ASME B5-60-2002 pdf free download.Power Presses: General Purpose, ? Single Action, Straight Side Type
1.1 Scope This Standard applies to hydraulic and mechanical power presses commonly referred to by the metal- working industry as General Purpose, Single Action, Straight Side Type Power Presses that, by means of dies or tooling attached to the slide and bolster, are used to shear, punch, form, or assemble metal or other materials. The following types of presses are excluded from this Standard:
(a) air (pneumatic)
(b) bench
(c) eyelet machines
(d) forging
(e) four slide machines
(f) gap frame
(g) knuckle joint
(h) multiple action
(i) multiple slide
(j) spotting
(k) transfer feed
(l) turret punching
1.2 Purpose
The purpose of this Standard is to define and describe power presses and their interface, and to permit inter- changeability of bolsters, dies, and tooling components between presses of comparable type, size, and capacity.
1.3 Application Any power press described herein and referred to as an American National Standard Power Press shall comply with the applicable requirements delineated in this Standard.
2 DEFINITIONS AND TERMINOLOGY Terms used in this Standard are defined in ASME B5.49, Glossary of Power Press Terms.
3 METRIC/U.S. CUSTOMARY RATIONALIZATION
3.1 Metrication All units of dimension and capacity stated herein are in accordance with ASME B5.51M, Preferred SI Units for Machine Tools. Approximate U.S. Customary units are historical standards and are for reference only. Wher- ever used in this Standard, the unit tons denotes U.S. tons.
3.2 Metric/U.S. Customary Conversion Nonmandatory Appendix A provides conversion multipliers applicable to this Standard.
4 PRESS CHARACTERISTICS
4.1 Rated Capacity Standard capacity ratings shall be as specified in Table 1 (see also Fig. 1). See Nonmandatory Appendix B for historical comparison of capacity ratings.
4.2 Rating Points (Mechanical Power Press)
(a) Standard rating points shall be as specified in Table 2.
(b) Drive design shall be based on providing the torque, which produces the rated press capacity at the rating point (see Fig. 2).
(c) Press capacity at points other than the rating point are shown in (1) Mandatory Appendix I for presses rated at 12.7 mm ( 1 ⁄ 2 in.)
(2) Mandatory Appendix II for presses rated at 6.3 mm ( 1 ⁄ 4 in.)
4.3 Energy Capacity (Mechanical Power Press) 4.3.1 Function of the Flywheel. The energy required forperformingpress operations is stored inthe flywheel. During the working portion of the press cycle, the fly- wheel slows down as it supplies the required energy to the drive train.
4.3.2 Function of the Drive Motor. The drive motor restores flywheel energy during the nonworking portion of the press cycle, which may include the interval between press cycles for presses operating in single stroke modes.
4.3.3 Drive MotorSelection. The selection ofthe drive motor is dependent upon the energy requirements. Factors determining the energy requirements are: (a) rated capacity (b) press speed (strokes per minute) (c) press stroke Based on the optimum slide velocity for the material being worked, a longer stroke press will be required to operate at a slower speed than a shorter stroke press. The longer the stroke, the deeper the draw that can be made, and the greater the energy required to sustain the press through the depth ofthe draw. Table 3 specifies typical press speed/drive motor relationships.
4.3.4 Drive Motor/Flywheel Relationship. The usable energy that a flywheel can supply is a function of the ability of the drive motor to tolerate slowdown without overheating. The usable flywheel energy, expressed as a percentage of total flywheel energy, is a function of the motor slowdown. Table 4 specifies the properties of the three types of single speed drive motors that are most commonly used on mechanical power presses. Mandatory Appendix IV provides a method for calculat- ing the usable flywheel energy.
4.3.5 Variable Speed Presses. Unless otherwise specified by the purchaser, usable flywheel energy for vari- able speed presses shall be rated at one-half the maximum speed.ASME B5-60 pdf download.ASME B5-60-2002 pdf free download
