CN1209383A

CN1209383A - Combined die for injection-moulding and method for making rotary workpiece by using same

Info

Publication number: CN1209383A
Application number: CN98116029A
Authority: CN
Inventors: 黑田隆; 高桥良一
Original assignee: Aiwa Co Ltd
Current assignee: Sony Corp
Priority date: 1997-07-11
Filing date: 1998-07-10
Publication date: 1999-03-03
Anticipated expiration: 2018-07-10
Also published as: ID21270A; KR100283041B1; MY120997A; KR19990013765A; CN1118363C; TW375567B

Abstract

A combined mold is provided with a first mold with a molding face and a pyramid-shaped outer side face, a second mold having a pyramid-shaped recessed inner side face being fitted and brought into contact with an outer side face of the first mold on one side, also having a pyramid-shaped outer face on the opposite side and forming a side section starting from one side face of the rotor and a third mold having a pyramid-shaped recessed inner face being fitted and brought into contact with the outer side face of the second mold and forming a molding face for forming the other side face of the rotor, and in the combination of the first mold and the second mold and also in the combination of the second mold and the third mold, the position and posture relations between respective molds are determined by the fitting contact of respective outer side faces with respective inner side faces.

Description

Injection moulding is used sectional die and is made the method for revolving part with this mould

The present invention relates to a kind of injection moulding sectional die, relate in particular to a kind of molded moulded product, such as the injection moulding sectional die of revolving part with make the method for revolving part with this mould.

Shown in Fig. 5 to 8 and 10, in the traditional moulds of an injection moulding such as the revolving part of rotation belt pulley or pulley, one first mould 102 and a pair of

second mould

103a and 103b and one the 3rd mould 104 are combined.When clamping mold, first mould 102 forms the center hub of a side surface and rotating pulley, and is contained in regularly in the bottom base 101; A pair of

second mould

103a and 103b form a V-shaped groove on the outer surface of rotating pulley, second mould can be guided slidably, so that radially being moved away from each other along the axis hole in the rotating pulley; The 3rd mould 104 forms the opposite side surface and the center hub of rotating pulley, and is contained in regularly in the top base 106.Position between bottom base 101 and the top base 106 and posture relation determined by one fen mould guiding mechanism of injection (mo(u)lding) machine (not shown), this minute the mould guiding mechanism make mould and pedestal slide or roll so that their are located with a fit system of being scheduled to.Along with moving down of top base 106, one the second mould 103a that is separated from each other is directed to a position that is in contact with one another with another second mould 103b by top base 106, and locatees with respect to the 3rd mould 104 in the top base 106 when clamping mold.Determining as mentioned above of position between bottom base 101 and the top base 106 and posture relation, two

second mould

103a and 103b are with respect to the 3rd mould 104 location in the top base 106, and therefore mutual alignment between first mould 102, two

second mould

103a and 103b and the 3rd mould 104 and posture are closed when tying up to mold cramping and be determined.

So the precision of the mutual alignment between first mould 102, two

second mould

103a and 103b and the 3rd mould 104 and posture relation depends on the precision of branch mould guiding mechanism of the injection (mo(u)lding) machine of slip or rolling base and mould.But generally speaking, the sliding motion of the branch mould guiding mechanism in the injection (mo(u)lding) machine or the precision of rolling movement will relate to so-called clearance or play problem inevitably.

When carrying out injection moulding in a kind of like this mould structure, the relative position of the mould after all clampings is skew slightly to some extent always, and that is because sliding motion and rolling movement in the injection (mo(u)lding) machine need due to the play.Therefore, when molded moulded product such as the rotating pulley that needs high dimensional accuracy, because of the above-mentioned decline that departs from the dimensional accuracy that causes has just become problem.

In view of the above problems, caused the present invention.An object of the present invention is to provide the sectional die that a kind of injection moulding uses and make a kind of method of revolving part with this mould, wherein, compare with traditional structure, location between mould and posture relation obtained accurately and more smoothly determining, thereby the moulded product such as revolving part of high dimensional accuracy can molded requirement be arranged.

Another object of the present invention provides sectional die that a kind of injection moulding uses and makes a method of revolving part with this mould, and wherein, even comprise the mould of opening in a minute when this injection molding, centering of all moulds also can accurately be carried out.

Above-mentioned purpose of the present invention is to realize by the sectional die that an injection moulding is used, and this mould comprises: one first mould, this first mould have the molded surface that a tapered outer side surface and forms a side surface of the moulded product that is the revolving part form; One second mould, the one side has the recessed inner surface of a taper, contact to form to cooperate with the outer surface of first mould, also have the outer surface of a taper, second mould that one molding part that forms sidepiece revolving part, that extend from a side surface of revolving part is arranged at this side opposite side outwardly; And one the 3rd mould, the 3rd mould has a tapered recess inner surface that is used for cooperating the outer surface that contacts second mould, be used for forming the molded surface on revolving part opposite side surface in addition, wherein first mould is in the same place with second die assembly, second mould and the 3rd die assembly are together, at this moment, position between mould and posture relation is definite with the cooperation contact between the corresponding inner surface by each outer surface.

Be used for injection molding this sectional die, revolving part is a disk-like shape, and when the position of second mould and posture relation were determined by the tapered recess inner surface of the 3rd mould, first, second and the 3rd mould just can be centered.

Each outside and the inner surface of all moulds all form conical butt, and the end surfaces of the frusto-conical portion of the first and the 3rd mould comprises molded surface respectively, in order to form the opposite side surfaces of revolving part respectively.

In mould, the recessed inner surface of the outer surface of first mould and second mould forms the side surface of taper.

According to another aspect of the present invention, the invention provides the sectional die that a kind of injection moulding is used, this mould comprises: one first mould, this first mould have the molded surface that an outer surface and forms a side surface of the moulded product that is the revolving part form; One second mould, the one side has a recessed inner surface, contact in order to cooperate with the outer surface of first mould, the outer surface that also has a taper at this side opposite side outwardly, second mould have one form revolving part, from the molding part of the vertically extending sidepiece of a side surface of revolving part, second mould is separated into two branch moulds in the plane that comprises the revolving part axis, make two branch moulds of this mould to be moved away from each other; And one the 3rd mould, the 3rd mould has a tapered recess inner surface that is used for cooperating the outer surface that contacts second mould, be used for forming the molded surface on revolving part opposite side surface in addition, wherein, two branch moulds of second mould separated from one another shift to described first mould and combination with one another together, second mould is in the same place with the 3rd die assembly, and at this moment, the position between mould and posture relation is definite with the cooperation contact between the corresponding inner surface by each outer surface.

According to a further aspect of the invention, the invention provides a kind of method of usefulness one sectional die injection moulding revolving part, this method may further comprise the steps: one first mould is provided, and this first mould has the molded surface that a tapered outer side surface and forms a side surface of revolving part; Make up one second mould, one side of second mould has the recessed inner surface of a taper, opposite side outside this recessed inner surface faces also has the outer surface of a taper, also has a molding part, contact by the cooperation between the outer surface of recessed inner surface and first mould, form peripheral part revolving part, that extend from a side surface of revolving part with first mould; Make up one the 3rd mould, the 3rd mould has a tapered recess inner surface, also have one by cooperation contact and the second mould molded surface that form revolving part opposite side surface of recessed inner surface between the outer surface of second mould, position and posture relation between all moulds have been determined thus, subsequently moulding material is injected the die cavity of the molding part formation of mould, to be molded as revolving part.

In the method for injection moulding one revolving part, second mould is divided into two branch moulds in the plane of containing the revolving part axis, second mould and first die assembly are together, this combination is to shift to described first mould that will combine by described two the branch moulds that are separated from each other of second mould, cooperates to contact with the outer surface of described first mould and carries out.

First, second with the 3rd mould be by the 3rd mould recessed inner surface with cooperate the cooperation of the outer surface of second mould that contact to contact with first mould to center.

In the sectional die that injection moulding is used, first mould is in the same place with second die assembly, second mould and the 3rd die assembly together, at this moment, the position between mould and posture relation is definite with the cooperation contact between the corresponding inner surface by each outer surface.Therefore, all die assemblies together after during clamping mold, the setting of the location of mould and mould posture just can be easy and be accurately finished.In addition, all moulds can be combined with the recessed inner surface of the taper that contacts with this outer surface cooperation by the outer surface of taper, therefore, in the combination with one another between mould, the setting of the location of the position toward each other of mould and the posture of all moulds, as long as by each outer surface just contact and can finish easily with the cooperation of corresponding recessed inner surface, therefore, all die assemblies together the time each other less than interference.So, contact with the cooperation of corresponding recessed inner surface by each tapered outer side surface, all moulds just can be combined, therefore, in the time of in resin injects by the formed molding cavity of the molded surface of mould, the pressure of resin is born or is supported by the conical surface of whole combination, and the distortion of mould can be reduced to a floor level.

Revolving part is a disk-like shape, and when the position of second mould and posture relation were determined by the tapered recess inner surface of the 3rd mould, first, second and the 3rd mould just can center.Therefore, by machined, just can accurately form a central shaft or axis hole.

Each outside and the inner surface of all moulds all form conical butt, and the end surfaces of the frusto-conical portion of the first and the 3rd mould comprises molded surface respectively, in order to form the opposite flank of revolving part respectively.Therefore, can obtain the contact between the end surfaces of all moulds, this contact pressure that is obtained when determining the posture of all moulds can reach degree very uniformly.

One side of second mould has the recessed inner surface of a taper, contacts to do to cooperate with the outer surface of first mould, and the opposite side outside this recessed inner surface faces also has the outer surface of a taper.Second mould is split in the plane that comprises the revolving part axis or is divided into two branch moulds, makes two fens moulds separated from one anotherly to move.Second mould has molding part, in order to form revolving part, from the vertically extending sidepiece of a side surface of revolving part.Therefore, be a reeded product even be molded into product, the rotating pulley of a V-shaped groove is for example arranged on the periphery, moulded product also can be deviate from from mould easily, and way is that two fens moulds of second mould are separated from each other.Though second mould is the branch open form, but shift to first mould that will be combined in together by the branch mould that makes second mould, and second mould is contacted with the recessed inner surface cooperation of the 3rd mould, can position and the posture of second mould is set second mould, therefore, when clamping injection molding, centering of each mould can be carried out automatically.

Method with this sectional die injection moulding revolving part may further comprise the steps: one first mould is provided, and this first mould has the molded surface that a tapered outer side surface and forms a side surface of revolving part; Make up one second mould, one side of second mould has the recessed inner surface of a taper, opposite side outside this recessed inner surface faces also has the outer surface of a taper, also has a molding part in addition, contact by the cooperation between the outer surface of recessed inner surface and first mould, with first mould form revolving part, from the vertically extending peripheral part of a side surface of revolving part; Make up one the 3rd mould, the 3rd mould has a tapered recess inner surface, also have one by cooperation contact and the second mould molded surface that form revolving part opposite side surface of recessed inner surface between the outer surface of second mould, position and posture relation between all moulds have been determined thus, subsequently moulding material is injected the formed die cavity of molding part of mould, with molded revolving part.Therefore, the tapered recess inner surface of second mould contacts with the cooperation of the tapered outer side surface of first mould, the tapered recess inner surface of the 3rd mould begins to contact with the tapered outer side surface cooperation of second mould, by in this way together, just can position and the posture of mould is set mould all die assemblies.As a result, be formed in order to the die cavity that is injected into of molded revolving part by all molding parts of all moulds, then, resin (moulding material) is injected this be injected into die cavity with the injection moulding revolving part.At this moment, the outer surface of each taper keeps being fitted to each other contacting with corresponding tapered recess inner surface, more specifically says so and surrounds the outer surface of first mould with second mould, and the 3rd mould surrounds a kind of like this method of second mould.Therefore, all moulds can be combined well, and the pressure that is infused in the resin in the mould can be reduced to minimum level to the influence that mould caused, thereby can obtain high-precision injection-molded product.

In the method for a molded revolving part, second mould is divided into two branch moulds in the plane of containing the revolving part axis, second mould and first die assembly are together, this combination is to shift to first mould that will combine by two branch moulds that are separated from each other of second mould, carries out to cooperate to contact with the outer surface of first mould.Therefore, when from injection molding, taking off injection-molded product, two branch moulds of second mould can be moved away from each other after the 3rd mould separating second mould, when second mould and first die assembly, two branch moulds of second mould can move towards each other, and also have, the recessed inner surface of the 3rd mould also contacts with the outer surface cooperation of second mould, therefore, by together, just can position and the posture of all moulds is set all moulds all die assemblies.

The outer surface of second mould that the recessed inner surface of the 3rd mould contacts with the cooperation with first mould keeps cooperating contact, therefore, even second mould is the branch open form, even moulded product is the product with central shaft or axis hole, a revolving part for example, all moulds also can center well, thereby can obtain high-precision moulded product.

Fig. 1 is the vertical view of the bottom of the sectional die used of injection moulding of the present invention, and it is in the branch mould state before and after the injection moulding operation;

Fig. 2 is the cutaway view of sectional die of the present invention, and it is in the branch mould state of injection moulding operation front and back;

Fig. 3 is the cutaway view of sectional die of the present invention bottom, in the mold closing state when it is in injection moulding;

Fig. 4 is the cutaway view of the sectional die of the present invention of the IV-IV line intercepting along Fig. 3, in the mold closing state when it is in injection moulding;

Fig. 5 is a vertical view, and it shows the box-like mould of a traditional group that is in the branch mould state before and after the injection moulding operation;

Fig. 6 is the cutaway view of the box-like mould of a traditional group, and it is in the branch mould state of injection moulding operation front and back;

Fig. 7 is a vertical view, and it shows the box-like mould of traditional group that is in the mold closing state when injection moulding;

Fig. 8 is the cutaway view of the box-like mould of traditional group, in the mold closing state when it is in injection moulding;

Fig. 9 is the stereogram of sectional die shown in Figure 1; And

Figure 10 is the stereogram of sectional die shown in Figure 5.

Consult Fig. 1 to 4, the preferred embodiment that is used for the sectional die of injection moulding of the present invention will be described below.Among the figure with this injection moulding sectional die molded be the moulded product of a pulley (revolving part) form, a rotating shaft passes this pulley, pulley has and holds belt and be formed on V-shaped groove on its outer surface.This sectional die comprises that but one is used for forming the opposite opened mould of the lateral sliding of V-shaped groove on the outer surface of rotating pulley.

This sectional die is made up of one first mould 2, the

second mould

3a and 3b and one the 3rd mould 4.First mould 2 is arranged on the core of a bottom base 1, and its inboard side surface and that forms pulley stretches out the hub portion of this side surface; The

second mould

3a and 3b can be respectively towards right and left to slip, and at outer surface formation V-shaped groove as the pulley of moulded product; The 3rd mould 4 is arranged in the top base 6, and it can move up and down with top base 6, and its inboard formation is as the opposite side surface of the pulley of a moulded product and the center hub part that allows rotating shaft pass through.This first mould 2 has a tapered outer side surface 21, second mould 3 that is made of two

second fen mould

3a and 3b has the inner surface 31 of a taper, when first mould 2 and the

second mould

3a and 3b combine in injection moulding, the taper inner surface 31 of the tapered outer side surface 21 of first mould 2 and the

second mould

3a and 3b keeps in touch, thereby has determined position and posture relation between first mould 2 and the second mould 3a and the 3b.Second mould of being made up of the

second mould

3a and 3b 3 has the outer surface 32 of a taper, the 3rd mould 4 has a taper inner surface 42, when the

second mould

3a and 3b and the 3rd mould 4 are combined in injection moulding, the taper inner surface 42 of the outer surface 32 of the

second mould

3a and 3b and the 3rd mould 4 keeps in touch, thereby has determined position and posture relation between the

second mould

3a and 3b and the 3rd mould 4.The outer surface 32 of inner surface 31, the second mould 3a and the 3b of the outer surface 21 of first mould 2, the second mould 3a that contacts with this

outer surface

21 and 3b and the inner surface 42 of the 3rd mould 4 that contacts with outer surface 32 can be frustoconical (truncated cone shapes).When two

second mould

3a and 3b combine, form the outer surface of a frustoconical, similarly, the inner surface of the 3rd mould 4 forms a frustoconical.

One or bar 29 are arranged in first mould 2 regularly, and extend along the frustum oblique crank Z of this first mould 2.Because axle this part of 29 is stretched out first mould 2, just formed a through hole at the core of moulded product, rotating shaft is placed this through hole, just formed pulley.The 3rd mould 4 is passed in one hole 49, and extends along frustum of a cone (truncated cone shape) axis of the 3rd mould 4, and axle 29 can insert in this hole 49.When mould was combined in injection moulding, the axis of the axis of first mould 2 and the 3rd mould 4 was in alignment with each other, in axle 29 patchholes 49.Preferably, be formed on

first mould

2,29 frusto-conical outer surface 21 that remain on the interior hole 26 and first mould 2 regularly (is promptly had a common axle) coaxially to each other, like this, needn't from the Workpiece clamping head of a vertical lathe or grinding machine, take off workpiece, just can form hole 26 and outer surface 21.Preferably, the hole 49 in the 3rd mould 4 and the inner surface 42 of the 3rd mould 4 (promptly have a common axle) also coaxially to each other, like this, needn't take off workpiece from the Workpiece clamping head of a vertical lathe or grinding machine, just can form hole 49 and inner surface 42.

First mould 2 has an end surfaces 23, promptly trapezoidal upper surface, the part of diameter minimum in the taper shape.This end surfaces 23 extends perpendicular to conical axis, as the molded surface of a formation moulded product one side surface.Second mould of being made up of

mould

3a and 3b 3 has an end surfaces 33 that forms an inner surface, and this part is the part of diameter minimum in the conical butt recess, and this end surfaces 33 extends perpendicular to conical axis.Combine in process of injection molding when first mould 2 and second mould 3, when outer surface 21 and inner surface 31 contacted with each other, the top end surface 23 of first mould 2 and the end surfaces 33 of second mould 3 also contacted with each other.As shown in Figure 9, second mould 3 has an end surfaces 34 as the top surface of this mould, and this part is the part of diameter minimum in the frustum of a cone, and this end surfaces 34 extends perpendicular to conical axis.The 3rd mould 4 has the end surfaces 44 of a formation one inner surface, and this part is the part of diameter minimum in the conical butt recess, and this end surfaces 44 extends perpendicular to conical axis.Combine in process of injection molding when second mould 3 and the 3rd mould 4, when the inner surface 42 of second mould, 3 outer surfaces 32 and the 3rd mould 4 contacted with each other, the top end surface 34 of second mould 3 and the end surfaces 44 of the 3rd mould 4 also contacted with each other.Preferably, contact between the outer surface 32 of contacting between the inner surface 31 of the outer surface 21 of first mould 2 and second mould 3, second mould 3 and the inner surface 42 of the 3rd mould 4, between the end surfaces 33 of the end surfaces 23 of first mould 2 and second mould 3 contact and the end surfaces 44 of the end surfaces 34 of second mould 3 and the 3rd mould 4 between contact, do not contact each other at other any position of first, second and the

3rd mould

2,3 and 4.

As illustrated in fig. 1 and 2, second mould 3 is divided into two and splits half module or divide

mould

3a and 3b in the separate planes that comprises the frustum of a cone axis.Mould 3a was supported on the surface 21, the Frusto-conical outside (periphery) and top end surface 23 of first mould 2 with another minute mould 3b in one minute, and keep in touch with them, though two

branch mould

3a and 3b are owing to be restricted posture with engaging of first mould 2, but still can on first mould 1, be moved away from each other along opposite direction (frustum of a cone radially) respectively, thereby can take out molded good product.Radially separated from one another mobile of two

fens mould

3a and 3b is to be finished by the mould-spliting machine structure (not shown) of an injection (mo(u)lding) machine.

The 3rd mould 4 moves apart first and

second moulds

2 and 3 by the mould-spliting machine structure along its axis direction.As illustrated in fig. 1 and 2, two the branch mould 3a and the 3b of second mould 3 radially remain apart, in this case, when the 3rd mould 4 is axially shifted to second mould 3 along it, so that when carrying out injection moulding, be fixedly mounted on axle 29 holes 49 of at first inserting in the 3rd mould 4 on first mould 2, the axis of first mould 2 and the 3rd mould 4 before finishing, sectional die just is in alignment with each other, the frustum of a cone inner surface 42 of the 3rd mould 4 contacts with the frustum of a cone outer surface of splitting 32 of second mould 3, and two

fens mould

3a and 3b are radially moved towards each other.Be preferably between axle 29 and the hole 49 and form a very little gap, this gap will not allow moulded resin (be used for moulded product) to clamp-on wherein, in case the resin of clamp-oning formation burr.When sectional die is finished when carrying out injection moulding, what position between first mould 2 and the 3rd mould 4 and posture concerned determines not only to depend in the hole that is arranged on the 3rd mould 4 49 of axle 29 (being fixedly mounted in first mould 2), but as shown in Figure 3 and Figure 4, when two fens mould 3a of

second mould

3 and 3b contact with each other, the internal end surface 44 of the 3rd mould 4 contacts with the top end surface 34 of second mould 3, the power that the 3rd mould 4 is pressed to second mould 3 has been born or supported to contacting between the inner surface 42 of being not only the 3rd mould 4 and the outer surface 32 of second mould 3, but this power will be born or support to contacting also between the end surfaces 44 of the end surfaces 34 of second mould 3 and the 3rd mould 4.

When the 3rd mould 4 is axially shifted to second mould 3 along it, when the frustoconical inner surface of the 3rd mould 4 is contained on the frustum of a cone outer surface of second mould 3, the two fens mould 3a and the 3b of second mould 3 contact with each other, the inner surface 31 of second mould 3 also contacts with the outer surface 21 of first mould 2, and, the power that the 3rd mould 4 is pressed to second mould 3 has been born or supported to contacting between the end surfaces 23 of being not only first mould 2 and the end surfaces 33 of second mould 3, and this power is also born or supported to contacting between the inner surface 31 of the outer surface 21 of first mould 2 and second mould 3.

Therefore, when moulded product is injected into type, the 3rd mould 4 is shifted to second mould 3 and first mould 2 along its axis, and press to second mould 3, the thus obtained pressure of mat, first, the second and the

3rd mould

2,3 and 4 contact with pressure between the inner surface 31 by outer surface 21, outer surface 32 contacts with pressure between the inner surface 42, end surfaces 23 contacts with pressure between the end surfaces 33 and end surfaces 34 contacts with pressure between the end surfaces 44 and in conjunction with or combine, meanwhile these moulds are centered, make as the rotating pulley of moulded product placed in the middle, thereby finish the combination of mould by this way.

First mould 2 remains in the bottom base 1 movably, and a gap is arranged between them.The 3rd mould 4 remains in the top base 6 movably, and a gap is also arranged between them.First mould 2 and the 3rd mould 4 move towards each other through

last bottom base

1 and 6 by the mould-spliting machine structure of injection (mo(u)lding) machine.Gap between first mould 2 and the bottom base 1 between gap and the 3rd mould 4 and the top base 6 prevents that posture and the position relation between the first and the

3rd mould

2 and 4 is subjected to the interference of these pedestals 1 and 6.Two fens mould 3a of

second mould

3 and 3b be by the slidably 5a of mold closing spare 5 and 5b part and move respectively on bottom base 1, and be closer to each other till 42 and 32 degree that are engaged with each other of two surfaces up to the outer surface 32 of the inner surface 42 of the 3rd mould 4 and second mould 3.Under the situation of mold cramping, between the mold closing spare 5 and second mould 3, have a gap, the position of second mould 3 and posture can not be subjected to the constraint of mold closing spare 5.Along with moving down of top base 6, surface 61 slips are touched along a wedging inscribing of top base 6 in the wedge shape outer contacting surface 51 of two parts 5a of mold closing spare 5 and 5b, make two

parts

5a and 5b move towards each other.

Even form a beveled surface, a recess, a recess or the like between each conical contact inner surface of each mould or outer surface and the end surfaces that extends perpendicular to the taper axis, this structure that is formed by contact inner surface or outer surface and end surfaces still all drops within the scope of " frustoconical " described in this specification.

The frustoconical inboard and the outer surface of mould can be replaced by truncated pyramid inner surface and outer surface respectively, and can use the inboard and outer surface (such as circular cone and pyramid) of any taper.

In addition, the outer surface 21 of first mould 2 and the inner surface 31 of second mould 3 are described to conical butt or pyramid, but they also can be a columniform outer surface or inner surfaces, as long as it is just passable that they can navigate to first mould 2 to second mould 3 that separates, the shape on the surface among the present invention is unrestricted.

Shown in Fig. 1 to 4, rotating shaft is contained in the centre bore as the rotating pulley of moulded product or revolving part, and for this structure is provided, axle 29 is arranged in first mould 2, and hole 49 is formed in the 3rd mould 4.But the cylindrical axial region that plays a rotating shaft effect also can be arranged on the core of pulley.In this case, the cylindrical recess branch is respectively formed in first mould and the

3rd mould

2 and 4, and extends along its taper axis respectively.In this case, the conical butt axis of the conical butt axis of first mould 2 and the 3rd mould 4 is in alignment with each other when first, second and the

3rd mould

2,3 and 4 are clamped together.

In the present invention, the decline of the positional precision the during die assembly that prevented to run into so far in traditional structure also need not improve the precision of these die assemblies relative installation of a plurality of moulds together the time easily in order to make cooling.Because the contact inner surface and the outer surface of mould become the shape (circular cone or pyramid) that diminishes gradually, the branch mould of opposite opened mould can be resisted and firmly can make their lateral slidings separated from one another and keeping original position firmly under the situation of mold cramping, molded product is that revolving part can center, and the dimensional accuracy of moulded product also can be improved.

Claims

1. the sectional die used of an injection moulding, it comprises:

One first mould, this first mould have the molded surface that tapered outer side surface and forms a side surface of the moulded product that is the revolving part form;

One second mould, the one side has the recessed inner surface of a taper, so that doing cooperation with the described outer surface of described first mould contacts, opposite side outside the facing of this side also has the outer surface of a taper, described second mould have one form described revolving part, from the molding part of the vertically extending sidepiece of a side surface of revolving part; And

One the 3rd mould, the 3rd mould have a tapered recess inner surface that is used for cooperating the described outer surface that contacts described second mould, are used for forming the molded surface on described revolving part opposite side surface in addition,

Wherein said first mould is in the same place with described second die assembly, described second mould and described the 3rd die assembly are together, at this moment, position between mould and posture relation is definite with the cooperation contact between the corresponding inner surface by each described outer surface.

2. the sectional die that injection moulding as claimed in claim 1 is used, it is characterized in that, described revolving part is a disk-like shape, when the position of described second mould and posture relation were determined by the described tapered recess inner surface of described the 3rd mould, described first, second and the 3rd mould were centered.

3. the sectional die that injection moulding as claimed in claim 1 is used, it is characterized in that, the described outside of each of described mould and inner surface form conical butt, described first and the end surfaces of the frusto-conical portion of the 3rd mould comprise molded surface, in order to form the opposite side surfaces of described revolving part respectively.

4. sectional die that injection moulding is used, it comprises:

One first mould, this first mould have the molded surface that an outer surface and forms a side surface of the moulded product that is the revolving part form;

One second mould, the one side has a recessed inner surface, so that doing cooperation with the described outer surface of described first mould contacts, the outer surface that also has a taper at this side opposite side outwardly, described second mould have one form described revolving part, from the molding part of a vertically extending sidepiece of side surface of revolving part, described second mould is divided into two branch moulds in the plane that comprises described revolving part axis, make described two branch moulds separated from one anotherly to move; And

One the 3rd mould, the 3rd mould have a tapered recess inner surface that is used for cooperating the described outer surface that contacts described second mould, are used for forming the molded surface on described revolving part opposite side surface in addition;

Wherein, described two minutes moulds of described second mould separated from one another are shifted to described first mould and are combined, described second mould that is under this assembled state is in the same place with described the 3rd die assembly, at this moment, position between described mould and posture relation is definite with the cooperation contact between the corresponding inner surface by each described outer surface.

5. the sectional die that injection moulding as claimed in claim 4 is used is characterized in that, the described outer surface of first mould and the described concave side surface of second mould comprise the side surface of a taper.

6. method with a sectional die injection moulding revolving part, it may further comprise the steps:

One first mould is provided, and this first mould has the molded surface that tapered outer side surface and forms a side surface of described revolving part;

Make up one second mould, one side of second mould has the recessed inner surface of a taper, opposite side outside the facing of this recessed inner surface then has the outer surface of a taper, also has a molding part, contact by the cooperation between the described outer surface of described recessed inner surface and described first mould, with described first mould form described revolving part, from the vertically extending peripheral part of a side surface of revolving part;

Make up one the 3rd mould, the 3rd mould has a tapered recess inner surface, also have one by cooperation contact and the described second mould molded surface that form described revolving part opposite side surface of described recessed inner surface between the described outer surface of described second mould, determined position and posture relation between the described mould thus; And

Moulding material is injected the die cavity of the molding part formation of described mould, in order to molded described revolving part.

7. method as claimed in claim 6, it is characterized in that, described second mould is divided into two branch moulds in the plane of containing described revolving part axis, described second mould and described first die assembly together, this combination is to shift to described first mould that will combine by the described two minutes moulds that are separated from each other of described second mould to do to cooperate to contact to carry out with the described outer surface of described first mould.

8. method as claimed in claim 6, it is characterized in that, described first, second with the 3rd mould be by described the 3rd mould described recessed inner surface with cooperate the described outer surface of described second mould that contact to do to cooperate contact and quilt to be centered with described first mould.