Production method of mountain bike saddle

Abstract

The invention discloses a production method of a mountain bike saddle, and relates to the technical field of bike accessory production, and the production method comprises the following specific steps: step 1, preparing materials; secondly, a mold is installed and adjusted; 3, injection molding; fourthly, the bottom plate is fixed in an injection mold; step 5, preparing rubber; step 6, injection molding; (1) equipment temperature control; (2) plasticizing stage; (3) injection stage; (4) a pressure maintaining stage; (5) vulcanizing; step 7, secondary cooling; step 8, quality detection; and ninthly, accessories are assembled, and the seat beams and the seat clamps are installed according to design requirements and packaged. According to the production method of the mountain bike saddle, the complex working procedures that a bottom plate of a common saddle is manufactured, then glue spraying and foaming are conducted, artificial leather is used for manual manufacturing, and nailing and trimming are conducted are omitted, the labor cost is reduced, the complex working procedures are reduced, and most importantly, air pollution caused in the glue spraying process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bicycle accessory production, in particular to a method for producing a mountain bicycle saddle. Background Art

[0002] A bicycle is a means of transport and transportation that is powered by human power, also known as a bicycle or a bike. It has at least two wheels, uses handlebars and front forks for steering, is driven by human power, and is made of steel, light alloy or plastic.

[0003] Mountain bikes, also known as "mountainbikes" in English, or MTBs for short, originated in the United States. They were developed by American youths who rode bicycles for fancy races on off-road motorcycle races. This type of bicycle is designed for off-road driving (such as hills, trails, fields, and sandy gravel roads), and can travel on complex roads.

[0004] With the popularity of mountain biking, people have higher and higher requirements for the quality of mountain bike accessories. While pursuing the ultimate lightweight of the body and accessories, they also need the bicycle to be able to withstand greater riding pressure.

[0005] Currently, mountain bike saddles are mostly composed of a base plate, foam, sponge, outer leather and other metal parts. The production process is relatively complicated. A finished saddle requires multiple process steps, resulting in high labor costs in the production process. In addition, spraying glue is performed during the saddle bonding process, which easily causes air pollution. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a method for producing a mountain bike saddle, which solves the problems raised in the above background technology.

[0007] To achieve the above object, the present invention is implemented by the following technical scheme: A method for producing a mountain bike saddle comprises the following specific steps:

[0008] Step 1: Prepare the material, heat and dry the raw material particles, and then pour them into the hopper of the injection molding machine;

[0009] Step 2: Install and adjust the mold. Determine the size and structure of the mold according to the size of the base plate. Use high temperature resistant materials for the mold and ensure that the parts fit closely during the installation process.

[0010] Step 3: Injection molding, the specific steps are as follows:

[0011] (1) Raise the mold temperature to 90-120°C to complete the preheating operation;

[0012] (2) The injection molding equipment uses a screw injection molding machine with a preheating temperature of 160-180°C;

[0013] (3) heating the raw material in the hopper to 300-320°C to melt it, stirring it continuously during the heating process, and injecting the heated raw material into the injection molding equipment;

[0014] (4) The raw material is injected into the mold under high pressure by rotating the screw, the injection pressure is set to 75-120 MPa, and the screw speed is set to 40-80 r / min;

[0015] (5) Pressure-maintaining molding, the pressure drops to 35-50 MPa, and the temperature drops to 120-160°C;

[0016] (6) Cooling and molding: using water cooling outside the mold to cool the mold and the finished product until the plastic is solidified in the mold, opening the mold, taking out the molded part, obtaining the bottom plate of the saddle, and trimming and deburring the edge of the bottom plate;

[0017] Step 4: Fix the base plate in the injection mold;

[0018] Step 5: Rubber material preparation, hot-melt and mix all raw materials evenly to obtain the prepared raw materials;

[0019] Step 6: Injection molding, the specific steps are as follows:

[0020] (1) Equipment temperature control: preheat the barrel, nozzle and mold of the injection machine, and the preheating temperature is set to 105-120°C;

[0021] (2) Plasticizing stage: the hot melt mixed raw materials are poured into the barrel, and the barrel is heated to 250-320°C to keep the raw materials fluid. At the same time, the screw in the injection machine rotates, stirring and transporting the rubber to the nozzle;

[0022] (3) Injection stage, the plasticized rubber is injected into the mold cavity through the nozzle;

[0023] (4) During the pressure holding stage, after the rubber fills the mold cavity, the pressure is maintained for 3-10 minutes to compensate for the shrinkage of the rubber during the cooling process;

[0024] (5) vulcanization: vulcanization treatment is performed on the injected styrene-butadiene rubber product to cause a cross-linking reaction, and the vulcanization temperature is set at 75-105°C;

[0025] Step 7: Secondary cooling: cool the rubber material in the mold to solidify it into shape. Use water cooling. After the plastic is cooled in the mold, open the mold and take out the molded part.

[0026] After taking out the molded parts, remove the excess material and burrs, and trim and process the molded parts;

[0027] Step 8: Quality inspection;

[0028] Step 9: Assemble accessories, install the seat beam and seat card according to design requirements, and pack.

[0029] Optionally, the oven temperature in step 1 is set to 150-160° C. and dried for 2-3 hours.

[0030] Optionally, the raw material in step 1 uses PPS polyphenylene sulfide as the raw material for making the base plate.

[0031] Optionally, the rubber in step five uses styrene-butadiene rubber as the wrapping material of the bottom plate.

[0032] Optionally, the styrene-butadiene rubber is composed of butadiene, styrene, rosin soap, potassium stearate, a diffusant, potassium chloride, EDTA, ferrous sulfate, Rongalite, an initiator, and soft water.

[0033] Optionally, the raw materials of the styrene-butadiene rubber are specifically:

[0034] 70 parts of butadiene; 30 parts of styrene; 4-6 parts of rosin soap; 0.5-1 parts of potassium stearate; 0.1-0.5 parts of diffusant; 0.7-1.2 parts of potassium chloride; 0.05-0.1 parts of EDTA; 0.02-0.04 parts of ferrous sulfate; 0.1-0.3 parts of Rongalite; 0.1-0.5 parts of initiator; 250 parts of soft water.

[0035] Optionally, the quality inspection in step eight is specifically as follows:

[0036] Appearance quality inspection: check whether the surface of the saddle is smooth and whether there are scratches, cracks or bubbles;

[0037] Dimensional accuracy inspection: use measuring tools to measure the length, width, height and aperture of the saddle to ensure that its dimensional accuracy is within the tolerance range required by the design;

[0038] Performance test, simulating the pressure of the human body on the saddle during riding, to check whether the saddle will be deformed or damaged.

[0039] The present invention provides a method for producing a mountain bike saddle, which has the following beneficial effects:

[0040] The production method of the mountain bike saddle saves the complicated process of making a bottom plate of an ordinary saddle, spraying glue and foaming, and then manually making and nailing artificial leather to trim the edges, thereby reducing labor costs and complicated processes, and most importantly, reducing air pollution caused by the spraying process.

[0041] This saddle adopts a double composite injection molding structure, which maintains strength and durability while still providing sufficient comfort. During the injection molding process, high-pressure injection and rapid filling technologies are used to ensure the consistency and shape accuracy of the product. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] The production method of a mountain bike saddle comprises the following specific steps:

[0044] Step 1: Prepare the material, heat and dry the raw material particles, and then pour them into the hopper of the injection molding machine. The oven temperature is set to 155.3°C and dried for 2.3 hours. PPS polyphenylene sulfide is used as the raw material for the base plate;

[0045] Step 2: Install and adjust the mold. Determine the size and structure of the mold according to the size of the base plate. Use high temperature resistant materials for the mold and ensure that the parts fit closely during the installation process.

[0046] Step 3: Injection molding, the specific steps are as follows:

[0047] (1) Raise the mold temperature to 92.8°C to complete the preheating operation;

[0048] (2) The injection molding equipment uses a screw injection molding machine, and its preheating temperature is 175.3°C;

[0049] (3) heating the raw material in the hopper to 315.5°C to melt it, stirring it continuously during the heating process, and injecting the heated raw material into the injection molding equipment;

[0050] (4) The raw material is injected into the mold under high pressure by rotating the screw, the injection pressure is set to 105 MPa, and the screw speed is set to 75 r / min;

[0051] (5) Pressure-maintaining molding: the pressure drops to 42.6 MPa and the temperature drops to 158 ± 1 °C;

[0052] (6) Cooling and molding: using water cooling outside the mold to cool the mold and the finished product until the plastic is solidified in the mold, opening the mold, taking out the molded part, obtaining the bottom plate of the saddle, and trimming and deburring the edge of the bottom plate;

[0053] Step 4: Fix the base plate in the injection mold;

[0054] Step 5: Rubber preparation: hot melt all raw materials and mix them evenly to obtain the prepared raw materials. The rubber uses styrene-butadiene rubber as the wrapping raw material for the bottom plate. The composition of styrene-butadiene rubber is as follows:

[0055] 70 parts of butadiene; 30 parts of styrene; 4 parts of rosin soap; 0.8 parts of potassium stearate; 0.3 parts of diffusing agent; 0.9 parts of potassium chloride; 0.08 parts of EDTA; 0.03 parts of ferrous sulfate; 0.2 parts of Rongalite; 0.3 parts of initiator; 250 parts of soft water;

[0056] Step 6: Injection molding, the specific steps are as follows:

[0057] (1) Equipment temperature control: preheat the barrel, nozzle and mold of the injection molding machine, and the preheating temperature is set to 105.8°C;

[0058] (2) Plasticizing stage: the hot melt mixed raw materials are poured into the barrel, and the barrel is heated to 301.7°C to keep the raw materials fluid. At the same time, the screw in the injection machine rotates, stirring and transporting the rubber to the nozzle;

[0059] (3) Injection stage, the plasticized rubber is injected into the mold cavity through the nozzle;

[0060] (4) Holding pressure stage: after the rubber fills the mold cavity, the pressure is maintained for 4 minutes to compensate for the shrinkage of the rubber during the cooling process;

[0061] (5) vulcanization: vulcanizing the injected styrene-butadiene rubber product to cause a cross-linking reaction, and the vulcanization temperature is set at 92.6°C;

[0062] Step 7: Secondary cooling: cool the rubber material in the mold to solidify it into shape. Use water cooling. After the plastic is cooled in the mold, open the mold and take out the molded part.

[0063] After taking out the molded parts, remove the excess material and burrs, and trim and process the molded parts;

[0064] Step 8: Quality inspection, as follows:

[0065] Appearance quality inspection: check whether the surface of the saddle is smooth and whether there are scratches, cracks or bubbles;

[0066] Dimensional accuracy inspection: use measuring tools to measure the length, width, height and aperture of the saddle to ensure that its dimensional accuracy is within the tolerance range required by the design;

[0067] Performance test, simulating the pressure of the human body on the saddle during riding, to check whether the saddle will be deformed or damaged;

[0068] Step 9: Assemble accessories, install the seat beam and seat card in sequence according to the design requirements, and pack them.

[0069] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for producing a mountain bike saddle, characterized in that: The specific steps include: Step 1: Prepare the material, heat and dry the raw material particles, and then pour them into the hopper of the injection molding machine; Step 2: Install and adjust the mold. Determine the size and structure of the mold according to the size of the base plate. Use high temperature resistant materials for the mold and ensure that the parts fit closely during the installation process. Step 3: Injection molding, the specific steps are as follows: (1) Raise the mold temperature to 90-120°C to complete the preheating operation; (2) The injection molding equipment uses a screw injection molding machine with a preheating temperature of 160-180°C; (3) heating the raw material in the hopper to 300-320°C to melt it, stirring it continuously during the heating process, and injecting the heated raw material into the injection molding equipment; (4) The raw material is injected into the mold under high pressure by rotating the screw, the injection pressure is set to 75-120 MPa, and the screw speed is set to 40-80 r / min; (5) Pressure-maintaining molding, the pressure drops to 35-50 MPa, and the temperature drops to 120-160°C; (6) Cooling and molding: using water cooling outside the mold to cool the mold and the finished product until the plastic is solidified in the mold, opening the mold, taking out the molded part, obtaining the bottom plate of the saddle, and trimming and deburring the edge of the bottom plate; Step 4: Fix the base plate in the injection mold; Step 5: Rubber material preparation, hot-melt and mix all raw materials evenly to obtain the prepared raw materials; Step 6: Injection molding, the specific steps are as follows: (1) Equipment temperature control: preheat the barrel, nozzle and mold of the injection machine, and the preheating temperature is set to 105-120°C; (2) Plasticizing stage: the hot melt mixed raw materials are poured into the barrel, and the barrel is heated to 250-320°C to keep the raw materials fluid. At the same time, the screw in the injection machine rotates, stirring and transporting the rubber to the nozzle; (3) Injection stage, the plasticized rubber is injected into the mold cavity through the nozzle; (4) During the pressure holding stage, after the rubber fills the mold cavity, the pressure is maintained for 3-10 minutes to compensate for the shrinkage of the rubber during the cooling process; (5) vulcanization: vulcanization treatment is performed on the injected styrene-butadiene rubber product to cause a cross-linking reaction, and the vulcanization temperature is set at 75-105°C; Step 7: Secondary cooling: cool the rubber material in the mold to solidify it into shape. Use water cooling. After the plastic is cooled in the mold, open the mold and take out the molded part. After taking out the molded parts, remove the excess material and burrs, and trim and process the molded parts; Step 8: Quality inspection; Step 9: Assemble accessories, install the seat beam and seat card according to design requirements, and pack.

2. The method for producing a mountain bike saddle according to claim 1, characterized in that: The oven temperature in step 1 is set to 150-160° C. and dried for 2-3 hours.

3. The method for producing a mountain bike saddle according to claim 1, characterized in that: The raw material in step 1 uses PPS polyphenylene sulfide as the raw material for making the base plate.

4. The method for producing a mountain bike saddle according to claim 1, characterized in that: The rubber in step 5 uses styrene-butadiene rubber as the wrapping material of the bottom plate.

5. The method for producing a mountain bike saddle according to claim 4, characterized in that: The styrene-butadiene rubber is composed of butadiene, styrene, rosin soap, potassium stearate, a diffusant, potassium chloride, EDTA, ferrous sulfate, Rongalite, an initiator and soft water.

6. The method for producing a mountain bike saddle according to claim 5, characterized in that: The raw materials of the styrene-butadiene rubber are specifically: 70 parts of butadiene; 30 parts of styrene; 4-6 parts of rosin soap; 0.5-1 parts of potassium stearate; 0.1-0.5 parts of diffusant; 0.7-1.2 parts of potassium chloride; 0.05-0.1 parts of EDTA; 0.02-0.04 parts of ferrous sulfate; 0.1-0.3 parts of Rongalite; 0.1-0.5 parts of initiator; 250 parts of soft water.

7. The method for producing a mountain bike saddle according to claim 1, characterized in that: The quality inspection in step eight is as follows: Appearance quality inspection: check whether the surface of the saddle is smooth and whether there are scratches, cracks or bubbles; Dimensional accuracy inspection: use measuring tools to measure the length, width, height and aperture of the saddle to ensure that its dimensional accuracy is within the tolerance range required by the design; Performance test, simulating the pressure of the human body on the saddle during riding, to check whether the saddle will be deformed or damaged.