KR101691041B1 - Plastic injection mold apparatus having a hollow bolt - Google Patents

Abstract

The present invention relates to an injection mold device of a plastic bolt having hollow, which can provide high hardness and tensile strength having maximum tensile strength and, more specifically, to an injection mold device of a plastic bolt having hollow, which comprises a fixed portion and a movable portion, wherein the fixed portion is divided into a fixed-side plate and a fixed-side template, and the movable portion includes: a movable-side plate; a space block; an ejector plate; and a movable-side template.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plastic injection molding apparatus having a hollow bolt,

More particularly, a bolt pin advancing by a hydraulic cylinder of a hydraulic unit is provided at the center of a bolt-type cavity at a side of a part line, which is a boundary between a fixed plate and a movable plate, And a bolt-type cavity formed by screwing is injected at the other end of the bolt-type cavity. The molten resin fused to the inside of the bolt-type cavity is injected into the bolt- And an injection mold apparatus for a plastic bolt having a hollow having a light weight without causing corrosion due to the characteristics of a plastic material, together with a tensile strength having a maximum tensile force.

Generally, the screw is composed of a head, a bolt having a male or female portion, and a nut formed with a through hole having both ends penetrated, and a female screw portion formed on an inner circumferential surface of the through hole to engage with the male screw portion. And is widely used in a wide variety of fields as an application for fastening and assembling.

These screws are mainly made of metal because they require high hardness and tensile strength.

However, although the screws of the metal material have high hardness and tensile strength, they are expensive to manufacture because corrosion is easily caused in chemicals such as acid and alkali, and they must be manufactured by machining.

In particular, the drawback of screws made of metal is that corrosion occurs.

Therefore, in order to solve corrosion which is a defect of metallic screws, there has been a polypropylene, polyvinyl chloride, polyethlene and ABS molded in a synthetic resin material, But it is used mainly for toys because it is weak in strength and weak in strength and worn out of threads, and in places where a large force or high fastening force is required such as a fixing member of a panel attached to an outer wall of a building or a water tank having a weight It was impossible to use.

Therefore, in order to solve the problem of corrosion of the metallic material as described above and to increase strength and hardness, recently, a method of manufacturing a bolt by injection molding of plastic has been proposed.

For reference, in the case of plastic injection molding, it is concluded that the process of manufacturing a molded product by injection molding consists of weighing, heating, melting, injection, cooling, and taking out the material.

The basic operation of injection molding in each of these relationships is as follows.

First, at the mold closing stage, the shape cylinder low speed oscillation → high speed oscillation → low speed shape is smoothly performed.

In the second injection stage, nozzle advancement, nozzle touching, screw forwarding, and injection are performed. In the third cooling step, the cooling limit switch is actuated by the injection time, and fourthly, the mold is opened and the mold is opened by slow opening → fast retraction → low speed retraction. Thereafter, at the completion of the injection in the injection step, the material required for the next operation is metered and melt-kneaded, and the operation of cooling is controlled by the limit switch set on the machine.

The period from the start of mold opening to the completion of mold opening and product take-out is generally referred to as an injection molding cycle.

The concept of a molding cycle refers to the pressure, time, and temperature of the material in the mold, which is changed until the molten plasticized material is injected, cooled and solidified in the mold cavity and the product is taken out.

As described above, an example of a manufacturing method for a bolt using a plastic material by an injection molding process is disclosed in Patent Registration No. 10-0797910. The technical feature is that a head portion formed with a washer and a thread The bolt core material being prepared in such a manner that the head portion of the bolt core material is inserted, and the head portion and the washer are formed at the lower end of the head portion of the outer forming body, And a secondary molding step in which the primary insert-molded bolts are subjected to secondary insert molding so as to insert the shaft portions of the bolt core material.

Such a plastic bolt is formed by inserting a bolt core into the plastic bolt, and has an effect of providing excellent rigidity, merchantability, and the like.

However, in order to enhance the rigidity of the plastic bolt, it is necessary to first process the inner core of the bolt core. In addition, a primary insert molding step outside the head part and the washer, and a secondary insert molding step The manufacturing process of the plastic bolt is complicated and the efficiency in mass production is inferior.

In addition, the bolt is manufactured from a metal material through a multi-impact process (multi-impact process), and is manufactured hollow in the center of the bolt. As disclosed in Patent Registration No. 10-0972224, And a multi-impact process in which a conical upper punch is provided in the middle of the head forming groove and a lower material pouring hole is formed in the lower mold.

When the upper and lower molds are provided, the material is introduced into the material injection hole. When the upper mold is closed, the lower punch is raised. When the upper punch is lowered to perform the punching operation, The bolt semi-finished product having the hollow portion in the middle of the material is completed when the lower punch is in contact with the upper punch of the upper mold and communicates with the upper punch of the lower mold, After the upper mold is opened, the bolt semi-finished product is taken out, and finally the male thread is rolled by using a rolling machine or the like on the outer edge portion of the bolt, thereby completing the finished bolt product.

However, as described above, when the material is inserted into the lower mold and the upper punch is closed with the upper mold, the bolts are formed into semi-finished products by the punching operation by raising and lowering the low punch and the upper punch, In addition, since the low punch and the upper punch are formed by punching operation at a time instead of molding the semi-finished product of the bolt, the production efficiency is improved in mass production There is a problem that falls significantly.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a bolt pin which is advanced by a cylinder of an oil pressure unit at a side portion of a party line, which is a boundary between a stationary- The molten resin fused to the inside of the bolt-type cavity formed by the nut and the washer at the head is formed at one end of the bolt-type cavity and the screw is formed at the other end of the bolt-type cavity, So as to provide a tensile strength having a high hardness and a maximum tensile strength.

It is a further object of the present invention to provide a bolt made of a plastic material which is basically shielded from corrosion when a bolt made of a plastic material is applied to a panel of a building, a road, a bridge, a soundproof wall, a rail, Semi-permanently available.

According to an aspect of the present invention, there is provided a stationary plate and a stationary-side plate, wherein the stationary plate and the stationary-side plate are divided into a stationary portion and a stationary portion, and the movable portion includes a movable plate, a space block, And a right cavity piece having a gate and a bolt-shaped cavity in the longitudinal direction formed by half-grooves is provided on a plane of the fixed-side template, and a planar surface of the movable-side template corresponding to the fixed-side template is provided with a runner and a gate, Shaped cavity is provided with a left cavity part formed with a semi-circular groove, and a fixing member having a guide hole for guiding the bolt pin when the bolt pin is inserted into and removed from the center of the bolt-type cavity, A core including a clip member having a head part assembled therein, A plastic injection mold apparatus including a hydraulic unit, wherein a tip of the clip member includes a pin assembly groove for assembling a head of the bolt pin,
A bolt head having a predetermined size is formed at one end of the bolt-type cavity provided in the right cavity piece, and a bolt head is formed at the other end, and a right housing and a clip member housing adjacent to the bolt head;
A bolt head having a predetermined size is formed at one end of the bolt-type cavity provided on the left cavity piece, and a bolt head is formed at the other end, and a left housing and a left slide groove are provided adjacent to the bolt head;
Wherein the oil pressure unit has guide grooves having guide grooves for guiding the guide protrusions on both sides of the clip member from both sides;
A blocking block for braking the clip member at one end of the guide base;
One end of the arm passing through the blocking block is connected to a T-shaped protrusion corresponding to a T-shaped hole provided in the clip member, and a hydraulic cylinder is coupled to the other end.

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As described above, according to the present invention, the bolt pin advancing by the cylinder of the hydraulic unit is located at the center of the bolt-type cavity on the side of the part line which is the boundary between the stationary-side plate and the movable-side plate, and at one end of the bolt- And a molten resin fused to the inside of the bolt-type cavity formed at the other end of the screw is solidified and solidified at the center of the plastic bolt to have a tensile strength having high hardness and maximum tensile force, When the bolts are applied to the exterior wall panels or the facilities used for roads, bridges, soundproof walls, railings, streetlights, etc., it is essential to prevent corrosion, so there is no need to replace the facilities and it can be used semi-permanently.

1 is a side sectional view of a plastic injection mold apparatus of the present invention.
2 is an exploded perspective view of the stationary side mold, the movable side mold, and the hydraulic unit according to the present invention.
3 is a front view of the plastic injection mold apparatus of the present invention
4 is a perspective view of a molded product of a plastic bolt by the plastic injection mold apparatus of the present invention.
FIG. 5A is a side view of the movable-side template in the state where the movable-side template is separated from the fixed-side template.
5B to 5C are a side view and a perspective view, respectively, of a state in which the bolt pins are waiting on the fixing member by the hydraulic cylinder applied to the present invention.
FIG. 6A is a side view of the movable-side template applied to the present invention in contact with the fixed-side template. FIG.
6B to 6C are a side view and a perspective view, respectively, of a state in which the bolt pin is moved to the left opening piece by the hydraulic cylinder applied to the present invention,
Fig. 7 is a side view of the state in which the molded article is attached to the movable side mold plate while the movable side mold plate and the fixed side mold plate are separated from each other.
8 is a side view of a state in which a molded article is taken out by an eject pin of an eject plate applied to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, the plastic injection mold apparatus 100 can be roughly divided into a fixing unit 200, a movable unit 300, a core 400, and a hydraulic unit 500.

The movable part 300 is divided into a movable side plate 310, a space block 320 and an ejection plate 330. The fixed side plate 210 is fixed to the fixed part 200, And a movable side mold plate 340. The movable side mold plate 340 and the movable side mold plate 340 are provided.

The fixed side plate 210 and the fixed side mold plate 220 are fastened with a fastening bolt V1 and the right cavity piece 230 provided on the plane of the fixed side mold plate 220 is provided with a runner R1 and a gate G1 And a bolt-type cavity C1 is formed in the longitudinal direction, a screw-thread portion 231 having a predetermined size is formed at one end of the bolt-type cavity C1, and a bolt head 232 And the right housing 233 and the clip member housing 234 are formed adjacent to the bolt head 232.

Here, at the entrance of the runner (R1), a sprue (S) through which molten resin is injected by the fixed side plate (210) and the fixed side mold plate (220) is connected.

Further, the guide bushing 240 having the guide hole 241 is embedded in the upper side of the fixed side mold plate 230 so as to be partitioned into four places in each direction, but it is possible to install only two places on the upper side.

The movable plate 310 is coupled to the space block 320 and the movable plate 340 by fastening bolts V2. The movable plate 310 is moved in the left and right directions by a mold opening / closing device (not shown) It is possible to slide rightward and backward.

A runner R2, a gate G2 and a bolt-shaped cavity C2 are formed in a semicircle groove on the plane of the left cavity piece 350. A screw portion 351 is formed at one end of the bolt- And a bolt head 352 is formed at the other end of the bolt head 352. The bolt head 352 is formed adjacent to the left housing 353 and the left slide groove 354.

Further, a guide bar 360 slidable by the guide bushing 240 is divided into four places on the upper side of the movable side template 340, but it is possible to install only two places on the upper side.

The ejection plate 330 is provided with a plurality of ejection pins 331 for allowing the molded product attached from the left cavity piece 350 to be taken out.

The core 400 is partitioned by a fixing member 410 and a clip member 420. The fixing member 410 is formed by drilling a guide hole 411 for guiding the bolt pin P into the right housing 233 and the left housing 353, respectively. The clip member 420 is provided with a pin assembly groove 421 in which the head portion H of the bolt pin P is assembled and a protrusion on the upper side of the clip member 420 is seated on the clip member housing 234, The body of the clip member 420 is configured to be seated in the left slide groove 354.

Here, the pin assembly groove 421 is perforated in the longitudinal direction as shown in the drawing, but it may be drilled only to the depth where the head portion H is fitted according to design conditions.

The oil pressure unit 500 is divided into a guide support piece 510, a blocking block 520, an arm 530 and a hydraulic cylinder 540, The guide groove 511 guides the guide protrusions 422 on both sides of the clip member 420 and the stop block 520 is provided with a large width of the clip member 420 to prevent the clip member 420 from being separated And the T-shaped protrusion 531 provided at one end of the arm 530 is assembled to the T-shaped hole 423 of the clip member 420 and the other end is coupled with the hydraulic cylinder 540 .

It is preferable that the T-shaped protrusions 531 are assembled with each other in the T-shaped hole 423 so that the clip member 420 and the arm 530 are fastened to each other. That is, a circular groove corresponding to the circular projection. .

4, the plastic bolt 600 formed by the plastic injection mold apparatus 100 has a nut 611 and a washer 612 located at the head 610 and a plastic bolt 600 A hollow portion 621 is formed in the shaft portion 620 and a screw 622 is formed in the lower end of the shaft portion 620.

Here, the plastic bolt 600 is preferably made of resin fused in a ratio of 70% of nylon and 30% of glass fiber, and it is preferable that the plastic bolt 600 has high tensile strength, bending rigidity, excellent heat distortion temperature, excellent abrasion resistance, Light weight and oxidation are not generated.

Particularly, since the hollow portion 621 is provided at the center of the plastic bolt 600, the breaking strength can be increased.

In addition, the resin fused at a ratio of 70% of nylon and 30% of glass fiber is set to 240 kg / cm 2 or more, which is the test standard value of breaking strength of hollow plastic bolts, and the displacement is 9 mm or less. The weight of the plastic bolt to be tested is 13g, the length is L = 218mm, and the diameter of the hole is limited to ø1,84, and the value can be obtained as shown in the table below.

division One 2 3 4 5 6 7 8 9 Average Maximum load (KGF) 268.5 271.8 271 294.6 281.5 253.2 273.3 267.2 275.8 273 Maximum displacement (mm) 8.7 9.45 7.15 7.89 8.93 7.67 7.78 7.58 7.89 8

As shown in the above table, when the load of 240 kg / cm 2 or more, which is the criterion of the breaking strength, is applied, the average value of the displacement is 8, indicating that the bending state is good.

The injection mold apparatus and the apparatus of the hollow plastic having the above-described structure of the present invention are as follows.

5A to 5C, the plastic injection mold apparatus 100 is waiting in the mold before the molten resin is injected from a cylinder (not shown).

That is, the movable plate 310, the space block 320, the eject plate 330, and the movable plate 340 of the movable unit 300 are moved from the fixed plate 220 of the fixed unit 200 Be in a state of being separated

At this time, the end of the guide rod 360 provided with the movable-side mold plate 340 is partially in the guide hole 241 of the guide bushing 240 of the fixed-side mold plate 220.

In the state in which the movable side mold plate 340 is in a state of being spaced apart from the fixed side mold plate 220 as described above, the movable side mold plate 340 is fixed by the mold- And moves the arm 530 forward by the hydraulic cylinder 540 of the hydraulic unit 500 so that the bolt pin P can enter the bolt type cavities C1 and C2.

6A to 6C, when the movable side mold plate 340 is in contact with the party line PL of the fixed side mold plate 220 by the mold closing device, the left cavity piece 350 The protruding portion of the clip member 420 in the right cavity piece 230 is accommodated in the clip member housing 234 provided in the right cavity piece 230 and the fixing member 410 is inserted into the right housing piece 233 of the right cavity piece 230 The guide protrusions 422 on both sides of the clip member 420 connected to the arm 530 at the same time as the arm 530 advances by the hydraulic cylinder 540 of the hydraulic unit 500 are guided by the guide support pieces 510 ) Along the guide grooves 511 on both sides.

The bolt pin P assembled to the clip member 420 advances along the guide hole 411 of the fixing member 410 so that the tip of the bolt pin P is inserted into the screw thread portion 231 located at the end of the bolt type cavities C1, ) ≪ / RTI >

When the movable side mold plate 340 is brought into contact with the party line PL of the fixed side mold plate 220 as described above, the plastic injection mold apparatus 100 is closed and the molten resin in the cylinder is injected into the plastic injection mold apparatus The molten resin is injected into the gap between the runners R1 and R2 of the left and right cavity pieces 350 and 230 and the gates G1 and G2 and the bolt- (C2), and then flows at a predetermined time to complete the solidified molded product.

When the molded product is completed as described above, the movable plate 310, the space block 320, the eject plate 330, and the movable side mold plate 340 are fixed to the fixed side And is spaced apart from the template 220. At this time, the solidified molded article is attached to the left cavity piece 350 of the movable side template 340.

Therefore, at this time, the ejection plate 330 moves and the molded article is taken out by the plurality of ejection pins 331.

As described above, the movable mold template 340 is brought into contact with the part-line PL of the fixed mold plate 220 by the mold closing apparatus to close the injection mold apparatus 100 of plastic, A series of steps of picking up the molded and finished product in a state where the ends of the bolt pins P are located at the screw thread portions 231 and 351 and the molten resin is transferred to the left and right cavity pieces 350 and 230 Is referred to as an injection molding cycle.

The plastic bolt 600 of the molded product taken out by the injection molding cycle of the plastic injection mold apparatus 100 has the nut 611 and the washer 612 located at the head 610 and the plastic bolt 600, A hollow portion 621 is formed in the shaft portion 620 of the shaft portion 620 and a screw 622 is formed in the lower end portion of the shaft portion 620. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not limited thereto. Various modifications may be made by those skilled in the art. Are included in the scope of the present invention.

100: plastic injection mold apparatus 200:
210: fixed side plate 220: fixed side template
230: right cavity part 231: screw part
232: bolt head portion 233: right housing
The present invention relates to a clip member housing, a clip member housing, a movable member, a movable plate, a space block, an ejection plate, a movable plate,
352: bolt head portion 353: left housing
The present invention relates to a slide fastener comprising: a left slide groove; a left slide groove; a core; a fixing member; a guide hole;
500: hydraulic unit 510: guide bearing piece 511: guide groove 520: blocking block 530: arm 531: T-shaped projection
540: Hydraulic cylinder R1, R2: Runner
G1, G2: Gate C1, C2: Bolt-type cavity
PL: Party line P: Bolt pin
H: head 600: plastic bolt
610: head 611: nut 612: washer 620: shaft 621: hollow 622: screw

Claims (6)

A space block, an ejection plate, and a movable side mold plate are provided on the movable portion, and the fixed side plate and the movable side mold plate are provided on the plane of the fixed side mold plate, And a right cavity piece having a gate and a longitudinal bolt-type cavity formed by a semicircular groove, wherein a runner and a gate, and a bold cavity in the longitudinal direction are formed in a plane of the movable side template corresponding to the fixed side template, A fixing member having a guide hole for guiding a bolt pin in and out of the center of the bolt-type cavity, and a clip member assembled with the head of the bolt pin, And a hydraulic unit for reciprocating the clip member, wherein the clip member In the tip of the plastic injection mold unit including a pin assembly groove so that it can be added the head of the bolt pin assembly,
A bolt head having a predetermined size is formed at one end of the bolt-type cavity provided in the right cavity piece, and a bolt head is formed at the other end, and a right housing and a clip member housing adjacent to the bolt head;
A bolt head having a predetermined size is formed at one end of the bolt-type cavity provided on the left cavity piece, and a bolt head is formed at the other end, and a left housing and a left slide groove are provided adjacent to the bolt head;
Wherein the oil pressure unit has guide grooves having guide grooves for guiding the guide protrusions on both sides of the clip member from both sides;
A blocking block for braking the clip member at one end of the guide base;
Wherein one end of the arm passing through the blocking block is connected to a T-shaped protrusion corresponding to a T-shaped hole provided in the clip member, and a hydraulic cylinder is coupled to the other end.

















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