Guide and centering device

Abstract

To provide a guiding and centering device which ensures desired guiding and centering accuracy without the need of additional accurate centering units.SOLUTION: A device 10 in which both mold halves 1 and 5 are guided and centered by guide means 7 is provided with: a protruded guide body 4 formed as a circular cylindrical bolt 12 provided at the first mold half 1; a guide recess 6 formed as a bush 14, and provided with a cylindrical inner surface 20 on the second mold half 5; and a rolling element cage 16 with rolling elements 17 inserted in a plurality of rows 18. The rolling element cage 16 is supported by the circular cylindrical inner surface 20 of the bush 14 and positioned via positioning means 30 in such a way that when closing the forming tool, the circular cylindrical bolt 12 runs practically simultaneously in a first row of the rolling elements and a second row of the rolling elements of the rolling element cage 16.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a guiding and centering device for guiding and aligning first and second half - molds. The guiding and centering device of the present invention can be used in molding tools such as injection molding tools and die - casting tools, which include a first half - mold and a second half - mold. The first half - mold and the second half - mold are guided by guiding means to be movable from a closed position where the respective parting surfaces of the two half - molds are pressed against each other to an open position, and vice versa. The guiding and centering device is formed from a plurality of protruding guiding bodies attached to the first half - mold and a plurality of guiding grooves attached to the second half - mold. Through these guiding bodies, the two half - molds are accurately guided and centered in the closed position. In particular, the guiding and centering device according to the present invention is preferably configured to be combined with round precision centering used for individual guiding and centering of gaps, parting surfaces, and plate parts, and to provide accurate guiding from the start to the end of centering and guiding with a maximum load capacity.

Background Art

[0002] Molding tools or general molding tools including a first half - mold and a second half - mold are well - known. In such molding tools, the half - molds are provided together with a plurality of plate parts according to the complexity of the mold. These plate parts are guided in a plurality of pillar guides and are movable from a closed position to an open position and vice versa from an open position to a closed position. The mold disposed between the parting surfaces of the two half - molds is filled with, for example, a casting material that is pushed into the mold when the mold is closed.

[0003] Generally, a guiding device at least includes a bush or a sleeve provided on one of the molds having a first bearing surface, a guiding column provided on the other of the molds having a second bearing surface, and a bearing adapted to be in bearing engagement between the bush and the guiding pin or column to reduce sliding friction along the bearing surface when the members are fitted together. Therefore, the bush or the sleeve is formed from a sliding bush that provides a defined sliding surface. However, general problems with sliding friction pairs are known, including jittering or crawling due to unbalanced friction on their sets, and such problems can affect the quality of the workpiece being processed and the lifespan of the guiding device.

[0004] Furthermore, in order to obtain accurate molding of molded products that meet appropriate standards and specifications, it is necessary for the two mold halves forming the mold to be accurately aligned. However, this cannot be ensured within the desired range in a guiding device, particularly in the column guiding part where the mold halves are guided. Therefore, a positioning device, also called a centering device, is used. This device particularly accurately aligns one mold half with the other mold half at the end of the stroke until reaching the end point of the closed position.

[0005] A typical centering device is composed of a first member configured as a guiding pin, or generally configured as a male mold part, attached to one mold half, and a second member attached to the other mold half and configured as a bush or generally configured as a female mold part. The first member and the second member fit together when the mold is closed. The fit between the male mold and the female mold determines the magnitude of misalignment between the mold halves.

[0006] It is known from the prior art to provide an exchangeable insert configured as a bearing with rolling elements between the first bearing surface of the male part and the second bearing surface of the female part. In particular, such an insert is configured as a cage that rotatably supports a plurality of needle bearings or rolling elements, and reduces friction along the bearing surface when the members are fitted together.

[0007] From Patent Document 1 (EP2363263A), a centering device is known in which a plurality of protrusions are each formed as cylindrical bolts, and a rolling element cage in which rolling elements are inserted in a row is disposed thereon. In this device, in the open state, via positioning means, the first row of rolling elements directed toward the first type half part rests on the circular surface of the bolt, and the second row of rolling elements is positioned to rest on the peripheral part terminating at the circular cylindrical surface of the bolt. Each guide groove portion is formed from a sleeve having a circular cylindrical inner surface that abuts against the rolling elements of the rolling element cage when the mold is closed.

[0008] From Patent Document 2 (US2004 / 043103A1), a bearing mechanism of a positioning device for reducing friction along a bearing surface is known. This bearing mechanism moves relatively between a first position and a second position with respect to at least one of a first member having a male part or preferably a second member having male and female parts when they are fitted together. An elastic member elastically supports the bearing mechanism, and a retainer is coupled to the bearing mechanism to oppose the elastic member configured as a spring when the bearing mechanism moves between the first position and the second position. The spring functions as a means for applying a force to the bearing mechanism. The retainer prevents the bearing mechanism from moving beyond a position where only a part of the rolling elements becomes free from the bearing surface supporting the rolling element cage.

[0009] Furthermore, in order to prevent the bearing mechanism from slipping off from the bushing of the positioning device, retainers of different embodiments are known. For example, a locking member such as a snap ring is provided at the entrance of the bushing so that the bearing mechanism can be held therein. Alternatively, the retainer with rolling elements may be provided with an outwardly protruding element that can engage with a contact surface on the inner surface of the bushing.

[0010] In order to obtain a correct molded product, it is necessary that two mold halves forming the mold are accurately aligned, but this is often not achievable with guiding devices and positioning devices known in the art. There is still a need for a guiding and ejecting device that already obtains the maximum load capacity at the start of ejection and ensures accurate alignment and precise guidance of one mold half to the other mold half.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0012] An object of the present invention is to create a guiding and ejecting device that guarantees the desired guiding and ejecting accuracy without the need for an additional precision ejecting unit such as a flat ejecting device. Furthermore, an object of the present invention is to provide a guiding and ejecting device that can suppress wear of the device as low as possible and provides play-free guidance from the start to the end of ejection. Thereby, such a guiding and ejecting device has a long service life and can reduce the replacement cycle. Another object of the present invention is to create a guiding and ejecting device that can be used as a play-free fine ejecting system, is applicable with no lubrication or minimal lubricant, and is configured to be adaptable to different molding tools.

Means for Solving the Problems

[0013] According to the present invention, these objects are a guiding and ejecting device for a molding tool, in particular an injection molding tool or a die-casting tool, comprising a first mold half and a second mold half, which mold halves are guided by guiding means from a closed position in which the respective parting surfaces of both mold halves are pressed against each other to an open position and vice versa. The guiding and ejecting device(s) can be arranged in the molding tool. Each guiding and ejecting device is formed by a protruding guiding body formed by a guiding column in the form of a circular and cylindrical bolt provided on the first mold half, a guiding groove formed as a bush having a circular and cylindrical inner surface provided on the second mold half, and a rolling element cage into which rolling elements are inserted in rows, by which both mold halves are guided to the closed position and accurately ejected.

[0014] Advantageously, the guiding and ejecting device according to the present invention provides a play-free guidance with high reproducibility along the entire stroke path precisely and accurately. This is achieved in particular by a preloaded rolling bearing by the rolling element cage and by the combination of the bush, the bolt and the rolling element cage. Furthermore, the high precision of the positioning of the mold halves is obtained much earlier than reaching the closed position, so that the wear of the contact surfaces of the mold halves is reduced even at high traverse speeds.

[0015] According to the present invention, the rolling element cage is supported by the circular and cylindrical inner surface of the bush and, via positioning means, is positioned such that when the molding tool is closed, the circular and cylindrical bolt runs substantially simultaneously through the first row of rolling elements and the second row of rolling elements of the rolling element cage.

[0016] Due to the advantages of the rolling bearing provided by the rolling element retainer, the need for lubricant is minimized.

[0017] With such an arrangement of the guiding and centering device according to the invention, when the forming tool is closed, a circular and cylindrical bolt runs substantially simultaneously through the first row of rolling elements and the second row of rolling elements, so that a high initial load capacity is already obtained at the start of centering. Furthermore, since the load on the rolling elements and the supporting or centering surface can be divided, wear of the guiding and centering device is reduced and the service life is extended. This problem is particularly advantageous compared to prior art centering systems configured as a guiding block system, where wear of the centering surface will increase due to the very high surface pressure during initial engagement.

[0018] Depending on the geometric configuration of the guiding and centering device, the cage with rolling elements may comprise further row(s) of rolling elements to improve centering.

[0019] In a preferred embodiment of the invention, positioning means adapted to accurately position the cage of rolling elements such that approximately two rows of rolling elements are preloaded and engaged simultaneously between guiding and centering comprises a spring element and an axial retainer element, between which the cage with rolling elements is axially positioned at the circular and cylindrical inner surface of the bush.

[0020] Advantageously, a compression spring as the spring element is inserted into the bush, in particular arranged between the supporting means at one end of the bush and the cage of rolling elements provided in the bush at the opposite end, such that the spring element functions as a biasing element (means for exerting a tensile force in one direction) of the cage with rolling elements. Thereby, the rolling element retainer is positioned by the spring element and abuts against the axial retainer, such that the rolling element retainer is in the correct position when the forming tool is opened. Also, the axial retainer positions the rolling element retainer together with the spring element and can also be used for tools disengaging from the engagement.

[0021] In a preferred embodiment of the present invention, a shoulder protruding inward from the circular and cylindrical inner surface of the bush and / or a groove provided on the circular and cylindrical inner surface of the bush into which a circlip can be inserted are formed at the end portion of the circular and cylindrical inner surface so that the positioning means is supported. For example, a shoulder for supporting a spring element is formed at one end of the circular and cylindrical inner surface, and a groove into which a circlip or a snap ring (stop ring) forming an axial retainer element is inserted is provided at the end on the opposite side of the circular and cylindrical inner peripheral surface. Therefore, inside the bush, the spring element biases (applies a tensile force in one direction) the rolling element cage from one side, and the rolling element cage is held in a predetermined position by the axial retainer element from the other side. By this axial arrangement, accurate axial positioning is ensured. As a result, a desired accurate arrangement of the cage with rolling elements in the bush is achieved and can be manufactured in a simple and inexpensive manner.

[0022] Alternative embodiments of the bush for positioning the arrangement inside the bush are possible. For example, shoulders and grooves can be formed at both ends of the circular and cylindrical inner surface.

[0023] The configuration of the spring element must be such that when the rolling element cage is in the centering start position, the spring element generates sufficient biasing force so that at least the rolling elements in the first and second rows are under preload. In the state where the mold is closed, the force of the spring must not be too large. Otherwise, the rolling element retainer will be pushed by the preload. The spring element is configured such that the rolling element cage is accurately positioned at the open position of the forming tool and further does not depend on the mounting position of the guiding and centering device in the forming tool.

[0024] In another preferred embodiment of the present invention, the bushes and / or guide posts formed from circular cylindrical bolts have a lead-in geometry at their inlet portions. In a preferred embodiment, the lead-in geometry of the bush is configured to be directed towards the rolling element cage, to form an edge of the circular cylindrical inner surface, and to have an end that merges with a second circular cylindrical inner surface. Thus, the point where a complete preload is applied to the rolling elements is accurately defined.

[0025] The circular cylindrical bolt is provided with an edge that encloses its circumferential surface, and this end transitions to a conical drawing-in region that forms the lead-in geometry of the bolt head.

[0026] The bush is provided on the second type of half body and is particularly connectable to the second type of half body. The connection between the bush and the second type of half body is made via a locking member, and the locking member can be inserted into any one of a series of circumferential grooves formed along the axial length of the bush surrounding the bush and protrudes into a groove formed in the second type of half body.

[0027] Furthermore, the guide post configured as a circular cylindrical bolt can be connected to the first type of half body via a locking member. The locking member is configured to surround the bolt and be insertable into one of a series of circumferential grooves formed along the axial length of the bolt, and the insertable locking member protrudes into a groove formed in the first type of half body.

[0028] The locking member can be configured as a circlip, snap ring, or ring part. Preferably, the locking member is configured as two ring parts, and both of these ring parts can be inserted into one of the circumferential grooves forming a complete ring structure. Furthermore, the ring structure is formed by a circumferential groove suitable for incorporating a seal ring so that the two ring parts are firmly fixed in the circumferential groove of the bush.

[0029] Advantageously, by fixing the bush of the second type half and the guide pillar formed from a circular and cylindrical bolt via these locking members that can be arranged individually along at least a part of the axial length of the bush and also along the length of the bolt, individual positioning of the bush and the bolt becomes possible. For example, regardless of the size of the plate part used in the forming tool, in particular adapted to the thickness of the plate part, it is possible to use the guiding and centering device in different situations.

[0030] In another preferred embodiment of the present invention, at least one of the bush and the circular and cylindrical bolt is configured in a lead-in shape. The bolt running in the rolling element cage can advantageously have a lead-in shape at its head part formed from a conical recessed region adjacent to the edge that encloses the circular peripheral surface.

[0031] In another embodiment, the bush has a lead-in geometry in which the circular and cylindrical inner surface of the bush is enclosed at the edge, and adjacent to that edge, a second circular and cylindrical inner surface having a diameter larger than the circular and cylindrical inner surface is provided. Preferably, the circular and cylindrical inner surface of the bush transitions in the region of the edge to a second circular and cylindrical inner surface having a roundness or curvature adapted to the roundness of the rolling element. As a result, the entry of the bolt into the rolling element cage is such that excessive stress is not applied to the rolling element cage, and thus it is advantageous in terms of service life.

[0032] In a preferred embodiment, the rolling elements are rollers or balls, and as a result, the structure of the rolling element cage is simplified and it can be manufactured at low cost. Furthermore, since the rolling elements are configured to perform centering by rolling rather than by sliding centering and to perform line contact, wear is significantly reduced.

[0033] The guiding and centering device according to the present invention allows for a simple and flexible arrangement and can be easily installed and positioned to provide backlash-free guiding and centering. Furthermore, the guiding and centering device of the present invention is suitable for use in a clean room and can achieve very low wear and abrasion, enabling a wide range of applications including long-stroke and short-stroke uses. The guiding and centering device of the present invention has a compact arrangement and can be attached to a forming tool as a plug-and-play (ready to use just by connecting) solution.

[0034] Another advantage of the guiding and centering device according to the present invention is that the bush is compatible with various guiding columns conforming to the same tolerance so that it is not necessary to use a specific guiding column together with the bush constituting the rolling element cage. Therefore, the guiding and centering device provides compatibility and interchangeability and further provides a so-called two-in-one solution that does not require a separate fine centering device from the guiding device. Therefore, since the guiding and centering device combines both guiding and fine centering, an additional fine centering device is not required.

[0035] To more fully understand the present invention and its advantages, exemplary embodiments of the present invention will be described in more detail in the following description with reference to the accompanying drawings. In the drawings, like parts are denoted by like reference numerals.

Brief Description of the Drawings

[0036]

Figure 1

Figure 2

Figure 3

Figure 4a

Figure 4b

Figure 5

[0037] The accompanying drawings are included to provide a further understanding of the invention, are incorporated herein, and constitute a part hereof. The drawings illustrate specific embodiments (s) of the invention and, together with the description herein, serve to explain the principles of the invention.

[0038] Referring to FIG. 1, a known mold configuration with a centering device and guiding means is shown. In the first mold half 1 of the molding tool 2, a guiding body 4 having a cubic shape and protruding is fixed in the region of the parting surface 3. As other forms of the protruding guiding body, a conical shape, a cylindrical shape, etc. are known. Further, guiding means 7 formed from known guiding columns are arranged to guide the moving molding tool 2. Although not shown in FIG. 1, the second half mode 5 (second mold half 5) of the molding tool 2 is provided with a guiding groove 6 having a slot shape and corresponding to the guiding body 4 of the first mold half 1. In the closed state of the molding tool 2, the guiding body 4 is located in the guiding groove 6, enabling optimal alignment of the first mold half 1 and the second mold half 5. Due to the design of the guiding body 4 and the guiding groove 6, in order to enable centering in all directions, it is necessary to use these at least in pairs twice. Therefore, the guiding body 4 and the guiding groove 6 must basically be arranged opposite to each other, and as a result, space problems may occur. Also, in this known centering device, the surface pressure acting on the guiding body and the guiding groove may become very high. Further, the corresponding guiding surfaces must slide against each other, and as a result, wear becomes severe, and as a result, these centering devices must be replaced after a certain period.

[0039] Referring to FIGS. 2 and 3, a guiding and centering device 10 according to the invention is shown in a possible arrangement within the forming tool 2. According to this embodiment, each protruding guiding body 4 consists of a circular and cylindrical bolt 12, in particular the guiding post of the guiding means 7. Each guiding groove portion 6 consists of a bush 14 having a circular and cylindrical inner surface 20 that supports a rolling element cage 16 with rolling elements 17 inserted therein at row 18. The circular and cylindrical bolt 12 travels through the rolling elements 17 of the rolling element cage 16 when the forming tool 2 is closed. FIG. 2 shows the first mold half 1 of the forming tool 2. This forming tool 2 is designed, in particular, as a guiding post known in the prior art and comprises guiding means 7 consisting of a circular and cylindrical bolt 12 according to the invention. Thus, in the illustrated embodiment, generally, the forming tool 2 comprises four guiding sets and four such bolts 12 are inserted into the first mold half 1. In principle, two bolts 12 are required to obtain optimal centering, but depending on the size and configuration of the forming tool 2, any number of bolts 12 can be used in the forming tool 2.

[0040] FIG. 3 shows a perspective view of the forming tool 2. The forming tool 2 comprises a first mold half 1 with a circular and cylindrical bolt 12 as the guiding body 4, and the bolt 12 serves, in particular, as the guiding post of the guiding means 7 and as the guiding post of the second mold half 5 having a bush 14 into which the rolling element cage 16 is inserted when in the open state.

[0041] The guiding groove portion 6 is configured as a bush 14 having a circular and cylindrical inner surface 20 and is fixed to the second mold half 5 of the forming tool 2 as will be described later. A rolling element cage 16 is inserted into the bush 14 supported by the circular and cylindrical inner surface 20. The rolling element cage 16 comprises rolling elements 17 arranged at row 18, and the rolling elements 17 can be configured as rollers or balls.

[0042] Positioning means 30 is provided for positioning the rolling element cage 16. According to an embodiment shown in FIG. 3, the positioning means 30 includes a retainer element 32, and the retainer element 32 is made of a circlip 34 or a snap ring and is arranged near the opening of the bush 14 toward the circular and cylindrical bolt 12. Here, the circlip 34 is inserted into a groove provided on the circular and cylindrical inner surface 20. Further, the positioning means 30 includes a spring element 31 configured to bias the rolling element cage 16 toward the retainer element 32 from its opposite end. The end of the spring element 31 facing away from the rolling element cage 16 is supported by a stop element, and this stop element is inserted into a groove provided on the circular and cylindrical inner surface 20 at the end opposite to the opening for inserting the bolt 12, or can be formed by another circlip 34 inserted into the groove or a shoulder protruding inward from the circular and cylindrical inner surface 20. The spring element 31 made of a compression spring presses the rolling element cage 16 against the retainer element 32, which means that the rolling element cage 16 is in the correct position when the forming tool 2 is open. The correct position of the rolling element cage 16 is such that when the forming tool 2 is closed, the circular and cylindrical bolt 12 runs substantially simultaneously with the first row of the rolling elements 17 and the second row of the rolling elements 17, whereby the load on the rolling elements 17 and their support surfaces can be divided, and as a result, as shown in detail in FIGS. 4a and 4b, the service life is extended.

[0043] Advantageously, the bush 14 includes a lead-in shaped entrance portion, and this portion includes an edge 21 that encompasses the circular and cylindrical inner surface 20 and provides a transition to a second circular and cylindrical inner surface 22. As a result, the point where a complete preload is applied to the rolling element 17 is accurately defined, and the rolling element 17 is gently driven through the conical retraction region 22. The circular and cylindrical bolt 12 has a lead-in shape formed on the head of the bolt 12 so that the bolt 12 can be easily inserted into the rolling element cage 16, as will be described later.

[0044] A further advantageous embodiment of the invention is that the bush 14 can be positioned relative to the second mold half 5 and the bolt 12 can be positioned relative to the first mold half 1 by means of a locking member 40 which provides individual positioning and variability of the thickness of the molding tool 2, in particular the dimensions of the plate part of the molding tool 2. The locking member 40 is formed as a ring or ring part 44 which can be inserted into a circumferential groove 41. Thereby, at least one of the bush 14 and the bolt 12 is surrounded, and a series of circumferential grooves 41 are formed along the axial length of at least one of the bush 14 and the bolt 12. The ring or ring part 44 inserted into one of the circumferential grooves 41 projects into the groove part 42 of the plate part of the molding tool 2. The groove part 42 can be formed from a shoulder between the plate parts.

[0045] As can be seen from FIG. 3, the guide body 4 can likewise be fixed to the first mold half 1 via the locking member 40. The locking member 40 is inserted into a circumferential groove 41 formed on the outer surface of the guide body 4 and projects into the groove part 42 formed in the first mold half 1 or between the plate parts forming the first mold half 1.

[0046] FIGS. 4a and 4b show a cross section and an enlarged detail of the guiding and centering device 10 when the molding tool 2 is closed. Thereby, the circular and cylindrical bolt 12 enters into a rolling element cage 16 arranged in the bush 14 via positioning means 30 formed as spring elements 31 (not shown) and retainer elements 32. The bush 14 has a circular and cylindrical inner surface 20 which is joined at the edge 21. Adjacent to the edge 21, a transition region is configured to transition from the edge 21 to a second circular and cylindrical inner surface 22 having a diameter larger than that of the circular and cylindrical inner surface 20. The transition region between the inner surfaces 20, 22 can preferably be formed with a rounding or curvature adapted to the roundness of the rolling elements 17. Further, the circular and cylindrical bolt 12 has a circular peripheral surface 52 which is fastened by an edge 51. Adjacent to the edge 51, the head of the bolt 12 is formed from a conical recessed region 50 which provides a lead-in shape.

[0047] When closing the forming die 2, the circular and cylindrical bolt 12 enters the rolling element cage 16 in a lead-in shape formed from the conical retraction region 50. As can be seen from FIG. 4a, the bolt 12 passes over the first row 18.1 of the rolling elements 17 arranged in the rolling element cage 16. This is because the rolling elements 17 of the first row 18.1 are located in the region of the second circular and cylindrical inner surface 22, particularly in the region of the edge 21, and thus are related to the bushing 14 in the retracted position. As the circular and cylindrical bolt 12 further advances, the edge 51 of the bolt 12 contacts the second row 18.2 of the rolling elements 17 arranged within the rolling element cage 16. As soon as the edge 51 of the bolt 12 passes over the rolling elements 17 of the first row 18.1, these rolling elements 17 begin to rotate, and the rolling element cage 16 is pushed into the bushing 14, moving the rolling elements 17 of the second row 18.2 as can be seen from FIG. 4b. With this arrangement, the rolling elements 17 of the first row 18.1 and the rolling elements 17 of the second row 18.2 are substantially simultaneously pre-tensioned, thereby enabling the load to be divided.

[0048] In a further closing step of the forming tool 2, the circular and cylindrical bolt 12 passes over the rolling elements 17 of a further row 18 arranged within the rolling element cage 16. In the fully closed position of the forming die 2, the circular and cylindrical bolt 12 is pushed into the rolling element cage 16, as a result of which centering forces are transmitted from the rolling elements 17 of the rolling element cage 16. By opening the forming die 2, the bolt 12 is pulled out of the bushing 14, and the rolling element cage 16 is thus arranged so that the next centering step can be carried out in an optimal manner.

[0049] In FIG. 5, the locking member 40 is shown in a perspective view. The locking member 40 is formed from two halves of a ring 44. The ring 44 provides a circumferential slot 45 into which a seal ring 46 can be inserted to hold the halves of the ring together. This arrangement allows the bush 14 to be easily placed at a predetermined position in the second type of half 5 and the bolt 12 to be easily placed at a predetermined position in the first type of half 1, respectively. Thus, the guiding and centering device 10 can be adapted to different dimensions of the plate part of the mold 2 and can provide a universally applicable guiding and centering device having optimal centering and guiding characteristics. The present application provides, for example, the following aspects. [Aspect 1] A molding tool (2), in particular a guiding and ejecting device (10) for an injection molding or die-casting tool, comprising a first-type half body (1) and a second-type half body (5), wherein guiding means (7) guide the respective parting surfaces of both types of half bodies (1, 5) from a closed position, in which they are pressed against each other, to an open position and from the open position to the closed position, and the guiding and ejecting device (10) comprises a guiding body (4) formed as a circular and cylindrical bolt (12) provided on the first-type half body (1) and protruding therefrom, a guiding groove portion (6) formed as a bush (14) and provided with a circular and cylindrical inner surface (20) on the second-type half body (5), and a rolling element cage (16) into which rolling elements (17) are inserted in a plurality of rows (18), the rolling element cage (16) guiding the two types of half bodies (1, 5) and accurately ejecting them in the closed position, characterized in that the rolling element cage (16) is supported by the circular and cylindrical inner surface (20) of the bush (14), and when closing the molding tool, the circular and cylindrical bolt (12) enters substantially simultaneously into a first row (18.1) of rolling elements and a second row (18.2) of rolling elements of the rolling element cage (16) via positioning means (30). [Aspect 2] The guiding and ejecting device (10) for a molding tool (2) according to Aspect 1, characterized in that the positioning means (30) is formed by a spring element (31) and an axial retainer element (32), and the rolling element cage (16) is axially arranged within the bush (14) therebetween. [Aspect 3] The guiding and ejecting device (10) for a molding tool (2) according to Aspect 1 or 2, characterized in that at least one groove (33) is provided at at least one end of the circular and cylindrical inner surface (20) of the bush (14), and a circlip (34) can be inserted into the groove (33) for axially arranging the positioning means (30). [Aspect 4] The guiding and ejecting device (10) for a molding tool (2) according to any one of aspects 1 to 3, characterized in that at least one shoulder is formed at at least one end portion of the circular and cylindrical inner surface (20) of the bush (14) forming the support of the positioning means (30). [Aspect 5] The connection of the bush (14) to the second mold half (5) is via a locking member (40), and the locking member (40) is surrounding the bush (14) and insertable into one of a series of circumferential grooves (41) formed along the axial length of the bush (14), projecting into a groove (42) formed in the second mold half (5) The guiding and ejecting device (10) for a molding tool (2) according to any one of aspects 1 to 4, characterized in that. [Aspect 6] The connection of the circular and cylindrical bolt (12) to the first mold half (1) is via a locking member (40), and the locking member (40) is surrounding the bolt (12) and insertable into one of a series of circumferential grooves (41) formed along the axial length of the bolt (12), projecting into a groove (42) formed in the first mold half (1) The guiding and ejecting device (10) for a molding tool (2) according to one of aspects 1 to 5, characterized in that. [Aspect 7] The guiding and ejecting device (10) for a molding tool (2) according to aspects 5 and 6, characterized in that the locking member (40) is formed from a circlip (34). [Aspect 8] The guiding and ejecting device (10) for a molding tool (2) according to aspects 5 and 6, characterized in that the locking member (40) is formed from two ring parts (44) with surrounding slots (45), and the two ring parts (44) are connected to each other via a sealing ring (46) insertable into the slot (45). [Aspect 9] The guiding and ejecting device (10) for a molding tool (2) according to any one of aspects 1 to 8, characterized in that at least one of the bush (14) and the circular and cylindrical bolt (12) is configured with a lead-in geometry. [Aspect 10] The circular and cylindrical bolt (12) has a conical drawing-in region (50) adjacent to the edge (51), and the drawing-in region (50) encloses the circular circumferential surface (52) of the bolt (12). The guiding and centering device (10) for the forming tool (2) according to any one of aspects 1 to 9, characterized in that. [Aspect 11] The circular and cylindrical inner surface (20) of the bush (14) is enclosed by an edge (21), and adjacent to the edge (21), a second circular and cylindrical inner surface (22) having a diameter larger than that of the circular and cylindrical inner surface (20) is formed. The guiding and centering device (10) for the forming tool (2) according to one of aspects 1 to 10, characterized in that. [Aspect 12] The edge (21) transitions from the circular and cylindrical inner surface (20) to the second circular and cylindrical inner surface (22) having a curvature adapted to the curvature of the rolling element (17). The guiding and centering device (10) for the forming tool (2) according to aspect 11, characterized in that. [Aspect 13] The rolling element (17) is a roller or a ball. The guiding and centering device (10) for the forming tool (2) according to any one of aspects 1 to 12, characterized in that.

Claims

1. A guiding and ejecting device (10) for a forming tool (2), comprising a first-type half body (1) and a second-type half body (5), wherein guiding means (7) guide the separating surfaces of both types of half bodies (1, 5) from a closed position where they are pressed against each other to an open position where the guiding means disengages from the engagement, and guide them from the open position to the closed position. The guiding and ejecting device (10) comprises: a guiding body (4) formed as a circular and cylindrical bolt (12) provided on the first-type half body (1) and protruding; a guiding groove portion (6) formed as a bush (14) and provided with a circular and cylindrical inner surface (20) on the second-type half body (5); a rolling element cage (16) in which a plurality of rows (18) of rolling elements (17) are inserted, and the two types of half bodies (1, 5) are guided by the rolling element cage (16) and accurately ejected to the closed position; and the rolling element cage (16) is supported by the circular and cylindrical inner surface (20) of the bush (14), and when the forming tool is closed, during at least the initial engagement, the circular and cylindrical bolt (12) enters substantially simultaneously into a first row (18.1) and a second row (18.2) of rolling elements of the rolling element cage (16) through which the circular and cylindrical bolt (12) passes at the head of the circular and cylindrical bolt (12), and is arranged via positioning means (30); and it is possible to fasten the bush (14) to the second-type half body (5) and / or the circular and cylindrical bolt (12) to the first-type half body (1) via a locking member (40). A guiding and ejecting device (10) as claimed in claim 1, characterized in that.

2. The guiding and ejecting device (10) for a forming tool (2) according to claim 1, characterized in that the positioning means (30) is formed by a spring element (31) and an axial retaining element (32), and the rolling element cage (16) is axially arranged in the bush (14) therebetween.

3. At least one groove (33) is provided in at least one end of the circular and cylindrical inner surface (20) of the bush (14), and a circlip (34) can be inserted into the groove (33) for arranging the positioning means (30) in the axial direction. The guiding and centering device (10) for the forming tool (2) according to claim 1 or 2 is characterized in that.

4. The guiding and centering device (10) for the forming tool (2) according to any one of claims 1 to 3 is characterized in that at least one shoulder is formed at at least one end portion of the circular and cylindrical inner surface (20) of the bush (14) that forms the support of the positioning means (30).

5. The locking member (40) for connecting the bush (14) to the second mold half (5) Surrounds the bush (14) and can be inserted into one of a series of circumferential grooves (41) formed along the axial length of the bush (14), And protrudes into a groove (42) formed in the second mold half (5). The guiding and centering device (10) for the forming tool (2) according to any one of claims 1 to 4 is characterized in that.

6. The locking member (40) for connecting the circular and cylindrical bolt (12) to the first mold half (1) Surrounds the bolt (12) and can be inserted into a series of circumferential grooves (41) formed along the axial length of the bolt (12), And protrudes into a groove (42) formed in the first mold half (1). The guiding and centering device (10) for the forming tool (2) according to one of claims 1 to 5 is characterized in that.

7. The guiding and centering device (10) for the forming tool (2) according to claim 5 or 6 is characterized in that the locking member (40) is formed from a circlip (34).

8. The guiding and centering device (10) for the forming tool (2) according to claim 5 or 6 is characterized in that the locking member (40) is formed from two ring parts (44) provided with a surrounding slot (45), and the two ring parts (44) are connected to each other via a sealing ring (46) that can be inserted into the slot (45).

9. The guiding and centering device (10) for a forming tool (2) according to any one of claims 1 to 8, characterized in that at least one of the bush (14) and the circular cylindrical bolt (12) is configured in a lead-in geometry.

10. The circular cylindrical bolt (12) has a conical drawing-in region (50) adjacent to the edge (51), and the drawing-in region (50) encloses the circular circumferential surface (52) of the bolt (12). The guiding and centering device (10) for a forming tool (2) according to any one of claims 1 to 9, characterized in that.

11. The circular cylindrical inner surface (20) of the bush (14) is enclosed by an edge (21), and adjacent to the edge (21), a second circular cylindrical inner surface (22) having a diameter larger than that of the circular cylindrical inner surface (20) is formed. The guiding and centering device (10) for a forming tool (2) according to one of claims 1 to 10, characterized in that.

12. The edge (21) transitions from the circular cylindrical inner surface (20) to the second circular cylindrical inner surface (22) having a curvature adapted to the curvature of the rolling element (17). The guiding and centering device (10) for a forming tool (2) according to claim 11, characterized in that.

13. The rolling element (17) is a roller or a ball. The guiding and centering device (10) for a forming tool (2) according to any one of claims 1 to 12, characterized in that.

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