CN204736393U - A mould for making plastic part including part system of punching a hole - Google Patents

Abstract

The utility model relates to a make the plastic part including the parts systematic mould that punches a hole, this mould 1 includes first component 3 and second component 4, these two components constitute the die cavity 5 corresponding to the parts of waiting to make 2 when the mould is in closed position, in this mould, the second component includes that at least one can be for the second component at the drift 6 that regain activity between position and the stretching position in the die cavity, in this mould: first component including can for first component activity and with 6 coaxial recoils first 7 of drift, activity drift 6 can run through the die cavity and in first 7 of recoil gets into first components, activity recoil first 7 is connected with servo mechanism, and this servo mechanism exerts than drift 6 in the counter -force that power is little that recoils and exert on first 7 for contain these two drifts 6, plastics between 7 can be when drift 6 moves to its stretching position compressed then punched a hole. (Pbpnum='1' /)

Description

For the manufacture of the mould comprising parts punching system of plastic components

Technical field

The utility model relates to the technical field manufacturing plastic components by being molded, especially comprising the parts of perforate.

Background technology

Especially, above-mentioned parts can be (but being not limited to) vehicle structure parts, face, beater or beat-up and floor etc. before such as technology.

The feature of the parts of this type is to comprise the perforate run through, and also must keep good mechanical strength simultaneously.

In order to manufacture plastic components, known use mechanography, such as compression molded and/or injection-molded and/or compression moulding.

It is generally that moving element (being activated by press) by mould realizes relative to the movement of the retaining element of mould that the hot compression of pressurizeing in a mold is molded, and these elements are formed from steel usually.

Generally speaking, the loading surface (" plan dechargement ") be made up of plastic sheet is arranged in compression mould, wherein said plastics are generally composite, this composite is such as heat cured, such as SMC (deriving from English " sheet moulding compound ", i.e. sheet molding compound).

Then press is activated with close die.In other words, mould declines (closing) until closing position.

Then continue to activate press, so that molded pressure is passed to plastics.In other words, mould is in compression stage.Plastics therefore, it is possible to flowing, and are shaped to the shape of mould cavity.

Finally, in so-called " roasting " stage, plastics polymerization reaction take place, to form final parts.

In order to manufacture perforate in final parts, can expect that design has the mould of perforate die cavity (being namely provided with local molded shape for each perforate).Such as, mould can comprise and is positioned at drift on die cavity periphery and not relative with loading surface, and this drift is located on the mould element that can contact with another mould element when mould closes, and has the shape of desired perforate.

But when plastic flow, reinforcing fibre preferentially carrys out orientation according to the direction of flowing, and therefore reinforcing fibre can be wound around drift, is then interconnected to constitute again cementing line (ligne derecollement).Therefore, expect that the uniform fiber-wall-element model of Stochastic sum obtained is no longer controlled to obtain isotropic mechanical performance.This causes the specific orientation of reinforcing fibre, thus may cause the local anisotropy of parts, and therefore parts can have different mechanical performances according to Impact direction difference, and this can cause robustness not reach demand in some region of final parts.In fact, cementing line generally comprises less reinforcing fibre again, or does not comprise reinforcing fibre.

Therefore, in order to obtain the plastic components comprising the perforate run through, general first molded plastic part, doing over again after it being taken out from mould manufactures perforate with other equipment again, such as, by processing or form in desired position punching the perforate run through.

Therefore, except molding equipment, required production equipment must comprise the machining cell be integrated in the parts manufacturing cycle.This equipment price costliness also extends cycle time, also causes producing the surplus material and dust that come from the material cut.Further, this molded after reprocessing operation be not too applicable to (in shape and in appearance) and accurately manufacture perforate.

In order to avoid this reprocessing step, known a kind of mould that can manufacture molded perforate by means of active compression drift.These drifts are activated by hydraulic cylinder.These drifts are after plastic flow but drop to before polymerization in die cavity.

But this original place molding-system in use weares and teares too much, this is because drift can clash into the surface of mould corresponding thereto, and rub with the reinforcing fibre that can wear and tear.Therefore, drift and mould are all impaired.

In order to not damage these drifts, known a kind of technology, this technology is, when mould is in the close position, between drift and the surface of mould corresponding thereto, to reserve minimum clearance.Regulate to retain minimum range between these two parts of mould to this minimum clearance, this adjustment considers the Production deviations (such as 0.5mm) of component thickness, especially when component thickness is minimum.Thus, material is not pushed completely extrusion on thickness, thus leaves material residues layer in the bottom of perforate.Then, in additional production stage, this remnant layer is removed.When molded, there is the thickness deviation of institute's moulding part, change that is that occur is relevant according to the different of parameter (amount etc. of such as used material) for this thickness deviation and industrial process.So consider the change of the density of material, weight used and compressor operation situation, therefore the remnant layer with the thickness do not repeated among different components can change between 0.2 to 0.7mm.Therefore, large mechanical action must be set and remove this remnant layer.Such as, may must use can bore a hole, the jumbo of grinding or milling.Further, these equipment comprise the instrument (drill bit, emery wheel, milling cutter) must regularly replaced due to wearing and tearing or breakage.Finally, these instruments can with the problem with apertures in alignment to be molded.

In order to avoid damaging movable ram, also known a kind of mould, the position that this mould is relative with movable ram in die cavity comprises interchangeable wearing piece (this wearing piece is also sometimes referred to as " fixing recoil head "), and this wearing piece can be taken out and replace when it too damages from mould.This solution allows the thickness tolerance (+0.3mm/-0.2mm) not considering to be molded.But the remaining lamellae (being approximately 0.1mm) comprising reinforcing fibre still exists, therefore still need to remove this remaining lamellae by means of such as sandblasting, brush or round file etc. in artificial reprocessing.

Thus, existing compression drift leaves the remnant layer that thickness can change between 0.1mm to 0.3mm (even 0.7mm).In fact, for compression molded, when the compression direction of movable ram is identical with the closing direction of mould, remnant layer is generally greater than 0.3mm (thickness tolerance is+0.3mm/-0.2mm).Along with punch diameter increases, the thickness of remnant layer also can be larger, this is because reinforcing fibre when being difficult to remove compression between movable ram and punch.

Therefore, all there is the remnant layer of variable thickness in no matter which kind of scheme in the bottom of perforate when leaving mould.This remnant layer must be removed by manual method, and production is slowed down for this and production cost increases.In addition, the technology for removing these remnant layers causes perforate to be out of shape.

Utility model content

The purpose of this utility model is that this punching system does not leave any remnant layer in aperture bottom by providing a kind of mould with the punching system of optimization to solve above-mentioned defect.

Thus, theme of the present utility model relates to a kind of mould for the manufacture of plastic components, this mould comprises the first element and the second element, these two elements form the die cavity corresponding to parts to be manufactured when mould is in the close position, in this mould, the second element comprises at least one can relative to the drift of the second element activity between retrieving position and the extended position in die cavity.According to the utility model:

-the first element comprises recoil head that can be movable and coaxial with drift relative to the first element;

-movable ram can run through die cavity and relatively stretch in the first element with recoil head;

-movable recoil head is connected with servomechanism installation, the counter-force that the power that this servomechanism installation applies to be applied on recoil head than drift is little, and the plastics be included between these two drifts can be compressed when its extended position shifted to by drift, then by punching.

Can punching while compression plastics according to mould of the present utility model, allow to produce very thin remnant layer, this remnant layer is thinned to and is easy in a mold to its punching press, and therefore, it is possible to is removed by these automated process.

In addition, this mould ideally meets hole in size and apparent quality.

This mould is suitable for the molded of automotive component such as rear tailgate or floor etc. especially, and is generally suitable for any parts needing straight-through perforate (not relevant with fixing drift bonding again).

According to an example, servomechanism installation can apply to approximate greatly the counter-force of 50% of the power that drift applies on recoil head.

Advantageously, the head that recoils can protrude on extended position in die cavity.

Preferably, the radius of recoil head is greater than the radius of drift.Such as, the radius of recoil head can at least 0.05mm larger than the radius of drift.

Advantageously, drift is resisted against the surface on plastics and/or the head surface be resisted against on plastics of recoiling can be chromium plating.

According to an embodiment, pilot punch in the first wear sleeve, and recoil head can be guided in the second wear sleeve.

According to an example, servomechanism installation can be hydraulic cylinder or pneumatic cylinder.

Accompanying drawing explanation

The accompanying drawing provided by reading exemplarily, the utility model will become apparent not in any limiting sensely.In the drawings:

-Fig. 1 shows one according to mould of the present utility model, and this mould is in the close position and be in the filling of plastics and/or the step of flowing;

-Fig. 2 shows one according to mould of the present utility model, this mould in the close position and be in movable ram decline step;

-Fig. 3 shows one according to mould of the present utility model, this mould in an open position and be in movable ram retreat step;

-Fig. 4 shows one according to mould of the present utility model, and this mould is in an open position and be in the aeration step of punching clout sheet (pastille).

Detailed description of the invention

Referring now to Fig. 1 to Fig. 4, those figures show the mould 1 according to the parts 2 for the manufacture of being made up of plastics MP of the present utility model.Based on Fig. 1 to Fig. 4, mould 1 is described below.

Mould 1 comprises the first element 3 and the second element 4 with the first elements relative, and according to the example of Fig. 1 to Fig. 4, the first element is fixed, and the second element is then movable.These two elements form the die cavity 5 corresponding to parts 2 to be manufactured when mould 1 is in the close position.

Closing position is defined as when moving element 4 declines, moving element 4 and the primary importance be introduced into when contacting for the plastics MP of moulding part 2 in mould.Therefore, when closed beginning, between two elements 3,4 of mould 1, there is the space (not having the volume of material) needed for compression stage.

Second element 4 comprises at least one can relative to the drift 6 of the second element 4 activity between retrieving position and the extended position in die cavity 5.So-called " drift " refers to any parts that can form perforate molded shape to final parts 2, and therefore drift can have any possible shape (circular, square, oval etc.).It is such as metal cylindrical bar that drift is generally.

First element 3 comprises can relative to the recoil of the first element 3 activity 7.This recoil 7 is relative with drift 6 and coaxial with drift 6.

Movable ram 6 is connected with the servomechanism installation 8 ' that movable ram 6 can be made relative to the second element 4 movement.This servomechanism installation is such as pneumatic cylinder or hydraulic cylinder.

By means of servomechanism installation 8 ', movable ram 6 can run through die cavity, and enters in the first element 3 at recoil 7 place, and namely take in space while movement in recoil 7 in the first element 3, movable ram is also moving.

Movable recoil 7 is connected with servomechanism installation 8, and this servomechanism installation applies counter-force, and this counter-force is less than the power of drift 6 to recoil 7 applying, and therefore the plastics MP be included in when its extended position shifted to by drift 6 between two drifts 6,7 can be compressed, then by punching.

Drift 6 can relative to the second element 4 with the mode activity of translation: as shown in drawings, the closing direction that this drift 6 is suitable for such as along mould 1 in the second element 4 slides.According to an embodiment, drift 6 is directed in the bore hole of the second element 4.Preferably, drift 6 is directed in the first fixing wear sleeve 9.This can facilitate the attended operation of mould, and allows to adjust drift/sleeve better, thus the risk of limiting material infiltration, this infiltration may produce burr or the movable part of mould is blocked on parts.

Drift 6 comprises surperficial 6a, and this surface formation is resisted against the surface on the plastics MP in mould cavity 5.Drift 6 abutment surface 6a distance retaining element 3 farthest time residing position be called as " retrieving position ".At this retrieving position, surperficial 6a is preferably concordant with that surface of the second component 4 forming die cavity 5, in order to avoid change the volume of the die cavity of mould 1.

On the contrary, drift 6 abutment surface 6a distance the second element 4 farthest time residing position be called as " extended position ".In fact, at this extended position, surperficial 6a has passed die cavity 5 and has been arranged in the first element 3.

The radius of drift 6 is substantially equal to, be preferably slightly less than the radius being desirably in the perforate that parts 2 obtain.But perforate can have and is different from cylindrical shape.In this case, drift has the shape being suitable for hole shape.

Recoil 7 relative to the first element 3 with the mode activity of translation: as shown in drawings, the closing direction that this recoil head is suitable for such as along mould 1 in the first element 3 slides.According to an embodiment, recoil 7 is directed in the bore hole of the first element 3.Preferably, recoil 7 is directed in the second fixing wear sleeve 10.This can facilitate the attended operation of mould, and allows to adjust drift/sleeve better, thus restriction plastics (such as SMC resin) infiltration forms the risk of burr.

According to the utility model, this second wear sleeve 10 also plays the effect of the punching concave die of plastics MP.Therefore, advantageously, the sleeve be made up of abrasion-resistant stee is selected, to limit the wearing and tearing caused by stiffener (glass fibre, carbon fiber etc.).Equally advantageously, the second sleeve 10 comprise close to 90 ° enter (entering for drift 6) interior angle.The inside of this sleeve is recoil 7 part of sliding wherein.This angle is " profit " (vif) angle, is namely substantially equal to 90 °, to realize cutting, clean punching.

Recoil 7 comprises surperficial 7a, and this surface formation is resisted against the surface on the plastics MP in mould cavity 5.Recoil 7 abutment surface 7a distance retaining element 3 farthest time residing position be called as " extended position ".At this extended position, surperficial 7a preferably protrudes, so that the discharge of punching press plastics clout sheet 11 out during punching relative to that surface of the first element 3 forming die cavity 5.In fact, complete after punching and polymerization terminate, mould 1 is opened, and parts are withdrawn from, and then recoil 7 recovers origin-locations.Owing to being protruding, recoil head drains the punching clout stayed on its surperficial 7a.Equally feasiblely, surperficial 7a is concordant with that surface of the first element 3 forming die cavity 5, in order to avoid change the volume of the die cavity of mould 1.

On the contrary, recoil 7 abutment surface 7a distance the second element 4 farthest time residing position be called as " retrieving position ".At this retrieving position, surperficial 7a gets back in the first element 3.

The radius of recoil 7 is greater than the radius of drift 6, such as at least large 0.05mm (to avoid drift 6 and the second barrel contacts) slightly, but this semidiameter is less than 0.5mm (to guarantee good punching).Coaxial error between the drift 6 and 7 that this semidiameter allows absorption to be carried by two elements 3,4 of mould, thus guarantee: simultaneously

-drift 6 both can not disturb and does not too much frictionally insert in sleeve 10 to realize punching yet;

-play is still small, makes the punching effect between drift 6 and sleeve 10 produce clean cutting.

This coaxial tolerance is farthest reduced when manufacturing/regulating mould 1.The details of Fig. 2 shows this tolerance concept TO.

Recoil 7 carrys out servo by servomechanism installations such as such as hydraulic cylinders.This servomechanism installation 8 applies counter-force F2, this counter-force be less than by drift 6 be applied to recoil head on power F1.This counter-force preferably approximates greatly drift 6 to 50% of recoil 7 power applied.

Therefore, due to the existence of this counter-force, drift 6 continues compressed package and is contained in plastics MP between two drifts 6,7 between its decrement phase.

Then, when abutment surface 6a leaves to enter the first element 3 from die cavity 5, plastics are by successful punching.

Preferably, in abutment surface 6a, 7a of movable ram 6,7, at least one is chromium plating, to limit the adhesion of the plastics MP clout sheet produced by punching.

Finally, significantly, mould 1 comprises the quantity drift identical with the quantity of the perforate that parts 2 comprise 6, and therefore comprises the recoil relative with each drift 67 of equal number.

According to the working condition of mould 1 of the present utility model by Fig. 1 to Fig. 4 illustrate.

fig. 1

At mold closing step, moving element 4 declines (close) towards the first element 3.Then, plastics MP is compressed, and flows subsequently in die cavity 5.During these operations, drift 6 is in retrieving position, and its abutment surface 6a is concordant with the wall that moving element 4 forms die cavity 5.Recoil 7 is in extended position, and the wall that its abutment surface 7a forms die cavity 5 relative to retaining element 3 protrudes about 0.2mm a little.Caused by the position of slightly being protruded by this is insignificant to the interference of plastic flow.Finally, plastics MP starts polymerization reaction take place.

fig. 2

After plastics MP is polymerized, or preferably between plastics MP polymerization period, drift 6 drops in die cavity 5, and applies power F1 being included on the plastics MP between drift 6 and recoil 7, thus this power F1 is also applied in recoil 7.

The thickness of the plastics that the stroke that drift 6 declines corresponds in mould adds the given sub-line journey in retaining element 3.For the parts 2 of thickness approximately between 2.5mm to 5mm, the shift motion of drift 6 in die cavity 5 2mm larger than the local thickness of parts.That is, due to the relatively existence of a recoil of putting 7, drift 6 stretches into 2mm in the first element 3.

Drop to its final position (in retaining element 3 2mm) period at drift 6, recoil 7 applies axial force F 2 in the opposite direction, and retreats about 2mm because power F2 is set to about 50% of power F1 simultaneously.

This counter-force can compress the plastics MP between two drifts 6,7, to lose less material, especially obtains punching clout sheet 11 thin as far as possible, can be discharged from mould 1 by punching clout sheet by simple mechanism (such as air blast).In final position, drift 6 pairs of parts 2 complete punching, and institute's punching press thin plastics clout sheet 11 is out between drift 6,7.

At the end of the roasting (polymerization) of plastics, and before mould 1 is opened, by means of the pressure increased in hydraulic cylinder, the F2 that exerts all one's strength increases within the short time (such as 1 second).According to an example, at this moment power F2 approximately becomes the twice of power F1.Caused the back and forth movement of recoil 7 and drift 6 by the value of alternately change power F2, to improve the shearing to remaining reinforcing fibre, the clout sheet 11 that these remaining reinforcing fibres may produce punching link together with the remainder of parts 2.

fig. 3

Drift 6 comes back to its original position.Then, in mould 1 opening steps, moving element 4 and the first element 3 space out.

fig. 4

After mould 1 is opened, will to be molded and the parts 2 at least one hole that has been stamped are discharged from mould 1, then to have shifted out mould 1.Recoil 7 comes back to its original position.

Then air blast is carried out, to remove the remaining burr in die cavity 5.This air blast can also remove the clout sheet 11 corresponding to each hole stamped out.This air blast can be realized by clamping robot, and this robot carries compressed air by means of nozzle.

Can be used to manufacture plastics (MP) parts 2, Fig. 1 to Fig. 4 comprising at least one perforate according to mould 1 of the present utility model and show the working condition of mould 1 in this manufacture process.Therefore, this manufacture process at least comprises the following steps:

A) plastics MP is arranged in the die cavity 5 of mould 1;

B) close die 1, to compress the plastics MP in (Fig. 1) die cavity 1 (Fig. 1);

C) after plastics MP flows and between its polymerization period, by make drift 6 decline (Fig. 2) through die cavity 5 then enter in retaining element 3 to polymerization plastics MP carry out punching, recoil 7 also declines, on drift 6, apply axial force F 2, the power F2 specific force F1 contrary with the power F1 direction that drift 6 applies little simultaneously;

D) mould 1 (Fig. 3) is opened, discharge member 2; And,

E) such as from mould 1, remove by means of air blast (Fig. 4) the clout sheet 11 being derived from punching.

For injection mold, there is not step a), and step b) be close die 1 and in die cavity 5 injection of plastic MP.

As the step making drift 6 and recoil 7 recover its initial positions, can repeatedly step c), to carry out good punching to parts 2.These repetitions are carried out at polymerization stage, and therefore punching step carries out in cover time (temps masqu é), thus the manufacture process of the parts 2 that can not slow down.

According to an example of this manufacture process, at the end of the roasting of plastics MP, and before mould 1 is opened, the F2 that exerts all one's strength increases within the short time (such as 1 second).Such as, power F2 becomes about twice of power F1.This causes the back and forth movement of recoil 7 and drift 6, to improve the shearing to remaining reinforcing fibre, the clout sheet 11 that these remaining reinforcing fibres may produce punching link together with the remainder of parts 2.

The utility model is not restricted to above-described embodiment, and other embodiments are apparent for those skilled in the art.Mould is that injection mold or press molds are especially feasible.

Claims (9)

1. the mould (1) comprising parts punching system for the manufacture of plastic components (2), described mould comprises the first element (3) and the second element (4), these two elements form the die cavity (5) corresponding to described parts (2) to be manufactured when described mould (1) is in the close position, in the mold, described second element (4) comprises at least one and relative to the drift (6) of described second element (4) activity between retrieving position and the extended position in described die cavity (5), can it is characterized in that:

-described first element (3) comprises recoil head (7) that can be movable and coaxial with described drift (6) relative to described first element (3);

-movable described drift (6) can run through described die cavity and enter in described first element (3) at described recoil head (7) place;

-movable described recoil head (7) is connected with servomechanism installation, the counter-force that the power that described servomechanism installation applies to apply on described recoil head than described drift (6) is little, makes the plastics (MP) be included between these two drifts (6,7) to be compressed when described drift (6) shift to its extended position, then by punching.

2. mould as claimed in claim 1, wherein, described servomechanism installation apply to approximate greatly described drift (6) to 50% of the power that described recoil head (7) applies counter-force.

3. mould as claimed in claim 1 or 2, wherein, described recoil head (7) is protruded on extended position in described die cavity.

4. mould as claimed in claim 1 or 2, wherein, the radius of described recoil head (7) is greater than the radius of described drift (6).

5. mould as claimed in claim 4, wherein, the large at least 0.05mm of radius of drift (6) described in the radius ratio of described recoil head (7).

6. mould as claimed in claim 1 or 2, wherein, described drift (6) is resisted against the surface (7a) that surface (6a) on described plastics (MP) and/or described recoil head (7) be resisted against on described plastics (MP) is chromium plating.

7. mould as claimed in claim 1 or 2, wherein, guides described drift (6) in the first wear sleeve (9).

8. mould as claimed in claim 1 or 2, wherein, guides described recoil head (7) in the second wear sleeve (10).

9. mould as claimed in claim 1 or 2, wherein, described servomechanism installation (8) is hydraulic cylinder or pneumatic cylinder.