Yellow Color Compression Springs OD 30mm 50CrVA Materials TF
How to choose the spring for my mold
1. OD
OD =2*ID, so the OD of spring shoulder be twice of your pins
The inner diameter of our mold spring are positive tolerance, e,g.:
the diameter of pins is 7.5mm, the OD of spring should be 15mm, we
have the standard size 14mm spring only and it is useable.
2. Length
Free length =(stroke + pre-compressed length)/Compression ratio
Pre-compressed length usually is 10% of the free length.
Compression ratio is according to the lifetime, as shown in the table below:
| Loding | color | lifetime and compression ratio | max compression |
| 300000 | 500000 | 1000000 |
| lighter | yellow | 50% | 45% | 40% | 58.0% |
| light | blue | 40% | 36% | 32% | 48.0% |
| middel | red | 32% | 28.8% | 25.6% | 38.0% |
| heavy | green | 24% | 21.6% | 19.2% | 28.0% |
| super-heavy | brown | 20% | 18% | 16% | 24% |
3. Color and loading
Elastic force=spring constant * compressed length
Generally speaking, the elastic force when the spring is
pre-compressed should bigger than 2~2.5 times the weight of the
ejector plate, the elastic force when the spring is compressed
should bigger than 1.3 times of all the pressure on it, of course,
the force is shared by all springs, so pay attention to the number
of them
Details of The Compression Springs
| Materials | OD / mm | ID / mm | Length / cm | Color | Loading | Standard |
| 50CrVA | 30 | 15~15.5 | 2.5~30 | Yellow TF | Max 72Kg | JIS |
Constant and Free length of this Compression Springs
| free length mm | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 |
| spring constant N/mm | 56.88 | 47.07 | 40.5 | 35.3 | 31.48 | 28.24 | 25.79 | 23.54 | 21.77 | 20.1 |
| free length mm | 75 | 80 | 90 | 100 | 125 | 150 | 175 | 200 | 250 | 300 |
| spring constant N/mm | 18.93 | 17.65 | 15.69 | 14.12 | 11.28 | 9.41 | 8.04 | 7.06 | 5.69 | 4.71 |
Materials of Compression Springs
1. 65Mn
The strength is relatively low, with a certain degree of toughness
and plasticity, and the elastic coefficient is equivalent to that
of alloy spring steel. But the hardenability is poor, mainly used
for smaller size springs, injection mold springs.
Tensile Strength ≥735MPa
Yield Strength ≥430MPa
Elongation δ10 (%):14~21.5
Application: Can be competent for general injection molds, low
price is its core competitiveness
2. 55Si2Mn
The 55Si2Mn spring steel has high strength, good elastic limit,
high yield ratio, good toughness after heat treatment, and higher
hardenability than 65Mn steel. It is suitable for the manufacture
of flat springs with medium loads such as railway vehicles,
automobiles, and tractors, and spiral springs with a diameter of
less than 25mm. Cushion springs and cylinder safety valves are
important springs that work under high stress, and can also be used
as heat-resistant springs below 250°C.
Tensile Strength ≥1274MPa
Yield Strength ≥1176MPa
Elongation δ10 (%) ≥ 6%
Application: Can be competent for all the injection molds and
punching dies, anti-deformation ability is its core competitiveness
3. 50CrVA
The 50CrVa is a high-grade spring steel, has higher toughness,
strength and elastic limit, fatigue strength, lower elastic
modulus, higher yield ratio and hardenability, and good impact
toughness; suitable for manufacturing large cross-section high-load
springs and valve springs and piston springs whose working
temperature is not higher than 300℃;
Tensile Strength ≥1274MPa
Yield Strength ≥1127MPa
Elongation δ5 (%) ≥10%
Application: Can be competent for all the injection molds and
punching dies, especially for high temperature injection molds and
large punching dies, temperature resistance ability and
high-loading are its core competitiveness
How to buy the mold springs
- Please pay attention to our minimum order quantity.
- All shipping terms are available, please contact us for shipping
cost.
- Prices can be negotiated for bulk order,
About the payment, T/T, PayPal and WestUnion is welcome, for the
bulk order , please feel free to contact us for whlesale price.
| T/T | Paypal | Western Union |
| Bank Name | DBS Bank(Hong Kong) Limited | alicechu@szbede.com | First name: | CAIXIA |
| Bank Address | 11th Floor, The centre, 99 Queen's Road Central,Central,HongKong | Last name: | CHU |
| SWIFT Code | DHBKHKHH | Address: | Xinqiao Street,Bao'an District, Shenzhen, China |
| Account Name | XT Shenzhen Bede mold CO, Ltd |
| account NO. | 79969019953 |
| Contact: | Name: Kerry Kim | Telephone of office: +86 755 527084976 |
| Mobile/ whatsapp:+8615915396878 | Email: kerrykim@szbede.com
|
