CN1518492A

CN1518492A - Transfer molding machine with features for enhanced cull removal

Info

Publication number: CN1518492A
Application number: CNA028123026A
Authority: CN
Inventors: 何振华; ・箩丝蓝・彬; 伊斯迈·箩丝蓝·彬; 王紫耀
Original assignee: Advanced Systems Automation Ltd Singapore
Current assignee: Advanced Systems Automation Ltd Singapore
Priority date: 2001-06-22
Filing date: 2002-06-21
Publication date: 2004-08-04
Anticipated expiration: 2022-06-21
Also published as: TW537958B; WO2003000479A3; CN1295067C; WO2003000479A2; KR20040014570A; SG103835A1; KR100641857B1; AU2002314697A1

Abstract

A transfer molding machine (10) with an injection mold plate (12). The injection mold plate has ejection pins (22,24) for ejecting a cull in a first direction (40). Each of the ejection pins (22,24) has a sprue abutment (50) with a notch (52). The notch is oriented to enable dislodging of the cull in a second direction (54), substantially normal to the first direction (40) and away from the sprue abutment (50). A method (100) for cull removal by transfer molding machine (10) upon curing a molding ends with the cull being moved out of the transfer molding machine (10) using a movable bar (200) with stubs (202).

Description

Transfer moIding machine with excess stock excision feature of enhancing

Technical field

The present invention relates to a kind of model component.More particularly, the present invention relates to a kind of transfer moIding machine that strengthens excess stock excision feature that has.

Background technology

The transfer moIding machine that has the model that constitutes die cavity is a known technology.In moulding process, use this transfer moIding machine to form the moulded product that is shaped according to die cavity.Model generally comprises at least two templates that clamp in the part moulding process.The mold compound of molten condition is injected in the die cavity.When mold compound is solidified, separate template so that can eject the moulded product that mold compound forms.

The course of conveying of mold compound from the model jar to die cavity, the passage that generally uses one or more running channels to form is carried mold compound.As a result, when separate forming the template of die cavity, the mold compound in the faying face also solidifies in the running channel or between running channel and the model jar, has still formed undesirable molding part.Usually this undesirable molding part is called excess stock.

Must excise excess stock from transfer moIding machine, so that can carry out the molded circulation of another time.But excision may be very to bother, and has therefore reduced the production capacity of transfer moIding machine.In addition, the excess stock excision should not can cause excess stock to be broken into small pieces or fragment.Excess stock sheet that these are little or excess stock fragment be to the follow-up molded adverse effect that causes of transfer moIding machine, even may cause stopping of follow-up molded production.

Except the problems referred to above, for existing transfer moIding machine by down gate (direct gating) molding, the excess stock excision is a general problem.Down gate generally causes forming the excess stock with one or more juts that is called cast gate.This cast gate may tangle in the excision process mutually, and perhaps the parts with transfer moIding machine tangle mutually.As a result, the existence of cast gate has limited the excess stock excision in the down gate moulding.

Therefore, obviously need a kind of transfer moIding machine that strengthens excess stock excision feature that has, so that can improve the molding production capacity of transfer moIding machine.This feature also should have the ability of the excess stock of the cast gate that forms as the molded result of down gate from the transfer moIding machine excision.

Summary of the invention

The objective of the invention is to provide a kind of transfer moIding machine, and a kind of method of excising excess stock when moulded product solidifies by transfer moIding machine.

Therefore, on the one hand, the invention provides a kind of transfer moIding machine, comprising:

At least one has at least one template that is used for ejecting from least one template the knock pin of excess stock on a first direction, and each at least one knock pin has a cast gate joint portion;

Wherein the cast gate joint portion comprises a breach, and the direction of breach makes and can remove at least one excess stock from the cast gate joint portion on a second direction, second direction in fact with the first direction quadrature.

On the other hand, the invention provides a kind of method of excising excess stock when moulded product solidifies by transfer moIding machine, this method comprises the steps:

Separate a plurality of templates, so that at least one ingate of the one or more templates from a plurality of templates takes off moulded product;

The knock pin that utilizes at least one to have this cast gate jaggy joint portion ejects at least one excess stock that combines with moulded product on first direction; With

On second direction from the cast gate joint portion few excess stock with removing, second direction in fact with the first direction quadrature, and based on the orientation of breach.

Description of drawings

Mode below with reference to accompanying drawing and explanation by way of example illustrates the preferred embodiments of the present invention in further detail, wherein:

Fig. 1 is the simplification cross-sectional view of transfer moIding machine according to a preferred embodiment of the present invention;

Fig. 2 A, 2B and 2C are respectively isometric view, plane and the side views of cast gate joint portion of knock pin of the transfer moIding machine of Fig. 1;

Fig. 3 is the cross-sectional view of taper die cavity of the transfer moIding machine of Fig. 1;

Fig. 4 is the flow chart by the method for the transfer moIding machine excision excess stock of Fig. 1;

Fig. 5 is the side view of transfer moIding machine that has shown Fig. 1 of an excess stock excision member; With

Fig. 6 A, 6B and 6C are respectively front view, side view and the bottom views of excess stock excision member.

The specific embodiment

Transfer moIding machine according to the preferred embodiment of the invention below is described, and the method for when moulded product solidifies, excising excess stock by transfer moIding machine.In the following description, provide details with the explanation preferred embodiment.But those skilled in the art should be known in and can not use these details to realize the present invention.In order not make the present invention too obscure, some details are not elaborated.

The present invention has many advantages.An advantage of the invention is that transfer moIding machine forms excess stock.This excess stock can not be broken into fragment.Therefore, strengthened the excess stock excision, removed the stopping production that the excess stock fragment causes thereby eliminated by the present invention.

Another advantage of the present invention is that transfer moIding machine provides one or more knock pins.Except ejecting excess stock, these knock pins comprise makes the excess stock that forms compare the easier feature of removing ingate and taking out from template from moulded product with existing transfer moIding machine.

Another advantage of the present invention is that transfer moIding machine provides the automatic excision of the excess stock with the cast gate that forms as down gate molding result.Therefore, can eliminate the problem that these excess stocks tangle mutually in the transfer moIding machine.

With reference now to Fig. 1,, Fig. 1 shows the simplification cross-sectional view of transfer moIding machine 10 according to the preferred embodiment of the invention.Transfer moIding machine 10 comprises that one is carried template 12, an intermediate die plate 14 and a complementary template 16.

Need molded product by transfer moIding machine 10 conveying on the discharging direction of arrow 18 indications.For example, these products can be the semiconductor dies (not shown) that for example is placed on the conveyer belt 20.

Carry template 12 to have at least one knock pin, two knock pins 22,24 have been shown among Fig. 1.When ejecting excess stock, knock pin 22,24 is projected into outside the surface 25 of carrying template 12.Utilize one to transmit plunger 28 from model jar 26 injection moulding compound (not shown).Transmitting plunger 28 is advanced to mold compound the excess stock chamber 30 that intermediate die plate 14 forms from model jar 26.

Intermediate die plate 14 also has two conical cavities 32,34.Conical cavity 32,34 is connected to excess stock chamber 30 two die cavities 36,38 of intermediate die plate 14 respectively.

Should be noted that when utilizing mold compound to form a moulded product knock pin 22,24 ejects excess stock from conveying template 12 on the first direction of arrow 40 indications.When the explanation preferred embodiment, knock pin 22 and conical cavity 34 are illustrated associated details as an example with illustrated method.

With reference now to Fig. 2 A to 2C,, knock pin 22 has a cast gate joint portion 50 that comprises a breach 52.Suitably determine the direction of breach 52, so that can 50 remove excess stocks from the cast gate joint portion with the second direction shown in the arrow 54.Second direction in fact with the first direction quadrature.

Breach 52 comprise one as shown in Fig. 2 B, with respect to the first surface 56 of discharging direction (the arrow 18 indicated directions) inclined orientation of transfer moIding machine 10.As shown in Fig. 2 C, first surface 56 is with respect to the longitudinal axis 58 of knock pin 22, with angle 57 inclinations of about 15 to 20 degree.

Breach 52 further comprises an end face 59 and a second surface 60.End face 59 and second surface be parallel to each other and with (shown in the arrow 40) first direction quadrature.

Should be noted that the excess stock that transfer moIding machine 10 forms when solidifying moulded product has cast gate, cast gate has an end (not shown) near the cast gate joint portion 50 of each knock pin 22,24.Each end and cast gate joint portion 50 complementally near, thereby have the breach opposite with breach 52.

The cross-sectional view of Fig. 3 has illustrated the details (not being shown to scale) of conical cavity 34 and die cavity 38.Conical cavity 34 comprises a down gate 70 in the ingate part that is positioned at die cavity 38 72.Ingate part 72 has an ingate degree of depth 74 that is used to the unnecessary mold compound that may remain behind the cast gate.The ingate degree of depth 74 is not more than 0.2mm.Also show ingate dish 76 among the figure in the end of conical cavity 34.Ingate dish 76 has the height that is not more than 0.1mm.

Using transfer moIding machine 10 to excise excess stock when moulded product solidifies is to be undertaken by the method shown in the flow chart of Fig. 4 100.

After step 102 beginning, method 100 enters step 104, separates in step 104 and carries template 12, intermediate die plate 14 and complementary template 16.Separating these

templates

12,14,16 makes the moulded product (not shown) break away from from the down gate of conical cavity 32,34.

Should be noted that in separating step 104 breach 52 has kept an excess stock by the complementation engagement cast gate (not shown) that the curing molding compound from the breach 52 that remains in excess stock chamber 30, conical cavity 32,34 and down gate joint portion 50 forms.Therefore, breach 52 helps to remove excess stock from moulded product.

After this, in step 106, utilize knock pin 22,24 to eject excess stock at first direction (direction shown in the arrow 40).Eject and knock pin 22,24 is projected into carry outside the template 12, thereby breach 52 is exposed on the upper surface 25.When ejecting excess stock, each knock pin 22,24 continues in cast gate joint portion 50 near the cast gate (not shown).

Method 100 finishes in step 108, in step 108, with excess stock in second direction (direction shown in the arrow 54) 50 excisions from the down gate joint portion.Shown in Fig. 2 A and 2B, second direction in fact with first direction (arrow 18 indicated directions) quadrature, and based on the orientation of breach 52.

Excision step 108 comprises utilizes excess stock excision member on second direction excess stock to be pushed open from down gate joint portion 50.In this preferred embodiment, excess stock excision member be one at the motion bar 200 shown in the side view of transfer moIding machine 10.Utilize motion bar 200, excision step 108 comprises the step that motion bar 200 is aimed at the excess stock that will promote.

Fig. 6 A, 6B and 6C show the details of motion bar 200.Motion bar 200 has a plurality of short columns 202 that partly promote excess stock at the running channel that for example connects adjacent gate.This pushing action provides in arrow 54 directions the power of each cast gate from each cast gate joint portion 50 excision.

Although should be known in and understand a preferred embodiment in detail, those skilled in the art can carry out various modifications and improvement, and do not depart from the scope of the present invention.

Claims

1. transfer moIding machine comprises:

At least one template, described template have at least one and are used for the knock pin that on a first direction at least one excess stock ejected from described at least one template, and each described at least one knock pin has a cast gate joint portion,

Wherein said cast gate joint portion comprises a breach, and described breach is suitably directed so that can described at least one excess stock be excised from described cast gate joint portion a second direction, described second direction in fact with described first direction quadrature.

2. transfer moIding machine according to claim 1, wherein said breach comprise a first surface, and described first surface is with respect to the discharging direction inclined orientation of described transfer moIding machine.

3. transfer moIding machine according to claim 2, wherein said breach further comprise a second surface, described second surface and a planar alignment, described plane in fact with described first direction quadrature.

4. transfer moIding machine according to claim 1, wherein said at least one template comprise that is carried a template.

5. transfer moIding machine according to claim 1, wherein said at least one template comprises a complementary template.

6. transfer moIding machine according to claim 1, wherein said transfer moIding machine comprise that further at least one has the intermediate die plate of at least one conical cavity.

7. transfer moIding machine according to claim 6, wherein each described at least one conical cavity has one in the ingate angle of 55 degree to 60 degree scopes.

8. transfer moIding machine according to claim 6, wherein each described at least one conical cavity has an ingate dish.

9. transfer moIding machine according to claim 6, wherein said at least one intermediate die plate comprise that has an ingate part that is used for the ingate degree of depth of excessive mold compound.

10. transfer moIding machine according to claim 1, wherein said transfer moIding machine further comprise the excess stock device for excising that is used to excise described at least one excess stock.

11. transfer moIding machine according to claim 10, wherein said excess stock device for excising comprises a motion bar.

12. transfer moIding machine according to claim 11, wherein said motion bar comprises at least one short column.

13. a method of excising excess stock when moulded product solidifies by a transfer moIding machine, described method comprises step:

Separate a plurality of templates, so that at least one ingate of the one or more templates from described a plurality of templates takes off described moulded product;

The knock pin that utilizes at least one to have the cast gate joint portion that has a breach ejects at least one excess stock that combines with described moulded product on first direction, described at least one knock pin combines with in described a plurality of templates at least one; With

On a second direction from described at least one excess stock of described cast gate joint portion excision, described second direction in fact with described first direction quadrature, and based on the orientation of described breach.

14. method according to claim 13, wherein said excision step is included in the step of on the described second direction described at least one excess stock being pushed open from described cast gate joint portion.

15. method according to claim 14, wherein said excision step further comprise the motion bar of described transfer moIding machine is aimed to carry out the step of described promotion step with described at least one excess stock.