This standard specifies the quality requirements for centering and boring of ship rudders and shafting. This standard applies to centering and boring of ship rudders and shafting before boring. CB/T 3625-1994 Quality requirements for centering and boring of rudders and shafting CB/T3625-1994 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB/T 3625—94
Quality requirements for centering and boring of rudder and shafting
Issued on October 8, 1994
Issued by China State Shipbuilding Corporation
Implementation on August 1, 1995
Shipbuilding Industry Standard of the People's Republic of China
Quality requirements for centering and boring of rudder and shafting
1 Subject content and scope of application
This standard specifies the quality requirements for centering and boring of ship and shafting. This standard applies to the centering and boring of the ship's energy and shaft system. 2 Centering
2.1 Preparation before centering
2.1.1 The keel pier should be laid flat, and the support of the ship should be cancelled. 2.1.2 Avoid sunlight exposure and perturbation. The ambient temperature induction has no obvious change. CB/T 3625-94
Classification number: U06
2.1.3 Use the wire to initially locate, and assemble and weld various shaft frames, shaft shells, bases, seat plates, etc. related to the centering of the shaft system. The bulkheads and decks through which the rudder and shaft system pass should be pre-opened, and margins should be left for marking and boring. 2.1.4 After the bulkhead in front of the engine room, the connection and assembly work below the deck should be basically completed. 1 The cabinets on the structure should be completed with watertight tests. Www.bzxZ.net
2.1.5 For rudder and shaft centering, wire drawing is allowed. When centering the shaft, the center position of the shaft is determined by calculating the droop value of the wire. For longer shafts, projection illumination or a combination of projection illumination and wire drawing can be used. 2.1.6 The saw reference target used for shaft centering should be arranged behind the zero rib of the ship and away from the center of the rudder. The reference target should be arranged in the front of the engine room. The reference target should be firmly fixed. The center of the target should coincide with the theoretical center line of the shaft. The deviation should not exceed 1mm and must be approved by the inspection department.
2.1.7 The installation position of the shaft frame, shaft housing and bulkhead seat plate must be strictly positioned according to the coordinates of the center line of the shaft. The radial deviation from the size specified on the drawing should not exceed 3mm. Sufficient T-addition allowance should be left on one side of the inner hole: Sufficient flatness allowance should also be left on the front and rear end faces. 2.1.8 If there is a draft tube, the center line of the draft tube must coincide with the center line of the shaft system, and the deviation should not exceed 1/4 of the gap between the propeller and the draft tube.
2.1.9 The measuring instruments used for centering and boring must be metrologically verified and within the permitted service life. 2.2 Centering of the shaft system
2.2. 1 The distance between the projector and the reference target should be greater than 1 m+JH and it should be directly fixed on the slipway. The center of the projector should be on the extension line of the reference point (bull's eye).
2.2.2 The layout and number of projection targets should be set according to the needs of determining the center of the shaft system and marking. The bull's eye should be adjustable and its plane should be perpendicular to the body surface.
2.2.3 The projection line of the optical projector should be concentric with the reference target, and the deviation should not exceed 0.5mm). 2.2.4 Based on the shaft centerline that has passed the inspection, make the T-length mark on the front and rear end faces of the shaft housing and shaft bracket. 2.2.5 Draw the boring circle and the inspection circle on the end face of each T-hole. The axial tolerance of the boring circle and the inspection circle is 40.2tmm. 2.2.6 The steel wire is pulled with the ship's reference target as the reference of the wire. When determining the centerline, the deviation of the steel wire weight value should be considered. 2.3 Determine the centerline of the rudder system
2.3.1 The F and lower reference points of the rudder system should be marked with obvious cross lines. 2-3.2 The centerline of the rudder system should be checked before the shafting is centered; the centerline of the rudder system should intersect with the centerline of the shaft system. If they do not intersect, the deviation value should not exceed 3mm. China State Shipbuilding Corporation approved on October 8, 1994 and implemented on August 1, 1995. The deviation between the angle of the two center lines and the theoretical angle should be less than 1mm/m. For the center lines of each energy system of the multi-energy, no displacement is allowed. 2.3.3 The energy system pull line is used to find the centering plate. The inclination, thickness of the energy bearing plate and the actual length of the upper and lower energy bearing center and rudder are all based on the qualified acceptance of the pull line and are obtained by on-site measurement. 2.3.4 On the end face of each T-hole 1: mark the boring circle and the inspection circle. The coaxiality tolerance of the boring circle and the inspection circle is 40.2mm. 3 Boring holes
3.1 Preparation work before boring
3.1.1 The installation of the boring bar must be concentric with the center of the energy or shaft system, and its coaxiality tolerance is recommended to be 40.01mm. 3.1.2 The mechanical device of the transmission boring bar is directly fixed on the body of the T-piece. Otherwise, an effective flexible transmission device should be adopted. 3.1.3 Before machining, check the machining surface determined by projection lighting or wire drawing, and the cutting map mark should be clear; the support of the boring bar should be firm and reliable.
3.2.1 Cutting is divided into roughing, finishing and finishing 1.2 processes. 3.2.2 The roughness R of the cutting surface after roughing T should not be greater than 12.5μm. A cutting allowance should be left on one side of the inner hole. 3.2.3 According to the inspection network, recalibrate and adjust the boring bar. The recommended axial tolerance is 40.03~40.10mm, and then carry out finishing. 3.2.4 Double-knife cutting can be used for boring the inner hole. The surface roughness R value after finishing should not be greater than 3.2μm. The contact part of the sealing ring must not be allowed to be connected after boring. 3.2.5 The center of the bell hole of the precision machining L. If the end face is marked for inspection, its coaxiality tolerance should not be greater than 0.5mm. 3.2.6 After the inner hole boring is qualified, the end plane can be cut, and its shape shall be in accordance with the application drawing; the boring plane must be perpendicular to the center line, and the verticality tolerance should not exceed 0.1mn/m
3.2.7 The cylindricality and roundness tolerance of the inner hole of the front extension shaft after machining should not be greater than the tolerance zone H9 of its hole size. Its roundness tolerance is generally as shown in the table below, and the coaxiality tolerance should not be greater than 0.08mm. 3.2.8 The cylindricality and roundness tolerance of the upper and lower rudder bearing holes with T. should not be greater than the tolerance zone H9 of its hole size. Its roundness tolerance is generally as shown in the table below, and the coaxiality tolerance should not be greater than 0.01mm. mm
≥120~180
2:180~260
2-269~360
3360~-500
500-700
7U0--900
Valve tolerance
3.2.9 The upper and lower bearings, base panels, and the front and rear planes of the shaft shell shall be processed according to the requirements of the processing drawings. The surface roughness R. value shall not exceed 12.5 μm:
Additional instructions:
This standard is proposed by China State Shipbuilding Corporation. CB/T 3625-94
This standard is under the jurisdiction of the 603 Institute of China State Shipbuilding Corporation. This standard was drafted by Hudong Shipyard. The main drafters of this standard are Tang Yuxian and Hu Tongxing. 3
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