DE1301224B - Hydraulic post-forming device for automatic full contour machining on post-forming machine tools, especially post-forming milling machines - Google Patents

Description

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The invention relates to a hydraulic system. In particular, the invention can be characterized Post-shaping device for automatic full contouring through the design of the quadrant valve as Machining on post-forming machine tools, ins- rotary valve, consisting of a housing with cylindrical special Post-form milling machines, with an alldrische bore into which the reversing valve laterally deflectable pushbutton and with two pressure at right angles to each other and from the interrupter valve, double-acting front center lines leading to the feed drives, one of which by one of the inlets and outlets as well as one preferably Push-button controllable reversing valve with increasing pressure-free return push-button deflection leading to a collecting container open continuously from a high-end line, and from one in the housing value in one direction above zero up to an io rotatable valve body with the supply and discharge lines Maximum value is controllable in the opposite direction and different entder in at least four valve positions others by a cyclical exchange with the bar interrupter valve with rising button pressure medium supply lines and the pressure-free return deflection channels connecting continuously in the same direction, from zero to a maximum value and back again can be controlled back to zero. be provided that the switching device In a known device for the full is formed by at least two pairs of contacts, Outline copying are two reversing valves with valve through which the switching of the quadrant piston provided, each one feed valve in one or the other adjacent actuator assigned. The control of this environment is electromagnetic or electromotive reversing valves takes place by means of an eccentric that acts.

in turn, from a hydraulic motor to the process. According to the invention, means can be provided Position of the two reversing valves is driven. be, with the help of which the valve body in the valve-Das Push button valve controls this hydraulic motor, which locks in position and prevents it from rotating automatically With the help of mechanical links the two will hold 25 without the electromagnetic or Reversing valves operated with the valve piston. An electromotive switchover of the quadrant of this type of control does not work without delay, the valve is prevented.

which greatly affects the postforming accuracy.

is pregnant. finding from a rotatable with the valve body

Half outline copying is also known, with 30 Maltese crosses and one radial under spring load

the help of which a full outline copying may exist in this intervening role,

can be made borrowed that the first half-outline in the drawing are exemplary embodiments of the

represented by a second half-outline to the full outline of the subject of the invention. It shows

is complemented. However, this cannot be done entirely by itself. 1 a schematic representation of a hydraulic

actively carry out. If a post-forming device from the model 35 comes to automatic full

deflected stylus at the end of a half-outline in outline processing,

his zero position, in which he is no longer from the Fig. 1 a is a representation of the position of the Model is deflected, so as to touch the end of the touchscreen corresponding to the quadrant valve according to FIG. 1 at this point Direction of movement from a zero area with a schematic indication of the exhibition to be able to follow from, the button 40 has steering the button opposite to an only axially verbei the now starting reversal of the sliding control part,

both feed drives not the ones for a further F i g. 1 b shows a section through the drive tooth movement on the full outline model of the required maxi-wheels of the quadrant valve after the line I bl b malauslenken, which would result in the probe moving away from the FIG. 1 model. 45 Fig. 1 c is a plan view of the quadrant valve

The object of the invention is to solve this problem according to FIG. 1 with a locking device;

to eliminate the issues and take the required action F i g. 2, 3 and 4 show partial representations of the

to meet, through which automatically the double schemes according to F i g. 1 with other positions of the

acting feed drives a cyclic control quadrant valve,

experience exchange. 50 Fig. 2 a, 3 a and 4 a representations of the tactile

The inventive solution is characterized by areas similar to that according to FIG.

one upstream of the feed drives, which speaks the positions of the quadrant valve

Feed and discharge lines are cyclically interchanged according to FIGS. 2, 3 and 4,

Four position quadrant valve represented by FIG. 2 b, 3 b and 4 b Sections through the drive one of the switch controllable switching device 55 gears of the quadrant valve according to the lines when falling below or exceeding the two equal llb-llb, III & -III & and IVb-IVb of FIGS. 2, 3 large Valve openings of the reverse and lower and 4.

Breaker valve causing button deflection The button 8, not shown in detail, is

is switchable in one or the other direction. With constructed and arranged in such a way that it can be

With the help of the quadrant valve it is achieved that the 60 aligns to execute spatial parallel movements

Assignment of the reversing valve and the interrupter capability. The upper face of the probe shaft 2 is

valve to the two double-acting feed provided with a conical depression 9, the one

drives is automatically interchanged cyclically, with ball 10 taking up about half of it. Against

the switchover of the quadrant valve to one the other half of the ball 10 is supported equally-

Time takes place at which the button is still directed from the 65 to the button shaft 2 with a conical

Model is deflected and as a result of this deflection depression 11 a shaft-shaped control part 12 from,

after switching itself into the new one which is made of one piece with the control slide 19

Equilibrium controls. consists. The slide 19 is part of the

reversing valve 15 and partly to the interrupter valve level in the lower part of the valve body in pairs on-16. The control slide 19 is opposite with annular grooves and the second, 64 b, 64 d, see through which the degree of connection between 64 /, 64 h, in a perpendicular to the first axial plane, see radially into the valve housing 17 a, 17 b standing second axial plane in the same axial opening, to the hydraulic fluid source and the 5 height position and also in pairs opposite one another step.

27 is controlled. The pressure fluid is sucked in through the outlet points of the channels of the valve body a pump 28 via a filter 29 from a pressure 62 corresponding in their axial position to the free collecting tank 30 and the valves io openings of the connection lines 58 a, 58 b, 59 a,

15 and 16 via the feed lines 22 and 25 to 59 b into the housing 60, so that in a first rotationally guided position of the valve body 62 in the housing 60 (FIG. 1)

The reversing valve 15 and the interrupter valve and in a third position offset by 180 °

16 are as follows in the hydraulic system of the work (Fig. 3) of the longitudinal cylinder 39 with the interrupt generating machine switched on: In the middle position of the valve 16 and the transverse cylinder 36 with the reversing control slide 19 cover the reversing valve 15, the valve 15 are connected, while in a 90 ° on both sides of the two annular grooves in the control slide relative to the first position offset the second 19 located control collar all openings of the (F i g. 2) and one by 270 ° in turn opposite in the valve housing opening pipelines of the first position offset fourth position

20, 21, 22, 23, 24 against each other. As a result, the longitudinal cylinder 20 (FIG. 4) and the transverse cylinder are closed with respect to the reversing valve 15. If the control of its connection with the valves 15 and 16 is moved downwards with the slide 19, the feed lines will be interchanged. Furthermore, 22 differs increasingly over the annular groove with which the first from the third and the second from the control line 21 and the second control line 23 in the fourth rotational position of the valve body 62 to the same extent over the second annular groove with the housing 60 in that the working chambers 35 α and pressure-free return line 24 connected. If the 35 b or the working chambers 39 α and 39 b is moved upwards in the control slide 19, the reverse is done with the feed line 22 from the reversing valve 15 to an increasing extent via the control lines 21 and 23 or from the annular groove the control line 23 and the control interrupter valve 16 outgoing control line 27 line 21 via the annular groove with the pressure-free 30 and the return line 37 are connected. Thereby return line 20 connected. Both pressure-free return is achieved that with every quarter turn of the lines 20,24 lead to the collecting container 30. Valve body 62 between the working chambers 35 a,

A cyclical exchange between the reversing valve 15 and 39 a, 35 ft and 39 b

Interrupter valve 16 outgoing control lines takes place. This means that every position of the valve

21, 21 b, 23, 23 b, 27 and the pressure-free return line 35 body 62 a 180 ° area for the scanning of the 37 on the one hand and to the working chambers 35 a, model or the processing of the workpiece to-35 b of the transverse cylinder 35 and to the working order, which is offset by 90 ° with respect to the 180 ° area belonging to the position leading to the next rotary chambers 39 a, 39 b of the longitudinal cylinder 39, connecting lines 58 a, 58 b, 59 α and 59 b others the transverse cylinder 35 and the quadrant valve 57 is switched on alternately. 40 of the longitudinal cylinder 39 through the reversing valve 15 in

The quadrant valve 57 consists essentially of two directions and the interrupter valve 16 is controllable in one direction from a housing 60 with a cylindrical one.
Bore 61, in which a cylindrical valve- Because with this embodiment, two bodies 62 are always fitted in a sealing manner in the bore 61, rotatably adjacent 180 ° areas, each with a half of 90 °. In the upper part of the bore 61 45 cover, it is sufficient to open the scanning area for each valve body position at a distance from one another in the axial direction at 90 °, corresponding to the three control lines 21 b, 23 b and 27 and the angle α in FIGS. 1 a, 2 a, 3 a and 4 a to unpressurized return line 37 a. In a similar way, that is, the four connecting lines 58 a, 58 b, 59 a of the control slide 19 end between a lower 59 b in the lower part of the bore 61, namely in a paired position in which the reversing valve 15 and the instruction at the same height, but at the diametrically opposed breaker valve 16 are equally open (quarter-opposite points, deflection of the button), and an upper position,

The valve body 62 is open in its upper part at which the reversing valve 15 and the circumference are equally wide open with four spaced-apart interrupter valves 16, the arranged annular grooves 63 α, 63 b, 63 c, 63 d , 55 reversing valve 15 but an opposite front axial position counteracts the confluences of the control thrust of the piston in the closed cylinder lines 21 b, 23 b, 27 and the return line 37 (three-quarter deflection of the button). This will speak, so that in the assembled state each expediently by a from the control part 12 or from an annular groove with a control line or the control slide 19 moved contactor 65 he return line regardless of the rotational position of the 60 ranges, which together with the control slide 19 between -Valve body 62 opposite the housing 60 in see two fixed contacts 66 α, 66 b is slidably permanent connection. The valve body 62 is and when it falls below the quarter deflection of the inside with 8 from FIGS. 1, 2, 3 and 4 button 8 together with the contact 66a the visible, separate channels 64 a, circuit of a motor 67 for the run in a 64 b , 64 c, 64 d, 64 e, 64 /, 64 g and 64 h provided, 65 direction of rotation and when the three-quarters of which are exceeded two of one of the annular grooves 63 a, deflection of the button 8 together with the con- 63 b, 63 c, 63 d and from each of which the clock 66 b closes a second circuit of the motor 67 for the first, 64 a, 64 c, 64 e, 64 g, in a first axial run in the reverse direction of rotation .

The motor 67 carries a pinion 68 on its shaft which meshes with a gear 69 which is freely rotatable on a wave-shaped extension of the valve body 62. The gear wheel 69 contains an elongated hole 70 which extends in the circumferential direction at an angle of approximately 90 ° and into which a pin 71 which is embedded eccentrically in the end face of the valve body 62 engages. The valve body 62 carries at the opposite end one from FIG. 1 c visible four-armed Maltese cross 72, in which a roller 73 which is movable essentially radially with respect to the Maltese cross engages and is held in the engaged position by a spring 74. This creates four positions offset by 90 ° from one another for the valve body 62, in which the channels 64 α, 64 b, 64 c, 64 d, 64 e, 64 /, 64 g, 64 h with the connecting lines 58 a, 58 b , 59 a, 59 b are each connected differently.

If the motor 67 starts up by touching the contactor 65 with one of the stationary contacts 66 a, 66 b in a corresponding direction of rotation ao, it first rotates the gear 69 via the pinion 68 until the pin 71 rests against one end of the elongated hole 70. With the further rotation of the gear 69, the pin is carried along and thereby also rotates the valve body 62 together with the Maltese cross 72. The roller 73 moves out of its position of engagement with the Maltese cross 72 against the action of the spring 74 until the highest point is reached a cross arm, whereupon the direction of the torque exerted by the spring 74 via the roller 73 on the Maltese cross 72 is reversed and the Maltese cross together with the valve body 62 jerks into the next latching position under the action of the spring 74 due to the presence of the elongated hole 70 of the Maltese cross 72 is moved. Since the new position of the quadrant valve 57 corresponds to a different position of the valves 15 and 16 to achieve the resulting direction of advance of the pushbutton that triggers the switchover, the contactor 65 is immediately moved away from the fixed contact 66 α or 66 b , and the motor 67 stands still, a delay in the opening of the contact or an overrun of the motor due to the effect of the elongated hole 70 is insignificant.

The introduction of the quadrant valve 57 allows any shape of a model to be created using the outline method scan and transfer to the workpiece machined by the machine tool.

By moving the taps 31 and 32 to connect the control lines 21 and 23 to the connection lines 21a and 23a, the device can be set to "line milling". Is to also uncouple the contactor 65 by suitable means from the control slide 19 in order for the line milling to prevent unwanted switching of the quadrant valve 67 and the Line milling to allow the necessary 180 ° area for scanning the model. To be the changeover cocks 31 and 32 are expediently connected to a corresponding coupling device, by means of which the decoupling of the contactor 65 inevitably takes place when the taps are switched. By appropriate setting of the quadrant valve 57 before the start of machining, the Define the horizontal feed in each of the four main directions. Furthermore, by switching over twice of the quadrant valve 57 in quick succession at one end a direction reversal of the Horizontal feed with simultaneous line provision, triggered by the first, which only lasted for a short time Switching position, can be achieved.

Claims (5)

Patent claims: 1. Hydraulic post-forming device for automatic full contour processing on post-forming machine tools, in particular post-forming milling machines, with an all-round deflectable button and with two double-acting feed drives running at right angles to each other, one of which is continuously from a maximum value in one direction with increasing button deflection by a reversing valve that can be influenced by the button can be controlled via zero up to a maximum value in the opposite direction and the other is continuously controllable in a constant direction from zero to a maximum value and back to zero by an interrupter valve that can also be influenced by the button with increasing button deflection, characterized by the feed drives (35, 39) upstream, the feed and discharge lines (58 a, 58 b, 59 a, 59 b) cyclically interchanging square valve (57) with four positions, which can be influenced by a switching device (65, 66 a, 66 b ) at U nter or Exceeding the two equally large valve openings of the reversing valve (15) and the interrupter valve (16) causing button deflection can be switched in one or the other direction. 2. Device according to claim 1, characterized by the design of the quadrant valve (57) as a rotary valve, consisting of a housing (60) with a cylindrical bore (61), into which the pressure medium lines ( 21, 23, 27) α to the feed drives (35, 35 b, 59 a, 59 b) leading supply and discharge lines (58 α, 58 b, 59 a, 59 b) and a preferably to a collection container (30 ) leading pressure-free return line (37) open out, and from a valve body (62) rotatable in the housing (60) with the supply and discharge lines (58 a, 58 b, 59 a, 59 b) in at least four valve positions different according to the cyclic Exchange with the pressure medium supply lines and the pressure-free return line connecting channels (64 a, 64 b, 64 c, 64 d, 64 e, 64 /, 64 g, 64 h). 3. Device according to claim 1 and 2, characterized in that the switching device is formed by at least two pairs of contacts (65, 66 a, 66 b) through which the switching of the quadrant valve (57) into one or the other adjacent position electromagnetically or by electric motor is effected. 4. Device according to claim 3, characterized by means (72, 73), with the help of which the The valve body (62) engages in the valve position and is held against automatic rotation, without the electromagnetic or electromotive switching of the quadrant valve (57) is prevented. 5. Device according to claim 4, characterized in that the means consist of one with the Valve body (62) rotatable Maltese cross (72) and one under spring load radially in this engaging role (73) exist. For this purpose 2 sheets of drawings