CA2022881A1 - Clamping apparatus for mould parts of injection moulding machines - Google Patents
Clamping apparatus for mould parts of injection moulding machinesInfo
- Publication number
- CA2022881A1 CA2022881A1 CA 2022881 CA2022881A CA2022881A1 CA 2022881 A1 CA2022881 A1 CA 2022881A1 CA 2022881 CA2022881 CA 2022881 CA 2022881 A CA2022881 A CA 2022881A CA 2022881 A1 CA2022881 A1 CA 2022881A1
- Authority
- CA
- Canada
- Prior art keywords
- mould
- carrier element
- piston
- pin
- arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/0009—Producing footwear by injection moulding; Apparatus therefor
- B29D35/0018—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1742—Mounting of moulds; Mould supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/0009—Producing footwear by injection moulding; Apparatus therefor
- B29D35/0018—Moulds
- B29D35/0027—Last constructions; Mountings therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Clamping apparatus for mould parts of injection moulding machines Abstract The invention relates to a quick clamping apparatus for mould parts of injection moulding machines having one or more mould stations, whereof the mould (in each case) comprises at least two mould frame parts (15), a bottom die (9) and an upper die (21) which is for example in the form of a last, each of these mould parts (9, 15, 20) being coupled to a carrier element (7, 13, 18) which may traverse in space for the controlled opening and closing of the respective mould, and this coupling between each mould part (9, 15, 20) and its associated carrier element (7, 13, 18) being carried out by means of clamping means (11, 23) which can be locked and unlocked by means of a suitable - for example hydraulic - drive unit - for example clamping means (11) comprising a spreader sleeve actuable in a blind hole, or a clamping apparatus (23) comprising a non-rotationally symmetrical bore and a draw pin rotatable in this bore about its longitudinal axis with a non-rotationally symmetrical pin head - and a locating means (12, 24) integrated therein and/or additional thereto.
Description
2 ~
Clampinq aPparatus for mould parts of injection mouldinq machines _ The invention relates to a quick clamping apparatus for mould parts of injection moulding machines having one or more mould stations which may be moved stepwise past one or more injection units.
Injection moulding machines for producing bodies of elastomeric material in the greatest variety of forms, including multi-coloured ones, for example soles which are injection moulded directly onto shoe uppers or seals which are injection moulded individually or in batches, have long been part of the prior art. They have one or more mould stations, whereof each carries at least one mould comprising at least two mould frame parts (mould halves), a base die and an upper die which may be constructed as a last carrying a shoe upper. To form the mould cavity, which is to be injected with flowable plastics material or rubber by means of one or more injection units, each of these multi-part moulds is first brought together from an opened initial position in three-dimensional space and, after formation of the body to be produced and before it is removed from the mould, is returned to the opened initial position. The means causing these movements primarily acts on various carrier elements to which the above-mentioned mould parts of each mould are secured non-positively but replaceably. Such a type of securing is advisable simply because a specific mould is required for each body of elastomeric material to be produced; for example, when producing soles which are injection moulded directly onto shoe uppers, at least one respective specific mould for each shoe type and each size of such a type is required for a right and a left shoe, but frequently only small runs of such bodies are to be produced at a particular time so that the moulds and thus the above-mentioned mould parts have to be exchanged very frequently without this making complete 2~2~
reassembly o~ the injection moulding machine necessary.
The advantage of such securing also applies to the simpler replacement of moulds or individual mould parts worn during operation or moulds or mould parts which have to be subjected to thorough cleaning, more or less frequently, from quality-impairing residues of the injected material without complete cleaning having to be carried out on the stopped injection moulding machine.
The simplest type of such securing means, most commonly used in accordance with the prior art, are suitably adapted multiple screw connections between each mould part and its carrier element. However, to loosen or tighten such screw connections on the one hand requires an adequately spacious moving apart of all the mould parts, which in the majority of generic injection moulding machines discussed here, which are normally used to produce elastomeric bodies which can be manipulated by hand, makes a larger dimensioning of each mould station than would be absolutely necessary for removal of the product, and on the other hand requires considerable time and thus an undesirably uneconomic stoppage of the injection moulding machine, especially if it has a plurality of mould stations, for example one for the direct injecting of soles onto shoe shafts having the completely usual number of 24 mould stations arranged on a rotary table.
For this reason, DE-PS 35 16 486 has already proposed, at least for the mould frame parts (mould halves), the use of a securing apparatus which is simpler to loosen or tension as regards the respectively associated carrier element, that is to say in this case as regards the guide frame which is installed in such a way that it can traverse in the respective mould receiver, in particular for each mould half on the one hand, a plug-in connection attached at one end of the mould half (the rear end as seen by an observer in front of the injection moulding machine ready for operation) '' ' , ' ,. '' ', ,, ~ ', , ',' -' ''"''i''""'' ', ;:`~. ' ': ' 2 ~
and acting in the longitudinal direction o~ the mould half (i.e. in the direction of viewing of the above-mentioned observer) and comprising a pin non-positively connected to the mould half and a corresponding bore in the guide frame, and on the other hand, a toggle joint installed at the other (front) end of the mould half and acting perpendicular to the longitudinal direction of the mould half and comprising a pin in a bore in the mould half which is axially movable against a spring force and moreover radially movable, and which has lateral pegs at its lower end and a corresponding bore having a screwed-in bushing in the guide frame, this bushing having grooves made to correspond to the above-mentioned pegs and first running parallel to the axis of the bore and then obliquely thereto, so that pressing the pin into the bushing and then rotating it by a certain angle, usually perceptibly smaller than a right angle, produces a non-positive connection between the mould half and the guide frame.
However, this securing apparatus also requires, for actuating the pin by means of a suitable tool, an appreciable minimum spacing between the different mould parts which in many cases is perceptibly greater than that for product removal, and a not inconsiderable time expense for actuating the pin with adequate care in order largely to prevent excessive wear on the toggle joint.
For injection moulding machines which only work with two-part mould tools, DE-GM 82 37 075.3 further proposed equipping each mould tool half on its rear side to face the respective mould carrier with a maximum of two, preferably four, clamping pins which extend into corresponding bores in the mould carrier and are fixed there by means of locking arrangements, these locking arrangements being arranged and actuable in further bores intersecting the above-mentioned bores and emerging at the side of the mould carrier, in particular in the form of hydraulically actuated slides cooperating with -~
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corresponding openings in the clamping pins. In these cases, positioning may either be by means of known pairs of guide pins/guide bores between the two mould tool halves or by means of frustoconical centring bases located on the rear side of each mould tool half and cooperating with corresponding depressions in the respectively associated mould carrier. A prerequisite for a securing apparatus described above is, however, an adequate minimum size of the mould carriers for .receiving the above-mentioned bores for the clamping pins and locking arrangements, the dimensions of which are subject to a minimum size, without impairing stability of the mould carrier, and adequate space provision for installation of the hydraulic drives, the dimensions of which are also subject to a minimum size, of the locking arrangements on at least two side faces of each mould carrier. In the case of the currently discussed injection moulding machines having only two-part mould tools, whereof normally one mould tool half is rigidly connected to the stand of the injection moulding machine and only the other mould tool half can traverse linearly, the above-mentioned conditions for a broad ra~ge of sizes of the bodies to be produced from elastomeric material or the associated mould tools can be fulfilled as regards the construction relatively easily. In the case of the injection moulding machines, which are interesting per se, having at least four mould parts to each mould, which are in general only used to produce bodies of elastomeric material in dimensions which permit manipulation by hand, these dimensions also applying to the required mould parts, such fulfilment of the above-mentioned conditions is however at best possible in exceptional cases, since with these machines, because of the large number of moving parts, the aim is usually precisely to prevent excessive use of energy and excessive mechanical stress in a complete mould station or injection moulding machine by displacing masses which are as small as possible along . ~ ., .. ~ ~., j. , 2~2'3~
the shortest possible paths, which also means that the dimensions of the carrier elements ~or the mould parts are in general too small to fulfil the above-mentioned conditions, quite apart from the fact that in the present case, in contrast to an injection moulding machine with only two-part mould tool, a mutual spatial impairment of the outsides of all mould parts also occurs.
It is thus the object of the present invention to provide, also for injection moulding machines having more than two mould parts respectively per injection moulding, a quick clamping apparatus for locking the mould parts to the respective carrier elements of a mould station, with the aid of which quick clamping apparatus a simple replacement, in particular requiring a very short time, of mould parts may be carried out on injection moulding machines.
According to the present invention, there is provided clamping apparatus for mould parts of injection moulding machines having at least one mould station including a mould comprising at least two mould frame parts, a bottom die and an upper die, each of these mould parts being coupled to a carrier element which may traverse in space for the controlled opening and closing of the mould, wherein the coupling between each mould part and its associated carrier element is carried out by means of a clamping means which can be locked and unlocked by means of a drive unit and a locating means intergrated therein and/or additional thereto.
In this connection, it proves particularly advantageous that the coupling between each mould part and its associated carrier element is carried out by means of clamping means which may be locked and unlocked by means of the drive unit and a locating means which is integrated therein and/or additional thereto, since in this manner only the drive unit needs be actuated to unlock the clamping means in order then to be able to remove a mould part from its carrier element by means of ;., :: . .: : . ::
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a geometrically simple hand movement or a suitable aid, place a new mould part on its carrier element in a correspondingly simple manner and then lock this mould part on its carrier element by actuating the drive unit for locking the clamping apparatus. In the case of a generic injection moulding machine for moulding soles directly onto shoe uppers mounted on lasts, with an entirely conventional equipment of 24 mould stations arranged on a rotary table, with in each case two lasts on a rotary last head as the upper die arrangement, for example the down time for replacing all mould parts using the quick clamping apparatuses according to the invention may be reduced by comparison with the hitherto conventional screw connections from appro~imately 30 - 45 minutes to approximately 5 minutes. Since, however, such a machine may be used to produce approximately 800 shoes per hour, the use of the quick clamping apparatuses according to the invention in this case means that the loss in production of at least 300 shoes when completely changing the moulds on a single machine may be prevented - which on such machines may well be conventional more often than once per eight-hour shift.
With the quick clamping apparatus according to the invention, it is also advantageous that its use requires no expensive new constructions in the conventional carrier elements and tempering plates, especially if the quick clamping apparatus, in a particularly advantageous embodiment, has at least one arrangement comprising a pin-type arrangement projecting out of the carrier element - where appropriate including a tempering plate arranged thereon - in the direction of the mould part to be coupled, and a corresponding opening in the mould part to be coupled, as the lockable and unlockable clamping means, locking and unlocking thereof then being effected by a restricted axial movement, controlled by a suitable drive unit, of the pin-type arrangement or part thereof.
In this case, it is generally sufficient to provide the - : . ., . . ; ~ ~.
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respective carrier element and/or any tempering plates with plain or threaded bores in which parts of the pin-type arrangement and the drive thereof or parts thereof are then arranged, it being possible for certain parts of the pin-type arrangement also to be connected non-positively to the carrier element, for example by being screwed into the opening or separate screw connections after insertion in the opening. This embodiment of the quick clamping apparatus according to the invention moreover advantageously permits on the one hand the pin-type arrangement to project out of the carrier element - or the possibly associated tempering plate - only to such an extent that, to place a mould part on or remove it from the associated carrier element, no undesirably large separation of the mould parts with respect to that required for removal of the end product from the mould is necessary, and on the other hand the drive unit may act on the pin-type arrangement from the rear side of each carrier element, where no mutual spatial impairment of the mould parts occurs.
Further advantageous embodiments of the quick ~clamping apparatus according to the invention emerge from the features of sub-claims 8 to 19.
Embodiments of the clamping apparatus according to the invention are illustrated, by way of example only, in the accompanying drawings, in which:
Fig. la shows a section through the diagrammatic side view of a mould station in an injection moulding machine, whereof the mould or moulds are composed in each case from more than two mould parts.
Fig. lb shows a view along the plane of section A-A in Fig. la, partly in opened-up illustration.
Fig. 2 shows a detail from Fig. la of the clamping apparatus 11, on an enlarged scale.
Fig. 3a shows a view along the plane of section B-B from Fig. lb on a different scale, parallel to the plane of the drawing in Fig. la.
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Fig. 3b shows a view along the plane of section C-C from Fig. 3a on an enlarged scale.
Fig. 4a shows a detail from Fig. la of the clamping apparatus Z3, on an enlarged scale.
Fig. 4b shows a view in the direction of the arrow A in Fig. 4a on an enlarged scale, partly opened up.
Firstly, Fig. la shows the frame 1 of a mould station belonging to an injection moulding machine, the connection between the frame 1 and the stand of the injection moulding machine, for example that of a rotary table arrangement for mould stations, being taken as known and thus not illustrated explicitly. An integral component of the frame 1 which is rigidly connected thereto, is a mould receiver 2 having the shape of a tank open to the top and the front with an opening 3 .in its base region. The frame 1 and the mould receiver 2 have both the drives of all the mould parts required to produce an injection moulding, and the carrier elements connected to these drives and moved thereby for the various mould parts.
Installed on the base region of the frame 1 is a piston-and-cylinder arrangement 4 to be actuated pneumatically or hydraulically, the action of a pneumatic or hydraulic medium thereon being indicated symbolically by the double-headed arrows 5. The piston rod 6 of this piston-and-cylinder arrangement 4 is guided through the opening 3 of the mould receiver 2 and supports a lifting table 7 which in turn supports on its upper side a tempering plate 8 connected non-positively to it. A
bottom die 9 rests on the plate 8. Through an opening 10 in the tempering plate 8, the bottom die 9 is frictionally connected, firmly but replaceably, by means of a clamping apparatus 11 to the lifting table 7, the exact position of the bottom die 9 with respect to the lifting table 7 or the associated tempering plate 8 being ensured by a locating means in the form of a locating pin 12. The clamping apparatus 11, whereo~ only an ~22,~
indication is given here, and which comprises a blind bore 25 in the bottom die 9, a sleeve 26 which is fitted non-positively therein and which is of wear-resistant material, a spreader sleeve 27 which may be pushed in and out of the sleeve 26, and a pneumatic or hydraulic piston-and-cylinder arrangement 31, displacing the spreader sleeve 27 on a frustoconical mandrel 28 connected to the lifting table 7, is illustrated in more detail in Fig. 2 and is explained below in detail in the context of the description of this Fig. 2.
To the side of the bottom die 9 are shown parts of a guide frame 13, which in the present illustration is substantially behind the bottom die 9 and which can traverse by means of a drive of known type, not illustrated explicitly, on rails 14 firmly connected to the mould receiver 2 and here only visible in cross section, this guide frame 13 serving as a carrier element for a mould frame part 15, also illustrated partially.
Arranged on the mould receiver 2 are, here shown purely diagrammatically, two piston-and-cylinder arrangements 16, 17 which in a predetermined initial position of the guide frame 13 within the guide receiver 2 act as drives of clamping apparatuses between the guide frame 13 and the mould frame part 15. The actual arrangement and mode of operation of these drives and clamping apparatuses is illustrated in detail in Figs. 3a and 3b and described below correspondingly. With the present illustration, a precondition is that the plane of the drawing is a mirror plane, so that the mould frame part 15 can in the present case also be designated in conventional manner a mould half 15.
The upper part of the mould station illustrated is formed by a rotary head drive unit 18 which on the one hand can traverse on the frame 1 in the vertical direction, as indicated symbolically by the double-headed arrow 19, and which on the other hand can pivot a rotary head 20 having two or indeed more upper dies 21 arranged ~ ~ ~P 2 '3 ~
thereon in the form of lasts carrying shoe uppers for the purpose of mutual exchange of these upper dies 21, about the axis 22 of the rotary head drive unit 18. In the front part of the rotary head drive unit 18 there is a clamping apparatus 23 which connects the rotary head 20 non-positively to the rotary head drive unit 18, the exact position between the rotary head 20 and the rotary head drive unit 18 here being achieved by a locating means 24, constructed in a manner suitable to its purpose, for example a resiliently mounted ball in one part and a corresponding recess in the other part. A
detailed illustration of the clamping apparatus 23 and a further suitable positioning apparatus are shown in Fig.
4a, whereof a detailed description is also given below.
Fig. lb also shows firstly, in a view along the plane of section A-A in Fig. la, the frame 1 in conjunction with the mould receiver 2, within which there is on the one hand in the centre the bottom die 9 on the tempering plate 8 and which on the other hand supports a pair of parallel rails 14 perpendicular to the longitudinal axis of the bottom die 9, on which there traverse by means of suitable drives of known type, for example, shown diagrammatically here, pneumatic or hydraulic piston~and-cylinder arrangements 39 acting in opposite directions, two guide frames 13 arranged symmetrically with respect to the bottom die 9 and here shown partly opened up, whereof the possibilities of movement are indicated symbolically by the double-headed arrows 40. These guide frames 13, which may possibly be provided with a tempering apparatus of known type, not illustrated here, each carry a mould frame part (mould half) 15, whereof each is connected non-positively and positioned by means of two respective clamping apparatuses 41, 42, here shown in dotted lines, to the associated guide frame 13 for a respectively predetermined length of time. The clamping apparatuses 41, 42 and their mode of operation are described in 2~2~
detail later in this description with reference to Figs.
3a and 3b.
Fig. 2 shows the piston rod 6 from Fig. la for supporting the following: the lifting table 7, the tempering plate 8 non-positively secured thereon, the securing means being of known type and thus not explicitly illustrated, and the bottom die 9 which in turn lies thereon; and also shows the positioning pin 12 which in this case is arranged at a different place than in Fig. la, is inserted with press fit in one of the parts (9 or 8) and guided with sliding fit in the other part (8 or 9). In addition, the clamping apparatus 11 from Fig. la is shown in detail.
This clamping apparatus 11 has, firstly, a bore 25 in the bottom die 9, into which bore 25 there is fitted a sleeve 26 of wear-resistant material under the precondition that the bottom die 9 comprises in a manner not unconventional an aluminium alloy, this fitting being carried out in known manner, for example by screwing in or pressing in. Seated in the sleeve 26 is a spreader sleeve 27 which is on its other side seated on a frustoconical mandrel 28 connected to the lifting table 7, the entire above-mentioned arrangement comprising sleeve 26, spreader sleeve 27 and mandrel 28 being located at least partly in an opening 10 passing through the tempering plate 8. The mandrel 28 is here illustrated as connected intergrally to the lifting table 7, but may also be a separate part connected in any known manner, for e~ample by screwing in or insertion and subsequent screwingj non-positively to the lifting table 7.
Through the frustoconical mandrel 28 there leads a further bore 29 through which the piston rod 30 of a piston-and-cylinder arrangement 31 arranged in the piston rod 6 is guided as far as the sleeve 26 or the bore 25.
At the upper end of this piston rod 30 there is arranged a head 32 which engages non-positively by means of a 2~2~$~:~
peripheral annular spring 33 in a corresponding groove 34 in the upper end of the spreader sleeve 27. The piston 35 at the other (lower) end of the piston rod 30 bears against the spring force of a set of disc springs 36, it being possible however for this spring force to be partly compensated by means of the action of the piston 35 with a pneumatic or hydraulic medium on the side of the piston 35 remote from the set of disc springs 36. The supply and removal line 37 of the fluid pressure medium may run both through the piston rod 6 alone, as shown in Fig. la, or through further parts of the overall arrangement, as shown in the present Fig. 2, to define an optimum connection point which is indicated symbolically both in Fig. la and in Fig. 2 by the double-headed arrow 38.
The function of the clamping apparatus 11 resides in the fact that the latter is normally locked, with the piston 35 bearing only against the pressure force of the set of disc springs 36 without the action of a fluid medium. Then, the piston 35 and thus also the head 32 or the spring 33 reaches its or their lowest point, with the spreader sleeve 27 being drawn to the maximum on the mandrel 28 and pressed against the sleeve 25 so that a frictional connection between bottom die 9 and lifting table 7 is achieved. For unlocking, the piston 35 is acted upon by means of a valve (not shown) with fluid pressure medium such that the pressure force of the set of disc springs 36 is compensated to the extent that the piston 35 and thus the head 32 or the spring 33 move upwards sufficiently for the frictional connection between the bottom die 9 and the lifting table 7 to be removed by the raising of the spreader sleeve 27 from the mandrel ~8, so that the bottom die 9 can be lifted from :
the tempering plate 8. Thereafter, another bottom die 9 can be placed on the tempering plate 8, with correct positioning by means of the positioning pin 12 and the sleeve 26, and then by renewed actuation of the above-mentioned or another valve for removal of the action of a fluid medium on the piston 35, is similarly connected frictionally to the lifting table ,. These completes the replacement process.
Fig. 3a shows firstly a part of the mould receiver 2 in cross section, which is non-positively connected to a pair of rails.14 in known manner and supports, via these rails 14 running perpendicular to the plane of the drawing, a guide frame 13 which can traverse two of these rails 14. Coupled to this guide frame 13 is a mould frame part (mould half) 15 supported thereby, namely by way of two clamping apparatuses 41, 42 which in addition to a non-positive connection of the guide frame 13 and the mould frame part 15 at the same time carry out unambiguous positioning of the mould frame part 15 with respect to the guide frame 13. The movement of the guide frame 13 and-thus also the mould frame part 15 on the rails 14 is controlled by a drive of known type (not shown) which may for example act on the connection point 43 on the guide frame 13.
The clamping apparatuses 41, 42 each comprise a piston-and-cylinder arrangement 44 whereof the piston 45 bears, in the direction of the mould frame part 15 to be coupled, against a pressure force which is generated for example by a set of disc springs 46 or a flat coil spring 47. (The illustration of two different embodiments of the generation of pressure force in an apparatus according to the invention is for the sake of example only; it is not essential). Directed against the pressure force is the piston rod 50 which projects through a bore 51 in the guide frame 13 and a keyhole bore 52 in the mould frame part 15 into an undercut 53 in this mould frame part 15, where it ends in a rotationally symmetrical head 73 which is freely displaceable within the undercut 53 when the clamping apparatus 41 or 42 is unlocked.
On the side remote from the mould frame part 15, the piston 45 projects by means of a section 48 of ~ -, . : . . . :
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smaller diameter through a closure cap 49 slightly out of the guide frame 13, where this section 48 of smaller diameter, in the case shown here of the initial position of the guide frames 13 opposite the mould receiver 2, has its end face opposite the end face of the piston rod 54 of a piston-and-cylinder arrangement 16 and 17 respectively arranged as a separate drive unit. These piston-and-cylinder arrangements 16, 17 are installed on the underside of the mould receiver 2, to be regarded as stationary with respect to the guide frames 13, and project by means of their piston rods 54 through a respective bore 55 in the mould receiver 2 into the intermediate space between the mould receiver 2 and the guide frame 13, with there being no contact in the illustrated rest position of the piston-and-cylinder arrangements 16, 17, that is to say in the locked position of the clamping apparatuses 41, 42, between the end faces of the respective piston sections 48 of smaller diameter and the end faces of the respective piston rods 54. The above-mentioned rest position of the piston-and-cylinder arrangements 15, 17 is brought about by a corresponding known pressure action on the respective piston 56, for example by means of a flat coil spring 57 or the supply of a fluid pressure medium through the supply and removal line 58, whereof the mode of functioning is illustrated symbolically~by the double-headed arrow 59, while the piston-and-cylinder arrangements 16, 17 may for their actuation out of the rest position be acted upon by a pneumatic or hydraullc pressure medium through the supply and removal lines 60, whereof the mode of functioning is illustrated symbolically by the double-headed arrows 61, on the side of their pistons 56 remote from the mould receiver 2.
(The illus~ration of two different embodiments of possible drive units in an apparatus according to the invention is given here only for reasons of demonstratlon and is not mandatory!) - - . ; . . , :,.... .
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Fig. 3b shows the view of one of the identical planes C-C from Fig. 3a, in which the keyhole bore 52 is illustrated from the associated undercut 53 in the mould frame part 15, in addition the external contours 63 of the undercut 53 above the plane of the drawing - inasmuch as they deviate from the cross section of the keyhole bore 52 - being marked by dotted lines in order in this manner to define the edge region 62 of the narrow region of the keyhole bore 52, serving in the locked position of the clamping apparatuses 41, 42 as the bearing surface for the respective head 73 of the associated piston rod 50.
To replace a mould frame part 15 in the respective mould station, first the associated guide frame 13 is put into its initial position for a production cycle, in which position the end faces of the piston rods 54 of the piston-and-cylinder arrangements 16, 17 are directly opposite the end faces of the sections 48 of smaller diameter of the pistons 45 of the clamping apparatuses 41, 42. The heads 73 of the associated piston rods 50 of the clamping apparatuses 41, 42 are here pressed by the set of disc springs 46 (clamping apparatus 41) or by the flat coil spring 47 (clamping apparatus 42) against the edge regions 62 of the narrow regions of the keyhole bores 52 such that they produce both a non-positive and an unambiguously positioned connection between the guide frame 13 and the mould frame part 15. Then, the pistons 56 of the piston-and-cylinder arrangements 16, 17 are acted upon with fluid pressurP medium via the supply and removal lines 60, the supply and removal line 58 being let down at the same time, as a result of which the piston rods 54 and consequently also the piston rods 50 are displaced in the direc~ion of the undercuts 53 in the mould frame part 15. This raises the heads 73 of the piston rods 50 from the edge regions 62 of the narrow regions of the keyhole bores 52 and the mould frame part 15 can be displaced such that the heads 73 of the piston `' " :' :~ , ''' .
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rods 50 are now directly above the extended regions of the keyhole bores 52 - whereof the cross section is in any case larger than that of the heads 73 - and the mould frame part 15 can be withdrawn over the heads 73 - in the present case upwards. By carrying out the above-mentioned steps in precisely the opposite order, another mould frame part 15 is then secured non-positively and in positioned manner on the guide frame 13. The replacement of a mould frame part 15 is thus complete and a new production cycle can be started.
Fig. 4a shows the rotary head drive unit 18 from Fig. la, the axis 22 thereof, the rotary head 20 and the clamping apparatus 23. Instead of the locating means 24, which may be of any construction, in this case and in another place a locating pin 64 is illustrated which is locked in one part (18 or 20) by press fit and guided by a sliding fit in the other part (20 or 18). The clamping apparatus has in turn a piston-and-cylinder arrangement 65, with the piston 66 bearing in the rest position (locked) against the pressure force of a flat coil spring 67 and being acted upon from the other side by a fluid pressure medium, as indicated symbolically by the double-headed arrow 68. The piston rod 69 of the piston-and-cylinder arrangement 65 leads through bores 70, 71 in the rotary head drive unit 18 or in the rotary head 20 and ends behind the rotary head 20 in a head 72 which is not rotationally symmetrical with respect to the longitudinal axis of the piston rod. The bore 71 in the rotary head 20 is correspondingly asymmetric in shape in order to allow the head 72 to pass through the bore 71.
Fig. 4b illustrates this situation, showing the piston rod 69, the bore 71, the head 72 and the positioning pin 64 in a detail from the rotary head 20 in the locked position, namely from the direction of the arrow A in Fig. 4a.
To unlock the last-mentioned clamping apparatus, the piston 66 is acted upon with fluid pressure medium .
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along the double-headed arrow 68 until the head 72 allows the rotary head 20 to be raised to such an extent that the locating pin 64 is released. Then, the rotary head 20 is pivoted about its axis of rotation until the bore 71 can be lifted over the head 72, whereupon removal of the rotary head 20 from the mould station is complete.
Insertion of a new rotary head 20 takes place in steps which are the precise reversal of those mentioned above.
of course, the quick clamping apparatus according to the invention can also be realized by other combinations of the individual components shown, and others with the same action, of the clamping apparatus itself and by other combinations of the clamping apparatuses and mould parts in question, and in particular with corresponding spatial ratios it is of course possible for the separate drive units and clamping apparatuses of the apparatus according to the invention shown in Fig. 3a also to be combined to form clamping apparatuses arranged only on the guide frame with integrated drive units.
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List of Reference Numerals 2 Frame Mould receiver 3, 10 Openings 4, 16, 17, 31, 39, 44, 65 :Piston-and-cylinder arrangements 5, 38, 59, 61, 68 Symbolic double-headed arrows for the action by pneumatic or hydraulic mediu~
Clampinq aPparatus for mould parts of injection mouldinq machines _ The invention relates to a quick clamping apparatus for mould parts of injection moulding machines having one or more mould stations which may be moved stepwise past one or more injection units.
Injection moulding machines for producing bodies of elastomeric material in the greatest variety of forms, including multi-coloured ones, for example soles which are injection moulded directly onto shoe uppers or seals which are injection moulded individually or in batches, have long been part of the prior art. They have one or more mould stations, whereof each carries at least one mould comprising at least two mould frame parts (mould halves), a base die and an upper die which may be constructed as a last carrying a shoe upper. To form the mould cavity, which is to be injected with flowable plastics material or rubber by means of one or more injection units, each of these multi-part moulds is first brought together from an opened initial position in three-dimensional space and, after formation of the body to be produced and before it is removed from the mould, is returned to the opened initial position. The means causing these movements primarily acts on various carrier elements to which the above-mentioned mould parts of each mould are secured non-positively but replaceably. Such a type of securing is advisable simply because a specific mould is required for each body of elastomeric material to be produced; for example, when producing soles which are injection moulded directly onto shoe uppers, at least one respective specific mould for each shoe type and each size of such a type is required for a right and a left shoe, but frequently only small runs of such bodies are to be produced at a particular time so that the moulds and thus the above-mentioned mould parts have to be exchanged very frequently without this making complete 2~2~
reassembly o~ the injection moulding machine necessary.
The advantage of such securing also applies to the simpler replacement of moulds or individual mould parts worn during operation or moulds or mould parts which have to be subjected to thorough cleaning, more or less frequently, from quality-impairing residues of the injected material without complete cleaning having to be carried out on the stopped injection moulding machine.
The simplest type of such securing means, most commonly used in accordance with the prior art, are suitably adapted multiple screw connections between each mould part and its carrier element. However, to loosen or tighten such screw connections on the one hand requires an adequately spacious moving apart of all the mould parts, which in the majority of generic injection moulding machines discussed here, which are normally used to produce elastomeric bodies which can be manipulated by hand, makes a larger dimensioning of each mould station than would be absolutely necessary for removal of the product, and on the other hand requires considerable time and thus an undesirably uneconomic stoppage of the injection moulding machine, especially if it has a plurality of mould stations, for example one for the direct injecting of soles onto shoe shafts having the completely usual number of 24 mould stations arranged on a rotary table.
For this reason, DE-PS 35 16 486 has already proposed, at least for the mould frame parts (mould halves), the use of a securing apparatus which is simpler to loosen or tension as regards the respectively associated carrier element, that is to say in this case as regards the guide frame which is installed in such a way that it can traverse in the respective mould receiver, in particular for each mould half on the one hand, a plug-in connection attached at one end of the mould half (the rear end as seen by an observer in front of the injection moulding machine ready for operation) '' ' , ' ,. '' ', ,, ~ ', , ',' -' ''"''i''""'' ', ;:`~. ' ': ' 2 ~
and acting in the longitudinal direction o~ the mould half (i.e. in the direction of viewing of the above-mentioned observer) and comprising a pin non-positively connected to the mould half and a corresponding bore in the guide frame, and on the other hand, a toggle joint installed at the other (front) end of the mould half and acting perpendicular to the longitudinal direction of the mould half and comprising a pin in a bore in the mould half which is axially movable against a spring force and moreover radially movable, and which has lateral pegs at its lower end and a corresponding bore having a screwed-in bushing in the guide frame, this bushing having grooves made to correspond to the above-mentioned pegs and first running parallel to the axis of the bore and then obliquely thereto, so that pressing the pin into the bushing and then rotating it by a certain angle, usually perceptibly smaller than a right angle, produces a non-positive connection between the mould half and the guide frame.
However, this securing apparatus also requires, for actuating the pin by means of a suitable tool, an appreciable minimum spacing between the different mould parts which in many cases is perceptibly greater than that for product removal, and a not inconsiderable time expense for actuating the pin with adequate care in order largely to prevent excessive wear on the toggle joint.
For injection moulding machines which only work with two-part mould tools, DE-GM 82 37 075.3 further proposed equipping each mould tool half on its rear side to face the respective mould carrier with a maximum of two, preferably four, clamping pins which extend into corresponding bores in the mould carrier and are fixed there by means of locking arrangements, these locking arrangements being arranged and actuable in further bores intersecting the above-mentioned bores and emerging at the side of the mould carrier, in particular in the form of hydraulically actuated slides cooperating with -~
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corresponding openings in the clamping pins. In these cases, positioning may either be by means of known pairs of guide pins/guide bores between the two mould tool halves or by means of frustoconical centring bases located on the rear side of each mould tool half and cooperating with corresponding depressions in the respectively associated mould carrier. A prerequisite for a securing apparatus described above is, however, an adequate minimum size of the mould carriers for .receiving the above-mentioned bores for the clamping pins and locking arrangements, the dimensions of which are subject to a minimum size, without impairing stability of the mould carrier, and adequate space provision for installation of the hydraulic drives, the dimensions of which are also subject to a minimum size, of the locking arrangements on at least two side faces of each mould carrier. In the case of the currently discussed injection moulding machines having only two-part mould tools, whereof normally one mould tool half is rigidly connected to the stand of the injection moulding machine and only the other mould tool half can traverse linearly, the above-mentioned conditions for a broad ra~ge of sizes of the bodies to be produced from elastomeric material or the associated mould tools can be fulfilled as regards the construction relatively easily. In the case of the injection moulding machines, which are interesting per se, having at least four mould parts to each mould, which are in general only used to produce bodies of elastomeric material in dimensions which permit manipulation by hand, these dimensions also applying to the required mould parts, such fulfilment of the above-mentioned conditions is however at best possible in exceptional cases, since with these machines, because of the large number of moving parts, the aim is usually precisely to prevent excessive use of energy and excessive mechanical stress in a complete mould station or injection moulding machine by displacing masses which are as small as possible along . ~ ., .. ~ ~., j. , 2~2'3~
the shortest possible paths, which also means that the dimensions of the carrier elements ~or the mould parts are in general too small to fulfil the above-mentioned conditions, quite apart from the fact that in the present case, in contrast to an injection moulding machine with only two-part mould tool, a mutual spatial impairment of the outsides of all mould parts also occurs.
It is thus the object of the present invention to provide, also for injection moulding machines having more than two mould parts respectively per injection moulding, a quick clamping apparatus for locking the mould parts to the respective carrier elements of a mould station, with the aid of which quick clamping apparatus a simple replacement, in particular requiring a very short time, of mould parts may be carried out on injection moulding machines.
According to the present invention, there is provided clamping apparatus for mould parts of injection moulding machines having at least one mould station including a mould comprising at least two mould frame parts, a bottom die and an upper die, each of these mould parts being coupled to a carrier element which may traverse in space for the controlled opening and closing of the mould, wherein the coupling between each mould part and its associated carrier element is carried out by means of a clamping means which can be locked and unlocked by means of a drive unit and a locating means intergrated therein and/or additional thereto.
In this connection, it proves particularly advantageous that the coupling between each mould part and its associated carrier element is carried out by means of clamping means which may be locked and unlocked by means of the drive unit and a locating means which is integrated therein and/or additional thereto, since in this manner only the drive unit needs be actuated to unlock the clamping means in order then to be able to remove a mould part from its carrier element by means of ;., :: . .: : . ::
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a geometrically simple hand movement or a suitable aid, place a new mould part on its carrier element in a correspondingly simple manner and then lock this mould part on its carrier element by actuating the drive unit for locking the clamping apparatus. In the case of a generic injection moulding machine for moulding soles directly onto shoe uppers mounted on lasts, with an entirely conventional equipment of 24 mould stations arranged on a rotary table, with in each case two lasts on a rotary last head as the upper die arrangement, for example the down time for replacing all mould parts using the quick clamping apparatuses according to the invention may be reduced by comparison with the hitherto conventional screw connections from appro~imately 30 - 45 minutes to approximately 5 minutes. Since, however, such a machine may be used to produce approximately 800 shoes per hour, the use of the quick clamping apparatuses according to the invention in this case means that the loss in production of at least 300 shoes when completely changing the moulds on a single machine may be prevented - which on such machines may well be conventional more often than once per eight-hour shift.
With the quick clamping apparatus according to the invention, it is also advantageous that its use requires no expensive new constructions in the conventional carrier elements and tempering plates, especially if the quick clamping apparatus, in a particularly advantageous embodiment, has at least one arrangement comprising a pin-type arrangement projecting out of the carrier element - where appropriate including a tempering plate arranged thereon - in the direction of the mould part to be coupled, and a corresponding opening in the mould part to be coupled, as the lockable and unlockable clamping means, locking and unlocking thereof then being effected by a restricted axial movement, controlled by a suitable drive unit, of the pin-type arrangement or part thereof.
In this case, it is generally sufficient to provide the - : . ., . . ; ~ ~.
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respective carrier element and/or any tempering plates with plain or threaded bores in which parts of the pin-type arrangement and the drive thereof or parts thereof are then arranged, it being possible for certain parts of the pin-type arrangement also to be connected non-positively to the carrier element, for example by being screwed into the opening or separate screw connections after insertion in the opening. This embodiment of the quick clamping apparatus according to the invention moreover advantageously permits on the one hand the pin-type arrangement to project out of the carrier element - or the possibly associated tempering plate - only to such an extent that, to place a mould part on or remove it from the associated carrier element, no undesirably large separation of the mould parts with respect to that required for removal of the end product from the mould is necessary, and on the other hand the drive unit may act on the pin-type arrangement from the rear side of each carrier element, where no mutual spatial impairment of the mould parts occurs.
Further advantageous embodiments of the quick ~clamping apparatus according to the invention emerge from the features of sub-claims 8 to 19.
Embodiments of the clamping apparatus according to the invention are illustrated, by way of example only, in the accompanying drawings, in which:
Fig. la shows a section through the diagrammatic side view of a mould station in an injection moulding machine, whereof the mould or moulds are composed in each case from more than two mould parts.
Fig. lb shows a view along the plane of section A-A in Fig. la, partly in opened-up illustration.
Fig. 2 shows a detail from Fig. la of the clamping apparatus 11, on an enlarged scale.
Fig. 3a shows a view along the plane of section B-B from Fig. lb on a different scale, parallel to the plane of the drawing in Fig. la.
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Fig. 3b shows a view along the plane of section C-C from Fig. 3a on an enlarged scale.
Fig. 4a shows a detail from Fig. la of the clamping apparatus Z3, on an enlarged scale.
Fig. 4b shows a view in the direction of the arrow A in Fig. 4a on an enlarged scale, partly opened up.
Firstly, Fig. la shows the frame 1 of a mould station belonging to an injection moulding machine, the connection between the frame 1 and the stand of the injection moulding machine, for example that of a rotary table arrangement for mould stations, being taken as known and thus not illustrated explicitly. An integral component of the frame 1 which is rigidly connected thereto, is a mould receiver 2 having the shape of a tank open to the top and the front with an opening 3 .in its base region. The frame 1 and the mould receiver 2 have both the drives of all the mould parts required to produce an injection moulding, and the carrier elements connected to these drives and moved thereby for the various mould parts.
Installed on the base region of the frame 1 is a piston-and-cylinder arrangement 4 to be actuated pneumatically or hydraulically, the action of a pneumatic or hydraulic medium thereon being indicated symbolically by the double-headed arrows 5. The piston rod 6 of this piston-and-cylinder arrangement 4 is guided through the opening 3 of the mould receiver 2 and supports a lifting table 7 which in turn supports on its upper side a tempering plate 8 connected non-positively to it. A
bottom die 9 rests on the plate 8. Through an opening 10 in the tempering plate 8, the bottom die 9 is frictionally connected, firmly but replaceably, by means of a clamping apparatus 11 to the lifting table 7, the exact position of the bottom die 9 with respect to the lifting table 7 or the associated tempering plate 8 being ensured by a locating means in the form of a locating pin 12. The clamping apparatus 11, whereo~ only an ~22,~
indication is given here, and which comprises a blind bore 25 in the bottom die 9, a sleeve 26 which is fitted non-positively therein and which is of wear-resistant material, a spreader sleeve 27 which may be pushed in and out of the sleeve 26, and a pneumatic or hydraulic piston-and-cylinder arrangement 31, displacing the spreader sleeve 27 on a frustoconical mandrel 28 connected to the lifting table 7, is illustrated in more detail in Fig. 2 and is explained below in detail in the context of the description of this Fig. 2.
To the side of the bottom die 9 are shown parts of a guide frame 13, which in the present illustration is substantially behind the bottom die 9 and which can traverse by means of a drive of known type, not illustrated explicitly, on rails 14 firmly connected to the mould receiver 2 and here only visible in cross section, this guide frame 13 serving as a carrier element for a mould frame part 15, also illustrated partially.
Arranged on the mould receiver 2 are, here shown purely diagrammatically, two piston-and-cylinder arrangements 16, 17 which in a predetermined initial position of the guide frame 13 within the guide receiver 2 act as drives of clamping apparatuses between the guide frame 13 and the mould frame part 15. The actual arrangement and mode of operation of these drives and clamping apparatuses is illustrated in detail in Figs. 3a and 3b and described below correspondingly. With the present illustration, a precondition is that the plane of the drawing is a mirror plane, so that the mould frame part 15 can in the present case also be designated in conventional manner a mould half 15.
The upper part of the mould station illustrated is formed by a rotary head drive unit 18 which on the one hand can traverse on the frame 1 in the vertical direction, as indicated symbolically by the double-headed arrow 19, and which on the other hand can pivot a rotary head 20 having two or indeed more upper dies 21 arranged ~ ~ ~P 2 '3 ~
thereon in the form of lasts carrying shoe uppers for the purpose of mutual exchange of these upper dies 21, about the axis 22 of the rotary head drive unit 18. In the front part of the rotary head drive unit 18 there is a clamping apparatus 23 which connects the rotary head 20 non-positively to the rotary head drive unit 18, the exact position between the rotary head 20 and the rotary head drive unit 18 here being achieved by a locating means 24, constructed in a manner suitable to its purpose, for example a resiliently mounted ball in one part and a corresponding recess in the other part. A
detailed illustration of the clamping apparatus 23 and a further suitable positioning apparatus are shown in Fig.
4a, whereof a detailed description is also given below.
Fig. lb also shows firstly, in a view along the plane of section A-A in Fig. la, the frame 1 in conjunction with the mould receiver 2, within which there is on the one hand in the centre the bottom die 9 on the tempering plate 8 and which on the other hand supports a pair of parallel rails 14 perpendicular to the longitudinal axis of the bottom die 9, on which there traverse by means of suitable drives of known type, for example, shown diagrammatically here, pneumatic or hydraulic piston~and-cylinder arrangements 39 acting in opposite directions, two guide frames 13 arranged symmetrically with respect to the bottom die 9 and here shown partly opened up, whereof the possibilities of movement are indicated symbolically by the double-headed arrows 40. These guide frames 13, which may possibly be provided with a tempering apparatus of known type, not illustrated here, each carry a mould frame part (mould half) 15, whereof each is connected non-positively and positioned by means of two respective clamping apparatuses 41, 42, here shown in dotted lines, to the associated guide frame 13 for a respectively predetermined length of time. The clamping apparatuses 41, 42 and their mode of operation are described in 2~2~
detail later in this description with reference to Figs.
3a and 3b.
Fig. 2 shows the piston rod 6 from Fig. la for supporting the following: the lifting table 7, the tempering plate 8 non-positively secured thereon, the securing means being of known type and thus not explicitly illustrated, and the bottom die 9 which in turn lies thereon; and also shows the positioning pin 12 which in this case is arranged at a different place than in Fig. la, is inserted with press fit in one of the parts (9 or 8) and guided with sliding fit in the other part (8 or 9). In addition, the clamping apparatus 11 from Fig. la is shown in detail.
This clamping apparatus 11 has, firstly, a bore 25 in the bottom die 9, into which bore 25 there is fitted a sleeve 26 of wear-resistant material under the precondition that the bottom die 9 comprises in a manner not unconventional an aluminium alloy, this fitting being carried out in known manner, for example by screwing in or pressing in. Seated in the sleeve 26 is a spreader sleeve 27 which is on its other side seated on a frustoconical mandrel 28 connected to the lifting table 7, the entire above-mentioned arrangement comprising sleeve 26, spreader sleeve 27 and mandrel 28 being located at least partly in an opening 10 passing through the tempering plate 8. The mandrel 28 is here illustrated as connected intergrally to the lifting table 7, but may also be a separate part connected in any known manner, for e~ample by screwing in or insertion and subsequent screwingj non-positively to the lifting table 7.
Through the frustoconical mandrel 28 there leads a further bore 29 through which the piston rod 30 of a piston-and-cylinder arrangement 31 arranged in the piston rod 6 is guided as far as the sleeve 26 or the bore 25.
At the upper end of this piston rod 30 there is arranged a head 32 which engages non-positively by means of a 2~2~$~:~
peripheral annular spring 33 in a corresponding groove 34 in the upper end of the spreader sleeve 27. The piston 35 at the other (lower) end of the piston rod 30 bears against the spring force of a set of disc springs 36, it being possible however for this spring force to be partly compensated by means of the action of the piston 35 with a pneumatic or hydraulic medium on the side of the piston 35 remote from the set of disc springs 36. The supply and removal line 37 of the fluid pressure medium may run both through the piston rod 6 alone, as shown in Fig. la, or through further parts of the overall arrangement, as shown in the present Fig. 2, to define an optimum connection point which is indicated symbolically both in Fig. la and in Fig. 2 by the double-headed arrow 38.
The function of the clamping apparatus 11 resides in the fact that the latter is normally locked, with the piston 35 bearing only against the pressure force of the set of disc springs 36 without the action of a fluid medium. Then, the piston 35 and thus also the head 32 or the spring 33 reaches its or their lowest point, with the spreader sleeve 27 being drawn to the maximum on the mandrel 28 and pressed against the sleeve 25 so that a frictional connection between bottom die 9 and lifting table 7 is achieved. For unlocking, the piston 35 is acted upon by means of a valve (not shown) with fluid pressure medium such that the pressure force of the set of disc springs 36 is compensated to the extent that the piston 35 and thus the head 32 or the spring 33 move upwards sufficiently for the frictional connection between the bottom die 9 and the lifting table 7 to be removed by the raising of the spreader sleeve 27 from the mandrel ~8, so that the bottom die 9 can be lifted from :
the tempering plate 8. Thereafter, another bottom die 9 can be placed on the tempering plate 8, with correct positioning by means of the positioning pin 12 and the sleeve 26, and then by renewed actuation of the above-mentioned or another valve for removal of the action of a fluid medium on the piston 35, is similarly connected frictionally to the lifting table ,. These completes the replacement process.
Fig. 3a shows firstly a part of the mould receiver 2 in cross section, which is non-positively connected to a pair of rails.14 in known manner and supports, via these rails 14 running perpendicular to the plane of the drawing, a guide frame 13 which can traverse two of these rails 14. Coupled to this guide frame 13 is a mould frame part (mould half) 15 supported thereby, namely by way of two clamping apparatuses 41, 42 which in addition to a non-positive connection of the guide frame 13 and the mould frame part 15 at the same time carry out unambiguous positioning of the mould frame part 15 with respect to the guide frame 13. The movement of the guide frame 13 and-thus also the mould frame part 15 on the rails 14 is controlled by a drive of known type (not shown) which may for example act on the connection point 43 on the guide frame 13.
The clamping apparatuses 41, 42 each comprise a piston-and-cylinder arrangement 44 whereof the piston 45 bears, in the direction of the mould frame part 15 to be coupled, against a pressure force which is generated for example by a set of disc springs 46 or a flat coil spring 47. (The illustration of two different embodiments of the generation of pressure force in an apparatus according to the invention is for the sake of example only; it is not essential). Directed against the pressure force is the piston rod 50 which projects through a bore 51 in the guide frame 13 and a keyhole bore 52 in the mould frame part 15 into an undercut 53 in this mould frame part 15, where it ends in a rotationally symmetrical head 73 which is freely displaceable within the undercut 53 when the clamping apparatus 41 or 42 is unlocked.
On the side remote from the mould frame part 15, the piston 45 projects by means of a section 48 of ~ -, . : . . . :
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smaller diameter through a closure cap 49 slightly out of the guide frame 13, where this section 48 of smaller diameter, in the case shown here of the initial position of the guide frames 13 opposite the mould receiver 2, has its end face opposite the end face of the piston rod 54 of a piston-and-cylinder arrangement 16 and 17 respectively arranged as a separate drive unit. These piston-and-cylinder arrangements 16, 17 are installed on the underside of the mould receiver 2, to be regarded as stationary with respect to the guide frames 13, and project by means of their piston rods 54 through a respective bore 55 in the mould receiver 2 into the intermediate space between the mould receiver 2 and the guide frame 13, with there being no contact in the illustrated rest position of the piston-and-cylinder arrangements 16, 17, that is to say in the locked position of the clamping apparatuses 41, 42, between the end faces of the respective piston sections 48 of smaller diameter and the end faces of the respective piston rods 54. The above-mentioned rest position of the piston-and-cylinder arrangements 15, 17 is brought about by a corresponding known pressure action on the respective piston 56, for example by means of a flat coil spring 57 or the supply of a fluid pressure medium through the supply and removal line 58, whereof the mode of functioning is illustrated symbolically~by the double-headed arrow 59, while the piston-and-cylinder arrangements 16, 17 may for their actuation out of the rest position be acted upon by a pneumatic or hydraullc pressure medium through the supply and removal lines 60, whereof the mode of functioning is illustrated symbolically by the double-headed arrows 61, on the side of their pistons 56 remote from the mould receiver 2.
(The illus~ration of two different embodiments of possible drive units in an apparatus according to the invention is given here only for reasons of demonstratlon and is not mandatory!) - - . ; . . , :,.... .
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Fig. 3b shows the view of one of the identical planes C-C from Fig. 3a, in which the keyhole bore 52 is illustrated from the associated undercut 53 in the mould frame part 15, in addition the external contours 63 of the undercut 53 above the plane of the drawing - inasmuch as they deviate from the cross section of the keyhole bore 52 - being marked by dotted lines in order in this manner to define the edge region 62 of the narrow region of the keyhole bore 52, serving in the locked position of the clamping apparatuses 41, 42 as the bearing surface for the respective head 73 of the associated piston rod 50.
To replace a mould frame part 15 in the respective mould station, first the associated guide frame 13 is put into its initial position for a production cycle, in which position the end faces of the piston rods 54 of the piston-and-cylinder arrangements 16, 17 are directly opposite the end faces of the sections 48 of smaller diameter of the pistons 45 of the clamping apparatuses 41, 42. The heads 73 of the associated piston rods 50 of the clamping apparatuses 41, 42 are here pressed by the set of disc springs 46 (clamping apparatus 41) or by the flat coil spring 47 (clamping apparatus 42) against the edge regions 62 of the narrow regions of the keyhole bores 52 such that they produce both a non-positive and an unambiguously positioned connection between the guide frame 13 and the mould frame part 15. Then, the pistons 56 of the piston-and-cylinder arrangements 16, 17 are acted upon with fluid pressurP medium via the supply and removal lines 60, the supply and removal line 58 being let down at the same time, as a result of which the piston rods 54 and consequently also the piston rods 50 are displaced in the direc~ion of the undercuts 53 in the mould frame part 15. This raises the heads 73 of the piston rods 50 from the edge regions 62 of the narrow regions of the keyhole bores 52 and the mould frame part 15 can be displaced such that the heads 73 of the piston `' " :' :~ , ''' .
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rods 50 are now directly above the extended regions of the keyhole bores 52 - whereof the cross section is in any case larger than that of the heads 73 - and the mould frame part 15 can be withdrawn over the heads 73 - in the present case upwards. By carrying out the above-mentioned steps in precisely the opposite order, another mould frame part 15 is then secured non-positively and in positioned manner on the guide frame 13. The replacement of a mould frame part 15 is thus complete and a new production cycle can be started.
Fig. 4a shows the rotary head drive unit 18 from Fig. la, the axis 22 thereof, the rotary head 20 and the clamping apparatus 23. Instead of the locating means 24, which may be of any construction, in this case and in another place a locating pin 64 is illustrated which is locked in one part (18 or 20) by press fit and guided by a sliding fit in the other part (20 or 18). The clamping apparatus has in turn a piston-and-cylinder arrangement 65, with the piston 66 bearing in the rest position (locked) against the pressure force of a flat coil spring 67 and being acted upon from the other side by a fluid pressure medium, as indicated symbolically by the double-headed arrow 68. The piston rod 69 of the piston-and-cylinder arrangement 65 leads through bores 70, 71 in the rotary head drive unit 18 or in the rotary head 20 and ends behind the rotary head 20 in a head 72 which is not rotationally symmetrical with respect to the longitudinal axis of the piston rod. The bore 71 in the rotary head 20 is correspondingly asymmetric in shape in order to allow the head 72 to pass through the bore 71.
Fig. 4b illustrates this situation, showing the piston rod 69, the bore 71, the head 72 and the positioning pin 64 in a detail from the rotary head 20 in the locked position, namely from the direction of the arrow A in Fig. 4a.
To unlock the last-mentioned clamping apparatus, the piston 66 is acted upon with fluid pressure medium .
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along the double-headed arrow 68 until the head 72 allows the rotary head 20 to be raised to such an extent that the locating pin 64 is released. Then, the rotary head 20 is pivoted about its axis of rotation until the bore 71 can be lifted over the head 72, whereupon removal of the rotary head 20 from the mould station is complete.
Insertion of a new rotary head 20 takes place in steps which are the precise reversal of those mentioned above.
of course, the quick clamping apparatus according to the invention can also be realized by other combinations of the individual components shown, and others with the same action, of the clamping apparatus itself and by other combinations of the clamping apparatuses and mould parts in question, and in particular with corresponding spatial ratios it is of course possible for the separate drive units and clamping apparatuses of the apparatus according to the invention shown in Fig. 3a also to be combined to form clamping apparatuses arranged only on the guide frame with integrated drive units.
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List of Reference Numerals 2 Frame Mould receiver 3, 10 Openings 4, 16, 17, 31, 39, 44, 65 :Piston-and-cylinder arrangements 5, 38, 59, 61, 68 Symbolic double-headed arrows for the action by pneumatic or hydraulic mediu~
6, 30, 50, 54, 69 Piston rods Lifting table 8 Tempering plate 9 sottom die 11, 23, 41, 42 Clamping apparatuses 12, 24, 64 Positioning apparatuses/pins 13 Guide frame 14 Rails Mould frame parts (mould halves) 18 Rotary head drive unit 19 Symbolic double-headed arrow for the lifting movement of the rotary head drive unit Rotary head 21 Upper die 22 Axis of the rotary head drive unit 25, 29, 51, 55, 70, 71 Bores 26 Sleeve of wear-resistant material 27 Spreader sleeve 28 Frustoconical mandrel 32, 72, 73 Heads of piston rods 33 Spring 34 Groove 35, 45, 56, 66 Pistons 36 ! 46 Sets of disc springs 37, 58, 60 Supply and removal lines for fluid pressure media 2~22~
Symbolic double-headed arrows f or the movement of the guide f rames 43 Connection point 47, 57, 67 Flat coil springs 48 Reduced-diameter section of the piston 49 Closure cap 52 Keyhole bores 53 Undercuts 62 ~dge regions of the narrow regions of the keyhole bores 63 External contours of the undercuts
Symbolic double-headed arrows f or the movement of the guide f rames 43 Connection point 47, 57, 67 Flat coil springs 48 Reduced-diameter section of the piston 49 Closure cap 52 Keyhole bores 53 Undercuts 62 ~dge regions of the narrow regions of the keyhole bores 63 External contours of the undercuts
Claims (19)
1. Clamping apparatus for mould parts of injection moulding machines having at least one mould station including a mould comprising at least two mould frame parts, a bottom die and an upper die, each of these mould parts being coupled to a carrier element which may traverse in space for the controlled opening and closing of the mould, wherein the coupling between each mould part and its associated carrier element is carried out by means of a clamping means which can be locked and unlocked by means of a drive unit and a locating means integrated therein and/or additional thereto.
2. Apparatus according to Claim 1, wherein the carrier element for the upper die comprises an upper die mounting or - in the case of using a rotary head equipped with in each case two or more upper dies - a rotary head drive unit.
3. Apparatus according to Claim, 1 wherein the carrier element for the bottom die comprises a lifting table.
4. Apparatus according to Claim 1, wherein the carrier element of each mould frame part comprises a guide frame.
5. Apparatus according to Claim 3, wherein the lifting table is provided on its surface facing the bottom die with a tempering plate non-positively connected to the bottom die.
6. Apparatus according to Claim 4, wherein each guide frame includes an apparatus for tempering the guide frame and thus the mould frame part to be coupled.
7. Apparatus according to Claim 1, wherein each carrier element has at least one pin-type arrangement (27, 28, 32, 33; 50, 73; 69, 72) projecting out of it in the direction of the mould part to be coupled, this pin-type arrangement forming together with a corresponding opening in the mould part to be coupled a clamping means which may be locked and unlocked and whereof the locking and unlocking takes place by means of a restricted axial movement, controlled by the drive unit of the pin-type arrangement or a part thereof.
8. Apparatus according to Claim 7, wherein the drive unit is a pneumatic or hydraulic piston-and-cylinder arrangement arranged independently of the carrier element on the frame or on a mould receiver of the mould station, the piston rod of the piston-and-cylinder arrangement effecting the restricted axial movement of the pin-type arrangement, or a part thereof, only in a predetermined initial position of the carrier element in relation to the frame or the mould receiver of the mould station.
9. Apparatus according to Claim 1, wherein the drive unit is a pneumatic or hydraulic piston-and-cylinder arrangement arranged on or in the carrier element.
10. Apparatus according to Claim 8 or 9, wherein the piston of the piston-and-cylinder arrangement is arranged to be acted upon from both sides with the pneumatic or hydraulic medium.
11. Apparatus according to Claim 8 or 9, wherein the piston of the piston-and-cylinder arrangement is arranged to be acted upon with the pneumatic or hydraulic medium only from one side, and is resiliently biassed from the other side.
12. Apparatus according to Claim 8, wherein the piston rod of the piston-and-cylinder arrangement is non-positively connected directly to the pin-type arrangement or the part thereof provided for a restricted axial movement.
13. Apparatus according to Claim 7, wherein the or at least one of the pin-type arrangements is formed from a conically tapering mandrel connected in fixed manner to the carrier element and a spreader sleeve which is displaced relative thereto, and the corresponding opening is formed by a blind bore.
14. Apparatus according to Claim 7, wherein the or at least one of the pin-type arrangements is a cylindrical pin with a pin head, not necessarily rotationally symmetrical with respect to the longitudinal axis of the pin, and the corresponding opening is a non-rotationally symmetrical bore.
15. Apparatus according to Claim 14, wherein the non-rotationally symmetrical bore is an elongate hole leading through the mould part to be coupled.
16. Apparatus according to Claim 14, wherein the non-rotationally symmetrical bore is a bore undercut in the mould part to be coupled and having a keyhole cross section (bayonet closure).
17. Apparatus according to one Claim 1, wherein the locating means comprising a second clamping means arranged spaced from a first clamping means, for coupling one of the mould parts to its respective carrier element.
18. Apparatus according to Claim 1, wherein spaced from one or more clamping means between a carrier element and its regardless mould part to be coupled, at the same time an arrangement comprising a mandrel-type extension, time an arrangement comprising a mandrel-type extension, connected non-positively to the carrier element or the mould part and a corresponding opening in the opposite surface of the mould part or the carrier element, acts between the carrier element and mould part as a locating means.
19. Apparatus according to Claim 18, wherein the mandrel-type extension is a centring pin lockable with press fit in a blind bore of the carrier element or of the mould part to be coupled, and the corresponding opening is a blind bore with sliding fit for the centring pin in the opposite surface of the mould part or of the carrier element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893926681 DE3926681A1 (en) | 1989-08-12 | 1989-08-12 | QUICK CLAMPING DEVICE FOR MOLDED PARTS OF INJECTION MOLDING MACHINES |
| DEP3926681.8-16 | 1989-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2022881A1 true CA2022881A1 (en) | 1991-02-13 |
Family
ID=6387007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2022881 Abandoned CA2022881A1 (en) | 1989-08-12 | 1990-08-08 | Clamping apparatus for mould parts of injection moulding machines |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0413149A3 (en) |
| CA (1) | CA2022881A1 (en) |
| CS (1) | CS9003961A3 (en) |
| DE (1) | DE3926681A1 (en) |
| RU (1) | RU1826943C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106393507A (en) * | 2016-12-09 | 2017-02-15 | 郑士华 | Special processing device for shoe sole mold |
| CN106585247A (en) * | 2016-12-09 | 2017-04-26 | 黄昌镜 | Mold engraving machine |
| CN110253924A (en) * | 2019-06-04 | 2019-09-20 | 赖碧云 | A kind of shoemaking molding sulfuration process equipment |
| CN115213385A (en) * | 2022-09-19 | 2022-10-21 | 沧州渤海防爆特种工具集团有限公司 | Explosion-proof titanium copper alloy casting processing equipment |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2714866B1 (en) * | 1994-01-07 | 1996-03-29 | Rivabel | Shoe molding set. |
| DE19910190C2 (en) * | 1999-03-01 | 2002-11-14 | Kloeckner Desma Schuhmaschinen | Quick clamping device |
| DE10142753B4 (en) * | 2001-08-31 | 2004-04-22 | Klöckner Desma Schuhmaschinen GmbH | Method for mold clamping in a molding station of an injection molding machine, and molding station |
| KR100674083B1 (en) * | 2005-11-16 | 2007-01-25 | (주) 티피씨 메카트로닉스 | Positioning device |
| CN100548170C (en) * | 2006-07-07 | 2009-10-14 | 王其成 | Automatic mold opening mechanism for footwear |
| CN101850598B (en) * | 2010-06-18 | 2012-12-26 | 天津丽泰鞋业有限公司 | Automatic mould-opening device of two-color plastic rain shoes injection machine |
| CN111941709B (en) * | 2020-08-28 | 2025-06-17 | 温州仲大聚氨酯设备有限公司 | Fully automatic intelligent polyurethane pouring production line |
| CN116039005A (en) * | 2022-12-23 | 2023-05-02 | 深圳市正向精密制造有限公司 | Mold, method for preparing rear hanger and rear hanger |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1413977A (en) * | 1964-08-31 | 1965-10-15 | Improvements to molding installations and equipment | |
| DE1237769B (en) * | 1965-08-26 | 1967-03-30 | Spezialmaschinen Co H Ludwig K | Device for spraying soles onto shoe shafts |
| DE2454731A1 (en) * | 1974-11-19 | 1976-05-20 | Behrens Ag C | Universal injection mould for ready-made soles - comprises basic mould box with interchangeable design and size insert plates |
| SE423604B (en) * | 1978-04-18 | 1982-05-17 | Hakan Sallander | DEVICE FOR FIXING TENSION OF A TWO-DIFFERENT TOOL IN A MACHINE LIKE A PRESSURE OR SIMILAR |
| DE3025156C2 (en) * | 1980-07-03 | 1985-04-25 | A. Römheld GmbH & Co KG, 6312 Laubach | Press with a punching and / or pressing tool |
| DE8237075U1 (en) * | 1981-09-14 | 1984-03-15 | Ludwig Engel KG, 4311 Schwertberg | FASTENING DEVICE FOR THE MOLDING TOOLS OF AN INJECTION MOLDING MACHINE ON MOLDING SUPPORT |
| DE3516486C2 (en) * | 1985-05-08 | 1987-05-07 | Klöckner Ferromatik Desma GmbH, 7831 Malterdingen | Device for directly molding soles to shoe uppers |
| BR8507330A (en) * | 1985-10-08 | 1988-11-01 | Lema Srl | QUICK CONNECTION FOR THE RETENTION OF OPPOSITE MECHANICAL PIECES, ESPECIALLY IN PRESSES FOR THE MAKING OF CERAMIC BRICKS |
-
1989
- 1989-08-12 DE DE19893926681 patent/DE3926681A1/en not_active Ceased
-
1990
- 1990-07-16 EP EP19900113568 patent/EP0413149A3/en not_active Withdrawn
- 1990-08-08 CA CA 2022881 patent/CA2022881A1/en not_active Abandoned
- 1990-08-10 RU SU904830776A patent/RU1826943C/en active
- 1990-08-10 CS CS396190A patent/CS9003961A3/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106393507A (en) * | 2016-12-09 | 2017-02-15 | 郑士华 | Special processing device for shoe sole mold |
| CN106585247A (en) * | 2016-12-09 | 2017-04-26 | 黄昌镜 | Mold engraving machine |
| CN106393507B (en) * | 2016-12-09 | 2018-08-10 | 郑士华 | It is exclusively used in the processing unit (plant) of die for shoe-sole |
| CN110253924A (en) * | 2019-06-04 | 2019-09-20 | 赖碧云 | A kind of shoemaking molding sulfuration process equipment |
| CN115213385A (en) * | 2022-09-19 | 2022-10-21 | 沧州渤海防爆特种工具集团有限公司 | Explosion-proof titanium copper alloy casting processing equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0413149A3 (en) | 1991-08-14 |
| CS275362B2 (en) | 1992-02-19 |
| EP0413149A2 (en) | 1991-02-20 |
| RU1826943C (en) | 1993-07-07 |
| DE3926681A1 (en) | 1991-02-14 |
| CS9003961A3 (en) | 1992-02-19 |
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