CN106696195A

CN106696195A - Mould for preventing small nylon gear from generating flash and working method for mould

Info

Publication number: CN106696195A
Application number: CN201710048759.0A
Authority: CN
Inventors: 陈功振
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2017-01-23
Filing date: 2017-01-23
Publication date: 2017-05-24

Abstract

The invention relates to a mould for preventing a small nylon gear from generating flash and a working method for the mould. The mould comprises a fixed molding board, wherein a sprue bush is arranged at one side of the fixed molding board; a middle board assembly which can be parted from the fixed molding board is arranged at the other side of the fixed molding board; during mould closing, a sub runner which communicates with the sprue bush is formed between the middle board assembly and the fixed molding board; a plurality of middle board inserts are embedded into the middle board assembly; casting runners are formed in the middle board inserts; during mould closing, the casting runners communicate with the sub runner; a movable molding board which can be parted from the middle board assembly is arranged in the side direction of the middle board assembly; a plurality of insertion blocks which correspond to the middle board inserts are embedded into the movable molding board; ends, close to the middle board assembly, of the insertion blocks are higher than the movable molding board by 0.05 mm; during mould closing, mould cavities which communicate with the casting runners are formed between the insertion blocks and the middle board inserts; and a pushing mechanism for favorably pushing out workpieces is arranged in the side direction of the movable molding board. The mould is reasonable in design, effectively avoids occurrence of injection-molding flash of the small nylon gear, and is high in production efficiency.

Description

A kind of mould for preventing small-sized nylon gear overlap from producing and its method of work

Technical field：

The present invention relates to a kind of mould for preventing small-sized nylon gear overlap from producing and its method of work.

Background technology：

Small-sized nylon gear is usually used in small-sized transmission mechanism because it has good running in performance, and small-sized nylon gear leads to Frequently with injection moulding, but in traditional small-sized nylon gear injection mold, small-sized nylon gear has injection and flies during production The generation on side, this has had a strong impact on the profile accuracy of small-sized nylon gear, it is therefore desirable to the follow-up processing for carrying out being molded overlap again, This not only greatly reduces production efficiency, and increased production cost.

The content of the invention：

It is an object of the invention to be directed to above weak point, there is provided a kind of mould for preventing small-sized nylon gear overlap from producing and Its method of work, it is not only reasonable in design, the generation that small-sized nylon gear is molded overlap is prevented effectively from, and also production efficiency is high.

To achieve these goals, the technical solution adopted by the present invention is：One kind prevents small-sized nylon gear overlap from producing Mould, including solid plate, the side of the solid plate is provided with sprue bush, and the opposite side of solid plate is provided with can be with solid plate parting Middle board component, during matched moulds in the middle of formation is communicated with sprue bush between board component and solid plate runner, the intermediate plate Some intermediate plate mold inserts are embedded with component, a cast runner are offered on the intermediate plate mold insert, during matched moulds a cast runner with point Runner is communicated, and the lateral of the middle board component is provided with and can be embedded on the moving platen with the moving platen of middle board component parting There are some inserts corresponding with intermediate plate mold insert, the insert is higher by moving platen 0.05mm, matched moulds near intermediate plate assembly end When the die cavity that is communicated with a cast runner of formation between insert and intermediate plate mold insert, the lateral of the moving platen be provided with profit release work The ejecting mechanism of part.

Further, the middle board component includes the mold insert seat board and mold insert cover plate that are fixedly connected via screw, described Some first through hole for coordinating with intermediate plate mold insert are offered on mold insert seat board, the first through hole is near mold insert cover plate end An annular recess is provided with, the outer circumference surface of the intermediate plate mold insert is provided with the annular flange for coordinating with annular recess；It is described Some the second through holes passed through with sharp intermediate plate mold insert are offered on mold insert cover plate, second through hole coaxially sets with first through hole Put.

Further, the runner communicates shunting main stem with sprue bush including four, and four shunting main stems are in cross Distribution, it is each shunting main stem be communicated with some shunting byroads, during matched moulds it is each shunting byroad respectively with an intermediate plate mold insert on A cast runner communicate.

Further, the lateral supporting plate being sequentially connected and Bottom clamp plate of the moving platen, the ejecting mechanism includes In supporting plate and can along its inwall move push rod fixed plate, be fixed with through supporting plate and stretch in the push rod fixed plate Enter in insert with the push rod of workpiece after profit ejection shaping, push rod fixed plate has push pedal, the push pedal laterally through mode connects for screw It is laterally attached have with profit drive its move top rod, backing plate is provided between push pedal and Bottom clamp plate.

Further, the push rod fixed plate, release link is equipped between supporting plate and moving platen；It is solid in the push pedal Surely there is the sprue puller for sequentially passing through push rod fixed plate, supporting plate and insert.

Further, the opposite side of the solid plate has top clamping plate via mode connects for screw, is opened up on the top clamping plate There is cooling water channel, fast spigot joint is connected with the opening of the cooling water channel；One side of the top clamping plate be fixed with according to It is secondary through middle board component and the guide pillar of moving platen.

Further, the side of the top clamping plate is provided with horizontal controlled interval pull rod, one end outside of the controlled interval pull rod A spacing block set is provided with, the side of the middle board component is fixed with a limit base, the spacing block set can prop up limit when dividing mould The side of position seat.

A kind of method of work of the mould for preventing small-sized nylon gear overlap from producing of the present invention, comprises the following steps：

（1）Injection：Melt injects along sprue bush, through in runner and a cast runner injection die cavity, note being formed after pressurize, cooling Modeling workpiece；

（2）The demoulding：Solid plate and middle board component parting first, when the spacing block set in parting to controlled interval pull rod props up limit base When, middle board component and moving platen parting, spot pouring mouth are pulled off, and injection-molded work is released die cavity by ejecting mechanism；

（3）Matched moulds：Solid plate is moved to and forms runner with intermediate plate attached components, and then solid plate drives middle board component to move Move to moving platen and connect, die cavity is formed between insert and intermediate plate mold insert, complete matched moulds, poured into a mould next time.

Compared with prior art, the present invention has the following effects that：Reasonable in design of the present invention, in small-sized nylon gear note Being moulded during type can be prevented effectively from the generation of injection overlap, greatly improve the tooth form after small-sized nylon gear injection moulding Precision, production efficiency is high, low production cost.

Brief description of the drawings：

Fig. 1 is the structural representation of the embodiment of the present invention；

Fig. 2 is A in Fig. 1 to structural representation；

Fig. 3 is B in Fig. 1 to structural representation；

Fig. 4 is the ejecting structure schematic diagram one of injection-molded work in the embodiment of the present invention；

Fig. 5 is the ejecting structure schematic diagram two of injection-molded work in the embodiment of the present invention.

In figure：

1- solid plates；2- sprue bush；Board component in the middle of 3-；301- mold insert seat boards；302- mold insert cover plates；4- intermediate plate mold inserts； 401- annular flanges；5- runners；501- shunts main stem；502- shunts byroad；6- a cast runners；7- moving platens；8- inserts；9- Die cavity；10- supporting plates；11- Bottom clamp plates；12- push rod fixed plates；13- push rods；14- push pedals；15- pushes up rod；16- backing plates；17- Top cover；The bodies of 171- first；The bodies of 172- second；The bodies of 173- the 3rd；18- release links；19- sprue pullers；20- top clamping plates； 21- cooling water channels；The fast union nipples of 22-；23- guide pillars；24- controlled interval pull rods；241- spacing block sets；25- limit bases.

Specific embodiment:

The present invention will be further described in detail with reference to the accompanying drawings and detailed description.

As Figure 1-4, a kind of mould for preventing small-sized nylon gear overlap from producing of the present invention, including vertically arranged determine Template 1, the side of the solid plate 1 is provided with sprue bush 2, and the opposite side of solid plate 1 is provided with can be with the intermediate plate of the parting of solid plate 1 Component 3, the runner 5 that formation is communicated with sprue bush 2 between centre board component 3 and solid plate 1 during matched moulds, the middle board component Some intermediate plate mold inserts 4 are embedded with 3, a cast runner 6 are offered on the intermediate plate mold insert 4, during matched moulds a cast runner 6 with point Runner 5 is communicated, the middle board component 3 it is lateral be provided with can with the moving platen 7 of the parting of middle board component 3, on the moving platen 7 Some inserts 8 corresponding with intermediate plate mold insert 4 are embedded with, the insert 8 is higher by moving platen near the centre end of board component 3 0.05mm, the die cavity 9 that formation is communicated with a cast runner 6 between insert 8 and intermediate plate mold insert 4 during matched moulds, the side of the moving platen To be provided with profit release workpiece ejecting mechanism.

In the present embodiment, the middle board component 3 includes the mold insert seat board 301 and mold insert cover plate that are fixedly connected via screw 302, some first through hole for coordinating with intermediate plate mold insert 4 are offered on the mold insert seat board 302, the first through hole is leaned on The nearly end of mold insert cover plate 302 is provided with an annular recess, and the outer circumference surface of the intermediate plate mold insert is provided with for coordinating with annular recess Annular flange 401；Some the second through holes passed through with sharp intermediate plate mold insert 4, described are offered on the mold insert cover plate 302 Two through holes are coaxially disposed with first through hole, it is ensured that the registration of intermediate plate mold insert 4, firm, raising injection moulding precision.

In the present embodiment, the runner 5 communicates shunting main stem 501, four shunting main stems with sprue bush 2 including four 501 is in crossing distribution, and each shunting main stem 501 is communicated with some shunting byroads 502, each 502 points of byroad of shunting during matched moulds Do not communicated with a cast runner on an intermediate plate mold insert 4；The mould uses a multi-cavity mold injection moulding, and production efficiency is high, and The small-sized nylon gear of plurality of specifications can be produced in order to once be molded, different size specification is embedded in the present embodiment on moving platen Insert, is embedded the intermediate plate mold insert corresponding with insert on middle board component.

In the present embodiment, the lateral supporting plate 10 being sequentially connected and Bottom clamp plate 11 of the moving platen 7, the kickoff mechanism The push rod fixed plate 12 that structure includes in supporting plate 10 and can be moved along its inwall, is fixed with the push rod fixed plate 12 and wears Cross supporting plate 10 and stretch into insert 8 with the push rod 13 of workpiece after profit ejection shaping, push rod fixed plate 12 laterally through screw Push pedal 14 is connected with, the laterally attached of the push pedal 14 has the top rod 15 for driving it to move with profit, push pedal 14 and Bottom clamp plate 11 Between be provided with backing plate 16；Top rod 15 is connected with forcing press.

In the present embodiment, the gear relatively thin for transverse tooth thickness, in order to reduce the damage of gear teeth face, is slidingly connected on push rod 13 There is a top cover 17, the top cover 17 includes 171, second set of the first body being sequentially connected along stripping direction and diameter successively decreases successively The body 173 of body 172 and the 3rd, first body 171 is round platform end, and the shape of the second body 172 and the 3rd body 173 is equal It is hollow cylinder, push rod 13 first ejects middle board component 3 during the demoulding, so that middle board component 3 and the parting of moving platen 7, connect The side that push rod 13 props up the first body 171, push rod 13 promotes top cover 17 to move together, in moving process, using second Cascaded surface between the body 173 of body 172 and the 3rd props up the end face of gear, and gear is ejected, and realizes the demoulding, as shown in Figure 5.

In the present embodiment, the push rod fixed plate 12, release link 18 is equipped between supporting plate 10 and moving platen 7；Institute State and the sprue puller 19 for sequentially passing through push rod fixed plate 12, supporting plate 10 and insert 8 is fixed with push pedal 14.

In the present embodiment, the opposite side of the solid plate 1 has top clamping plate 20, the top clamping plate 20 via mode connects for screw On offer cooling water channel 21, fast spigot joint 22 is connected with the opening of the cooling water channel 21；The top clamping plate 20 One side is fixed with the guide pillar 23 for sequentially passing through middle board component 3 and moving platen 7.

In the present embodiment, the side of the top clamping plate 20 is provided with horizontal controlled interval pull rod 24, the controlled interval pull rod 24 One end outside is provided with a spacing block set 241, and the side of the middle board component 3 is fixed with a limit base 25, limit when dividing mould Position projection 241 can prop up the side of limit base 25.

In the present embodiment, in order to prevent moving platen 7 from deforming, do not quenched during processing moving platen.

（1）Injection：Melt injects along sprue bush 2, is injected in die cavity 9 through runner 5 and a cast runner 6, the shape after pressurize, cooling Into injection-molded work；

（2）The demoulding：Solid plate 1 and the middle parting of board component 3 first, when the spacing block set 241 in parting to controlled interval pull rod 24 is supported Firmly during limit base 25, middle board component 3 and the parting of moving platen 7, spot pouring mouth are pulled off, and ejecting mechanism is by injection-molded work pushing out type Chamber；

When ejecting mechanism releases injection-molded work：A, push rod 13 directly eject injection-molded work under the driving of push pedal 14；If b, top When the movable sleeve of bar 13 is provided with a top cover 17, push rod 13 is first to be slided along top cover 17 under the driving of push pedal 14 and promotes intermediate plate group Part 3 and the parting of moving platen 7, spot pouring mouth are pulled off, and then push rod 13 drives the synchronizing moving of top cover 17, and top cover 17 is by injection-molded work top Go out die cavity；

（3）Matched moulds：Solid plate 1 is moved to and connects to forming runner 5 with middle board component 3, and then solid plate 1 drives intermediate plate group Part 3 is moved to and connects with moving platen 7, and die cavity 9 is formed between insert 8 and intermediate plate mold insert 7, completes matched moulds, is poured next time Note.

The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with Modification, should all belong to covering scope of the invention.

Claims

1. a kind of mould for preventing small-sized nylon gear overlap from producing, it is characterised in that：Including solid plate, the one of the solid plate Side is provided with sprue bush, the opposite side of solid plate be provided with can with the middle board component of solid plate parting, during matched moulds in the middle of board component with The runner that formation is communicated with sprue bush between solid plate, is embedded with some intermediate plate mold inserts on the middle board component, described A cast runner is offered on intermediate plate mold insert, a cast runner is communicated with runner during matched moulds, the lateral of the middle board component sets Having can be embedded with some inserts corresponding with intermediate plate mold insert with the moving platen of middle board component parting on the moving platen, The insert is higher by moving platen 0.05mm near intermediate plate assembly end, is formed and cast between insert and intermediate plate mold insert during matched moulds The die cavity that runner is communicated, the lateral of the moving platen is provided with the ejecting mechanism that workpiece is released with profit.

2. a kind of mould for preventing small-sized nylon gear overlap from producing according to claim 1, it is characterised in that：In described Between board component include the mold insert seat board and mold insert cover plate that are fixedly connected via screw, offer some being used on the mold insert seat board The first through hole coordinated with intermediate plate mold insert, the first through hole is provided with an annular recess, the centre near mold insert cover plate end The outer circumference surface of plate mold insert is provided with the annular flange for coordinating with annular recess；Offered on the mold insert cover plate some with profit The second through hole that intermediate plate mold insert is passed through, second through hole is coaxially disposed with first through hole.

3. a kind of mould for preventing small-sized nylon gear overlap from producing according to claim 1, it is characterised in that：Described point Runner communicates shunting main stem with sprue bush including four, and four shunting main stems are in crossing distribution, and each shunting main stem is communicated with Some shunting byroads, each shunting byroad is communicated with a cast runner on an intermediate plate mold insert respectively during matched moulds.

4. a kind of mould for preventing small-sized nylon gear overlap from producing according to claim 1, it is characterised in that：It is described dynamic The lateral supporting plate being sequentially connected and Bottom clamp plate of template, the ejecting mechanism include in supporting plate and can be along its inwalls Mobile push rod fixed plate, is fixed with through supporting plate in the push rod fixed plate and stretches into insert with work after profit ejection shaping The push rod of part, push rod fixed plate has a push pedal laterally through mode connects for screw, the push pedal it is laterally attached have with profit drive its to move Dynamic top rod, is provided with backing plate between push pedal and Bottom clamp plate.

5. a kind of mould for preventing small-sized nylon gear overlap from producing according to claim 4, it is characterised in that：The top Bar fixed plate, release link is equipped between supporting plate and moving platen；Be fixed with the push pedal sequentially pass through push rod fixed plate, The sprue puller of supporting plate and insert.

6. a kind of mould for preventing small-sized nylon gear overlap from producing according to claim 1, it is characterised in that：It is described fixed The opposite side of template has top clamping plate via mode connects for screw, and cooling water channel, the cooling water channel are offered on the top clamping plate Opening at be connected with fast spigot joint；One side of the top clamping plate is fixed with and sequentially passes through middle board component and moving platen Guide pillar.

7. a kind of mould for preventing small-sized nylon gear overlap from producing according to claim 1, it is characterised in that：It is described fixed The side of die holder plate is provided with horizontal controlled interval pull rod, and one end outside of the controlled interval pull rod is provided with a spacing block set, the centre The side of board component is fixed with a limit base, and the spacing block set can prop up the side of limit base when dividing mould.

8. a kind of method of work of the mould for preventing small-sized nylon gear overlap from producing, it is characterised in that：Including using such as right It is required that a kind of mould for preventing small-sized nylon gear overlap from producing of any one described in 1~7, comprises the following steps：