US3664168A

US3664168A - Horizontal hydraulic press for tubular articles

Info

Publication number: US3664168A
Application number: US10720A
Authority: US
Inventors: Lev Mikhailovich Shtin; Nikolai Feodosovich Grebnev; Ljudmila Sergeevna Satovskaya; Mikhail Grigorievich Rasseikin; Sergei Grigorievich Khirdzhiev; Evgeny Titovich Perevozchikov; Sofia Stepanovna Zagulina; Vladimir Nikolaevich Duda; Mikhail Andreevich Karasev; Ulktor Mikhailovich Rozkov; Valentin Fedorovich Shtamburg
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-02-12
Filing date: 1970-02-12
Publication date: 1972-05-23
Anticipated expiration: 1989-05-23

Abstract

The present invention relates to a horizontal hydraulic press for the manufacture of tubular articles with a cross section variable along its length, mostly drill pipes, which comprises two groups of working cylinders for moving in opposite directions the mandrel which shapes the bore of the pipe; the press is provided with at least two adjustable stops one of which limits the travel of the mandrel with relation to the die in the direction of pressing and the other one - against the direction of pressing.

Description

United States Patent Shtin et a].

[54] HORIZONTAL HYDRAULIC PRESS FOR TUBULAR ARTICLES [72] Inventors: Lev Mikhailovich Shtin, prospekt Ordzhonikidge, 3, kv. 49; Nikolai Feodosovich Grebnev, Kirovgradskaya, 63, kv. 18; Ljudmila Sergeevna Satovskaya, prospekt Ordzhonikidze, 3, kv. 77; Mikhail Grigorievich Rasseikin, ulitsa Lomonosova, l 9, kv. 7; Sergei Grigorievich Khirdzhiev, ulitsa Mashinostroitelei, 51, kv. 38; Evgeny Titovich Perevozchikov, ulitsa Sotsialisticheskaya, 7, kv. 4; Sofia Stepanovna Zagulina, ulitsa 40 ler Oktyabrya, 9, kv. 29; Vladimir Nikolaevich Duda, ulitsa Kultury, 6, kv. l5; Mikhail Andreevich Karasev, ulitsa Kalinina, 66, kv. 9, all of Sverdlovsk; Ulktor Mikhailovich Rozkov, 2 Truzhennikov pereulok, 4, kv. 3; Valentin Fedorovich Shtamburg, Varshavskoe shosse, 135a, korpus 4, kv. 309, both of Moscow, all of U.S.S.R.

[22] Filed: Feb. 12,1970

[2i] Appl.No.: 10,720

[52] U.S. Cl ..72/265 I9 /2 Z! If [451 May 23,1972

, 51 1111.01. "13216 23/20 [58] Field of Search 672/264, 265

[56] p References Cited UNITED STATES PATENTS 3,143,211 8/1964 Krause et al. ..72/265 1,768,866 7/1930 Summey .72/264 1,902,975 3/1933 Sparks ..72/264 2,713,941 7/1955 Schuler... ...72/265 2,672,234 3/1954 13616111 ..72/265 Primary ExaminerCharles W. Lanham Assistant Examiner-Michael J. Keenan Att0rneyWaters, Roditi, Schwartz & Nissen [5 7] ABSTRACT The present invention relates to a horizontal hydraulic press for the manufacture of tubular articles with a cross section variable along its length, mostly drill pipes, which comprises two groups of working cylinders for moving in opposite directions the mandrel which shapes the bore of the pipe; the press is provided with at least two adjustable stops one of which limits the travel of the mandrel with relation to the die in the direction of pressing and the other one against the direction of pressing.

6 Claims, 4 Drawing Figures HORIZONTAL HYDRAULIC PRESS FOR TUBULAR ARTICLES The present invention relates to horizontal hydraulic presses, and more specifically it relates to the presses for the manufacture of tubular articles with a variable cross section along the length, mainly drill pipes.

It is known, that such articles have external and internal bosses so that the process of pressing involves moving the mandrel, which shapes the inside surface of the article and fixing said mandrel rigidly in different working positions with respect to the die.

Known heretofore are the horizontal hydraulic presses adapted for the above described operations, for example described in Hydraulische Pressen und Druckfliissigkeitsanlagen von Ernst Miiller, Springer Ferlag, Berlin (Giittingen) Heidelberg, 1959., pages 11 l-1l3 of the Russian translation, Moscow, 1962.

The mandrel (needle) shaping the internal space of the product in the known presses passes through the ram and is fastened to the end of the rod, which is connected with the working cylinders which move said rod in the direction of pressing, and with the pull-back cylinders pulling the rod with the mandrel to the initial position after pressing.

The working position of the mandrel can be adjusted with relation to the die by means of one adjustable stop in the form of nuts fastened on supporting pillars and limiting the travel of the rod with the mandrel in the direction of pressing when the cross-head moved by the working cylinders bears against said nuts.

in this case the mandrel was fixed comparatively simply and reliably in the required position and the stop took the force acting only in the direction of pressing.

With this design of the mandrel drive, it is practically impossible to fix the mandrel reliably with relation to the die in more than two working positions without stopping the press. These working positions are ensured, in one case, by hearing the rods against their cylinders at the end position during the idle stroke and by theadjustable stop in the other.

When it becomes necessary to perform three and more consecutive motions of the mandrel during pressing (as, for example, is required in the production of drill pipes which, as a rule, have at least one external boss and two internal ones at the ends for the thread) the process of pressing has to be interrupted and the relieved stop must be shifted to a new position. This reduces the press output and impairs the quality of the pressed products. In another known horizontal press (Pat. No. 1,227,858, Federal Republic of Germany) the position of the mandrel is adjusted with relation to the ram by means of an adjustable stop, which limits the movement of the rod with the mandrel against the direction of pressing while the position of the mandrel with relation to the stationary die is controlled by another adjustable stop.

However, in this press the stop likewise provides only one fixed position of the mandrel with relation to the die; in order to obtain the second fixed position of the mandrel one has to relieve this stop, that is to interrupt the pressing process and readjust the stop to a new position.

An object of the invention resides in providing a horizontal hydraulic press with an improved drive of the rod with the mandrel said press allowing continuous pressing of the products when fixing the mandrel in more than two working positions with respect to the die.

Described hereunder is an improved horizontal hydraulic press for the manufacture of tubular articles with a cross section varying along its length, mainly drill pipes, wherein the mandrel shaping the bore of the pipe passes through the ram and is secured to the rod connected to the working cylinders which move it progressively in the direction of pressing said press having not less than two adjustable stops, one of which serves for adjusting the working position of the mandrel with relation to the stationary die of the press and limits the movement of the rod with the mandrel in the direction of pressing. According to the invention, said rod is connected with the auxiliary working cylinders moving it against the direction of pressing while the second adjustable stop limits the travel of the rod with respect to the die against the direction of pressing while the ram is in motion.

The provision of auxiliary working cylinders and of a second stop makes it possible, without stopping theprocess of pressing, to fix the mandrel in more than two working positions by alternative shifting of the stops.

It is desirable that the working cylinders which move the rod during pressing should be fastened in the stationary crosshead, blind ends to each other, and the plungers of each pair of these cylinders should be fastened to the cross-heads, which are, in turn, interconnected by tie rods, the working rod passing through said cross-heads and interacting with them alternately.

Such a design increases the length of the gibs, which take the moment created by the eccentric application of the load of the working cylinders moving the rod with the mandrel, and improves the directional accuracy of the rod movement.

In addition, it becomes possible to locate the adjustable stops between the moving cross-heads, fastened to the working cylinder plungers and the stationary cross-head, carrying said working cylinders.

The invention is also characterized in that each stop is made in the form of a bushing with external thread, freely fitted on the rod and meshing with the nut which is rotated by the drive.

This design contributes to a central application of the load to the stops and eliminates the distortion of the movable frame, formed by the interconnected movable cross-heads which couple the plungers of the working cylinders in pairs.

It is practicable that a removable sleeve be located between the rear stop and the corresponding movable cross-head so as to allow the rod to pass freely through said sleeve. On removing this sleeve the press can be used on a conventional principle, without stops.

In the claimed invention the rod pull-back cylinders are formed by the spaces in the plungers of the working cylinders which move the rod against the direction of pressing and by the plungers accommodated in these spaces and secured to the cross-head, which is connected to the rod. This reduces the travel of the pull-back cylinders by the length of the mandrel working travel and decreases the total length of the press.

Besides, there is a cylinder for the idle travel of the rod in the direction of pressing, said cylinder being formed by the space in the rear end of the rod and by the plunger accommodated in said space.

Now the invention will be described by way of example with reference to the accompanying drawings (in which):

FIGS. 1 and l (a) illustrate the horizontal hydraulic press, side view, partly sectional, according to the invention;

FIGS. 2 and 2 (a) show the same, top view, partly sectional.

As can be seen in FIGS 1 and 2 the claimed press has a front cross-head l carrying a die 2 which adjoins at one side a container 4 installed in a holder 3 and has a calibrated hole 5 which determines the external surface of the product, whose blank (not shown) is held in the container 4. Located at the other side of the container 4 is a ram 6 entering this container, bearing against a packing washer 7 and fastened by an adapter bushing 8 in the cross-head 9, moved in the direction of pressing by the plunger 10 of the main cylinder 1 1 installed in the rear stationary cross-head 12. All the above-listed parts are mounted on a supporting guide frame 13 coaxially to one another.

The pressing force is taken by two parallel frames 14 via the front 1 and rear 12 cross-heads resting on the cross members of said frames.

After pressing, the ram 6 is returned to the initial position by cylinders 15 secured to its cross-head l2. Auxiliary power cylinders 15a may be fastened to the same cross-head 12 in which case force created by said cylinders can be added to that developed by the main cylinder 1 1 and transmitted to the ram 6 via the plungers of the cylinders 15 and the cross-head 9.

The mandrel l6 shaping the internal cavity of the product passes through the packing washer 7 and ram 6 and is fastened to the end of the rod 17, which passes through the bushing 8 of the cross-head 9, the plunger 10 of the main cylinder 11 and the stationary cross-head 18, the plunger 10 being provided with a shank 19, passing through the bottom of said cylinder 11 and sealed in it by a set of cups (constituting a gland).

Fastened by the

blind backs

23 and 24 to each other on the stationary cross-head 18 connected by spindles 22 to the cross-head 12, are two pairs of working

cylinders

25 and 26 one pair of which 25 moves the rod 17 forward in the direction of pressing (forward stroke) while the other pair of cylinders 26 pulls it back (return stroke).

The working cylinders 25 are connected to the rod 17 by the lock 27 consisting of two plates entering a circular groove 28 of the rod 17, said lock being fastened to the cross-head 29 which is secured to the plungers 30 of the cylinders 25 and has a hole for the passage of the rod 17.

The working cylinders 26, in turn, interact with the rod 17 through its shoulder 31 which bears against a cross-head 32, secured to plungers 33 of the cylinders 26 and also having a hole for the passage of the rod 17.

The

cross-heads

29 and 32 are interconnected by tie rods 34 thus making a frame, which is movable with relation to a guide frame 35.

The idle motion of the mandrel 16 against the direction of pressing is ensured by cylinders 36, formed by the spaces 37 in the plungers 33 of the cylinders 26 and by the plungers 38 accommodated in these spaces and secured to the cross-head 39 which is connected to the rod 17.

The idle motion of the rod 17 with the mandrel 16 in the direction of pressing is effected by the cylinder, formed by the space 40 in the rod 17 and by the plunger 41 accommodated in it, said plunger bearing against the cross member 42, which is movable with relation to the frame 43, the cross member 42 being connected by the spindles 44 to the cross-head 32.

Located between the

cross-heads

29 and 18 is the adjustable stop 45 limiting the travel of the rod 17 with the mandrel 16 against the direction of pressing, while the adjustable stop 46 located between the cross-heads l8 and 32 limits the motion of the rod in the direction of pressing. A removable sleeve 47 is located between the stops 46 and cross-head 32, the rod 17 passing freely therethrough.

Each stop is formed by a bushing 48 free-mounted on the rod 17 and having an external thread, meshing with the nut 49 rotated by the drive 50. Said drives are installed on the cross head 18.

The mandrel 16 can be fixed in any working position with relation to the die 2 during pressing alternately by the

stops

45 and 46.

The pressing force, applied to the mandrel 16, is usually directed towards the die 2. In this case when the mandrel 16 is fixed by the stop 46 its force is transmitted to said stop through the

parts

17, 31, 32 and 47.

When the mandrel 16 is fixed in the same position by the stop 45, it is necessary that the force in the working cylinders 26 be higher, than that applied to the mandrel 16 so that the cross-head 29 would be pressed against the stop 45. In this case the force of the mandrel 16 is transmitted to the working cylinders 26 through the

parts

17, 31, 32, 33 and the surplus force built up by the working cylinders 26 in comparison with the force applied to the mandrel 16 is transmitted to the stop 45 through the

parts

33, 32, 34, 29.

It may happen that the direction of the working force applied to the mandrel 16 would be opposite to that just considered. Then, when the mandrel 16 is fixed by the stop 45, the force will be transmitted to this stop through the

parts

17, 27, 29.

When the mandrel 16 is fixed in the same position by the stop 46, it is necessary to build up in the working cylinders 25 a force, exceeding the force applied to the mandrel 16 as a result of which the cross-head 32 will be pressed through the removable sleeve 47 against the stop 46. The force will be transmitted from the mandrel 16 to the working cylinders 25 through the

parts

17, 27, 29, 30 and the surplus force built up by the working cylinders 25 in comparison with the force applied to the mandrel 16 will be transmitted to the stop 46 through the

parts

30, 29, 34, 32, 47.

When it is required to fix the mandrel 16 with relation to the die 2 in more than two positions without stopping the production process, the press operates as follows.

Suppose, that in order to move the mandrel 16 from the first to the second fixed position it is necessary to shift it forward in the direction of pressing. Then the mandrel 16 will be fixed in the first position by the stop 45 irrespective of the direction of the working force and the stop 46 will be shifted to the second position thus creating a clearance between this stop and the sleeve 47; this clearance will be equal to the travel of the mandrel l6 and will be necessary for its movement from the first to the second fixed position. The mandrel 16 is moved by the working cylinders 25 from the first to the second position, that is until the sleeve 47 comes in contact with the stop 46, which produces a clearance between the cross-head 29 and the stop 45.

If for moving the mandrel 16 to the third fixed position it is required to shift it back against the direction of pressing, then the stop 45 relieved at the moment is moved directly to this position after which the working cylinders 26 shift the crosshead 29, connected to the cross-head 32, until it comes in contact with the stop 45,

When for moving the mandrel 16 from the second fixed position to the third one it is required to move it once more forward, the stop 45 relieved at the moment is shifted to the second position of the mandrel 16, that is moved forward to bear against the cross-head 29.

Then the stop 46 is relieved by the working cylinder 26 and the stop 45 is loaded which means that the mandrel 16 is fixed in the same second position, but this time by the stop 45.

Then the relieved stop 45 is moved to the third fixed position of the mandrel 16, creating a clearance between the sleeve 47 and the cross-head 32, this clearance being equal to the travel of the mandrel 16 from the second to the third fixed position. Further, at an appropriate moment the working cylinders 25 move the sleeve 47 until it comes in contact with the cross-head 32, taking up the above-mentioned clearance.

When the mandrel 16 is set to the next fixed positions with relation to the die 2, the sequence of operations is analogous to that followed during setting to the third position.

Similarly, the positions of the mandrel 16 can be fixed successively with relation to the die 2 by moving the mandrel against the direction just considered above.

When the sleeve 47 is removed, the working stroke of the mandrel 16 can be performed in both directions by the working

cylinders

25 and 26 independently of the

stops

45 and 46. In this case the rod 17 carrying the mandrel 16 can be coupled to the plunger 10 of the press main cylinder 11 and the forces of the working cylinders 25 can be added to that of the main cylinder 1 1.

These advantages of the press have been proven during its industrial tests.

We claim:

1. A horizontal hydraulic press for tubular articles each having a cross section variable along its length, such as drill pipes, comprising: a mandrel for shaping the bore of the pipe; a hollow through container accommodating a pipe blank; a hollow ram with said mandrel passing through it, located on one side of said container; power means for effecting progressive travel of said ram; a stationary die located on the other side of said container and having a working opening for shaping the external surface of the article as the blank is being forced out of said container; a rod carrying said mandrel; a plurality of working cylinders connected to said rod and moving it in the direction of pressing; a first adjustable stop having a member interacting therewith for limiting the movement of said rod relative to said die in the direction of pressing; auxiliary working cylinders connected to said rod and adapted to move it against the direction of pressing; a second adjustable stop limiting the movement of said rod relative to said die against the direction of pressing while the ram is in motion; a removable sleeve positioned between the first adjustable stop and the member interacting with said stop; and cylinders for effecting the idle travel of the rod in both directions of movement.

2. A horizontal hydraulic press as claimed in claim 1 said press including at least two movable cross-heads interconnected by tie rods, wherein the working cylinders moving the rod during pressing are rigidly secured with their cylinder bottom ends extending toward each other, said cylinders having plungers extending whereby each pair of the working cylinders are secured by said plungers to the cross-heads and adapted to interact alternately with the rod.

3. A horizontal hydraulic press as claimed in claim 1 including a drive for said adjustable stop, each adjustable stop being made as a bushing slidably mounted on the rod and having an external thread meshing with a nut which is connected to the drive.

4. A horizontal hydraulic press as claimed in claim 2 wherein the adjustable stops are located between the movable cross-heads secured to the plungers of the working cylinders and a stationary cross-head carrying these working cylinders.

5. A horizontal hydraulic press as claimed in claim 4 said removable sleeve being between the rear adjustable stop and the movable cross-head through which the rod passes.

6. A horizontal hydraulic press as claimed in claim I wherein the cylinders for the idle travel of the rod are formed by the spaces in the plungers of the working cylinders moving the rod against the direction of pressing and by the plungers accommodated in these spaces and secured to a cross-head connected to the rod and wherein there is a cylinder for the idle travel of the rod in the direction of pressing this cylinder being formed by a space in the rear end of the rod and by the plunger accommodated in said space.

Claims

6. A horizontal hydraulic press as claimed in claim 1 wherein the cylinders for the idle travel of the rod are formed by the spaces in the plungers of the working cylinders moving the rod against the direction of pressing and by the plungers accommodated in these spaces and secured to a cross-head connected to the rod and wherein there is a cylinder for the idle travel of the rod in the direction of pressing this cylinder being formed by a space in the rear end of the rod and by the plunger accommodated in said space.