CN103997926A

CN103997926A - Fastener element and method for producing same, die, and injection molding device

Info

Publication number: CN103997926A
Application number: CN201180075512.9A
Authority: CN
Inventors: 木原浩; 长谷川雅道
Original assignee: YKK Corp
Current assignee: YKK Corp
Priority date: 2011-12-15
Filing date: 2011-12-15
Publication date: 2014-08-20
Anticipated expiration: 2031-12-15
Also published as: WO2013088561A1; CN103997926B; TWI465208B; TW201340905A

Abstract

A method for producing a fastener element includes steps for die-matching the following: a first die (50) having a die-matching surface provided with a plurality of cavities (51); a second die (70) having a die-matching surface provided with a plurality of cavities (71); and a core part (60) protruding into the interior of fastener-element molding cavities (85) which are produced as a result of the cavities (51, 71) of the first and the second dies (50, 70) opposing one another. The core part (60) is provided with a plurality of gates (61) for connecting to a common runner (82) and supplying a filling material into the plurality of fastener-element molding cavities (85). The exit ports (61b) of the gates (61) are positioned on the projecting surfaces (67c) of the core part (60) which projects into the fastener-element molding cavities (85).

Description

The manufacture method of sprocket and sprocket and mould and Coinjection molding apparatus

Technical field

The present invention relates to manufacture method and mould and the Coinjection molding apparatus of a kind of sprocket and sprocket.

Background technology

Since previously, by various method for makings, manufactured slide fastener.As the chain band of the main composition part of slide fastener, be to manufacture by utilizing Coinjection molding apparatus to form chain tooth row at the side of chain cloth.

Fig. 2 of patent documentation 1 represents that But moving die 12 declines with respect to fixed die 11, and core 13 is pushed up state upward.As shown in the drawing, in fixed die 11, hand-hole 17, rail groove 18 are being set, accommodating the forming section 22a of the shaping use of the groove 19a of core 13, the groove 20a that accommodates chain cloth, cast gate groove 21 and engaging tooth 3.When But moving die 12, core 13 and fixed die 11 are stacked, resin is supplied with to forming section 22a via hand-hole 17, rail groove 18 and cast gate groove 21.In addition, Fig. 3 of the document represents to extract from core 13 process of the tectosome of moulding.After the step of this figure, in gate cutting step, the part that do not need that remains in hand-hole 17, rail groove 18 and cast gate groove 21 is removed from chain band body.

Patent documentation 2 is as shown in Fig. 3 of the document and Fig. 4, represents that slit forming portion 17 is to the outstanding formation in the inner space of tooth mould 9.This formation is to be identical formation with patent documentation 1.

Background technology document

Patent documentation

Patent documentation 1: Japanese patent laid-open 3-182202 communique

Patent documentation 2: United States Patent (USP) 5,529, No. 482

Summary of the invention

[inventing problem to be solved]

While manufacturing the situation of chain band as disclosed in patent documentation 1, require the part that do not need that is filled in runner and cast gate and solidify to excise from chain band body.During this situation, as a kind of method, consider to utilize rotating knife etc. to cut off arbitrarily equipment, from sprocket portion (sprocket portion is for becoming the part of sprocket cutting off), gate part (gate part is that the packing material that remains in cast gate solidifies the part forming) is individually cut off.Yet, in actual manufacture process, while cutting off gate part from sprocket portion, may have and cannot cut off from the root of gate part, and for example, in the situation of the remained on surface cast gate trace (cast gate projection) of sprocket.For example, when the situation of patent documentation 1, as recorded in Fig. 3 of the document, be that chain cloth is pulled to arrow P direction, so the configuration of sprocket generation deviation, result has the deteriorated worry of precision of the excision of gate part.Although described cast gate trace is small, cannot ignore with regard to the aspect that is in a ratio of non-flat forms with regard to the surface with sprocket.For example, have because contacting and wait the worry that causes sense of discomfort to wearing people's (such as children, women etc.) of the clothes that slide fastener is installed.

From described explanation, the harmful effect that expectation restraint measure causes at the cast gate trace of sprocket.In addition, described problem is illustrated as illustration, does not allow the invention of limited interpretation this case on this basis.

[technological means of dealing with problems]

The manufacture method of the sprocket of one embodiment of the present invention comprises the following steps: mould engagement step, make arranging on mould composition surface the first mould of a plurality of die cavitys, the second mould of a plurality of die cavitys is being set on mould composition surface, and to described first and second mould described die cavity separately relatively to and the sprocket that produces forms outstanding core in die cavity and carries out mould joint, and in described core, arranging and be connected in shared runner and form to a plurality of described sprockets a plurality of cast gates that die cavity is supplied with packing material, the flow export that is arranged on the described cast gate of described core is arranged on the face that exposes of the described core that exposes in described sprocket forms die cavity, and make described shared runner be connected in via a plurality of described cast gates under the state of a plurality of described sprockets formation die cavitys by described mould engagement step, via described runner and described cast gate, to described sprocket, form die cavity and supply with packing material.

According to this manufacture method, the sprocket portion forming utilizing sprocket to form die cavity, is forming slot part, and on the face of this slot part, is connecting the gate part that utilizes cast gate and produce corresponding to the protuberance of core.Thus, from the disconnected gate part of chain toothed portion, even if residual cast gate trace also can suppress cast gate trace itself and external contact.And, even if so subsequent step in cast gate trace is removed situation time, also can reduce cast gate trace still residual and become the possibility of problem.In addition, be arranged on being specifically configured to arbitrarily of cast gate in the core of a part that forms mould, illustration is recess, through hole etc.

Preferably also comprise the steps: at described sprocket, to form the boundary disjunction of die cavity and described cast gate by least forming the tectosome curing and that produce of packing material described in die cavity and described cast gate at described sprocket.

Preferably include following steps: make described first and described the second mould at least one mould and described core be separated from each other, disjunction forms tectosome continuous between die cavity and described cast gate at described sprocket.

Preferably include following steps: the part of the moulding in runner and cast gate of described tectosome is left from described core, and disjunction forms tectosome continuous between die cavity and described cast gate at described sprocket.

Be preferably arranging described cast gate described flow export described in expose face with respect to described first or the bottom surface of the described die cavity of the second mould and relatively to.

Be preferably and via the described cast gate of described core, to described sprocket, form die cavity to supply with the described step of described packing material be to carry out under following state: first and second mould described mould composition surface separately described in the chain cloth utilization of described sprocket will be installed and clip, and the core rope of described chain cloth is configured in described sprocket and forms in die cavity.

A sprocket, the manufacture method of the sprocket by described arbitrary record is manufactured, and this sprocket comprises: main part; Neck, extend, and width is narrower than described main part from described main part; Head, extend, and width is wider than described neck from described neck; And one group of shoulder, from described main part, extend, and to clip the form setting of described neck; At the front end face of described head, the slot part extending along the configuration direction of shoulder described in a group is being set, at this slot part, cast gate trace is being set.

Be preferably the cast gate trace that is arranged on slot part more amesiality and arrange than the short transverse center of slot part in the short transverse of sprocket.

Be preferably the central authorities that described cast gate trace is positioned at the bearing of trend of described slot part.

The sprocket of one embodiment of the present invention comprises: main part; Neck, extend, and width is narrower than described main part from described main part; Head, extend, and width is wider than described neck from described neck; And one group of shoulder, from described main part, extend, and to clip the form setting of described neck; The slot part extending along the configuration direction of shoulder described in a group is being set at described head, at described slot part, cast gate trace is being set.

Be preferably described cast gate trace and be formed on partly described slot part.

The inner face that is preferably described cast gate trace and described slot part is in a ratio of non-flat forms.

A part that is preferably the edge of described cast gate trace front end face is from the head present in inside slot part continuously.

The edge that is preferably described cast gate trace front end face is from the head left and exists.

The mould of one embodiment of the present invention comprises: the first mould, is arranging a plurality of die cavitys on mould composition surface; The second mould, is arranging a plurality of die cavitys on mould composition surface; And core, to described first and second mould described die cavity separately relatively to and the sprocket that produces forms in die cavity outstanding; In described core, arranging and be connected in shared runner and form to a plurality of described sprockets a plurality of cast gates that die cavity is supplied with packing material; And the flow export that is arranged on the described cast gate of described core is arranged on the face that exposes of the described core that exposes in described sprocket forms die cavity.

Described in being preferably, expose the bottom surface of face and the described die cavity of described the first mould or described the second mould relative to.

Being preferably described cast gate is the surperficial recess that is formed on the flow passage side of described core.

Being preferably described cast gate is the through hole that is formed on described core.

The Coinjection molding apparatus of one embodiment of the present invention comprises the mould of described record.

[effect of invention]

According to the present invention, can suppress to be formed on the harmful effect that the cast gate trace of sprocket causes.

Accompanying drawing explanation

Fig. 1 is the diagrammatic elevational view of the slide fastener of the first embodiment of the present invention.

Fig. 2 is summary side elevation and the top view of the sprocket of the first embodiment of the present invention.

Fig. 3 is summary side elevation and the front view of the sprocket of the first embodiment of the present invention.

Fig. 4 is the local enlarged diagram of summary of the slide fastener of the first embodiment of the present invention.

Fig. 5 is the summary end-view along 2 chain lines of the slide fastener of Fig. 4.

Fig. 6 is the skeleton diagram of the Coinjection molding apparatus of the first embodiment of the present invention.

Fig. 7 observes the generalized schematic of bed die and the core of the first embodiment of the present invention from mold.

Fig. 8 means the generalized schematic that the section of mould of the closure state of the first embodiment of the present invention forms, and represents along the summary section of the X8-X8 of Fig. 7.

Fig. 9 means the generalized schematic that the section of mould of the closure state of the first embodiment of the present invention forms, and represents along the summary section of the X9-X9 of Fig. 7.

Figure 10 means the block diagram of the state after the mould of the first embodiment of the present invention engages.

Figure 11 means that the packing material of the first embodiment of the present invention is filled to the block diagram of the state in mould.

Figure 12 means the block diagram of state of the mould die sinking of the first embodiment of the present invention.

Figure 13 means that the core from mould of the first embodiment of the present invention releases the block diagram of the state of unwanted cured portion.

Figure 14 is the generalized schematic of sprocket of the state that is connecting gate part of oblique observation the first embodiment of the present invention.

Figure 15 means the schematic diagram of variation example of the mould of the first embodiment of the present invention.

Figure 16 is summary side elevation and the top view of the sprocket of the second embodiment of the present invention.

Figure 17 observes the generalized schematic of bed die and the core of the second embodiment of the present invention from mold.

Figure 18 means the generalized schematic that the section of mould of the closure state of the second embodiment of the present invention forms, and represents along the summary section of the X18-X18 of Figure 17.

Figure 19 means the generalized schematic that the section of mould of the closure state of the second embodiment of the present invention forms, and represents along the summary section of the X19-X19 of Figure 17.

Figure 20 means the block diagram of the state that the mould of the second embodiment of the present invention engages.

Figure 21 means that the packing material of the second embodiment of the present invention is filled to the block diagram of the state in mould.

Figure 22 means the block diagram of state of the unit that moves moulds of the second embodiment of the present invention.

Figure 23 means the block diagram of die opening state of the mould of the second embodiment of the present invention.

Figure 24 means the generalized schematic that the section of sprocket of the state that is connecting gate part of the second embodiment of the present invention forms.

Figure 25 is the generalized schematic of observing from the direction of arrow along the dotted line of Figure 24.

Figure 26 means that the packing material of the 3rd embodiment of the present invention is filled to the block diagram of the state in mould.

Figure 27 means the block diagram of state of the unit that moves moulds of the 3rd embodiment of the present invention, and only represent Figure 26 left side half.

Figure 28 means the summary upper surface of sprocket and the schematic diagram of section formation of the 4th embodiment of the present invention.

Figure 29 means the block diagram of the state that the mould of the 4th embodiment of the present invention engages.

Figure 30 means that the packing material of the 4th embodiment of the present invention is filled to the block diagram of the state in mould.

Figure 31 means the block diagram of state of the unit that moves moulds of the 4th embodiment of the present invention.

Figure 32 means the block diagram of the state that the mould of the 5th embodiment of the present invention engages.

Figure 33 means that the packing material of the 5th embodiment of the present invention is filled to the block diagram of the state in mould.

The specific embodiment

Below, simultaneously with reference to accompanying drawing one, facing embodiments of the present invention describes.Each embodiment is not independent separately, need not go into the details, as long as just can be appropriately combined for those skilled in the art, also can grasp the cooperative effect of this combination.Repeat specification between embodiment is omitted in principle.

With reference to accompanying drawing, be to illustrate that invention is main purpose, thereby suitably simplify.The term (up and down etc.) that represents direction be take top view accompanying drawing in principle as prerequisite.Axle AX10 shown in Fig. 1 be with moving direction, the length direction of chain cloth of saddle, the orientation of sprocket is consistent, but be not limited thereto.When top view Fig. 1, have the direction that approaches axis AX10 is called to inner side, the direction away from axle AX10 is called to the situation in outside.

In the figure of this case, there is each axle of setting situation in the xyz of orthogonality relation coordinate mutually.X axle is for example corresponding to the degree of depth (depth direction) of sprocket, is also the left and right directions (direction of the direction quadrature sliding with chain cloth level and with saddle) of slide fastener.Y axle for example corresponding to sprocket vertical wide/highly (vertical wide/short transverse), be also the both forward and reverse directions (perpendicular to the direction of the face with chain cloth level) of slide fastener.Z axle is for example corresponding to the horizontal stroke of sprocket wide (horizontal cross direction), is also the fore-and-aft direction (direction of sliding with chain cloth level and for saddle) of slide fastener.In addition, z axle is consistent with the axle AX10 shown in Fig. 1 or the arbitrarily axis parallel with respect to axle AX10.In addition, in the following description, the situation that also has the xyz coordinate of the sprocket based on described to describe in the explanation of mould.Yet xyz coordinate described here is defined as illustration, can suitably change according to the announcement of detailed description and figure.

< the first embodiment >

Referring to figs. 1 through Figure 15, the first embodiment is described.Fig. 1 is the diagrammatic elevational view of slide fastener.Fig. 2 is summary side elevation and the top view of sprocket.Fig. 3 is summary side elevation and the front view of sprocket.Fig. 4 is the local enlarged diagram of the summary of slide fastener.Fig. 5 is the summary end-view along 2 chain lines of the slide fastener of Fig. 4.Fig. 6 is the skeleton diagram of Coinjection molding apparatus.Fig. 7 observes the generalized schematic of bed die and core from mold.Fig. 8 means the generalized schematic that the section of the mould of closure state forms, and is the summary section along the X8-X8 of Fig. 7.Fig. 9 means the generalized schematic that the section of the mould of closure state forms, and is the summary section along the X9-X9 of Fig. 7.Figure 10 means the block diagram of the state after mould engages.Figure 11 means that packing material is filled to the block diagram of the state in mould.Figure 12 means the block diagram of the state of mould die sinking.Figure 13 means the block diagram of releasing the state of unwanted cured portion from the core of mould.Figure 14 is the generalized schematic of the sprocket of the oblique observation state that connecting gate part.Figure 15 means the schematic diagram of the variation example of mould.

As shown in Figure 1, slide fastener (slide fastener) (below sometimes referred to as slide fastener (fastener)) 110 comprises one group of chain band 101 (left side chain band 101a, right side chain band 101b) and saddle 10.By moving up and down of saddle 10, carry out the switching of slide fastener 110.By on draw saddle 10 that it is slided upward, each sprocket 30 of one group of chain band 101a, 101b becomes the state of engagement.By drop-down saddle 10, it is slided downwards, the engagement of each sprocket 30 of one group of chain band 101a, 101b is disengaged.

As shown in Figure 1, chain band 101a comprises the rectangular chain cloth 20a extending along axle AX10 and has the chain tooth row of a plurality of sprockets 30 that the inner side edge (limit close to each other under the state being arranged in parallel at the chain cloth 20a of left and right) along chain cloth 20a arranges with fixed intervals.In addition,, about the formation of the chain band 101b on right side, summary is by the formation upset of the chain band 101a in left side and is offset along axle AX10.In addition, the upper stopper section 30p, the 30q that comprise each upper end of the chain tooth row that is separately positioned on left and right; And the opening and closing part of the lower end of the chain tooth row about being separately positioned on.And, opening and closing part comprise the chain tooth row that is formed on right side bottom cylinder pin and open tail pipe 30n and be formed on left side chain tooth row bottom and can insert described in open the latch 30m in tail pipe.In addition, opening and closing part also can be not separated lower stopper section, left and right.

When the state shown in Fig. 1, between sprocket 30a and sprocket 30c, by meshing, keeping sprocket 30b.This concrete form, by become concrete by following explanation, be need not go into the details, and is known for a person skilled in the art.In addition, as shown in Figure 1, saddle 10 comprises saddle body 11, pulling-on piece installation portion 12, pulling-on piece 13 etc.The formation of saddle 10 is known for a person skilled in the art, so omit, repeats.Chain cloth is that the fibrage manufactures such as polyester are formed, inner side edge at chain cloth inweaves or is enrolling core rope (core) 22, utilize core rope 22 and make as the chain cloth 20 of flat member by flat part 21 and core rope (core) 22 formations that form the inner side edge of chain cloth 20, and the inner side edge of chain cloth 20 is compared with flat portion plate 21 to be and expanded shape.This formation and method for making are any.

The side view (for simplicity, section is observed chain cloth 20) that the top of Fig. 2 divides expression to anchor at a sprocket 30 of chain cloth 20.The bottom of Fig. 2 divide represent from arrow P 3 directions observe this figure part the xz plane that comprises 2 chain lines generalized schematic (here, the head that is defined in sprocket is added with hachure, and from top, can be observed the cast gate trace 36 of the side 35b that is present in groove 35).The left half of Fig. 3 represents to be equal to the side view of sprocket 30 of the upper part of Fig. 2.The right half of Fig. 3 represents to observe from the arrow shown in the left half of this figure the diagrammatic elevational view of sprocket 30.In addition, in Fig. 2 and Fig. 3, have the direction that represents the arrow indication of x axle is recited as to the place ahead/front side, its rightabout is recited as to the situation of rear/rear side.

As shown in Figures 2 and 3, sprocket 30 makes core rope 22 be present in inside, and is that injection moulding is at the positive and negative of chain cloth 20.

As shown in Figures 2 and 3, sprocket 30 comprises: main part 32, is arranged on the tow sides of the inner side edge of chain cloth 20; Head 31, the chain cloth 20 from main part 32 to the other side's side extends setting and meshes with the sprocket 30 of subtend; Neck 33, be formed between main part 32 and head 31, and width is narrower than head 31; One group of shoulder 34 (34a, 34b), configures to clip the mode of neck 33; And slot part 35, be formed on the leading section of head 31, and supply the shoulder 34 of the sprocket 30 of the other side's side to embed.More specifically, neck 33 is forwards to extend from the central area of the horizontal stroke of main part 32 wide (the axial width of z), and head 31 is forwards to extend from the wide whole region of horizontal stroke of neck 33, and it is wide to be greater than the horizontal stroke of neck 33.Shoulder 34a is forwards (from the headward direction of main part) extension of central area of the short transverse width (the axial width of y) from main part 32.In addition, as shown in the lower part of Fig. 2, between head 31 and main part 32, arranging and caving in, thus, forming the described narrower neck 33 of width, and, by entering sprocket meshed for the head of the sprocket 30 of the other side's side when slide fastener closed.In addition, at this recess, shoulder 34a, 34b are being set.

As shown in Figures 2 and 3, at front end face (end face that is opposition side with main part 32 (front end face, the medial surface)) 31c of head 31, arranging that horizontal cross direction (z direction of principal axis) along sprocket 30 extends and two ends are not closed/open groove (also sometimes groove being called to slot part) 35 on depth direction.By groove 35, and make the fore-end of head 31 become concavity, and protuberance 31a, the 31b of the configured in parallel that clips groove 35 are being set.The degree of depth of groove 35 spreads all over the whole region of its bearing of trend for even.As shown in the upper part of Fig. 2, groove 35 is that front is from the head recessed along depth direction, and the face of this groove comprises: with chain cloth level and one group of side 35a, 35b of subtend mutually; And by these sides bottom surface 35c connected with each other and vertical with chain cloth.Side 35a, 35b are the tabular surface with respect to x axle almost parallel, and bottom surface 35c is the tabular surface with respect to x axle substantially vertical (being roughly parallel to y axle).The vertical wide H35 of groove 35 is wider than the vertical wide H34 of shoulder 34.The line (2 chain lines) at the short transverse center of regulation sprocket 30 is positions that the upper end position in the vertical wide H30 from sprocket 30 reduces a half width H15 who is equivalent to vertical wide H30 downwards.This line is also consistent with shoulder 34Zong Kuan center, and consistent with groove 35Zong Kuan center.In addition, the face of groove 35 also can be made as side and bottom surface in the figure shown in Fig. 2, and each face is circular-arc connected face.

In the present embodiment, at the side of groove 35 35b, forming cast gate trace 36.Thus, for example can obtain the known interests of the explanation by following.Cast gate trace 36 is non-flat forms than side 35b, such as being projection, depression, matsurface etc.Here, illustratively cast gate trace 36 is illustrated as to male member.The concrete form of cast gate trace 36 can change according to manufacturing step, and the according to circumstances planarization by additional step.

As shown in Figure 2, cast gate trace 36 in the edge 36m between 35b and front end face 31c from the side (also referred to as edge.Lower part with reference to Fig. 2) on the position of leaving, and be configured in than on the position of the more close bottom surface 35c of this edge 36m.That is to say, cast gate trace 36 is more amesiality and arrange than the short transverse center of slot part 35 in the short transverse of sprocket.During this situation, even if during the situation that cast gate trace 36 is overshooting shape, also can suppress it from forwards flying out in groove 35 to the front end face 31c that exceeds head 31 as far as possible.In addition, the position of the axial cast gate trace 36 of x in the 35b of side is arbitrarily, should not be defined in the announcement of Fig. 2.For example, also can cast gate trace 36 be set to cross over the mode of 35bYu bottom surface, side 35c.In addition, also cast gate trace 36 can be arranged on to the side 35a of the upside in the upper part of Fig. 2 but not the side 35b of downside in this figure.Also can cast gate trace 36 be set to cross over the mode of 35aYu bottom surface, side 35c.Wherein, these cast gate traces 36 are preferably formed on roughly the same position in each sprocket.

As shown in the lower part of Fig. 2, cast gate trace 36 can be arranged on the wide central authorities of horizontal stroke of side 35b.The shoulder that thus, can as far as possible suppress other sprockets that the groove 35 of sprocket 30 as shown in Figure 2 accommodates contact with the cast gate trace 36 of the sprocket 30 shown in Fig. 2 (simultaneously with reference to Fig. 4).

As shown in the lower part of Fig. 2, meet the relation of the horizontal wide W36a of maximum of the horizontal wide W33a > cast gate trace 36 of minimum of maximum horizontal stroke wide (length/horizontal stroke of groove 35 is wide) W31a > neck 33 of the wide W32a > of the horizontal stroke head 31 of main part 32.Meet the relation of depth direction width W 36b of depth direction width W 34b > cast gate trace 36 of the depth direction width W 35 > shoulders 34 of groove 35.Meet the relation of x direction of principal axis width (this width is consistent with width W 35) of the depth direction width 36b < side 35b of cast gate trace 36.Meet the relation of z direction of principal axis width (this width is consistent with width W 31a) of the wide 36a < side 35b of horizontal stroke of cast gate trace 36.

Fig. 4 schematically shows the state that chain band 101a is meshed with each chain tooth row of chain band 101b of observing of overlooking.As shown in Figure 4, between the sprocket 30a becoming in left side and the sprocket 30c that is adjacent to this sprocket, meshing the state of the sprocket 30b on right side.Illustration, in Fig. 4, the shoulder 34a (being positioned at the shoulder of upside in Fig. 4) of the sprocket 30c in left side is accommodated by the groove 35 of the sprocket 30b on right side, and the shoulder 34b of the sprocket 30a in left side (being positioned at the shoulder of downside in Fig. 4) is accommodated by the groove 35 of the sprocket 30b on right side.According to identical logic, the shoulder 34a of the upside of sprocket 30b (being positioned at the shoulder of upside in Fig. 4) is accommodated by the groove 35 of sprocket 30a, and the shoulder 34b of the sprocket 30d on right side (being positioned at the shoulder of downside in Fig. 4) is accommodated by the groove 35 of the sprocket 30a in left side.

If take, to the state of slide fastener 110 external force actions, be not prerequisite, so as shown in Figure 4, between the cast gate trace 36 of sprocket 30a and the shoulder 34b of sprocket 30d, along z direction of principal axis, be provided with the gap (interval) of width W 91.Similarly, between the cast gate trace 36 of sprocket 30a and the shoulder 34a of sprocket 30b, along z direction of principal axis, be provided with the gap of width W 92.That is to say, in the axial both sides of z, between cast gate trace 36 and shoulder 34, be provided with gap.Thus, can restraint measure contacting between the cast gate trace 36 of the overshooting shape of the side of groove 35 and the shoulder 34 of the sprocket 30 of adjacency.

Fig. 5 is that the summary section that schematically shows the xz plane that comprises 2 chain lines of Fig. 4 forms.If take, to the state of slide fastener 110 external force actions, be not prerequisite, so as shown in Figure 5, between the side 34m of the side of groove 35 35a (being arranged in the side of upside in Fig. 5) and shoulder 34 (being positioned at the side of upside at Fig. 5), be provided with the gap of y direction of principal axis width W 94.The side 35b of groove 35 (being arranged in the side of downside in Fig. 5) is also identical with the side 34n (being positioned at the side of downside at Fig. 5) of shoulder 34.Between the summit of cast gate trace 36 and the side 34n of shoulder 34 (being positioned at the side of downside in Fig. 5) of side 35b that is arranged on groove 35, be provided with the interval of y direction of principal axis width W 93.In addition, the front end face 34p of shoulder 34 and the bottom surface 35c of slot part 35 separate predetermined distance and mutual subtend.In addition, even if the upper and lower side of shoulder 34 deflection, also utilize described y direction of principal axis width W 93 and W94 and between forming fully every.Here, the vertical wide H35 that becomes groove 35 from the size on the summit of the outstanding cast gate trace 36 of the side 35b of groove 35 deducts size and size gained of vertical wide H34 and described y direction of principal axis width W 93 and the W94 of shoulder 34, and the vertical wide H35 that the outstanding size of this cast gate trace is preferably no more than groove 35 deducts half of size of the vertical wide H34 gained of shoulder 34.

Below, with reference to Fig. 6 to Figure 12, a concrete example of the manufacture method of described chain band is described.Chain band is Coinjection molding apparatus 200 as shown in Figure 6 of example and manufacturing.As shown in Figure 6, Coinjection molding apparatus 200 is configured to and comprises the platform 201 that is fixed wtih bed die 50 (also referred to as the first mould) and the platform 202 that is fixed wtih mold 70 (also referred to as the second mould), and the interval of capable of regulating platform 201 and platform 202.Coinjection molding apparatus 200 for example comprises computer, and according to the feedback signal from sensing element (such as optical sensor, pressure sensor etc.), accurately platform is moved to control.Between platform 201 and platform 202, configuring the chain cloth 20 of the state of plane earth expansion.Therefore, for example, by making platform 202 to chain cloth 20 side shiftings, and synchronously make therewith platform 201 to chain cloth 20 side shiftings, and chain cloth 20 can be sandwiched between bed die and mold.By injection moulding portion 206, make the injection packing material melting dropping into via hopper 207, and be supplied in the die cavity of stacked in this way mold and bed die, and on chain cloth 20 injection moulding sprocket, thereby manufacture chain band.

In Fig. 7, represent from the schematic diagram of the i.e. top observation of mold 70 sides bed die 50.In Fig. 8, expression is along the summary section of the mold integral of 2 chain line X8-X8 of Fig. 7.In Fig. 9, expression is along the summary section of the mold integral of 2 chain line X9-X9 of Fig. 7.As shown in Figure 7, at the smooth mould composition surface 50z of bed die 50, the die cavity row 51m corresponding with the chain tooth row that is arranged on chain band 101a and the die cavity row 51n corresponding with the chain tooth row that is arranged on chain band 101b are being set.Between die cavity row 51m and die cavity row 51n, the space 51r that accommodates core 60 is being set.Die cavity row 51m is that a plurality of die cavitys 51 are arranged and formed with fixed intervals along z direction of principal axis.The die cavity adjoining each other that forms die cavity row 51m is to connect by accommodating half groove 52 of the core rope 22 of chain cloth 20.In addition, in bed die 50, also forming the groove (with reference to Fig. 8 and Fig. 9) of the flat part 21 of accommodating chain cloth 20.Die cavity is from the recessed recess in mould composition surface, and by bottom surface and side and stipulate.

In the 51r of the space of bed die 50, configuring core 60.Core 60 is Different Individual with bed die 50.In the contrast with mold 70, also core 60 can be interpreted as to a part for bed die.Core 60 is along z direction of principal axis, to be banded to extend, and be housed in the 51r of space, arranging and can slide up and down the upper end of mobile support sector, Ji Gai support sector to the outstanding protuberance 66 of left and right directions (forming the direction of die cavity towards sprocket) of support sector, and the cross-sectional shape of core 60 is T word shape (with reference to Fig. 8 and Fig. 9).As shown in Figure 7, in core 60, the cast gate row 61m corresponding with the die cavity row 51m in left side and the cast gate row 61n corresponding with the die cavity row 51n on right side are being set.Each cast gate 61 is to arrange accordingly with each die cavity 51.For example, in Fig. 7, cast gate 61p is connected in the die cavity 51p that is positioned at its left side, and cast gate 61q is connected in the die cavity 51q that is positioned at its left side.Other cast gates are also connected in the die cavity of the side that is positioned at cast gate in the same way.In core 60, the example as the equipment of release, is arranging the knockout pin (release equipment) 62 in the through hole that is configured in core 60 with fixed intervals along z direction of principal axis.When the situation shown in Fig. 7, when die cavity adjacent on x direction of principal axis is made as to one group, corresponding to two groups of die cavity groups, a knockout pin 62 is being set.In addition, on bed die 50, during stacked mold 70, the upper surface 60a of the banded core 60 extending along z direction of principal axis shown in Fig. 7 becomes the face of regulation runner.

The die cavity 71 of patrix comprises and forms head 31, main part 32, the neck 33 of sprocket 30, head forming portion, main part forming portion, neck formation portion, the shoulder forming portion of half (half that is upside than the both forward and reverse directions center of chain cloth 20) of the short transverse of shoulder 34.The die cavity 51 of counterdie comprises and forms head 31, main part 32, the neck 33 of sprocket 30, head forming portion, main part forming portion, neck formation portion, the shoulder forming portion of half (half that is downside than the both forward and reverse directions center of chain cloth 20) of the short transverse of shoulder 34.The die cavity 51,71 of patrix and counterdie comprises and forms the surperficial bottom of sprocket 30 and the sidepiece rising from four limits of this bottom, and in the side of adjacent die cavity side, forming the groove 52 that supplies the core rope 22 of chain cloth 20 to enter.Core 60 comprise between upper die and lower die and to patrix and counterdie die cavity separately relatively to and the sprocket that produces forms outstanding protuberance 66 in die cavity.In protuberance 66, have at head, form groove 35 expose face 67a, 67c.Expose the part that face is protuberance 66, and be while clipping protuberance 66 in the die cavity 51,71 of patrix and counterdie, than the sidepiece (especially for forming the sidepiece of the part of head) that forms die cavity 51,71, be more positioned at the part of die cavity inner side.Under state in the middle of the protuberance that makes core 60 is positioned at, these patrixes and counterdie are carried out to mould joint, and supply with packing material, thus in the edge of chain cloth injection moulding sprocket portion.And, utilize protuberance 66 (it exposes face) and form slot part 35 in the front of the head of sprocket.

First, as shown in Figure 8, in bed die 50, configuring under the state of core 60, to clip the form of chain cloth 20, making bed die 50 carry out mould with mold 70 to engage.Example as described with reference to Figure 6, by platform 201,202 is synchronously approached with respect to chain cloth 20, and forms the state of Fig. 8.When the situation shown in Fig. 8, make to be formed on the die cavity 51 on mould composition surface of bed die 50 relative with the die cavity 71 on mould composition surface that is formed on mold 70 to, thus, form sprocket and form die cavity 85.In addition, represent to manufacture the situation of two chain bands here simultaneously, at this, accordingly the sprocket that is positioned at left side is formed to die cavity and be made as sprocket formation die cavity 85a, the sprocket formation die cavity that is positioned at right side is illustrated as to sprocket and forms die cavity 85b.Via shared stream, each sprocket is formed to die cavity 85a, 85b and supply with packing material, for example thermoplastic resin.In addition, be made as the effusion etc. of the air in the time of can suitably guaranteeing that mould engages.

As shown in Figure 8, in mold 70, the running channel 81 to mould 500 interior importings by the thermoplastic resin of discharging from nozzle 204 is being set, and the runner 82 to orientation (length direction of the chain cloth 20) guiding of sprocket by the thermoplastic resin of supplying with from running channel 81 is being set.Runner 82 is to form continuously along z direction of principal axis.In addition, with regard to sprocket forms die cavity 85, the stream of thermoplastic resin is that the space being formed continuously by running channel 81, runner 82, cast gate 61 forms.In addition, as shown in Figure 9, runner 82 is to be divided into trapezoidal shape.In addition, knockout pin 62 is in the openings (knockout pin accepting hole) that is configured in core 60.

In addition, as shown in figure 10, after mould engages, the protuberance 66 of core 60 configures to form the interior outstanding mode of die cavity 85 to sprocket.Here, sprocket forms the part that die cavity 85 is the head 31 that forms sprocket 30, main part 32, neck 33, shoulder 34, and become the part of protuberance 66 by the core 60 formation head 31 in this sprocket forms die cavity to be flatly outstanding with mould composition surface, and after injection moulding, at the head 31 of sprocket 30, form the part of grooves 35.Here, represent to manufacture the situation of two chain bands simultaneously, correspondingly the protuberance that is positioned at left side is made as to protuberance 66a, the protuberance that is positioned at right side is illustrated as to protuberance 66b.Protuberance 66a has in sprocket forms die cavity 85 face that exposes that exposes (being positioned at inner side) from the side of die cavity.This exposes mask upper surface (side) 67a, front end face 67b and lower surface (side) 67c.This upper surface 67a is a part of the upper surface 60a of core 60, with mould composition surface level and relative with the bottom surface of the die cavity of mold to.Lower surface 67c is a part of lower surface 66c for the protuberance 66 of core 60, with mould composition surface level and relative with the bottom surface of the die cavity of bed die to.Front end face 67b is by the face being connected on y direction of principal axis (direction vertical with mould composition surface) between described upper surface 67a and lower surface 67c, and relative with the core rope of chain cloth 20 to.Cast gate 61 is for connecting the through hole of core 60, the inflow entrance 61a of cast gate 61 is arranged on the upper surface 60a of the core consistent with the bottom surface of runner 82 60, the outlet 61b of cast gate 61 be arranged on core 60 protuberance 66 lower surface 66c and exposing the lower surface 67c (with reference to Fig. 8) of face.When injection moulding, the resin of melting is to enter in cast gate 61 from this inflow entrance 61a, from outlet 61b flows out to cast gate 61, and sprocket is formed to the resin of supplying with melting in die cavity.And this cast gate 61 is that below (direction that the protuberance 66 of core 60 is outstanding and the direction towards bed die from mold) is oblique line shape and extends laterally.In addition, in Figure 10, cast gate 61 is that below is oblique line shape extension laterally, but the extension form of cast gate 61 is arbitrarily, should not be defined in this.For example, also can make cast gate 61 connect towards the front end face 67b that exposes face from the upper surface 60a of core.The described explanation of doing about the protuberance 66a in left side is also applicable to for the protuberance 66b on right side.

If Fig. 8 is to carrying out after mould joint as shown in Figure 10, to the interior supply thermoplastic resin of mould 500, as shown in figure 11, the space in mould 500 is filled by thermoplastic resin.Then, cooling die 500, solidifies thermoplastic resin.Thus, configuring the cured portion corresponding with running channel 81 (hereinafter referred to as running channel portion) 91, the cured portion (hereinafter referred to as flow path portion) 92 corresponding with runner 82, the cured portion (hereinafter referred to as gate part) 93 corresponding with cast gate 61 and forming with sprocket cured portion (hereinafter referred to as sprocket portion) 94 tectosomes that form continuously that die cavity 85 is corresponding mould 500 is interior.

Afterwards, die sinking as shown in Figure 12, for example, make bed die 50, mold 70, chain cloth 20 be separated from each other.Then, as shown in figure 13, by equipment such as air cylinder, oil hydraulic cylinder arbitrarily, apply flexibly motor etc. power feed mechanism or apply flexibly the force application mechanism of elastic force, knockout pin 62 is pushed away on upward.Thus, utilize the front end face of knockout pin 62 that the bottom surface of flow path portion 92 is pushed upward, make flow path portion 92 from core 60 separation.In this process, gate part 93 is given to the power that flow path portion 92 is pushed upward.So gate part 93 is cut off at gate part 93 and the coupling part/boundary member of sprocket portion 94.Reason is for example that the diameter of outlet of cast gate 61 is less than the diameter of the introducing port of cast gate 61, but is not limited thereto.So, by die forming, chain cloth is arranged to sprocket and arrange, and, in this step, on mould, carried out gate cutting.Then, chain band to be carried to the subsequent step arbitrarily of cutting gate trace, but in order enhancing productivity, also can be omitted this step.As mentioned above, cast gate trace 36 is not positioned at the outer surface of sprocket 30, and is positioned at the face (being the side of groove 35) of the groove 35 of the head 31 that forms sprocket 30 here.Therefore the necessity of, specially cast gate trace 36 being removed is relatively low.

In Figure 14, represent that gate part 93 is connected in the state of sprocket portion 94.If will push away on knockout pin 62 as described with reference to Figure 13, gate part 93 is pulled to the direction shown in the arrow of Figure 14 (forming the direction of cast gate 61) so, and produces " shearing " at gate part 93 and the coupling part/boundary member of sprocket portion 94.By this shearing, gate part 93 is pulled away from from the side of the groove 35 of sprocket portion 94.Suppose that described situation is that root at gate part 93 chaps, thus, the root portion of disjunction gate part 93, breaks gate part 93 from the side of the groove 35 of sprocket portion 94.In addition, should not pass through the impact of this principle explanation itself or its appropriate property, and limited interpretation this case invention (also identical in the following description).

With reference to Figure 15, the variation example of present embodiment is described.In described embodiment, be to manufacture one group of chain band by shared mould simultaneously, but as shown in Figure 15, also can manufacture the only chain band one group of chain band from a mould.Present embodiment also can be carried out other various variations, for example, also the flow export of the cast gate shown in Figure 10 61 can be arranged on to upper surface 67a or front end face 67b.Cast gate 61 may not be linearity, also can be bending.Core 60 is completely without being T word shape.The quantity of the formation mould of the upper die and lower die of formation die device etc. is any.Create conditions and should depend on the material of use and suitably adjust.

< the second embodiment >

With reference to Figure 16 to Figure 25, the second embodiment is described.Figure 16 is summary side elevation and the top view of sprocket.Figure 17 observes the generalized schematic of bed die and core from mold.Figure 18 means the generalized schematic that the section of the mould of closure state forms, and represents along the summary section of the X18-X18 of Figure 17.Figure 19 means the generalized schematic that the section of the mould of closure state forms, and represents along the summary section of the X19-X19 of Figure 17.Figure 20 means the block diagram of the state that mould engages.Figure 21 means that packing material is filled to the block diagram of the state in mould.Figure 22 means the block diagram of the state of the unit that moves moulds.Figure 23 means the block diagram of the die opening state of mould.Figure 24 means the generalized schematic that the section of the sprocket of the state that is connecting gate part forms.Figure 25 is the generalized schematic that the dotted line from the direction of arrow along Figure 24 is observed.

In the present embodiment, with the first embodiment differently, after resin filling, by moving of die unit, carry out gate cutting (with reference to Figure 22).When this situation, also can estimate and obtain the effect identical with the first embodiment.Below, the aspect different from the first embodiment described, the aspect identical with the first embodiment be enclose identical with the first embodiment with reference to numbering, and illustrate also identical, about the identical explanation with reference to numbering, omitted, optionally, be made as with reference to the first embodiment.In addition, in the present embodiment, substantially also can obtain the effect identical with the first embodiment.Following the 3rd embodiment, the 4th embodiment are also made as identical.

As shown in figure 16, sprocket 30 comprises: main part 32, is arranged on the tow sides of the inner side edge of chain cloth 20; Head 31, the chain cloth 20 from main part 32 to the other side's side extends setting and meshes with the sprocket 30 of subtend; Neck 33, be formed between main part 32 and head 31, and width is narrow compared with head 31; One group of shoulder 34 (34a, 34b), configures to clip the mode of neck 33; And slot part 35, be formed on the leading section of head 31, and supply the shoulder 34 of the sprocket 30 of the other side's side to embed.Different from the first embodiment, cast gate trace 36 is arranged on the side 35a of y axle upside of slot part 35 but not the side 35b of the y axle downside of slot part 35.Cast gate trace 36 is non-flat forms than side 35b, such as being projection, depression, matsurface etc.Here, illustratively cast gate trace 36 is illustrated as to male member.The concrete form of cast gate trace 36 can change according to manufacturing step, and the according to circumstances planarization by additional step.

As shown in figure 16, the edge 36m (with reference to the lower part of Figure 16) of cast gate trace 36 between side 35b and front end face 31c, and towards the bottom surface of groove 35 35c, extend configuration from this edge 36m.During this situation, even if during the situation that is overshooting shape at cast gate trace 36, also because be to become overshooting shape from the side 35a of groove 35 towards the side of subtend 35b, so can suppress cast gate trace 36 from forwards flying out in groove 35 to the front end face 31c that exceeds head 31 as far as possible.

As shown in FIG. 17 and 18, after mould engages, the protuberance 66 of core 60 configures to form the interior outstanding mode of die cavity 85 to sprocket, and protuberance 66a has in sprocket forms die cavity 85 upper surface (side) 67a, front end face 67b and lower surface (side) 67c exposing from mold 70 and bed die 50, described aspect is identical with the first embodiment, and cast gate 61 is different from the first embodiment, itself and non-through hole, and be the recess of the trapezoidal shape that forms of the upper surface 60a cutting of core 60 (from the center of the left and right directions of core toward the outer side and the trapezoidal shape that front end attenuates).As shown in Figure 18 and Figure 19, mold 70 is to be divided into mold 70a～70c.In addition, each mold 70a and mold 70b arrange corresponding to die cavity, are made as left side mold 70a and right side mold 70b.Mold 70c, corresponding to runner 82, is configured between left side mold 70a and right side mold 70b, is made as central mold 70c.And bed die 50 also, corresponding to die cavity row, is made as left side bed die 50a and right side bed die 50b, and be configured in respectively the left and right of core 60.As utilize as shown in the part of dotted line ring amplifying observation of Figure 20, cast gate 61 is utilize the recess (this recess is to be stipulated by inclined-plane 61d, bottom surface 61e, inclined-plane 61f) of the upper surface 60a be arranged on core 60 and be positioned at each lower end 70a1, the 70c1 of mold 70a, 70c on this recess and divide, and as shown in figure 18, forming inflow entrance 61a and outlet 61b.Thus, inflow entrance 61a is arranged on the upper surface 60a of the core consistent with the bottom surface of runner 82 60, and outlet 61b is arranged on sprocket and forms in die cavity.

Manufacturing step be with the first embodiment similarly, first each mould is carried out to mould joint, form the state shown in Figure 20.Then, with the first embodiment similarly, to the interior supply resin of mould 500, and cooling die.Thus, as shown in figure 21, in mould 500, shaping thermoplastic resin solidifies the tectosome forming.

Then, as shown in figure 22, the state that one side keeps mold to engage with bed die mould, simultaneously by die unit U10～U30 planar (with the face of mould composition surface level) be separated from each other.In addition, die unit U10 (first module) is the unit of stacked left side bed die 50a and left side mold 70a.Die unit U20 (second unit) is the unit of stacked core 60 and central mold 70c.Die unit U30 (Unit the 3rd) is the unit of stacked bed die 50b and mold 70b.

Illustration, makes mould U10 separated to the left with respect to the die unit U30 of stationary state, then, with respect to the die unit U30 of stationary state, makes mould U20 separated to the right.By this cell moving, gate part 93 and the coupling part/boundary member of sprocket portion 94 are applied to shearing, make gate part 93 from 94 disjunctions of sprocket portion.Then, as shown in figure 23, carry out die sinking.So, can to chain cloth, sprocket be set by die forming and arrange, and, in this step, on mould, carry out gate cutting.By the shirtsleeve operation moving moulds, carry out gate cutting.Thus, can estimate the raising of the production efficiency of chain band and then slide fastener.In addition, under die opening state, take out chain band.As the method for taking out, for example, can take out by the following method: will on chain cloth 20, push away; Or at the state of minute having no progeny while temporarily making each die unit U10, U20, U30 return to injection moulding, under this state, make mold 70 and bed die 50 separate and die sinking along the vertical direction, then make core 60 risings.

In Figure 24 and Figure 25, represent that gate part 93 is connected in the state of sprocket portion 94.If move moulds as described with reference to Figure 23 unit, so for example sprocket portion 94 is pulled to the direction shown in the dotted arrow of Figure 24, and produces " shearing " in sprocket portion 94 with the coupling part of gate part 93.By this shearing, gate part 93 is pulled away from from the side of the groove 35 of sprocket portion 94.Suppose that described situation is the movement by described die unit, gate part 93 is clipped by the lower end 70a1 of left side mold 70a and the upper surface 66 of core 60 with the coupling part/boundary member of sprocket portion 94, and chap at the root of gate part 93, thus, the root portion of disjunction gate part 93, thus gate part 93 is broken from the side of the groove 35 of sprocket portion 94.

< the 3rd embodiment >

With reference to Figure 26 and Figure 27, the 3rd embodiment is described.Figure 26 means that packing material is filled to the block diagram of the state in mould.Figure 27 means the block diagram of the state of the unit that moves moulds, and represent Figure 26 only left side half.

In the present embodiment, adopt the core 60 of the cast gate with inclination through hole 61 of the first embodiment, and adopt the gate cutting carrying out that moves that passes through die unit (Unit the first～three) of the second embodiment.When this situation, also can obtain the effect identical with first and second embodiment.As shown in figure 26, under the state engaging at each mould mould, to potting resin in mould 500, cooling die 500 and potting resin is solidified.Then, as shown in figure 27, make die unit U10 separated from die unit U30.Though not shown, also make die unit U20 separated from die unit U30.Then, open mould, take out chain band.Shape that can be contemplated to cast gate trace 36 etc. is different knifeedge from the situation of the first embodiment.

< the 4th embodiment >

With reference to Figure 28 to Figure 31, the 4th embodiment is described.Figure 28 means the summary upper surface of sprocket and the schematic diagram that section forms.Figure 29 means the block diagram of the state that mould engages.Figure 30 means that packing material is filled to the block diagram of the state in mould.Figure 31 means the block diagram of the state of the unit that moves moulds.

In the present embodiment, with described embodiment (especially the second embodiment) differently, manufacture/provide the slide fastener 110 with water proofing property.Corresponding to the difference of slide fastener type, the formation of sprocket 30, mould etc. is different.When this situation, also can obtain the effect identical with described embodiment.

As shown in figure 28, with described embodiment similarly, sprocket 30 is to install for chain cloth 20.With described embodiment differently, the inner side edge 20d of chain cloth 20 is more positioned at inner side (front of the head 31 of sprocket) than the shoulder 30a of sprocket 30, and outstanding to the inside from the bottom surface 35c of groove 35.Utilize this outstanding inside piece 20d, when slide fastener is closed, the inside piece 20d of left and right connects airtight mutually, and performance water proofing property.In the rear end of main part 32, separated Yi Zu 37 (37a, the 37b) of foot by the depression of division crotch are being set.As shown in the lower part of Figure 28, the sheet members of chain cloth 20 for utilizing the sandwich layer 21b of watertight composition 21a coating sheet to form.Sandwich layer 21b manufactures for braiding the chain cloth form, and emitting tank 21a is the synthetic resin that comprises thermoplastic elastomer (TPE) or rubber etc.In addition, this formation is to be disclosed in International Publication description W02011/077570 (application numbers PCT/JP2009/071679), and the integral body of this announcement is incorporated into this in the mode of reference.

As shown in figure 29, at the front end face 67b of the protuberance 66a of core 60, the recess of the medial end of accommodating chain cloth 20 is being set.After making like that as shown in figure 29 each mould mould engage, with the second embodiment similarly, potting resin in mould 500 like that as shown in figure 30, cooling die 500 and potting resin is solidified.Then, as shown in figure 31, simultaneously or make successively die unit U10, U20 separated from die unit U30.Think that the shape etc. of the shape etc. of cast gate trace 36 and cast gate trace in the second embodiment is identical.

< the 5th embodiment >

With reference to Figure 32 and Figure 33, the 5th embodiment is described.Figure 32 means the block diagram of the state that mould engages.Figure 33 means that packing material is filled to the block diagram of the state in mould.In the present embodiment, with described the 4th embodiment differently, use the mould suitable with the mould shown in the first embodiment.When this situation, also can obtain the effect identical with described embodiment.

After making like that shown in figure 32 each mould mould engage, with the first embodiment similarly, potting resin in mould 500 like that as shown in figure 33, cooling die 500 and potting resin is solidified.Then, as shown in Figure 13 knockout pin is released as the first embodiment.Or, replace this, as shown in the second to the 4th embodiment, move moulds unit and carry out gate cutting.

If according to described instruction, just so as long as can apply various changes to each embodiment for those skilled in the art.The quantity that is arranged on the die cavity of mold and bed die is a plurality of (N) arbitrarily, and N is more than 2 natural number, that is, the quantity of die cavity is more than 2.And, the die cavity of mold and bed die relatively to and the sprocket that produces forms the quantity of die cavity individually to supply with the quantity of the cast gate of packing material is equal number with form die cavity to this sprocket, each cast gate is linked to shared runner, when injection moulding, potting resin is through in runner, from each cast gate, be supplied to sprocket and form in die cavity, thus injection moulding sprocket.

The type of the type of the sprocket of slide fastener and chain cloth is arbitrarily, also can have the sealings such as water proofing property, air-tightness.Packing material also can be the packing material (such as energy ray-curable resin, metal etc.) beyond thermoplastic resin.The concrete example of thermoplastic resin is polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, Teflon (Teflon) (registration mark), ABS (Acrylonitrile-Butadiene-Styrene, acrylonitrile-butadiene-styrene (ABS)) resin, AS (Acrylonitrile-Styrene, acrylonitrile-styrene) resin, acrylic resin etc.In mould, make the curing method of packing material for any.The step that mould engages should broadly be understood, and should not be construed as, only instigates flat mould stacked.Specifically being configured to arbitrarily of the stream of the packing material of arrival cast gate.The symbol adding in claims is for reference, should not carry out reference with the object of limited interpretation claims.In addition, in order to differentiate, whether be the cast gate trace in described explanation, can estimate injection molding sprocket, beyond beyond the medial surface at described groove or side, have or not and be in a ratio of the position of non-flat forms (such as projection, depression, matsurface etc.) with medial surface or side and differentiate.That is to say without the position of non-flat forms, or in side, have the position of non-flat forms and beyond it during without the situation at the position of non-flat forms, knownly when injection moulding, at the medial surface of groove or the described position of side, forming cast gate beyond the medial surface of groove.In addition, when carrying out the situation of planarization by additional step in the mode that the vestige of cast gate trace is eliminated, also because the position that has a cast gate trace with other positions in surface state, surface roughness is different, thus can by this position specific be the position that is forming cast gate trace.In addition, with regard to described aspect, cast gate trace also comprises the situation through planarization.In addition, except range estimation, also can, by measuring surface roughness, the position of cast gate trace and the position beyond it be compared and be differentiated.

The protuberance 66Shi support sector of core 60 and protuberance are section T word shape integratedly, but are not limited thereto, and also can be other.In patrix and counterdie, except comprising forming the die cavity of sprocket, also can comprise the die cavity in order to the detachable inlay of moulding or upper backstop, lower backstop etc.

[explanation of symbol]

110 slide fasteners

101 chain bands

10 saddles

20 chain cloth

200 Coinjection molding apparatus

30 sprockets

31 heads

32 main parts

33 necks

34 shoulders

35 grooves

36 cast gate traces

37 foots

500 moulds

50 bed dies

51 die cavitys

60 cores

61 cast gates

61a inflow entrance

61b outlet

62 knockout pins

66 protuberances

70 molds

71 die cavitys

81 running channels

82 runners

85 sprockets form die cavity

92 flow path portion

93 gate parts

94 sprocket portions

Claims

1. a manufacture method for sprocket, comprises the following steps:

Mould engagement step, make arranging on mould composition surface first mould (50) of a plurality of die cavitys (51), second mould (70) of a plurality of die cavitys (71) is being set on mould composition surface, and to described first and second mould (50, 70) described die cavity (51 separately, 71) relatively to and the sprocket that produces forms outstanding core (60) in die cavity (85) and carries out mould joint, and in described core (60), arranging and be connected in shared runner (82) and form to a plurality of described sprockets a plurality of cast gates (61) that die cavity (85) is supplied with packing material, what the flow export (61b) that is arranged on the described cast gate (61) of described core (60) was arranged on the described core (60) that exposes in described sprocket forms die cavity (85) exposes face (67a, 67c), and

By described mould engagement step, make described shared runner (82) via a plurality of described cast gates (61), be connected under the state of a plurality of described sprockets formation die cavitys (85), via described runner (82) and described cast gate (61), to described sprocket, forming die cavity (85) and supply with packing material.

2. the manufacture method of sprocket according to claim 1, characterized by further comprising following steps: will at least at described sprocket, form packing material described in die cavity (85) and described cast gate (61) and solidify and tectosome boundary disjunction with described cast gate (61) at described sprocket formation die cavity (85) of generation.

3. the manufacture method of sprocket according to claim 2, it is characterized in that comprising the steps: making described first and described the second mould (50,70) at least one mould and described core (60) be separated from each other, and disjunction forms tectosome continuous between die cavity (85) and described cast gate (61) at described sprocket.

4. the manufacture method of sprocket according to claim 2, it is characterized in that comprising the steps: making the part of the moulding in runner (82) and cast gate (61) of described tectosome to leave from described core (60), disjunction forms tectosome continuous between die cavity (85) and described cast gate (61) at described sprocket.

5. according to the manufacture method of the sprocket described in any one in claim 1 to 4, it is characterized in that: arranging described cast gate (61) described flow export (61b) described in expose face (67a, 67c) be with respect to the bottom surface of the described die cavity (51,71) of the described first or second mould (50,70) and relatively to.

6. according to the manufacture method of the sprocket described in any one in claim 2 to 5, it is characterized in that: the described step of supplying with described packing material to described sprocket formation die cavity (85) via the described cast gate (61) of described core (60) is to carry out under following state: the chain cloth (20) that described sprocket will be installed utilizes described first and second mould (50,70) described mould composition surface separately to clip, and the core rope (22) of described chain cloth (20) is configured in described sprocket formation die cavity (85).

7. a sprocket, manufactures by the manufacture method of the sprocket described in any one in claim 1 to 6,

Described sprocket (30) comprising:

Main part (32);

Neck (33), extend, and width is narrower than described main part (32) from described main part (32);

Head (31), extend, and width is wider than described neck (33) from described neck (33); And

One group of shoulder (34), extends from described main part (32), and to clip the form setting of described neck (33);

Front end face (31c) in described head (31), is arranging the slot part (35) extending along the configuration direction of shoulder (34) described in a group, at described slot part (35), cast gate trace (36) is being set.

8. sprocket according to claim 7, is characterized in that: the cast gate trace (36) that is arranged on slot part (35) is more amesiality and arrange than the short transverse center of slot part (35) in the short transverse of sprocket.

9. according to the sprocket described in claim 7 or 8 (30), wherein said cast gate trace (36) is positioned at the central authorities of the bearing of trend of described slot part (35).

10. a sprocket, comprising:

Main part (32);

The slot part (35) extending along the configuration direction of shoulder (34) described in a group is being set at described head (31), at described slot part (35), cast gate trace (36) is being set.

11. sprockets according to claim 10, is characterized in that: described cast gate trace (36) is to be formed on partly described slot part (35).

12. according to the sprocket described in claim 10 or 11, it is characterized in that: described cast gate trace (36) is positioned at the central authorities of the bearing of trend of described slot part (35).

13. according to claim 10 to the sprocket described in any one in 12, it is characterized in that: described cast gate trace (36) is in a ratio of non-flat forms with the inner face (35a, 35b) of described slot part (35).

14. according to claim 10 to the sprocket described in any one in 13, it is characterized in that: described cast gate trace (36) is that a part for the edge of front end face (31c) from the head is present in inside slot part (35) continuously.

15. according to claim 10 to the sprocket described in any one in 13, it is characterized in that: described cast gate trace (36) is that the edge of front end face (31c) is from the head left and exists.

16. 1 kinds of moulds, comprising:

The first mould (50), is arranging a plurality of die cavitys (51) on mould composition surface;

The second mould (70), is arranging a plurality of die cavitys (71) on mould composition surface;

Core (60), to described first and second mould (50,70) described die cavity (51,71) separately relatively to and the sprocket that produces forms in die cavity (85) outstanding;

In described core (60), arranging and be connected in shared runner (82) and form to a plurality of described sprockets a plurality of cast gates (61) that die cavity (85) is supplied with packing material; And

What the flow export (61b) that is arranged on the described cast gate (61) of described core (60) was arranged on the described core (60) that exposes in described sprocket forms die cavity (85) exposes face (67a, 67c).

17. moulds according to claim 16, is characterized in that: described in expose face (67a, 67c) be bottom surface with the described die cavity (51,71) of described the first mould or described the second mould (50,70) relative to.

18. moulds according to claim 17, is characterized in that: described cast gate (61) is for being formed on the surperficial recess of the flow passage side of described core (60).

19. moulds according to claim 17, is characterized in that: described cast gate (61) is for being formed on the through hole of described core (60).

20. 1 kinds of Coinjection molding apparatus, comprise the mould described in any one in claim 16 to 19.