Punch Units
PAT.P
Example of punch unit installation   Features   ●This new type punch unit is simplified by mounting directly in the pad. This enables the designers to reduce the stamping process. ●Easy pierce punch adjustment. ●Applying a non traditional principle of piercing, the hole diameter is determined in accordance with combination of a punch diameter and a button die hole diameter. Front side of the pad (Front surface of the structure) Back side of the pad ●Easy handling due to its compact size and light weight. ●Round hole punches from 4.5mm ～ 21mm diameter are available.
Structure
●This unit consists of the following five components: ① Slide, ② Unit punch, ③ Case, ④ Spring, and ⑤ Stopper bolt. You can disassemble this unit by removing the stopper bolt.
Example of reducing the process
Hole piercing method
This unit has a punch with a projection at the end and round shoulders. It makes holes by using this new punching mechanism. The following section describes about the hole piercing mechanism.
End structure of the piercing-type punch
With a conventional punch, punching is a shearing process. However, with piercing-type punch, “ripping down” is the most suitable expression for punching. With a conventional punch, a punch edge and a dice edge work as origin points from front and rear sides of the panel respectively. These edges make cracks on front and rear sides of the panel, and a hole is made by uniting these cracks. To succeed to unite the cracks properly, clearance between the punch edge and the dice edge has to be very small. On the contrary, with a new piercing-type punch, the punch shoulders have a round shape. Therefore, cracks do not occur by the punch but only by the dice edge. This new punch makes a hole by stretching (tearing) the crack until it reaches to the front surface of the panel. With this punch, holing depends only on dice edges. Therefore, unlike conventional punches, adjustment between cracks on front and rear sides of the panel becomes unnecessary. Thus, the large clearance between the punch and the dice becomes available, and furthermore, some deviation is also acceptable.
Clearance Small Large Deviation between punch & die 0.01mm～0.02mm max 0.2mm Punch allignment hard easy (unnecessary)
Difference of principles between the conventional holing and the piercing-type holing
● Hole piercing process using the piercing-type punch
①The projection at the end bursts through the panel.
②The panel stretches, and weak points that contact the dice edge start to break.
③The breaking area is broadened with the dice edge.
④The projection at the end hitches and tears off the scrap from the panel.
⑤The torn scrap is pushed into the die by the punch (completion of holing).
⑥The scrap falls down.
◎Precautions (Regarding die design)
●Select a flat type (OPF～) or an inclined type (OPA～) in accordance with a work angle. 　Refer to Selecting method on the page 572.
●Installation dimension of the unit (case-holding length) 　For installation dimension of the unit, refer to the following figures for processing.
Parts No. A B C D OPF/OPA 5.5 35~45 19 23.5G7 28 OPF/OPA 6.5 20 25.5G7 30 OPF/OPA 8.5 21 27.5G7 32 OPF/OPA 10.5 22 30.0G7 35 OPF/OPA 13.5 24 34.0G7 39 OPF/OPA 16.5 26.5 39.0G7 44 OPF/OPA21.0 45~55 29 44.0G7 48
●Set the punch unit as the punch becomes perpendicular to the dice surface.
●Keep the dice surface flat. 　In case the dice surface is not flat enough, it is hard to make a proper hole.
●Set as some clearance exists between the unit and the panel. 　Do not use the unit as a panel retainer.
●To prevent the pad being lowered during empty punching, use the pad balancer (spacer). 　During punching operation, the punch contacts the lower section of the die.
●Attach sensors (panel loading switch, unloading switch, etc.) to the unit to prevent punching two pieces of panels together or to prevent tucking a foreign object. During punching operation, the punch contacts to the upper section of the die.
●Scraps tend to remain when the work angle is from 0 to 30. In that case, the following dice types are recommended.
Conventional dice (d indicates the dice inner diameter.) When the angle is small, scraps may rolls out.     Dice with a countermeasure for rolling-out scraps A squeeze is installed at the back section of the dice edge, holding scraps.
●For the sliding section at the driver side, using a #2000 (sintered) wear plate is recommended.
●When a wear plate is not used for the sliding section at the driver side, set the roughness of the sliding surface at Ra = 1.6 or smaller.
◎Precautions (Die manufacturing, productions)
●Conduct the sliding operation of the pads. However, before sliding and adjusting the pads, be sure to remove the punch unit.
●Before conducting the initial punching, be sure to confirm the deviation between cores of the punch and the die.
●Do not pad-lock the unit. 　(When the upper die is lifted with the unit being pad-locked, the unit gets damaged with the punch stayed inside of the dice.
The punch stays inside of the dice; therefore, the unit gets damaged by lifting the upper die.
●Apply an agent to prevent loosening of the fixing bolts.
●Adjust the contacting condition of the sliding section.
●When a height of the projection is insufficient due to breakage, the scrap cannot be held and holing becomes unavailable.
Type
OPF series (flat type)	OPA series (inclined type)
Table of machining abilities
Parts No. Punch diameter (mm) P Maximum stroke (mm) Unit (mm) Flat type W1 W2 L OPF 5.5 4.5~5.5 9.5 27.5 40.8 78.5 OPF 6.5 5.6~6.5 10.0 29.5 42.8 79.0 OPF 8.5 6.6~8.5 10.5 31.5 44.8 79.5 OPF 10.5 8.6~10.5 11.5 34.0 47.0 80.5 OPF 13.5 10.6~13.5 11.5 38.0 51.0 80.5 OPF 16.5 13.6~16.5 12.0 43.0 56.0 81.0 OPF 21.0 16.6~21.0 14.0 48.0 61.0 93.0
Parts No. Punch diameter (mm) P Maximum stroke (mm) Unit (mm) Inclined type W1 W2 L OPA 5.5 4.5~5.5 9.5 27.5 40.8 86.4 OPA 6.5 5.6~6.5 10.0 29.5 42.8 87.3 OPA 8.5 6.6~8.5 10.5 31.5 44.8 88.1 OPA 10.5 8.6~10.5 11.5 34.0 47.0 91.6 OPA 13.5 10.6~13.5 11.5 38.0 51.0 92.3 OPA 16.5 13.6~16.5 12.0 43.0 56.0 95.7 OPA21.0 16.6~21.0 14.0 48.0 61.0 108.7
Selecting method
●Select a flat type (OPF～) or an inclined type (OPA～) in accordance with the process angel.
page top
Die & Mold Top | OILES Bearing TOP