A blanking tool consists of:
1. Top plate
2. Bottom plate
3. Punch
4. Die
5. Stripper
6. Punch holder
7. Thrust plate
8. Guide pillar
9. Guide bush
10. Shank
Top Plate
This is the plate on which the punch holder is fixed.The top plate also holds the shank and the bushes.Top plate absorbs the stock resulting due to the cutting action.
Bottom Plate
It is the base of the tool.The die and pillars are fitted to this plate.The opening for the blank is made in this plate.The opening should be simple in profile and at the same time provide enough support to the die.
Punch and Die
They are the cutting elements of a blanking tool.They are made of high carbon high chromium steel and are hardened and tempered to 58-62 HRC.
Stripper
Its main function is to strip the stock scrap off the punch and to guide the punch into the die.
Punch Holder
Punch is fitted to the punch holder with a light press fit(H7/m6).It is made of mild steel.
Thrust Plate
While performing the cutting the punch will exert an upward thrust.So the punch should be backed by a hardened(45 - 50 HRC) plate to avoid digging on the top plate.For this purpose the thrust plate is used.
Guide Pillars and Bushes
They are used to achieve a well guided movement of the moving part with respect to the fixed part.
Shank
Shank connects the top half of the tool to the press ram.It is screwed on to top plate.
Screws
It is the main fastening member which holds the plates together.The number of screws and its size is decided depending upon the size of the tool and load acting on tool.
Dowels
Dowels are the main locating members.They locate the plates accurately in position.