CN107364086B - Forming mechanism for back-off type injection mold - Google Patents
Forming mechanism for back-off type injection mold Download PDFInfo
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- CN107364086B CN107364086B CN201710729576.5A CN201710729576A CN107364086B CN 107364086 B CN107364086 B CN 107364086B CN 201710729576 A CN201710729576 A CN 201710729576A CN 107364086 B CN107364086 B CN 107364086B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 title claims abstract description 13
- 239000007924 injection Substances 0.000 title claims abstract description 13
- 238000000465 moulding Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 15
- 238000000926 separation method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- 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
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
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- 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
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- 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
- B29C2045/445—Removing or ejecting moulded articles for undercut articles using the movable undercut forming element for ejection of the moulded article
Abstract
The invention provides a forming mechanism for an inverted buckle type injection mold, which comprises a mold core and a mold cavity matched with the mold core, wherein sliding blocks are arranged at inverted buckle parts at two sides of the mold core matched with the mold cavity, the mold core is fixed on a fixed seat, supporting blocks are arranged at two symmetrical sides of one end, close to the mold core, of a small ejector rod which is connected with an ejector rod in a sliding manner and is arranged in the mold core, a clamping block is arranged in the mold core and is hinged in a deep groove of the fixed seat through a positioning rod, a rotating block matched with the supporting blocks in a sliding manner is arranged at one end, close to the ejector rod, of the clamping block, and a spring is arranged between the rotating block and the supporting block. According to the forming mechanism for the back-off type injection mold, the back-off type core part is of a telescopic structure, and through the cooperation of the ejector rod and the sliding block, the product can be directly ejected through the straight ejection in the demolding process, the forming and ejection of a complex product are completed in the simplest form, the operation is convenient, and the cooperation relationship among the parts is compact.
Description
Technical Field
The invention belongs to the field of injection molds, and particularly relates to a forming mechanism for an inverted injection mold.
Background
Along with the development of society and the progress of technology level, automobiles become an indispensable transportation means for going out in a medium and short distance, and it is well known that in order to further lighten the overall mildness of automobiles and ensure better strength, most of related parts in automobiles are made of plastic parts through injection molding, in order to ensure smoother transition of all parts, the related parts are preferably integrally molded at one time, and most of related parts inside are in a back-off form. Aiming at the situation, the invention provides a forming mechanism for an inverted injection mold, which aims to overcome the defects of the prior art, and adopts the cooperation of double ejector rods to set an inverted mold core part into a telescopic structure, move along with the movement of the ejector rods and cooperate with external sliding blocks, so that the product can be directly ejected through a straight ejector in the demolding process, the structure is simple, the operation is convenient, the cooperation relationship among the parts is compact, the deviation is not easy to occur, the forming and ejection of a complex product are finished in the simplest form, the practicability is strong, and the cost is saved.
Disclosure of Invention
In view of the above, the invention aims to provide a molding mechanism for an inverted mold, which aims to overcome the defects of the prior art, and adopts a telescopic structure for an inverted mold core part through the cooperation of double ejector rods, along with the movement of the ejector rods, the movement of the ejector rods and the cooperation of external sliding blocks are added, so that the product can be directly ejected through a straight ejector in the demolding process, the structure is simple, the operation is convenient, the cooperation relationship among the parts is compact, the deviation is not easy to occur, the molding and ejection of a complex product are finished in the simplest form, the practicability is high, and the cost is saved.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the utility model provides a forming mechanism for back-off type injection mold, includes the core and rather than complex die cavity, the core with die cavity complex both sides back-off part is equipped with the slider, and the three is joined in marriage and is enclosed out the shape of back-off product, the core is fixed on the fixing base, the bottom of fixing base is passed through the backing plate and is connected with the base, the ejector pin passes the fixing base with the core respectively with both sliding connection, with ejector pin sliding connection just place in the little ejector pin of one end symmetry that is close to the core in be equipped with the supporting shoe, the supporting shoe stretches out ejector pin sliding connection above that, be equipped with the fixture block in the core, the fixture block passes through the locating lever and articulates in the deep groove of fixing base, the fixture block be close to the one end of ejector pin be equipped with supporting shoe sliding fit's dwang, the dwang with be equipped with the spring between the supporting shoe.
Further, the sliding block drives the push rod through the hydraulic cylinder, and then drives the sliding block connected with the push rod to move, and the hydraulic cylinder is arranged on the fixing seat.
Further, in the inclined planes of the supporting block and the rotating block, the inclined plane of the supporting block is larger than the inclined plane of the rotating block.
Further, the positioning rod is hinged in the deep groove through a pin shaft, and the axis of the pin shaft is perpendicular to the axis of the ejector rod.
Further, be equipped with the layer board on the base, the symmetry is equipped with straight ejector pin on the layer board, the both sides of base symmetry are equipped with the backing plate, the one end that the backing plate is close to each other is equipped with the recess respectively, be equipped with the slide on the recess, the slide is arranged in straight ejector pin top, be equipped with two slide mechanism in the slide, the ejector pin is arranged in on the slide, little ejector pin stretches into slide and threaded connection thereof, slide mechanism equally with little ejector pin threaded connection.
Further, the sliding mechanism comprises a fixed block, one end of the fixed block is fixedly connected with the sliding plate, the other end of the fixed block is in sliding connection with the sliding block through an inclined plane, the other end of the sliding block is connected with the sliding rod, threads are arranged on one side, close to the small ejector rod, of the other end of the sliding rod, the other end of the sliding rod is matched with the threads on the small ejector rod, the sliding rod drives the small ejector rod to vertically move through horizontal movement of the sliding rod, and the sliding rods are respectively arranged on two sides of the small ejector rod, which are symmetrical.
Further, holes are formed in the bottoms of the sliding plates, corresponding to the matching parts of the fixed blocks and the sliding blocks, the straight ejector rods extend into the holes to push the sliding blocks to horizontally move, and the length of the straight ejector rods is not greater than the distance from the supporting plates to the bottoms of the sliding plates.
Further, the upper side is equipped with in the space that the slide was equipped with the sliding block is equipped with the arc hole, the arc hole corresponds the top shape of straight ejector pin, the arc hole with straight ejector pin clearance fit.
Furthermore, an inner groove is formed in the position, corresponding to the ejector rod, of the supporting plate, the sum of the depth of the inner groove and the height of the sliding plate is larger than the thread length of the small ejector rod, and the axis of the small ejector rod is perpendicular to the sliding direction of the sliding rod.
Furthermore, a stepped hole is formed in the ejector rod, and the small ejector rod is provided with a threaded part which moves in a large hole part of the stepped hole.
Compared with the prior art, the forming mechanism for the back-off type injection mold has the following advantages:
(1) The invention relates to a forming mechanism for an inverted injection mold, which aims to overcome the defects in the prior art, and adopts the cooperation of double ejector rods to set an inverted mold core part into a telescopic structure, and then the ejector rods move along with the movement of the ejector rods, and the cooperation of external sliding blocks is added, so that a product can be directly subjected to direct ejection to finish the ejection of the inverted mold product in the ejection process, the structure is simple, the operation is convenient, the cooperation relationship among the parts is compact, deviation is not easy to occur, the forming and ejection of a complex product are finished in the simplest form, the practicability is high, and the cost is saved.
(2) The sliding block drives the push rod through the hydraulic cylinder, so that the sliding block connected with the push rod is driven to move, and the hydraulic cylinder is arranged on the fixing seat. The sliding block on the die can move back and forth through simple linear movement change so as to realize the closing or separation of the sliding block and the inner cavity, so that the die opening and the die closing of the die can be better realized, and the influence on other parts can be avoided.
(3) In the inclined planes of the supporting block and the rotating block, which are matched with each other, the inclination of the inclined plane of the supporting block is larger than that of the rotating block. The vertical ejection device has the advantages that in the vertical movement distance of the limited ejector rod, the rotation block drives the clamping block to swing at a larger angle, and the vertical ejection of the product is not affected when the product is supported and contracted during molding of the product can be better realized, so that the effect is better.
(4) The positioning rod is hinged in the deep groove through the pin shaft, and the axis of the pin shaft is perpendicular to the axis of the ejector rod. The fixture block is guaranteed to rotate in a fixed range, deformation of the mold core is achieved, the inverted buckle product is produced, the ejector rod can be guaranteed to directly eject through the change of the fixture block, and the operation is convenient.
(5) The base is provided with the supporting plate, the supporting plate is symmetrically provided with the straight ejector rods, two symmetrical sides of the base are provided with the base plates, one ends of the base plates, which are close to each other, are respectively provided with the grooves, the grooves are provided with the sliding plates, the sliding plates are arranged above the straight ejector rods, two sliding mechanisms are arranged in the sliding plates, ejector rods are arranged in the middle of the sliding plates, the ejector rods are connected with the small ejector rods in a sliding mode, the small ejector rods extend into the sliding plates to be in threaded connection with the small ejector rods, and the sliding mechanisms are also in threaded connection with the small ejector rods. The device aims to overcome the defects in the prior art, through the cooperation of the double ejector rods, the part connected with the product is partially rotated and separated in the ejection process, the smoothness of the separation surface of the product is ensured, the step-by-step separation of the ejector rods and the product is equivalent, the tearing force for separating the product is reduced, the smoothness of the surface is improved, the appearance of the product is ensured to be better, the yield of the product is improved, and the cost is saved.
(6) The sliding mechanism comprises a fixed block, one end of the fixed block is fixedly connected with the sliding plate, the other end of the fixed block is in sliding connection with the sliding block through inclined plane fit, the other end of the sliding block is connected with the sliding rod, threads are arranged on one side, close to the small ejector rod, of the other end of the sliding rod and are matched with the threads on the small ejector rod, the small ejector rod is driven to vertically move through horizontal movement of the sliding rod, and the sliding rod is respectively arranged on two symmetrical sides of the small ejector rod. The sliding mechanism is simple in structure, the sliding block is firstly moved relatively in the ejection process through the cooperation of the straight ejector rod, and then the small ejector rod matched with the sliding block is driven to move downwards, so that the top end of the small ejector rod is firstly separated from a product, the small ejector rod is simultaneously rotated through the cooperation of threads in the descending process, the pulling force is reduced, and the smoothness of a connecting part is improved.
(7) According to the invention, holes are formed at the bottoms of the sliding plates corresponding to the matching parts of the fixed block and the sliding block, and the straight ejector rod stretches into the holes to push the sliding block to horizontally move. The small ejector rod is moved firstly during die opening ejection, then the ejector rod works, smooth work of the sliding mechanism is guaranteed, and the die opening ejector is simple in structure and good in matching.
(8) The length of the straight top rod is not longer than the distance from the supporting plate to the bottom of the sliding plate. The straight ejector rod is prevented from contacting with the sliding block during mold closing, and all parts are in a relatively balanced state, so that smoothness of contact parts of the small ejector rod and the ejector rod with a product is ensured, and influence on the injection molding of the product is avoided.
(9) The sliding plate is provided with the arc-shaped hole on the upper side in the space of the sliding block, the arc-shaped hole corresponds to the top shape of the straight ejector rod, and the arc-shaped hole is in clearance fit with the straight ejector rod. The sliding plate can be pushed upwards continuously after the small ejector rod is moved, the product is ejected by the ejector rod, the stability of movement is guaranteed through the cooperation of the holes in the process, the deviation is not easy to occur, and the accuracy is high.
(10) The sum of the depth of the inner groove and the height of the sliding plate is larger than the thread length of the small ejector rod. The small ejector rod is prevented from colliding with the supporting plate in the downward movement process, the service life of the die is prolonged, and the replacement times are reduced.
(11) The ejector rod is internally provided with a stepped hole, and the small ejector rod is provided with a threaded part which moves in a large hole part of the stepped hole. And a positioning point is provided, so that the consistency of the small push rod moving upwards and the plane of the upper end part of the push rod is ensured, and the smoothness of the product is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of a part of a molding mechanism for an inverted injection mold according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a part of an ejection mechanism for an automobile back-off die according to an embodiment of the invention.
Reference numerals illustrate:
1-backing plate; 2-grooves; 3-fixing blocks; 4-well; 5-a base; 6-sliding blocks; 7-a slide bar; 8-an inner tank; 9-a straight ejector rod; 10-supporting plates; 11-arc-shaped holes; 12-a skateboard; 13-ejector rods; 14-small ejector rods; 15-step holes; 16-a fixed seat; 17-pin shafts; 18-deep groove; 19-rotating blocks; 20-springs; 21-a core; 22-back-off product; 23-cavity; 24-supporting blocks; 25-clamping blocks; 26-positioning rod; 27-a hydraulic cylinder; 28-push rod; 29-slider.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The molding mechanism for the back-off type injection mold shown in fig. 1 comprises a mold core 21 and a mold cavity 23 matched with the mold core 21, sliding blocks 29 are arranged at back-off parts at two sides matched with the mold cavity 23, the mold core 21 is fixed on a fixed seat 16 in a shape of a back-off product 22 by matching the mold core 21, the bottom of the fixed seat 16 is connected with a base 5 through a base plate 1, a push rod 13 penetrates through the fixed seat 16 and the mold core 21 to be respectively and slidably connected with the fixed seat 16 and the mold core 21, supporting blocks 24 are arranged at two symmetrical sides of one end, which is close to the mold core 21, of a small push rod 14 which is slidably connected with the push rod 13 and is arranged in the push rod 13, the supporting blocks 24 extend out of the push rod 13 to be slidably connected with the push rod 13, clamping blocks 25 are arranged in the mold core 21, the clamping blocks 25 are hinged in deep grooves 18 of the fixed seat 16 through positioning rods 26, one ends, which are close to the push rod 13, of the fixing blocks 19 are slidably matched with the supporting blocks 24, and springs 20 are arranged between the rotating blocks 19 and the supporting blocks 24. The mold core 21 is characterized in that the mold core 21 is provided with a telescopic structure, the ejector rod 13 moves along with the telescopic structure, and an external sliding block 29 is matched, so that the product can be directly ejected through a straight top in the demolding process, the mold is simple in structure and convenient to operate, the matching relationship among the parts is compact, deviation is not easy to occur, the molding and ejection of a complex product are finished in the simplest form, the practicability is high, and the cost is saved.
The sliding block 29 drives the push rod 28 through the hydraulic cylinder 27, and further drives the sliding block 29 connected with the push rod 28 to move, and the hydraulic cylinder 27 is arranged on the fixed seat 16. The sliding block 29 on the die can move back and forth through the change of simple linear motion so as to realize the closing or separating with the inner cavity, and the die opening and the die closing of the die can be better realized without affecting other parts.
Wherein, in the inclined planes of the supporting block 24 and the rotating block 19 which are matched with each other, the inclination of the inclined plane of the supporting block 24 is larger than that of the rotating block 19. The rotary block 19 drives the clamping block 25 to swing at a larger angle in the limited vertical moving distance of the ejector rod 13, so that the vertical ejection of the product is not influenced when the product is supported and contracted during product forming can be better realized, and the effect is better.
Wherein, the locating rod 26 is hinged in the deep groove 18 through a pin shaft 17, and the axis of the pin shaft 17 is perpendicular to the axis of the ejector rod 13. The fixture block 25 is guaranteed to rotate within a fixed range, deformation of the mold core 21 is achieved, a back-off product is produced, the change of the fixture block can guarantee that the ejector rod 13 can be ejected directly, and the operation is convenient.
The base 5 is provided with a supporting plate 10, the supporting plate 10 is symmetrically provided with straight ejector rods 9, two sides of the base 5 are provided with base plates 1, one ends of the base plates 1, which are close to each other, are respectively provided with grooves 2, the grooves 2 are provided with sliding plates 12, the sliding plates 12 are arranged above the straight ejector rods 9, two sliding mechanisms are arranged in the sliding plates 12, an ejector rod 13 is arranged in the middle of the sliding plates 12, small ejector rods 14 are connected in a sliding mode in the ejector rods 13, the small ejector rods 14 extend into the sliding plates 12 to be in threaded connection with the small ejector rods 14, and the sliding mechanisms are also in threaded connection with the small ejector rods 14. The device aims to overcome the defects in the prior art, through the cooperation of the double ejector rods, the part connected with the product is partially rotated and separated in the ejection process, the smooth separation surface of the product is ensured, the step-by-step separation of the ejector rods 13 and the product is equivalent, the tearing force for separating the product is reduced, the smoothness of the surface is improved, the good product appearance is ensured, the yield of the product is improved, and the cost is saved.
The sliding mechanism comprises a fixed block 3, one end of the fixed block 3 is fixedly connected with a sliding plate 12, the other end of the fixed block is in sliding connection with a sliding block 6 through inclined plane fit, the other end of the sliding block 6 is connected with a sliding rod 7, threads are arranged on one side, close to the small ejector rod 14, of the other end of the sliding rod 7, the other end of the sliding rod 7 is matched with the threads on the small ejector rod 14, the sliding rod 7 drives the small ejector rod 14 to vertically move through horizontal movement of the sliding rod 7, and the sliding rods 7 are respectively arranged on two symmetrical sides of the small ejector rod 14. The sliding mechanism is simple in structure, the sliding block 6 is firstly relatively moved in the ejection process through the cooperation of the straight ejector rod 9, and then the small ejector rod 14 matched with the sliding block is driven to move downwards, so that the top end of the small ejector rod 14 is firstly separated from a product, the small ejector rod 14 is simultaneously rotated through the cooperation of threads in the descending process, the pulling force is reduced, and the smoothness of a connecting part is improved.
Wherein, the bottom of the sliding plate 12 corresponding to the matching part of the fixed block 3 and the sliding block 6 is provided with a hole 4, and the straight ejector rod 9 stretches into the hole 4 to push the sliding block 6 to move horizontally. The small ejector rod 14 is moved firstly during die opening ejection, then the ejector rod 13 works, smooth operation of the sliding mechanism is guaranteed, and the die opening ejector is simple in structure and good in matching.
Wherein the length of the straight ejector rod 9 is not greater than the distance from the supporting plate 10 to the bottom of the sliding plate 12. The straight ejector rod is prevented from contacting with the sliding block during mold closing, and all parts are in a relatively balanced state, so that smoothness of contact parts of the small ejector rod 14 and the ejector rod 13 with products is ensured, and influence on the products during injection molding is avoided.
The sliding plate 12 is provided with an arc-shaped hole 11 at the upper side in the space of the sliding block 6, the arc-shaped hole 11 corresponds to the top shape of the straight ejector rod 9, and the arc-shaped hole 11 is in clearance fit with the straight ejector rod 9. The small ejector rod 14 can be guaranteed to continuously push the sliding plate 12 to move upwards after the movement is finished, the product is ejected out by the ejector rod 13, the stability of the movement is guaranteed through the cooperation of the holes 4 in the process, the deviation is not easy to occur, and the accuracy is high.
Wherein, the position of the supporting plate 10 corresponding to the ejector rod 13 is provided with an inner groove 8.
Wherein the sum of the depth of the inner groove 8 and the height of the sliding plate 12 is larger than the thread length of the small ejector rod 14. The small ejector rod 14 is prevented from colliding with the supporting plate 10 in the downward movement process, the service life of the die is prolonged, and the replacement times are reduced.
Wherein the axis of the small ejector rod 14 is perpendicular to the sliding direction of the sliding rod 7.
Wherein, a stepped hole 15 is arranged in the ejector rod 13, and a threaded part on the small ejector rod 14 moves in a large hole part of the stepped hole 15. A positioning point is provided, the consistency of the small push rod 14 moving upwards and the plane of the upper end part of the push rod 13 is ensured, and the smoothness of the product is improved.
The working principle of the invention is as follows: as shown in figure 1, in the mold closing state, when the mold is closed, the supporting plate 10 is at the lowest position, the heads of the ejector rod 13 and the small ejector rod 14 are in the same plane, the spring 20 is in a stretching state, in the state, the supporting block 24 and the rotating block 19 are mutually far away, the clamping block 25 is in a mutually far away state, the clamping block 25 supports the mold core 21 to form an arc shape with a contracted mouth part, at the moment, the mold core 21, the mold cavity 23 and the sliding block 29 are matched to form an inner cavity of a product in a reverse buckling mode, after the mold is closed, molten plastic is injected into the mold core through an injection molding machine, after the mold is cooled, the mold core 21 is easily wrapped due to the heat expansion and cold contraction property of the mold core, the mold core is not convenient to take out, when the mold is opened, along with the rising of the upper movable mold, the outer lifting rod stretches into the mold through the base 5 to rise, and provides rising force for the mold support plate 10, the straight ejector rod 9 on the supporting plate 10 moves to push the fixed block 3 and the sliding block 6 away from each other along with the movement of the sliding rod 12 connected with the sliding block 6, the threads on the sliding rod 12 drive the threads on the small ejector rod 14 to rotate with each other, the small ejector rod 14 moves downwards along with the spiral, the small ejector rod 14 is partially separated from the plane part of the product under the rotating force and the downward acting force, the separation is smooth, the supporting block 24 and the rotating block 19 on the small ejector rod 14 are also mutually close along with the downward movement of the small ejector rod 14, the clamping blocks 25 are mutually close along with each other under the rebound action of the force of the spring 20, the core 21 of the back-off part is further pulled away, the vertical movement of the product is not influenced, the small ejector rod 14 is lowered to the lowest, the ejector rod 13 starts to move upwards integrally, the product is ejected out, the part connected with the product is less, and no back-off part is covered on the core 21, can vertically eject, and after ejection, the product is easily taken down from the ejector rod 14 by the external claw, and multiple demolding is not needed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The utility model provides a forming mechanism for back-off formula injection mold which characterized in that: the mold comprises a mold core (21) and a mold cavity (23) matched with the mold core (21), sliding blocks (29) are arranged on two sides of the mold core (21) matched with the mold cavity (23), the mold core (21) is matched with the mold core to enclose the shape of a back-off product (22), the mold core (21) is fixed on a fixed seat (16), the bottom of the fixed seat (16) is connected with a base (5) through a base plate (1), a push rod (13) penetrates through the fixed seat (16) and the mold core (21) to be respectively and slidably connected with the fixed seat (16) and the mold core (21), small push rods (14) which are slidably connected with the push rod (13) and are arranged in the push rod are arranged on two sides which are symmetrical to one end of the mold core (21), the supporting blocks (24) extend out of the push rod (13) to be slidably connected with the push rod, clamping blocks (25) are arranged in the mold core (21), the clamping blocks (25) are hinged in a deep groove (18) of the fixed seat (16) through positioning rods (26), one end, which is close to the push rod (13), and a spring (19) is arranged between the supporting blocks (19).
The base is provided with a supporting plate (10), the supporting plate (10) is symmetrically provided with straight ejector rods (9), two symmetrical sides of the base (5) are provided with base plates (1), one ends of the base plates (1) close to each other are respectively provided with grooves (2), the grooves (2) are provided with sliding plates (12), the sliding plates (12) are arranged above the straight ejector rods (9), two sliding mechanisms are arranged in the sliding plates (12), the ejector rods are arranged on the sliding plates (12), the small ejector rods (14) extend into the sliding plates (12) to be in threaded connection with the sliding plates, and the sliding mechanisms are also in threaded connection with the small ejector rods (14);
the sliding mechanism comprises a fixed block (3), one end of the fixed block (3) is fixedly connected with the sliding plate (12), the other end of the fixed block is in sliding connection with the sliding block (6) through inclined plane fit, the other end of the sliding block (6) is connected with the sliding rod (7), threads are arranged on one side, close to the small ejector rod (14), of the other end of the sliding rod (7) and are matched with the threads on the small ejector rod (14), the small ejector rod (14) is driven to vertically move through horizontal movement of the sliding rod (7), and the sliding rods (7) are respectively arranged on two symmetrical sides of the small ejector rod (14);
the bottom of the sliding plate (12) corresponding to the matching part of the fixed block (3) and the sliding block (6) is provided with a hole (4), the straight ejector rod (9) stretches into the hole (4) to push the sliding block (6) to horizontally move, and the length of the straight ejector rod (9) is not longer than the distance from the supporting plate (10) to the bottom of the sliding plate (12);
the small ejector rod (14) is provided with a threaded part which moves in a large hole part of the stepped hole (15).
2. The molding mechanism for an inverted mold according to claim 1, wherein: the sliding block (29) drives the push rod (28) through the hydraulic cylinder (27), and then drives the sliding block (29) connected with the push rod (28) to move, and the hydraulic cylinder (27) is arranged on the fixing seat (16).
3. The molding mechanism for an inverted mold according to claim 2, wherein: in the inclined planes of the supporting block (24) and the rotating block (19) which are matched with each other, the inclination of the inclined plane of the supporting block (24) is larger than that of the rotating block (19).
4. The molding mechanism for an inverted mold according to claim 3, wherein: the positioning rod (26) is hinged in the deep groove (18) through a pin shaft (17), and the axis of the pin shaft (17) is perpendicular to the axis of the ejector rod (13).
5. The molding mechanism for an inverted mold according to claim 1, wherein: the sliding plate (12) is provided with an arc hole (11) at the upper side in the space of the sliding block (6), the arc hole (11) corresponds to the top shape of the straight ejector rod (9), and the arc hole (11) is in clearance fit with the straight ejector rod (9).
6. The molding mechanism for an inverted mold according to claim 5, wherein: an inner groove 8 is formed in the position, corresponding to the ejector rod (13), of the supporting plate (10), and the sum of the depth of the inner groove (8) and the height of the sliding plate (12) is larger than the thread length of the small ejector rod (14).
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| CN201710729576.5A CN107364086B (en) | 2017-08-22 | 2017-08-22 | Forming mechanism for back-off type injection mold |
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| CN107364086A (en) | 2017-11-21 |
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