Pengimbangan Rotor pada Pelarik: Penyelesaian Kos Berkesan untuk Meningkatkan Kualiti Produk
Dalam pembuatan moden, di mana kualiti produk adalah sangat penting, pengimbangan rotor menjadi bahagian penting daripada proses teknologi. Walau bagaimanapun, membeli peralatan pengimbang khusus boleh mahal bagi perusahaan kecil dan sederhana. Dalam artikel ini, kami meneroka kemungkinan menggunakan pelan untuk pemutar pengimbangan, yang dapat mengurangkan kos peralatan dengan ketara dan meningkatkan kecekapan pengeluaran.
Pelarik sebagai Alat untuk Mengimbang
The lathe, due to its design and functionality, can be successfully used for balancing rotors of various types and sizes. The main advantage of this approach is cost savings, as there is no need to purchase expensive specialized equipment. Additionally, using a lathe allows for balancing to be carried out directly during the rotor’s manufacturing process, which shortens production time and improves product quality.
Persiapan untuk Pengimbangan
Sebelum memulakan proses pengimbangan, beberapa langkah persediaan mesti diambil:
- Memilih mesin pelarik yang sesuai: Pelarik harus mempunyai ketegaran dan ketepatan yang mencukupi untuk memastikan pemasangan rotor yang boleh dipercayai dan ukuran getaran yang tepat.
- Memasang sistem pengukuran: Untuk mengukur rotor getaran pada pelan, pengimbang mudah alih seperti Balanset-1A boleh digunakan. Ia merangkumi sensor getaran, takometer, dan perisian untuk analisis data dan pengiraan jisim pembetulan.
- Dealing with the spindle’s own unbalance: You do not have to balance the lathe spindle itself. Run the lathe with the chuck alone (rotor removed) and record the vibration vector: that is the baseline contributed by the spindle and chuck. If it is a significant fraction of the rotor reading, either subtract it, or — better — use the 180° index run (the “Mandrel eccentricity elimination” function, “F7 - Run Ecc”), which automatically separates everything that does not rotate with the rotor.
- Matching the rotor to the machine, not to the spindle: What matters is that the rotor’s unbalance force produces a measurable response on the bearing housings. A heavy, rigid lathe responds very little per gram of unbalance, so on a very light rotor the signal disappears in the noise, while a very heavy rotor may exceed the rated load of the chuck or the bearings. In practice, check that a properly sized trial weight gives a clean, repeatable amplitude and phase change before you trust any influence coefficient.
- Checking the runout of the rubber cover before balancing: On a rubberized shaft, mass unbalance and geometric runout of the covering are two different defects. Balancing cancels the 1× force; it cannot make an eccentric or oval cover round. Set a dial indicator against the covered surface and turn the shaft by hand: if the total indicated runout exceeds the product tolerance, grind or turn the cover concentric first — on the same lathe — and only then balance. A shaft that is balanced but still runs out will keep producing gauge bands, streaks and nip-pressure variation no matter how low the vibration reading gets.
Dalam artikel ini, saya akan memperincikan pengalaman dan metodologi kami dalam mengimbangkan secara dinamik rubberized shafts on a lathe machine – a solution that, admittedly, I was initially skeptical of due to the inherent rigidity and substantial weight of such machinery. Surprisingly, the operation was seamlessly executed, achieving the G 6.3 balance quality grade (ISO 21940-11, formerly ISO 1940-1).
Proses Pengimbangan Rotor pada Pelarik secara teori
Proses pengimbangan rotor pada mesin bubut melibatkan langkah-langkah berikut:
Mengamankan Rotor
Pemutar dipasang dengan selamat dalam chuck pelarik atau pada pusat untuk memastikan kestabilan semasa proses pengimbangan.
Memasang Penderia
Fit one vibration sensor per correction plane — one on the headstock bearing housing and one on the tailstock or steady-rest housing — radially, as close to the bearing as possible, on a clean machined metal surface via a magnetic base. Do not mount sensors on the lathe bed, the apron or a guard: the 1× signal there is attenuated and dominated by the structure. Stick the pita pemantul on a metal face (the shaft end or the chuck), not on the rubber covering, and aim the laser tachometer perpendicular to it.
Mengukur Getaran Awal
The initial vibration level is measured at the speed you will use for the whole job. All runs — Run 0, the trial runs and the trim run — must be made at the same speed, because the influence coefficients are only valid for the speed at which they were measured.
Accounting for Eccentricity (immediately after Run 0)
Fixture and mandrel kesipian adds a vector to the Run 0 reading that is not unbalance, and correcting for it would be wrong. Deal with it before the trial weight, not afterwards: tick the “Mandrel eccentricity elimination” checkbox in the Balanset-1A software, complete Run 0, then rotate the rotor 180° in the fixture and press “F7 - Run Ecc”. The software takes the vector half-sum as the eccentricity and the vector half-difference as the true unbalance, and only then unlocks the trial run. Doing this after the correction weights are already welded on means recalculating and redoing them.
How big should a trial weight be?
A safe starting point is a weight whose centrifugal force stays within 5–10% of the rotor weight. As a formula:
mpercubaan = k · M · g / (R · ω²), k = 0.05–0.10
di mana M is the rotor mass (kg), g = 9.81 m/s², R is the mounting radius of the weight (m), and ω = 2π·RPM/60 (rad/s). Example: a 50 kg rotor at 3,000 rpm with the weight at R = 0.2 m gives m ≈ 0.07·50·9.81/(0.2·314²) ≈ 1.7 g — grams, not hundreds of grams. That looks surprisingly small for a 50 kg rotor, but check the force: at 3,000 rpm those 1.7 g already pull F = m·R·ω² ≈ 34 N — about 7% of the rotor’s weight. Starting small is the point: stepping up is cheap, while an oversized weight is a real load on bearings and welds. The same force check works in reverse for any weight you are about to bolt on.
You don’t have to compute this by hand: the Balanset software includes a First Trial Weight Estimator that recommends both the mass and the starting angle from your rotor data, and a Ujian Bump to check that you are not working near a natural frequency.
A good trial weight changes the reading by at least 20–30% in amplitude or 20–30° in phase. If the response is smaller, increase the weight stepwise — never jump straight to a heavy weight “to see something happen.”
Installing a Trial Weight
A berat percubaan of known mass is installed on the rotor, and the vibration is measured again. For two-plane balancing this is done in each plane in turn — a trial run with the weight in plane 1 (Run 1), then a trial run with the weight in plane 2 (Run 2) — so the software can measure the influence of each correction plane separately.
Mengira Jisim Pembetulan
Perisian Balanset-1A menganalisis hasil pengukuran dan mengira jisim pembetulan yang diperlukan dan sudut penempatannya.
Membetulkan Jisim Rotor
Bergantung pada reka bentuk rotor dan keupayaan pelarik, pembetulan jisim boleh dilakukan dengan menggerudi, mengisar, mengimpal atau kaedah lain.
Pengesahan Pengimbangan
Selepas membuat pembetulan, pengukuran getaran kawalan dijalankan. Proses ini diulang jika perlu sehingga tahap keseimbangan yang diperlukan dicapai.
Dynamic Balancing in Practice
- Frekuensi putaran: Typically, the working rotation speed of these shafts ranges between 300 to 500 revolutions per minute (rpm). In this particular case, we carried out the balancing at 550 rpm.
- Penyediaan: Poros berlapis getah dipasang pada mesin bubut, diikuti dengan penempatan sensor secara strategik, seperti yang digambarkan dalam gambar-gambar yang disertakan.
Penyelarasan Dinamik di Tempat pada Poros Bergetah Menggunakan Mesin Bubut
Penyeimbangan Dinamik Poros Bergetah
- Bacaan Getaran Awal: Sebelum pengimbangan, awal vibration readings stood at 9 mm/s and 17 mm/s.
- Trial Runs: A two-plane job needs a trial run in each plane in turn — Run 1 with the weight in plane 1, then Run 2 with the weight in plane 2. A trial weight of 340 grams was welded on; it altered the vibration and fasa readings by roughly 10%. Treat such a response as a bare minimum: for a clear, confident measurement we normally aim for a trial weight that shifts the vibration vector by 25–50%, but a heavy, rigid lathe responds very little per gram of trial mass.
- Penyesuaian Penyeimbangan: Post the trial runs with the trial weight, our Balanset-1A instrument indicated the need for the addition of 3100 grams on one side of the shaft and 4300 grams on the other, corresponding to corrections in dua kapal terbang. After these adjustments, vibration levels decreased to 2 mm/s and 4 mm/s.
Penyelarasan Dinamik di Tempat pada Poros Bergetah Menggunakan Mesin Bubut
Penyelarasan Dinamik di Tempat pada Poros Bergetah Menggunakan Mesin Bubut
- Penalaan halus: To further optimize results, we proceeded to add weights of 400 grams and 700 grams. Subsequently, another round of fine-tuning was executed by adding 200 grams and 400 grams. Due to spatial constraints, the weights were welded atop one another. Ultimately, these temporary weights were replaced with precision-cut, aesthetically pleasing counterweights crafted specifically for this shaft. The final vibration readings were an impressive 0.1 mm/s in both planes (a rounded figure — below 1 mm/s the instrument itself displays readings to three decimal places).
Penyelarasan Dinamik di Tempat pada Poros Bergetah Menggunakan Mesin Bubut
Penyelarasan Dinamik di Tempat pada Poros Bergetah Menggunakan Mesin Bubut
Penyelarasan Dinamik di Tempat pada Poros Bergetah Menggunakan Mesin Bubut
Kelebihan Pengimbangan Rotor pada Pelarik
Keberkesanan kos
Menggunakan mesin pelarik untuk mengimbangi mengelakkan perbelanjaan untuk membeli peralatan pengimbangan khusus.
Keselesaan
Pengimbangan boleh dilakukan secara langsung semasa proses pembuatan rotor, mengurangkan masa pengeluaran.
Kualiti Tinggi
Pengimbang mudah alih moden, seperti Balanset-1A, memberikan ketepatan pengimbangan yang tinggi, membolehkan tahap getaran rendah dan kualiti produk yang dipertingkatkan.
Kesimpulan
Pengimbangan rotor pada mesin pelarik ialah penyelesaian yang berkesan dan menjimatkan untuk perniagaan yang ingin meningkatkan kualiti produk dan mengurangkan kos pengeluaran. Penggunaan pengimbang mudah alih seperti Balanset-1A menjadikan proses ini mudah dan boleh diakses, walaupun untuk bengkel kecil.
Peringatan Penting
- Untuk mencapai hasil terbaik, adalah disyorkan untuk menggunakan alat pengukur berkualiti tinggi dan mengikuti dengan ketat prosedur pengimbangan. Anda boleh menganggarkan baki ketidakseimbangan untuk rotor anda dengan kalkulator ketidakseimbangan baki (ISO 1940).
Mengimbangi rotor pada mesin pelarik ialah satu langkah ke arah masa depan pengeluaran anda, membuahkan hasil melalui peningkatan kualiti produk, pengurangan kos dan peningkatan daya saing perniagaan anda.
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