$10\mathrm{.}1\mathrm{.}1$ Clamping device $($B$,$ L$3,45$min$)$

The picture shows a clamping device in which the work pieces $($part $1)$ are fixed by force applied to

an eyebolt $($part $4,$ DIN $444-$ BM $12\backslash$times $150-4\mathrm{.}6).$ A pressure distribution element $($part $2)$ which is

pivot$-$mounted in an angle lever $($part $3)$ transfers to applied force to the work piece.

In between the parallel pin $($part $5,$ unhardened pin ISO $2338-12h832-St,R_{mN}$~~$400\frac{N}{m}{m}^2)$ and

the eyebolt $($part $4)$ a clearance fit $($H$9/$h$8)$ is provided while between the parallel pin and the angle

lever $($part $3)$ a shrink fit $($N$7/$h$8)$ is required. The parallel pin $($part $6,$ unhardened pin ISO $2338-$

$16h832-St,R_{mN}$~~$400\frac{N}{m}{m}^2)$ has clearance to the angle lever $($fit E$8/$h$8)$ and is fixed in the bearing

eye $($part $7,$ fit N$7/$h$8).$ The Material of angle lever and bearing eye is S$235$JR$.$

Pin joint A:

Pin joint B:

pin ISO $2338-12h832-$ St

pin ISO $2338-16$h$8$x$32-$St

Pin $(5)-$ clevis $(3)$: shrink fit N$7/$h$8$

Pin $(6)-$ clevis $(3)$: clearance fit E$8/$h$8$

Pin $(5)-$ blade $(4)$: clearance fit H$9/$h$8$

Pin $(6)-$ blade $(7)$: shrink fit N$7/$h$8$

a$)$ Which clamping force $F_A$ may be applied with regard to the load in pin joint $A($assume

frequent operation and shock$-$free clamping$)?$

b$)$ Is pin joint $B$ dimensioned adequately for the applied clamping force $F_A?$

Solution:

a$)F_{\text{A}\text{m}\text{a}\text{x}}=7755N$

b$),{}_b=48\frac{N}{m}{m}^2,{}_{\text{m}\text{a}\text{x}}=37\frac{N}{m}{m}^2,p=66\frac{N}{m}{m}^2$

Joint $B$ is dimensioned properly!