摘要:
The invention relates to a method for shaping a workpiece having a drum-type peripheral wall, on the inner face of which an inner profile featuring longitudinal ribs is formed by feeding at least one profiling roll to said inner face. According to the invention, at least one rotatably mounted profiling roll is fed to an inner face of the peripheral wall of the workpiece, and said at least one profiling roll rotates relative to the inner face of the peripheral wall such that the inner profile is formed in the inner face in a non-cutting manner.
摘要:
The invention relates to a machine, in particular a machine tool (9) for deep rolling wheelset shafts (5) for rail vehicle wheelsets with a headstock (12) and a tailstock (13) which each have prick punch points (16) for holding a wheelset shaft (5) at its respective ends, a device (16, 18, 20, 21 and 22) for driving the wheelset shaft (5), as well as tools which can be moved in directions (z, x) on the machine tool (9) for deep rolling lengthwise sections (axle zones 1 to 4) of the wheelset shaft (5), and clamping and feed devices. The tools consist of several pairs of work rollers (14, 15, 23, 25, 24, 26), of which each pair is intended for deep rolling at least one axle zone (1, 2, 3, 4) of the wheelset shaft (5).
摘要:
A method is for producing a circular cylindrical body (10) comprising a workable mass, having at least one helical internal cavity extending in the interior of the body. The body (10) is initially produced with a straight internal recess, for example by means of extrusion. Afterwards the body is cut to a defined length. The body (10) that has been cut to length is then subjected to a rolling process by means of a friction surface arrangement (23) while being supported over the entire length thereof on a support means (16). The rolling process takes place in multiple steps, wherein a rolling movement using a first axis of rotation (25) is performed in a first step, and a rolling movement using a second axis of rotation (26) that is different from the first axis of rotation is used in a second step. There is also an apparatus for performing the method.
摘要:
A heat exchanger tube with a tube axis and with a tube wall having a tube outside and a tube inside, axially parallel or helically encircling inner ribs, with a groove which lies in each case between adjacent inner ribs, being formed from the tube wall on the tube inside, the helix angle, measured with respect to the tube axis, of the inner ribs being smaller than or equal to 45°, the region of the inner ribs which is remote from the tube wall being deformed at regular intervals asymmetrically on one side essentially in the tube circumferential direction, the deformed material of the inner ribs forming protrusions above the groove, the protrusions extending in each case over a finite deformation zone along an inner rib, the markedness of the deformation changing continuously within the deformation zone.
摘要:
In an impact rolling apparatus the axes of roller heads are arranged substantially perpendicularly relative to the longitudinal axis of the workpiece. Accordingly, a displacing of the material at the workpiece proceeds predominantly tangentially perpendicularly to the longitudinal axis of the workpiece, caused by the impact effect of the impact rollers mounted at the roller heads. By this arrangement of the roller heads impact rolling operations can be performed close to a shoulder of the workpiece and marked steps thus maintaining the advantages over the known impact rolling method at which the displacement of the material proceeds predominantly in the direction of the longitudinal axis of the workpiece.
摘要:
An apparatus and method are provided for roll sizing the periphery of cylindrical workpieces to finish and size the workpiece to a close tolerance diameter. The method and apparatus can also be used to prefinish and presize cylindrical workpieces in preparation for subsequent forming of spline teeth or gear teeth and the like on the workpiece periphery.
摘要:
A process for fabricating a cross rolling die is disclosed. A flat wooden cross roll tooling model blank cut to the specified die dimensions is milled by a conventional milling machine to produce a pre-form blank in accordance with the desired cross roll die surface. A face cast of the thus contoured wooden model blank, or a negative impression, is then made which, in turn, is used to make a positive cast of the wooden model blank. A series of closely spaced cuts parallel to the axis of roll is then made in the wooden model blank and the positive cast of sufficient depth to provide radial flexibility in each of these pieces. The model blank is then divided into segments for separate mounting on the cross roll die mounting plates, with each segment mounted separately so as to cover approximately 315.degree. of the full 360.degree. displacement of the cross rolling machine. The transverse cuts in the wooden model blank and positive cast are then filled with a hard-setting filler material and the surfaces of the model blank and positive cast are then contoured by grinding down. A sand cast is then made of each segment from which corresponding face casts are made. Abrader die casts are then in turn made of each face cast. A graphite electrode is then abraded on each abrader die and a cross roll die blank is then formed by means of electrical discharge machining (EDM) from which the cross roll die may be formed.
摘要:
Electric resistance heating means is embedded in a forging tool so that the temperature thereof may be maintained at a desired forging temperature. Therefore the present invention makes it possible to forge light metal alloy workpieces such as aluminum workpieces which have been hitherto considered to be difficult to be forged by rotary forging machines. In addition, better quality of forgings as well as considerable improvement of productivity may be ensured. Thus, reduction of labor and material in a forging process can be attained.
摘要:
A bar stop for a forming machine is pneumatically telescopically extendable towards the end of the bar being fed to the machne. When extended, a cam on the forming rollers of the machine causes a pressure fluid operable piston and cylinder device to index a plate angularly with respect to a ring so that telescopic retraction is restricted under the action of the forward feed of the bar. Further rotation of the forming rollers causes the plate to be indexed into a position allowing relative movement of plate and ring so that telescopic retraction is allowed during the action forming operation which next takes place.
摘要:
A method of shaping a plastically deformable sleeve by rolling jaws, having an internal shaping surface, on the sleeve after a shaping core has been placed in the bore of the sleeve. As a result of the rolling operation, the outer diameter of the material is reduced and the inner surface of the sleeve assumes the external shape of the core. The method enables simultaneous shaping of the outer and inner surface of the sleeve such as an outer toothing and a splined bore. In a particular embodiment in which internal threads are to be formed on the sleeve, an unrevolving core is used which is elastically biassed against axial displacement so that when the sleeve is rotated by the jaws in the course of shaping the core will be axially displaced against the elastic biassing action and the core will automatically advance over an axial feed distance when the jaws release the sleeve.