| 摘要 |
<p>The invention relates to a process for obtaining a straight hammer used as tamping bit to be mounted on the equipments used for the railway tamping operations. According to the invention, the process consists of the following stages: from a rolled round steel with the diameter D= 90 mm there is cut a bar (a) of the length L=460 ± 0.8 mm which is secured in the chuck of a parallel lathe and a centring hole (b) and a turning of a diameter Dx c is machined in point (O) on the axis (OO), the centring holes (d and e, respectively) with the axes parallel and placed on the vertical at a distance (f) from one another, are machined in the points (Oand O), the centring hole (d) is enlarged to the dimension PHI = 18 x 45 mm and it is screwed in M 20 x 1,5, then a tapered turning of a length (g) of the surface (A) is performed and it is ground up to the tapering 1:k1, the part is moved onto the table of a vertical cutter where is is gripped in the vice, two diametrically opposed channels are carried out on the MORSE cone and are ground to the MORSE 6, the part being then transferred onto the table of a vertical cutter to machine a recess (C) for the tappet, the part being transferred on a parallel lathe and it is secured to the end of the centring hole (b) in (O), in the special tapered point which is mounted in the universal lathe chuck, and with the centring hole (e) in (O) the point of the spindle of the movable poppet there generating surface (D), the part is transferred into the table of the vertical cutter, it is gripped in the vice and thereafter the milling of the surface (E).</p> |
