Apakah larian jejarian pada aci?

Larian jejari (TIR) ialah jumlah variasi jarak yang diukur dari permukaan aci ke rujukan tetap apabila aci berputar satu pusingan penuh. TIR bersamaan dengan dua kali ganda kesipian.

Bagaimanakah saya mengukur larian keluar dengan penunjuk dail?

Pasangkan aci pada blok-V, letakkan penunjuk dail serenjang dengan permukaan, sifarkannya, kemudian putar satu pusingan penuh. Pergerakan jarum keseluruhan ialah TIR.

Apakah yang menyebabkan larian jejarian yang berlebihan?

Punca biasa: aci bengkok, kesipian pembuatan, haus jurnal galas, penjajaran gandingan yang tidak betul dan ralat pemasangan.

Apakah hubungan antara larian keluar dan ketidakseimbangan?

If the mass centre of a rotor is displaced by eccentricity e, the equivalent unbalance is U = e Г— m, where m is rotor mass. Journal runout can displace the mass centre and thus contribute to unbalance, but measured TIR also includes form error, bend and setup error, so runout and residual unbalance are related yet not equal.

Apakah runout yang boleh diterima untuk aplikasi yang berbeza?

The geometric runout tolerance comes from the shaft drawing or the manufacturer's specification, not from ISO 21940-11. As a balance-risk screening value, the unbalance-equivalent TIR is about 40 Ојm at G6.3 / 3000 RPM, about 3.2 Ојm at G1.0 / 6000 RPM, and about 80 Ојm at G6.3 / 1500 RPM. Always calculate for your specific conditions and check the drawing tolerance.

Alat Kejuruteraan Percuma

Kalkulator Larian Jejari Aci

Estimate the shaft radial runout (TIR вЂ” Total Indicator Reading) that corresponds to the ISO 21940-11 residual unbalance limit for your balance quality grade and speed, and screen measured runout for unbalance risk. Note: ISO 21940-11 sets unbalance limits вЂ” the geometric runout tolerance itself comes from the shaft drawing or manufacturer specification.

ISO 21940-11 TIR / Keeksentrikan Balance-Risk Screening

Gred Baki G

Kelajuan Operasi (RPM)

Diameter Aci (mm)

Jisim rotor (kg)

Larian Keluar Diukur вЂ” optional, for balance-risk screening (μm TIR)

Pratetap pantas

Keputusan

Unbalance-Equivalent TIR (screening value, not a geometric tolerance)

—

Keeksentrikan yang Dibenarkan (e_per)

—

Ketidakseimbangan Setara (U_per)

—

Halaju Sudut ω

—

Gred Baki

—

Keeksentrikan yang Dibenarkan

Daripada keseimbangan kualiti gred G dan kelajuan operasi:

G — gred kualiti baki (mm/s)
n — kelajuan operasi (RPM)
ω — halaju sudut (rad/s) = 2πn/60

Bacaan Petunjuk Keseluruhan

TIR yang diukur dengan penunjuk dail ialah dua kali ganda kesipian (puncak ke puncak):

Scope of this check: e_per in ISO 21940-11 is a permissible residual ketidakseimbangan (mass-centre eccentricity), not a geometric runout tolerance. TIR = 2 Г— e_per oleh itu ialah penyaringan value: if measured journal runout exceeds it, the mass-centre displacement from runout alone could already exceed the balance limit for the selected G grade. It does not replace the geometric runout tolerance on the shaft drawing, and a shaft with low TIR can still be out of balance (mass distribution), while measured TIR can include form error, bend, bearing seating or setup error that does not translate one-to-one into unbalance.

Ketidakseimbangan Setara

Contoh Praktikal

Contoh — Aci Pam G6.3 pada 3000 RPM

Diberi: Kelajuan = 3000 RPM, Gred = G6.3, Jisim = 45 kg, Diameter = 40 mm

ω = 2π × 3000 / 60 = 314.16 rad/s

e_per = 6.3 × 1000 / 314.16 = 20.05 μm

TIR = 2 × 20.05 = 40.1 μm

U_per = 20.05 × 45 = 902.3 g·mm

Unbalance-Equivalent Runout Reference Table (screening values)

Gred	Kelajuan (RPM)	e_per (mikrometer)	Equivalent TIR (Ојm)
G6.3	750	80.2	160.4
G6.3	1500	40.1	80.2
G6.3	3000	20.1	40.1
G2.5	3000	7.96	15.9
G2.5	6000	3.98	7.96
G1.0	6000	1.59	3.18
G1.0	12000	0.80	1.59