CN107053606B - One-time injection molding mold and molding method for tubular product - Google Patents

Abstract

The invention discloses a one-time injection molding die for a tubular product, which is used for performing one-time injection molding on the product by two parts and comprises a mold stacking panel, a water gap plate, a front template, a rear template, an ejector pin panel, an ejector pin bottom plate and a mold stacking bottom plate which are sequentially arranged in a laminated structure, wherein the ejector pin panel and the ejector pin bottom plate are fixed together, square irons are respectively arranged on two side edges of the ejector pin panel and the ejector pin bottom plate, a first oil cylinder and a second oil cylinder are arranged at the top of the die, a third oil cylinder is arranged on the outer side surface of the mold stacking bottom plate, and a fourth oil cylinder is arranged on one side surface of the front template, which is adjacent to. The invention also discloses a one-time injection molding method of the tubular product, which comprises the first step, the second step, the third step, the fourth step, the fifth step and the sixth step. The one-time injection molding die and the one-time injection molding method for the tubular product can improve the yield of the product and have safe production process.

Description

One-time injection molding mold and molding method for tubular product

Technical Field

The invention relates to an injection molding mold, in particular to a one-time injection molding mold of a tubular product and a molding method thereof.

Background

At present, in the prior art, as shown in fig. 1a, a schematic structural diagram of a tubular product is shown, and fig. 1B is a cross-sectional view along a line M-M in fig. 1a, which shows that a tubular product in the prior art is divided into A, B parts for injection molding, a product a is manufactured first, and then the product a is placed in a mold for encapsulation treatment to manufacture a product B, so that one-step molding cannot be realized. According to the prior art, when a product B is injection molded, the product A is deformed under the influence of injection molding pressure, so that the inside of the product is damaged, the product cannot be used, and the yield of the product is not high. Because during injection moulding product B, need artifically place product A in the mould, can lead to the machine to press the artificial important incident of becoming easily, reduce the security of product production process.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a one-shot injection mold for tubular products and a molding method thereof, which have high yield and safe production process.

In order to achieve the purpose, the invention provides a one-time injection molding die for a tubular product, which is used for performing one-time injection molding on the product by two parts, and comprises a mold stacking panel, a water gap plate, a front template, a rear template, an ejector pin panel, an ejector pin bottom plate and a mold stacking bottom plate which are sequentially arranged in a laminated structure, wherein the ejector pin panel and the ejector pin bottom plate are fixed together; a first cavity and a second cavity which are respectively used for injecting two parts of a product are arranged between the front template and the rear template, the first cavity and the second cavity are centrosymmetric, a first pouring gate and a second pouring gate are respectively arranged at the middle of the first cavity and one side of the second cavity on the front template, and the first pouring gate and the second pouring gate are respectively used for pouring two parts of the product; and the rear template, the thimble panel and the thimble bottom plate are fixed on a movable template of the injection molding machine by the mold stacking bottom plate.

Preferably, a positioning ring is arranged in the middle of the mold stacking panel and used for positioning and mounting the mold on the injection molding machine, so that a nozzle of the injection molding machine is aligned with an injection port of the mold.

Preferably, a front mold core is arranged on the front mold plate, a rear mold core corresponding to the front mold core is arranged on the rear mold plate, and after mold closing, the first cavity and the second cavity are formed between the front mold core and the rear mold core.

Preferably, a row of multiple ejector pins are fixedly arranged on the ejector pin panel opposite to the second cavity, return springs are arranged at the upper end and the lower end between the ejector pin panel and the rear module, the ejector pins eject the injection-molded product when the mold is opened, and the return springs enable the ejector pins to reset.

Preferably, the rear mold plate is provided with insert needle pressing plates at positions opposite to the first cavity and the second cavity, and a row of a plurality of insert needles are fixedly arranged on the insert needle pressing plates.

Preferably, a flow channel switch is arranged on the front template at one side of the injection port, and the flow channel switch is perpendicular to the front mold core.

Preferably, the first gate and the second gate are respectively connected with a first gate sleeve and a second gate sleeve, one end of each of the first gate sleeve and the second gate sleeve is respectively connected with different crochet hooks, the crochet hooks are fixedly arranged on a pressing plate, and after once injection molding is completed, the crochet hooks enable the corresponding first gate and second gate to be separated from the first cavity and the second cavity respectively.

Preferably, a first slide block, a second slide block, a third slide block, a fourth slide block and a fifth slide block are respectively arranged between the front template and the rear template, and a push rod rotating shaft is vertically and outwardly arranged in the middle of the rear mold core.

Preferably, the outer side of the push rod rotating shaft is provided with a gear, a first guide sleeve and a second guide sleeve respectively, a rack is arranged on one side of the gear, the gear and the rack are meshed and connected, the push rod rotating shaft is driven to rotate through transmission of the gear and the rack, so that the rear mold core rotates along with the push rod rotating shaft, and the rear mold core rotates 180 degrees along with the push rod rotating shaft and then still forms the first cavity and the second cavity between the front mold cores.

Preferably, the first slider, the third slider and the fourth slider are respectively arranged on three side surfaces of the rear mold core adjacent to the first mold cavity, and the second slider and the fifth slider are respectively arranged on two side surfaces of the rear mold core adjacent to the second mold cavity.

Preferably, a first guide pillar and a second guide pillar are respectively arranged between the front template and the rear template and close to the third slider and the fourth slider; the second slider and the fifth slider are respectively provided with a first inclined guide post groove and a second inclined guide post groove, the first inclined guide post groove and the second inclined guide post groove extend to the front template in an inclined mode and are respectively provided with a first inclined guide post and a second inclined guide post corresponding to the first inclined guide post groove and the second inclined guide post groove, and the first inclined guide post and the second inclined guide post drive in a guiding mode to enable the second slider and the fifth slider to slide outwards to expand or slide inwards to gather together.

Preferably, a first oil cylinder pull rod is connected between the first oil cylinder and the first sliding block, two oil cylinder fixing plates are arranged between the first oil cylinder and the first oil cylinder pull rod, and a switch is arranged on one side of the oil cylinder fixing plate close to the first oil cylinder; a second oil cylinder pull rod is connected between the second oil cylinder and the rear template, and an oil cylinder fixing plate is arranged between the second oil cylinder and the second oil cylinder pull rod; a third oil cylinder pull rod is connected between the third oil cylinder and the push rod rotating shaft; a fourth oil cylinder pull rod is connected between the fourth oil cylinder and the fourth sliding block, and two oil cylinder fixing plates are arranged between the fourth oil cylinder and the fourth oil cylinder pull rod; and one side of the first sliding block and one side of the second oil cylinder pull rod are respectively provided with a switch fixing plate.

The invention also provides a one-time injection molding method of the tubular product, which comprises the following steps of:

the method comprises the following steps: closing the die, wherein the first slide block, the second slide block, the third slide block, the fourth slide block and the fifth slide block are all in a core feeding state, the first cavity and the second cavity are both hollow, the runner switch is closed, only the first sprue is fed with glue, and a part of the body of the product is molded in the first cavity;

step two: manually opening the flow channel switch;

step three: opening the mold, wherein a first oil cylinder, a second oil cylinder, a third oil cylinder, a fourth oil cylinder, a first inclined guide post and a second inclined guide post drive a first slide block, a second slide block, a third slide block, a fourth slide block and a fifth slide block to slide outwards and expand, the rear mold core is ejected out of the mold frame through a push rod rotating shaft, the rear mold core rotates 180 degrees along the push rod rotating shaft through the transmission of a rack and a gear, and then the rear mold core is pulled back to the mold frame through the push rod rotating shaft, so that a first product body formed by the first sprue in the first step rotates to a second cavity on the other side along with the rotation of the rear mold core;

step four: the mold is closed, the first oil cylinder, the second oil cylinder, the third oil cylinder, the fourth oil cylinder, the first inclined guide post and the second inclined guide post drive the first slide block, the second slide block, the third slide block, the fourth slide block and the fifth slide block to slide inwards and gather together, the first sprue and the second sprue are filled with glue simultaneously, one part of the body of a product is molded by the first sprue in the first cavity, and the second part of the body of the product is molded by the second sprue in the second cavity;

step five: opening the mold, and ejecting the complete product formed in the second cavity;

step six: repeating the third to fifth steps, and circulating the steps and continuously producing.

The one-time injection molding die and the molding method of the tubular product can divide the tubular product into two parts and perform one-time injection molding, can avoid deformation caused by the influence of injection pressure, can avoid internal damage of the product, can improve the yield of the product, and have safe production process.

Drawings

FIG. 1a is a schematic view of a tubular product;

FIG. 1b is a cross-sectional view taken along line M-M of FIG. 1a, illustrating a prior art two-part injection molding of a tubular product in A, B parts;

FIG. 2 is a cross-sectional view taken along line M-M of FIG. 1a, illustrating the tubular product of the present invention as a two-part C, D injection molded article;

FIG. 3 is a side sectional view of a one-shot injection molding die for a tubular product of the present invention;

FIG. 4 is a top cross-sectional view of a one-shot injection molding die for a tubular product of the present invention;

FIG. 5 is a top partial cross-sectional view of a one-shot injection molding die for a tubular product of the present invention;

fig. 6 is a top partial sectional view of a one-shot injection molding die for a tubular product of the present invention.

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.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 2 to 6, the one-shot injection molding mold for tubular products of the present invention divides a product into two parts, namely, a first body (D in fig. 2) and a second body (C in fig. 2), and the one-shot injection molding mold comprises a mold stacking panel 1, a nozzle plate 2, a front mold plate 3, a rear mold plate 4, an ejector pin panel 5, an ejector pin bottom plate 6, and a mold stacking bottom plate 7, which are sequentially arranged in a stacked structure, wherein the ejector pin panel 5 and the ejector pin bottom plate 6 are fixed together, square irons 8 are respectively disposed on two side edges of the ejector pin panel 5 and the ejector pin bottom plate 6, a first oil cylinder 11 and a second oil cylinder 12 are disposed on the top of the mold, a third oil cylinder 13 is disposed on the outer side surface of the mold stacking bottom plate 7, and a fourth oil cylinder 14 is disposed on one side surface of the adjacent. The mold setting bottom plate 7 is used for fixing the rear mold plate 4, the ejector pin panel 5 and the ejector pin bottom plate 6 on a movable mold plate of the injection molding machine.

As shown in fig. 4, a positioning ring 10 is disposed in the middle of the mold stacking panel 1 for positioning and mounting a mold on an injection molding machine, so that a nozzle of the injection molding machine is aligned with an injection port 100 of a mold runner system.

As shown in fig. 3, a front mold core 30 is arranged on the front mold plate 3, a rear mold core 40 corresponding to the front mold core 30 is arranged on the rear mold plate 4, and after mold closing, a first mold cavity 31 and a second mold cavity 32 which are centrosymmetric are formed between the front mold core 30 and the rear mold core 40. A flow channel switch 33 is arranged on the front template 3 at one side of the injection port 100 and perpendicular to the front mold core 30, and the flow channel switch 33 is used for controlling the glue feeding state of the flow channel system.

As shown in fig. 3, a first gate 34 and a second gate 35 are respectively disposed on the front mold plate 3 at the middle of the first cavity 31 and at one side of the second cavity 32, the first gate 34 is used for injection molding of a product D, the second gate 35 is used for injection molding of a product C, the first gate 34 and the second gate 35 are respectively connected to a first gate housing 340 and a second gate housing 350, one end of the first gate housing 340 and one end of the second gate housing 350 are respectively connected to a crochet hook 345, and the crochet hook 345 is fixedly disposed on a pressure plate 346. After one injection is completed, the first gate 34 and the second gate 35 are separated from the first cavity 31 and the second cavity 32 by the crochet needle 345, respectively, for the next injection.

Between the front mold plate 3 and the rear mold plate 4, three side surfaces of the rear mold core 40 adjacent to the first cavity 31 are respectively provided with a first slide block 41, a third slide block 43 and a fourth slide block 44, and two side surfaces of the rear mold core 40 adjacent to the second cavity are respectively provided with a second slide block 42 and a fifth slide block 45. A push rod rotating shaft 46 vertically extends outwards from the middle position of the rear mold core 40, a gear 47, a first guide sleeve 461 and a second guide sleeve 462 are respectively arranged on the outer side of the push rod rotating shaft 46, a rack 48 is arranged on one side of the gear 47, the gear 47 is meshed with the rack 48, the push rod rotating shaft 46 is driven to rotate through the transmission of the gear 47 and the rack 48, so that the rear mold core 40 can rotate along with the push rod rotating shaft 46, and in the injection molding process, after the rear mold core 40 rotates 180 degrees along with the push rod rotating shaft 46, a first mold cavity 31 and a second mold cavity 32 which are completely the same as those before rotation are formed between the rear mold core 40 and the front mold core 30, so.

Between the front mold plate 3 and the rear mold plate 4, a first guide post 430 and a second guide post 440 are respectively provided near the third slider 43 and the fourth slider 44.

The second slider 42 and the fifth slider 45 are respectively provided with a first inclined guide post groove 420 and a second inclined guide post groove 450, and the first inclined guide post groove 420 and the second inclined guide post groove 450 extend obliquely to the front template 3 and are respectively provided with a first inclined guide post 421 and a second inclined guide post 451 corresponding thereto. In the process of switching between the mold opening and the mold closing, the first inclined guide post 421 and the second inclined guide post 451 guide and drive the second slide block 42 and the fifth slide block 45 to slide outwards and expand or slide inwards and gather together.

A first cylinder pull rod 110 is connected between the first cylinder 11 and the first slider 41, two cylinder fixing plates 111 are arranged between the first cylinder 11 and the first cylinder pull rod 110, and a switch 112 is arranged on one side of the cylinder fixing plate 111 adjacent to the first cylinder 11. A second cylinder pull rod 120 is connected between the second cylinder 12 and the rear template 4, and a cylinder fixing plate 111 is arranged between the second cylinder 12 and the second cylinder pull rod 120. A third cylinder pull rod 130 is connected between the third cylinder 13 and the push rod rotating shaft 46. A fourth cylinder pull rod 140 is connected between the fourth cylinder 14 and the fourth slider 44, and two cylinder fixing plates 111 are arranged between the fourth cylinder 14 and the fourth cylinder pull rod 140. One side of the first slider 41 and one side of the second cylinder rod 120 are respectively provided with a switch fixing plate 123.

A row of multiple ejector pins 50 are fixedly arranged on the ejector pin panel 5 opposite to the second cavity 32, return springs 51 are arranged at the upper end and the lower end between the ejector pin panel 5 and the rear module 4, the ejector pins 50 are used for ejecting injection-molded products during mold opening, and the return springs 51 are used for resetting the ejector pins 50.

The back mold plate 4 is provided with insert needle pressing plates 400 at positions opposite to the first cavity 31 and the second cavity 32, and a row of a plurality of insert needles 401 are fixedly arranged on the insert needle pressing plates 400. The insert 401 is matched with the thimble 50 to eject the injection molded product.

The embodiment of the invention also provides a one-time injection molding method of the tubular product, which comprises the following steps:

the method comprises the following steps: closing the die, namely closing the die, wherein the first slide block 41, the second slide block 42, the third slide block 43, the fourth slide block 44 and the fifth slide block 45 are all in a core feeding state, the first cavity 31 and the second cavity 32 of the die are empty, closing the runner switch 33, only allowing the first gate 34 to feed glue, and forming a product D part in the first cavity 31;

step two: the flow channel switch 33 is manually opened;

step three: opening the mold, namely driving a first slide block 41, a second slide block 42, a third slide block 43, a fourth slide block 44 and a fifth slide block 45 to slide outwards and expand by a first oil cylinder 11, a second oil cylinder 12, a third oil cylinder 13, a fourth oil cylinder 14, a first inclined guide post 421 and a second inclined guide post 451, ejecting the rear mold core 40 out of the mold frame through a push rod rotating shaft 46, rotating the rear mold core 40 180 degrees along the push rod rotating shaft 46 through the transmission of a rack 48 and a gear 47, and then pulling the rear mold core 40 back to the mold frame through the push rod rotating shaft 46, so that a product D formed by the first sprue 34 in the step one rotates to the second cavity 32 on the other side along with the rotation of the rear mold core 40;

step four: closing the dies, wherein the first oil cylinder 11, the second oil cylinder 12, the third oil cylinder 13, the fourth oil cylinder 14, the first inclined guide post 421 and the second inclined guide post 451 drive the first slide block 41, the second slide block 42, the third slide block 43, the fourth slide block 44 and the fifth slide block 45 to slide inwards and gather together, the first gate 34 and the second gate 35 simultaneously feed glue, the first gate 34 continuously forms a part D of the product in the first cavity 31, and the second gate 35 forms a part C of the product in the second cavity 32;

step five: opening the mold, and ejecting the complete product molded in the second cavity 32;

step six: repeating the third to fifth steps, and circulating the steps and continuously producing.

The one-time injection molding die for the tubular product can be used for one-time injection molding of the tubular product, such as multi-valve pipe fittings like a water faucet.

Therefore, the one-time injection molding die and the molding method of the tubular product can divide the tubular product into two parts and perform one-time injection molding, can avoid deformation caused by the influence of injection pressure, can prevent the internal damage of the product, can improve the yield of the product, and are safe in production process.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (13)

1. The one-time injection molding die for the tubular product is characterized by comprising a mold stacking panel, a water gap plate, a front template, a rear template, an ejector pin panel, an ejector pin bottom plate and a mold stacking bottom plate which are sequentially arranged in a laminated structure, wherein the ejector pin panel and the ejector pin bottom plate are fixed together; a first cavity and a second cavity which are respectively used for injecting two parts of a product are arranged between the front template and the rear template, the first cavity and the second cavity are centrosymmetric, a first pouring gate and a second pouring gate are respectively arranged at the middle of the first cavity and one side of the second cavity on the front template, and the first pouring gate and the second pouring gate are respectively used for pouring two parts of the product; and the rear template, the thimble panel and the thimble bottom plate are fixed on a movable template of the injection molding machine by the mold stacking bottom plate.

2. A one-shot injection molding die for tubular products according to claim 1, wherein a positioning ring is provided in the middle of the mold-holding panel for positioning and mounting the die on the injection molding machine so that the nozzle of the injection molding machine is aligned with the injection port of the die.

3. The mold for one-shot injection molding of a tubular product according to claim 1, wherein a front mold core is provided on the front mold plate, a rear mold core corresponding to the front mold core is provided on the rear mold plate, and after the mold is closed, the first cavity and the second cavity are formed between the front mold core and the rear mold core.

4. A single-shot injection mold for a tubular product according to claim 3, wherein a row of a plurality of pins is fixedly disposed on said pin panel at a position opposite to said second cavity, and a return spring is disposed between said pin panel and said rear panel at both upper and lower ends thereof, wherein said pins eject the injected product when the mold is opened, and said return spring returns said pins.

5. The mold for one-shot injection molding of a tubular product according to claim 3, wherein a plurality of insert pins are fixedly disposed on the insert pin pressing plate at positions opposite to the first cavity and the second cavity, respectively.

6. A one-shot injection molding die for tubular products according to claim 2 or 3, wherein a flow path switch is provided on the front mold plate at one side of the injection port, the flow path switch being perpendicular to the front mold core.

7. The mold for one-shot injection molding of a tubular product according to claim 1, wherein the first gate and the second gate are respectively connected to a first gate sleeve and a second gate sleeve, one end of the first gate sleeve and one end of the second gate sleeve are respectively connected to different crochet hooks, the crochet hooks are fixedly arranged on the pressure plate, and after one-shot injection, the crochet hooks separate the corresponding first gate and second gate from the first cavity and the second cavity respectively.

8. The mold for one-shot injection molding of a tubular product according to claim 3, wherein a first slide block, a second slide block, a third slide block, a fourth slide block and a fifth slide block are respectively disposed between the front mold plate and the rear mold plate, and a push rod rotating shaft is vertically and outwardly disposed at a middle position of the rear mold core.

9. The mold for one-shot injection molding of a tubular product according to claim 8, wherein a gear, a first guide sleeve and a second guide sleeve are respectively disposed outside the push rod rotating shaft, a rack is disposed on one side of the gear, the gear and the rack are engaged, the push rod rotating shaft is driven to rotate by the transmission of the gear and the rack, the rear mold core rotates along with the push rod rotating shaft, and after the rear mold core rotates 180 degrees along with the push rod rotating shaft, the first cavity and the second cavity are still formed between the rear mold core and the front mold core.

10. The single-shot injection mold for tubular products of claim 8, wherein said first, third and fourth slides are respectively disposed on three sides of said rear mold core adjacent to said first cavity, and said second and fifth slides are respectively disposed on two sides of said rear mold core adjacent to said second cavity.

11. The mold for one-shot injection molding of a tubular product according to claim 10, wherein a first guide post and a second guide post are respectively provided between the front mold plate and the rear mold plate, adjacent to the third slider and the fourth slider; the second slider and the fifth slider are respectively provided with a first inclined guide post groove and a second inclined guide post groove, the first inclined guide post groove and the second inclined guide post groove extend to the front template in an inclined mode and are respectively provided with a first inclined guide post and a second inclined guide post corresponding to the first inclined guide post groove and the second inclined guide post groove, and the first inclined guide post and the second inclined guide post drive in a guiding mode to enable the second slider and the fifth slider to slide outwards to expand or slide inwards to gather together.

12. The mold for one-shot injection molding of a tubular product according to claim 10, wherein a first cylinder pull rod is connected between the first cylinder and the first slider, two cylinder fixing plates are disposed between the first cylinder and the first cylinder pull rod, and a switch is disposed on a side of the cylinder fixing plate adjacent to the first cylinder; a second oil cylinder pull rod is connected between the second oil cylinder and the rear template, and an oil cylinder fixing plate is arranged between the second oil cylinder and the second oil cylinder pull rod; a third oil cylinder pull rod is connected between the third oil cylinder and the push rod rotating shaft; a fourth oil cylinder pull rod is connected between the fourth oil cylinder and the fourth sliding block, and two oil cylinder fixing plates are arranged between the fourth oil cylinder and the fourth oil cylinder pull rod; and one side of the first sliding block and one side of the second oil cylinder pull rod are respectively provided with a switch fixing plate.

13. A one-time injection molding method for one-time injection molding of a tubular product of a mold is characterized in that the method is completed by one-time injection molding of the product divided into a first body and a second body, and comprises the following steps:

the method comprises the following steps: closing the die, wherein the first slide block, the second slide block, the third slide block, the fourth slide block and the fifth slide block are all in a core feeding state, the first cavity and the second cavity are both hollow, the runner switch is closed, only the first sprue is fed with glue, and a part of the body of the product is molded in the first cavity;

step two: manually opening the flow channel switch;

step three: opening the mold, wherein a first oil cylinder, a second oil cylinder, a third oil cylinder, a fourth oil cylinder, a first inclined guide post and a second inclined guide post drive a first slide block, a second slide block, a third slide block, a fourth slide block and a fifth slide block to slide outwards and expand, the rear mold core is ejected out of the mold frame through a push rod rotating shaft, the rear mold core rotates 180 degrees along the push rod rotating shaft through the transmission of a rack and a gear, and then the rear mold core is pulled back to the mold frame through the push rod rotating shaft, so that a first product body formed by the first sprue in the first step rotates to a second cavity on the other side along with the rotation of the rear mold core;

step four: the mold is closed, the first oil cylinder, the second oil cylinder, the third oil cylinder, the fourth oil cylinder, the first inclined guide post and the second inclined guide post drive the first slide block, the second slide block, the third slide block, the fourth slide block and the fifth slide block to slide inwards and gather together, the first sprue and the second sprue are filled with glue simultaneously, one part of the body of a product is molded by the first sprue in the first cavity, and the second part of the body of the product is molded by the second sprue in the second cavity;

step five: opening the mold, and ejecting the complete product formed in the second cavity; step six: repeating the third to fifth steps, and circulating the steps and continuously producing.

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