DE2144477A1 - Control valve for compression molding - Google Patents

Description

ALEXANDER R. HERZFELD 6 Frankfurt a.m. how

LAWYER SOPHIENSTRASSE S ₂

AT THE LANDGERICHT FRANKFURT A. M. Z I A A H · / 7

Note: Corning Glass Works U.S.A.

Control valve for compression molding

The en inciting concerns eixi control valve for the pressure medium supply a molding press, ins oxider e glass press and the like, as well as a control arrangement for controlling, dex pressing forces of a ' i'oriiij.resse etc.

Glaspres ^ exx usually consist of a relatively heavy cross head, which is actuated by a hydraulic cylinder, and usually at high speed the Ireßstößel and possibly a ringlorm moved back and forth relative to the stresslorm, or moved up and down. The pressing forces exerted result from the shape of the cylinder and the kinetic energy of the Jrreijstoüels, aes üreuzbaiicens, the ring shape, etc. The fairly strong ^. 1-reßkraite are abei ^one especially when j? Oraipresoen smaller dimensions of iStücken difficult to master and control, especially when using split or mehrteilifcfcn standards, the Committee so that undesirable large. L 'ie £, riindung has a iie & elventiJL and a control arrangement for aie, jteuerun _fe of irei.Kraite such i'ormpressen to the task. The hoUUIi _{0 of} this Auigaoe takes place by means of a control valve and a mediation of the same in a disorder, through which the jar pusher is actuated at first with increased speed when the glass press is operated slightly, but at a reduced speed when it is exited. The cone arrangement of the aiiinduxig enables weicerhixi eixxe separation of the clamping forces of the iiixitjforiu voxx dexi 1-reiiK.xaiLuxi, as well as a Verriix ^, eruxi _& des irreßrückes wanrexia of the length of stay of the ireiis pound. Particularly

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KOfJTFN GIROKONTO 460/6863 DEUTSCHE BANK A.C. FRANKFURT A. M. DRESDNER BANK MANNHEIM 8S61 POSTSCHECK FRANKFURT A.M. 6436 ')

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Suitable for this purpose, if this use is not restricted, is the cone valve of the invention, which controls the movement of the actuating cylinder on the one hand, and aes tappet on the other hand, with pressure medium. By the following Preßstößelbewegung lYQcJien and it influenced actuator, the hydraulic actuation of the valve to i, the walls irelistößelDewegun _& interrupted by mechaniscne Kräxte or replaced. In the drawings show:

FIG. 1 is a side view of a glass press using the bending arrangement of the invention;

the figure 2 enlarges the cone valve

and iiii section along section line 2-2 of FIG. 1, and the Jj'ifour 3 along the section line 3-3 of Figure 2, as well as the FIG. 4 the same along the section line 4-4 of FIG. 3;

the B'i & ur 5 times the valve housing from behind with the jjeitun &sanschiuss;

the iifeur b shows the shelf arrangement

senema table, together with a front view of a connected glass press.

The control valve 50 will first be described in detail. The cylindrical valve housing 5? Contains a longitudinal boning leading through it with z ^ iiiiCixischen ünüteile 57 »bc · from ^ röüerer Aeite as the middle part. The middle of the central part of the longitudinal bore is bordered by a first couple of hanging ducts bc :, b $ in the housing wall, with one of these xting ducts being connected by the housing through the first and second pressure inlets 6 ", c ^. A second couple of transfer ducts b4, b5 circumferentially in the housing wall be _fe ienzt to the central part aer LingsDohrung. by gene = iuse Lm ^ ren. first and z »s / eite DrucJt-iiiitieläuslaßkanäle 72, 73, which are connected with one of the wingkanale, jjjbenialls the Umian _& aes The third jraar iting channels t> o, bV in the housing ... and. rDUi.ueu unu xührexi auxcn the housing. Furthermore, each with one of the i ^ iuteile 5 / » ¹ ^ ct ^ex 'longitudinal bore i? b veruunaene, through the exact iihrexide driuüe u ^ d fourth

? ü, / Ί provided.

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In the longitudinal bore 56 i ^ß t zjlindnischer a slider 59 is provided. Lr is longer than the longitudinal bore and is composed of a middle piece that can slide tightly in the longitudinal bore and the two end pieces 59a, 59b protruding from the ends 57 »58 of the longitudinal bore and have a smaller diameter than the middle piece. In the wall of the middle piece of the slide run first and second ring channels 60 and 61 which normally connect the pressure medium outlet channels 7 * and 75 to the ring channels 66 and 67.

cuffs 80 and Ö5 surround tightly fitting but easy to slide the end pieces in one dex * iuid part each of the longitudinal bore 59a, 59b of the slide 59 · The sleeves have flanges provided and have a shorter length than the iLndteile 5V, 5ö · i »he flange ends are in the interior of the end parts. One pressure or spiral band 01, 86 each surrounds one of the Cuffs öü, 85 and is with one end against the corresponding mansehettenilansch supported. At the other end of the There is one spring each, which closes the end parts 57 »5Ö of the longitudinal bore cap ö2, 87 attached, at least one of these Tapping has an opening O2 a aligned with the longitudinal bore aui, by which the jmastepiece 59a of the slide fits tightly but slidably and protrudes with its free iLnde over the cap.

With the protruding, free end of the end piece 59a are movable back and forth in the longitudinal bore and adjustable with regard to their normal or initial position in this Actuating means 90 connected, these carry adjustable Äüschlakmittel 91 »the movement of the actuators and also limit the slide movement in the longitudinal bore.

A favorable configuration of the ixegelventils is the scope of the middle part of the slide 59 from the very end of the operating king channel 60, 61 uniformly up to its center rejuvenated trained.

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The regulating valve, which can be used in a variety of ways, is particularly advantageous in the regulating arrangement of the invention for regulating the pressing forces of molding presses for glass and the like. Used. FIGS. 1 and 6 show a glass press 11 as an example with a first pressure cylinder or motor 12 with a central flange part 12a which rests on a carrier 14. Of the The lower part 12b of the cylinder 12 extends downwards through a suitable one, which is in turn guided downwards through the carrier 14 opening 14-a. In a widened central part 15c of the cylinder bore 15 of the cylinder 12 runs an annular piston 1 $. The piston is sealing on the outer circumference, a hollow piston rod 16, their upper and lower linden 16a and 16b snugly but slidable through the upper and lower ends 15a and 15b of the cylinder bore 15 of the cylinder are guided. On the surface of an upper flange portion 12c of the cylinder

12 is an ift / escalated carrier 17 for a second pressure fluid cylinder or motor 1b is attached, the piston rod 20 carrying the piston 19 downwards through the lower end of the cylinder 16, the cavity of the upper Part 16a of the piston rod 16, the ring opening in the ring piston

13 of the cylinder 12, and further down through the cavity of the piston rod 16 is guided to the lower end of the lower part 16b, where several, e.g. four slots 1bc through the Wall of the hollow piston rod 1b reach. Four outwardly reaching arms 21 are attached to the lower imde of the piston rod 20, and one of these arms extends through one of these slits. At the lower end of the piston rod 1t> is a die 25 with the upper flange portion 25a and that in contact with the glass arriving molded part 25ß attached. The molded part 25b of the treßstüßels extends downward through an annular shape 2b and is with the mold cavity 27a in the aut of a mold table or support attached form 27 aligned. The ring shape 26 is supported by a plurality of head screws or bolts 2y that point downward through suitable openings in the flange part 25a of the ioriustoßels 25 range and are attached to the ring shape 2b. The through

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The diameter of the openings is slightly larger than that of the screws oner bolt. The ends of the arms 21 are at the lower end of the Piston rod 20 beiesti & t and with links extending downwards 30, which sometimes come into contact with the surface of the Hingform 26.

The inventive control valve 50 is shown in FIG ■ attached to the outside of the cylinder 12, so that the Rolls 51 »52 with cams 33» 34 in the manner described below Way to work together. The slide 59, which regulates the application of pressure to the piston 13, is on the other hand by the mechanical actuation means 90 under the action of the cams following the movement of the Hofel piston 1b towards the end of the upward and downward stroke controlled, with the first tease 33 beating the piston top and the other cam the application of the piston underside with gradual pressure medium Controls reduction to complete cessation of the same according to the nominal shape values.

A first, solenoid-operated four-way valve 121 supplies one end of the Hegelventiia in its starting or normal position 50 with pressure medium, so that the underside of the piston is acted upon. After energizing the associated solenoid coil 12b is the other end of aes laying valve 50 with pressure medium supplied and the underside of the piston 13 beauischlagt. A second, solenoid-operated four-way valve 130 opens in its starting or normal position is the upper end of the cylinder 1ö to Üruckmitcelbehalter or -tank T and supplies after Verexification by excitation, find the solenoid 137 above of the cylinder 1ö with low pressure with large volume and high pressure with small volume.

Operated by an irographer or a timing drum Itegelkoxitakte TD1 and TD2 generate ^ n at the beginning of the Ireßformung at the same time into the closing position exciting the solenoid windings 12b, 137 of the valves 121, 130 and examining the solenoid excitation at the end of the dwell phase of the form cycle, namely the Winding 12b aes valve 121 just before the winding 137 of the valve

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130, so that the mold 2b is held under clamping force, until the ram 25 is withdrawn from the molding in the hollow mold 27

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flat further, more favorable design is another, likewise Solenoid-operated valve 115 is provided which, in its initial or normal position, controls the actuation of the control valve 50 connects to the pressure medium container via the valve 121. Mn more, also by the programmer or the timer drum actuated .Control contact TD5 goes on the linde of the molding phase in the winding of the valve II5 exciting position, so that the surface of the piston 13 and the actuating means of the cone valve are relieved of pressure, and the excitation of the coil at the end of the foruiz ^ klus again interrupt.

In a flat, favorable configuration, the flakes 33 »54 · are vertically adjustable for setting the rice plunger mold stroke. For further explanation, the mode of operation of the Itegel valve according to the invention and the cone arrangement according to the invention will be described using the example of the inclined glass press. It is assumed that the arrangement is in the position shown in FIGS. 1 and 4 and that the control valves assume the initial position of FIG. It is also assumed that the contacts TD1 and TD2 as well as TD3 are in the open position of the figure. Under these conditions, pressure medium flows from the pressure medium source at a pressure head of 500 pei via line 124 and valve 123 into line 122, and from there via valve 121 and line 113 into the section of bore 5b in housing 55 of valve 50 ( see Fig. 3 and b). The pressure level can be adjusted by adjusting the valve 123. The pressure medium now presses against the slide 59 fn of the longitudinal bore, the displacement of which in the drawing 3 according to reciits is prevented by the hollow 52 pressing against the docking 34. If the molding device moves slightly, for example as a result of a leak, the cam 34 also moves downwards, leaves contact with the hollow 52, and the slide is pushed to the right. As a result, the iting channel b3 in the valve housing 55 becomes via the channel b1 in the slide 59

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of the valve 50 is connected to the king duct 67 in this housing (cf. Fig. 5) and pressure medium flows from the 500 psi pressure medium source (Fig. b) via the line 105, the pressure medium outlet duct 75 in the valve 50 into the duct 107 iiu cylinder 12, and from there into the lower one, find the enlarged part 15c of the bore 15 in the cylinder 12 (FIGS. 1 and 3). As a result, the piston 15 with the piston rod 16 is pushed back up into its starting position. The sock 54 comes back into contact with the 'roller 52 and the slide 59 is pushed into the middle position in the longitudinal bore 56 of the housing 55 of the valve 50 and the connection of the inlet channels 63 and 67 in the housing 55 and thus the supply of the enlarged part Interrupt 15c of the cylinder bore 15 with pressure medium. The pressing device 11 is therefore held in the upper position shown in FIGS. 1 and 6 between the individual erection stages or cycles.

^ s, it is assumed that a gob of glass into the mold cavity 27a of the mold is placed 27 (Fig. 1), and the i-rogrammierer vein the time controller drum, the TD1, TD2, TD3 closes in the Frogrammierlolge contacts and opens. First, contacts TD1 and TD2 are closed simultaneously and solenoid coils 13 and 137 of valves 121 and 130 are energized and the valves are adjusted as follows. By adjusting the valve 121, pressure medium flows from the 500 psi source via the line 124, the throttle valve 123, the line 122, the adjusted valve 121, the line 120, the valve 115 which is still in its initial position, the line 112, the enlarged part 57 (Fig. 3 and 3) of the longitudinal bore 5b of a valve housing 55 · At the same time, the enlarged part 58 of the longitudinal bore ^ b connects to the pressure tank T via the lines 115, the valve 121 and the line 119. The pressure medium in the end part 57 of the longitudinal bore in the valve housing 55 presses the slide 59 in the longitudinal bore • ρΌ iiach liiikti (Fig. 3) and thereby connects the ring channel 62 via the hanging channel bO in the slide 59 with the ring channel 6b in the longitudinal bore 5b, so that pressure medium from a 250-1000 psi fluid source via the fluid outlet port

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in the valve 50 with the line, 106 and. from there with the upper end of the enlarged central part 15c of the cylinder bore 15 of the cylinder 12 (Fig. 1) is connected, thereby the piston 13 with the piston rod 1b is pressed down, and the molded part 25b of the ram 25 moves into the Foruiraum 27a of Form 27 and begins the opening of the glass bulb. During the downward stroke, the lower part of the enlarged part 15c of the cylinder bore 15 of the cylinder 12 is connected to the line 104 and thus to the tank T via the channel of the valve 50, the channel 75 and the bing channels 65 and 67 in the valve housing 55.
As a result of the aforementioned adjustment of the valve 130, pressure medium from a source delivering 150 psi, for example, flows from the collecting container 148 via the check valve 147 and the line to the valve (J30, and from there to the line 135 in the upper end of the cylinder 18. The throttle 143 inhibits the flow of pressure medium from the 250-1000 psi supplying source via the normally open, manually operated valve 133 in the line 131. The flow from the collecting container 148 is just sufficient to prevent cavitation of the liquid or the pressure being pumped into the upper end of the cylinder ^ r to avoid the piston 19, since otherwise the downward movement of the piston 16 would drag the piston rod 20 and the piston 19 so much that a partial vacuum could arise above the cylinder 18. When the ring shape 2b hits the shape 27 will the

* Movement of the piston 19 stopped and the high-volume pressurization of the upper end of the cylinder ended. Due to the high pressure supply between the throttle 143 and the lines 131 and 135, a strong pressure is built up in the upper volume of the cylinder 18 and on the ring chamber 2b and mold 27. The downward movement of the piston I3 and the piston rod 1o are followed by the cams 33 and 34 until the hand of the dock 33 touches the roller 5I (FIGS. 1, 3 and 6). The shape of the Jüockenrands is designed, with regard to the tapered shape of the channel 61 in the slide 59, that the slide is pushed back to the right so that the pressure medium can always be relieved of the upper, coarsened part of the cylinder

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bore I5. With the optimum requirements of the Preßpha ^ e and the Committee free as possible throttles press working and speed, iieixn against the iOnapiiase the space between the molding space aiiae 27a of the mold 27 and the mold part 25a of the plunger 25 and the Ringloi-iu 2b (Fig. 1) is filled with the molding material, for example the molten glass, the timer drum closes the contact TD3, excites the solenoid winding 117 and steepens the valve II5 (FIG. b). As a result, the line 112 is connected through the valve 115 to the tank T , so that the pressure medium in the iindteii 57- ih of the longitudinal bore 56 of the valve housing 55 flows back into the tank T. The spring 86 of the valve 50 now pushes the slide 59 to the right and closes all openings and channels of the valve. The main pressure in the upper part of the end 15c of the cylinder bore I5 is released into the lank T via the throttle 144 and the valve 115. The molded part 25b of the plunger 25 now rests on the molded article only with a force corresponding to the sum of its own weight and the weight of the piston rod 1b and the other parts belonging to it. Dage _& en is the ring mold 2b, on the mold 27 by the pressure from the 250 - IGTE 1000 psi source, the hand-beta & valve 135 Clià line I3I, valve 130, line 135, and the upper Lnde clamped the cylinder 1NC, wherein the check valve 147 prevents the return flow to the collecting container 148. If the mold is so large that a larger part of the mold is located on the material to be pressed while pressing the mold area 25b, the insect ram, then the pressure that holds the mold against the mold 27 must be greater than the mold pressure of the ice mold 25. From a source delivering 300-1000 psi, the required higher pressure is given to the line 131 via the knobs 143 with the valve 133 closed and the manual valve 132 open, while the molding cools during a dwell time until it is self-supporting or is sufficiently solidified on the surface . Then the timing drum opens the contact TD1, the excitation of the solenoid winding 12b is interrupted, and the spring 125 returns the valve 121 to its starting position. Now again pressure medium reaches the Mde 5ö of the longitudinal bore 56 in the

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Valve housing 55 and slide 59 are moved to the right again. As a result, pressure medium flows from the 500 psi source via the line 103 "the ring channels 63, 67 of the valve housing 55 - into the pressure medium outlet channel 75" and via the line 10? (Pig. 6) into the lower end of the enlarged part 15c of the cylinder bore 15 (l'ig. 1). At the same time the upper end of the enlarged part 15c of the Zyiinderbonrung is connected via the line 10b and the valve 50 with the line 104 and the tank T, whereupon the piston 15 and the associated parts such as the plunger 25 are pushed upwards, flat in a e.g. 0.06 sec since the interruption of the excitation of the winding 12b of the valve 121, the excitation of the bond 137 of the valve 130 is also interrupted by the opening of the contact TD2 by the timing drum and. the valve 130 is returned to its initial position (FIG. 6;). The time interval of, for example, 0.06 seconds is sufficiently dimensioned that the mold end 25b of the ram 25 worn molding in the molding space 2a of the mold 27 can be withdrawn while it is still Clamp pressure is on the ring shape 2b and holds the mold in the shape, after this dwell time the flange 2pa of aes plunger 25 (Fig. 1) pushes against the screws or bolts 29, and the ring shape is together with the piston 13 and the piston rod 1b as well as the arms 21, the piston rod ^ u, the piston 1y in the cylinder 18 pushed upwards, and the pressure medium in the cylinder head of the cylinder 18 is pushed into the line 135, and via the valve 130 and the line 134 into the tank T. If the return flow takes place before the excitation of the winding 137 is interrupted and the valve 130 is reset, if the lines 135 and / or 13I etc. should break, the pressure is released through the pressure relief valve 140 into the line 141 and the tank T. G At the end of the outward stroke cieö ireßpustels 2ξ> the roller 52 comes into contact with the jaw 34 and the slide 59 is pushed to the left against the pressure force of the juades 5ö of the longitudinal bore of the valve housing 55. x) he contact TD3 is now opened, and the spring 11b returns the valve 115 to its starting position. The device is thus back in its starting position and a new press cycle can begin.

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Claims (4)

Claims. rl.Jßegelventil for a pressure medium flow, characterized by I. a cylindrical valve body 455) J & it a. a longitudinal bore (56) running through the housing cylindrical Jindteile (57,58) of larger cross-section than the middle part, . b. an aen Uinfang of the central part of the longitudinal bore delimiting first pair of king channels (b2, b $) in the housing wall, c. each connected to one of these ring channels, through the Housing first and second pressure medium inlet channels (68,69) » d. one delimiting the umiang of the central part of the longitudinal bore second pair of ring channels (64, b5) in the housing wall, e. first and second pressure medium outlet ducts (7 ^, 73) connected to each of these fiing ducts (64, 65) and leading through the housing, f. one delimiting the circumference of the central part of the longitudinal bore third pair of ring channels (66,67) in the housing wall, G. each with one of these ßingkanäle (66, ö7) connected through a third and fourth pressure medium outlet channels (74,75) leading to the housing, H. $ e with one of the end portions (57,58; connected aer longitudinal bore (.56) lullende through the housing third and fourth DruckmiLteleinlaükanäle (70,71) " II. One arranged in the longitudinal bore (5 * = 0 and its length exceeding, cylindrical slide (59) with a. a _fe in Längsbohrun snugly slidably rilittelstück, b. the oeiden, protruding from aen üjaaen (57,58) of the longitudinal bore (5 ¹ ^ a, 59b) of a smaller diameter than the center piece, c. first and second bing channels (ÖO, 61) in the tfand des Middle section of the ocniebera C59), which is normally the Druakmittelauslaiikanale Connect (74,75) with the upper channels (66,67), 209812/1072 _βΑ0 (still claim 1) fit 2 I 4 4 4 7 7 ' III. first and second end pieces, provided with flanges, each arranged in one of the central parts (57, 58) of the longitudinal bore (59a, 59b) of the slider (59) tightly fitting but slidably encircled cuffs (80, 85) of shorter length than the jiind parts (57,58), the flange ends of which in the inner parts lie, IV one each, the cuffs (80.85). surrounding pressure or spiral links supported with one end against the flange of the cuff (81.8b), V. one each, supported on the other side of the pressure boilers (81, 86), 'the iindteile (57,58) of the longitudinal bore closing cap (82,87), of which at least one is aligned with the longitudinal bore has opening (82a) through which the end piece (59a) of the slide tightly fitting but slidably rests and with his free & nde protrudes over the cap, VI with the protruding, free uide of the end piece (59a) connected, reciprocable in the longitudinal hole and with regard to their normal position inisL this adjustable Actuating means, and VII adjustable, carried by the actuating means (90), their movement and üamit the slide movement in the longitudinal bore adjustable limiting slings (91) 2. Cone valve according to claim 1, characterized in that the circumference of the middle piece of the slide (59) from the outermost iünde of the respective inlet channel (bO, b1) to its center P is evenly tapered. 209812/1072 SAD ORIGINAL 2U4477 3 Rope arrangement for the ₆ eln of compression forces of compression molding for thermoplastic material, glass and the like, with a cylinder actuated by a hollow piston of a pressure center, and a molded rod that fits into a hollow chamber, one through another piston that extends through the hollow piston another cylinder acted upon by pressure medium, and a ring acted upon by a clamping force, shape, characterized by I. a control valve actuated by pressure medium, inter alia, a mechanism (50; for the ^ oauiscniagung the first piston (13) » whose slide regulating the uauckbeaultichlagung (59) in turn controlled by mechanical actuating means (90) will, II. Exotic one una second, associated with the hollow piston (1b) and its BEWE _& ung conductive üocKen (33 »3 ^)" which the mechanical BetcAtifcunfcuiuituel ⁽¹ ^ u) press against ^ ide aes AUL and downstroke, with the first dock ( 33) the Beauischla ₆ ung the iloloenoberseite una aer anuerc üocken (3 ^) controls the application of the piston underside with a gradual reduction of pressure medium until it is completely stopped according to the nominal shape values, II. a first, solenoid-operated four-way valve (121) which, in its starting position, supplies one end of the control valve (50) with pressure medium so that the underside of the piston (13) is opened, and after the oolenoid coil (126) has been energized, the other i ^ nde of the cone valve supplied with pressure medium, soaass the top of the piston is acted upon, I /. a second, solenoid-operated four-way valve (130) which, in its exhaust position, opens the upper end of the cylinder (18) to the pressure medium ^{tank (1} I ¹ J, and, after the excitation of the oleoluiü8i> ulfc! (137), the outer inde of this cylinder with low pressure large volume and high pressure with small volume supplied, 209812/1072 BATH 2UU77 (still. claim $) " V. electrical regulating means (TD1, l'D2), which at the beginning of the ireßiormung lead timely the solenoid windings (12b, 137) of the valves (121, 13Uj excite and at the point of reference of the form circuit, the solenoid excitation, examine the winding (12o) of the valve (121; shortly before a "r. Indun _fe (137) of the valve (130), whereby the Kin & form (2b) is held under a clamp until the Iress plunger (2p) voa in the hollow form (27) is withdrawn. 4. Control arrangement according to claim 3 » characterized by a further, solenoid-operated valve (115) which, in its starting position, connects the actuating means of the regulating valve ^ (50) via the valve (121) to the pressure medium container, and further, electrical reflecting means ( ^f ID3 ), which excite the winding of the valve (115) at the end of the forming phase, so that the surface of the piston (13) and the actuating means of the control valve are relieved of pressure, and the excitation of the Λίη-aung at the end of the cycle. 5 · Control arrangement according to claim. _T 3 or 4, characterized in that the dock (33.34 ·) for. adjustment of the press ram stroke are vertically adjustable. 209812/1072 8AD ORIGfNAL