CN113927839A

CN113927839A - Barrel part injection mold with spiral groove

Info

Publication number: CN113927839A
Application number: CN202111157773.7A
Authority: CN
Inventors: 陈元芳; 屈亚龙; 陈浩东
Original assignee: Chongqing University of Technology
Current assignee: Chongqing University of Technology
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-01-14
Anticipated expiration: 2041-09-30
Also published as: CN113927839B

Abstract

The invention discloses a barrel part injection mold with a spiral groove, and relates to the technical field of plastic forming molds. The die comprises a movable die base plate, wherein a movable die fixing plate is fixedly connected to the top end of the movable die base plate, a fastening machine is fixedly connected to one side of the movable die fixing plate, a push plate is fixedly connected to the top end of the movable die fixing plate, a fixed die plate is fixedly connected to the top end of the push plate, and a push plate insert is fixed to one side of the push plate. The invention achieves the design purpose of one mould with two parts by the structural design, ensures the melt to be filled smoothly and quickly by adopting the hot injection nozzle, is convenient to finish the molding of a spiral groove at the top of a plastic part by adopting the design of the fixed mould lateral half core-pulling mechanism, effectively shortens the period of the plastic part by adopting a spiral water tank to cool in the moving mould core and adopting an annular cooling water tank for the fixed mould core and the fixed mould insert, and stably reduces the mould height by designing the structure during the injection molding production.

Description

Barrel part injection mold with spiral groove

Technical Field

The invention relates to the technical field of plastic forming molds, in particular to a barrel part injection mold with a spiral groove.

Background

The injection mold is characterized in that plastic is heated and melted in a heating charging barrel of an injection machine, is pushed by a screw or a plunger, enters a mold cavity through a nozzle and a pouring system of the mold, is hardened and shaped in the mold cavity, is used for molding thermoplastic plastic products, and occupies a large proportion in the molding of the plastic products, but the existing injection mold has the following problems when processing barrel parts:

1. the adopted nozzle injection mode is inconvenient to ensure smooth and quick melt filling;

2. the molding of the spiral groove at the top of the plastic part is not convenient to complete;

3. the cooling time of the plastic part cannot be effectively shortened;

4. the height of the mold is often too high due to the design of the internal mounting structure.

Disclosure of Invention

The invention aims to provide a barrel part injection mould with a spiral groove, which aims to solve the existing problems: the cooling time of the plastic part cannot be effectively shortened.

In order to achieve the purpose, the invention provides the following technical scheme: a barrel part injection mold with a spiral groove comprises a movable mold base plate, wherein a movable mold fixing plate is fixedly connected to the top end of the movable mold base plate, a fastening machine is fixedly connected to one side of the movable mold fixing plate, a push plate is fixedly connected to the top end of the movable mold fixing plate, a fixed mold plate is fixedly connected to the top end of the push plate, a push plate insert is fixed to one side of the push plate, a fixed mold insert is fixedly connected to the inner side of the fixed mold plate, a limit nail is fixed to the inner side of the fixed mold plate, a first spring is further arranged on the inner side of the fixed mold plate, a first spring is installed in a hole in one side of a fixed mold half block, a bent pin fixing plate is fixedly connected to the top end of the fixed mold plate through the limit nail, the fixed mold half block is slidably connected to the inner side of the bent pin fixing plate, a bent pin is fixedly connected to the inner portion of the bent pin fixing plate, and a hot nozzle fixing plate is arranged at the top end of the bent pin fixing plate, the top end of the hot nozzle fixing plate is provided with a supporting plate, the top end of the supporting plate is provided with a fixed die base plate, the inner side of the supporting plate is provided with a hot runner plate, the top end of the hot runner plate is fixedly connected with a positioning ring, the bottom end of the hot runner plate is fixedly connected with a hot nozzle, the outer side of the hot nozzle is sleeved with a fixed mold core, the fixed mold core is positioned at the inner side of the bent pin fixing plate, the inner side of the fixed mold insert is provided with a movable mold core, a distance pull rod is fixedly connected inside one side of the bent pin fixing plate and the fixed template, a third screw is fixedly connected at the bottom end of the distance pull rod, the bottom end of the distance pull rod is fixedly connected with a connecting column through a third screw, the bent pin and the inner part of the fixed template are fixedly connected with a second spring, and a spiral cooling water pipe is arranged in the movable mold core, and an air valve is arranged in the movable mold core.

Preferably, the movable mold base plate is connected with the movable mold fixing plate through a screw, and the mold opening distance of the push plate is controlled by a small pull rod.

Preferably, a second guide pillar is further arranged among the fixed die plate, the push plate and the movable die fixing plate, a second guide sleeve and a third guide sleeve are sleeved on the outer side of the second guide pillar, the second guide sleeve is located inside the fixed die plate, and the third guide sleeve is located inside the push plate.

Preferably, the supporting plate, the hot nozzle fixing plate and the bending pin fixing plate are all fixedly connected with a first guide pillar inside, and a first guide sleeve is sleeved on the outer side of the first guide pillar.

Preferably, a first screw and a second screw are fixed in the fixed die base plate, the supporting plate, the hot nozzle fixing plate and the bent pin fixing plate are fixedly connected through the first screw, and the fixed die base plate, the supporting plate and the hot nozzle fixing plate are further connected through the second screw.

Preferably, the fixed die half block drives the bent pin fixing plate to move through the bent pin.

Preferably, the outer side of the fixed mold insert is provided with an annular cooling water tank.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention achieves the design purpose of one mould with two pieces by the structural design, and adopts the hot nozzle to ensure smooth and quick melt filling;

2. the invention adopts the design of the fixed die lateral half core-pulling mechanism to facilitate the formation of the spiral groove at the top of the plastic part;

3. according to the invention, the spiral water channel is adopted for cooling in the movable mould core, and the annular cooling water channel is adopted for the fixed mould core and the fixed mould insert, so that the cooling time of the plastic part is effectively reduced;

4. the ejector rod of the machine tool is directly connected with the connecting column through the screw, and the connecting column is connected with the push plate through the screw to push out the plastic part, so that the height of the die is effectively reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description 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 side cross-sectional view of the die assembly of the present invention;

FIG. 2 is a front cross-sectional view of the die assembly of the present invention;

FIG. 3 is a cover mold scheduling diagram of the present invention;

FIG. 4 is a moving die permutation map of the present invention;

FIG. 5 is a schematic view of a molded plastic part according to the present invention;

FIG. 6 is a schematic view of a cage.

In the figure: 1. a movable mould seat plate; 2. a movable mold fixing plate; 3. buckling machine; 4. a first small pull rod; 5. pushing the plate; 6. a push plate insert; 7. fixing a template; 8. a fixed die insert; 9. a first spring; 10. a limit pin; 11. a fixed mold half block; 12. bending a pin; 13. a bending pin fixing plate; 14. a hot nozzle fixing plate; 15. a hot runner plate; 16. a support plate; 17. a fixed die base plate; 18. a first screw; 19. a second screw; 20. a hot nozzle; 21. fixing a mold core; 22. a movable mold core; 23. a distance pull rod; 24. a third screw; 25. connecting columns; 26. a spiral cooling water pipe; 27. an air valve; 28. a second spring; 29. a first guide sleeve; 30. a first guide post; 31. positioning rings; 32. a second guide sleeve; 33. a third guide sleeve; 34. and a second guide post.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-6, a barrel part injection mold with a spiral groove comprises a movable mold base plate 1, a movable mold fixing plate 2 is fixedly connected to the top end of the movable mold base plate 1, a fastening machine 3 is fixedly connected to one side of the movable mold fixing plate 2, a push plate 5 is fixedly connected to the top end of the movable mold fixing plate 2, a fixed mold plate 7 is fixedly connected to the top end of the push plate 5, a push plate insert 6 is fixed to one side of the push plate 5, a fixed mold insert 8 is fixedly connected to the inner side of the fixed mold plate 7, a limit pin 10 is fixed to the inner side of the fixed mold plate 7, a first spring 9 is further arranged on the inner side of the fixed mold plate 7, a first spring 9 is arranged in a hole on one side of a fixed mold half huff block 11, a bent pin fixing plate 13 is fixedly connected to the top end of the fixed mold plate 7 through the limit pin 10, a fixed mold half huff block 11 is slidably connected to the inner side of the bent pin fixing plate 13, a bent pin 12 is fixedly connected to the inside of the bent pin fixing plate 13, and a hot nozzle fixing plate 14 is arranged on the top end of the bent pin fixing plate 13, the top of hot nozzle fixed plate 14 is provided with backup pad 16, the top of backup pad 16 is provided with fixed die bedplate 17, the inboard of backup pad 16 is provided with hot runner plate 15, the top fixedly connected with position circle 31 of hot runner plate 15, the bottom fixedly connected with hot nozzle 20 of hot runner plate 15, fixed die core 21 has been cup jointed in the outside of hot nozzle 20, fixed die core 21 is located the inboard of knee pin fixed plate 13, the inboard of fixed die insert 8 is provided with movable mould core 22, the inside fixedly connected with distance pull rod 23 of knee pin fixed plate 13 and fixed die plate 7 one side, the bottom of distance pull rod 23 is through third screw 24 fixedly connected with spliced pole 25, the inside fixedly connected with second spring 28 of knee pin 12 and fixed die plate 7, spiral condenser tube 26 has been seted up to movable mould core 22's inside, the inside of movable mould core 22 is provided with pneumatic valve 27.

The movable mould base plate 1 is connected with the movable mould fixing plate 2 through a screw;

a second guide post 34 is further arranged among the fixed die plate 7, the push plate 5 and the movable die fixing plate 2, a second guide sleeve 32 and a third guide sleeve 33 are sleeved on the outer side of the second guide post 34, the second guide sleeve 32 is positioned inside the fixed die plate 7, and the third guide sleeve 33 is positioned inside the push plate 5;

the inner parts of the supporting plate 16, the hot nozzle fixing plate 14 and the bent pin fixing plate 13 are fixedly connected with a first guide column 30, and the outer side of the first guide column 30 is sleeved with a first guide sleeve 29;

a first screw 18 and a second screw 19 are fixed in the fixed die base plate 17, the supporting plate 16, the hot nozzle fixing plate 14 and the bent pin fixing plate 13 are fixedly connected through the first screw 18, and the fixed die base plate 17, the supporting plate 16 and the hot nozzle fixing plate 14 are also connected through the second screw 19;

the fixed mold half block 11 drives the bent pin and bent pin fixing plate 13 to move through the bent pin 12.

An annular cooling water tank is arranged on the outer side of the fixed mold insert 8.

The device is applied to injection of barrel parts made of PP materials;

through the matching design of the hot nozzle fixing plate 14, the hot runner plate 15 and the hot nozzle 20, an integral hot runner casting system with two hot nozzles and fixed positions is formed, compared with a common casting system, the hot runner casting system is a technology of a thermoplastic injection mold, and has the advantages of simplifying the mold structure, shortening the molding period, stabilizing the change of melt temperature, saving raw materials, improving the product quality, ensuring the filling balance and the like;

the hot runner plate 15 is an open hot runner, and the hot nozzle 20 is an open hot nozzle;

during the injection molding process of the mold, the metal of the hot nozzle thermally expands. Therefore, the bulging size of the set of die hot-jet nozzle is as follows:

the calculation formula of the thermal expansion size of the thermal nozzle and the specific numerical value of the thermal expansion size of the thermal nozzle in this embodiment are as follows:

in the formula, the expansion length is calculated for all the heat nozzles to be used as reference;

length of hot nozzle at room temperature, unit: mm;

the working size of the hot nozzle, namely the length of the hot nozzle after temperature rise and expansion, unit: mm;

temperature difference between melt temperature and mold temperature, unit: DEG C;

the expansion coefficient of the material used for the heat shooting nozzle is generally taken;

the size of the positioning ring 31 is 100 multiplied by 34 multiplied by 12;

the fixed mold insert 8 is of a circular structure, so that the insert is convenient to process and cool, and meanwhile, the circular structure is designed to ensure the coaxiality of the inner cylinder and the outer cylinder of the plastic part;

four fixed mold half blocks 11 are arranged in the mold, so that the core can be pulled laterally conveniently, the front end of each fixed mold half block 11 is designed according to the size of 1/2 at the top end part of the plastic part, and the whole fixed mold half block 11 is in an irregular rectangular T-shaped plate shape;

the main working part of the fixed mold core 21 of the round barrel mold is the contact part with a plastic part, the top of a barrel part is round, so the working part of the fixed mold core 21 is round, the fixed mold core 21 and a bent pin fixing plate 13 are fastened by screws, and meanwhile, an annular cooling water channel is arranged around the fixed mold core 21, so the parts of the fixed mold core 21 except the fastening part are also designed into round shapes, and the processing and the installation of the water channel are convenient;

the whole of the push plate insert 6 is rectangular plate-shaped, and the top of the push plate insert 6 is matched with the fixed mold insert 8 to form a circular ring bulge, so that the plastic part can be pushed away and the edge of the plastic part can be molded conveniently;

the structural analysis of the barrel part can show that the movable mould core 22 of the barrel part only has a large core required by the deep cavity of the inner surface of the barrel part, the large wrapping force of the barrel part to the large core after the forming is large, the large core is arranged at the movable mould part of the mould, the fastening part at the bottom of the movable mould core 22 is convenient for processing and is designed into a circular shape, the part, which is carried in the movable mould core 22, of a connecting push plate and the part of the plastic part are designed into a circular table shape gradually close to the circular size of the top of the plastic part by combining the shape of the plastic part, and meanwhile, a hole is upwards formed in the movable mould core 22 and is convenient for the arrangement of a spiral cooling water pipe 26 and the installation of a pneumatic push-out device pipeline by matching with an air valve 27;

the top recess of cask finished piece adopts the side direction structure of loosing core, use cover half ha fu piece 11 to loose core, the process of loosing core is gathered and is controlled cover half ha fu piece 11 through bent pin 12, reset and locking, cover half ha fu piece 11 is fixed a position by first spring 9 and stop pin 10 after the mould die sinking, fix a position by the T type groove of cover half ha fu piece 11 self and fixed die plate 7 in the compound die, because the back-off at cask plastic part top is annular, so cover half ha fu piece 11 minimum loose core apart from the degree of depth that does not directly equal to the back-off, minimum loose core apart from finding with the mapping method, detailed process is as follows: the drawing method can obtain that the minimum core pulling distance of the barrel part is 7mm, and then the required safety distance is 3mm, so the core pulling distance of the fixed die half block 11 is 10mm of the limiting nail, and the core pulling distance requirement can be met because the thickness of the bent pin sliding block is larger;

in the embodiment, the mode of pushing out a plastic part by a push plate and pushing out the plastic part by pneumatic combination is adopted for demoulding, wherein the pneumatic demoulding is suitable for pushing out a deep cavity, a thin wall or soft plastic, the formed cylindrical plastic part is a deep cavity and a thin wall, and the effect is excellent by matching with the pneumatic pushing out, and the design finishes the gasification pushing of demoulding by injecting air inwards through an air valve 27;

in the push plate pushing process of the set of the mold, the push plate is pushed by an injection molding machine ejector rod connected to the mold connecting column 25 and is matched with pneumatic pushing to complete the pushing process of the plastic part together, and meanwhile, after the mold is subjected to one-time injection molding, the push plate is pulled back to the original position under the action of the injection molding machine ejector rod to complete the mold resetting process;

because the heat coefficient of water is large, the specific heat capacity is large, and the cost is low, normal-temperature water is selected as a cooling medium, and the film body cooling is completed by injecting the normal-temperature water into the spiral cooling water pipe 26 and the cooling circulation tank;

in the design, a positioning ring 31 is matched with an injection molding machine, joint positioning is carried out in the mold through the matching among a first guide sleeve 29, a first guide post 30, a second guide sleeve 32, a third guide sleeve 33 and a second guide post 34, and the lengths of the first guide sleeve 29, the first guide post 30, the second guide sleeve 32, the third guide sleeve 33 and the second guide post 34 are required to be adjusted according to actual requirements;

the positioning of the hot runner plate 15 adopts pin positioning and plate center pin positioning; the fixed mold core 21, the fixed mold insert 8 and the push plate insert 6 are respectively fastened by adopting corresponding screws and are matched with corresponding fixing plates for positioning;

the movable mold core 22 is matched with a fixed plate corresponding to the movable mold for positioning, and the matching among the inner mold inserts needs to adopt transition matching, so that absolute tightness is ensured, the movable mold core is not frequently disassembled, and the concentricity is better;

the hot nozzle 20 in the selected open type hot runner pouring system is connected with the opening part at the lower end of the positioning ring 31, the upper end of the positioning ring 31 is connected with an injection molding machine, the diameter of a runner of the hot nozzle 20 is 7mm, the top of the positioning ring 31 is connected with a runner opening of the injection molding machine, and the runner system realizes two-point-position glue feeding of a mold through the hot runner plate 15;

the specific implementation mode is as follows:

after the PP plastic is sheared and melted by an injection molding machine, the plastic melt firstly enters a hot runner plate 15 of a hot runner pouring system through a hot nozzle 20 of the hot runner pouring system to split two cavities, enters a die cavity through a flow passage in the injection molding machine, after injection is finished and a barrel workpiece is molded, a movable die plate of the injection molding machine pulls a movable die part of the die to move, under the action of the button machine 3, the fixed die plate 7, the push plate 5 and the movable die fixed plate 2 are fastened, the three plates are fastened, the button machine 3 is simultaneously matched and arranged on a second spring 28 to act together, so that the die is firstly opened from an I-I parting surface, at the moment, the bent pin 12 pulls the fixed die half block 11 to complete the lateral core pulling of the fixed die, the core pulling distance is controlled by the limit nail 10 and the bent pin 12, the first spring 9 prevents the sliding block from moving before die assembly, the die opening distance of the I-I parting surface is controlled by the distance pull rod 23, and the first die opening distance of the die design is forty millimeters. After reaching the first parting mold opening distance of forty millimeters, the movable mold part continues to move backwards under the action of the injection molding machine, after reaching a certain stroke, the button machine 3 is pulled open, because the adhesion force of the plastic part to the fixed mold insert 8 is far less than the wrapping force of the plastic part to the movable mold core 22, at the moment, the mold can be opened at the II-II parting surface, the second mold opening is realized, in order to ensure that the plastic part is taken out smoothly, the second mold opening distance is at least twice of the height of the plastic part and 10 millimeters, the requirement can be met, the mold opening distance is controlled by the injection molding machine, after the mold opening stroke is completed, the ejector pin push plate 5 and the push plate insert 6 of the injection molding machine, which are connected to the mold connecting post 25, the third mold opening is realized, simultaneously, the air valve 27 is pushed away by the release of high-pressure gas, the plastic part is pushed away from the movable mold core 22 together with the push plate 5 and the push plate insert 6, the push distance is controlled by the first small pull rod 4, and the mold completes one-time injection molding, after the pushing action is finished, the push plate 5 is pulled back to the original position under the action of the ejector rod of the injection molding machine, and the fixed die half block 11 is reset under the action of the bent pin 12.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a take cask spare injection mold of spiral groove, includes movable mould bedplate (1), its characterized in that: the top end of the movable mold base plate (1) is fixedly connected with a movable mold fixing plate (2), one side of the movable mold fixing plate (2) is fixedly connected with a button machine (3), the top end of the movable mold fixing plate (2) is fixedly connected with a push plate (5), the top end of the push plate (5) is fixedly connected with a fixed mold plate (7), one side of the push plate (5) is fixedly provided with a push plate insert (6), the inner side of the fixed mold plate (7) is fixedly connected with a fixed mold insert (8), the inner side of the fixed mold plate (7) is fixedly provided with a limit pin (10), the inner side of the fixed mold plate (7) is also provided with a first spring (9), the top end of the fixed mold plate (7) is fixedly connected with a bent pin fixing plate (13) through the limit pin (10), the inner side of the bent pin fixing plate (13) is slidably connected with a fixed mold half block (11), and the first spring (9) is installed in a hole on one side of the fixed mold half block (11), the inner part of the bent pin fixing plate (13) is fixedly connected with a bent pin (12), the top end of the bent pin fixing plate (13) is provided with a hot nozzle fixing plate (14), the top end of the hot nozzle fixing plate (14) is provided with a supporting plate (16), the top end of the supporting plate (16) is provided with a fixed die base plate (17), the inner side of the supporting plate (16) is provided with a hot runner plate (15), the top end of the hot runner plate (15) is fixedly connected with a positioning ring (31), the bottom end of the hot runner plate (15) is fixedly connected with a hot nozzle (20), the outer side of the hot nozzle (20) is sleeved with a fixed die core (21), the fixed die core (21) is positioned on the inner side of the bent pin fixing plate (13), the inner side of the fixed die insert (8) is provided with a die core (22), and the inner parts of one sides of the bent pin fixing plate (13) and the fixed die plate (7) are fixedly connected with a fixed distance pull rod (23), the bottom of distance pull rod (23) is through third screw (24) fixedly connected with spliced pole (25), the inside fixedly connected with second spring (28) of curved pin (12) and fixed die plate (7), spiral cooling water pipe (26) have been seted up to the inside of movable mould core (22), the inside of movable mould core (22) is provided with pneumatic valve (27).

2. The injection mold for barrel parts with helical grooves according to claim 1, wherein: the movable mould base plate (1) is connected with the movable mould fixing plate (2) through screws.

3. The injection mold for barrel parts with helical grooves according to claim 1, wherein: a second guide post (34) is further arranged among the fixed die plate (7), the push plate (5) and the movable die fixing plate (2), a second guide sleeve (32) and a third guide sleeve (33) are sleeved on the outer side of the second guide post (34), the second guide sleeve (32) is located inside the fixed die plate (7), and the third guide sleeve (33) is located inside the push plate (5).

4. The injection mold for barrel parts with helical grooves according to claim 1, wherein: the inner parts of the supporting plate (16), the hot nozzle fixing plate (14) and the bent pin fixing plate (13) are fixedly connected with a first guide column (30), and the outer side of the first guide column (30) is sleeved with a first guide sleeve (29).

5. The injection mold for barrel parts with helical grooves according to claim 1, wherein: the fixed die base plate (17) is internally fixed with a first screw (18) and a second screw (19), the fixed die base plate (17), the supporting plate (16), the hot nozzle fixing plate (14) and the bent pin fixing plate (13) are fixedly connected through the first screw (18), and the fixed die base plate (17), the supporting plate (16) and the hot nozzle fixing plate (14) are further connected through the second screw (19).

6. The injection mold for barrel parts with helical grooves according to claim 1, wherein: the fixed die half block (11) drives the bent pin and bent pin fixing plate (13) to move through the bent pin (12).

7. The injection mold for barrel parts with helical grooves according to claim 1, wherein: and an annular cooling water tank is arranged on the outer side of the fixed die insert (8).