Injection molding method of special-shaped connector clip

Abstract

The invention belongs to the technical field of special-shaped plug connectors, and discloses an injection molding method of a special-shaped plug connector, which comprises the following steps: selecting plastic raw materials of the special-shaped plug connector: the plastic raw materials comprise a base material, a reinforcing material, a plasticizer and a light stabilizer, the base material is polystyrene, the reinforcing material is glass fiber and carbon fiber, the plasticizer is a cycloolefin plasticizer, and the light stabilizer is a light stabilizer; the injection molding machine is filled with the plastic raw materials for melting, and the mold is designed to be the round water gap and arranged at the flowing position of the plastic through the cooperation of the round water gap, the exhaust channel, the pneumatic core-pulling mechanism and the demolding inclination, so that the appearance of a molded product is prevented from being influenced; the pneumatic core-pulling mechanism comprises an air cylinder, a piston, an air pipe and a valve, the temperature of cooling water of the injection mold is 20-30 DEG C, a pouring gate is a hot runner pouring gate, accumulation of cold materials can be reduced, waste can be reduced, the production efficiency is improved, the demolding inclination is 1-3 degrees, and mold clamping and damage of products are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of special-shaped connectors, and specifically relates to an injection molding method for special-shaped connectors. Background Technique

[0002] A special-shaped connector is a connector designed according to specific requirements, usually used to connect components with different shapes and structures. Such connectors are widely used in the fields of machinery, electronics, electricity, and automobiles. Their characteristics are that the shapes, sizes, and design forms of the plug-in components are usually irregular and meet specific structural requirements in order to effectively connect with other supporting components. Special-shaped connectors have a load-bearing capacity to ensure the stability of the connection part. Through the plug-in method, rapid assembly and disassembly can be easily achieved. Injection molding is a common manufacturing process widely used in the production of plastic products. In this process, molten plastic is injected into a mold with a specific shape, and the plastic is cooled and solidified to form the required parts and products.

[0003] However, an existing injection molding method for special-shaped connectors is not perfect and still has certain defects:

[0004] During the production of special-shaped connectors by an injection mold, subsequent demolding is required. However, there is no demolding slope between the connector and the mold, and the formed parts will have a strong adhesion force in the mold. The parts will be stuck by the mold, resulting in difficult demolding and even damage to the parts. In addition, there is no circular water inlet. During the filling process, the plastic will be hindered by air resistance and water vapor, forming bubbles, voids, and surface defects, which affect the product quality. The accumulation of gas and moisture will also cause uneven cooling, thereby affecting the curing process of the parts. Therefore, an injection molding method for special-shaped connectors is designed. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection molding method for special-shaped connectors to solve the problems mentioned in the above background technique, namely, there is no demolding slope between the connector and the mold, the formed parts will have a strong adhesion force in the mold, the parts will be stuck by the mold, resulting in difficult demolding, and the plastic will be hindered by air resistance and water vapor during the filling process, forming bubbles, voids, and surface defects.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An injection molding method for special-shaped connectors, including the following injection molding steps:

[0007] S1. Raw Material Selection

[0008] Selection of plastic raw materials for special-shaped connectors: The plastic raw materials include a base material, a reinforcing material, a plasticizer, and a light stabilizer. The base material is polystyrene, the reinforcing materials are glass fiber and carbon fiber, the plasticizer is a cycloolefin plasticizer, and the light stabilizer is a UV absorber. The plastic raw materials are filled into the interior of an injection molding machine for melting;

[0009] S2. Injection molding and holding pressure

[0010] Select a multi-cavity mold, which can improve production efficiency. The mold is designed with a slider and a core-pulling mechanism to ensure smooth demolding;

[0011] The injection molding machine injects the plastic raw materials into the mold for molding. The screw of the injection molding machine pushes the heated and melted plastic material to the injection port of the mold. When injecting into the mold, the plastic fills the cavity and all the detailed areas inside the mold. During this process, the mold must be kept closed to prevent plastic leakage;

[0012] S3. Mold clamping

[0013] The injection molding machine aligns the two parts (cavity and core) of the mold to form a sealed mold cavity. The injection molding machine aligns the cavity and core of the mold through the mold guiding device to ensure uniform plastic flow during molding;

[0014] The mold is tightly closed by the mold clamping device of the injection molding machine to withstand the pressure during the injection molding process;

[0015] S4. Cooling and shaping

[0016] The cooling channels in the mold are close to the cavity to ensure cooling efficiency. The layout of the cooling channels avoids dead ends to prevent dimensional deformation caused by uneven cooling. Cooling water flows inside the cooling channels;

[0017] S5. Mold opening

[0018] After the connector is cooled and shaped, the mold is opened to open the cavity and core for subsequent demolding;

[0019] S6. Demolding and cleaning

[0020] A demolding slope is designed on the surface of the connector, and a demolding mechanism is used for demolding according to the shape of the connector;

[0021] Exhaust channels are provided in the mold to prevent gas from forming bubbles during the injection molding process and improve product quality;

[0022] The plastic overflowed during the injection molding process needs to be cleaned up, including the gate and runner. The burrs of the product are cleaned and polished using equipment;

[0023] S7. Removing the sprue

[0024] The mold is designed with a round gate, which is set at the position where the plastic flows, so as not to affect the appearance of the molded product;

[0025] During the injection molding process, the plastic melt is injected into the mold through the nozzle of the injection molding machine. The gate channel is responsible for guiding the molten plastic into the mold cavity. The gate is the "channel" through which the plastic flows into the mold;

[0026] Use the cutting device installed on the mold, and the automatic gate cutting equipment is used for cutting. After removing the gate, the gate part of the molded part is polished and buffed;

[0027] S8. Store the qualified finished products in the warehouse

[0028] Check the dimensions and tolerances of the connector through precision measuring tools; test the insertion performance of the connector to ensure the reliability and stability of the connector; after the quality of a single connector is qualified, it is packaged by batch to ensure protection during transportation.

[0029] Preferably, the ratio of the base material, reinforcing material, plasticizer and light stabilizer is 6:1:2:1. The glass fiber can improve the tensile strength, flexural strength and temperature resistance of the plastic, and the plasticizer improves the plasticity and molding performance of the plastic.

[0030] Preferably, the mold closing speed is 50 mm / s - 150 mm / s, which can reduce the impact force and ensure smooth mold closing.

[0031] Preferably, the draft angle is 1° - 3°, to avoid product sticking in the mold and damage. The demolding mechanism includes a pneumatic core-pulling mechanism.

[0032] Preferably, the pneumatic core-pulling mechanism includes a cylinder, a piston, an air pipe and a valve. The cylinder uses the pressure of compressed air to drive the piston to move, thereby driving the movement of the core-pulling assembly. Before molding, the pneumatic core-pulling mechanism starts to work. When compressed air is introduced into the cylinder, the piston inside the cylinder moves forward, driving the core rod to be pulled out from the mold cavity.

[0033] Preferably, the cooling water temperature of the injection mold is between 20°C and 30°C. The gate is a hot runner gate, which can reduce the accumulation of cold material, reduce waste and improve production efficiency. The gate position is set at the position with the largest thickness of the product to avoid uneven filling caused by the thin-walled part being filled first.

[0034] The beneficial effects of the present invention are as follows:

[0035] Through the cooperation of the circular nozzle, exhaust channel, pneumatic core-pulling mechanism and demoulding slope set in the present invention, the mould is designed with a circular nozzle, which is set at the position of plastic flow to avoid affecting the appearance of the molded product. An exhaust channel is opened in the mould to prevent gas from forming bubbles during injection molding and improve the product quality. The pneumatic core-pulling mechanism includes a cylinder, a piston, an air pipe and a valve. The cylinder drives the piston to move by using the pressure of compressed air, thereby pushing the core-pulling assembly to move. Before molding, the pneumatic core-pulling mechanism starts to work. When compressed air is introduced into the cylinder, the piston inside the cylinder moves forward, driving the core rod to be pulled out of the mould cavity. The cooling water temperature of the injection mould is 20°C - 30°C. The gate is a hot runner gate, which can reduce the accumulation of cold material, reduce waste and improve production efficiency. The demoulding slope is 1° - 3°, which can avoid product clamping and damage. Description of the Drawings

[0036] Figure 1 is the injection molding flow chart of the present invention; Detailed Embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] As Figure 1 shown, the embodiments of the present invention provide a technical solution for an injection molding method of a special-shaped plug-in part:

[0039] An injection molding method of a special-shaped plug-in part includes the following injection molding steps:

[0040] S1. Raw material selection

[0041] Selection of the plastic raw material for the special-shaped plug-in part: The plastic raw material includes a base material, a reinforcing material, a plasticizer and a light stabilizer. The base material is polystyrene, the reinforcing material is glass fiber and carbon fiber, the plasticizer is a cycloolefin plasticizer, and the light stabilizer is a UV absorber. The plastic raw material is filled into the injection molding machine for melting;

[0042] S2. Injection and holding pressure

[0043] Select a multi-cavity mold, which can improve production efficiency. The mold is designed with a slider and a core-pulling mechanism to ensure smooth demoulding;

[0044] The injection molding machine injects plastic raw materials into the mold for molding. The screw of the injection molding machine pushes the heated and melted plastic material to the injection port of the mold. When injecting into the mold, the plastic fills the cavity and all the detailed areas inside the mold. During this process, the mold must be kept closed to prevent plastic leakage;

[0045] S3. Mold clamping

[0046] The injection molding machine aligns the two parts (cavity and core) of the mold to form a sealed mold cavity. The injection molding machine aligns the cavity and core of the mold through the mold guiding device to ensure uniform plastic flow during molding;

[0047] The mold is tightly closed by the mold clamping device of the injection molding machine to withstand the pressure during the injection molding process;

[0048] S4. Cooling and solidifying

[0049] The cooling channels in the mold are close to the cavity to ensure cooling efficiency. The layout of the cooling channels avoids dead ends and the dimensional deformation caused by uneven cooling. The cooling water flows inside the cooling channels;

[0050] S5. Mold opening

[0051] After the connector is cooled and solidified, the mold is opened to open the cavity and the core for facilitating subsequent demolding;

[0052] S6. Demolding and cleaning

[0053] A demolding slope is designed on the surface of the connector, and the demolding mechanism is used for demolding according to the shape of the connector;

[0054] An exhaust channel is provided in the mold to prevent gas from forming bubbles during the injection molding process and improve the product quality;

[0055] The plastic overflowing during the injection molding process needs to be cleaned up, including the gate and the runner. The burrs of the product are cleaned and polished by the equipment;

[0056] S7. Removing the sprue

[0057] The mold is designed with a circular sprue and is set at the position where the plastic flows to avoid affecting the appearance of the molded product;

[0058] During the injection molding process, the plastic melt is injected into the mold through the nozzle of the injection molding machine. The sprue channel is responsible for guiding the molten plastic into the mold cavity. The sprue is the "channel" for the plastic to flow into the mold;

[0059] Using the cutting device installed on the mold, the automatic sprue removing equipment cuts. After removing the sprue, the sprue part of the molded part is polished;

[0060] S8. Storing the qualified finished products in the warehouse

[0061] Check the dimensions and tolerances of the connector using precision measuring tools; test the insertion performance of the connector to ensure the reliability and stability of the connector; after the quality of a single connector is qualified, pack it in batches to ensure protection during transportation.

[0062] Among them, the ratio of the base material, reinforcing material, plasticizer and light stabilizer is 6:1:2:1. Glass fiber can improve the tensile strength, bending strength and temperature resistance of the plastic. The plasticizer improves the plasticity and molding performance of the plastic. The mold closing speed is 50mm / s - 150mm / s, which can reduce the impact force and ensure smooth mold closing. The draft angle is 1° - 3° to avoid product jamming and damage. The demolding mechanism includes a pneumatic core-pulling mechanism. The pneumatic core-pulling mechanism includes a cylinder, a piston, an air pipe and a valve. The cylinder uses the pressure of compressed air to drive the piston to move, thereby driving the movement of the core-pulling assembly. Before molding, the pneumatic core-pulling mechanism starts to work. When compressed air is introduced into the cylinder, the piston inside the cylinder moves forward, driving the core rod to be pulled out from the mold cavity. Through the cooperation of the circular gate, exhaust channel, pneumatic core-pulling mechanism and draft angle, the mold is designed with a circular gate and is set at the position where the plastic flows, so as not to affect the appearance of the molded product. An exhaust channel is provided inside the mold to prevent gas from forming bubbles during the injection molding process and improve the product quality. The pneumatic core-pulling mechanism includes a cylinder, a piston, an air pipe and a valve. The cylinder uses the pressure of compressed air to drive the piston to move, thereby driving the movement of the core-pulling assembly. Before molding, the pneumatic core-pulling mechanism starts to work. When compressed air is introduced into the cylinder, the piston inside the cylinder moves forward, driving the core rod to be pulled out from the mold cavity. The cooling water temperature of the injection mold is 20°C - 30°C. The gate is a hot runner gate, which can reduce the accumulation of cold material, reduce waste and improve production efficiency. The draft angle is 1° - 3° to avoid product jamming and damage. During the injection molding process, the plastic melt is injected into the mold through the nozzle of the injection molding machine. The gate channel is responsible for guiding the molten plastic into the mold cavity. The gate is the "channel" for the plastic to flow into the mold. Use the cutting device installed on the mold and the automatic gate-cutting equipment to cut. After gate-cutting, the gate part of the molded part is polished. Check the dimensions and tolerances of the connector using precision measuring tools; test the insertion performance of the connector to ensure the reliability and stability of the connector; after the quality of a single connector is qualified, pack it in batches to ensure protection during transportation.

[0063] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for injection molding of a special-shaped connector, comprising the following injection molding steps: S1. Raw material selection Selection of plastic raw materials for special-shaped connectors: the plastic raw materials include base material, reinforcing material, plasticizer and light stabilizer, the base material is polystyrene, the reinforcing material is glass fiber and carbon fiber, the plasticizer is a cycloolefin plasticizer, the light stabilizer is a UV absorber, and the plastic raw materials are filled into the interior of the injection molding machine for melting; S2, injection molding pressure holding Selecting a multi-cavity mold can improve production efficiency. The mold is designed with a slider and a core-pulling mechanism to ensure smooth demoulding. The injection molding machine injects plastic raw materials into the mold for molding. The screw of the injection molding machine pushes the heated and molten plastic material to the injection port of the mold. When injected into the mold, the plastic fills the cavity and fills all the detailed areas inside the mold. During this process, the mold must be kept tightly closed to prevent plastic leakage. S3, mold closing The injection molding machine aligns the two parts of the mold (cavity and core) to form a sealed mold cavity. The injection molding machine aligns the cavity and core of the mold through the mold guide device to ensure uniform plastic flow during molding; The mold is tightly closed by the clamping device of the injection molding machine to withstand the pressure during the injection molding process; S4, cooling and shaping The cooling channel in the mold is close to the cavity to ensure cooling efficiency. The layout of the cooling channel avoids dead corners and dimensional deformation caused by uneven cooling. The cooling water flows inside the cooling channel. S5. Mold opening After the connector is cooled and shaped, the mold is opened to open the cavity and core to facilitate subsequent demoulding; S6, demoulding and cleaning Design a demoulding slope on the surface of the connector, and use a demoulding mechanism to demould according to the shape of the connector; An exhaust channel is provided in the mold to prevent gas from forming bubbles during the injection molding process and improve product quality; The plastic overflowed during the injection molding process needs to be cleaned up, including the gate and runner, and the burrs of the product need to be cleaned and polished using equipment; S7, water outlet The mold is designed with a circular nozzle, which is set at the position where the plastic flows to avoid affecting the appearance of the molded product; During the injection molding process, the plastic melt is injected into the mold through the nozzle of the injection molding machine. The sprue channel is responsible for guiding the molten plastic into the mold cavity. The sprue is the "channel" for the plastic to flow into the mold. Use the cutting device installed on the mold and the automatic dewatering equipment to cut. After dewatering, the dewatering part of the molded part is ground and polished; S8. Qualified finished products are put into storage Use precision measuring tools to check the size and tolerance of connectors; test the plug-in performance of connectors to ensure their reliability and stability; and package connectors in batches after they meet quality standards to ensure protection during transportation.

2. The injection molding method of a special-shaped connector according to claim 1, characterized in that: The ratio of the base material, reinforcing material, plasticizer and light stabilizer is 6:1:2:

1. The glass fiber can improve the tensile strength, bending strength and temperature resistance of the plastic, and the plasticizer improves the plasticity and molding performance of the plastic.

3. The injection molding method of a special-shaped connector according to claim 1, characterized in that: The mold closing speed is 50mm / s-150mm / s, which can reduce the impact force and ensure the smooth mold closing.

4. The injection molding method of a special-shaped connector according to claim 1, characterized in that: The demoulding slope is 1°-3° to avoid product jamming and damage, and the demoulding mechanism includes a pneumatic core pulling mechanism.

5. The injection molding method of a special-shaped connector according to claim 4, characterized in that: The pneumatic core pulling mechanism includes a cylinder, a piston, an air pipe and a valve. The cylinder uses the pressure of compressed air to drive the piston to move, thereby promoting the movement of the core pulling assembly. The pneumatic core pulling mechanism starts working before molding. When compressed air is introduced into the cylinder, the piston inside the cylinder moves forward, driving the core rod to be pulled out of the mold cavity.

6. The injection molding method of a special-shaped connector according to claim 1, characterized in that: The cooling water temperature of the injection mold is 20℃-30℃. The gate is a hot runner gate, which can reduce the accumulation of cold materials, reduce waste and improve production efficiency. The gate position is set at the position where the product has the largest thickness to avoid uneven filling caused by the thin-walled part being filled first.

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