Straight-sided presses

Straight-sided presses sacrifice adaptability and accessibility to gain frame rigidity and are best suited to work on heavy-gauge metals and on large surfaces. Since the sides are closed by the side frames and are open at the front and the back, these presses are limited to operation from the front only. 

Gap-style presses and straight-side presses are the two most utilized frames available today. The press room with gap frames normally uses this style as hand-fed and or secondary operations (e.g., staking and assembly). Single-point presses are utilized for lower-precision parts or are used where the gapping frame and therefore the angle that occurs between the punch and die during impact does not negatively affect the part. 

The C-frame press (Fig. 1) is desirable because the die space is readily accessible on three sides for loading the blank and unloading the part. The C-frame press is undesirable because the frame has an angular deflection not associated with column or straight-side presses. This angular deflection can be detrimental to certain tools, particularly those with close die clearance. 

Straight-side presses (Fig. 3) can take several forms and construction details vary among manufacturers. One common characteristic is that the slide is guided by... 

The frame construction of straight-side presses takes two common styles ... 

Figure 3 Straight-side press with two double-acting cylinders and a rolling bolster.

This is achieved in the other main type of power press - the straight-sided or column type - since the large forces are taken up in a vertical direction by the side frames. A mechanical straight-sided press of 3000kN ( 300 tons ) capacity is shown in Fig. 17.3. 

Straight-sided presses sacrifice adaptability and accessibility to gain frame rigidity and are best... 

Figure 16.3. Mechanical straight-sided power press...

Advantages of the single-point gap-frame, presses are ease of access to the die area for both part loading and unloading and, generally speaking, they are more economical than straight-side styles. (See Fig. 2.)... 

The straight-side style of design creates a resistance to the twisting action of a frame caused by unequal loading within the press and fights the tendency for the frame sides to stretch unequally. 

Hydraulic presses are available with three basic frame types—C frame (or gap frame), round column, and straight side. 

Figure 17.4 Hydraulic straight-sided power press 17.1.3 Safety...

UOE pipe is made from plate. After being subjected to automatic ultrasonic inspection, each plate is trimmed and beveled on the side edges and then transferred to a IMng press where it is formed into a U-shape. It is subsequently formed into a round shell on an O-ing press. The straight seam is submerged arc welded from both the... 

To Make Slow Match.—Dissolve 1 drra. nitrate of lead in H oz. boiling water. Cut a sheet of blotting paper in six equal parts, and wet them on both sides, with a sash tool, with the solution. When dry, paste a piece all over, and upon it smoothly press another piece upon this, pasted, put a third piece and so on, till all the six form a stiff board, iky them under a heavy weight and, when dry, with a sharp knife and straight edge, cut the whole into strips a quarter of an inch broad. Four inches will burn about a quarter of an hour. Narrow tape, boiled in the solution, makes excellent slow match. 

---