Device for bending thin-walled pipes

• US 4,007,622 A
• Filed: 05/01/1975
• Issued: 02/15/1977
• Est. Priority Date: 05/01/1975
• Status: Expired due to Term

• Current Assignee: Abram Isaevich Galperin, Boris Borisovich Vasiliev, Boris Vladimirovich Pokrovsky, Igor Nikolaevich Kotikov, Lev Vladimirovich Vishnyakov, Vladimir Ioganovich Kalganov
• Original Assignee: Abram Isaevich Galperin, Boris Borisovich Vasiliev, Boris Vladimirovich Pokrovsky, Igor Nikolaevich Kotikov, Lev Vladimirovich Vishnyakov, Vladimir Ioganovich Kalganov
• Inventors: Kalganov, Vladimir Ioganovich, Vishnyakov, Lev Vladimirovich, Galperin, Abram Isaevich, Pokrovsky, Boris Vladimirovich, Kotikov, Igor Nikolaevich, Vasiliev, Boris Borisovich
• Primary Examiner(s): Larson, Lowell A.
• Application Number:
  US05/573,514
• Time in Patent Office: 656 Days
• Field of Search: 72/369, 72/370, 72/392, 72/393, 72/306, 72/307
• US Class Current: 72/393
• CPC Class Codes: B21D 9/14 Wrinkle-bending, i.e. bending by corrugating

Abstract

Device for bending thin-walled pipes from inside by embossing them with eccentric corrugations, comprising an expander block introducible into the pipe to the point of bend, the block being formed by a supporting shoe and a punch whose side facing the pipe has a toroidal surface following the shape of the desired corrugation and which is mounted on the shoe with a provision for positive movement in a radial direction to the pipe surface for making the corrugation on the pipe. In the cross-sectional plane of the pipe the punch has the shape of a ring which is open at the side of the shoe and is composed of individual elements around its parameter, each element being articulated to a movable member of one of the power cylinders whose axes are arranged radially to a cross-sectional plane of the pipe while their stationary members are connected with the supporting shoe. The stroke of the movable elements of the power cylinders is practically equal to the height of the corrugation on the corresponding generatrix of the pipe.

Claims

1. A device for bending thin-walled pipes by embossing them with eccentric corrugations (C), comprising:

an expander block (2) introducible into a pipe (1) to be bent, to the point of the desired bend, and being formed by a supporting shoe (3) and a punch (4), the latter being installed on the former, with provision for positive motion relative to said block in the course of the bending radially to the pipe surface, for making the desired corrugation on the pipe, the corrugation being eccentric to the pipe axis, and for thus bending the pipe;

said punch having the shape of a ring in a cross-sectional plane of the pipe, being open at the side of said shoe and composed of individual punch elements (7) around the circumference of said punch;

power cylinders (10) whose axis are arranged radially to a cross-sectional plane of the pipe, having movable members (9) that are respectively articulated to said punch elements while having stationary members (10) connected with said shoe;

said movable members making strokes that are substantially equal to the height (h) of the desired corrugation on the corresponding generatrix of the pipe.

2. The device as defined in claim 1, wherein said stationary members (10) and said shoe (3) are mounted on a hub (11) coaxial with the pipe (1), with the aid of eccentric shafts (12) arranged around said hub parallel to the pipe axis, the ends of said shafts at one side of said hub being kinematically linked with one another and with an independent drive (13) for their joint turning, which ensures a radial setting of said punch elements 7 and said shoe.

3. The device as defined in claim 2, wherein said shoe (3) and said stationary members (10) of a power cylinder (10) diametrically to said shoe are interconnected at both ends of said hub (11) by two parallel side plates (14, 15), one (14) of which mounts an independent drive (16) of said eccentric shafts (12), while said punch elements are consecutively articulated with one another by resilient braces (25).

4. The device as defined in claim 3, wherein said hub (11) is freely mounted on a hub shaft (23) passing through holes in said side plates (14, 15), and is connected with the latter by a spline, while said ends of the eccentric shafts (12) are installed on self-propelled trolleys (5, 6), one (6) of which carries a mechanism (29) for turning said hub shaft around its axis together with said block (2) relative to said trolleys.

5. The device as defined in claim 4, wherein said turning mechanism (29) is constituted by a worm pair whose worm wheel (30) is fastened on one end of said hub shaft (23) and whose worm (31) is connected by a ratchet (33) with a turning lever (32).