BG Wagon Underframe Design
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Questions and Answers

What is the primary function of the underframe in a wagon?

  • To provide aesthetic appeal to the wagon
  • To support the load and distribution of forces (correct)
  • To enhance the speed capabilities of the wagon
  • To facilitate the assembly of different wagon components

    • Which of the following components is NOT a main member of a conventional BG wagon underframe?

  • Sole bars
  • Cross bars
  • Axle (correct)
  • Head stock

    • What role do gusset plates and knees serve in the underframe's construction?

  • They impart additional strength to the joints (correct)
  • They provide aesthetic design features
  • They add weight to the underframe
  • They are used to create additional loading surfaces

    • How is the load transferred to the bogie frame in bogie wagons?

    <p>By means of a pivot arrangement</p> Signup and view all the answers

    What determines the permissible wheel base of a bogie wagon?

    <p>The type of loading pattern and quantum</p> Signup and view all the answers

    Which aspect is critical in designing the underframe to handle buffing loads?

    <p>The arrangement and distribution of cross members</p> Signup and view all the answers

    In the context of the underframe design, what does the term 'loading per meter' refer to?

    <p>The amount of load supported by each meter of the underframe</p> Signup and view all the answers

    What is primarily used for joining underframe members in modern wagons?

    <p>Welding</p> Signup and view all the answers

    What feature is added to under-frames during manufacturing to prevent sagging under load?

    <p>Initial camber</p> Signup and view all the answers

    Which term describes the strong cross members found in bogie wagons?

    <p>Bolsters</p> Signup and view all the answers

    What is the permitted tolerance for the inside length of riveted wagons?

    <p>+5 mm and -5 mm</p> Signup and view all the answers

    Which of the following is NOT a permitted tolerance in new wagon construction for inside dimensions?

    <p>+4 mm for inside width</p> Signup and view all the answers

    What is essential for the under-frame and all its members to ensure quality and safety?

    <p>True and square conformance</p> Signup and view all the answers

    What is the maximum permitted difference between the diagonals of the under-frame?

    <p>5 mm</p> Signup and view all the answers

    What aspect of the under-frame is critical to comply with during manufacturing tolerances?

    <p>Manufacturing precision</p> Signup and view all the answers

    What was the joining method used in earlier wagons before welding was adopted?

    <p>Riveting</p> Signup and view all the answers

    What material is primarily used for sole bars in most bogie wagons?

    <p>ISMC-250x9.0 web channel of copper bearing mild steel</p> Signup and view all the answers

    What is a necessary condition for patching a sole bar according to IRCA standards?

    <p>Each patch must be riveted to the sole bar web and flange.</p> Signup and view all the answers

    What method is used to repair slightly bent sole bars?

    <p>Local heating and straightening.</p> Signup and view all the answers

    Where does damage to sole bars typically occur?

    <p>Adjacent to head stock stanchions at the door location.</p> Signup and view all the answers

    Which of the following statements about patch repairs is correct?

    <p>When inner and outer patches cannot be fitted, only one may be used.</p> Signup and view all the answers

    What is the maximum allowable tolerance for the length of a barrel measured over the centre of the two dished ends?

    <p>+10 mm/-3 mm</p> Signup and view all the answers

    Which of the following is NOT a tolerance for the distance between door center line to the center line of door hinge?

    <p>+2 mm</p> Signup and view all the answers

    What is the tolerance for the door length?

    <p>+5 mm</p> Signup and view all the answers

    What is the tolerance for the distance between bogie pivot centers when riveted?

    <p>+3 mm</p> Signup and view all the answers

    How much is the tolerance for the distance between stanchions at the body side?

    <p>+3 mm</p> Signup and view all the answers

    Which of the following indicates a negative tolerance for coupler height from the bogie top pivot when bogies are provided as free supply items?

    <p>-3 mm</p> Signup and view all the answers

    What is the tolerance for the distance between bogie pivot centre and adjacent headstock?

    <p>-2 mm</p> Signup and view all the answers

    What is the tolerance for the door opening, both vertical and horizontal?

    <p>-3 mm</p> Signup and view all the answers

    What is the tolerance for door width?

    <p>+3 mm</p> Signup and view all the answers

    What tolerance applies to the distance between the bogie pivot centers when welded?

    <p>+5 mm</p> Signup and view all the answers

    What is the plate thickness of the Cross Bar?

    <p>5/8 mm</p> Signup and view all the answers

    Which component of the wagon has a specified thickness of 10 mm?

    <p>Head Stock</p> Signup and view all the answers

    Which type of wagon is associated with the underframe arrangement shown in Fig. 5.4?

    <p>Type BOXNHL</p> Signup and view all the answers

    What is the main structural feature associated with the underframe of a bogie open wagon?

    <p>Bogie centres</p> Signup and view all the answers

    Which figure represents the underframe of the Bogie Covered Wagon Type 'BCNHL'?

    <p>Fig. 5.5</p> Signup and view all the answers

    What is the specified length over the bogie centres in the underframe content?

    <p>6524 mm</p> Signup and view all the answers

    What is not a part of the underframe components mentioned?

    <p>Wheel Assembly</p> Signup and view all the answers

    Which figure depicts the arrangement for the Bogie Open Wagon Type 'BOXN'?

    <p>Fig. 5.3</p> Signup and view all the answers

    What is the primary focus of Chapter 5 in the document?

    <p>Underframe structures</p> Signup and view all the answers

    Which of the following types is NOT mentioned in the underframe content?

    <p>BOGIE</p> Signup and view all the answers

    What contributes to the overall strength and load distribution of the wagon underframe?

    <p>Diagonal members and gusset plates</p> Signup and view all the answers

    Which statement accurately reflects the design considerations for an underframe?

    <p>The pattern of loading directly influences the underframe dimensions.</p> Signup and view all the answers

    Which underframe member primarily provides strength against diagonal deflections?

    <p>Gusset plates</p> Signup and view all the answers

    What is the role of the bolster in a conventional underframe design?

    <p>It provides lateral stability to the bogie frame.</p> Signup and view all the answers

    How is excessive load on an individual member of the underframe controlled?

    <p>Uniform distribution of loads across all members</p> Signup and view all the answers

    Which of the following components are integral for absorbing and distributing buffing loads?

    <p>Gusset plates and knees</p> Signup and view all the answers

    What is the main purpose of using rolled/CRF sections in the construction of underframe members?

    <p>To enhance the load-bearing capacity and structural integrity</p> Signup and view all the answers

    What is a required characteristic of patches used for repairing sole bars?

    <p>They must be riveted to the sole bar web and flange.</p> Signup and view all the answers

    What is the preferred method for repairing cracks that extend to the webs of sole bars?

    <p>Electric welding with proper support patches.</p> Signup and view all the answers

    In which scenario may only an outer patch be fitted on a sole bar?

    <p>When inner and outer patches cannot be fitted due to other fittings.</p> Signup and view all the answers

    What type of steel is used for sole bars on BOXNCR wagons?

    <p>IRSM-41 carton steel.</p> Signup and view all the answers

    What material thickness is specified for the outer patch covering a crack?

    <p>At least 10 mm.</p> Signup and view all the answers

    What is the tolerance for the length of a barrel measured over the centre of the two dished ends?

    <p>+10mm/-3mm</p> Signup and view all the answers

    When considering the door length in wagon design, which of the following tolerances is accurate?

    <p>+5mm</p> Signup and view all the answers

    What is the permitted tolerance for the distance between the bogie pivot centres in a riveted design?

    <p>+2mm</p> Signup and view all the answers

    Which tolerance applies to the coupler height from rail level in the case where the bogies are fabricated by the wagon builder?

    <p>+0mm</p> Signup and view all the answers

    What is the tolerance for the body side distance between stanchions?

    <p>+3mm</p> Signup and view all the answers

    Which of the following tolerances is correct for the vertical or horizontal door opening?

    <p>-3mm</p> Signup and view all the answers

    What tolerance applies to the distance from the door centre line to the centre line of the door hinge?

    <p>+1.5mm</p> Signup and view all the answers

    What is the tolerance for the distance between the stanchions at the body end?

    <p>+1.5mm</p> Signup and view all the answers

    Which tolerance is stated for the coupler height from the bogie top pivot when bogies are provided as free supply items?

    <p>-3mm</p> Signup and view all the answers

    What is the specified thickness of the bolster in the underframe components?

    <p>10/12 mm</p> Signup and view all the answers

    Which wagon type is illustrated in Fig. 5.5?

    <p>Bogie Covered Wagon Type 'BCNHL'</p> Signup and view all the answers

    Which component of the wagon has a specified thickness of 10 mm?

    <p>Head Stock</p> Signup and view all the answers

    What does Fig. 5.2 show in relation to bogies?

    <p>Underframe of the Bogie Open Wagon</p> Signup and view all the answers

    In which figure is the arrangement for the Bogie Open Wagon Type 'BOXNHL' presented?

    <p>Fig. 5.3</p> Signup and view all the answers

    What is a unique feature of the underframe shown in Fig. 5.4?

    <p>It is for a Bogie Covered Wagon</p> Signup and view all the answers

    What is identified as the 'length over heads' in the content?

    <p>10713 mm</p> Signup and view all the answers

    Which term refers to the specific distance measured between bogie pivot centers?

    <p>Bogie Base</p> Signup and view all the answers

    Which of the following is NOT mentioned as a feature of the underframe arrangement in the manual?

    <p>Adjustable heights</p> Signup and view all the answers

    What is the purpose of providing a positive camber in the underframe of a bogie wagon?

    <p>To prevent sagging after loading in service.</p> Signup and view all the answers

    What modification was requested by RDSO to address issues observed in BRN wagons?

    <p>Modifications to prevent breakage of fixed ends and sagging.</p> Signup and view all the answers

    During periodic overhauls, what is a common requirement for damaged head stock pressings?

    <p>They should be stripped, straightened, and refitted.</p> Signup and view all the answers

    What action is recommended when cracks develop at the side bearer location on the underframe bolster bottom flange?

    <p>Follow the repair procedures provided in RDSO technical pamphlets.</p> Signup and view all the answers

    What is the specification for repairing damaged centre sills on bogie wagons?

    <p>Repairs should be done according to RDSO Drg.No.WD-99031-S-1.</p> Signup and view all the answers

    What is the consequence of not addressing damages to the underframe during periodic overhauls?

    <p>Increased risk of serious failures while in service.</p> Signup and view all the answers

    What should be kept in stock to efficiently handle head stock pressing repairs?

    <p>Spare head stock pressings.</p> Signup and view all the answers

    What design aspect of bogie wagons makes them susceptible to cracks at certain locations?

    <p>The length of the underframe compared to four wheelers.</p> Signup and view all the answers

    In case of significant damage, what is the recommended action for the head stock pressings?

    <p>Replace the damaged ones with new pressings.</p> Signup and view all the answers

    What is a critical procedure for re-cambering of bogie wagons as per the guidelines?

    <p>Following the procedure in RDSO pamphlet No.G-107.</p> Signup and view all the answers

    Study Notes

    General Underframe

    • Underframes are the main load-bearing part of wagons, directly impacting overall design and dimensions.
    • Loading per meter and track limitations are key design factors.
    • Buffing and impact loads also influence underframe strength calculations.
    • Pivot arrangements are critical for load transfer to bogie frames in bogie wagons.

    BG Wagon Underframe Construction

    • Main Members: Includes sole bars, head stocks, longitudinal members, cross bars, bolster, floor, crib angle, end angle, gusset plates, and knees.
    • Structure: Typically consists of two outer longitudinal members (sole bars), two head stocks, strengthened by middle longitudinals and cross members.
    • Gusset plates and knees: Protect against diagonal deflection, distributing buffing loads.
    • Material: Various rolled/CRF sections (channels, Z-sections, hat sections) are used, with welding commonly employed for joining.
    • Bogie Wagons: Bolster cross members are stronger in bogie wagons.
    • Underframe camber: Underframes are initially cambered to prevent sagging under load.
    • Tolerances: Specific tolerances are permitted during construction for inside length, width, height, distances between bogie pivots, and stanchions, door openings, lengths, widths, and coupler heights.

    Wagon Construction Tolerances

    • Inside length: +5mm (riveted), +7mm (welded)
    • Inside width: +3mm
    • Inside height: +3mm
    • Difference between diagonals (+/- measurements for under frame, body side, body end, door opening, and doors)
    • Distance between bogie pivot centres (+/- measurements for riveted and welded)
    • Distance between bogie pivot centre and adjacent headstock (+/- measurements)
    • Door opening (vertical or horizontal): (+/- measurements)
    • Door length: (+/- measurements)
    • Door width: (+/- measurements)
    • Distance between door center line and door hinge center line (+/- measurements)
    • Coupler height from rail level (+/- measurements)
    • Coupler height from bogie top pivot (+/- measurements)
    • Non-pressure tank wagon barrel tolerances (+/- measurements)

    Other Major Sub-Assemblies

    • Draw gear/CBC sub-assembly
    • Containers locking/anchoring arrangements (container flats)
    • Side stanchions & lashing chains
    • Door operating mechanisms (hopper wagons)
    • Top centre pivot

    Underframe Maintenance

    • Underframes are subjected to static and dynamic loads, including track unevenness and buffing impacts from marshalling
    • Regular maintenance is crucial for smooth operation.
    • Inspection is required for rivet/bolts, cracks, and alignment.
    • Repairs are critical for damaged components, head stocks, centre sills, and sole bars, with repairs following specific procedures as outlined.
    • Specific types of wagons (open, covered, brake vans) might have unique repair requirements.

    Additional Information

    • Diagrams (figures) accompany the text, illustrating specific underframe components and dimensions.

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    Related Documents

    CnW Maintenance Manual Chapter 5 - Underframe PDF

    Description

    This quiz explores the intricate details of the BG wagon underframe construction and design. It covers the essential components, load-bearing structures, and material specifications that play a crucial role in wagon safety and efficiency. Test your knowledge on load calculations, structural integrity, and the essential parts of underframe design.

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