according to the result difference, the method comprises the following specific steps: D 1 -d 2 < -e, controlling the driving force of the first driving piece (13) at the corresponding installation position of the target distance meter (30) to be reduced until the detection result of the target distance meter (30) meets the following relation that d 1 -d 2 is less than or equal to-e; D 1 -d 2 > e, controlling the driving force of the first driving piece (13) at the corresponding installation position of the target distance meter (30) to be increased until the detection result of the target distance meter (30) meets the following relation that-e is less than or equal to d 1 -d 2 is less than or equal to e; Wherein d 1 is the detection result of the target range finder (30), d 2 is the detection result of other range finders (30) except the target range finders (30), e is the allowable thickness deviation of the product, and e is more than or equal to-0.1 and less than or equal to-0.1.
  12. 12. The method according to claim 11, characterized in that in step S8, it comprises the following steps: D < D-e, controlling the driving force of the first driving piece (13) at the corresponding installation position of the distance meter (30) to be reduced until the detection result of the distance meter (30) meets the following relation that D-e is less than or equal to D and less than or equal to D+e; D > D+e, controlling the driving force of the first driving piece (13) at the corresponding installation position of the distance meter (30) to increase until the detection result of the distance meter (30) meets the following relationship that D-e is less than or equal to D and less than or equal to D+e; wherein D is the detection result of any range finder (30), D is the opening and closing size of the die (20), e is the allowable thickness deviation of the product, and e is more than or equal to-0.1 and less than or equal to-0.1.

Description

Injection molding machine with mold parallelism control structure and control method thereof Technical Field The invention relates to the technical field of injection molding machines, in particular to an injection molding machine with a mold parallelism control structure and a control method thereof. Background Injection molding machines are also known as injection molding machines or injection molding machines. It is a main forming equipment for making thermoplastic plastics or thermosetting plastics into various shaped plastic products by using plastic forming mould. The injection molding machine is generally provided with an injection screw, a mold closing structure and a mold, wherein the mold closing structure is used for driving the mold to open and close, the injection screw can heat plastic and apply high pressure to the molten plastic, and the molten plastic is ejected out of the screw to fill a mold cavity. With the development of plastic parts, especially plastic parts in the field of new energy automobiles, the parts produced by conventional injection molding technology are difficult to meet the current increasing demands on functionality and performance, and products with lighter weight and system integration are produced by combining injection compression technology, open-mold foaming technology and the like, so that the trend in the industry is achieved. In order to ensure the stability and uniformity of the wall thickness of the product, the movable mold plate moves with the movable mold in the injection compression process and the mold opening foaming process, and needs to be always kept parallel to the fixed mold. In the field of automobiles, the tonnage of an injection molding machine is basically about 1600-4000 tons, and the weight of a mold is in the range of 15-40 tons, so that the weight range of a corresponding movable mold plate and the movable mold is about 25-57 tons, and the parallel movement of the control and braking mold has a certain technical difficulty. The existing injection molding machine needs to keep a parallel relation with the half side of the fixed mold all the time no matter in the injection compression process or in the mold opening compression technology, or else the wall thickness of the product can generate serious deviation. If no problem is found, proper detection is required when the equipment is stopped and overhauled, and if the problem is found when the equipment is overhauled, the equipment runs for a long time under the state that the templates are not parallel, and the equipment damage or the defect of the mould damage and the product are necessarily caused. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide an injection molding machine with a mold parallelism control structure and a control method thereof. The aim of the invention can be achieved by the following technical scheme: An injection molding machine with a mold parallelism control structure, comprising: The mold clamping structure comprises a fixed mold plate, a movable mold plate and a plurality of first driving pieces, wherein the fixed mold plate and the movable mold plate are oppositely arranged, and the plurality of first driving pieces are arranged on the end surface of the movable mold plate far away from the fixed mold plate and used for driving the movable mold plate to be close to or far away from the fixed mold plate; The mold comprises a fixed mold and a movable mold, the movable mold is connected with the movable mold plate, and the fixed mold is connected with the fixed mold plate; The distance measuring devices are arranged on the die, the distance measuring devices are in one-to-one correspondence with the first driving pieces, the mounting positions of the distance measuring devices correspond to the mounting positions of the first driving pieces, and the distance measuring devices are used for detecting the distance between the parting surface of the movable die and the parting surface of the fixed die at the corresponding mounting positions of the first driving pieces; And the controller is electrically connected with the distance meter and the first driving piece respectively and is used for controlling the first driving piece at the corresponding installation position according to the detection result of the distance meter. In one embodiment, the range finder comprises a transmitter and a receiver, wherein the transmitter is arranged on the fixed die or the movable die, the receiver is correspondingly arranged on the movable die or the fixed die, the transmitter is opposite to the receiver, the receiver is used for receiving signals transmitted by the transmitter, the mounting position of the transmitter is parallel to the parting surface of the fixed die or the movable die, and the mounting position of the receiver is correspondingly parallel to the parting surface of the movable die or the fixed die. In one embodiment, the