KR102567469B1 - Method for forming by tie bar-type apparatus for forming expanded grain - Google Patents

Abstract

The present invention relates to a method for molding foam granules. In such a foamed lip molding method, (a) the movable mold part 5 is moved forward in the direction of the fixed mold part 3 by the first and second ball screws 26 and 32 of the foamed lip molding apparatus 1. and combining the fixed mold parts 3 and 5 (S100); (b) determining and fixing the position of the booster by matching the grooves of the tie bar and the half nut by moving the booster cylinder assemblies 47 and 41 forward and backward (S105); (C) combining the movable body 20 and the fixed body 22 and closing the half nuts 13 and 15 (S110); (D) a pressure boosting step (S120) of performing a pressure boosting process by pressurizing the moving die 21 with a pressure boosting cylinder; (E) returning the movable die 21 to its original position by moving the booster cylinders 47 and 41 backward (S130); and (F) operating the half nut cylinders 40 and 42 to open the half nuts 47 and 41 (S140).

Description

Method for forming by tie bar-type apparatus for forming expanded grain}

The present invention relates to a foamed lip molding method, and more particularly, by applying a step of moving the moving structure of a mold body forward and backward by a screw and tie bar method, and also by applying a step of forward and backward movement of a booster cylinder assembly to form a tie bar and a half nut. The present invention relates to a method for forming foam granules capable of effectively foam molding foam granules by applying steps of determining and fixing a pressure intensification position by matching grooves and performing a pressure intensification process by pressing a mobile body with a pressure intensification cylinder.

In general, Styrofoam is an expandable polystyrene (EPS) that is heated and cured by adding a foaming agent such as pentane or butane to generate bubbles at the same time.

Styrofoam moldings are not only lightweight, but also have excellent water resistance, heat insulation, sound insulation, and cushioning properties, so they are widely used as packaging cushioning materials, building materials, decorations, and insulation materials.

When manufacturing a styrofoam molding, polystyrene particles impregnated with a foaming agent are preliminarily foamed through heating and aged for a predetermined time. Thereafter, a filling process in which pre-expanded and aged polystyrene particles (hereinafter referred to as "raw resin") are introduced into the mold, a process of heating the mold with steam to form a molded product, and a process of cooling the molded product and mold to separate the molded product from the mold. It goes through the process of discharging the cooled molded product through the separation of the mold.

Molding of such a foamed resin can be performed by a molding device proposed in Patent Registration No. 10-1401390 (name: foamed lip molding device) previously registered by the present patent applicant.

That is, the foamed lip molding device includes a fixed mold unit; a housing disposed at a predetermined distance from the fixed mold unit; a movable mold part movably disposed between the fixed mold part and the housing and coupled to the fixed mold part to proceed with molding of the foamed resin; a link unit that connects the housing and the movable mold unit to push the movable mold unit toward the stationary mold unit when deployed or pull the movable mold unit toward the housing when contracted; And it consists of a crank part that pushes or pulls the link part.

In addition, the movable mold unit has a structure in which four tie bars are disposed through each corner, and the movable mold unit moves forward and backward along the tie bars.

However, in the process of bringing the mobile mold closer to the fixed mold, in order to fill the cavity formed in the mold with raw material beads (expandable resin raw material), a predetermined cracking clearance is secured between them to temporarily stop and fill the raw material. After that, close them closer to fasten the shape.

In addition, it is important for the mobile body to accurately maintain the pressure intensification position during the pressure intensification process between the mobile body and the fixed body.

However, in the pressure boosting process, since the pressing force fluctuates according to variables such as the transport speed and weight of the moving body, the control of the position is unstable, causing an error in the cracking gap to the set value, resulting in non-uniform molding conditions. There is a problem that is difficult to accurately position in .

Patent Registration No. 10-1401390 (Name: foamed resin molding device)

Therefore, the present invention has been made to solve this problem, and an object of the present invention is to apply a step of moving the moving structure of the mold body forward and backward by the screw and tie bar method, and also to the forward and backward movement of the booster cylinder assembly. The step of determining and fixing the pressure intensification position by matching the grooves of the tie bar and the half nut, and the step of performing the pressure intensification process by pressing the mobile body with the pressure intensifier cylinder, thereby effectively foaming and molding the foam lip. It is to provide a molding method.

In order to achieve the above object, one embodiment of the present invention provides a foamed lip molding device, such a foamed lip molding method,

(a) The movable mold part 5 is moved forward in the direction of the fixed mold part 3 by the first and second ball screws 26 and 32 of the foam lip molding device 1, and the movable and fixed mold part 3, 5) combining step (S100);

(b) determining and fixing the position of the booster by matching the grooves of the tie bar and the half nut by moving the booster cylinder assemblies 47 and 41 forward and backward (S105);

(C) combining the movable body 20 and the stationary body 22 and closing the half nuts 13 and 15 (S110);

(D) a pressure boosting step (S120) of pressurizing the movable body 20 with a pressure boosting cylinder to perform a pressure boosting process;

(E) returning the movable body 20 to its original position by moving the booster cylinders 47 and 41 backward (S130); and

(F) operating the half nut cylinders 40 and 42 to open the half nuts 47 and 41 (S140).

As described above, the foamed lip molding method according to an embodiment of the present invention has the following effects.

First, applying a step of moving the mold moving structure forward and backward by a screw and tie bar method, and also determining and fixing the pressure intensification position by matching the grooves of the tie bar and half nut by the forward and backward movement of the booster cylinder assembly; , Foamed granules can be effectively foam-molded by applying a step of pressurizing the movable body with a pressure-increasing cylinder to perform a pressure-increasing process.

Second, by opening and closing the half nut by means of a cylinder, the half nut can be opened or closed more easily.

1 is a flow chart showing a method for molding foam granules according to an embodiment of the present invention.
2 is a perspective view of a foamed lip molding apparatus for performing the foamed lip molding method of FIG. 1;
3 is a plan view of the foamed lip molding apparatus shown in FIG. 2;
4 is a side view in one direction of the foamed lip molding apparatus shown in FIG. 2;
FIG. 5 is a side view of the foamed lip molding apparatus shown in FIG. 2 in the other direction.
6 is a front view of the foamed lip molding apparatus shown in FIG. 2;
7 is a partially enlarged plan view showing an enlarged portion "A" of FIG. 4 .
FIG. 8 is a partially enlarged plan view showing an enlarged portion “B” of FIG. 5 .
FIG. 9 is a partially enlarged view showing a coupling relationship between the booster cylinder, the half nut, and the half nut cylinder shown in FIG. 8 .

Hereinafter, the foamed lip molding method according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 9 , the foamed lip molding method proposed by an embodiment of the present invention proceeds in the following order.

That is, the foamed lip molding method,

(a) The movable mold part 5 is moved forward in the direction of the fixed mold part 3 by the first and second ball screws 26 and 32 of the foam lip molding device 1, and the movable and fixed mold part 3, 5) combining step (S100);

(b) determining and fixing the position of the booster by matching the grooves of the tie bar and the half nut by moving the booster cylinder assemblies 47 and 41 forward and backward (S105);

(C) combining the movable body 20 and the stationary body 22 and closing the half nuts 13 and 15 (S110);

(D) a pressure boosting step (S120) of performing a pressure boosting process by pressurizing the moving die 21 with a pressure boosting cylinder;

(E) returning the movable die 21 to its original position by moving the booster cylinders 47 and 41 backward (S130); and

(F) operating the half nut cylinders 40 and 42 to open the half nuts 47 and 41 (S140).

In this foamed lip molding method,

In the step of combining the movable and fixed molds (S100), the movable mold unit 5 is first moved forward using the tie-bar type foam lip molding apparatus according to an embodiment of the present invention.

That is, as shown in FIGS. 2 to 9 , the tie bar type foam lip molding apparatus 1 includes a fixed mold unit 3 fixed to the front end of a frame 2; A movable mold part 5 movably disposed at the rear end of the frame 2 and separated from the fixed mold part 3 by a certain distance; forward and backward parts 9 and 11 for moving the movable mold part 5 forward and backward in the direction of the fixed mold part 3; A plurality of tie bars (Tie bars; 36, 46) connecting the movable mold part 5 and the fixed mold part 3; a pair of guide members 7 disposed on the frame 2 and stably guiding the movable mold unit 5 in forward and backward directions; half nuts 13 and 15 arranged to surround the tie bars 36 and 46 from above and below and fixed to or released from grooves formed on outer circumferential surfaces of the tie bars 36 and 46; pressure boosting cylinder assemblies (47, 41) movably disposed on tie bars (36, 46) to determine a pressure boosting position by moving half nuts (13, 15) forward and backward, and pressurizing the moving die (21); It includes half nut cylinders 40 and 42 that open and close the half nuts 13 and 15.

In the foamed lip molding apparatus 1 having such a structure, first, a step of combining the movable and fixed mold parts 3 and 5 (S100) is performed.

That is, in a state where the movable mold part 5 is movably disposed on the frame 2, the movable mold part 5 is moved forward by the forward/backward member 9.

The forward and backward members 9 include a first forward and backward member 9 disposed on one side of an upper portion of the moving die 21 and the fixed die 25; It includes a second forward/backward member 11 disposed on the lower side of the movable die 21 and the fixed die 25.

And, the first forward and backward member 9 and the second forward and backward member 11 are disposed in a diagonal direction from each other,

The first forward/backward member 9 includes first and second brackets 28 and 29 protruding from the upper surfaces of the fixed die 25 and the movable die 21, respectively; a first ball screw 26 connecting the first and second brackets 28 and 29 by a screw fastening method; A first motor assembly 24 is connected to the first bracket of the moving die 21 and rotates the first ball screw 26 to move the moving mold part 5 forward and backward in the direction of the fixed mold part 3. .

In addition, the second forward and backward member 11 includes third and fourth brackets 34 and 35 protruding from the lower surfaces of the moving die 21 and the fixed die 25, respectively; a second ball screw 32 connecting the third and fourth brackets 34 and 35 by a screw fastening method; It includes a second motor assembly 30 connected to the third bracket of the moving die 21 and rotating the second ball screw 32 to move the moving mold part 5 forward and backward in the direction of the fixed mold part 3 .

When the first and second forward and backward members 9 and 11 are driven,

As the first and second ball screws 26 and 32 rotate, the movable mold unit 5 primarily advances and stops at the cracking position, and then moves forward secondarily after filling. At this time, the pressure boosting cylinder assemblies 41 and 47 integrally connected to the moving die 21, the half nuts 13 and 15, and the half nut cylinders 40 and 42 also move together.

Therefore, in a pressure boosting process described later, in a state where the half nuts 13 and 15 are fixed to the pressure boosting positions on the tie bars 36 and 46, the pressure boosting cylinder 70 moves forward to pressurize the moving die 21.

At this time, the moving die 21 can be stably advanced by the pair of guide members 7 .

The pair of guide members 7 include brackets 50 provided on both sides of the moving die 21; a slider 52 mounted on the bottom of the bracket 50; It is disposed on the upper surface of the frame 2 in the longitudinal direction, and includes a pair of rails 54 on which the slider 52 is movably seated.

When the step of advancing and combining the movable mold part (S100) is completed, determining and fixing the position of the pressure intensification by matching the grooves of the tie bar and the half nut by moving the pressure intensifying cylinder assemblies (47, 41) forward and backward (S105) is going on

That is, after the movable mold unit 5 moves forward through the first and second steps, a pressure boosting process is performed, in which the pressure boosting cylinder assemblies 41 and 47 integrally connected to the moving die 21 and the half As the nuts 13 and 15 and the half nut cylinders 40 and 42 interlock with each other, the pressure increasing position can be reached and fixed.

These pressure boosting cylinder assemblies 47 and 41 include a pressure boosting cylinder 70 having a cylindrical shape, one side of which is connected to the moving frame 20 and capable of moving forward and backward; It is provided inside the booster cylinder 70 and one side 80 includes a booster piston 48 connected to the half nuts 13 and 15.

At this time, the protruding portion 72 protruding from the outer circumferential surface of the pressure boosting piston 48 movably contacts the inner circumferential surface of the boosting cylinder 70, and the front and rear surfaces of the protruding portion 72 and the inner circumferential jaw portion 74 of the boosting cylinder 70 ) Between the pressure boosting and reverse ports 76 and 78 are formed.

Therefore, when hydraulic pressure is supplied to the pressure boosting forward port 76, the pressure boosting cylinder 70 moves forward in the direction of the moving frame 20, and when hydraulic pressure is supplied to the pressure boosting reverse port 78, the boosting cylinder 70 It moves in the direction of the half nuts 13 and 15.

Through this process, the pressure boosting cylinder 70 and the half nuts 13 and 15 can be moved to the pressure boosting position.

At this time, the half nuts 13 and 15 are simply positioned at predetermined positions on the tie bars 36 and 46 and are not fixed.

That is, since the second screw thread G2 of the half nuts 13 and 15 is not fastened to the first screw thread G1 formed on the circumferential surface of the tie bars 36 and 46, the half nuts 13 and 15 It is in a movable state along the tie bars 36 and 46.

When the step of determining and fixing the pressure increase position (S105) is completed in this way, the step of combining the movable body 20 and the stationary body 22 and closing the half nuts 13 and 15 (S110) proceeds.

That is, by driving the half nut cylinders 40 and 42, the half nuts 13 and 15 may be fixed to the pressure increasing positions on the tie bars 36 and 46.

In more detail,

The half nuts 13 and 15 are connected to one side of the pressure boosting cylinder assemblies 47 and 41 and have a through hole formed in the center of the base 60 through which the tie bars 36 and 46 pass; a pair of guides 62 disposed vertically on both sides of the base 60; Upper and lower blocks 64 and 66 disposed between a pair of guides 62 and spaced apart from each other vertically, and engaging and fixing the threads of the tie bars 36 and 46 when fastened; It protrudes from one side of the upper and lower blocks 64 and 66 and is slidably inserted into the groove 83 of the booster cylinder 70 so that the half nuts 13 and 15 rotate around the tie bars 36 and 43 a guide pin 82 to prevent; The upper and lower blocks 64 and 66 are vertically connected, and the lower block 66 includes a pair of fastening assemblies 65 that can move up and down by the half nut cylinders 40 and 42.

In these half nuts 13 and 15,

The upper block 64 and the lower block 66 have a structure separated from each other, and are stacked up and down and combined.

An upper semicircle h1 is formed in the upper direction on the lower surface of the upper block 64, and a lower semicircle h2 is formed in the lower direction on the upper surface of the lower block 66, so that the upper block 64 and the lower block ( 66) is fastened vertically, the upper semicircle (h1) and the lower semicircle (h2) are combined with each other to form a circle.

Thus, the tie bars 36 and 46 pass through this circle and are inserted into the through holes of the base 60.

In addition, a plurality of second threads G2 are formed on the inner circumferential surfaces of the upper semicircle h1 and the lower semicircle h2, and the second threads G2 are first threads formed on the outer circumferential surfaces of the tie bars 36 and 46 ( It has the same width and pitch as G1).

Therefore, when the upper block 64 and the lower block 66 are coupled to each other, the tie bars 36 and 46 can be fixed by coupling the second screw thread G2 to the first screw thread G1.

And, the rods 43 of the half nut cylinders 40 and 42 are connected to the bottom of the lower block 66.

At this time, the half-nut cylinders 40 and 42 have a cylinder 45, a rod 43 mounted to the cylinder 45 to move forward and backward to elevate and lower the lower block 66, and an upper side of the cylinder 45. It includes a disposed plate 81 and a connection bar 47 protruding from the top of the plate 81 and penetrating the upper and lower blocks 64 and 66 vertically.

Therefore, when the rods 43 of the half nut cylinders 40 and 42 rise, the lower block 66 rises, and at the same time, the connecting bar 47 pulls the upper block 68 downward, thereby lowering the lower block ( The lower semicircle h2 of 66) and the upper semicircle h1 of the upper block 68 come into contact with the outer circumferential surfaces of the tie bars 36 and 46, so that they are fixed at the pressure increasing position.

At this time, the connecting bar 47 moves up and down as the rod 43 moves up and down in a synchronous control screw method.

At the time of release, the half nuts 13 and 15 are released from the tie bars 36 and 46 in an operation opposite to that of the tightening operation.
Meanwhile, a guide pin 82 protrudes from one side of the upper and lower blocks 64 and 66 and is slidably inserted into the groove 83 of the pressure boosting cylinder 70 so that the half nuts 13 and 15 are connected to the tie bar 36 ,43) to prevent rotation.

In this way, after the half nuts 13 and 15 are fixed to the pressure increasing position on the tie bars 36 and 46, the pressure increasing step (S120) of performing the pressure increasing process by pressing the moving die 21 by the pressure increasing cylinder proceeds. .

In the step of increasing the pressure (S120), the foamed resin filled in the cavity formed by the combination of the stationary body 22 and the movable body 20 is heated and molded with steam or the like.

After the pressure boosting process (S120) is completed in this way, a step (S130) of returning the moving die 21 to the original position by moving the pressure boosting cylinders 47 and 41 backward is performed.

That is, when the moving die 21 is moved backward and returned to its original position after the foaming process, the first and second ball screws 26 and 32 are driven by driving the first and second motor assemblies 24 and 30 in opposite directions. also rotate in the reverse direction.

Accordingly, the moving die 21 moves backward by the reverse rotation of the first and second ball screws 26 and 32 and returns to the original position.

Then, the half nuts 13 and 15 are also moved backward and when they reach a predetermined position, the half nuts 13 and 15 are opened (S140).

That is, by operating the half nut cylinders 40 and 42 to lower the cylinder 43, the lower block 66 also descends and is separated from the upper block 64.

Accordingly, the upper block 64 and the lower block 66 are separated vertically so that the first screw thread G1 is disengaged from the second screw thread G2 and becomes an open state.

Then, after the movable die 21 is separated from the fixed die 25, the molded product can be taken out from the mold body.

Claims (7)

(a) The movable mold part 5 is moved forward in the direction of the fixed mold part 3 by the first and second ball screws 26 and 32 of the foam lip molding device 1, and the movable and fixed mold part 3, 5) combining step (S100);
(b) determining and fixing the position of the booster by matching the grooves of the tie bar and the half nut by moving the booster cylinder assemblies 47 and 41 forward and backward (S105);
(C) combining the movable body 20 and the fixed body 22 and closing the half nuts 13 and 15 (S110);
(D) a pressure boosting step (S120) of performing a pressure boosting process by pressurizing the moving die 21 with a pressure boosting cylinder;
(E) returning the movable die 21 to its original position by moving the booster cylinders 47 and 41 backward (S130); and
(F) Opening the half nuts 47 and 41 by operating the half nut cylinders 40 and 42 (S140). According to claim 1,
The foamed lip molding apparatus 1 in step (a),
A fixed mold part 3 fixed to the front end of the frame 2; A movable mold part 5 movably disposed at the rear end of the frame 2 and separated from the fixed mold part 3 by a certain distance; forward and backward parts 9 and 11 for moving the movable mold part 5 forward and backward in the direction of the fixed mold part 3; A plurality of tie bars (Tie bars; 36, 46) connecting the movable mold part 5 and the fixed mold part 3; a pair of guide members 7 disposed on the frame 2 and stably guiding the movable mold unit 5 in forward and backward directions; half nuts 13 and 15 arranged to surround the tie bars 36 and 46 from above and below and fixed to or released from grooves formed on outer circumferential surfaces of the tie bars 36 and 46; pressure boosting cylinder assemblies (47, 41) movably disposed on tie bars (36, 46) to determine a pressure boosting position by moving half nuts (13, 15) forward and backward, and pressurizing the moving die (21); A foam lip molding method comprising half nut cylinders 40 and 42 that open and close half nuts 13 and 15. According to claim 2,
The forward and backward members include a first forward and backward member 9 disposed on one side of an upper portion of the movable die 21 and the fixed die 25; It includes a second forward and backward member 11 disposed on the lower side of the movable die 21 and the fixed die 25,
The first forward and backward member 9 and the second forward and backward member 11 are arranged in a direction diagonal to each other,
The first forward/backward member 9 includes first and second brackets 28 and 29 protruding from the upper surfaces of the fixed die 25 and the movable die 21, respectively; a first ball screw 26 connecting the first and second brackets 28 and 29 by a screw fastening method; A first motor assembly 24 connected to the first bracket of the movable die 21 and rotating the first ball screw 26 to move the movable mold part forward and backward in the direction of the fixed mold part,
The second forward and backward member 11 includes third and fourth brackets 34 and 35 protruding from the lower surfaces of the fixed die 25 and the moving die 21, respectively; a second ball screw 32 connecting the third and fourth brackets 34 and 35 by a screw fastening method; A foam lip molding method comprising a second motor assembly (30) connected to a third bracket of the movable die (21) and rotating the second ball screw (32) to move the movable mold part forward and backward in the direction of the fixed mold part. According to claim 2,
The pair of guide members 7 include brackets 50 provided on both sides of the moving die 21; a slider 52 mounted on the bottom of the bracket 50; A foam lip molding method comprising a pair of rails 54 disposed on the upper surface of the frame 2 in the longitudinal direction and on the upper side of which the slider 52 is movably seated. According to claim 2,
At the rear ends of the tie bars 36 and 46, half nuts 13 and 15 for fixing or releasing the tie bars 36 and 46 to a predetermined position when the tie bars 36 and 46 move forward and backward; A foam lip molding method in which half nut cylinders 40 and 42 are disposed to open and close half nuts 13 and 15. According to claim 5,
The half nuts 13 and 15 are connected to one side of the pressure boosting cylinder assemblies 47 and 41 and have a through hole formed in the center of the base 60 through which the tie bars 36 and 46 pass; a pair of guides 62 disposed vertically on both sides of the base 60; Upper and lower blocks 64 and 66 disposed between a pair of guides 62 and spaced apart from each other vertically, and engaging and fixing the threads of the tie bars 36 and 46 when fastened; It protrudes from one side of the upper and lower blocks 64 and 66 and is slidably inserted into the groove 83 of the booster cylinder 70 so that the half nuts 13 and 15 rotate around the tie bars 36 and 43 a guide pin 82 to prevent; A foam lip molding method comprising a pair of fastening assemblies (65) connecting the upper and lower blocks (64 and 66) vertically and allowing the lower block (66) to move up and down by the half nut cylinders (40 and 42). delete

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