Stud joints

A stud joint consists of a stud - 3 (figure 4.22), a washer - 4 and a nut - 5. An opening is shown in a part 1, its diameter equals 1,1´ d_n (where d_n is a nominal diameter of a stud thread) at the structural drawing of a thread joint. Actual working length of a stud is found as a sum of the followings parameters:

L = d₁+Hn + S _w + 0.25× d_n,

where d₁ is the thickness of a connecting part, H _nis the thickness of nut, S _wis the thickness of a washer, d_n is the nominal diameter of a thread. The received sum is rounded to the nearest from the resulted standard row of workings lengths - L at table 4.10.

Table 4.10

Threaded length l₀ according to the set nominal thread diameter d_n

Working length of a stud L, mm	dn=16	dn=18	dn=20	dn=22	dn=24
	l0=L– 0,5× dn	l0=L– 0,5× dn	-	-	-
	l0=L– 0,5× dn	l0=L– 0,5× dn	l0=L– 0,5× dn	-	-
	l0=L– 0,5× dn	l0=L– 0,5× dn	l0=L– 0,5× dn	l0=L– 0,5× dn	-
		l0=L– 0,5× dn	l0=L– 0,5× dn	l0=L– 0,5× dn	l0=L– 0,5× dn
			l0=L– 0,5× dn	l0=L– 0,5× dn	l0=L– 0,5× dn

This table shows the actual value of working length L according to the threaded length l₀.

At the simplified drawing of a stud joint for the calculation of the working length of a stud - L the dependence is used: L= d₁+1,3× d_n,

where d₁ is the thickness of a connecting part, d_n is a nominal thread diameter.

The parameter 1,3× d_n approximately takes into account the structural sizes of the thickness of a washer, the height of a nut and stocked on length of a stud. For the implementation of the simplified drawing of a stud joint the followings correlations are used: D=2 ´ d_n; D_w=2,2 ´ d_n; H=0,8 ´ d_n; S_w=0,15 ´ d_n.

The structural drawing of a stud joint is shown in figure 4.22, and it is simplified in figure 4.22, b.

а) b)

Figure 4.22 – The stud joint

The parameters of a stud jack are found according to the followings dependences:

d_opening=0,85´ d_n; L_opening=L₁+0,5´ d_n.

According to these parameters a stud jack is done in figure 4.23.

Figure 4.23 – The stud jack

Дата добавления: 2014-10-15