Stop Bolt is a mechanical fastener with a special structure and function, widely used in molds and precision equipment. Here is its detailed description:
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1. Core structure and design features
Shoulder design: There is a cylindrical shoulder between the head and the screw, which tightly fits the fastened component during fastening, achieving precise positioning and stopping.
Material and Performance: Made of SCM435 alloy steel with a hardness of 33-38HRC, it combines high toughness, wear resistance, and heat resistance, making it particularly suitable for high-temperature working environments.
• Coordinated use: Often used in conjunction with bolt pull rods to control the mold opening stroke of the parting surface through threaded connections, making the mold design more compact.
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2. Function and Function
• Positioning and stopping: The shoulder design ensures that the relative position of the components is fixed, preventing movement deviation, and is suitable for scenarios that require precise positioning (such as the fixed mold seat plate and flow channel push plate in the mold three plate mold).
Anti vibration and stability: By directly mechanically cooperating (without relying on friction) to withstand lateral loads, the reliability and anti vibration ability of the connection are improved.
• Thermal deformation control: effectively reduces deformation caused by thermal expansion in high-temperature molds and extends mold life.
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3. Application scenarios
In the field of molds, it is used for controlling the opening stroke of three plate molds, simplifying the mold structure, and achieving miniaturization.
Mechanical transmission: transmission devices that require high-precision positioning in automotive and aerospace equipment.
High temperature environment: Its heat resistance makes it suitable for high-temperature work scenarios such as metallurgy and injection molding.
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4. Usage guidelines
Selection and matching: The specifications need to be selected based on the material, load, and aperture. The thread length is usually 1.5 times the diameter.
Installation requirements:
The depth of the countersunk hole should meet the following requirements: W=S (stroke)+shoulder thickness K+2mm;
Use a torque wrench to control the preload force and avoid over tightening or over loosening;
Before installation, the threads need to be cleaned and lubricated to prevent locking.
Quality inspection: Ensure that the thread connection gauge is qualified, and verify the fastening status after installation.
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5. Difference from ordinary bolts
• Function extension: It combines positioning and fastening, while ordinary bolts only provide fastening function;
Structural difference: The shoulder design achieves mechanical stopping, which is not available with ordinary bolts.
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summarize
Plug in screws solve the positioning, vibration resistance, and high temperature resistance requirements in precision equipment through their unique shaft shoulder structure and material properties. They are key components in the fields of molds and high-precision machinery. Its design balances functionality and reliability, requiring strict adherence to installation specifications to achieve optimal performance
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