Tension spring×鶴岡発條 - List of Manufacturers, Suppliers, Companies and Products

Causes and countermeasures for spring breakage and damage.

Introducing the causes and countermeasures for spring breakage and damage due to spring troubles!

The clues to identify the cause of breakage are lifespan calculations and strength calculations. If the breakage occurs significantly below the calculation results, the cause of the breakage is suspected to be "stress concentration" originating from scratches or bent areas. Measures against stress concentration include changing the shape of the spring. Effective measures include selecting "round hooks (photo)" or "tapered round hooks" for tension springs, and specifying that the bend radius of the arms of torsion springs should be greater than the wire diameter radius. If the timing of the breakage aligns with the calculations, the cause of the breakage is considered to be insufficient material strength. In this case, the countermeasure for breakage is to change the specifications of the spring. Specifically, this involves changing the material to a more durable one or increasing the wire diameter, but it is necessary to consider the balance to avoid changing the spring's force adjustment (spring constant, load). Our company responds to spring troubles. If you send us the broken parts, we will propose improvement measures. Please feel free to consult us. Tsurugaoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web meetings.

Company：鶴岡発條
Price：Other

Contract manufacturing

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Tensile spring initial tension refers to

I tried to explain "initial tension" as clearly as possible.

Initial tension refers to the force with which adjacent lines stick to each other. Imagine an experiment where you hold a hook of a tension spring (about the size of a thumb) and pull it to the left and right. You gradually apply force while pulling until a gap begins to form in the closely adhered body. If a gap forms immediately, it means the "sticking force" is weak, indicating weak initial tension. Conversely, if a gap takes a long time to form, the "sticking force" is strong, indicating strong initial tension. In this experiment, if you attach a "spring scale" to one of the hooks, you can easily measure the initial tension. The force exerted on the spring scale when a gap begins to form in the body equals the initial tension. The strength of the initial tension can be adjusted by us, the manufacturers. By changing the settings of the spring processing machine, we can wind the spring with the desired initial tension. However, the problem is that initial tension has a "suitable strength for processing." If it is too weak, the processing becomes unstable, and if it is too strong, the processing itself becomes difficult. The extent to which it can be processed strongly (or weakly) varies depending on the material, shape, and processing equipment, so I believe it is best to contact us, the manufacturers, for a shortcut.

Company：鶴岡発條
Price：Other

Contract manufacturing

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Tension spring SWP-AΦ0.4 initial tension zero

The variation in initial tension also affects the load.

The material used is "Piano Wire Type A, SWP-A," with a wire diameter of Φ0.4. The hooks at both ends are shaped as "round hooks," which are less likely to cause issues such as breakage or deformation. The hooks are slightly smaller compared to the body, but they can be formed to be smaller or larger. There is a gap in the body, which is to ensure that the initial tension (*) is zero. *Please refer to the related link for information on initial tension. Due to the manufacturing process, some variation in initial tension is unavoidable, and a tolerance of ±15% is established under JIS standards. The variation in initial tension can affect the load, but by leaving a gap in the body, this influence can be eliminated. Our company handles the manufacturing, design, and prototyping of tension springs. Please feel free to consult us if you have any concerns. Tsuruoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com We also support web conferencing.

Company：鶴岡発條
Price：Other

Contract manufacturing

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Tension spring, plate hook, measures against breakage and deformation.

It has a hook shape that is strong against bending and deformation.

The hooks of tension springs are typically formed by raising one coil at each end of the spring. When a load is applied to the tension spring, stress (load) tends to concentrate at the base and inside of this hook, so issues such as breakage or deformation mostly occur starting from the hook. The spring equipped with a plate hook, as shown in the photo, covers this "weakness" of tension springs. Although it incurs additional costs for manufacturing the separate plate, it can reduce stress concentration on the hook, making it a hook shape that is resistant to breakage and deformation. This hook shape is referred to as a "screw-in hook" in JIS standards. Additionally, the "tapered round hook," which incorporates a round wire hook inside the spring, is also a hook shape that is strong against breakage and deformation. (For more information about the tapered round hook, please refer to the related links below.) If you are experiencing issues with spring troubles such as breakage or deformation, please feel free to consult us. If you send us broken samples, we will propose improvement measures. Tsuruga Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

Company：鶴岡発條
Price：Other

Spring

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Tension spring round hook damage, breakage, and deformation countermeasures

By simply changing the shape of the hook, the durability of the spring is improved.

The most common issue we receive inquiries about regarding springs is the breakage or damage of tension springs. In particular, most cases involve the hook or the part where it catches breaking. Tension springs have a characteristic where stress (load) concentrates at the hook, which can lead to breakage or deformation. The photo shows a spring designed and prototyped by our company in response to inquiries, aimed at preventing breakage. We considered the specifications of the spring to ensure that the stress (load) on the hook does not exceed the material's strength, and we adopted a "large round hook with a bending radius." The spring's force adjustment (spring constant, load) has not been changed. If the durability of the "large round hook with a bending radius" is still insufficient, we recommend adopting a "tapered round hook," although this will slightly increase costs. (Please refer to the related links.) If you are experiencing issues with spring breakage, damage, or deformation, please feel free to consult us. If you send us broken samples, we will propose improvement measures. We look forward to your inquiries. Tsuruoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

Company：鶴岡発條
Price：Other

Contract manufacturing

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Tensile spring initial tension and initial stress

A little difficult to understand: "initial tension" and "initial stress"

When calculating the load of a tension spring, we consider an unfamiliar force called initial tension. Initial tension is the force that causes the coils to want to adhere to each other, and it can be determined from the wire diameter, the average coil diameter, and "initial stress." However, in the literature, it is stated that there is a certain range for the value of "initial stress," and it is troublesome as it suggests selecting an appropriate value from that range. In fact, initial tension can be adjusted by us manufacturers by winding it tightly or loosely. (We adjust the strength by changing the settings of the spring processing machine.) To put it somewhat roughly, the "range of adjustment" on the manufacturer's side is quantified as the "range of initial stress." Even if the springs appear to have the same specifications, if the manufacturer applies a strong "initial stress," it will result in a spring with strong initial tension. Initial tension and initial stress are concepts that are difficult to understand just by reading books. (For more information on initial tension, please refer to the related links.) If you have any questions, please feel free to contact us by phone or email. Tsurugaoka Spring Co., Ltd. Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com

Company：鶴岡発條
Price：Other

Spring

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Tension spring×鶴岡発條 - List of Manufacturers, Suppliers, Companies and Products

Tension spring Product List

Causes and countermeasures for spring breakage and damage.

Tensile spring initial tension refers to

Tension spring SWP-AΦ0.4 initial tension zero

Tension spring, plate hook, measures against breakage and deformation.

Tension spring round hook damage, breakage, and deformation countermeasures

Tensile spring initial tension and initial stress

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