Ball mill rotary kiln girth gear
Luoyang Zhongtai is the casting & forging center in
central-south China, possessing 50t electric arc furnace, 60t LF
ladle refining furnace, and 60t VD/VOD refining furnace, etc. We
can pour 350t liquid steel one time and yields more than 200,000t
of high quality liquid steel and can produce the high quality steel
of more than 260 steel grades such as carbon steel, structural
alloy steel and the structural steel, refractory steel and
stainless steel of special requirement. The maximum weight of
casting, gray casting, graphite cast iron and non-ferrous casting
is 200t, 30t, 20t and 205t separately.
Specifications Of Gear:
(1)GS42CrMo4Alloy Steel (corporate proprietary standards)
HB 220~240(2)semi-structured, Y-Spoke
(4) reasonable sealing and alignment structure of alloy steel
(corporate proprietary standards)
(1) outer steel refining (R-H argon and vacuum treatment)
(2) proprietary cold mold hanging sand technology to ensure the
casting, the teeth dense
(3) normalizing (proprietary technology) to ensure that the tooth
(4)rough hobbing, release time, repair the joint surface, then fine
(5) proprietary homemade hob fine hobbing
|(1)castings mechanical properties and chemical composition
(2) roughing after sonic testing
(3)semi-finishing, finishing after ultrasonic testing and magnetic
(4) tooth surface magnetic particle inspection, hardness test
(5)tooth tolerance check
(6) the factory assembly load test to check the accuracy of the
size of gear
The technical requirements of a large ZTIC Gear ring:
1) is pretreated before normalizing surface hardening treatment,
the hardness should HB210 ~ 250; mechanical performance are the
ultimate strength Rb 690MPa, yield stress Rs 490MPa, elongation D5
11%, reduction of area W 25% , impact toughness Ak 30J; teeth
induction hardened, hardness HRC50 ~ 55; effective hardened layer
depth 3 ~ 5mm.
2) overall ultrasonic flaw detection, internal quality should meet
two requirements GB7233-87 standard requirements; tooth and fillet
magnetic particle inspection, quality should meet two requirements
3) Note the casting is not rounded R5 ~ R10.
4) Tooth chamfer at both ends and 1 45b.5) by two and a half ring
gear tooth width of each ring coupling along the edge of a whole
ring made with high strength bolts, combined with the tooth surface
must be at the bottom center.
2 large ring gear manufacturing process
2.1 of rough
Steel casting blank is provided by CITIC Heavy Machinery Co., Ltd.
Heavy Forging plant, run by GB11352-89 standard specifies
requirements for modeling according to the casting process,
smelting, casting, hit boxes, cleaning, dressing castings;. During
inspection and acceptance by the drawings and Technical
requirements for steel blank
Checks, according JB/T6402-92 standards issued after acceptance
Crossed by drawing and stay out allowance, alignment, connection,
processing both inside and outside the circle, combining face
milling, drilling and other processes.
2.3 Exploration injury
Overall ultrasonic flaw detection, internal quality should meet the
two requirements of GB7233-87 standards.
2.4 normalizing pretreatment
Semi-ring pairs normalizing and tempering treatment, provide a good
organization for subsequent surface hardening; press drawings
deformation of the half ring gear inspection after heat treatment.
First two and a half ring is made with high strength bolts
connecting the ring as a whole, the overall process by drawing a
circle Quannei Wai teeth and upper and lower end, and then drawing
and machining milling process requirements.
2.6 Elimination of processing stress
The overall ring annealed to eliminate stress.
2.7 overall ring surface hardening
IF along the alveolar tooth surface induction hardening, hardness
HRC50 ~ 55, effective hardened layer depth 3 ~ 5mm.
2.8 Final inspection
First, the detection frequency quenching, the hardness after
tempering ring gear cogging meets the requirements of the drawings;
secondly, to detect whether the maximum outer diameter larger size
D6944 as the deformation 3mm, the mechanical correction required
until qualified; Thirdly, tooth and fillet magnetic particle
inspection, quality should meet two requirements GB/T9444-88
standard requirements; Finally, according to the drawings and
technical requirements for final inspection.