US2743811A

US2743811A - Loading device for hot extrusion presses

Info

Publication number: US2743811A
Application number: US337833A
Authority: US
Inventors: Delcroix Jean
Original assignee: COMPTOIR IND ETIRAGE
Current assignee: COMPTOIR IND ETIRAGE; COMPTOIR INDUSTRIEL D'ETIRAGE ET PROFILAGE DE METAUX
Priority date: 1952-03-20
Filing date: 1953-02-19
Publication date: 1956-05-01
Anticipated expiration: 1973-05-01

Description

May 1, 1956 J. DELCROIX LOADING DEVICE FOR HOT EXTRUSION PRESSES 4 Sheets-Sheet 1 Filed Feb. 1.9, 1953 May 1, 1956 J. DELCROIX LOADING DEVICE FOR HOT EXTRUSION PRESSES Filed Feb. 1.9, 1953 4 Sheets-Sheet 2 May 1, 1956 J. DELCROIX LOADING DEVICE FOR HOT EXTRUSION PRESSES 1.9, less 4 Sheets-Sheet 3 Filed Feb.

May 1, 1956 J DELCROIX LOADING DEVICE FOR HOT EXTRUSION ERESSES Filed Feb. 19, 1953 4 Sheets-Sheet 4 United tes Pa ent r 2,743,811 LOADING DEVICE FOR HOT EXTRUSION PRESSES Jean Delcroix, LIsle Adam, France, assignor to Comptoir Industricl dEtirage et Profilage de Metaux, Paris, France, a corporation of France 1 Application February 19, 1953, Serial No. 337,833 Claims priority, application France March 20, 1952 2 Claims. (Cl. 207-2) The present invention relates to the hot extrusion. of metals, by extrusion of a metal ingot through a die by means of an extrusion press, and more particularly to the loading of the previously heated ingot into said press.

This loading is most often operated either by means of a hand tool, such as a more or less complex clutch, or by means of a mechanical or hydraulic device which places the ingot coaxially with the container of the press, the introduction of the ingot into the container being then accomplished by means of the pressing ram plunger which thereafter forces the ingot through the die, or by means of an auxiliary device such as a jack.

But the above described devices do not always meet the requirements of certain techniques. This is more particularly the case when extruding metals with high melting points, ferrous metals for instance. The extrusion is then made much easier by wrapping the ingot to be extruded in a sheet of lubricant, consisting, for instance, of a sheet of glass fibres. This wrapping should be made immediately before the introduction of the ingot into the container. The homogeneity of distribution of the lubricant is thus preserved and melting and flowing of the lubricant along the ingot, as well as accumulation of said lubricant in the lower portions thereof are avoided. This is particularly important when extruding hollow products, when the good distribution of the lubricant is one of the determining factors for centering the bore in such products.

One is thus led to provide a table on which the ingot rolls or tumbles during its transportation between the furnace and press. The arrangement of presses, however, does not generally leave enough room for housing a permanently secured table of this type between the container and the ram.

One object of the present invention is to provide a device by means of which the ingot may be loaded in the press under the best conditions, without interfering with the movement of the ram of the press.

Another object of the invention is to provide a device by means of which the ingot may be easily wrapped in a sheet of lubricating material, immediately before it is loaded in the press.

Still another object is to provide a table of this type which automatically tilts in order to leave a free passage for the ram of the press and comes back to its original position when the carriage which supports the tilting table is withdrawn from the press.

This device comprises a carriage adapted to be moved substantially perpendicularly to the longitudinal axis of the press, and to be engaged immediately behind the container while leaving a free passage for the ram of the press, a table pivoted on said carriage about an axis perpendicular to said movement, the width of said table in the direction of the movement of the carriage, being at least equal to the peripheral development of the ingot and being provided, on its free edge which is extending towards the longitudinal axis of the press, with means for retainingan ingot along said edge, means being also provided for tem- 2,743,811 Patented May 1, 1956 porarily immobilizing the table with respect to the frame, with the free edge of said table substantially at the level of the lower generatrix of the bore of the container, and for releasing this table while allowing it to tip over in such a manner that the means for retaining the ingot falls below the level of the lowermost generatrix of the bore of the container.

it is thus possible to Wrap up the ingot in a sheet of lubricant, glass fibres for instance, previously arranged on the fiat surface of the table by rolling the ingot along the table into the gutter or other receiving means on the table, to place the wrapped ingot supported in the gutter in front of the opening of the bore in the container, to load the ingot into the container by pushing it in by means of the ram plunger, then to lower the table and to withdraw the carriage and table laterally from the press without being hindered by the plunger and ram.

The ingot retaining means on the free edge of the table may consist of a gutter, parallel with the axis of the press. The table, which may be made of one or more panels is preferably so arranged as to provide, in its position of immobilization, a slight slope towards said gutter.

The means for temporarily immobilizing the table with respect to the carriage may consist of one or more hooks, pivoted on the carriage, and cooperating with heels provided on the table, said hooks being advantageously provided with a tail portion which may be acted upon by the bevelled end of a cam member rigidly connected to the ram, which makes it possible to unhook the table automatically at the required time during the forward motion of the ram.

The carriage which supports the table may be either suspended from substantially horizontal slides located above the press and extending perpendicularly to the axis thereof or may rest on a slide arranged under the press with the same orientation, rolling members being provided in both cases.

Means, such as one or more fixed ramps are advantageously provided for bringing the table back to its initial position, when the carriage is moved away from the axis of the press.

A preferred embodiment of a device according to the invention is described hereinafter with reference to the vention, before the loading of the ingot.

Fig. 2 is a sectional view through line ll--II of Fig. 1, the ingot being in position on the loading table.

Fig. 3 is a view similar to that of Fig. 2; the loading device being shown in the position it occupies at the time the ingot is introduced into the container.

Fig. 4 is a similar view, with the loading device in the position it occupies after the ingot has been introduced into the container. 1

Referring now to the drawings, the press comprises a. frame having four horizontal columns 1, the two lower columns carrying bed-slides 2 which support the container 3 of the press and on which is guided the ram 4 which carries the plunger 5 for forcing the ingot to be extruded through the die, which is arranged at the end 6 of the container and not shown.

Under the upper columns 1 are secured, by means of straps 7, two rails 8, extending perpendicularly to the axis of the press and in which roll four double rollers 9 from which is suspended, by means of yokes 10, a carriage 11 having the shape of an inverted U. Between the vertical wings of the carriage 11 is arranged an axle 12 on which are pivoted two half tables 1.3, one end of which comprises a heel 14 cooperating with a hook 15 pivoted on an axle 16 carried by carriage 11, each of the hooks 15 being provided with a tail piece 17. At their other ends the ingot 23 into the bore 20 of the container.

and on their upper faces, the half tables 13 comprise a when the hooks 15 are engaged with said heels, the upper faces of the half tables are in one and the same plane, slightly sloping towards the middle vertical plane of the press, the bottom of gutter 18 being substantially at the level of the lower generatrix of the plunger 5 and, consequently, of thatof the bore 26 in container 3, which is to receive the ingot.

The movable ram 4 carries, outside the right hand slide-bed, a control rod 21 having a bevelled end, which protrudes from the front ofthe movable ram and extends parallel with plunger 5. The length and position of rod 21 are such that when carriage 11 has been moved on the rails 8 to bring the gutter 1.8 coaxially with the bore 20 in container 3, said rod, on movement of the ram and plunger toward the container, successively lifts the tail pieces 17 of the hooks l5, releasing said hooks from the heels 14 of the half tables 13, the heel of the half table which is adjacent the container 3 being released when the plunger 5 is about to enter the bore 2t) of the container 3. One of the above mentioned bed slidcs2 carries, be-

neath the tables 13, two inclined ramps 22, the upper ends of which are at such a level that when the lower face of the edge of the half tables 13 which comprises the gutter 18 rests on that end, the heels 14 are in the position for engaging the hooks 15.

The device operates as follows:

The carriage 11 being brought outside the press in the position represented in Fig. 2 and the heels 14 of the half tables .13 being engaged with the hooks 15, the ingot. 23 to be extruded is placed on the upper portion of these half tables which have been previously covered with a sheet of lubricant, say glass-fibres, after which said ingot is caused to roll on the half tables while being progressively wrapped in the sheet of glass fibre which adheres to the ingot and, the ingot then falls into the gutter 18, the slope of the half tables making this operation easy. The carriage 11 is then pushed towards the axis of the press until it reaches the position shown in Fig. 3. The ingot 23 then is in line with the bore 29 in the container and plunger 5. When the movable ram 4 is moved toward the container 3 by the press mechanism, not shown, the plunger 5 forces During this movement, the bevelled end of the control rod 21 acts successively upon the tail pieces 17. of the two hooks 15, disengaging said hooks from the heels 14 of the half tables 13. Said half tables .13 are released and tip over to the position shown in Fig. 4 in which they rest upon ramps 22. The tipping of eachhalf table takes place however only after ingot 23 pushed by the plunger 5 has practically left the corresponding half table. Due to this tipping, the half tables move downwards, making it possible to withdraw the carriage 11 from the press without plunger 5, previously engaged in gutter 18 hindering thiswith drawal. During this withdrawal of carriage 11, the half tables 13 are gradually raised by ramps 22 until they assume their initial positions, in which the heels 14 again engage the hooks 15 which have moved back to their vertical positions under the action of the weight of their tail-pieces 17, the device then being ready for a new loading operation without the necessity of having to wait for the end of the extrusion operation of the ingot previously introduced in the container.

I claim:

1 Ina horizontal extrusion press including a container having an axial bore located on the longitudinal axis of the press, a die closing one end of the bore, a ram movable toward and away from the container, a plunger fixed to the ram and located on the longitudinal axis of the press and adapted to enter the bore of the container, a device for loading ingots into said container comprising a carriage adapted to be moved transversely of the press to a position between said container and plunger and in line with said plunger and bore, a table pivotally mounted on said carriageon an axis extending parallel to the longitudinal axis of the press, said table having a flat supporting surface for supporting a sheet of glass-like lubricant placed thereon and a gutter located adjacent the edge of the table facing the press, said gutter extending parallel to the longitudinal axis of the press and adapted to hold an ingot, the width of said table in thedirection of movement of said carriage being at least equal to the peripheral length of the ingot, a latching member on said table, a latch pivoted on said carriage and adapted to engage said latching member, and cam means rigidly connected to said ram and adapted to contact said latch and disengage it from said latching member after said carriage has been moved to bring said gutter in line with the bore of the container and said rarn has been moved toward said container so that said plunger is received in said gutter, whereby said table automatically tilts to drop said gutter below the level of the bore in said container while said carriage remains stationary.

2. A press according to claim 1, comprising a ramp for guiding the movement of said gutter when said carriage is withdrawn from the press to its loading position, the upper end of said ramp being located at such a level that when the carriage is in its loading position the latch member on said table is in position to engage the latch on said carriage.

References Cited in the file of this patent UNITED STATES PATENTS 1,049,641 Astfalck Jan. 7, 1913 2,429,525 Rawlinson et a1 Oct. 21, 1947 FOREIGN PATENTS 250,944 Great Britain June 10, 1926 589,328 Germany Dec. 6, 1933 620,244 Germany Oct. 19, 1935 684,794 Germany Dec. 5, 1939