Disclosure of Invention
Therefore, the invention provides a processing method and a device of a plastic product, which are used for overcoming the problems that in the prior art, the performance parameters of the plastic product which is difficult to prepare according to actual needs are adjusted to the production method of a mold, and the production efficiency of the mold is difficult to improve.
In order to achieve the above object, the present invention provides a method for processing a plastic product, comprising:
step one, a central control unit receives pressure data information of a pressure sensor arranged at the top of a lower body of a die, determines a pressure value required to be reached by the pressure sensor according to the thickness of a plastic product to be prepared, and controls a second motor arranged at the top of a motor cabin to stop rotating when the pressure value of the pressure sensor is received in real time and reaches a preset value;
secondly, the central control unit determines a performance reference value x of the plastic product according to the thickness and density of the plastic product to be prepared and the temperature of a melt for preparing the plastic product, and determines initial working parameters of cooling temperature, cooling time, injection pressure and injection speed in a cooling unit arranged in the lower body of the mold and an injection unit arranged above an injection port of the upper body of the mold according to the determined performance reference value x;
step three, when the injection molding unit and the cooling unit finish the work, the ejection unit arranged in the box body correspondingly determines the rotating speed of a first motor arranged in the ejection unit according to the thickness of the plastic product to be prepared, and ejects the plastic product to complete the preparation of the plastic product for the first time;
step four, when the injection molding unit, the cooling unit and the ejection unit prepare the first plastic product according to the determined working parameters, the central control unit compares the thickness of the plastic product prepared in real time with the preset thickness of the plastic product to be prepared, adjusts the cooling time and the cooling temperature in the cooling unit when the second plastic product is prepared, and the central control unit compares the density of the plastic product prepared in real time with the preset density of the plastic product to be prepared, and adjusts the injection molding pressure and the injection molding speed in the injection molding unit when the second plastic product is prepared;
step five, if the thickness of the plastic product to be actually prepared is larger than the preset thickness of the plastic product to be prepared, adjusting the cooling time of the cooling unit to be a parameter after the preset sequence, and adjusting the cooling temperature to be a parameter before the preset sequence, if the thickness of the plastic product to be actually prepared is smaller than the preset thickness of the plastic product to be prepared, adjusting the cooling time of the cooling unit to be a parameter before the preset sequence, and adjusting the cooling temperature to be a parameter after the preset sequence, if the thickness of the plastic product to be actually prepared is equal to the preset thickness of the plastic product to be prepared, the cooling time and the cooling temperature of the cooling unit do not need to be adjusted;
and step six, if the density of the actually prepared plastic product is greater than the preset density of the plastic product to be prepared, adjusting the injection pressure and the injection speed of the injection unit to be parameters before the preset sequence, if the density of the actually prepared plastic product is less than the preset density of the plastic product to be prepared, adjusting the injection pressure and the injection speed of the injection unit to be parameters after the preset sequence, and if the density of the actually prepared plastic product is equal to the preset density of the plastic product to be prepared, adjusting the injection pressure and the injection speed of the injection unit is not needed until the preparation work of all the plastic products is completed. Further, in the second step, the central control unit determines a performance reference value x of the plastic product according to the thickness and the density of the plastic product to be prepared and the temperature of the melt for preparing the plastic product,
x = 0.5×H/H0+0.6×ρ/ρ0+0.4× T/T0
wherein x represents a performance reference value of the plastic product to be prepared, H represents the thickness of the plastic product to be prepared, ρ represents the density of the plastic product to be prepared, T represents the temperature of the melt of the plastic product to be prepared, H0 represents the thickness of the preset plastic product, ρ 0 represents the density of the preset plastic product, and T0 represents the temperature of the preset melt.
Further, a mold working parameter matrix group W (W1, W2, W3 … Wn) is preset in the central control unit, wherein W1 represents a first preset working parameter, W2 represents a second preset working parameter, W3 represents a third preset working parameter, and Wn represents an nth preset working parameter;
for the ith mold operating parameter matrix set Wi, i =1, 2, 3 … n, Wi (WZP, WZV, WLT, WLS), where WZP represents the injection pressure of the injection unit, WZV represents the injection rate of the injection unit, WLT represents the cooling temperature of the cooling unit, and WLS represents the cooling time of the cooling unit;
an injection pressure matrix WZP (WZP 1, WZP2, WZP3 … WZPn) for the injection unit, wherein WZP1 represents a first preset injection pressure, WZP2 represents a second preset injection pressure, WZP3 represents a third preset injection pressure, WZPn represents an nth preset injection pressure, WZP1 < WZP2 < WZP3 < WZPn;
an injection rate matrix WZV (WZV 1, WZV2, WZV3 … WZVn) for the injection unit, wherein WZV1 represents a first preset injection rate, WZV2 represents a second preset injection rate, WZV3 represents a third preset injection rate, WZVn represents an nth preset injection rate WZV1 < WZV2 < WZV3 < WZVn;
a cooling temperature matrix WLT (WLT 1, WLT2, WLT3 … WLTn) for the cooling unit, wherein WLT1 represents a first preset cooling temperature, WLT2 represents a second preset cooling temperature, WLT3 represents a third preset cooling temperature, WLTn represents an nth preset cooling temperature, WLT1 < WLT2 < WLT3 < WLTn;
a cooling time matrix WLS (WLS 1, WLS2, WLS3 … WLSn) for the cooling unit, wherein WLS1 denotes a first preset cooling time, WLS2 denotes a second preset cooling time, WLS3 denotes a third preset cooling time, WLSn denotes an nth preset cooling time, WLS1 < WLS2 < WLS3 < WLSn.
Further, a performance reference value matrix x0 (x 1, x2, x3 … xn) is preset in the central control unit, wherein x1 represents a first preset performance reference value, x2 represents a second preset performance reference value, x3 represents a third preset performance reference value, and xn represents an nth preset performance reference value;
in the second step, the central control unit determines the working parameters of the injection unit and the cooling unit according to the performance reference value x of the plastic product,
when x is less than or equal to x1, the central control unit determines that a mold working parameter matrix group is W1, and selects WZP1 as injection pressure, WZV1 as injection speed, WLT1 as cooling temperature and WLS1 as cooling time from a W1 matrix group;
when x is larger than x1 and is not larger than x2, the central control unit determines that the matrix group of the working parameters of the mold is W2, and selects WZP2 as injection pressure, WZV2 as injection speed, WLT2 as cooling temperature and WLS2 as cooling time from the matrix group of W2;
when x is larger than x2 and is not larger than x3, the central control unit determines that the matrix group of the working parameters of the mold is W3, and selects WZP3 as injection pressure, WZV3 as injection speed, WLT3 as cooling temperature and WLS3 as cooling time from the matrix group of W3;
when x (n-1) < x is less than or equal to xn, the central control unit determines the matrix group of the working parameters of the mold as Wn, and selects WZPn as injection pressure, WZVn as injection speed, WLTn as cooling temperature and WLSn as cooling time from the matrix group of Wn.
Further, in the fifth step, when the mold prepares the first plastic product according to the determined working parameters, the central control unit sets the thickness of the actually prepared plastic product to be Hs1, compares the thickness Hs1 of the actually prepared plastic product with the thickness H of the plastic product to be prepared, and adjusts the cooling time WLSi and the cooling temperature WLTi in the cooling unit when the mold prepares the second plastic product,
when Hs1 is more than or equal to 0.9 XH and less than H, the central control unit adjusts the cooling time of the cooling unit to be WLS (i-1) and adjusts the cooling temperature to be WLT (i + 1);
when Hs1 is more than or equal to 0.8 XH and less than 0.9 XH, the central control unit adjusts the cooling time of the cooling unit to WLS (i-2) and adjusts the cooling temperature to WLT (i + 2);
when Hs1= H, the central control unit keeps the cooling time of the cooling unit at WLSi and the cooling temperature at WLTi;
when H is more than Hs1 and is not more than 1.1 XH, the central control unit adjusts the cooling time of the cooling unit to be WLS (i +1) and adjusts the cooling temperature to be WLT (i-1);
when Hs1 is more than 1.1 XH and less than or equal to 1.2 XH, the central control unit adjusts the cooling time of the cooling unit to WLS (i +2) and adjusts the cooling temperature to WLT (i-2);
when Hs1 is more than 1.2 XH or Hs1 is less than 0.8 XH, the central control unit judges that the plastic product does not meet the requirement, and re-determines the performance reference value of the plastic product to be prepared for re-preparation.
Further, in the sixth step, when the mold prepares the first plastic product according to the determined working parameters, the central control unit sets the density of the actually prepared plastic product to be ρ s1, compares the density ρ s1 of the actually prepared plastic product with the density ρ of the plastic product to be prepared, and adjusts the injection pressure WZPi and the injection rate WZVi in the injection unit when the mold prepares the second plastic product,
when rho is not less than 0.9 multiplied by rho and is 1 < rho, the central control unit adjusts the injection pressure of the injection unit to be WZP (i +1) and adjusts the injection rate to be WZV (i + 1);
when rho 1 is more than or equal to 0.8 multiplied by rho and less than 0.9 multiplied by rho, the central control unit adjusts the injection pressure of the injection unit to be WZP (i +2) and adjusts the injection rate to be WZV (i + 2);
when ρ s1= ρ, the central control unit maintains an injection pressure of the injection unit at WZPi and an injection rate at WZVi;
when rho < rho s1 is not less than 1.1 multiplied by rho, the central control unit adjusts the injection pressure of the injection unit to WZP (i-1) and adjusts the injection rate to WZV (i-1);
when the pressure is more than 1.1 multiplied by rho and less than or equal to rho s1 and less than or equal to 1.2 multiplied by rho, the central control unit adjusts the injection pressure of the injection unit to be WZP (i-2) and adjusts the injection rate to be WZV (i-2);
when rho s1 is larger than 1.2 multiplied by rho or rho s1 is smaller than 0.8 multiplied by rho, the central control unit judges that the plastic product is not qualified, and determines the performance reference value of the plastic product to be prepared again to prepare again.
Further, a plastic thickness matrix H0 (H1, H2, H3 … Hn) is preset in the central control unit, wherein H1 represents a first preset thickness of the plastic, H2 represents a second preset thickness of the plastic, H3 represents a third preset thickness of the plastic, Hn represents an nth preset thickness of the plastic, and H1 < H2 < H3 < Hn.
Further, in the first step, the central control unit determines the stop time of the second motor according to the thickness H of the plastic product to be prepared,
when H is not more than H1 and the pressure value received by the central control unit from the pressure sensor is Y1, the central control unit controls the second motor to stop rotating;
when H1 is larger than H and is less than or equal to H2, and the pressure value received by the central control unit from the pressure sensor is Y2, the central control unit controls the second motor to stop rotating;
when H2 is larger than H and is less than or equal to H3, and the pressure value received by the central control unit from the pressure sensor is Y3, the central control unit controls the second motor to stop rotating;
and when H (n-1) < H and Hn are less than or equal to H, and the pressure value received by the central control unit from the pressure sensor is Yn, the central control unit controls the second motor to stop rotating.
Further, a first motor rotating speed matrix V0 (V1, V2, V3 … Vn) is preset in the central control unit, wherein V1 represents a first preset rotating speed of the first motor, V2 represents a second preset rotating speed of the first motor, V3 represents a third preset rotating speed of the first motor, Vn represents an nth preset rotating speed of the first motor, and V1 < V2 < V3 < Vn;
in the third step, the central control unit determines the rotating speed of the first motor in the ejection unit according to the thickness Hi of the plastic product to be prepared,
when H is not more than H1, the central control unit controls the rotating speed of a first motor in the ejection unit to be V1;
when H1 is more than H and less than or equal to H2, the central control unit controls the rotating speed of a first motor in the ejection unit to be V2;
when H2 is more than H and less than or equal to H3, the central control unit controls the rotating speed of a first motor in the ejection unit to be V3;
and when H (n-1) < H and Hn are less than or equal to H, the central control unit controls the rotating speed of the first motor in the ejection unit to be Vn.
Further, a processing apparatus for plastic products, which is used for processing plastic products with the processing method for plastic products, the processing apparatus comprises: the box body is of a box body type structure, supporting legs are welded at the bottom of the box body, and a box door is hinged to the front side wall of the box body;
the die lower body is welded and mounted at the top of the box body, a die forming cavity is formed in the top of the die lower body, a top block is movably mounted at the bottom of the die forming cavity, a first screw rod is welded and mounted at the bottom of the top block, a pressure sensor is welded and mounted at the top of the die lower body, and the die lower body is used for providing a cavity to finish the preparation of a plastic product;
the upper die body is arranged at the top of the lower die body and matched with the lower die body, the top of the upper die body is provided with a die injection port, the top of the upper die body is welded with a second screw rod, and the upper die body is used for conveying raw materials of plastic products to the lower die body through the die injection port;
the injection molding unit injects a melt needing to prepare plastics into the mold forming cavity through the injection molding opening, a motor, a pressure detector, a speed detector and a pump are arranged in the injection molding unit, the motor is used for controlling the injection molding speed of the injection molding unit, the speed sensor is used for detecting the injection molding speed of the injection molding unit, and a valve is arranged on the pump and used for adjusting the injection molding pressure of the injection molding unit;
the ejection unit comprises a first motor arranged at the bottom of the inner side of the box body in a welding mode, a first bevel gear is arranged at the output end of the first motor in a welding mode through a coupler, a rotating shaft is rotatably arranged at the top of the box body, the free end of the rotating shaft longitudinally penetrates through the top of the box body and extends to the inside of the box body, a second bevel gear is arranged at the free end of the rotating shaft in a welding mode, the first bevel gear and the second bevel gear are meshed, the rotating shaft is connected with a first screw rod, and the first screw rod longitudinally penetrates through the bottom of a mold forming cavity and extends to the outside of the lower body of the mold so as to eject a plastic product in the lower body of the mold;
a cooling unit which comprises a cooling pipe arranged in the lower die body and a water tank welded at the bottom of the inner side of the box body, the cooling pipe is provided with a water inlet and a water outlet, the top of the inner side of the box body is welded with a first water pump and a second water pump, the input end of the first water pump is welded and arranged with the water outlet of the cooling pipe, the output end of the first water pump is welded and arranged with the water outlet pipe, the water outlet pipe is communicated with the water tank, the input end of the second water pump is welded with a water inlet pipe, the output end of the second water pump is welded and arranged with the water inlet of the cooling pipe, the water inlet pipe is communicated with the water tank, the cooling unit is also internally provided with a temperature detector, the first water pump and the second water pump are provided with a first electromagnetic valve and a second electromagnetic valve, and the cooling unit is used for cooling the plastic product in the mold;
the working frame is welded at the top of the box body, a motor bin is arranged at the bottom of the working frame, a second motor is welded at the top of the motor bin, a sleeve is welded at the output end of the second motor through a coupler, and the sleeve and the second screw rod are arranged in a threaded manner and used for controlling the longitudinal movement of the upper body of the die;
the central control unit is arranged outside the box body, is respectively connected with the first motor, the second motor, the pressure sensor, the first electromagnetic valve, the second electromagnetic valve, the motor, the pressure detector, the speed detector and the valve, and controls the working states of the first motor, the second motor, the pressure sensor, the first electromagnetic valve, the second electromagnetic valve, the motor, the pressure detector, the speed detector and the valve;
compared with the prior art, the invention has the advantages that the performance reference value x of the plastic product is determined by the central control unit according to the thickness and the density of the plastic product to be prepared and the temperature of a melt for preparing the plastic product, so that the initial working parameters of the cooling temperature, the cooling time, the injection pressure and the injection speed in the cooling unit and the injection unit in the mold are determined, when the injection unit and the cooling unit complete the work, the ejection unit ejects the plastic product according to the rotating speed of the first motor which is determined according to the thickness of the plastic product to be prepared, so as to complete the preparation of the first plastic product, the central control unit compares the thickness and the density of the plastic product to be prepared in real time with the preset thickness and density of the plastic product to be prepared, so as to adjust the working parameters of the cooling unit and the injection unit during the second plastic product, the reject ratio of the plastic products is reduced, thereby improving the production efficiency of the plastic products.
Further, the central control unit determines a pressure value which needs to be reached by the pressure sensor according to the thickness of the plastic product which needs to be prepared, receives the pressure value transmitted by the pressure sensor, controls the second motor to stop rotating when the pressure value of the pressure sensor which is received in real time reaches a preset value, and controls the first motor to rotate to eject the mold when the mold completes one-time preparation and a certain distance is reserved between the upper mold body and the lower mold body by controlling the second motor to rotate by the central control unit, so that the preparation work of the plastic product is completed, and the production efficiency of the mold is further improved.
Particularly, when the plastic product produced by the mold is unqualified, the central control unit re-determines the performance reference value of the plastic product to be prepared and starts to re-prepare, the re-prepared data is taken as first preparation data, the re-prepared first data is compared with preset data of the plastic product, and the second preparation working parameters are determined until the preparation work of all the plastic products is completed.
Furthermore, the first motor drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the rotating shaft to rotate, the jacking block is lifted through the first screw rod matched with the internal thread in the rotating shaft, so that the mold after injection molding is convenient to take, the second motor drives the sleeve to rotate, so that the second screw rod drives the upper mold body to move longitudinally, the mold body is closed, water in the water tank is injected into the cooling pipe through the first water pump and the second water pump, the temperature of the mold body is reduced, and the preparation efficiency of the injection molding device is improved.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, the present invention provides a processing apparatus for plastic products, including a box 1, which is a box 1 type structure, wherein the bottom of the box 1 is welded with supporting legs 25, and the front side wall of the box 1 is hinged with a box door 27; the die lower body 3 is welded and installed at the top of the box body 1, a die forming cavity 6 is formed in the top of the die lower body 3, an ejector block 19 is movably installed at the bottom of the die forming cavity 6, a first screw rod 18 is welded and installed at the bottom of the ejector block 19, a pressure sensor 20 is welded and installed at the top of the die lower body 3, and the die lower body 3 is used for providing a cavity to finish the preparation of a plastic product; the upper die body 4 is arranged at the top of the lower die body 3, the upper die body 4 is matched with the lower die body 3, the top of the upper die body 4 is provided with a die injection port 5, the top of the upper die body 4 is welded with a second screw rod 24, and the upper die body 4 is used for conveying raw materials of plastic products to the lower die body 3 through the die injection port 5; the injection molding unit (not shown in the figure) injects a melt of plastics to be prepared into the mold forming cavity 6 through the injection molding opening 5, a motor (not shown in the figure), a pressure detector (not shown in the figure), a speed detector (not shown in the figure) and a pump (not shown in the figure) are arranged in the injection molding unit, the motor is used for controlling the injection molding speed of the injection molding unit, the speed sensor is used for detecting the injection molding speed of the injection molding unit, and a valve is arranged on the pump and used for adjusting the injection molding pressure of the injection molding unit; an ejection unit (not shown in the figure), which comprises a first motor 14 welded and installed at the bottom of the inner side of the box body 1, a first bevel gear 15 welded and installed at the output end of the first motor 14 through a coupler, a rotating shaft 17 rotatably installed at the top of the box body 1, a free end of the rotating shaft 17 longitudinally penetrating the top of the box body 1 and extending to the inside of the box body 1, a second bevel gear 16 welded and installed at the free end of the rotating shaft 17, the first bevel gear 15 and the second bevel gear 16 meshed and installed, the rotating shaft 17 connected with a first lead screw 18, the first lead screw 18 longitudinally penetrating the bottom of the mold forming cavity 6 and extending to the outside of the mold lower body 3, so as to eject the plastic product in the mold lower body 3; a cooling unit (not shown in the figure) which comprises a cooling pipe 7 arranged in the lower body 3 of the mold and a water tank 26 welded at the bottom of the inner side of the box body 1, wherein the cooling pipe 7 is provided with a water inlet 8 and a water outlet 9, the top of the inner side of the box body 1 is welded with a first water pump 10 and a second water pump 13, the input end of the first water pump 10 is welded with the water outlet 9 of the cooling pipe 7, the output end of the first water pump 10 is welded with a water outlet pipe 12, the water outlet pipe 12 is communicated with the water tank 26, the input end of the second water pump 13 is welded with a water inlet pipe 11, the output end of the second water pump 13 is welded with the water inlet 8 of the cooling pipe 7, the water inlet pipe 11 is communicated with the water tank 26, a temperature detector (not shown in the figure) is also arranged in the cooling unit, and a first electromagnetic valve and a second electromagnetic valve are, the cooling unit is used for cooling the plastic product in the mold; the working frame 2 is welded at the top of the box body 1, a motor bin 21 is arranged at the bottom of the working frame 2, a second motor 22 is welded at the top of the motor bin 21, a sleeve 23 is welded at the output end of the second motor 22 through a coupler, and the sleeve 23 and the second screw rod 24 are arranged in a threaded manner and used for controlling the longitudinal movement of the upper die body 4; and a central control unit (not shown in the figure) disposed outside the case 1, the central control unit being connected to the first motor 14, the second motor 22, the pressure detector, the pressure sensor 20, the first solenoid valve, the second solenoid valve, the speed detector, and the valve, respectively, and controlling the operating states of the first motor 14, the second motor 22, the pressure sensor 20, the first solenoid valve, the second solenoid valve, the pressure detector, the speed detector, and the valve.
Specifically, in the embodiment of the present invention, the top of the top block 19 is flush with the bottom of the mold forming cavity 6, the rotating shaft 17 is cylindrical, the inner side wall of the rotating shaft is provided with an internal thread and is matched with the first screw rod 18, the inner side wall of the sleeve 23 is provided with an internal thread and is matched with the second screw rod 24, the working frame 2 is L-shaped and is located right above the middle of the mold upper body 4, and four sets of the support legs 25 are provided and are arranged in a rectangular array.
Specifically, in the embodiment of the present invention, the first motor 14 and the second motor 22 are respectively connected to an encoder, the central control unit controls and adjusts the operating states of the first motor 14 and the second motor 22 through the encoder, the central control unit receives pressure data transmitted by the pressure sensor 20 and controls the second motor 22 according to the data information of the pressure sensor 20, the central control unit changes the injection molding rate and the injection molding pressure of the injection molding unit by receiving data of the analysis speed detector and the pressure detector and by adjusting the operating states of the motor and the pump in the injection molding unit, and the central control unit controls the first electromagnetic valve and the second electromagnetic valve to realize the cooling temperature and the cooling time of the cooling unit.
A method of processing a plastic article, comprising:
step one, a central control unit receives pressure data information of a pressure sensor arranged at the top of a lower body of a die, determines a pressure value required to be reached by the pressure sensor according to the thickness of a plastic product to be prepared, and controls a second motor arranged at the top of a motor cabin to stop rotating when the pressure value of the pressure sensor is received in real time and reaches a preset value;
secondly, the central control unit determines a performance reference value x of the plastic product according to the thickness and density of the plastic product to be prepared and the temperature of a melt for preparing the plastic product, and determines initial working parameters of cooling temperature, cooling time, injection pressure and injection speed in a cooling unit arranged in the lower body of the mold and an injection unit arranged above an injection port of the upper body of the mold according to the determined performance reference value x;
step three, when the injection molding unit and the cooling unit finish the work, the ejection unit arranged in the box body correspondingly determines the rotating speed of a first motor arranged in the ejection unit according to the thickness of the plastic product to be prepared, and ejects the plastic product to complete the preparation of the plastic product for the first time;
step four, when the injection molding unit, the cooling unit and the ejection unit prepare the first plastic product according to the determined working parameters, the central control unit compares the thickness of the plastic product prepared in real time with the preset thickness of the plastic product to be prepared, adjusts the cooling time and the cooling temperature in the cooling unit when the second plastic product is prepared, and the central control unit compares the density of the plastic product prepared in real time with the preset density of the plastic product to be prepared, and adjusts the injection molding pressure and the injection molding speed in the injection molding unit when the second plastic product is prepared;
step five, if the thickness of the plastic product to be actually prepared is larger than the preset thickness of the plastic product to be prepared, adjusting the cooling time of the cooling unit to be a parameter after the preset sequence, and adjusting the cooling temperature to be a parameter before the preset sequence, if the thickness of the plastic product to be actually prepared is smaller than the preset thickness of the plastic product to be prepared, adjusting the cooling time of the cooling unit to be a parameter before the preset sequence, and adjusting the cooling temperature to be a parameter after the preset sequence, if the thickness of the plastic product to be actually prepared is equal to the preset thickness of the plastic product to be prepared, the cooling time and the cooling temperature of the cooling unit do not need to be adjusted;
and step six, if the density of the actually prepared plastic product is greater than the preset density of the plastic product to be prepared, adjusting the injection pressure and the injection speed of the injection unit to be parameters before the preset sequence, if the density of the actually prepared plastic product is less than the preset density of the plastic product to be prepared, adjusting the injection pressure and the injection speed of the injection unit to be parameters after the preset sequence, and if the density of the actually prepared plastic product is equal to the preset density of the plastic product to be prepared, adjusting the injection pressure and the injection speed of the injection unit is not needed until the preparation work of all the plastic products is completed.
Specifically, in the embodiment of the present invention, when the mold finishes each time a plastic product is prepared, the second motor 22 moves the mold upper body 4 to a preset position, and the ejection unit adjusts the ejection speed of the ejection unit by adjusting the rotation speed of the first motor 14 according to the thickness of the plastic product to be prepared.
Specifically, in the embodiment of the present invention, a plastic thickness matrix H0 (H1, H2, H3 … Hn) is preset in the central control unit, where H1 represents a first preset thickness of the plastic, H2 represents a second preset thickness of the plastic, H3 represents a third preset thickness of the plastic, Hn represents an nth preset thickness of the plastic, and H1 < H2 < H3 < Hn.
Specifically, in the embodiment of the present invention, the thickness of the plastic product to be prepared may be 0.01, or may be 0.1, which is determined according to the type of the plastic product to be prepared and the actual requirement.
Specifically, in the first step, the central control unit determines the stop time of the second motor 22 according to the thickness H of the plastic product to be prepared,
when H is less than or equal to H1 and the pressure value received by the central control unit from the pressure sensor 20 is Y1, the central control unit controls the second motor 22 to stop rotating;
when H1 is more than H and less than or equal to H2, and the pressure value received by the central control unit 20 is Y2, the central control unit controls the second motor 22 to stop rotating;
when H2 is more than H and less than or equal to H3, and the pressure value received by the central control unit 20 is Y3, the central control unit controls the second motor 22 to stop rotating;
when H (n-1) < H ≦ Hn, and the central control unit receives the pressure value Yn of the pressure sensor 20, the central control unit controls the second motor 22 to stop rotating.
Specifically, in the embodiment of the present invention, when the mold is started, the central control unit adjusts the second motor 22 to operate to a preset position, when the thickness of the plastic product to be prepared is determined, the central control unit adjusts the second motor 22 to rotate, and when the thickness of the plastic product to be prepared is determined, the second motor 22 stops rotating.
Specifically, in the embodiment of the present invention, a rotation speed matrix V0 (V1, V2, V3 … Vn) of the first electric motor 14 is preset in the central control unit, wherein V1 represents a first preset rotation speed of the first electric motor 14, V2 represents a second preset rotation speed of the first electric motor 14, V3 represents a third preset rotation speed of the first electric motor 14, Vn represents an nth preset rotation speed of the first electric motor 14, and V1 < V2 < V3 < Vn.
In the third step, the central control unit determines the rotating speed of the first motor 14 in the ejection unit according to the thickness Hi of the plastic product to be prepared,
when H is less than or equal to H1, the central control unit controls the rotating speed of the first motor 14 in the ejection unit to be V1;
when H1 is more than H and less than or equal to H2, the central control unit controls the rotating speed of the first motor 14 in the ejection unit to be V2;
when H2 is more than H and less than or equal to H3, the central control unit controls the rotating speed of the first motor 14 in the ejection unit to be V3;
when H (n-1) < H ≦ Hn, the central control unit controls the rotating speed of the first motor 14 in the ejection unit to be Vn.
Specifically, in the embodiment of the present invention, a mold working parameter matrix group W (W1, W2, W3 … Wn) is preset in the central control unit, where W1 represents a first preset working parameter, W2 represents a second preset working parameter, W3 represents a third preset working parameter, and Wn represents an nth preset working parameter. For the ith mold operating parameter matrix set Wi, i =1, 2, 3 … n, Wi (WZP, WZV, WLT, WLS), where WZP represents the injection pressure of the injection unit, WZV represents the injection rate of the injection unit, WLT represents the cooling temperature of the cooling unit, and WLS represents the cooling time of the cooling unit.
Specifically, in the embodiment of the present invention, an injection pressure matrix WZP (WZP 1, WZP2, WZP3 … WZPn) for the injection unit is shown, wherein WZP1 represents a first preset injection pressure, WZP2 represents a second preset injection pressure, WZP3 represents a third preset injection pressure, WZPn represents an nth preset injection pressure, and WZP1 < WZP2 < WZP3 < WZPn.
Specifically, in the embodiment of the present invention, the injection molding rate matrix WZV (WZV 1, WZV2, WZV3 … WZVn) for the injection molding unit, wherein WZV1 represents a first preset injection molding rate, WZV2 represents a second preset injection molding rate, WZV3 represents a third preset injection molding rate, and WZVn represents an nth preset injection molding rate WZV1 < WZV2 < WZV3 < WZVn.
Specifically, in the embodiment of the present invention, a cooling temperature matrix WLT (WLT 1, WLT2, WLT3 … WLTn) for the cooling unit is provided, where WLT1 represents a first preset cooling temperature, WLT2 represents a second preset cooling temperature, WLT3 represents a third preset cooling temperature, WLTn represents an nth preset cooling temperature, and WLT1 < WLT2 < WLT3 < WLTn.
Specifically, in the embodiment of the present invention, a cooling time matrix WLS (WLS 1, WLS2, WLS3 … WLSn) of the cooling unit is provided, where WLS1 represents a first preset cooling time, WLS2 represents a second preset cooling time, WLS3 represents a third preset cooling time, WLSn represents an nth preset cooling time, and WLS1 < WLS2 < WLS3 < WLSn.
Specifically, in the second step, the central control unit determines the performance reference value x of the plastic product according to the thickness and density of the plastic product to be prepared and the temperature of the melt for preparing the plastic product,
x = 0.5×H/H0+0.6×ρ/ρ0+0.4× T/T0
wherein x represents a performance reference value of the plastic product to be prepared, H represents the thickness of the plastic product to be prepared, ρ represents the density of the plastic product to be prepared, T represents the temperature of the melt of the plastic product to be prepared, H0 represents the thickness of the preset plastic product, ρ 0 represents the density of the preset plastic product, and T0 represents the temperature of the preset melt.
Specifically, in the embodiment of the present invention, T0, ρ 0, and H0 may be determined according to the material of the plastic product, or may be preset values in advance, for example, T0 may be 300 ℃, ρ 0 may be set to 1.3, and H0 may be set to 0.05.
Specifically, in the embodiment of the present invention, a performance reference value matrix x0 (x 1, x2, x3 … xn) is preset in the central control unit, where x1 represents a first preset performance reference value, x2 represents a second preset performance reference value, x3 represents a third preset performance reference value, and xn represents an nth preset performance reference value.
In the second step, the central control unit determines the working parameter matrix group of the mould according to the performance reference value x of the plastic product,
when x is less than or equal to x1, the central control unit determines that a mold working parameter matrix group is W1, and selects WZP1 as injection pressure, WZV1 as injection speed, WLT1 as cooling temperature and WLS1 as cooling time from a W1 matrix group;
when x is larger than x1 and is not larger than x2, the central control unit determines that the matrix group of the working parameters of the mold is W2, and selects WZP2 as injection pressure, WZV2 as injection speed, WLT2 as cooling temperature and WLS2 as cooling time from the matrix group of W2;
when x is larger than x2 and is not larger than x3, the central control unit determines that the matrix group of the working parameters of the mold is W3, and selects WZP3 as injection pressure, WZV3 as injection speed, WLT3 as cooling temperature and WLS3 as cooling time from the matrix group of W3;
when x (n-1) < x is less than or equal to xn, the central control unit determines the matrix group of the working parameters of the mold as Wn, and selects WZPn as injection pressure, WZVn as injection speed, WLTn as cooling temperature and WLSn as cooling time from the matrix group of Wn.
Specifically, in the fifth step of the present invention, when the mold has prepared the first plastic product according to the determined operating parameters, the central control unit sets the thickness of the actually prepared plastic product to be Hs1, compares the thickness Hs1 of the actually prepared plastic product with the thickness H of the plastic product to be prepared, and adjusts the cooling time WLSi and the cooling temperature WLTi in the cooling unit when the mold prepares the second plastic product,
when Hs1 is more than or equal to 0.9 XH and less than H, the central control unit adjusts the cooling time of the cooling unit to be WLS (i-1) and adjusts the cooling temperature to be WLT (i + 1);
when Hs1 is more than or equal to 0.8 XH and less than 0.9 XH, the central control unit adjusts the cooling time of the cooling unit to WLS (i-2) and adjusts the cooling temperature to WLT (i + 2);
when Hs1= H, the central control unit keeps the cooling time of the cooling unit at WLSi and the cooling temperature at WLTi;
when H is more than Hs1 and is not more than 1.1 XH, the central control unit adjusts the cooling time of the cooling unit to be WLS (i +1) and adjusts the cooling temperature to be WLT (i-1);
when Hs1 is more than 1.1 XH and less than or equal to 1.2 XH, the central control unit adjusts the cooling time of the cooling unit to WLS (i +2) and adjusts the cooling temperature to WLT (i-2);
when Hs1 is more than 1.2 XH or Hs1 is less than 0.8 XH, the central control unit judges that the plastic product does not meet the requirement, and re-determines the performance reference value of the plastic product to be prepared for re-preparation.
Specifically, in the sixth step of the present invention, when the mold has prepared the first plastic product according to the determined operating parameters, the central control unit sets the density of the actually prepared plastic product to ρ s1, compares the density of the actually prepared plastic product ρ s1 with the density ρ of the plastic product to be prepared, and adjusts the injection pressure WZPi and the injection rate WZVi in the injection unit when the mold prepares the second plastic product,
when rho is not less than 0.9 multiplied by rho and is 1 < rho, the central control unit adjusts the injection pressure of the injection unit to be WZP (i +1) and adjusts the injection rate to be WZV (i + 1);
when rho 1 is more than or equal to 0.8 multiplied by rho and less than 0.9 multiplied by rho, the central control unit adjusts the injection pressure of the injection unit to be WZP (i +2) and adjusts the injection rate to be WZV (i + 2);
when ρ s1= ρ, the central control unit maintains an injection pressure of the injection unit at WZPi and an injection rate at WZVi;
when rho < rho s1 is not less than 1.1 multiplied by rho, the central control unit adjusts the injection pressure of the injection unit to WZP (i-1) and adjusts the injection rate to WZV (i-1);
when the pressure is more than 1.1 multiplied by rho and less than or equal to rho s1 and less than or equal to 1.2 multiplied by rho, the central control unit adjusts the injection pressure of the injection unit to be WZP (i-2) and adjusts the injection rate to be WZV (i-2);
when rho s1 is larger than 1.2 multiplied by rho or rho s1 is smaller than 0.8 multiplied by rho, the central control unit judges that the plastic product is not qualified, and determines the performance reference value of the plastic product to be prepared again to prepare again.
Specifically, in the embodiment of the present invention, the thickness of the plastic product may be acquired by taking an average thickness of a plurality of positions as a reference value, or may be detected by taking a thickness of a certain fixed position as an acquired value, and specifically, the acquisition mode of the thickness is adjusted according to the type and the requirement of the actually prepared plastic product. The thickness can be detected by a vernier caliper or an ultrasonic thickness gauge, and the thickness detection method is not limited by the invention.
Specifically, in the embodiment of the present invention, the density of the plastic product may be detected by using a dipping method, or may be detected by using a plastic densimeter, and the density acquisition mode is specifically adjusted according to the type and the requirement of the actually prepared plastic product.
Specifically, in the embodiment of the invention, when the mold prepares the plastic product again, the prepared data is used as the first preparation data, the first data after the preparation is compared with the preset data of the plastic product, and the working parameters of the second preparation are determined until all the preparation work of the plastic product is completed.
Specifically, in the embodiment of the present invention, when the central control unit adjusts the cooling temperature, the cooling time, the injection pressure, and the injection rate, if the current cooling temperature and/or the cooling time and/or the injection pressure and/or the injection rate is the maximum value, and the central control unit still needs to be adjusted to the value after the preset sequence, the central control unit takes the current cooling temperature and/or the cooling time and/or the injection pressure and/or the injection rate as the reference, and if the current cooling temperature and/or the cooling time and/or the injection pressure and/or the injection rate is the minimum value, the central control unit still needs to be adjusted to the value before the preset sequence, and the central control unit takes the current cooling temperature and/or the cooling time and/or the injection pressure and/or the injection rate as the reference.
Specifically, in the embodiment of the present invention, when the current WLSi = WLS1, the central control unit adjusts the cooling time to WLS (i-1), the WLS1 is used as the adjusted cooling time, and when the current WLSi = WLSn, the central control unit adjusts the cooling time to WLS (i +1), the WLSn is used as the adjusted cooling time, and the central control unit adjusts the cooling temperature, the injection pressure, and the injection rate in the same manner.
Specifically, in the embodiment of the present invention, the central control unit controls the second motor 22 to rotate to drive the sleeve 23 to rotate so as to move the second lead screw 24 downward, the second lead screw 24 moves to drive the mold upper body 4 to move downward, when the central control unit receives data of the pressure sensor 20 after the mold lower body 3 contacts with the mold upper body 4 and a certain pressure is generated, the central control unit controls the second motor 22 to stop rotating, the melt of the plastic product to be prepared is injected into the mold forming cavity 6 from the injection molding opening 5 through the injection molding unit, the central control unit controls the first electromagnetic valve and the second electromagnetic valve so as to control the first water pump 10 and the second water pump 13 to work simultaneously to circulate water in the water tank 26 in the cooling pipe 7 so as to cool the mold body, and after injection molding, the central control unit controls the second motor 22 to move so as to lift the mold upper body 4, the first motor 14 drives the first bevel gear 15 to rotate, the first bevel gear 15 drives the second bevel gear 16 to rotate, the rotating shaft 17 at the top of the second bevel gear 16 rotates to lift the first screw rod 18, and the ejection block 19 at the top of the first screw rod 18 ejects the injection-molded mold.
Specifically, in the embodiment of the invention, the central control unit drives the first bevel gear 15 to rotate through the first motor 14, drives the second bevel gear 16 to rotate through the first bevel gear 15, drives the rotating shaft 17 to rotate through the second bevel gear 16, lifts the top block 19 through the first lead screw 18 matched with the internal thread in the rotating shaft 17 so as to conveniently take the injection-molded mold, drives the sleeve 23 to rotate through the second motor 22 so that the second lead screw 24 drives the mold upper body 4 to longitudinally move so as to realize the closing of the mold body, and injects water in the water tank 26 into the cooling pipe 7 through the first water pump 10 and the second water pump 13 so as to cool the mold body, thereby solving the problems of high temperature and slow cooling during mold taking and mold injection, and improving the injection molding efficiency of the injection mold.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.