Newsroom
VARIOUS TANK HEADS: THE ALLSTEEL ADVANTAGE
ALLSTEEL AIR DISHED & FLANGED HEADS PROCESS
Two-step process of first: air dishing, then: flanging a head
• This process requires heads to be dished only with a female die.
• The head material may be pre-polished and paper protected before air dishing
and the dished area of the head does not need to be re-polished.
• Air dished heads do not have internal stresses like spun heads.
• These heads do not have distortion problems when holes are cut in them.
• Many different sizes of heads can be made from the same female die.
• The dished head is trimmed to the required size needed to form the knuckle and
straight flange. (using a flanging machine)
• The flanging process will scuff and mark the head on the inside and outside.
• This may require the head to be re-polished in these areas if a polished head is required.
• The knuckle may be formed to meet ASME requirements for knuckle radius
along with the desired straight flange.
Generation 3 Allsteel Dishing/Forming Head Press
• gives you the capability to produce dished heads (tank ends) of stainless steel up to 0.5 inches (12mm) in thickness, or of aluminum or carbon steel up to 0.6 inches (15mm) in thickness, in diameters varying from 3 feet (900mm) minimum in the lighter materials up to 15 feet (4500mm) maximum in all above noted thicknesses.
COMPARED TO COLD FORMED “BUMPED” HEAD PROCESS
Bumped heads are formed using male and female radius dies.
This process forms a small dished area into the head at a time.
Many passes are required over the entire area until a dish is formed to the specified radius.
This process is generally used to form thicker heads.
This process is not recommended to form thin materials because the dies leave forming
marks (“fish scales”) in the head material.
After the dishing process the heads must be flanged (using a flanging machine).
The dishing and flanging process will scuff and mark the head on the inside and outside.
This will require the head to be re-polished if a polished head is required.
For thin material the polishing will not remove the forming marks and many times highlights them.
Head thicknesses will vary from 7ga. (0.1874”) to over 1/2” for carbon steel & stainless steel material.
ALLSTEEL AIR FORMED HEADS WITH KNUCKLE RADIUS
(Using over size blanks)
Air formed heads by drawing and clamping the head material over a male die.
• The flange and the knuckle radius are formed by drawing and clamping the head
material within a male-female die set.
• While the head material is clamped the dish of the head is inflated and formed
using compressed air.
• The dished head is removed from the die and the extra material is cut off.
• This cut will be done to the specified straight flange dimension.
• The dished head is now finished.
• Air formed heads are produced with the most economical process and provide a
high quality product.
• The head material may be pre-polished and paper protected before forming.
• No need to be re-polished after forming.
• Air formed heads do not have internal stresses like spun heads.
• The knuckle may be formed to meet ASME requirements for knuckle radius
along with the desired straight flange.
• Air formed heads must be formed within a male-female die set of the exact size
(diameter and knuckle radius) of the finished head to be provided.
Generation 3 Allsteel Dishing/Forming Head Press
• gives you the capability to produce dished heads (tank ends) of stainless steel up to 0.5 inches (12mm) in thickness, or of aluminum or carbon steel up to 0.6 inches (15mm) in thickness, in diameters varying from 3 feet (900mm) minimum in the lighter materials up to 15 feet (4500mm) maximum in all above noted thicknesses.
COMPARED TO COLD FORMED “BUMPED” HEAD PROCESS
Bumped heads are formed using male and female radius dies.
This process forms a small dished area into the head at a time.
Many passes are required over the entire area until a dish is formed to the specified radius.
This process is generally used to form thicker heads.
This process is not recommended to form thin materials because the dies leave forming
marks (“fish scales”) in the head material.
After the dishing process the heads must be flanged. (using a flanging machine)
The dishing and flanging process will scuff and mark the head on the inside and outside.
This will require the head to be re-polished if a polished head is required.
For thin material the polishing will not remove the forming marks and many times
highlights them.
Head thicknesses will vary from 7ga. (0.1874”) to over 1/2” for carbon steel & stainless
steel material.
ALLSTEEL AIR FORMED HEADS WITH KNUCKLE RADIUS
IN ONE HIT (Using cut to size blanks)
Air formed heads “in one hit” with precision die set and part ejection device.
The flange and the knuckle radius are formed by drawing and clamping the head
material within a male-female die set.
While the head material is clamped the dish of the head is inflated and formed using
compressed air.
The finished dished head is ejected from the die.
Air formed heads are produced with the most economical process and provide a high
quality product.
The head material may be pre-polished and paper protected before forming.
No need to be re-polished after forming.
Air formed heads do not have internal stresses like spun heads.
The knuckle may be formed to meet ASME requirements for knuckle radius along with
the desired straight flange.
Air formed heads must be formed within a male-female die set of the exact size
(diameter and knuckle radius) of the finished head to be provided.
Generation 3 Allsteel Dishing/Forming Head Press
• gives you the capability to produce dished heads (tank ends) of stainless steel up to 0.5 inches (12mm) in thickness, or of aluminum or carbon steel up to 0.6 inches (15mm) in thickness, in diameters varying from 3 feet (900mm) minimum in the lighter materials up to 15 feet (4500mm) maximum in all above noted thicknesses.
COMPARED TO COLD FORMED “BUMPED” HEAD PROCESS
Bumped heads are formed using male and female radius dies.
This process forms a small dished area into the head at a time.
Many passes are required over the entire area until a dish is formed to the specified radius.
This process is generally used to form thicker heads.
This process is not recommended to form thin materials because the dies leave forming
marks (“fish scales”) in the head material.
After the dishing process the heads must be flanged. (using a flanging machine)
The dishing and flanging process will scuff and mark the head on the inside and outside.
This will require the head to be re-polished if a polished head is required.
For thin material the polishing will not remove the forming marks and many times
highlights them.
Head thicknesses will vary from 7ga. (0.1874”) to over 1/2” for carbon steel & stainless
steel material.