CN109049545B - A mould for injection moulding of U type return bend spare - Google Patents
A mould for injection moulding of U type return bend spare Download PDFInfo
- Publication number
- CN109049545B CN109049545B CN201810600873.4A CN201810600873A CN109049545B CN 109049545 B CN109049545 B CN 109049545B CN 201810600873 A CN201810600873 A CN 201810600873A CN 109049545 B CN109049545 B CN 109049545B
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- die
- mold
- core
- movable
- fixed
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
- B29C45/332—Mountings or guides therefor; Drives therefor
-
- 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
-
- 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
- B29C45/332—Mountings or guides therefor; Drives therefor
- B29C2045/334—Mountings or guides therefor; Drives therefor several transversely movable mould parts driven by a single drive means
-
- 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
- B29C2045/4063—Removing or ejecting moulded articles preventing damage to articles caused by the ejector
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/004—Bent tubes
Abstract
The invention relates to the technical field of pipe fitting forming dies, in particular to a die for injection molding of a U-shaped bent pipe fitting. The die for injection molding of the U-shaped bent pipe piece comprises a sliding seat capable of moving along the die clamping direction of the movable die, a stripper plate capable of moving towards the movable core from a die locking position to a die releasing position, and a telescopic device for driving the stripper plate. The core mold comprises a pair of movable cores and a pair of fixed cores, and when the stripper plate moves from the mold locking position to the demolding position, the stripper plate extrudes the end face of the U-shaped bent pipe fitting after molding, so that the U-shaped bent pipe fitting is separated from the movable cores and the fixed cores. In the invention, the U-shaped bent pipe piece is pushed to be separated from the core mold by the stripper plate, and the automatic demolding can be completed without arranging a thimble, so that the surface of the U-shaped bent pipe piece has no ejection mark and is more attractive.
Description
Technical Field
The invention relates to the technical field of pipe fitting forming dies, in particular to a die for injection molding of a U-shaped bent pipe fitting.
Background
Plastic pipes are steadily developed, and PE pipes, PP-R pipes and UPVC pipes all occupy a place, wherein the strong development of PE pipes is most remarkable. The PE pipe has wide application field. Wherein the feed pipe and the gas pipe are the two largest application markets thereof. PE is widely applied to the field of water supply pipe manufacturing due to the characteristics of high strength, high temperature resistance, corrosion resistance, no toxicity and the like. Because it does not rust, it is an ideal pipe material for replacing common iron water supply pipe. The U-shaped bend of the PE pipe fitting is mainly applied to a ground source heat pump system and mainly has a U-shaped structure for playing a role in connecting a folded laying joint of a pipeline in the process of laying the pipeline. The special of the shape structure of the injection U-shaped bent pipe fitting determines that the mold core needs to rotate at a certain angle in the process of designing the inner hole core pulling of the mold, and in order to simplify the mold structure, the traditional method is to use a simple loose joint at the joint of the mold core and the sliding block, the core pulling process is mechanical, the demolding resistance is high, the loose core pulling core is easy to damage, the mold life is short, the quality of the U-shaped bent pipe fitting is unstable, the production efficiency is low, and the inner hole of the U-shaped bent pipe fitting is small.
As shown in fig. 1, the U-shaped bent injection molding PE pipe fitting forming die with the Chinese patent publication number of CN202037810U comprises a die core and a connecting mechanism matched with the die core, wherein a movable die core is arranged in a cavity of a die shell, and the core of the die core adopts a two-section structure capable of moving in two directions, so that the damage of a core pulling core is reduced, and the service life of the core is ensured; the core connection adopts a connecting rod mechanism, so that the core pulling sequence of the two cores is effectively controlled, and the smooth demoulding of the U-shaped bent pipe piece is ensured; the two matching parts of the mold core are provided with corresponding exhaust channels so as to be beneficial to cooling of the front-section core; the demoulding mechanism adopts an oil cylinder secondary core pulling mode and ejector pin ejection, and the oil cylinder performs core pulling for one section, so that a rear section core is separated from the U-shaped bent pipe piece, and a space is reserved for rotary demoulding of a front section core; the second core-pulling is a connecting rod mechanism, the front core generates centripetal force through a connecting rod, and the front core is separated from the plastic pipe fitting through rotation and forward extension.
According to the U-shaped bent injection PE pipe fitting forming die, sliding friction is generated between the fixed core 4 and the material closing opening of the movable die plate 5 of the die each time the die is closed and reset, the service life of the fixed core is easy to be short, and the produced U-shaped bent pipe fitting is easy to have flash. The mould utilizes the ejector pin ejection mode to enable the U-shaped bent pipe piece to be demolded, and the ejector pin ejection trace can be left on the surface of the U-shaped bent pipe piece, so that the attractiveness of the surface of the U-shaped bent pipe piece is affected.
Disclosure of Invention
The invention aims to provide a die for injection molding of a U-shaped bent pipe fitting, which has the advantages of automatic demolding without ejection of a thimble and long service life of a fixed core.
In order to achieve the advantages, the mould for injection molding of the U-shaped bent pipe piece comprises a fixed mould, a movable mould, a core mould, a sliding seat, a stripper plate and a telescopic device, wherein the fixed mould and the movable mould form a cavity of the U-shaped bent pipe piece, the sliding seat can move along the mould clamping direction of the movable mould, the stripper plate can move towards the movable core from a mould locking position to a mould releasing position, the telescopic device is used for driving the stripper plate, the movable mould can move between a mould opening position of the movable mould and a mould clamping position of the movable mould, and the core mould comprises a pair of movable cores and a pair of fixed cores;
a compression spring is arranged between the sliding seat and the movable mould and is used for driving the movable mould seat to move to a demoulding position of the sliding seat along the mould opening direction of the movable mould, so that the core mould drives the injection-molded U-shaped bent pipe fitting to be separated from the movable mould;
the movable die can extrude the sliding seat along the die assembly direction, so that the demolding position is moved to the die assembly position of the sliding seat;
the fixed core is of a tubular structure, the movable core is hinged with a pull rod accommodated in the fixed core, and a transmission plate is fixed at the end part of the pull rod, which penetrates through the sliding seat;
a mold locking rod is arranged between the transmission plate and the stripper plate, and one end or two ends of the mold locking rod are not fixed with the transmission plate and the stripper plate;
when the stripper plate moves from the mold locking position to the mold stripping position, the mold locking rod is not pressed, and the stripper plate extrudes the end face of the formed U-shaped bent pipe fitting to separate the U-shaped bent pipe fitting from the movable core and the fixed core;
when the stripper plate moves from the stripping position to the mold locking position, the mold locking rod is pressed to drive the pull rod to enable the movable core to move to the movable core mold locking position close to the fixed core.
In one embodiment of the invention, during the separation of the U-shaped bent pipe fitting from the movable core and the fixed core, the movable core rotates away from the fixed core, and at the same time, the movable core rotates relative to the pull rod.
In one embodiment of the present invention, the sliding seat is provided with through holes for accommodating the mold locking rod and the pull rod, respectively.
In one embodiment of the present invention, the sliding seat is fixed with a limiting screw, the moving die is fixed with a limiting block located beside the sliding seat, the limiting block is provided with a limiting slot hole for accommodating the limiting screw, and the limiting screw and the limiting slot hole are matched to limit the moving range of the sliding seat.
In one embodiment of the invention, the stripper plate is fixed with a guide rod, and the sliding seat is provided with a through hole for accommodating the guide rod.
In one embodiment of the invention, the fixed die is fixed with a sliding rail, and the movable die is provided with a sliding matching part corresponding to the sliding rail.
In one embodiment of the invention, the fixed die comprises a die core and a fixed die plate, and the sliding seat is attached to the side face of the die core when the sliding seat is in the die clamping position of the sliding seat.
In one embodiment of the invention, the mode locking rod is fixedly connected with the transmission plate.
In one embodiment of the invention, the U-shaped tube member is made of one of the materials PE, PPR, PVC.
In one embodiment of the invention, the telescoping device is a hydraulic ram.
In the invention, the compression spring is arranged between the sliding seat and the movable mould, so that the sliding seat can move in the mould opening direction and then drives the U-shaped bent pipe piece to be separated from the movable mould, sliding friction can not be generated between the core mould and the material closing opening of the movable mould, and the produced U-shaped bent pipe piece is not easy to have flash.
In the invention, the U-shaped bent pipe fitting is pushed to be separated from the core mold by the stripper plate, and the automatic demolding can be completed without arranging a thimble, so that the surface of the U-shaped bent pipe fitting is more attractive compared with the prior art.
Drawings
Fig. 1 is a schematic structural diagram of a conventional U-shaped bent injection molding PE pipe molding die.
Fig. 2 is a schematic structural view of a mold for injection molding a U-shaped bent pipe fitting according to a first embodiment of the present invention.
Fig. 3 is a schematic structural view of a stationary mold of the mold of fig. 2.
Fig. 4 is a schematic diagram showing a clamping state of the movable mold of the mold of fig. 2.
Fig. 5 is a schematic diagram showing an opened state of the mold of fig. 2.
Fig. 6 is a schematic diagram showing a release state of a core mold of the mold of fig. 2.
Fig. 7 is a plan view showing a release state of the core mold of fig. 6.
Detailed Description
In order to further describe the technical means and effects adopted for achieving the preset aim of the invention, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the invention with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 2 to 4, the mold for injection molding of a U-shaped bent pipe piece according to the first embodiment of the present invention includes a fixed mold a, a movable mold B, a core mold C, a stripper plate 6 movable toward a movable core 2 from a mold locking position to a mold releasing position, a slide seat 7 movable in a mold locking direction of the movable mold B, and a telescopic device 10 for driving the stripper plate 6. Preferably, the telescoping device 10 is a hydraulic ram.
The fixed die A comprises a fixed die plate 12 and a die core 13, and when the sliding seat 7 is positioned at the die closing position of the sliding seat 7, the sliding seat 7 is attached to the side face of the die core 12. The fixed die A is fixed with a sliding rail A0, and the movable die B is provided with a sliding matching part B1 corresponding to the sliding rail. Preferably, the sliding rail A0 and the sliding fit portion B1 are respectively a guide sleeve and a guide pillar.
The fixed die A and the movable die B are respectively and fixedly provided with a position precision device D which is used for guaranteeing the position precision of the fixed die A and the movable die B in a die clamping state. Preferably, the position accuracy device D is a fine positioning.
The movable die B can move between a die opening position of the movable die B and a die closing position of the movable die B. The movable mould B comprises a mould core 17 and a movable mould plate 16. The movable die B can press the slide block 7 in the die clamping direction, and move the slide block 7 from the die release position to the die clamping position.
The core mold C includes a pair of movable cores 2 and a pair of fixed cores 5. The fixed core 5 is of a tubular structure, the movable core 2 is hinged with a pull rod 4 accommodated in the fixed core 5, and a transmission plate 11 is fixed at the end part of the pull rod 4 penetrating through the sliding seat 7. In the process of separating the U-shaped bent pipe piece from the movable core 2 and the fixed core 5, the movable core 2 rotates back to the fixed core 5, and meanwhile, the movable core 2 rotates relative to the pull rod 4.
A mold locking rod 9 is arranged between the stripper plate 6 and the transmission plate 11, and one end or two ends of the mold locking rod 9 are not fixed with the transmission plate 11 and the stripper plate 6.
Preferably, the mold locking rod 9 is fixedly connected with the transmission plate 11. When the stripper plate 6 moves from the mold locking position to the mold releasing position, the mold locking rod 9 is not pressed, and the end face of the U-shaped bent pipe piece after extrusion molding of the stripper plate 6 is separated from the movable core 2 and the fixed core 5. The stripper plate 6 is also fixed with a guide rod 8, and the guide rod 8 facilitates the reset of the stripper plate 6.
A compression spring 14 is arranged between the sliding seat 7 and the movable die B, and the compression spring 14 is used for driving the movable die B seat to move to the demoulding position of the sliding seat 7 along the die opening direction of the movable die B, so that the core die C drives the U-shaped bent pipe fitting after injection molding to be separated from the fixed die A. The sliding seat 7 is provided with through holes for accommodating the guide rod 8, the mold locking rod 9 and the pull rod 4 respectively.
The sliding seat 7 is fixed with a limit screw 15, the movable mould B is fixed with a limit block 18 positioned beside the sliding seat 7, and the limit block 18 is used for preventing the sliding seat 7 from swinging in the sliding process and can accurately reset during resetting. The limiting block 18 is provided with a limiting long hole 180 for accommodating the limiting screw 15, and the limiting screw 15 and the limiting long hole 180 are matched to limit the moving range of the sliding seat 7. The U-bend tube is made of one of the materials PE, PPR, PVC.
Working principle of a die for injection molding of a U-shaped bent pipe piece:
referring to fig. 5-7, when the injection mold is opened, the sliding seat 7 moves along the opening direction under the action of the two compression springs 14, and the U-shaped bent pipe piece moves along with the core mold in the opening direction to be separated from the movable mold. The sliding seat 7 moves to the limiting position of the limiting screw 15 under the action of the limiting screw 15, and at the moment, the stripper plate 6 can safely enter and exit the sliding seat 7. The hydraulic cylinder is connected with the demoulding plate 6, the demoulding plate 6 moves towards the demoulding direction under the drive of the hydraulic cylinder, and four guide rods 8 are used as guide assistance. When the stripper plate 6 is contacted with the U-shaped bent pipe fitting 1, the movable core 2 is driven by the U-shaped pipe to move towards the demolding direction, the pull rod 4 moves towards the demolding direction, the limiting effect is added, the movable core 2 rotates for a certain angle according to the radian of the U-shaped bent pipe fitting, the movable core 2 and the U-shaped bent pipe fitting 1 are ensured not to be damaged by pulling, and the U-shaped bent pipe fitting is safely separated.
When the die is reset, the stripper plate 6 moves towards the die locking direction under the drive of the hydraulic oil cylinder and contacts with four reset rods 9, the four reset rods 9 drive the transmission plate 11 to drive the movable cores 2 to move towards the die locking direction together, so that a pair of movable cores 2 are mutually attached and respectively attached to the corresponding fixed cores 5, and the reset effect of the movable cores 2 is achieved. At the same time the stripper plate 6 is also moved just to the clamping position. Then, the movable die B starts to clamp, presses the slide base 7 in the clamping direction, resets the slide base 7, and compresses the two compression springs 14. And the die assembly is completed to ensure that the next die continues to be produced.
In the invention, the compression spring is arranged between the sliding seat and the movable mould, so that the sliding seat can move in the mould opening direction and then drives the U-shaped bent pipe piece to be separated from the movable mould, sliding friction can not be generated between the core mould and the material closing opening of the movable mould, and the produced U-shaped bent pipe piece is not easy to have flash.
In the invention, the U-shaped bent pipe fitting is pushed to be separated from the core mold by the stripper plate, and the automatic demolding can be completed without arranging a thimble, so that the surface of the U-shaped bent pipe fitting is more attractive compared with the prior art.
The present invention is not limited to the above embodiments, but is capable of modification in all aspects and variations in all aspects without departing from the spirit and scope of the present invention.
Claims (7)
1. A die for injection molding of U-shaped bent pipe pieces comprises a fixed die, a movable die and a core which form a cavity of the U-shaped bent pipe pieces
A die, the movable die can move between a die opening position and a die closing position, the core die comprises a pair of movable cores and a pair of movable cores
The fixed core is characterized in that the die also comprises a sliding seat capable of moving along the die clamping direction of the movable die and capable of facing to
The movable core moves from a mold locking position to a mold releasing position, and a telescopic device for driving the mold releasing plate;
a compression spring is arranged between the sliding seat and the movable mould and is used for driving the sliding seat to move along the movable mould
The die opening direction moves to the demoulding position of the sliding seat, so that the core die drives the U-shaped bent pipe fitting after injection molding to be separated from the movable die;
the movable die can extrude the sliding seat along the die assembly direction, so that the demolding position is moved to the die assembly position of the sliding seat;
the fixed core is tubular, the movable core is hinged with a pull rod accommodated in the fixed core, and the pull rod passes through the fixed core
A transmission plate is fixed at the end part of the sliding seat;
a mold locking rod is arranged between the transmission plate and the stripper plate, one end or two ends of the mold locking rod are connected with the transmission plate and the stripper plate
The stripper plate is not fixed;
when the stripper plate moves from the mold locking position to the demolding position, the mold locking rod is not pressed, and the demolding is performed
The plate extrudes the end face of the U-shaped bent pipe fitting after the molding to lead the U-shaped bent pipe fitting to be separated from the movable core and the fixed core
Separating;
when the stripper plate moves from the stripping position to the mold locking position, the mold locking rod is pressed to drive the pull rod
Moving the movable core to a movable core mold locking position close to the fixed core;
at the U-shaped elbow
In the process of separating the piece from the movable core and the fixed core, the movable core rotates back to the fixed core, and simultaneously
The movable core rotates relative to the pull rod;
the sliding seat is opened
Through holes for accommodating the mold locking rod and the pull rod respectively are formed;
the sliding seat is fixed
A limiting screw is fixed, the movable mould is fixed with a limiting block positioned beside the sliding seat, and the limiting block is provided with a groove for accommodating the limiting screw
And the limiting long hole of the position screw is matched with the limiting long hole to limit the moving range of the sliding seat.
2. The mold for injection molding of U-bend pieces of claim 1, wherein said stripper plate is secured
The guide rod is fixed, and the sliding seat is provided with a through hole for accommodating the guide rod.
3. The mold for injection molding of U-shaped bent pipe fitting according to claim 1, wherein the fixed mold is fixed
The movable mould is provided with a sliding matching part corresponding to the sliding rail.
4. The mold for injection molding of a U-shaped bent pipe fitting according to claim 1, wherein the stationary mold comprises
The mold comprises a mold core and a fixed mold plate, wherein the sliding seat is attached to the side face of the mold core when the sliding seat is positioned at the mold closing position of the sliding seat.
5. The mold for injection molding of U-bend parts according to claim 1, wherein said mold locking bar is connected with
The transmission plate is fixedly connected.
6. The mold for injection molding a U-shaped elbow according to claim 1, wherein the U-shaped elbow is made of one of the materials PE, PPR, PVC.
7. The mold for injection molding of U-shaped bent pipe pieces according to claim 1, wherein the telescoping device is a hydraulic ram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810600873.4A CN109049545B (en) | 2018-06-12 | 2018-06-12 | A mould for injection moulding of U type return bend spare |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810600873.4A CN109049545B (en) | 2018-06-12 | 2018-06-12 | A mould for injection moulding of U type return bend spare |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109049545A CN109049545A (en) | 2018-12-21 |
| CN109049545B true CN109049545B (en) | 2023-09-01 |
Family
ID=64820281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810600873.4A Active CN109049545B (en) | 2018-06-12 | 2018-06-12 | A mould for injection moulding of U type return bend spare |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109049545B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112024667A (en) * | 2020-08-18 | 2020-12-04 | 新昌县开铭制冷配件有限公司 | Method for processing U-shaped pipe |
| CN113665062A (en) * | 2021-07-30 | 2021-11-19 | 深圳市南和建毅模具有限公司 | Mould for producing nasal oxygen tube |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109049545A (en) | 2018-12-21 |
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