Plastic injection molding process

By introducing anti-deformation structures and ventilation grooves into the injection molding equipment, the problem of poor anti-deformation effect of plastic workpieces in the screw injection molding machine is solved, and higher finished product integrity and quality stability are achieved.

CN114589873BActive Publication Date: 2024-12-20NINGBO FLY MEDICAL PROD CO LTD
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Patent Information

Application Number
CN202210251692.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-03-15
Publication Date
2024-12-20
Estimated Expiration
2042-03-15

AI Technical Summary

Technical Problem

Conventional screw injection molding machines have poor anti-deformation effect on plastic workpieces, resulting in the finished product being prone to deformation defects.

Method used

An anti-deformation injection molding equipment was designed, including fixed beam frames, movable beam frames, ejection plates, movable formwork, fixed formwork, thimble and ventilation grooves. By controlling the structure of the mold and cooling waterway, the deformation of the plastic workpieces when they are pushed out is reduced. , the ventilation grooves are used to maintain the balance of internal and external air pressure, avoid depression and deformation, and ensure the integrity of the finished product through a specific runner design and material collection mechanism.

Benefits of technology

It effectively improves the anti-deformation performance of plastic workpieces, reduces the deformation defects of the finished product, and ensures the shape integrity and quality stability of the finished product.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention belongs to the technical field of injection molding, and specifically, is a plastic injection molding process; the process comprises the following steps: S1: preparing materials, setting injection molding machine parameters, including screw position parameters, injection pressure, holding pressure and holding pressure; S2: debugging a screw extruder, starting the screw extruder and moving it to the injection port on an anti-deformation injection molding device, and keeping the injection port horizontal; S3: closing the mold for injection molding; S4: cooling, after the injection is completed, cooling the plastic material for a period of time through cooling water channels in a movable mold plate and a fixed mold plate; S5: opening the mold to take out materials, and taking out the residual materials in the flow channel together with the formed workpiece by utilizing the shape of the flow channel formed by the movable mold plate and the fixed mold plate; S6: removing the residual materials on the formed workpiece and storing them in a warehouse; the anti-deformation injection molding device comprises a fixed beam frame, a movable beam frame, an ejector plate, a movable mold plate, a fixed mold plate, an ejector pin and a venting groove; and is used to improve the anti-deformation effect on the plastic workpiece.
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Description

Technical Field

[0001] The invention belongs to the technical field of injection molding, and specifically relates to a plastic injection molding process. Background Art

[0002] Plastic injection molding is a method of making plastic products. It uses pressure to inject molten plastic into a plastic product mold, which is cooled and formed to obtain various plastic parts. Screw injection molding machines are common on the market. The plasticizing device of the screw injection molding machine is mainly composed of a feeding device, a barrel, a screw, a coating component and a nozzle. The power transmission device includes an injection cylinder, an injection seat moving cylinder and a screw transmission device. However, conventional screw injection molding machines have poor anti-deformation effects on plastic workpieces. Summary of the invention

[0003] In order to achieve the purpose of improving the anti-deformation effect on plastic workpieces, the present invention adopts the following technical solutions:

[0004] The present invention provides a plastic injection molding process, comprising the following steps:

[0005] S1: Prepare materials and set injection molding machine parameters, including screw position parameters, injection pressure, holding pressure and pressure retention;

[0006] S2: Debug the screw extruder, start the screw extruder and move it to the injection port on the anti-deformation injection molding equipment, and keep the injection port horizontal;

[0007] S3: Mold closing and injection molding, after the movable mold plate and the fixed mold plate are pressed against each other, the molten plastic material is injected into the molding flow channel;

[0008] S4: Cooling: After the injection is completed, the plastic material is cooled for a period of time through the cooling water channels in the movable mold plate and the fixed mold plate;

[0009] S5: Open the mold and take out the material. Using the shape of the flow channel formed by the movable mold plate and the fixed mold plate, the remaining material in the flow channel and the formed workpiece are taken out together;

[0010] S6: Remove the residual material from the formed workpiece and store it in the warehouse.

[0011] The anti-deformation injection molding equipment comprises a fixed beam, a movable beam, an ejector plate, a movable template, a fixed template, an ejector pin and a venting groove, wherein the fixed beam is fixedly connected to a horizontal mold clamping frame, the movable beam is slidably connected to the horizontal mold clamping frame, the movable beam is slidably connected to an ejector plate, a movable template is mounted on the ejector plate, the movable template and the fixed template mounted on the fixed beam can be abutted and matched to form a plastic workpiece molding space, an ejector pin capable of penetrating the movable template is mounted on the ejector plate, and a venting groove for reducing defects when the plastic workpiece is ejected is provided on the ejector pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following drawings are intended only to illustrate and explain the present invention, wherein:

[0013] Figure 1 It is a flow chart of the plastic injection molding process of the present invention;

[0014] Figure 2 The structure diagram of the anti-deformation injection molding device of the present invention is shown in FIG. Figure 1 ;

[0015] Figure 3 The structure diagram of the anti-deformation injection molding device of the present invention is shown in FIG. Figure 2 ;

[0016] Figure 4 It is a structural schematic diagram of the movable beam frame and the ejection plate of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the guide rod and the top plate of the present invention;

[0018] Figure 6 It is a structural schematic diagram of the workpiece and flow channel residual material of the present invention;

[0019] Figure 7 It is a structural schematic diagram of the pull column frame and the guide plate of the present invention;

[0020] Figure 8 It is a structural schematic diagram of the positioning frame of the present invention;

[0021] Fig. 9 It is a structural schematic diagram of the injection molding port of the present invention;

[0022] Fig.10 It is a structural schematic diagram of the transmission plate of the present invention;

[0023] Fig.11 It is a structural schematic diagram of the material taking arm of the present invention;

[0024] Fig.12 It is a schematic structural diagram of the moving rod and the transmission wheel shaft of the present invention. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are described below.

[0026] A plastic injection molding process comprises the following steps:

[0027] S1: Prepare materials and set injection molding machine parameters, including screw position parameters, injection pressure, holding pressure and pressure retention;

[0028] S2: Debug the screw extruder, start the screw extruder and move it to the injection port on the anti-deformation injection molding equipment, and keep the injection port horizontal;

[0029] S3: Mold closing and injection molding, after the movable mold plate and the fixed mold plate are pressed against each other, the molten plastic material is injected into the molding flow channel;

[0030] S4: Cooling: After the injection is completed, the plastic material is cooled for a period of time through the cooling water channels in the movable mold plate and the fixed mold plate;

[0031] S5: Open the mold and take out the material. Using the shape of the flow channel formed by the movable mold plate and the fixed mold plate, the remaining material in the flow channel and the formed workpiece are taken out together;

[0032] S6: Remove the residual material from the formed workpiece and store it in the warehouse.

[0033] After the residual material in the flow channel is removed together with the formed workpiece, it is hung for a period of time and then dropped into the collection box to prevent the incompletely cooled plastic workpiece from being compressed and deformed during the falling process.

[0034] See Figure 2-6 As shown:

[0035] The anti-deformation injection molding equipment includes a fixed beam 1-1, a movable beam 1-2, an ejector plate 1-3, a movable template 1-5, a fixed template 1-6, an ejector pin 3-4 and a venting groove 3-5. The horizontal mold clamping frame is installed on the workbench. The fixed beam 1-1 is fixedly connected to the horizontal mold clamping frame. The movable beam 1-2 is slidably connected to the horizontal mold clamping frame. The ejector plate 1-3 is slidably connected to the movable beam 1-2. The ejector plate 1-3 is installed with a movable template 1-5. The movable template 1-5 and the fixed template 1-6 installed on the fixed beam 1-1 can abut and cooperate to form a plastic workpiece molding space. The ejector plate 1-3 is installed with a plurality of ejector pins 3-4 that can penetrate the movable template 1-5. The ejector pins 3-4 are provided with a plurality of venting grooves 3-5. The venting grooves 3-5 are provided with venting grooves 3-5 for reducing defects when the plastic workpiece is pushed out.

[0036] The anti-deformation injection molding device and the screw extruder installed on the horizontal clamping frame together constitute the injection molding machine;

[0037] The movable beam frame 1-2 is slidably connected to the horizontal clamping frame, which is convenient for replacing different types of ejector plates 1-3 and movable mold plates 1-5, and also for facilitating full cleaning of the interior of the equipment;

[0038] After the movable template 1-5 and the fixed template 1-6 are controlled to abut against each other, a plastic workpiece molding space is formed, and the molten plastic material is injected into the plastic workpiece molding space to complete the molding process of the plastic workpiece. Then, the plastic material is cooled through the cooling water channels in the movable template 1-5 and the fixed template 1-6. After cooling for a period of time, the mold is opened, and then the plastic workpiece is ejected through the ejector pin 3-4. The setting of the venting groove 3-5 can reduce the fit between the plastic workpiece and the movable template 1-5 and the ejector pin 3-4, maintain the balance of internal and external air pressure, and avoid the plastic workpiece from being dented and deformed during ejection;

[0039] The vent groove 3-5 is located at one end of the ejector pin 3-4, and can maintain the sealing when the molten plastic is injected;

[0040] The length of the ventilation groove 3-5 is longer than the thickness of the dynamic template 1-5, so that the amount of air circulation is increased.

[0041] See Figure 2-5 As shown:

[0042] The anti-deformation injection molding equipment also includes a side fixing plate 3-1 and a guide rod 3-2. The ejection plate 1-3 is detachably fixedly connected to the side fixing plate 3-1, and multiple guide rods 3-2 are fixedly connected to the side fixing plate 3-1. The movable template 1-5 is installed on the multiple guide rods 3-2.

[0043] The side fixing plate 3-1 is detachably fixedly connected to the ejection plate 1-3, and multiple side fixing plates 3-1 are fixedly connected. The movable template 1-5 is fixedly connected to multiple guide rods 3-2. At this time, the fixed template 1-6 is slidingly connected to the multiple guide rods 3-2. The fixed template 1-6 is aligned and slidably connected with the multiple guide rods 3-2, which facilitates the positioning of the fixed beam frame 1-1 and the movable beam frame 1-2.

[0044] See Figure 3 and Figure 5 As shown:

[0045] The anti-deformation injection molding equipment also includes a top plate 3-3 and a positioning pin 3-6. The top plate 3-3 is slidably connected to the side fixed plate 3-1, and the ejector pin 3-4 is fixedly connected to the top plate 3-3. A spring I is fixedly connected between the top plate 3-3 and the movable template 1-5. The positioning pin 3-6 is fixedly connected to the movable beam 1-2, and the positioning pin 3-6 is in contact with one side of the top plate 3-3.

[0046] Under normal conditions, the ends of the ejector pins 3-4 are kept flush with the surface of the movable plate 1-5;

[0047] The top plate 3-3 is in a T-shaped structure and is clamped on the side fixing plate 3-1. The top plate 3-3 and the side fixing plate 3-1 are slidably connected;

[0048] The ejector plate 1-3 is controlled to move on the movable beam 1-2 to realize the mold opening process, and the ejector plate 1-3 is continued to be moved, so that the positioning pin 3-6 can contact with the top plate 3-3 and tighten the top plate 3-3, so that the ejector pin 3-4 protrudes from the driven template 1-5, and the ejection process of the workpiece from the driven template 1-5 is completed.

[0049] See Figure 6 and Fig. 9 As shown:

[0050] The anti-deformation injection molding equipment also includes a workpiece 2-1, runner residue 2-2 and runner 2-3. The fixed mold plate 1-6 is provided with a runner 2-3. The molten plastic forms a workpiece 2-1 with runner residue 2-2 in the plastic workpiece molding space between the runner 2-3 and the movable mold plate 1-5 and the fixed mold plate 1-6.

[0051] A flow channel residue 2-2 is provided on the workpiece 2-1, and a cylindrical section and a conical section with a smaller diameter are provided on the flow channel residue 2-2;

[0052] The tapered section can increase the plastic injection effect, and the tapered design facilitates the removal of the runner residue 2-2;

[0053] A buffer arc is provided at the connection between the cylindrical section and the conical section to avoid sticking to the mold.

[0054] See Fig. 9 As shown:

[0055] The anti-deformation injection molding equipment also includes an injection molding port 2-4, and the fixed mold plate 1-6 is provided with an injection molding port 2-4 that can be embedded with the extrusion port of the screw extruder.

[0056] The injection port 2 - 4 is tapered and is engaged with the extrusion port of the screw extruder.

[0057] See Figure 7-8 As shown:

[0058] The anti-deformation injection molding equipment also includes a pulling column frame 4-1 and a guide plate 4-2. The fixed template 1-6 is composed of two half templates spliced ​​together, which are used to increase the cross-sectional size of the flow channel 2-3 on the side close to the plastic workpiece molding space. The half template is fixedly connected to the fixed beam frame 1-1 through the guide plate 4-2, and the guide plate 4-2 is slidably connected to the guide rod 3-2. The pulling column frame 4-1 is installed on the fixed template 1-6, and the pulling column frame 4-1 is slidably connected to the guide plate 4-2. A tension spring is installed between the pulling column frame 4-1 and the guide plate 4-2.

[0059] The fixed template 1-6 is composed of two half templates, and the guide plate 4-2 is used to slide on the guide rod 3-2 to achieve the guiding and positioning functions. Then, by changing the distance between the pull column frame 4-1 and the guide plate 4-2, the half template is kept sliding on the guide plate 4-2 in a fitted state, so that the flow channel residue 2-2 whose cross-sectional diameter changes with the length position can be completely removed.

[0060] See Figure 7-8 As shown:

[0061] The anti-deformation injection molding equipment also includes a positioning frame 6-1 and a convex edge 6-2. The positioning frame 6-1 is installed on the movable template 1-5, and the positioning frame 6-1 is provided with a convex edge 6-2. The positioning frame 6-1 and the convex edge 6-2 are used to cooperate with the pull column frame 4-1 when opening the mold to move the runner residue 2-2 out from between the two fixed templates 1-6.

[0062] During the mold opening process, the convex edge 6-2 lifts the pull column frame 4-1, so that the two half templates move away from each other, so that the flow channel residue 2-2 whose cross-sectional diameter varies with the length position can be completely removed, increasing the continuous processing performance of the equipment and facilitating the clamping and separation of the workpiece and the residue.

[0063] See Figure 6 As shown:

[0064] The bending parts of the convex edges 6 - 2 are all provided with buffer arc edges.

[0065] The setting of the buffer arc edge can increase the anti-collision effect of the re-fastening between the two half templates.

[0066] See Figure 2-5 As shown:

[0067] The anti-deformation injection molding equipment also includes a connecting frame 1-4, and two sliding columns slidably connected to the movable beam frame 1-2 are installed on the ejection plate 1-3, and the connecting frame 1-4 is installed on the two sliding columns.

[0068] A hydraulic cylinder is installed between the connecting frame 1-4 and the movable beam frame 1-2, and the hydraulic cylinder can control the sliding column to slide on the movable beam frame 1-2.

[0069] See Figure 10-12 As shown:

[0070] The anti-deformation injection molding equipment also includes a slot plate 1-7, a moving rod 5-1, a material picking rack 5-4, a material picking arm 5-5 and a clamping groove 5-6. The movable beam frame 1-2 is fixedly connected with the slot plate 1-7, the moving rod 5-1 is slidably connected with the slot plate 1-7, the material picking rack 5-4 is installed on the moving rod 5-1, and a plurality of material picking arms 5-5 are installed on the side of the material picking rack 5-4. The material picking arm 5-5 is provided with a clamping groove 5-6, and the clamping groove 5-6 can clamp and hold the flow channel residual material 2-2.

[0071] An electric push rod is installed between the movable beam frame 1-2 and the moving rod 5-1. The electric push rod can drive the moving rod 5-1 to slide on the groove plate 1-7. During the mold opening process, the clamping groove 5-6 on the material picking arm 5-5 clamps the cylindrical section of the runner residual material 2-2, and then the ejection plate 1-3 continues to move to make the plastic material hang on the clamping groove 5-6, and the electric push rod is started to reset to complete the material picking process.

[0072] See Figure 10-12 As shown:

[0073] The anti-deformation injection molding equipment also includes a transmission plate 3-7, a transmission axle 5-2 and a top ring 5-3, the top plate 3-3 is fixedly connected with the transmission plate 3-7, the transmission plate 3-7 and the transmission axle 5-2 can be connected or staggered by friction transmission, the material picking frame 5-4 is installed on the moving rod 5-1 through the transmission axle 5-2, the transmission axle 5-2 is fixedly connected to the material picking frame 5-4, the transmission axle 5-2 is rotatably connected to the moving rod 5-1, the transmission axle 5-2 is slidably connected with the top ring 5-3, a spring II is installed between the top ring 5-3 and the transmission axle 5-2, the top ring 5-3 and the moving rod 5-1 are tightly connected, a limiting arm is installed on the movable beam frame 1-2, which can move the plastic workpiece clamped on the material picking arm 5-5 away from the side of the movable beam frame 1-2 during the rotation of multiple material picking arms 5-5, so that the workpiece body is disconnected from the flow channel residual material 2-2.

[0074] By moving the side fixing plate 3-1, the top plate 3-3 can be connected or staggered with the transmission plate 3-7 and the transmission wheel shaft 5-2 through friction transmission during the movement. While maintaining the transmission state, the material picking arm 5-5 can rotate 90° after clamping a plastic workpiece to lift the plastic workpiece. Then the top plate 3-3 is reset to stagger the transmission plate 3-7 and the transmission wheel shaft 5-2. After three material picking cycles, the plastic workpiece can fall into the collection box.

[0075] Furthermore, the limiting arm can be used to disconnect the workpiece body from the flow channel residue 2-2. Since the clamping groove 5-6 is clamped on the cylindrical section of the flow channel residue 2-2, the workpiece body and the flow channel residue 2-2 can be disconnected by displacement.

Claims

1. A plastic injection molding anti-deformation injection molding equipment, characterized in that: The anti-deformation injection molding equipment comprises a fixed beam frame (1-1) and a movable beam frame (1-2); the fixed beam frame (1-1) is fixedly connected to a horizontal mold clamping frame; the movable beam frame (1-2) is slidably connected to the horizontal mold clamping frame; an ejection plate (1-3) is slidably connected to the movable beam frame (1-2); a movable template (1-5) is installed on the ejection plate (1-3); the movable template (1-5) and a fixed template (1-6) installed on the fixed beam frame (1-1) can be abutted and matched to form a plastic workpiece molding space; an ejector pin (3-4) capable of penetrating the movable template (1-5) is installed on the ejection plate (1-3); and a venting groove (3-5) is provided on the ejector pin (3-4) for reducing defects when the plastic workpiece is ejected; The length of the ventilation groove (3-5) is longer than the thickness of the movable template (1-5), so that the amount of air circulation is increased; The ejection plate (1-3) is mounted with a side fixing plate (3-1), a plurality of guide rods (3-2) are mounted on the side fixing plate (3-1), and the movable plate (1-5) is mounted on the plurality of guide rods (3-2); The side fixed plate (3-1) is slidably connected to a top plate (3-3), an ejector pin (3-4) is fixedly connected to the top plate (3-3), a spring I is installed between the top plate (3-3) and the movable template (1-5), a positioning pin (3-6) is installed on the movable beam frame (1-2), and the positioning pin (3-6) is in contact with one side of the top plate (3-3); The fixed die plate (1-6) is provided with a flow channel (2-3), and the molten plastic forms a workpiece (2-1) with flow channel residue (2-2) in a plastic workpiece molding space between the flow channel (2-3) and the movable die plate (1-5) and the fixed die plate (1-6); The fixed mold plate (1-6) is provided with an injection port (2-4) that can be engaged with the extrusion port of the screw extruder; The fixed template (1-6) is composed of two half templates spliced ​​together, and is used to increase the cross-sectional size of the flow channel (2-3) on the side close to the plastic workpiece molding space; the half template is fixedly connected to the fixed beam frame (1-1) via a guide plate (4-2); the guide plate (4-2) is slidably connected to the guide rod (3-2); a pull column frame (4-1) is installed on the fixed template (1-6); the pull column frame (4-1) is slidably connected to the guide plate (4-2); and a tension spring is installed between the pull column frame (4-1) and the guide plate (4-2); A positioning frame (6-1) is installed on the movable mold plate (1-5), and a convex edge (6-2) is provided on the positioning frame (6-1). The positioning frame (6-1) and the convex edge (6-2) are used to cooperate with the pull column frame (4-1) when opening the mold to move the runner residual material (2-2) out from between the two fixed mold plates (1-6).

2. The device according to claim 1, characterized in that: The bending parts of the convex edges (6-2) are all provided with buffer arc edges.

3. The device according to claim 1, characterized in that: The ejection plate (1-3) is provided with two sliding columns which are slidably connected to the movable beam frame (1-2), and the two sliding columns are provided with a connecting frame (1-4).