WO2018036949A1 - Moule à injection comportant au moins une cavité et procédé permettant l'extraction au moins partielle d'un noyau de moule - Google Patents

Moule à injection comportant au moins une cavité et procédé permettant l'extraction au moins partielle d'un noyau de moule Download PDF

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Publication number
WO2018036949A1
WO2018036949A1 PCT/EP2017/071000 EP2017071000W WO2018036949A1 WO 2018036949 A1 WO2018036949 A1 WO 2018036949A1 EP 2017071000 W EP2017071000 W EP 2017071000W WO 2018036949 A1 WO2018036949 A1 WO 2018036949A1
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WO
WIPO (PCT)
Prior art keywords
segments
group
longitudinal axis
central longitudinal
injection molding
Prior art date
Application number
PCT/EP2017/071000
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German (de)
English (en)
Inventor
Markus Deisinger
Original Assignee
Gkn Driveline International Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gkn Driveline International Gmbh filed Critical Gkn Driveline International Gmbh
Priority to DE112017004186.4T priority Critical patent/DE112017004186A5/de
Publication of WO2018036949A1 publication Critical patent/WO2018036949A1/fr

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Classifications

    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • B29C45/4421—Removing or ejecting moulded articles for undercut articles using expansible or collapsible cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/703—Bellows

Definitions

  • the invention relates to an injection molding tool with a mold core having undercuts and a method for at least partial extraction of a mold core with at least one undercut from an injection molding tool. Furthermore, the invention relates to a mold core, a method for producing a bellows, the use of an injection molding tool for producing a bellows and a bellows made by injection molding.
  • DE 10 2010 004 227 B4 discloses a method and a device for demoulding injection molded hollow bodies with undercuts in the inner contour.
  • the mold core of the injection molding tool is divided into a plurality of segments, which can be moved in the direction of a central longitudinal axis after demolding of a central segment.
  • the object of the present invention is to provide an improved injection molding tool and an improved mold core, an improved method for at least partially extracting a mold core forming at least one undercut, an improved method of manufacturing a bellows, an injection molding tool and an improved bellows ,
  • An injection molding tool having at least one cavity and a mold core which can be arranged in this cavity and has at least one undercut, with an inner core and four groups A, B, C and D of segments, the groups
  • A, B, C and D each consist of two segments, wherein preferably the groups A and D have different segments and / or the group B and C have mutually different or equal segments.
  • the groups A, B, C and D preferably have mutually differently formed segments, that is to say all segment groups A,
  • one group has exactly two segments.
  • Advantage of the proposed injection molding tool is that by the pairwise design of the groups A to D of segments, which are preferably substantially simultaneously movable, workpieces with at least one undercut with a value greater than 40%, preferably greater than 45%, more preferably greater than 50% can be produced and the mandrel is extractable from the workpiece.
  • the extraction of the mandrel takes place in particular after a molding of a hollow body. In particular, the extraction is carried out from the hollow body and the cavity in which the hollow body was formed.
  • mold cores are used to inject hollow body made of plastic, in particular elastomeric or thermosetting plastics or other suitable for injection molding materials with internal threads, noses, depressions, notches, recesses and openings or recesses and other undercuts in its inner contour.
  • hollow bodies are referred to below as workpieces.
  • the workpiece comprises a number of undercuts.
  • the workpiece has at least one fold, preferably a number of folds.
  • a fold includes in particular a fold valley and a fold tip.
  • the workpiece has different sized undercuts.
  • the workpiece has differently formed folds.
  • a covering the pleat tips changed in the longitudinal direction of the workpiece at least in a section in diameter. In a further embodiment, it is provided that a covering the pleat tips in the longitudinal direction of the workpiece at least in a portion tapers or decreases in diameter. In a further embodiment, it is provided that a covering the pleat tips in the longitudinal direction of the workpiece at least partially in diameter remains substantially the same.
  • the workpiece is a
  • Bellows preferably a bellows, in particular for automobiles of any kind, more preferably as trilobe bellows, in particular for tripod joints. Bellows have the particular task of preventing the ingress of dirt into a joint component and the escape of lubricants from the joint component.
  • a pleat area of a bellows may have pleats of decreasing diameter from a hinged end have a shaft-side end, but also in a partial region of the fold region at least two folds may have a same diameter. Outside surfaces of the mandrel form the shape of the inner contour of the workpiece during spraying.
  • the mold core is a bellows-forming mold core. Preferably, after a cooling time has ended, the mold core is extracted from the injection mold.
  • the mandrel Since the inner contour of the workpiece has undercuts, it is necessary that the mandrel has a smaller outer diameter than any inner diameter that is passed during the extraction. In particular, the outer diameter of the mandrel must be smaller than the smallest inner diameter of the workpiece. For this purpose, it is already known from the prior art to break the mold core into segments and to move the segments in the direction of the central longitudinal axis after the removal of an inner core, in order to move out manifestations of the mold core from the undercuts of the workpiece.
  • an undercut is an undercut of the inner contour of a workpiece, in particular a workpiece, which can be produced by means of the mandrel or by means of the injection molding tool.
  • an undercut denotes the ratio of a maximum inner diameter of a pleat tip to a minimum inner diameter of a pleat valley, past which the characteristic for shaping the inner contour of the pleat tip is passed during the extraction from the injection mold.
  • the mold core has a central longitudinal axis.
  • the central longitudinal axis preferably extends in opening directions of the injection molding tool, preferably in the direction of movement of an actuator, by means of which the injection molding tool can be opened.
  • the central longitudinal axis With a substantially rotationally symmetrical workpiece along the longitudinal axis of the workpiece or hollow body, the central longitudinal axis preferably also extends along the central axis of the preferably substantially rotationally symmetrical workpiece.
  • substantially rotationally symmetrical workpiece is at first glance to be rotationally symmetrical, wherein the workpiece may have details, for example flanges or other fastening means, which are not rotationally symmetrical.
  • a group of segments is characterized in particular by the fact that the segments are or can be moved substantially simultaneously.
  • the segments of a group are simultaneously movable on one or more planes whose vector is parallel to the central longitudinal axis. More preferably, a group of segments is formed from the segments that are at least partially extractable from the injection molding tool substantially simultaneously. The movement of the segments of a group may in one embodiment begin and / or end at different times.
  • the closed mandrel is the mandrel in which the inner core and all segments of the groups A, B, C and D are composed and in particular are arranged in a composite which is suitable for the formation of a workpiece.
  • the inner core of the mold core is preferably designed in such a way that it is shaped along its central longitudinal axis from the corresponding cavity of the injection molding tool. se can be moved out of the workpiece.
  • the inner core in a section along at least one plane whose vector is arranged parallel to the central longitudinal axis, round or polygonal, for example, hexagonal or octagonal, designed.
  • the inner core has a number of different diameters along the central longitudinal axis, for example, the inner core can be configured conically or with shoulders, wherein in one embodiment, the diameter in the direction of demolding of the inner core are designed to be larger.
  • the inner core is made coolable. Techniques for cooling a mandrel are known in the art.
  • the two segments of the group A are mirror-symmetrical with respect to a plane on which the central longitudinal axis of the mandrel is arranged. More preferably, the segments of the group A are formed axially symmetrically with respect to the central longitudinal axis. More preferably, the segments of the group A are formed with opposite, preferably parallel, contact walls to the adjacent segments of the groups B and C.
  • the segments of the group A are constructed substantially identical.
  • the segments of the group B are substantially the same design with respect to an outer contour and / or an embodiment of the contact walls. More preferably, the segments of the group A with respect to a plane on which the central longitudinal axis of the mandrel is arranged, arranged opposite one another.
  • the two segments of the group B are mirror-symmetrical with respect to a plane on which the central longitudinal axis of the mandrel is arranged. More preferably, the segments of the group B are formed axially symmetrical with respect to the central longitudinal axis. More preferably, the segments of the group B are formed with opposite and preferably parallel formed contact walls to the adjacent segments of the groups A and / or D. In a further embodiment the segments of group B at least one further contact wall to segments of the group D.
  • the segments of the group B are formed substantially identical in construction.
  • the segments of the group B are substantially the same design with respect to an outer contour and / or an embodiment of the contact walls. More preferably, the segments of the group B with respect to a plane on which the central longitudinal axis of the mandrel is arranged, arranged opposite one another.
  • the segments of the group B are rotationally symmetrical about the central longitudinal axis to each other.
  • the two segments of the group C are mirror-symmetrical with respect to a plane on which the central longitudinal axis of the mandrel is arranged. Further preferably, the segments of the group C are formed axially symmetrically with respect to the center longitudinal axis. More preferably, these segments of the group C are formed with opposite and preferably parallel formed contact walls to the adjacent segments of the groups A and / or D. In a further embodiment, the segments of the group C have at least one further contact wall to segments of the group D.
  • the segments of the group C are formed substantially identical.
  • the segments of the group C are formed substantially the same with respect to an outer contour and / or a configuration of the contact walls. More preferably, the segments of the group C with respect to a plane on which the central longitudinal axis of the mandrel is arranged, arranged opposite one another.
  • the segments of the group B are rotationally symmetrical about the central longitudinal axis to each other.
  • the two segments of the group D are mirror-symmetrical with respect to a plane on which the central longitudinal axis of the mandrel is arranged. More preferably, the segments of the group D are formed axially symmetrical with respect to the central longitudinal axis. More preferably, the segments of the group D are formed with contact walls to the adjacent segments of the groups B and C. In particular, the segments of group D have a number of contact walls with segments of group B and / or C.
  • the segments of the group D are formed substantially the same.
  • the segments of the group D are formed substantially the same with respect to an outer contour and / or a configuration of the contact walls. More preferably, the segments of the group D with respect to a plane on which the central longitudinal axis of the mandrel is arranged, arranged opposite one another.
  • each of the segments of the group D each have a projection. More preferably, this projection is immediately adjacent to the inner core in the retracted state.
  • the projection has a contact wall to the inner core. More preferably, the projection between two contact walls of the segments of the group D to the segments of the groups B and C is arranged.
  • the projection are preferably by means of the segment of the group D, the segments of the groups B and C separated from each other and are not in direct contact.
  • the segments of the group D are rotationally symmetrical about 180 ° with respect to the central longitudinal axis of the mandrel formed and arranged in the mandrel. As a result, the projections of the two segments of the group D are not opposite.
  • the segments of the group D When carrying out a movement, the segments of the group D can be guided past one another perpendicular to the central longitudinal axis of the mandrel and along the central longitudinal axis, whereby an extraction of the segments of the group D from the cavity of the injection molding tool or from the workpiece or hollow body, preferably a bellows , is made possible even with training of undercuts of over 50%, in particular well over 50%.
  • the wall portion of the two segments of the group D adjacent to the inner core in a cross section perpendicular to the central longitudinal axis has a maximum of about 25%, more preferably not more than about 20%, even more preferably no more than about 15% of a total length, formed from the length of Contact walls of the two segments of the group D to the two adjacent segments of the groups B and C, the length of the adjacent to the inner core wall portion and from the side walls of the projection, on.
  • the segments of group A adjoin the inner core in such a way that they project beyond the corners of the inner core.
  • the first, second and / or third wall sections adjoining the inner core are preferably arranged in particular at an angle to one another in accordance with the shape of the inner core.
  • the inner core is designed to be round, wherein the wall section of the group A which borders on the inner core preferably also has a correspondingly round configuration.
  • the inner core of the mold core is preferably designed such that it can be moved out along its central longitudinal axis from the corresponding cavity of the injection molding tool or from the workpiece.
  • the inner core in a section along at least one plane whose vector is arranged parallel to the central longitudinal axis, round or polygonal, for example, hexagonal or octagonal, designed.
  • the inner core has a number of different diameters along the central longitudinal axis, for example, the inner core can be configured conically or with shoulders, wherein in one embodiment, the diameter in the direction of demolding of the inner core are designed to be larger.
  • the inner core is made coolable. Techniques for cooling a mandrel are known in the art.
  • the pairs of segments of each group A to D are substantially identical or mirror-symmetrical to one another.
  • the segments of the Groups A and D are larger in size, with respect to each cross-section of the mandrel, a larger area than the segments of groups B and C.
  • the segments of the group C preferably have a wall section which is at least approximately 30%, more preferably at least approximately 50% longer, which is adjacent to the inner core than the segments of the group B.
  • the segments of the group A have at least two wall sections which are formed at an angle to one another and adjoin the inner core directly. More preferably, the segments of the groups A, B, C and / or D have a single, rectilinear wall portion that is immediately adjacent to the inner core.
  • the segments of the groups A to D are rotationally symmetrical in a rotation about 180 ° about the central longitudinal axis formed and arranged.
  • the segments of the group A, B, C and / or D are substantially congruent, preferably the surfaces forming the workpiece are conical.
  • the geometric configurations are each two segments of a group A, B, C and / or D congruent. More preferably, the two segments of the group D are displaceable differently far perpendicular to the central longitudinal axis of the mandrel, so that at least one of the segments of the group D covers the central longitudinal axis in the shifted state.
  • a circumferential direction of the mandrel alternately segments of the groups A and D and segments of the groups B and C are arranged.
  • the segments of the groups A, C, D, B, A, C, D, B or vice versa are arranged in the circumferential direction.
  • the segments of the groups A, B, D, C, A, B, D, C or vice versa are arranged in the circumferential direction.
  • the two segments of the first groups A and D become preferably first (group A) and last (group D) proceed, whereas the two groups B and C of second segments are temporally moved between them, with a temporal overlap of stopping and incipient operation of successive groups, as geometrically possible, can take place.
  • the groups A and D of segments in a direction of movement substantially perpendicular to the central longitudinal axis, preferably to this, are movable.
  • the segments are preferably moved in a further step after their first movement along the central longitudinal axis of the mandrel.
  • At least one of the groups B and / or C of segments can be moved in at least two directions of movement on at least one plane whose vector is arranged parallel to the central longitudinal axis.
  • the segments of the group B and / or C can be moved in a further step, for example after their movement on the central longitudinal axis, along the central longitudinal axis of the mold core.
  • at least one group B and / or C of segments can be moved in at least two directions of movement on at least one plane whose vector is arranged parallel to the central longitudinal axis.
  • This group of segments is preferably moved in a further step after the first movement along the central longitudinal axis of the mandrel.
  • the operation of the segments of the groups can be done for example hydraulically or pneumatically.
  • the individual segments each have an outer contour that lies opposite the workpiece to be sprayed.
  • the outer contour in the sense of the present invention is thus the part of the surface of a segment which is shaping.
  • the outer contour of a segment forms a partial surface of a preferably rotationally symmetrical body.
  • the group A of segments has an outer contour a and the group D of segments has an outer contour d, the outer Contours a and d are different.
  • the workpiece forming outer contour a and d are different in size.
  • the surface of the outer contour a forming the workpiece is preferably larger than the outer contour d forming the workpiece.
  • the cross-sectional area of a segment A is smaller than a cross-sectional area of the segment D.
  • a surface of the outer contour a is smaller than a surface of the outer contour d.
  • the outer contour a has a smaller surface forming the workpiece than the outer contour d.
  • the cross-sectional area of a segment A is smaller than a cross-sectional area of the segment D.
  • the groups A and D of the segments are movable in one or two directions of movement perpendicular to a central longitudinal axis of the mandrel.
  • the groups B and C of the segments are movable in one or two directions of movement perpendicular to a central longitudinal axis of the mandrel.
  • at least segments of a group preferably the segments of group B and / or C, are movable in at least two directions of movement on at least one plane whose vector is parallel to the central longitudinal axis of the mandrel. The movement on the plane, the vector of which is arranged parallel to the mid-perpendicular of the mold core, can be superimposed in one embodiment at least partially with a movement in the direction of the central longitudinal axis.
  • At least one segment of the group B and / or C is preferably movable in at least two directions of movement, wherein the movements preferably take place substantially successively or simultaneously.
  • at least one segment, preferably the group B and / or C, three, four or more directions of movement preferably substantially successively or simultaneously on at least one plane whose vector is parallel to the central longitudinal axis can perform.
  • the directions of movement of at least individual segments of the group B and / or C are completely overlapped in time or in terms of time. In the case of an overlapping, an oblique or angular movement in the plane whose vector is arranged parallel to the central longitudinal axis, preferably directly or indirectly towards the central longitudinal axis, thus takes place.
  • a group of segments preferably at least one segment of the group B and / or C, moves at least in two directions of movement, in particular on at least one plane whose vector is parallel to the central longitudinal axis, wherein the movements essentially successively or take place simultaneously.
  • a group of segments, preferably at least one segment of the group B and / or C, three, four or more directions of movement preferably substantially successively or at least partially simultaneously on at least one plane whose vector is parallel to the central longitudinal axis performs. If several directions of movement of a segment are superimposed, the result is a resulting direction of movement as a function of the motion vectors of the superimposed directions of movement.
  • the resulting direction of motion is determined by the vector addition of the individual motion vectors.
  • a superimposition of a first movement directions or of a first movement vector with a second movement direction or with a second movement vector is provided substantially temporally towards the end of execution of a movement direction, so that movement directions are in particular only partially overlapped.
  • at least two directions of movement are carried out without superposition of the same time in succession.
  • at least two directions of movement comprise at least one change of direction. It is preferably provided that at least two rectilinear movements tions on a plane whose vector is parallel to the central longitudinal axis, follow each other in time.
  • At least two straight-line movements on a plane whose vector is parallel to the central longitudinal axis are connected to a curved movement, in particular with a change in the direction of movement over time.
  • at least one segment of at least one group executes only a curved movement on a plane whose vector is parallel to the central longitudinal axis.
  • a curved movement is carried out in particular by a superimposition of a plurality of directions of movement or addition of a plurality of motion vectors, which change in particular over time.
  • at least one curved movement is provided on a plane whose vector is parallel to the central longitudinal axis.
  • a superimposition of the movements leads to an oblique or angular movement in the plane whose vector is arranged parallel to the central longitudinal axis, in particular substantially to the central longitudinal axis.
  • each individual segment of the group can be moved successively or simultaneously.
  • each segment of the group moves in each case one of the other segments different direction of movement.
  • at least one direction of movement of the segments of the group takes place radially, that is to say in the direction of the central longitudinal axis.
  • a movement takes place on at least one plane, the vector of which is parallel to the central longitudinal axis, and the movement along the central longitudinal axis occurs simultaneously or substantially one after the other.
  • an embodiment provides that at least one movement of at least one segment of the group is carried out in exactly one or more directions of movement which accompanies a movement along the central longitudinal axis.
  • each individual segment of the groups A to D is successively or simultaneously movable. It is further preferred that each segment of the group B and / or C moves in each case in a different direction of movement of the other segments. It is particularly preferred that at least one movement tion direction of the segments of the group B and / or C radially, that is in the direction of the central longitudinal axis occurs. In a further preferred embodiment, it is provided that a movement takes place on at least one plane, the vector of which is parallel to the central longitudinal axis, and the movement along the central longitudinal axis occurs simultaneously or substantially one after the other. In particular, an embodiment provides that at least one movement of at least one segment of the group B and / or C is carried out in one or more directions of movement preferably successively or partially superimposed, which is at least partially superimposed by a movement along the central longitudinal axis.
  • the segments of group B and / or C are movable in one direction on a plane whose vector is parallel to the central longitudinal axis. In a further embodiment, it is provided that the segments of group A and / or D are movable in one direction on a plane whose vector is parallel to the central longitudinal axis.
  • the groups B and C of segments have identical, mirror-inverted or mutually different outer contours b and c.
  • the group B of segments has an outer contour b and the group C of segments has an outer contour c, wherein the outer contours b and c are different, in particular of different sizes. In one embodiment, it is provided that the group B of segments has an outer contour b and the group C of segments has an outer contour c, wherein the outer contours b and c are the same, in particular the same size.
  • contact walls of the segments of the groups A to D, preferably B and / or C, which are in contact with the inner core are formed differently or identically. More preferably, the contact walls of the segments of the groups b and / or c with the inner core are different or the same size.
  • the contact wall to the inner core of the segment of the group B larger or smaller than the contact wall to the inner core of the segment of the group C.
  • the contact wall of a segment of the group B to the inner core is substantially as large as the contact wall of a segment of the group C to the inner core ,
  • a surface of the outer contours b and / or c are the same size or smaller than the surface of the outer contour a.
  • a surface of the outer contour b is smaller or larger than a surface of the outer contour c.
  • the cross-sectional area of a segment B is smaller or larger than a cross-sectional area of the segment C. It is further provided in an embodiment that in a cross section perpendicular to the central longitudinal axis, the cross-sectional area of Segmentes B is formed the same as a cross-sectional area of the segment C.
  • the segments of the groups B and C have a mutually identically formed or mirror-symmetrical outer contour b and c.
  • the outer contours a, b, c, d in particular an extension direction of at least one undercut, more preferably the ribs of a bellows, adapted to the movements of the individual segments in the extraction of the mandrel.
  • an adaptation takes place in such a way that the extraction of the segments, for example of the groups B and C, takes place without collision with the workpiece to be manufactured, in particular with superposed directions of movement on the central longitudinal axis to and along the central longitudinal axis.
  • an inner side of an edge of a fold of a bellows is angled so that a movement of at least one segment of the mandrel in the direction of the central longitudinal axis and preferably along the central longitudinal axis takes place without collision with the bellows. More preferably, a movement pattern of at least one segment is adapted to the shaping of a flank of the bellows.
  • the respective two segments of the groups A and D and / or the groups B and C are identical. In one embodiment, it is provided that the respective two segments of the groups A and D and / or the groups B and C are mirror-symmetrical.
  • the segments of at least one of the groups A, B, C and / or D are designed to be identical or mirror-symmetrical.
  • the segments of the group B and the segments of the group C are each formed the same and a segment of the group B have a mirror image of a segment of the group C.
  • the two segments of the group D are arranged asymmetrically opposite one another in the mold core. It is further preferred that the segments of the group D are arranged rotationally symmetrical to each other. In one embodiment, it is provided that the two segments of the group D are formed axially symmetrically opposite each other in the mold core.
  • a projection is formed which adjoins the inner core.
  • the projection protrudes from a plane of at least one contact wall to a respective segment of the groups B and / or C. More preferably, the projection is at least partially in contact with at least one segment of the groups B and / or C.
  • the projections are arranged offset opposite to the two segments of the group D in a closed mold core. This has the advantage that the projections during removal from the mold, that is, in particular during the movement of the segments of the group D toward each other, can be guided past one another.
  • the projection has at least two, preferably at least three wall sections, wherein more preferably a first wall section of the projection has a contact with a segment of the group B and a second wall section of the projection has a contact with a segment of the group C. More preferably, a third wall section and further, a fourth wall portion of the protrusion preferably contacts the inner core.
  • the first wall section and the second wall section are configured parallel to one another. In a further embodiment, the first and the second wall section are configured at an angle to each other in a cross section perpendicular to the central longitudinal axis.
  • the angles of the first and / or second wall portions are configured such that the segments of group B and / or C can be moved past the projection substantially immediately perpendicular to the central longitudinal axis.
  • the third and / or fourth wall section are designed such that they rest against the inner core.
  • a fourth wall section is preferably provided when the projection adjoins a corner of the inner core.
  • the inner core is round, wherein preferably the third wall portion is designed to be round.
  • the projection has a first or a second and a third and optionally a fourth wall section.
  • the protrusion is then configured such that the third or fourth wall section adjacent to the inner core connects to a contact wall of the segment to form another segment B or C.
  • the first wall portion having a segment of the group B adjoins the contact wall to a segment of the group B, and more preferably the second wall portion having a segment of the group C is adjacent to a contact wall to a segment of the group C.
  • the first and second wall sections are to be addressed as contact walls to the segments B and C.
  • the segments of the group D each have a first and a second contact wall to a respective segment of the groups B and C, which are formed linearly or collinearly in a cross section to each other. In a further embodiment, it is provided that the segments of the group D each have a first and a second contact wall to a respective segment of the groups B and C, which are arranged on one level or on substantially parallel planes. In a further embodiment, it is provided that the two segments of the group D are moved to different degrees perpendicular to a central longitudinal axis of the mandrel, so that at least one of the two segments of the group D at least partially covers the central longitudinal axis.
  • the segments of the group D can be moved to a central longitudinal axis of the mandrel with different lengths paths.
  • the segments of the group D are moved differently far in the direction of the central longitudinal axis.
  • the group D is movable in such a way that, in the case of the movement oriented in the direction of the central longitudinal axis, at least one segment can be moved closer to the central longitudinal axis than a further segment of the group. More preferably, the segments in the movement in the direction of the central longitudinal axis are asymmetrically positionable with respect to the central longitudinal axis. In a further embodiment, it is provided that at least one segment is at least partially movable beyond the central longitudinal axis.
  • Groups A, B, C and / or D mirror-symmetrically or axially symmetrically to each other are movable, preferably axially symmetric with respect to the central longitudinal axis.
  • the mold core for an injection molding tool in one embodiment comprises an inner core and four groups A, B, C and D of segments, wherein the groups A, B, C and D each consist of two segments.
  • segments of the different groups are preferably arranged alternately, and the groups A, B, C, D of segments are movable in a direction of movement substantially perpendicular to a central longitudinal axis of the mandrel.
  • the segments of the groups B and C are movable in two directions of movement on at least one plane whose vector is arranged parallel to the central longitudinal axis.
  • the segments of the groups A, B, C and / or D are also designed to be movable along the central longitudinal axis of the mandrel.
  • the present invention alternatively proposes a mold core for an injection molding tool having an inner core and having four groups A, B, C and D of segments, wherein the groups A to D each consist of two segments and, in a circumferential direction of the mold core, alternately segments of different groups, preferably in the order A, C, D, B, A, C, D, B or A, B, D, C, A, B, D, C are arranged.
  • the two segments of the group A and / or D mirror-symmetrical with respect to a perpendicular extending through this and the central longitudinal axis of the mandrel in its length comprehensive plane formed. More preferably, the segments of the group A and / or D are formed mirror-symmetrically opposite.
  • these segments of the group A and / or D are formed with opposite, parallel and rectilinear contact walls to the adjacent segments of the groups B and C. More preferably, the mandrel according to the invention segments of the groups B and / or C, each with opposite, parallel and rectilinear contact walls each having a segment of the groups A and D.
  • the segments of the group D in a cross-section rectilinear, preferably plane trained contact walls to the segments of the groups B and C. More preferably, each of the segments of the group D each have a projection. More preferably, this projection is immediately adjacent to the inner core in the retracted state. More preferably, the projection between the two contact walls of the segments of the group D to the segments of the groups B and C is arranged. Due to the advantage of the group D segment, the segments of Groups B and C are separated and not in direct contact. Preferably, the segments of the group D are rotationally symmetrical about 180 ° with respect to the central longitudinal axis of the mandrel formed and arranged in the mandrel.
  • the projections of the two segments of the group D are not opposite.
  • the segments of group D can be guided past one another perpendicular to the central longitudinal axis of the mandrel and along the central longitudinal axis, thereby extracting the segments of group D from the cavity of the injection molding tool or from the workpiece or hollow body, preferably a bellows is also possible with the formation of undercuts of more than 50%.
  • the wall portion of the two segments of group D adjacent to the inner core has a maximum of about 25%, more preferably not more than about 20%, even more preferably no more than about 15% of a total length formed by the length of the contact walls of the two segments of the group D to the two adjacent segments of the groups B and C, the length of the adjacent to the inner core wall portion and from the side walls of the projection, on.
  • the pairs of segments of each group A to D are formed identically.
  • the segments of groups A to D have a larger size, with respect to each cross-section of the mandrel a larger area, than the segments of groups B and C.
  • the segments of the group C preferably have a wall section which is at least about 30%, more preferably at least 50% longer and which is adjacent to the inner core than the segments of the group B.
  • the segments of group A have two wall sections which are formed at an angle to one another and which directly adjoin the inner core. More preferably, the segments of group B and / or C have a unique gene, rectilinear wall portion, which is immediately adjacent to the inner core.
  • the segments of the groups A to D rotationally symmetrical in a rotation of 180 ° around the central longitudinal axis formed and arranged. More preferably, the two segments of the group D are displaceable differently far perpendicular to the central longitudinal axis of the mandrel, so that at least one of the segments of the group D covers the central longitudinal axis in the shifted state. Furthermore, a method for at least partial extraction of a mandrel from an injection molding tool described above having at least one cavity, in which the mandrel is arranged, is proposed
  • the inner core is moved at least partially out of the mandrel along a central longitudinal axis of the mandrel
  • the group A of segments is moved in a direction of movement perpendicular to the central longitudinal axis
  • the group A is moved by segments along the central longitudinal axis
  • one of the groups B or C is moved by segments on at least one plane perpendicular to the central longitudinal axis, these being moved substantially successively or simultaneously in one or two directions of movement, in a fifth step one of the groups B or C of segments the middle longitudinal axis is moved,
  • the fourth and the fifth step are repeated with the other group B or C of segments, wherein the fourth step step can already begin when the fifth step is partially, preferably about 25% of the travel preferably about 50% of the travel, more preferably about 75% of the travel, took place,
  • the group D of segments is moved in a direction of movement perpendicular to the central longitudinal axis, and in an eighth step, the group D of segments is moved along the central longitudinal axis until the mold core is extracted from the injection mold.
  • An advantage of the proposed method over the prior art is that by arranging and dividing the groups A, B, C and D, even with undercuts of more than about 40%, preferably more than about 42%, more preferably more than about 45 %, and more preferably more than about 50% of the individual segments from the undercuts of the workpiece can be moved out.
  • the group A is moved in a direction of movement perpendicular to the central longitudinal axis. It is preferably moved in a further step after the first movement along the central longitudinal axis of the mandrel.
  • the group B or C is moved in at least two directions of movement on at least one plane whose vector is arranged parallel to the central longitudinal axis.
  • This group B or C is preferably moved in a further step after the first movement along the central longitudinal axis of the mandrel.
  • the operation of the segments of the groups can be done for example hydraulically or pneumatically.
  • the inner core is moved at least partially out of the mandrel along a central longitudinal axis of the mandrel
  • the group A is moved in a direction of movement perpendicular to the central longitudinal axis
  • the group A is moved along the central longitudinal axis
  • the group B or C is moved on at least the plane perpendicular to the central longitudinal axis, wherein these are moved essentially successively or simultaneously in at least two directions of movement,
  • the respective group B or C is moved along the central longitudinal axis, and -
  • the steps two and three and / or four and five are repeated with further groups C and D until the mold core is extracted from the injection mold.
  • the segments of the group D are moved to a central longitudinal axis of the injection molding tool with different lengths way.
  • Bellows are usually produced by injection blow molding. So far it was only possible in this process to realize undercuts of up to 40%. By contrast, the new injection molding process for producing a bellows allows undercuts of more than 40%, preferably more than 42%, more preferably more than 45%, and even more preferably more than 50%.
  • the injection-moldable material is preferably selected from at least one thermoplastic-elastomeric or duromer or thermosetting material formed.
  • the thermoplastic elastomeric material is preferably selected from a group comprising polyurethanes, polyesters, in particular polyether esters or polyester esters, polyamides and / or polyolefins, in particular polypropylenes and / or polyethylenes.
  • thermosets for example, phenol resins, vinyl ester resins and / or epoxy resins can be used.
  • a use of an injection molding tool described above and / or a mold core described above for injection molding of a bellows is proposed.
  • the pleat bang has at least one undercut in the inner contour of more than 40%, preferably more than about 42%, more preferably about 45%, and even more preferably more than 50% or more.
  • the bellows is one having a trilobe configuration in the joint housing-side binder seat region, the trilobe regions defining an inner diameter of the bellows in relation to the demolding.
  • FIG. 2A shows a mold core according to the invention in a plan view
  • FIG. 2B shows the mold core according to FIG. 2A with the movement directions of the segment groups A to D indicated;
  • FIG. 3 shows the mold core according to FIG. 2, with extracted inner core in different
  • FIG. 4 shows the mold core according to FIG. 2, in which a group A of segments in one
  • Movement direction is perpendicular to a central longitudinal axis method is in different views
  • FIG. 5 shows the mold core in which a group _B of segments on a plane perpendicular to the longitudinal axis is moved in different views
  • FIG. 6 shows the mold core, in which a group C of segments on the plane perpendicular to the central longitudinal axis is moved in different views;
  • FIG. 7 shows the mold core, in which a group D segments is moved in the direction of movement perpendicular to the central longitudinal axis in different views
  • FIG. 9 shows a partial view of a guide section of a segment in combination with guide pins in different views
  • FIG. 10 shows the partial view from FIG. 9 in a first direction in different directions
  • FIG. 1 shows the partial view from FIG. 9 in a second direction in different views
  • FIG. 1 shows a similarly known from EP 0 630 734 AI mold core 1 of an injection molding tool in a schematic representation.
  • 1 A shows a mold core 1 comprising an inner core 3 and segment groups 5 and 7 mounted around it.
  • FIG. 1B shows how the inner core 3 is extracted from the injection mold in the direction of the vector of the image plane and as a result thereof the segments 5.1, 5.2 and 5.3 of the segment group 5 in the direction of a central longitudinal axis 2 from an indicated outer circumference 9 of the undercut of a shaped workpiece, which is not shown for simplicity, is led out.
  • 1C shows that the inner core 3 and the group of segments 5 are extracted from the injection molding tool and a group 7 with the segments 7.1, 7.2 and 7.3 is guided out of the undercut 9 in the direction of the central longitudinal axis 2.
  • the minimum distance 1 3 of the group 7 to the circumference 9 of the undercut is about 25% of the radius of the undercut. Also by variations of the segment geometry or the number of segments is not known from the prior art, undercuts of the inner contour of more than 35% to achieve.
  • FIG. 2A shows a mold core 10 of an injection molding tool according to the invention.
  • the mandrel 10 comprises an inner core 1 6, the at least partially in a first section perpendicular to the central longitudinal axis 20 of the mandrel 10 circular and in a further section perpendicular to the central longitudinal axis 20 polygonal, in particular octagonal, is configured.
  • Around the inner core 16 around segments 18.1 to 1 8.8 are arranged.
  • Fig. 2B illustrates the directions of movement of the individual segments 18.1 to 18.8 by the arrows 1 7, 19, 23, 24, 25 and 26.
  • the two segments 18.1 and 18.2 of group A have contact walls 50.1 to 50.2, which are parallel and rectilinear are each adjacent to a segment of groups B and C.
  • the segments 18.3 and 18.4 of the group B likewise have parallel and rectilinearly formed contact walls 52.1 and 52.2, which each adjoin a segment of the groups A and D.
  • the segments 18.5 and 18.6 of the group C are formed with contact walls 54.1 and 54.2 formed parallel to each other and rectilinear. These contact walls 54.1 and 54.2 respectively adjoin a segment of the groups A and D.
  • the in the supervision area-largest segments 18.7 and 18.8 of group D each have a contact wall
  • Each of the segments 1 8.7 and 18.8 of the group D further has a contact wall 56.2, which in each case is adjacent to a segment 18.4 and 18.3 of the group B.
  • the contact walls 56.1 and 56.2 of the segments 18.7 and 18.8 of group D are interrupted by a projection 58 which has a third wall section 60 immediately adjacent to the inner core 16. This wall section 60 is adjacent to a first wall section 64.1 and a second wall section 64.2 of the projection.
  • the length of the third wall portion 60 in a circumferential direction 62, as illustrated by the corresponding arrow in FIG. 2A, is only about 8% of a total length formed by the length of the third wall portion 60, the length of the first and second wall portions 64.1 and
  • each of the segments 18.7 and 18.8 of the group D In the circumferential direction 62, the segments of the groups A to D alternate.
  • the segments 18.1 to 18.8 are arranged rotationally symmetrical in a rotation about the central axis 20 of 1 80 °.
  • Each pair of segments of each group A to D is formed identically.
  • the mandrel 10 thus has an inner core 16 and two first groups A and D of first segments 18.1, 8.2, 18.7 and 18.8 and two second groups B and C of second segments 18.3 to 18.6, the groups A to D each consist of two segments 18.1 and 18.2 and 18.7 and 1 8.8 and in a circumferential direction of the mandrel alternately first and second segments of the first and the second group.
  • the segments are arranged in the circumferential direction in the order A, B, D, C, A, B, D, C.
  • the segments of the groups in the order A, B, C, D or A, C, B, D are moved.
  • the segments of a group are moved substantially simultaneously.
  • FIG. 3 shows the mold core of Figure 2, wherein the inner core is at least partially extracted. It can be seen in FIG. 3A that the inner core 16 is moved along the central longitudinal axis 20 at least to the extent that the segments 18. 1 and 18. 2 in the direction of the central longitudinal axis 20 can be moved.
  • Fig. 3B shows the top view of the mold core, in which the inner core 16 has been extracted. On the division of the segments 1 8.1 to 18.8 can be seen that only the segments 18.1 and 1 8.2 can be moved directly in the direction of the central longitudinal axis 20.
  • FIG. 4 shows in a sectional view in FIG. 4A and in a plan view in FIG. 4B the segments 18.1 and 18.2 of the mandrel and the workpiece 21.
  • the segments 18.1 and 18.2 are moved in a direction of movement 1 7 perpendicular to a central longitudinal axis 20.
  • FIG. 4A shows that the characteristics 1 1 of the segments 1 8. 1 and 18. 2 are led out of the undercuts 1 2 of the workpiece 21.
  • the outer contour a forms the inside of the workpiece 21.
  • the workpiece 21 is configured as a trilobal bellows for tripod joints and has a number of undercuts 1 2, which are defined as the section between the inside of a pleat tip 1 3 and the inside of a pleat 15, which the expression 1 1, the Wrinkle tip 1 3 forms, at the extraction of the segment 1 8 happens.
  • the bellows has a first inner diameter DI at the level of the pleat tip 1 3, on which an expression 1 1 of the mandrel 10 for forming the first inner diameter DI in the extraction of the mandrel 10 is guided past. Furthermore, the bellows has a second inner diameter D2 at the height of the Faltentales 1 5.
  • the undercut 1 2 shown in FIG. 4A has a value of UC of 51%.
  • FIG. 4A shows that the segments have moved completely out of the undercuts 12 so that they can be extracted from the injection molding tool in the next step along the central longitudinal axis 20.
  • FIG. 4B furthermore shows that the segments 1, 8.1 and 18.2 are moved in the direction of the central longitudinal axis 20 so far that they touch each other.
  • FIG. 5A shows the mold core 10, wherein the segments 18.3 and 1 8.4 are moved on a plane 22 whose vector 23 is arranged parallel to the central longitudinal axis 20.
  • the movement, for example, of the segment 18.3 is divided into a first movement direction 24 and a second movement direction 26, wherein the second movement direction 26 is directed perpendicular to the central longitudinal axis 20 and the first movement direction 24 is perpendicular to the second movement direction 26 is directed.
  • FIG. 5A shows that the movement component 24 in combination with the movement component 26 successfully completes a complete release or a complete withdrawal from undercuts 1 2 of the workpiece 21, even in the case of strong undercuts.
  • FIG. 5B shows that the segments 18.3 and 18.4 are moved along the central longitudinal axis 20 in the direction of the injection-molding train or out of the workpiece 21.
  • FIG. 6A shows a partial view of the segment 1 8.5, which has moved out of the undercuts 12 of the workpiece 21.
  • FIG. 6B shows the position of the segments 18.3 to 1 8.6.
  • the segments 18.3 and 1 8.4 are already partially moved along the central longitudinal axis 20 out of the injection mold when the segments 18.5 and 18.6 are moved.
  • the segments 18.3 to 18.6 form a package which is extracted together from the injection molding tool.
  • 7A shows the remaining segments 1 8.7 and 18.8, which are moved in the direction of the central longitudinal axis 20, in order to extract them likewise from the workpiece 21 or the injection molding tool.
  • the workpiece 21 is a bellows with a hinge-housing-side binder seat region which has trilobe regions 23.1 to 23.3. Such a bellows makes the application of an adapter ring superfluous. It is suitable for tripod joints. 7B it can be seen that the workpiece 21, the triloben regions 23.1 to 23.3 having. These deviate from the rotational symmetry of the workpiece 21. In order to demould the segments 1 8.7 and 18.8 from the workpiece 21 without colliding with the trilobes 23.1 to 23.3, the segments 1 8.7 and 18.8 of this group are moved differently far in the direction of the central longitudinal axis 20 of the injection molding tool. In FIG.
  • FIG. 7B shows the segment 18.8 has traveled a greater travel path in the direction of the central longitudinal axis 20 than the segment 1 8.7 and thus the segments 1 8.7 and 18.8 occupy an asymmetrical holding position or position with respect to the central longitudinal axis 20, from which the segments 1 8.7 and 18.8 are extracted from the workpiece or the injection molding tool.
  • 7C shows the segments 18.7 and 1.8.8 with respect to the central longitudinal axis 20 in a position before they are moved in a direction of movement perpendicular to the central longitudinal axis 20.
  • Fig. 7D shows the segments 1 8.7 and 18.8 with respect to the central longitudinal axis 20 in a position after they have been moved in a direction perpendicular to the central axis.
  • Fig. 8 shows schematically a drive 28 for demolding a mandrel of a
  • the drive 28 comprises an actuator 36 which is designed here as a hydraulic cylinder. Furthermore, the drive 28 comprises at least one control plate 30, which comprises guide pins 32. The guide pins 32 engage in guide recesses 34 which are arranged in guide sections 38 of the segments 18. The movement of a segment 18 and the control plates 30 in the direction of movement along the central longitudinal axis 20 of the mandrel 10 is made possible by latch trains, which are not shown in the figures for the sake of simplicity.
  • FIG. 9 shows, in a schematic view, a guide section 38 of a segment 1 8 which is not further illustrated here.
  • the guide section 38 has two guide recesses 34.1 and 34.2. By the guide portion 34.1 engages a guide pin 32.1 and through the guide recess 34.2 a guide pin 32.2.
  • Fig. 9B shows the section BB of Fig. 9A.
  • Fig. 9C shows the section CC of Fig. 9A.
  • 9D shows the guide section 38 in an isometric view.
  • the leaders ment pins 32.2 and 32.1 each have curvatures.
  • the curvatures of the guide pins 32.2 and 32.1 are designed in such a way that they effect in operative connection with the guide section 38 in the relative passage of the same through the recesses 34.1 and 34.2, respectively in different directions, in particular in mutually perpendicular directions of movement.
  • the guide recesses 34.1 and 34.2 are formed by two elongate recesses whose longitudinal extension is arranged at right angles to each other.
  • the guide recesses 34.1 and 34.2 have passage radii 40, which facilitate sliding of the guide section 38 on the guide pins 32 as they pass through the guide recesses 34.
  • Fig. 10B shows the section B-B of Fig. 10A.
  • Fig. 10C shows the section C-C of Fig. 10A.
  • 10D shows the guide section 38 in an isometric view.
  • 10A to 10D show the movement of the guide portion 38 and thus a segment 1 8, not shown, by means of the movement of the guide pin 32.1 through the guide recess
  • FIG. 11B shows the section B-B of FIG. 11A.
  • FIG. 11C shows the section C-C of FIG. 11A.
  • FIG. 11D shows the guide section 38 in an isometric view. 1 1 A to 1 1 D show the movement of the guide portion 38 upon movement of the guide pin 34.2 through the recess 34.2 through, being guided by the curvature of the guide portion 38 in the direction of arrow 44, wherein the guide pin 32.1 by the longitudinal design of the Guide recess 34.1 does not block the control plate.
  • FIGS. 12A to 2D show four further embodiments of a mandrel 10.
  • the arrangement of the segment groups A to D of the mandrel 10 of FIG. 12A in the circumferential direction 62 is A, B, D, C, A, B, D, C.
  • the segment groups A to D successively substantially perpendicular relation Wese radially to the central longitudinal axis 20 on this to be dealt with.
  • the segment 1 8.8 of the group D is preferably moved further in the direction of the center longitudinal axis 20 than the segment 18.7 of the group D. More preferably, the segment 18.8 is moved so far radially in the direction of the central longitudinal axis 20 that it covers the central longitudinal axis 20.
  • the segment groups A to D are preferably moved only in one direction on a plane perpendicular to the central longitudinal axis.
  • outer contours a, b, c, d in particular an extension direction of the ribs of a bellows, adapted to the movements of the individual segments 1 8.1 to 18.8 in the extraction of the mandrel, so that in particular the segments 1 8.3 to 18.6 of Groups B and C can be extracted from the workpiece.
  • Fig. 12B shows a further embodiment of the mold core in a plan view.
  • the segments 18.7 and 18.8 each have a projection 58. 1 and 58.2.
  • the projection 58.1 is designed such that the segments 18.3 and 18.5 are moved in two directions of movement on a plane whose vector is parallel to the central longitudinal axis 20.
  • the projection 58.2 is configured in such a way that the segment 18.6 is moved in two directions of movement on a plane whose vector is parallel to the central longitudinal axis 20.
  • the adjoining segment 1 8.4 is moved essentially directly perpendicular in the direction of the central longitudinal axis 20.
  • FIG. 12C shows an embodiment of the mandrel 10 in which the segments 1 have 8.7 and 18.8 protrusions 58.1 and 58.2.
  • the projections 58.1 and 58.2 are configured such that the segments 18.3 to 1 8.6 can be moved substantially directly perpendicular to the central longitudinal axis 20.
  • the segments 18.1 to 1 8.8 of ge Stand th in Fig. 1 2C embodiment are for the extraction of the workpiece or injection molding tool in exactly one direction on a plane whose vector is parallel to the central longitudinal axis 20, movable.
  • 12D shows a further variant of the mold core 10, from which the principle of the division of the segments 18.1 to 1 8.8 into the groups A to D can be seen.
  • the segments 1 8.1 to 18.8 of the groups A to D are groupwise substantially perpendicular to the central longitudinal axis movable.
  • the present invention thus provides a method and an injection molding tool with which workpieces, in particular bellows, can be produced for the first time by injection molding, the undercuts having a value greater than 40%, preferably greater than approximately 50%, more preferably greater than approximately 52%. Furthermore, with the invention, a bellows is provided which is produced efficiently and with high quality in Spritzgu ss vide with undercuts greater than about 40%, preferably greater about 50%.
  • Fig. 1 3 shows the embodiment of Fig. 1 2C in an enlarged view. It can be seen that the projections 58.1 and 58.2 of the segments 1 8.7 and 1.8.8 of the group D each have a first wall section 64.1 and a second wall section 64.2, which are angled towards one another. Due to the shape of the inner core 1 6, the third wall section 60. 1 and the fourth wall section 60. 2 are at an angle to one another, since the projections 3, 5 are adjacent to the inner core 1 6 by a third wall section 60. 1 and a fourth wall section 60 58.1 and 58.2 corners 66 of the inner core 1 6 adjacent.
  • the segments 18.1 and 18.2 of the group A adjoin the inner core 16 in such a way that they project beyond the corners 66 of the inner core 16.
  • the adjoining the inner core first, second and third wall sections 68.1, 68.2 and 68.3 are arranged according to the shape of the inner core 16 at an angle to each other.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un moule à injection comprenant une cavité et un noyau de moule présentant une contre-dépouille et pouvant être placé dans cette cavité, ledit noyau comprenant un noyau interne (16) et quatre groupes (A, B, C, D) de segments, les groupes (A, B, C, D) étant chacun constitués de deux segments.
PCT/EP2017/071000 2016-08-25 2017-08-21 Moule à injection comportant au moins une cavité et procédé permettant l'extraction au moins partielle d'un noyau de moule WO2018036949A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112017004186.4T DE112017004186A5 (de) 2016-08-25 2017-08-21 Spritzgusswerkzeug mit mindestens einer Kavität und Verfahren zur zumindest teilweisen Extraktion eines Formkernes

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DE102016115840.2A DE102016115840A1 (de) 2016-08-25 2016-08-25 Spritzgusswerkzeug mit mindestens einer Kavität und Verfahren zur zumindest teilweisen Extraktion eines Formkernes
DE102016115840.2 2016-08-25

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Publication number Priority date Publication date Assignee Title
CN118404775A (zh) * 2024-02-04 2024-07-30 江南大学 一种注塑机注塑模具

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DE1938025A1 (de) * 1969-07-26 1971-01-28 Trilux Lenze Gmbh & Co Kg Spritzgiessform zum Herstellen von Kunststoffhohlkoerpern mit Hinterschneidungen
DE3820084A1 (de) * 1988-06-02 1989-12-07 Hansjuergen Moeser Formwerkzeug zur herstellung von spritzteilen
EP0630734A1 (fr) 1993-06-22 1994-12-28 GEYER GmbH + Co. KG WERKZEUGBAU Procédé de démoulage de corps creux moulés par injection avec des contre-dépouilles dans le contour interne et noyau associé
DE102010004227B4 (de) 2010-01-09 2011-09-01 Poschmann Holding Gmbh & Co. Kg Verfahren und Vorrichtung zum Entformen von Spritzgusshohlkörpern mit Hinterschneidungen in der Innenkontur
US20120153540A1 (en) * 2010-12-16 2012-06-21 Toyoda Gosei Co., Ltd. Die for molding cvj boot and process for molding the same
EP2952327A1 (fr) * 2013-01-29 2015-12-09 JTEKT Corporation Dispositif de fabrication de soufflet pour joint homocinétique, et procédé de fabrication de soufflet pour joint homocinétique

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JPS59150715A (ja) 1983-02-16 1984-08-29 Daiichi Gaiyaa Kk 金型部材
JP5942815B2 (ja) 2012-11-26 2016-06-29 株式会社ジェイテクト 等速ジョイント用ブーツの成形金型
DE102013207002B4 (de) 2013-04-18 2016-03-24 Polytec Plastics Germany Gmbh & Co. Kg Entformungseinheit

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Publication number Priority date Publication date Assignee Title
DE1938025A1 (de) * 1969-07-26 1971-01-28 Trilux Lenze Gmbh & Co Kg Spritzgiessform zum Herstellen von Kunststoffhohlkoerpern mit Hinterschneidungen
DE3820084A1 (de) * 1988-06-02 1989-12-07 Hansjuergen Moeser Formwerkzeug zur herstellung von spritzteilen
EP0630734A1 (fr) 1993-06-22 1994-12-28 GEYER GmbH + Co. KG WERKZEUGBAU Procédé de démoulage de corps creux moulés par injection avec des contre-dépouilles dans le contour interne et noyau associé
DE102010004227B4 (de) 2010-01-09 2011-09-01 Poschmann Holding Gmbh & Co. Kg Verfahren und Vorrichtung zum Entformen von Spritzgusshohlkörpern mit Hinterschneidungen in der Innenkontur
US20120153540A1 (en) * 2010-12-16 2012-06-21 Toyoda Gosei Co., Ltd. Die for molding cvj boot and process for molding the same
EP2952327A1 (fr) * 2013-01-29 2015-12-09 JTEKT Corporation Dispositif de fabrication de soufflet pour joint homocinétique, et procédé de fabrication de soufflet pour joint homocinétique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118404775A (zh) * 2024-02-04 2024-07-30 江南大学 一种注塑机注塑模具

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