Metal-forming machine in particular a forging press
View Patent ↗A frame of a metal-forming press having upper and lower traverses interconnected by vertical columns having upper and lower ends is provided with respective sets each of a plurality of identical tension bolts at each end of each of the columns. The traverses are formed at each end of each column with an array of throughgoing holes through each of which a respective one of the bolts extends, and the columns have opposite ends each formed with an identical array of blind threaded bores each in turn aligned with a respective one of the throughgoing holes. Each bolt has an inner end seated in a respective on of the bores of the respective column end and an outer end bearing inwardly on a face of the respective traverse.
1. In forging press, a frame comprising:
upper and lower traverses having respective downwardly and upwardly open blind seat bores and formed at each of the seat bores with an array of vertically throughgoing holes opening into the respective seat bores;
vertical columns having upper and lower ends seated in the seat bores of the upper and lower traverses and each formed with upwardly and downwardly open internally threaded blind bores; and
respective sets at each end of each of the columns of a plurality of identical tension bolts each extending through a respective one of the holes and having an inner end seated in a respective one of the threaded blind bores of the respective column end and an outer end bearing inwardly on a face of the respective traverse.
2. The frame defined in claim 1 wherein the press operates with a force of at least 80 NM.
3. The frame defined in claim 1 wherein the threaded blind holes each have a length of no more than 20% of that of the respective column.
4. The frame defined in claim 3 wherein the length of the threaded blind bores is no more than 10% of the column length.
5. The frame defined in claim 1 wherein there are at least five such bolts, holes, and threaded blind bores at each end of each column.
6. The frame defined in claim 1 wherein there are at least ten such bolts, holes, and threaded blind bores at each end of each column.
7. The frame defined in claim 1 wherein the columns are centered on respective axes and the holes and threaded blind bores are oriented in arrays centered on and around the respective axes.
8. The frame defined in claim 7 wherein the arrays are circular and the holes and threaded blind bores are angularly equispaced.
9. The frame defined in claim 8 wherein there are two such concentric circular arrays of holes and threaded blind bores at each column end.
10. The frame defined in claim 1 wherein each column end is cylindrical and the respective blind seat bore is complementary seat thereto.
11. The frame defined in claim 1 wherein the threaded blind bores are of substantially the same diameter and depth.
12. The frame defined in claim 1 wherein the holes are cylindrical and are of substantially the same diameter.
13. The frame defined in claim 1 wherein each bolt has an unthreaded cylindrical shank of smaller diameter than the respective hole and an externally threaded lower end seated in the respective threaded blind bore and of greater diameter than the respective shank.