CN115366347A - Secondary ejection demolding mold and demolding resetting method - Google Patents
Secondary ejection demolding mold and demolding resetting method Download PDFInfo
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- CN115366347A CN115366347A CN202211160639.7A CN202211160639A CN115366347A CN 115366347 A CN115366347 A CN 115366347A CN 202211160639 A CN202211160639 A CN 202211160639A CN 115366347 A CN115366347 A CN 115366347A
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- thimble
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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
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
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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
- B29C45/2602—Mould construction elements
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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
- B29C2045/4084—Progressive ejection
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
本发明涉及模具技术领域，公开了一种二次顶出脱模模具及脱模复位方法，包括模具型芯、顶针面板、顶针底板、第一顶针、第二顶针、油缸驱动系统和机械扣机结构；油缸驱动系统连接模具型芯和顶针面板；机械扣机结构包括：拉钩件，设置在顶针底板的侧端，拉钩件的上端具有伸出至顶针底板的上端以上的钩部；活动弹块，设置在顶针面板的侧端，与拉钩件的钩部相分离或相扣合，以实现顶针面板和顶针底板的分离或连接；以及脱钩件，设置在模具型芯的侧端，脱钩件的下端具有伸出至模具型芯的下端以下的反推部，反推部与活动弹块相分离或相推顶配合。本发简化了模具结构，节省了油缸的使用量，缩小了模具尺寸，降低了模具成本。
The invention relates to the technical field of moulds, and discloses a demoulding mold for secondary ejection and a demoulding reset method, including a mold core, a thimble panel, a thimble bottom plate, a first thimble, a second thimble, an oil cylinder drive system and a mechanical buckle Structure; the cylinder driving system connects the mold core and the thimble panel; the mechanical buckle structure includes: a hook part, which is arranged on the side end of the thimble bottom plate, and the upper end of the hook part has a hook extending above the upper end of the thimble bottom plate; the movable spring block , set on the side end of the thimble panel, separated from or fastened with the hook part of the pull hook, so as to realize the separation or connection of the thimble panel and the thimble bottom plate; The lower end has a reverse thrust part protruding below the lower end of the mold core, and the reverse thrust part is separated from the movable spring block or pushes and cooperates with each other. The invention simplifies the structure of the mold, saves the usage of the oil cylinder, reduces the size of the mold and reduces the cost of the mold.
Description
Technical Field
The invention relates to the technical field of dies, in particular to a secondary ejection demolding die and a demolding resetting method.
Background
After the existing plastic product is injection molded in an injection mold, the product needs to be ejected out of a mold core of the mold by using an ejection mechanism of the mold so as to realize demolding. However, due to different functional definitions, some special structural features are required at local positions of the plastic product, for example, the raised ribs or deep grooves are arranged, so that when a mold is designed, a secondary ejection structure is required, that is, after the product is subjected to injection molding, most features of the plastic product are ejected by using the primary ejection structure, but the special structures including the raised ribs are still not completely separated from the core, and the remaining special structural features are ejected by using the secondary ejection structure, so that the plastic product is subjected to demolding.
At present, a commonly used ejection structure is a hydraulic oil cylinder, and in order to realize secondary ejection and demolding of a product, at least two groups of hydraulic oil cylinders are required to be arranged at different positions of a mold, wherein one group of hydraulic oil cylinders is used for performing primary ejection, and the other group of hydraulic oil cylinders is used for performing secondary ejection. The die for realizing secondary ejection and demolding by multiple groups of hydraulic cylinders at least has the following problems: the secondary ejection adopts different hydraulic oil cylinders respectively, and relates to the power transmission of an oil supply system of an injection molding machine, the time connection between the primary ejection and the secondary ejection and the like, so that the action cycle period is relatively long in the whole production process, and the injection molding production cost is influenced.
Disclosure of Invention
The invention provides a secondary ejection demoulding mould and a demoulding resetting method, which are used for solving the technical problems of long action cycle period and poor continuity of the secondary ejection demoulding of the existing mould by respectively adopting two groups of oil cylinders.
In a first aspect, the invention provides a secondary ejection demolding mold, which comprises a mold base, a support pillar fixed on the mold base, a mold core arranged at the upper end of the support pillar, a thimble panel and a thimble bottom plate, wherein the thimble panel and the thimble bottom plate are sequentially stacked and movably sleeved on the support pillar from top to bottom; the mechanical button machine structure includes:
the pull hook piece is arranged at the side end of the thimble base plate, and the upper end of the pull hook piece is provided with a hook part extending out of the upper end of the thimble base plate;
the movable elastic block is arranged at the side end of the ejector pin panel and is separated from or buckled with the hook part of the pull hook piece so as to realize the separation or connection of the ejector pin panel and the ejector pin bottom plate; and
the lower end of the disengaging piece is provided with a reverse pushing part which extends to the lower part of the mold core, and the reverse pushing part is separated from or matched with the movable elastic block in a pushing and ejecting mode.
The oil cylinder driving system is used for driving the ejector pin panel to be close to the mold core, so that the reverse pushing part pushes the movable elastic block, and the movable elastic block is separated from the hook part of the pulling hook part; the oil cylinder driving system is also used for driving the ejector pin panel to be away from the mold core, so that the reverse pushing part releases the ejection of the movable elastic block, and the movable elastic block automatically resets and is buckled with the hook part.
In one embodiment, the unhooking member is disposed above the hooking member, and a lower end of the reverse-pushing portion is provided with an open groove for receiving the hooking member.
In one embodiment, the movable elastic block comprises a movable block and an elastic piece which are connected, the inner end of the movable block is connected with the ejector pin panel through the elastic piece, and the outer end of the movable block is opposite to the pulling hook piece or the unhooking piece.
In one embodiment, a first edge of the outer end of the movable block, which is intersected with the upper end of the movable block, is provided with an inclined first chamfer surface; and a second inclined chamfer surface is arranged on a second edge, which is intersected with the lower end of the unhooking element and the inner end of the unhooking element opposite to the movable block, and the second chamfer surface is in pushing fit with the first chamfer surface.
In one embodiment, the inner end of the release hook member is also in pushing engagement with the outer end of the movable block.
In one embodiment, the hook is inverted on the upper end of the movable block.
In one embodiment, the cylinder driving system comprises a cylinder body and a piston rod, the cylinder body is fixedly arranged at the side end of the mold core, one end of the piston rod is connected with the cylinder body, and the other end of the piston rod is fixedly connected with the ejector pin panel.
In one embodiment, a fixing plate is fixedly arranged at the upper end of the ejector pin panel, a limiting block is arranged at the upper end of the fixing plate, and the first ejector pin and the second ejector pin penetrate through the fixing plate respectively.
In one embodiment, the upper end of the first thimble is further provided with a top block, and the upper end of the top block is provided with a convex part or a concave part.
In a second aspect, the present invention also provides a method for resetting a double-ejection demolding mold according to any one of the above embodiments,
driving the ejector pin panel to be close to the mold core by using an oil cylinder driving system of the secondary ejection demolding mold, so that the first ejector pin and the second ejector pin are ejected synchronously, and the primary ejection of the mold is completed;
the ejector pin panel is driven to be continuously close to the mold core by the oil cylinder driving system, the movable elastic block is pushed by the reverse pushing part of the unhooking part, the movable elastic block is separated from the hook part of the pulling and hooking part, the ejector pin panel is separated from the ejector pin bottom plate, the second ejector pin is continuously ejected, and secondary ejection of the mold is completed;
the oil cylinder driving system is used for driving the ejector pin panel to be away from the mold core, the reverse pushing portion is enabled to release the ejection of the movable elastic block, the movable elastic block is automatically reset and buckled with the hook portion, the ejector pin panel is enabled to be abutted against the ejector pin bottom plate, the ejector pin bottom plate is abutted against the mold base, and the mold resetting is completed.
The technical scheme provided by the invention has the beneficial effects that:
1. through the matching of the oil cylinder driving system and the mechanical fastener structure, the two-stage ejection action of the injection molding product is realized, and compared with the ejection structure formed by two groups of hydraulic oil cylinders, the two-stage ejection structure has the advantages that the mold structure is simplified, the using amount of the oil cylinders is saved, the mold size is reduced, and the mold cost is reduced.
2. Because only one set of hydraulic drive system is arranged, the oil circuit supply is simple, the oil cylinder drive system can realize secondary ejection by controlling the oil inlet and outlet of the oil cylinder body, and the limitation to a production machine table is small.
3. Because the ejection structure formed by two groups of hydraulic oil cylinders is replaced by one set of hydraulic driving system and mechanical fastener structure, the secondary ejection action time and the action cycle period are shortened, the consistency of the secondary ejection action is good, the ejection is smooth, the production period of the product is shortened, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a plastic product after injection molding in an injection mold.
Fig. 2 is a schematic structural view of a conventional two-stage ejection die.
Fig. 3 is a schematic structural view of the double-ejection demolding mold of the invention.
Fig. 4 is a perspective view of the release hook of fig. 3.
Fig. 5 is a schematic perspective view of the movable block in fig. 3.
Fig. 6 is a perspective view of the hook member of fig. 3.
Fig. 7 is a schematic diagram of the double ejection demolding mold of fig. 3 completing one/one-stage ejection.
Fig. 8 is a schematic view of the die of fig. 7 performing two-shot/two-stage ejection.
Fig. 9 is a schematic structural view of the mold in fig. 8 starting to reset.
Fig. 10 is a schematic diagram of the mold of fig. 9 after a reset is completed and at the beginning of a second reset.
In the figure: 1/1' -die holder; 2/2' -support column; 3/3' -mold cores; 4/4' -thimble panel; 5/5' -thimble base plate; 6/6' -the first thimble; 7/7' -a second thimble; 8, fixing a plate; 9-a limiting block; 10-a top block; 11' -a hydraulic ram;
20-a cylinder driving system; 21-an oil cylinder body; 22-a piston rod;
30-mechanical fastener structure;
31-a hook member; 311-a hook part; 3111-edge a; 3112-edge b;
32-a movable bullet; 321-a movable block; 3211-a first edge; 3212-first chamfer face; 3213-edge c; 322-a spring; 323-connecting screws;
33-a delinking element; 331-open slots; 332-a second chamfer;
40-products.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Before the technical solution of the present invention is described in this embodiment, the prior art is explained first:
the plastic product to which the mold of the invention is applicable is shown in fig. 1, and fig. 1 shows the local characteristics of a certain plastic product after injection molding in an injection mold. The area indicated by aa in fig. 1 is a raised rib. The raised ribs are the special structural features of the local position of the plastic product described in the background of the invention. Due to the existence of the raised ribs, after the plastic product is subjected to injection molding, secondary ejection and demolding are required. After the injection molding of the product is completed, most characteristics of the product are ejected out by the first-stage ejection structure, but the raised ribs are still adhered to the first-stage ejection structure, the plastic product is not completely separated, the product cannot be directly taken out at the moment, and a second-stage ejection mechanism is needed to separate the raised ribs from the mold. It should be noted that the meaning of the secondary ejection mold/mechanism/structure is the same as that of the secondary ejection mold/mechanism/structure.
To facilitate the reader's understanding of the subsequent technical solutions, the following explanations of the related terms are provided:
demolding: in the plastic product industry, after the product is subjected to injection molding, the product needs to be separated from a mold structure by an ejection mechanism, so that the product is grabbed, and the product demolding is called.
Resetting: in the product demoulding process, the process that the ejection mechanism is recovered to the production working state from the ejection state is called resetting.
Fig. 2 illustrates the structure of a conventional two-stage ejection die of the related art. As shown in fig. 2, the conventional two-stage ejection mold includes a mold base, an ejector pin base plate, an ejector pin panel, and a mold core, which are sequentially disposed from bottom to top, wherein a support pillar is fixedly disposed on the mold base. The support column is vertically arranged. The supporting column penetrates through the thimble base plate and the thimble panel, so that the thimble base plate and the thimble panel can be vertically lifted along the length direction of the supporting column. The ejector pin bottom plate is connected with a first ejector pin, the first ejector pin further penetrates through the ejector pin panel, the ejector pin panel can vertically lift along the length direction of the first ejector pin, a second ejector pin is arranged on the ejector pin panel, and the first ejector pin and the second ejector pin are both used for ejecting a product located at the upper end of the mold core. Wherein, first thimble, second thimble, support column all are parallel. The two-stage ejection die further comprises two groups of hydraulic oil cylinders, each hydraulic oil cylinder comprises an oil cylinder body and a piston rod, and the piston rods are located at the lower end of the oil cylinder body. One set of hydraulic rams is located on the left side of the mold core shown in figure 2 and the other set of hydraulic rams is located on the right side of the mold core shown in figure 2. The oil cylinder body of a group of hydraulic oil cylinders positioned on the left side of the mold core is fixedly connected with the mold core, and the lower end of the piston rod is fixedly connected with the ejector pin panel, so that the group of hydraulic oil cylinders are used for driving the ejector pin panel to lift and correspondingly realize the lifting and descending of a second ejector pin on the ejector pin panel. The oil cylinder bodies of a group of hydraulic oil cylinders positioned on the right side of the mold core are fixedly connected with the mold core, and the lower ends of the piston rods are fixedly connected with the thimble base plates to correspondingly realize the jacking and descending of the first thimbles of the thimble base plates.
Obviously, the existing conventional two-stage ejection die has the problem that two groups of hydraulic cylinders need to be matched with each other for use, so that the first ejector pin and the second ejector pin can eject a product once and the second ejector pin can eject the product twice.
The problems existing in the prior art are as follows: the tool has high cost, large size of the die, long action cycle period and limitation on production equipment. The concrete expression is as follows: the primary ejection and the secondary ejection of the die both need hydraulic oil cylinders, but two groups of eight hydraulic oil cylinders are generally needed, so that the cost is high. And these hydraulic cylinder need set up in four bights of mould, if consider that hydraulic cylinder's installation, arrangement do not exceed the mould maximum profile, will increase the mould size, increased demands such as production board, mould parking space, further increased recessive cost. In addition, secondary ejection also needs a hydraulic oil cylinder to realize, the requirement on the output power of an oil supply system of the injection molding machine table is high, the connection between the primary ejection and the secondary ejection is not smooth, the waiting time is long, the action cycle period is relatively long, the production period of a product is prolonged, the production efficiency is reduced, and the cost is also increased. Moreover, because two sets of hydraulic cylinders are required, the mold structure cannot be produced for some machines which can only provide one set of oil output. And two sets of oil circuit outputs, also relatively great to the power and the energy consumption of board.
Fig. 3 shows a secondary ejection demolding mold provided by the invention, which includes a mold base 1, a support pillar 2 fixed on the mold base 1, a mold core 3 arranged at the upper end of the support pillar 2, and a thimble panel 4 and a thimble base plate 5 which are sequentially stacked and movably sleeved on the support pillar 2 from top to bottom, wherein a first thimble 6 sequentially passing through the thimble panel 4 and the mold core 3 from bottom to top is fixedly connected to the thimble base plate 5, and a second thimble 7 passing through the mold core 3 is fixedly connected to the thimble panel 4, and further includes an oil cylinder driving system and a mechanical fastener structure. The oil cylinder driving system is connected with the mould core 3 and the ejector pin panel 4.
The mechanical button machine structure includes: a hook piece 31, a movable elastic block 32 and a hook releasing piece 33. Wherein,
the pull hook 31 is arranged at the side end of the thimble base plate 5, and the movable elastic block 32 is arranged at the side end of the thimble panel 4. The release hook member 33 is provided at a side end of the mold core 3.
As shown in fig. 4-6, the upper end of the pulling hook 31 has a hook 311 extending above the upper end of the thimble base plate 5; the movable elastic block 32 is separated from or buckled with the hook part 311 of the hook part 31, so as to separate or connect the thimble panel 4 and the thimble bottom plate 5; the lower end of the release hook member 33 has a reverse-push portion that protrudes below the lower end of the mold core 3, the reverse-push portion being separated from or in abutting engagement with the movable spring piece 32.
The oil cylinder driving system is used for driving the ejector pin panel 4 to approach the mold core 3, so that the reverse pushing part pushes the movable elastic block 32, and the movable elastic block 32 is separated from the hook part 311 of the hook part 31; the oil cylinder driving system is further used for driving the ejector pin panel 4 to be away from the mold core 3, so that the reverse pushing part releases the pushing of the movable elastic block 32, and the movable elastic block 32 automatically resets and is buckled with the hook part 311.
Wherein the hook releasing member 33 is disposed above the hook drawing member 31, and a lower end of the backward pushing portion is provided with an open groove 331 for receiving the hook drawing member 31. The opening groove 331 is located above the hook member 31, and the width of the opening groove 331 is greater than the width of the hook 311 at the upper end of the hook member 31, so that the opening groove 331 can at least accommodate the hook 311.
The upper part of the unhooking part 33 and the lower part of the draw hook part 31 are respectively in mushroom head structure, the upper end of the unhooking part 33 is connected with the mould core 3 through a screw, and the lower end of the draw hook part 31 is connected with the thimble base plate 5 through a screw.
The movable elastic block 32 comprises a movable block 321 and an elastic piece which are connected, the inner end of the movable block 321 is connected with the thimble panel 4 through the elastic piece, and the outer end of the movable block 321 is over against the pull hook piece 31 or the unhooking piece 33.
In some embodiments, the elastic member includes a spring 322 and a coupling screw 323. The side end of the thimble panel 4 is provided with a horizontal counter bore, a horizontal connecting screw 323 is arranged in the counter bore, a spring 322 and a movable block 321 are sleeved on the connecting screw 323, the spring 322 is positioned between the inner end of the counter bore and the movable block 321, wherein a horizontal step hole is arranged in the movable block 321, the aperture of the small end section of the step hole, which is over against the spring 322, is smaller than the large end section of the movable block 321, which is back to the spring 322, the nut part of the connecting screw 323 is positioned in the large end section, the nut part of the connecting screw 323 plays a role in limiting the horizontal displacement of the movable block 321, the connecting screw 323 is screwed or unscrewed, the extrusion degree of the movable block 321 to the spring 322 can be adjusted, and the position of the movable block 321 can also be adjusted.
When the spring 322 is in a natural state, the nut of the connecting screw 323 does not extend out of the counterbore, a portion of the movable block 321 near the outer end thereof extends out of the counterbore, and the movable block 321 extending out of the counterbore is engaged with the hook portion 311 of the hook member 31, so that the thimble panel 4 is connected with the thimble base plate 5 and can be lifted and lowered synchronously. When the spring 322 is horizontally compressed, the movable block 321 completely extends into the counterbore, so as to be separated from the hook portion 311 of the hook pulling element 31, the ejector pin panel 4 is separated from the ejector pin bottom plate 5, and the oil cylinder driving system can independently drive the ejector pin panel 4 to lift, so that the secondary ejection of the second ejector pin 7 is realized.
One of the problems to be solved is how to drive the spring 322 to move horizontally to realize the compression and the reset, and the other is how to drive the spring 322 to move horizontally under which state of the mold, so that the mold realizes consistent and efficient secondary ejection and demolding under a set of oil cylinder driving system.
For the sake of understanding, we will first define the end surfaces of the hooking piece 31, the movable block 321 and the unhooking piece 33. Taking fig. 3 as an example, the hook pulling element 31, the movable block 321 and the hook releasing element 33 are arranged on the right side of the mold, and the right end of the movable block 321, i.e. the end surface which can extend into or out of the counter bore, is taken as the outer end of the movable block 321, whereas the end surface of the movable block 321 opposite to the spring 322 is taken as the inner end of the movable block 321. Correspondingly, the end face of the hook 31 facing the movable block 321/the ejector pin bottom plate 5 is regarded as the inner end of the hook 31, and the end face of the hook facing away from the movable block 321 or the upright end face of the ejector pin bottom plate 5 is regarded as the outer end of the hook 31. The end surface of the hook 33 facing the needle panel 4 and standing up is regarded as the inner end of the hook 33, and the end surface of the hook 33 facing away from the needle panel 4 and standing up is regarded as the outer end of the hook 33. The open groove 331 may be actually considered to be provided at the inner end of the hook member 33 and extend to communicate with the lower end of the hook member 33.
A first edge 3211, where the outer end of the movable block 321 intersects with the upper end thereof, is provided with a first inclined chamfered surface 3212; a second edge, where the lower end of the disengaging hook 33 intersects with the inner end of the disengaging hook, is provided with a second inclined chamfered surface 332, and the second chamfered surface 332 is in pushing fit with the first chamfered surface 3212.
In some embodiments, the second edge passes through the opening 331 of the release hook 33, and a second chamfer surface 332 is respectively disposed on both sides of the opening 331. Correspondingly, the first edge 3211 of the movable block 321 is also provided with two first chamfer surfaces 3212 at intervals along the length direction of the first edge 3211, and the two first chamfer surfaces 3212 are matched with the two second chamfer surfaces 332 in a one-to-one correspondence manner. The first chamfered surface 3212 and the second chamfered surface 332 are preferably chamfered at an angle of 45 °, but may have other angles or may have rounded corners. And the width of the area between the two first chamfer surfaces 3212 of the first edge 3211 of the movable block 321 is less than or equal to the width of the opening groove 331 of the hook releasing member 33, so that when the first chamfer surface 3212 and the second chamfer surface 332 are matched, the area can be accommodated in the opening groove 331.
When the unhooking element 33 and the movable block 321 move towards each other, that is, move close to each other, the second chamfer surface 332 cooperates with the first chamfer surface 3212, and as the unhooking element 33 continuously applies an ejecting force to the movable block 321, the movable block 321 is horizontally moved towards the inner side of the counterbore by the horizontal component of the ejecting force, and presses the spring 322 until the outer end of the movable block 321 is contracted into the counterbore, the movable block 321 is separated from the hook portion 311 of the hook member 31, the unhooking element 33 and the movable block 321 continue to move towards each other, and at this time, the outer end of the movable block 321 abuts against the inner end of the unhooking element 33, or at this time, the inner end of the unhooking element 33 and the outer end of the movable block 321 are in ejecting cooperation, so that the movable block 321 continuously keeps pressed state, and the spring 322 is in a compressed state. The hook 31 enters the opening groove 331 of the hook-releasing member 33, so as to restrict the following upward pushing of the hook 31, and separate the ejector pin panel 4 from the ejector pin base plate 5. Although the ejector pin panel 4 and the ejector pin base plate 5 can be separated after the movable block 321 is separated from the hook member 31, the hook releasing member 33 limits the hook member 31 in the opening groove 331 and limits the lifting stroke thereof, and can further ensure that the ejector pin panel 4 and the ejector pin base plate 5 are separated.
The hook 311 is reversely buckled at the upper end of the movable block 321. Namely, the hook part 311 is hooked on the upper end of the movable block 321, and the other structure of the hook pulling member 31 outside the hook part 311 is arranged below the movable block 321 to avoid affecting the stroke of the movable block 321. When the hook 311 engages with the movable block 321, the lower end of the hook 311 overlaps the upper end of the movable block 321.
The hook 311 and the movable block 321 are different mating surfaces when they are engaged and disengaged, and the different mating surfaces are chamfered. For example, a 45 degree chamfer or other chamfer angle may be used, or a rounded corner may be provided. According to the action of buckling and separating, the matching surfaces are divided into two groups, when the hook part 311 and the movable block 321 are changed from the buckling state to the separating state, the edge a3111 at the lower end of the hook part 311 is matched with the first edge 3211 of the movable block 321, and the two edges are both subjected to chamfering treatment to form a group of two matching surfaces. When the hook 311 and the movable block 321 are changed from the separated state to the buckled state, the edge b3112 intersecting the upper end of the hook 311 and the inner end thereof is matched with the edge c3213 intersecting the outer end of the movable block 321 and the lower end thereof, and the edge b3112 and the edge c3213 are respectively chamfered to form another set of matching surfaces.
The oil cylinder driving system comprises an oil cylinder body 21 and a piston rod 22, wherein the oil cylinder body 21 is fixedly arranged at the side end of the mold core 3, one end of the piston rod 22 is connected with the oil cylinder body 21, and the other end of the piston rod 22 is fixedly connected with the ejector pin panel 4.
Two oil inlet and outlet ports are arranged in the oil cylinder body 21 along the height direction of the oil cylinder body at intervals, a piston of the piston rod 22 is positioned between the two oil inlet and outlet ports, when oil is fed into the lower oil inlet and outlet port, the piston rod 22 is lifted, and the upper oil inlet and outlet port is used for oil outlet; conversely, when oil is fed from the upper oil inlet and outlet, the piston rod 22 descends, and oil is discharged from the lower oil inlet and outlet.
In some embodiment modes, the upper end of the ejector pin panel 4 is further fixedly provided with a fixing plate 8, the upper end of the fixing plate 8 is provided with a limiting block 9, and the first ejector pin 6 and the second ejector pin 7 respectively penetrate through the fixing plate 8. The limiting block 9 can limit the jacking stroke of the ejector pin panel 4, the fixing plate 8 is connected with the ejector pin panel 4 through screws, and the fixing plate 8 is in sliding fit with the first ejector pin 6 and the second ejector pin 7, so that the jacking of the ejector pin panel 4 is more stable.
The upper end of the first thimble 6 is further provided with a top block 10, and the upper end of the top block 10 is provided with a convex part or a concave part. The concave part of the top block 10 at the upper end of the first thimble 6 is used for forming a convex rib protruding downwards for the product.
Based on the same invention concept, the invention also provides a demoulding and resetting method of the secondary ejection demoulding mould, which comprises the following steps:
driving the ejector pin panel 4 to be close to the mold core 3 by using an oil cylinder driving system of the secondary ejection demolding mold, so that the first ejector pin 6 and the second ejector pin 7 are ejected synchronously to finish the primary ejection of the mold;
the ejector pin panel 4 and the mold core 3 are driven to continuously approach by the oil cylinder driving system, the movable elastic block 32 is pushed by the reverse pushing part of the unhooking part 33, the movable elastic block 32 is separated from the hook part 311 of the hook part 31, the ejector pin panel 4 and the ejector pin bottom plate 5 are separated, the second ejector pin 7 is continuously pushed, and the secondary ejection of the mold is completed;
the oil cylinder driving system is used for driving the ejector pin panel 4 to be away from the mold core 3, so that the pushing-back part releases pushing of the movable elastic block 32, the movable elastic block 32 automatically resets and is buckled with the hook part 311, the ejector pin panel 4 is abutted against the ejector pin bottom plate 5, the ejector pin bottom plate 5 is abutted against the mold base 1, and the mold is reset.
The following describes the demolding resetting method of the secondary ejection demolding mold in detail with reference to the specific drawings.
As shown in fig. 3, in this state, the product on the mold is injection molded, i.e., the ejection and demolding operation is about to be performed. As shown in fig. 7, which is a schematic view of the structure of the mold after the one-step/one-step ejection is completed, it can be seen that most of the structure on the product is separated from the mold core 3, and a part, for example, a part in contact with the top block 10 is not separated, and thus, the two-step/two-step ejection is required.
When oil is fed from the oil inlet and the oil outlet below the oil cylinder body 21, the piston rod 22 rises to drive the thimble panel 4 and the thimble base plate 5 to rise synchronously, and when the thimble panel and the thimble base plate rise to the state shown in fig. 7, one-time or one-stage ejection is completed, and in this state, the hook portion 311 and the movable block 321 are still in a buckling state.
When the piston rod 22 continues to ascend, the hook portion 311 is separated from the movable block 321, the ejector pin panel 4 continues to ascend, the ejector pin base plate 5 stops, and the ejector pin panel 4 is separated from the ejector pin base plate 5, as shown in fig. 8. And the second ejector pin 7 continues to eject, so that the product is separated from the ejector block 10, and the mold finishes secondary/secondary ejection.
When the product is taken away, the mold needs to be reset, as shown in fig. 9, the oil inlet and outlet above the oil cylinder body 21 takes oil to lower the piston rod 22, the ejector pin panel 4 is far away from the mold core 3, the ejector pin panel 4 is close to the ejector pin base plate 5, the lower end of the movable block 321 is matched with the upper end of the hook portion 311, the movable block 321 is extruded, the spring 322 is compressed, the movable block 321 is contracted into the counter bore, the movable block 321 is buckled with the hook portion 311, the state is changed to the state shown in fig. 10, and at this time, the ejector pin panel 4 is close to the ejector pin base plate 5. When the piston rod 22 continues to descend, the thimble base plate 5 and the thimble panel 4 descend together until the thimble base plate 5 abuts against the die holder 1, and the secondary resetting of the die is completed. The mold after the completion of the secondary reset is shown in fig. 3. The next injection molding and ejection demolding process of the product can be carried out.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
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| CN202211160639.7A CN115366347A (en) | 2022-09-22 | 2022-09-22 | Secondary ejection demolding mold and demolding resetting method |
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Cited By (1)
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Application publication date: 20221122 |