Preparation method and preparation device of injection molded part

Abstract

The invention provides a preparation method and a preparation device of an injection molded part, and belongs to the technical field of machinery. The problem of poor stability in the prior art is solved. The preparation method of the injection molded part comprises the following steps: A, preheating supplied materials; b, injection molding; and C, punching and receiving. The preparation device for the injection molded part comprises a rack, a preheating feeding module, an injection molding module, a punching module and a transferring module are connected to the rack, and the preheating feeding module, the injection molding module and the punching module are circumferentially distributed with the transferring module as the reference. The transplanting module is a manipulator, a working end used for grabbing finished products or semi-finished products is arranged at the end of the manipulator, the working end comprises a support, an adsorption assembly and a clamping assembly, the adsorption assembly and the clamping assembly are connected to the support, the adsorption assembly is used for adsorbing raw materials, and the clamping assembly is used for clamping the semi-finished products subjected to injection molding. According to the preparation method of the injection molded part, raw materials or workpieces entering the next procedure can be kept at the set temperature, and meanwhile, the device is compact in structure.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a method for preparing an injection molded part and a preparation device thereof. Background Art

[0002] The injection molding preparation device is an efficient and precise manufacturing device for producing plastic products. The device injects molten plastic material into the mold and then cools and solidifies it to form the desired plastic product. The injection molding preparation system is widely used in many industries such as automobiles, electronics, medical, packaging, etc.

[0003] Usually, the injection molding device has multiple independent modules and a transfer module for correspondingly transferring the semi-finished products at each module. In the existing device, due to the existence of the transfer time during the operation of the transfer module, the temperature of the raw materials or semi-finished products after transfer is reduced. After the temperature of the raw materials or semi-finished products is reduced in the air, serious defects will occur when entering the next process. For example, the injection molding and encapsulation in the injection mold will not cause the product to debond, resulting in its poor stability. Summary of the invention

[0004] The first object of the present invention is to provide a method for preparing injection molded parts with high stability and high yield in view of the above-mentioned problems existing in the prior art.

[0005] The second object of the present invention is to provide a preparation device used in the method for preparing the injection molded part.

[0006] The first object of the present invention can be achieved by the following technical solutions: A method for preparing an injection molded part, wherein the injection molding device comprises a frame, and a preheating and feeding module, an injection molding module, a punching and cutting module and a transfer module are connected to the frame, wherein the preheating and feeding module, the injection molding module and the punching and cutting module are circumferentially distributed with the transfer module as a reference, and the method comprises the following steps: A. Preheating of incoming materials: The preheating feeding module has a feeding part, a heating part, a temperature measuring part and a transfer part. After the raw materials are fed into the feeding part, the raw materials at the feeding part are fed into the heating part for heating through the transfer part. After the temperature measuring part detects that the raw materials at the heating part are heated to the set temperature, the preheating feeding module sends a signal to enable the transfer module to take the materials; B. Injection molding: After the transfer module grabs the raw material of the set temperature and sends it to the injection molding module, the transfer module is reset, and the raw material of the set temperature is injection molded at the injection molding module to obtain a semi-finished product; C. Punching and collecting materials: The transplanting module grabs the semi-finished product and sends it to the punching module. The punching module separates the material head from the semi-finished product to obtain the finished product. Finally, the transplanting module sends the finished product to the finished product collection area. After the above operations are completed, the transplanting module enters the preheating and stripping module to resume its initial position.

[0007] After the heating unit heats the raw material in step A, the temperature of the heated raw material is 10-20 degrees higher than the mold temperature at the injection molding module.

[0008] The transplanting module is a six-axis manipulator.

[0009] The injection molding module includes an injection molding machine and a mold that can be loaded into the injection molding machine. In step B, the mold is inspected by a CCD camera to check whether the mold is normal and whether the semi-finished product in the mold is normal. If abnormal, a warning signal is issued.

[0010] The warning signal includes a flashing warning light or a buzzer sound alarm.

[0011] In step C, the mold transfer module moves from the front of the injection molding module to the top of the punching module. After confirming that the CCD photo is correct, that is, the punching module is in a clear state, the transfer module then places the semi-finished product into the punching module.

[0012] The cylinder moves downward and the product moves down. Then the mold robot moves down to the top of the lower die of the punch press, so that the head of the product after injection molding is within the guiding range of the guide pin and the lower end face of the product does not touch the die. Then release the six-axis robot clamp to make the product head slide into the die along the guide pin, and the product can smoothly enter the lower die cavity. The upper end face of the die cavity needs to provide a guiding function, such as an oblique guide or a circular guide, to avoid product jamming.

[0013] The operation process of the injection molding module in step B includes: mold closing, injection, pressure holding, cooling, mold opening, unloading from the transfer module, extension of the ejector pin and retraction of the ejector pin. After the transfer module obtains the notification signal of the mold opening process at the injection molding module, it moves to the injection molding module and is in a state to be grasped.

[0014] After the transplanting module receives the mold opening signal, the transplanting module moves to the injection molding module after a set time T1.

[0015] Set time T1 = injection time T2 + holding time T3 + cooling time T4 - transplanting module material taking time T5 + compensation time T6, where T2, T3, and T4 are the preset times during the injection molding operation of the injection molding machine, and T5 is the actual action timing of the transplanting module material taking action. The transplanting module material taking operation time is calculated or read with a stopwatch, and the compensation time T6 is 1.0 - 1.5s.

[0016] The second object of the present invention can be achieved by the following technical solutions: A device for preparing injection molded parts comprises a frame, to which a preheating and feeding module, an injection molding module, a punching module and a transfer module are connected, wherein the preheating and feeding module, the injection molding module and the punching module are circumferentially distributed with the transfer module as a reference, and is characterized in that the transfer module is a manipulator and has a working end at the end of the manipulator for grabbing finished products or semi-finished products, the working end comprises a bracket and an adsorption component and a clamping component connected to the bracket, the adsorption component is used to absorb raw materials, and the clamping component is used to clamp the semi-finished products of injection molding.

[0017] The number of the adsorption components is several and the several adsorption components are arranged in a straight line to form an adsorption unit. The clamping components are arranged in a one-to-one correspondence with the adsorption components and the several clamping components are arranged in a straight line to form a clamping unit. The adsorption unit is parallel to the clamping unit.

[0018] The adsorption assembly includes a driving member 1, an adsorption plate and a guide rod. The preheating and feeding module is provided with a guide hole directly opposite to the guide rod. The driving member 1 is fixedly connected to the bracket and the driving member 1 is connected to the adsorption plate. The guide rod is fixedly connected to the adsorption plate. When the working end is located directly above the transfer part of the preheating and feeding module, the driving member 1 drives the adsorption plate to move downward and the guide rod thereon can be embedded in the guide hole.

[0019] After the adsorption plate moves downward, there is a gap between the adsorption plate and the raw material.

[0020] The clamping assembly includes a second driving member, a third driving member and a claw. The second driving member is fixedly connected to the bracket, the third driving member is connected to the second driving member and the second driving member can drive the third driving member to move up and down, and the claw is connected to the third driving member and the third driving member can drive the claw to open and close.

[0021] The suction claw assembly is used to suck the incoming product from the heating part and put it into the mold cavity of the injection mold, and the clamping claw assembly is used to clamp the product that has been completed by injection molding and put it into the punching module. The suction claw assembly is suitable for picking up and placing the product with a slight deviation during the transfer process, while the clamping claw assembly is suitable for picking up and placing without deviation, or empty throwing. This part of the design can be reasonably replaced according to actual needs.

[0022] Compared with the prior art, the preparation method of the injection molded parts includes four modules, namely, a preheating and feeding module, an injection molding module, a punching and cutting module, and a transfer module. The preheating and feeding module heats the incoming product to a temperature 10-20 degrees higher than the temperature of the injection mold, so that when the transfer module takes and places the product, the temperature in the air is lowered and the product can be placed in the injection mold for injection molding and encapsulation without causing product degumming problems. Therefore, the product yield is effectively improved.

[0023] At the same time, the action time of the transplanting module in the preparation method of the injection molded parts is calculated according to a preset formula. When the transplanting unit drives the raw materials or semi-finished products to move in the air, it can try to avoid the raw materials or semi-finished products still having a relatively high set temperature when entering the next process after passing through the normal temperature air scene, thereby further improving its stability.

[0024] At the same time, in the preparation device of the injection molded parts, since the working end of the transplanting module has an adsorption component and a clamping component that can operate independently, the above two components are respectively picked up with the corresponding workpieces or semi-finished products, which effectively improves the applicability and stability, and the integration together also appropriately improves its structural compactness, which has a high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a principle block diagram of the preparation device of the injection molded parts.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure at the working end of the preparation device of the injection molded part.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the injection molded part preparation device at the working end in another direction.

[0028] Figure 4 It is the process flow chart at the injection molding module.

[0029] In the figure, 1, frame; 2, preheating feeding module; 2a, guide hole; 3, injection molding module; 4, punching module; 5, transplanting module; 6, working end; 6a, bracket; 6b, adsorption assembly; 6b1, driving part 1; 6b2, adsorption plate; 6b3, guide rod; 6c, clamping assembly; 6c1, driving part 2; 6c2, driving part 3; 6c3, claw. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly mounted on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0033] like Figure 1 As shown, the injection molding device includes a frame, to which a preheating and feeding module, an injection molding module, a punching and cutting module and a transfer module are connected, and the preheating and feeding module, the injection molding module and the punching and cutting module are circumferentially distributed with the transfer module as a reference. In this embodiment, the transfer module is a six-axis manipulator.

[0034] The method for preparing the injection molded part comprises the following steps: A. Preheating of incoming materials: The preheating feeding module has a feeding part, a heating part, a temperature measuring part and a transfer part. After the raw materials are fed into the feeding part, the raw materials at the feeding part are fed into the heating part for heating through the transfer part. After the temperature measuring part detects that the raw materials at the heating part are heated to the set temperature, the preheating feeding module sends a signal to enable the transfer module to take the materials; After the heating unit heats the raw material in step A, the temperature of the heated raw material is 10-20 degrees higher than the mold temperature at the injection molding module.

[0035] B. Injection molding: After the transfer module grabs the raw material of the set temperature and sends it to the injection molding module, the transfer module is reset, and the raw material of the set temperature is injection molded at the injection molding module to obtain a semi-finished product; The injection molding module includes an injection molding machine and a mold that can be loaded into the injection molding machine. In step B, the mold is inspected by a CCD camera to check whether the mold is normal and whether the semi-finished product in the mold is normal. If abnormal, a warning signal is issued.

[0036] The warning signal includes a flashing warning light or a buzzer sound alarm.

[0037] The operation process of the injection molding module in step B includes: mold closing, injection, pressure holding, cooling, mold opening, unloading from the transfer module, extension of the ejector pin and retraction of the ejector pin. After the transfer module obtains the notification signal of the mold opening process at the injection molding module, it moves to the injection molding module and is in a state to be grasped.

[0038] After the transplanting module receives the mold opening signal, the transplanting module moves to the injection molding module after a set time T1.

[0039] Set time T1 = injection time T2 + holding time T3 + cooling time T4 - transplanting module material taking time T5 + compensation time T6, where T2, T3, and T4 are the preset times during the injection molding operation of the injection molding machine, and T5 is the actual action timing of the transplanting module material taking action. The transplanting module material taking operation time is calculated or read with a stopwatch, and the compensation time T6 is 1.0 - 1.5s.

[0040] C. Punching and collecting materials: The transplanting module grabs the semi-finished product and sends it to the punching module. The punching module separates the material head from the semi-finished product to obtain the finished product. Finally, the transplanting module sends the finished product to the finished product collection area. After the above operations are completed, the transplanting module enters the preheating and stripping module to resume its initial position.

[0041] In step C, the mold transfer module moves from the front of the injection molding module to the top of the punching module. After confirming that the CCD photo is correct, that is, the punching module is in a clear state, the transfer module then places the semi-finished product into the punching module.

[0042] The transfer module drives the product down to the top of the stamping module, so that the head of the product after injection molding is within the guide range of the guide pin, and the lower end face of the product does not touch the stamping module. Then the clamping component allows the head of the product to slide into the stamping module along the guide pin, and the product can smoothly enter the lower die cavity. The upper end face of the stamping module needs to provide a guiding function, such as an oblique guide or a circular guide, to avoid product jamming.

[0043] like Figure 1 and Figure 2 and Figure 3 As shown, the preparation device of the injection molded parts includes a frame 1, and the frame 1 is connected with a preheating and feeding module 2, an injection molding module 3, a punching module 4 and a transfer module 5. The preheating and feeding module 2, the injection molding module 3, and the punching module 4 are circumferentially distributed with the transfer module 5 as a reference. The transfer module 5 is a manipulator and has a working end 6 for grabbing finished products or semi-finished products at the end of the manipulator. The working end 6 includes a bracket 6a and an adsorption component 6b and a clamping component 6c connected to the bracket 6a. The adsorption component 6b is used to absorb raw materials, and the clamping component 6c is used to clamp the semi-finished products of injection molding.

[0044] The number of the adsorption components 6b is several and the several adsorption components 6b are arranged in a straight line to form an adsorption unit. The clamping components 6c are arranged in a one-to-one correspondence with the adsorption components 6b and the several clamping components 6c are arranged in a straight line to form a clamping unit. The above-mentioned adsorption unit is parallel to the clamping unit.

[0045] The adsorption assembly includes a driving member 6b1, an adsorption disk 6b2 and a guide rod 6b3. The preheating and feeding module 2 has a guide hole 2a directly opposite to the guide rod 6b3. The driving member 6b1 is fixedly connected to the bracket 6a and the driving member 6b1 is connected to the adsorption disk 6b2. The guide rod 6b3 is fixedly connected to the adsorption disk 6b2. When the working end 6 is located directly above the transfer part of the preheating and feeding module 2, the driving member 6b1 drives the adsorption disk 6b2 to move downward, and then the guide rod 6b3 thereon can be embedded in the guide hole 2a.

[0046] After the adsorption plate 6b2 moves downward, there is a gap between it and the raw material.

[0047] The clamping assembly includes a second driving member 6c1, a third driving member 6c2 and a claw 6c3. The second driving member 6c1 is fixedly connected to the bracket 6a. The third driving member 6c2 is connected to the second driving member 6c1 and the second driving member 6c1 can drive the third driving member 6c2 to move up and down. The claw 6c3 is connected to the third driving member 6c2 and the third driving member 6c2 can drive the claw 6c3 to open and close.

[0048] In this embodiment, two groups of adsorption components and clamping claw components are installed on the working end 6. In this design, the adsorption component is used to absorb the incoming product from the heating part and put it into the mold cavity of the injection molding module, and the clamping claw component is used to clamp the product that has been completed by injection molding and film coating and put it on the lower mold of the punching module. The adsorption component is suitable for picking up and placing the product with a slight deviation during the transfer process, while the clamping claw is suitable for picking up and placing without deviation, or empty throwing. This part of the design can be reasonably replaced according to actual needs. The adsorption component starts vacuum suction, and the driving part drives the adsorption component to move downward to about 0.2-0.3mm away from the upper surface of the product. Through the air gap of 0.2 - 0.3mm, the product is adsorbed below the suction port instead of the suction port directly hitting the product surface.

[0049] Then, through the negative pressure gauge, after the suction plate confirms that the negative pressure value reaches between -0.60 and -0.80 MPa, the product confirms that the suction is successful, and the transfer unit lifts the product and then moves it to the injection molding machine to wait. The negative pressure gauge mentioned here must ensure that the negative pressure value can satisfy the absorption of all products. If there is leakage during absorption, consider reducing the number of products corresponding to the negative pressure, appropriately increase the negative pressure gauge and negative pressure source, and ensure that the products at each acupoint can be absorbed completely without falling.

[0050] When the adsorption component of the transplanting module absorbs the incoming material, the adsorption component is required to move downward and the guide rod is inserted into the guide hole. At this time, the lower surface of the clamping component and the upper surface of the heating platform are 0.50mm apart and do not touch each other. Then the lower ejector pins of the heating platform are lifted up at the same time through the cylinder.

[0051] Put the product into the injection molding module. The specific action is to move the transfer unit close to the injection molding module, position it through the guide rod in the transfer unit, and push the incoming material into the injection molding module. This action requires stability and the cylinder movement speed must be adjusted appropriately to ensure that the incoming material is placed in the injection molding module normally.

[0052] The mold also needs to provide a guiding function, such as a guide rod end having a smoothly transitioned guide part 1, and a guide hole upper end having a smoothly transitioned guide part 2. Both guide part 1 and guide part 2 are oblique guide or circular guide structures to avoid product jamming.

[0053] In addition, when the adsorption component is pushed forward to the front limit, the front end face of the product is 0.1mm-0.2mm away from the injection molding module and will not hit the injection molding module. Then the vacuum adsorption of the mold robot stops, the vacuum of the injection mold is turned on, and the product is sucked from the adsorption port of the robot to the mold surface.

[0054] When the mold vacuum pressure value reaches the standard, the transfer module exits the injection molding module, and then the in-mold inspection CCD takes a photo to confirm that the product has been normally placed in the mold cavity of the injection molding module. The injection molding module then closes the mold and starts the injection molding cycle.

[0055] After the six-axis robot for the injection mold takes and places the product into the injection mold, it will take a CCD photo of the mold. When the CCD photo of the mold is normal, the action flow will be carried out according to the "Operation Flow Chart"; if the CCD photo of the mold is NG, the injection molding "NG" action flow will be followed; when the CCD photo of the mold is NG, the CCD will send a photo NG signal, and the injection molding machine, as the main control end, will receive the photo NG signal for confirmation, and then the injection molding machine will send an alarm demand. When the six-axis robot for the injection mold receives the alarm demand, the alarm light will be triggered, the alarm light will flash, the injection molding machine and the six-axis robot for the mold will stop, and the manual semi-automatic processing will be switched to manually eliminate the abnormality. In the manual processing, confirm whether there are any injection molded parts left in the mold, and remove them in time, and then make a fake embryo confirmation according to the engineering requirements, that is, make a re-confirmation of the first piece, if there is no abnormality, reset, and manually switch to automatic mode to run the injection molding full-automatic cycle.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A method for preparing an injection molded part, the injection molding device comprising a frame (1), the frame (1) being connected with a preheating and feeding module (2), an injection molding module (3), a punching module (4) and a transfer module (5), the preheating and feeding module (2), the injection molding module (3) and the punching module (4) being circumferentially distributed with the transfer module (5) as a reference, characterized in that: The method comprises the following steps: A. Preheating of incoming materials: The preheating feeding module (2) has a feeding section, a heating section, a temperature measuring section and a transfer section. After the raw materials are fed into the feeding section, the raw materials at the feeding section are fed into the heating section for heating through the transfer section. After the temperature measuring section detects that the raw materials at the heating section are heated to a set temperature, the preheating feeding module (2) sends a signal to cause the transfer module (5) to move and take the materials. B. Injection molding: After the transfer module (5) grabs the raw material at the set temperature and sends it to the injection molding module (3), the transfer module (5) is reset, and the raw material at the set temperature is injection molded at the injection molding module (3) to obtain a semi-finished product; C. Punching and collecting materials: The transplanting module (5) grabs the semi-finished product and sends it to the punching module (4). The punching module (4) separates the material head from the semi-finished product to obtain a finished product. Finally, the transplanting module (5) sends the finished product to the finished product collection area. After the above operation is completed, the transplanting module (5) enters the preheating and stripping module (2) to resume its initial position.

2. The method for preparing an injection molded part according to claim 1, characterized in that: After the heating unit heats the raw material in step A, the temperature of the heated raw material is 10-20 degrees higher than the mold temperature at the injection molding module (3).

3. The method for preparing an injection molded part according to claim 2, characterized in that: The transplanting module (5) is a six-axis manipulator.

4. The method for preparing an injection molded part according to claim 3, characterized in that: The injection molding module (3) comprises an injection molding machine and a mold that can be loaded into the injection molding machine. In step B, the mold is inspected by a CCD camera to check whether the mold is normal and whether the semi-finished product in the mold is normal. If abnormal, a warning signal is issued.

5. The method for preparing an injection molded part according to claim 4, characterized in that: The warning signal includes a flashing warning light or a buzzer sound alarm.

6. The method for preparing an injection molded part according to claim 5, characterized in that: In step C, the mold transfer module (5) moves from the front of the injection molding module to the top of the punching module (4). After confirming that the CCD photo is correct, that is, the punching module is in a clear state, the transfer module (5) then places the semi-finished product into the punching module (4).

7. The method for preparing an injection molded part according to claim 6, characterized in that: The operation process of the injection molding module (3) in step B includes: mold closing, injection, pressure holding, cooling, mold opening, unloading from the transfer module, push rod extension and push rod retraction. After the transfer module (5) obtains the notification signal of the mold opening process at the injection molding module (3), it moves to the injection molding module (3) and is in a state to be grasped.

8. The method for preparing an injection molded part according to claim 7, characterized in that: After the transplanting module (5) receives the mold opening signal, the transplanting module (5) moves to the injection molding module (3) after a set time T1, where the set time T1 = injection time T2 + pressure holding time T3 + cooling time T4 - transplanting module material taking time T5 + compensation time T6, wherein T2, T3, and T4 are preset times during the injection molding operation of the injection molding machine, T5 is the actual action timing of the transplanting module taking material, and the transplanting module taking material operation time is calculated or read using a stopwatch, and the compensation time T6 is 1.0-1.5s.

9. A device for preparing injection molded parts according to claim 1, comprising a frame, wherein the frame (1) is connected with a preheating and feeding module (2), an injection molding module (3), a punching module (4) and a transfer module (5), wherein the preheating and feeding module (2), the injection molding module (3) and the punching module (4) are circumferentially distributed with the transfer module (5) as a reference, and characterized in that: The transplanting module (5) is a manipulator and has a working end (6) at the end of the manipulator for grasping a finished product or a semi-finished product. The working end (6) comprises a bracket (6a) and an adsorption component (6b) and a clamping component (6c) connected to the bracket (6a). The adsorption component (6b) is used to absorb raw materials, and the clamping component (6c) is used to clamp the semi-finished product molded by injection molding.

10. The device for preparing injection molded parts according to claim 9, characterized in that: The number of the adsorption components (6b) is a plurality and the plurality of adsorption components (6b) are arranged in a straight line to form an adsorption unit; the clamping components (6c) are arranged in a one-to-one correspondence with the adsorption components (6b) and the plurality of clamping components (6c) are arranged in a straight line to form a clamping unit; the adsorption unit is parallel to the clamping unit.

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