The impeller-in-drum wear test simulates the impactabrasion
wear process. The 1-h test procedure is easy to
perform but is labor-intensive compared to other typical
laboratory wear tests i.e., changing the ore media every 15
min.. The test yields fairly reproducible wear rates typically
less than 10% between duplicate tests on the same
sample.. The 1-h test provides an upper limit on the wear
rate for a material.
The multiple-hour impeller-in-drum wear test procedure
provides a more realistic value of the wear rate of a material. The steady-state wear rate is determined from
computing the cumulative mass or volume loss of a specimen
vs. time, and then performing a least squares analysis
of the data on the linear portion of the curve. This yields a
value of the wear rate after break-in has occurred for the
material. The 5-h test is considerably more labor-intensive
than the duplicate 1-h test. However, the results may be
more realistic in terms of what is actually occurring to the
material, and this value may be more feasible to use when
selecting a material for use in a given environment.
Since no commercially produced abrasive product is
used in this test, the abrasive can be obtained from the
quarry being mined or from the excavation site being
cleared. Size of the starting ore is important, as it must be
large enough to cause damage to the wear specimens in a
reasonable amount of time to be useful as a laboratory test
procedure. From this and previous studies w1–4x, a size
range of y25 mmq19 mm works well for the current
dimensions of the impeller-in-drum, producing measurable
wear in a reasonable amount of time. Thus, the impellerin-
drum procedure lends itself to performing realistic laboratory
wear studies.
Work-hardening of the wear surface is important in
arriving at a realistic understanding of the wear process
and rate. At the very least, the first hour of an impeller-indrum
wear test should be considered as the ‘break-in’
period, because the wear rate is highest and the majority of
the work-hardening occurs during that time.
The impeller-in-drum wear test simulates the impactabrasion
wear process. The 1-h test procedure is easy to
perform but is labor-intensive compared to other typical
laboratory wear tests i.e., changing the ore media every 15
min.. The test yields fairly reproducible wear rates typically
less than 10% between duplicate tests on the same
sample.. The 1-h test provides an upper limit on the wear
rate for a material.
The multiple-hour impeller-in-drum wear test procedure
provides a more realistic value of the wear rate of a material. The steady-state wear rate is determined from
computing the cumulative mass or volume loss of a specimen
vs. time, and then performing a least squares analysis
of the data on the linear portion of the curve. This yields a
ค่าอัตราการสึกหลังจากพักในเกิดขึ้นสำหรับ
วัสดุ การ 5-h ทดสอบมากขึ้น ใช้แรงงาน
กว่า ซ้ำ 1-h ทดสอบ อย่างไรก็ตาม ผลลัพธ์อาจ
มีเหตุผลมากขึ้นในแง่ของสิ่งที่เป็นจริงที่เกิดขึ้นใน
วัสดุและมูลค่านี้อาจจะมีความเป็นไปได้ที่จะใช้เมื่อ
เลือกวัสดุสำหรับใช้ในการระบุสิ่งแวดล้อม .
เพราะไม่ผลิตในเชิงพาณิชย์ abrasive ผลิตภัณฑ์
used in this test, the abrasive can be obtained from the
quarry being mined or from the excavation site being
cleared. Size of the starting ore is important, as it must be
large enough to cause damage to the wear specimens in a
reasonable amount of time to be useful as a laboratory test
procedure. From this and previous studies w1–4x, a size
range of y25 mmq19 mm works well for the current
dimensions of the impeller-in-drum, producing measurable
wear in a reasonable amount of time. Thus, the impellerin-
drum procedure lends itself to performing realistic laboratory
wear studies.
Work-hardening of the wear surface is important in
arriving at a realistic understanding of the wear process
and rate. At the very least, the first hour of an impeller-indrum
wear test should be considered as the ‘break-in’
period, because the wear rate is highest and the majority of
the work-hardening occurs during that time.
การแปล กรุณารอสักครู่..
