KR20070117324A - A inspection equipment for a injection mold and a coupling device of the inspection equipment and the mold - Google Patents

Abstract

A testing device for an injection mold and a coupling device for linking the testing device to the injection mold are provided to shut off injection of melted molding material automatically when a predetermined amount of the material has been filled in the cavity by a control unit pushing forward a gate valve to close off a gate to stop the injection of the molding material. A testing device for an injection mold has a molding material storing tank equipped with a molding material storing chamber(20) and a heating device for melting the molding material. A cylinder(18) has a back end communicated with the tank, and a front end connected to a gate(32) linked to a nozzle touch(8). A piston(29) inside the cylinder is moved freely back and forth by the fluid pressure. A gate valve(35) is installed on an inner side of the piston. The gate valve has a molding material passage(36) communicated with the molding material storing chamber, and has a valve pin(37) at a front end for opening and closing the gate. A control unit controls the conversion of the fluid pressure inside the cylinder. A coupling device for linking the testing device to the mold has a screw shaft. A screw nut is coupled to the screw shaft and moved left or right. A guide bolt is installed projecting to the screw nut. The front end of the guide bolt is inserted into an elongated hole having the same diameter as a rotary ring. Cam grooves have a spiral shape of a predetermined length and are installed on the circumference of the rotary ring. A base ring is installed below the rotary ring. Movable wheels have projecting guide pins. The guide pins are inserted into the cam grooves. As the rotary ring is rotated, the movable wheels are moved towards the center of the rotary ring, strongly tightening the coupling device linked to the mold.

Description

Inspection device of injection molding mold and connecting device of the inspection machine and mold {A INSPECTION EQUIPMENT FOR A INJECTION MOLD AND A COUPLING DEVICE OF THE INSPECTION EQUIPMENT AND THE MOLD}

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal side view of the state which set the tester in the injection molding metal mold which shows 1st Example of this invention.

2 is a longitudinal side view at the time of opening the gate valve according to the first embodiment;

3 is a longitudinal side view at the time of closing the gate valve according to the first embodiment;

4A to 4C show the inspection device of the injection molding die of the present invention and a connecting device of the mold, FIG. 4A is a plan view, FIG. 4B is a front view showing a partial cross section, and FIG. 4C is a side view showing a partial cross section.

<Explanation of symbols for the main parts of the drawings>

1: injection molding mold 2: mold body

6: cavity 7 sprue

8: nozzle touch 15: checker body

16: tank 18: cylinder

19: molding material 20: molding material storage chamber

29 piston 32 gate

35 gate valve 36 molding material passage

37: valve pin 40 controller

50: connector 51: base ring

52: rotation ring 53: insertion hole

54: cam groove 55: long hole

56: rotating mechanism 57 screw shaft

58: handle 59: screw nut

63: guide bolt 70: moving wheels

71: guide pin.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tester for an injection molding mold for inspecting an injection molding mold by manufacturing a injection molding die, and then filling the cavity and sprue with a molding material, and a connector for coupling the tester and the injection molding mold.

In the injection molding die for molding the resin molded article, one or a plurality of cavities are provided between the stationary die and the movable die. In the resin molding using the injection molding machine, the molten resin injected from the nozzle of the injection molding machine is filled into the cavity of the mold through the sprue from the nozzle touch of the fixed mold to be molded into a predetermined shape, and then the molten resin is cooled and solidified. After this, the fixed mold and the movable mold are separated to take out the molded product from the cavity.

Therefore, the shape of the molded article and the precision of the surface layer surface are determined by the shape and the surface precision of the inner circumferential surface of the cavity, and when there is a flaw in the cavity of the injection-molded die, the scratch appears as it is on the surface of the molded article. For this reason, after the injection molding die is produced, before the mold is shipped, the molding material in a heat-melted state (usually a melting point of 100 ° C to 120 ° C) is heated to the cavity through the sprue from the nozzle touch as an inspection step of the injection molding die. A dummy molded article is molded by filling a paraffin-based molding material). After the dummy molded article is cooled and solidified, the molded article is taken out of the cavity and the dummy molded article is visually inspected by a microscope or a microscope to inspect the finished state of the injection molding die, particularly the cavity.

That is, when the dummy molded product is inspected and the cavity is found to be defective, the mold is disassembled to replace the part or the defective part is repaired, and the cavity is again filled with a molding material in a hot melt state to form the dummy molded product. By repeating the mold inspection, finally, a mold having a cavity having a predetermined precision is performed.

The inspection machine of the conventional injection molding die generally has a molding material accommodating chamber which accommodates a molding material in the tester main body, and is equipped with the tank provided with the heat generating body which heat-melts this molding material. The tank is provided with a piston for extruding the molding material therein, and has a molding material injection port connected to the sprue of the injection molding die at its tip.

The inspector main body is set in the injection molding mold to be inspected to connect the molding material inlet to the nozzle touch of the mold. In this state, the piston of the tank is operated to inject the molding material in the hot melt state into the cavity of the injection molding die through the nozzle touch. Then, when the cavity of the mold and the sprue are filled with the molding material in the hot melt state, the operation of pressing the piston of the tank is stopped and the ball bearing is pressed with a spring on the sprue tip to close the sprue so that the molding material is sealed in the mold. I was letting go.

However, the sealing of the molding material into the mold by pressing the ball bearing with a spring causes the fatigue of the spring or the presence of some foreign matter in the molding material, resulting in insufficient sprue closure by the ball bearing, which causes the molding material to enter the mold. Since it is not sealed enough, the problem that the molding material leaks out from the inlet of a sprue and flows out may arise. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when a molding material in a molten state is injected into a cavity and a certain amount of molding material is filled into the mold, the inflow of the molding material can be automatically stopped to prevent the molding material from leaking. An object of the present invention is to provide a tester for an injection molding die, and a connector for the tester and the mold.

The present invention is to provide a dummy molded article in the inspection machine of the injection molding mold for filling the molding material in the molten state into a cavity of the injection molding mold provided with a cavity between the fixed mold and the movable mold to form a dummy molded article to inspect the injection molded mold. A molding material tank having a material accommodating chamber for accommodating the molding material to be formed, and having a heating element for heating and melting the molding material in the material accommodating chamber, and communicating with a material accommodating chamber of the molding material tank at a proximal end thereof; A cylinder connected to the gate connected to the nozzle touch of the injection molding die at the distal end, a piston freely moving forward and backward by the fluid pressure in the cylinder, and integral with the piston inside the piston to move forward and backward in the cylinder Molding material which runs freely and communicates with the material storage chamber inside A gate valve having a discharge passage, a valve valve having a valve pin for opening and closing the gate at a distal end thereof, and a controller for performing fluid pressure switching control in the cylinder, and retracting the gate valve by the control of the controller. To open the gate so that the molding material of the material accommodating chamber enters the cavity through the gate and, after the molding material is introduced, closes the gate by advancing the gate valve to prevent the molding material from entering the cavity. An inspection machine for an injection molding die is provided. (Claim 1)

The controller also provides a tester for the injection molding die according to claim 1, which executes a control for switching the fluid pressure in the cylinder by a timer and opens and closes the gate valve by advancing and retracting the piston. (Claim 2)

The gate of the cylinder is provided in contact with the nozzle touch of the injection molding die, and the gate valve is a valve pin for opening and closing the gate lumen. (Claim 3)

Moreover, it is a connector which connects a tester and a metal mold | die of the injection molding die of Claim 1, The screw shaft, The screw nut which moves to the left-right in line with the said screw shaft, It protrudes in the screw nut, The tip is a rotating ring A guide bolt inserted into an elongated hole provided in a radial length thereof, a rotation ring rotating in the circumferential direction by moving the guide bolt left and right, and formed in a spiral length on the circumference of the rotation ring in a predetermined length. A cam groove, a base ring mounted below the rotary ring and provided with a movable wheel insertion hole in a position corresponding to the cam groove of the rotary ring, and protruding a guide pin on the surface and inserting the guide pin into the cam groove of the rotary ring. And the rotating wheel in the hole through which the moving wheel is inserted by the cam mechanism by rotating the rotating ring. Moves in a direction to provide an injection mold of the tester and the connector of the molding die so as to firmly tighten the connector provided in the mold at the front end of the moving wheel (claim 4)

Example

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

FIG. 1: is a longitudinal side view of the state which set the tester 11 in the injection molding die 1. As shown in FIG. The mold main body 2 of the injection molding die 1 is composed of the stationary die 3 and the movable die 4. A plurality of cavities, two cavities 6 and 6 in this embodiment, are provided on the divided surface 5 of the stationary die 3 and the movable die 4.

The cavity 6 communicates with the nozzle touch 8 via the sprue 7 provided in the fixed mold 3. In the nozzle touch 8, molten resin is injected from an injection molding machine (not shown). In addition, the code | symbol 9 is an extrusion pin which advancing and retreats relatively in the axial direction by the extrusion plate 10, and can shape | mold a molded article from the cavity 6.

The inspection machine 11 is mounted on the mold main body 2. The tester 11 will be described with a base 12 fixed to the mold main body 2. The base 12 is provided with the guide cylinder 13 in a perpendicular direction, and the support shaft 14 is supported by this guide cylinder 13 so that a vertical movement is possible. The tester main body 15 is provided in this support shaft 14.

The inspection body main body 15 is provided with a cylindrical tank 16. The upper part of this tank 16 is closed by the lid 17, and the lower part is connected to the cylinder 18 mentioned later. Inside the tank 16, there is formed a molding material accommodating chamber 20 that accommodates a molding material (hereinafter referred to simply as a molding material) 19 of a dummy molded body mainly composed of paraffin.

The molding material accommodating chamber 20 is partitioned into an upper chamber 20a and a lower chamber 20b by a partition panel 21, and the partition panel 21 penetrates through a lid 17 to protrude outward. The handle 23 is installed through the rod 22. The molding material 19 is heated and melted by a heating element such as a heater (not shown) provided in the tank 16 and accommodated in the lower chamber 20b of the molding material accommodation chamber 20.

The cylinder 18 is fixed to the lower end of the tank 16 by a connecting member 24. The cylinder 18 is cylindrical, and as shown in FIG. 2, the base end is closed by the base end plate 25, and the tip end is closed by the end end plate 26. As shown in FIG. Therefore, the cylinder chamber 27 partitioned by the base end plate 25 and the front end plate 26 is formed in the cylinder 18. As shown in FIG. In this cylinder chamber 27, the piston 29 provided with the O-ring 28 is provided freely to advance (up and down).

The through hole 30 is provided in the center of the base end plate 25, and the cylindrical guide part 31 coaxially with the through hole 30 is installed in the center of the front end plate 26, and is integrally protruded. have. The tip end of the guide part 31 forms a tapered shape, and the tip end part is provided with the gate 32 connected in surface contact with the nozzle touch 8 of the mold main body 2.

Moreover, the said piston 29 is comprised by combining two disks 33 by the bolt 34, The pipe-shaped gate valve 35 which protrudes in the up-down direction is provided in this piston 29. It is. This gate valve 35 is provided with the passage 36 of the molding material penetrating in the axial direction. The proximal end of the gate valve 35 is freely inserted into the through hole 30 of the proximal closure plate 25 in the axial direction, and the proximal end is freely inserted into the guide 31 of the distal end plate 26 in the axial direction. do.

The proximal end of the molding material passage 36 provided in the gate valve 35 communicates with the molding material accommodation chamber 20, and a valve pin 37 is provided at the distal end to open and close the lumen of the gate 32. The O-rings 38 and 39 are sealed between the gate valve 35 and the through hole 30 and between the guide portion 31, respectively. In addition, the cylinder chamber 27 is partitioned into the upper chamber 27a and the lower chamber 27b by the piston 29 (refer FIG. 2 and FIG. 3).

On the other hand, as shown in FIG. 1 separately from the tester main body 15, the controller 40 which controls the tester main body 15 is provided. The controller 40 has a built-in fluid, for example an air source, not shown. The air supply source communicates with the molding material accommodating chamber 20 through the first air inlet 42 provided in the lid 17 via the air supply passage 41 for molding material injection.

Moreover, the air supply source communicates with the upper chamber 27a via the 2nd air inlet 44 provided in the cylinder 18 through the air supply line 43 for closing the gate valve, and also supplies the air supply for opening the gate valve. It communicates with the lower chamber 27b via the 3rd air inlet 46 provided in the cylinder 18 via the pipeline 45.

The controller 40 has a built-in solenoid valve and a timer, and the solenoid valve is switched so that the lower chamber (through the third air inlet 46 of the cylinder 18) from the air supply line 45 for opening the gate valve. When air is supplied to 27b), the piston 29 in the cylinder chamber 27 raises and the gate valve 35 (refer FIG. 2) is opened.

In addition, when the set time has elapsed after the solenoid valve is opened, the solenoid valve is switched by the signal of the timer, and the gate valve closing air supply line 43 passes through the second air inlet 44 of the cylinder 18. When air is supplied to the upper chamber 27a, the piston 29 in the cylinder chamber 27 descends and the gate valve 35 is closed. Here, the setting time of the timer is set according to the volumes of the cavity 6 and the sprue 7 of the mold, and when the cavity 6 and the sprue 7 are filled with a predetermined amount of molding material 19, the timer The solenoid valve operates by the signal of the gate valve 35, and the gate valve 35 is closed.

4A to 4C are views showing the connector 50 for connecting the inspector 11 to the injection molding die, FIG. 4A is a plan view of the connector 50, FIG. 4B is a front view showing a partial cross section, and FIG. 4C is a part It is a side view which shows a cross section. In Fig. 4A, reference numeral 51 denotes a base ring, and the base ring 51 is formed with a circular recess inside thereof. In addition, an insertion hole 53 for inserting the moving wheel 70 radially toward the center of the ring at three locations at predetermined intervals is provided at the ring peripheral edge. The moving wheel 70 is inserted into the insertion hole 53 of the base ring 51 to move freely in the direction of the center of the base ring 51, and is fixed to the surface so that the guide pin 71 protrudes. The rotary ring 52 is fitted to the circular recess inside the base ring 51. The rotary ring 52 is provided with three spiral cam grooves 54 of predetermined length on the circumference of the upper surface thereof at equal intervals.

The rotating ring is inserted into the circular recess inside the base ring 51, the moving wheel 70 is inserted into the insertion hole 53 of the base ring 51, and the moving wheel 70 is provided to protrude. The guide pin 71 is inserted into the cam groove 54 provided in the rotation ring 52. In addition, a radially long hole 55 is formed in the rotary ring 52 between the cam grooves 54.

The rotary ring 52 is rotated in the forward and reverse rotation direction by the rotation mechanism 56. That is, the rotation mechanism 56 slides the screw nut 59 screwed to the screw shaft 57 by rotating the screw shaft 57 supported by the bearings 60, 61. Along with the screw axis 57 to move from side to side. Moreover, the guide bolt 63 is fixed to the screw nut 59 so that it may protrude, and the front end is matched with the elongate hole 55 provided in the radial length of the rotating ring 52 mentioned above. Therefore, when the handle 58 of the rotation mechanism 56 is rotated, the screw nut 59 screwed to the screw shaft 57 moves left and right along the screw shaft 57, whereby the screw nut ( Guide bolts 63 fixed to 59 cause the rotary ring 52 to rotate in the rotational direction. When the rotary ring 52 rotates, the guide pin 71 provided to protrude into the moving wheel 70 inserted into the insertion hole 53 of the base ring 51 is moved into the cam groove 54 of the rotary ring 52. It is guided and moves forward and backward with respect to the center of the base ring 51.

Next, the inspection operation | movement of the injection molding die comprised as mentioned above is demonstrated. When the injection molding die is produced and inspected before shipping it, as shown in FIG. 1, the inspection body main body 15 is mounted on the mold main body 2. In that case, the gate 32 of the inspector main body 15 is coupled to the nozzle touch 8 of the mold main body 2, which is then connected using a connecting device (FIGS. 4A-4C) mounted between the mold and the inspector. Do as follows.

First, when the handle 58 of the rotation mechanism 56 is turned to the left direction, the screw shaft 57 rotates and the screw nut 59 moves to the right direction. As a result, the guide bolt 63 fixed to the screw nut and protruding from the long hole 55 of the rotary ring 52 rotates the rotary ring 52 in the direction opposite to the arrow A. When the rotation ring 52 rotates in the opposite direction to the arrow A, the guide pin 71 protruding from the cam groove 54 of the rotation ring 52 moves in the circumferential direction along the cam groove 54. When the guide pin 71 moves in the outer circumferential direction along the cam groove 54, all the moving wheels 70 fixed to the guide pin 71 move in the outer circumferential direction of the base ring 51 and are surrounded by them. This results in an enlarged inner diameter. In this state, the moving wheel 70 is positioned so that the connector 50 of the upper surface of the mold main body 2 is located between the moving wheels 70.

Next, when the handle 58 is turned in the opposite direction to the above, the screw shaft 57 also rotates in the opposite direction so that the screw nut 59 similarly moves in the opposite direction, and the guide bolt 63 moves the rotary ring 52. Rotate in the direction of arrow A. As a result, the guide pin 71 protruding from the cam groove 54 of the rotary ring 52 moves in the inner circumferential direction along the cam groove 54. Then, the moving wheels 70 fixed to the guide pins 71 move toward the center of the base ring 51 to firmly tighten and fix the connector 50 on the upper surface of the mold body 2 so that the mold body and the inspector body are coupled. It becomes the state that became.

Next, the process of inject | pouring a molding material into a metal mold | die is demonstrated. A predetermined amount of molding material 19 is previously contained in the molding material accommodating chamber 20 of the tank 16 of the inspector main body 15, and the molding material 19 is maintained in a hot melt state by a heating element. In addition, the set time (time for injecting the molding material 19 in accordance with the volume of the cavity 6 and the sprue 7 of the mold main body 2) is set by the timer of the controller 40.

When air is supplied from the air supply source of the controller 40 in this state, the air is supplied from the first air inlet 42 to the upper chamber 20a of the molding material accommodating chamber 20 through the air supply pipe 41 for molding material injection. Is supplied. Thus, the partition plate 21 is pushed down by the air so that the molding material 19 is supplied to the molding material passage 36 of the gate valve 35.

Next, when the solenoid valve of the controller 40 is operated, the solenoid valve is switched so that the air of the air supply source is lowered from the third air inlet 46 to the cylinder 18 through the gate valve opening air supply passage 45. Air is supplied to the sub chamber 27b. Therefore, as shown in FIG. 2, the piston 29 in the cylinder chamber 27 is pushed up by the air to raise the gate valve 35 together with the piston 29. Since the valve pin 37 raises with the rise of the gate valve 35, and the valve pin 37 comes out of the gate 32 lumen, the molding material 19 in the molding material accommodating chamber 20 is formed of a molding material. It is injected into the mold main body 2 from the passage 36 through the gate 32.

That is, the molding material 19 is injected into the cavity 6 through the sprue 7 simultaneously with the opening of the gate 32. When the predetermined amount of paraffin 19 is filled in the cavity 6 and the sprue 7, the solenoid valve is switched in accordance with the signal of the timer so that the air from the air supply source is discharged through the air supply line 43 for closing the gate valve. 2 is supplied from the air inlet 44 to the upper chamber 27a.

Therefore, as shown in FIG. 3, since the piston 29 in the cylinder chamber 27 is lowered by the pressure of air, the gate valve 35 integral with the piston 29 is lowered so that the valve pin 37 is closed. Close the gate 32. In this case, since the valve pin 37 enters the lumen of the gate 32 and closes the gate 32, the outflow of the molding material 19 can be reliably prevented, and the molding material 19 from the gate 32 can be prevented. Can prevent falling.

Thus, after filling the molding material 19 with the cavity 6 and the sprue 7 of the mold main body 2, even when taking out the tester main body 15 from the mold main body 2, from the gate 32 The molding material 19 does not fall off and adhere to the mold main body 2.

The molding material 19 filled in the cavity 6 is cooled and solidified to obtain a dummy molded product. By taking out the dummy molded product from the cavity 6 and inspecting the dummy molded product by visual or microscopic examination, the finished state of the injection molding die, in particular the cavity 6, can be inspected.

In addition, the present invention is not limited only to the above embodiments, and the embodiment can be embodied by modifying the components within a range not departing from the gist of the embodiment. Moreover, various inventions can be formed by combining suitably the several component disclosed in the said Example. For example, some components may be deleted from all the components shown in the embodiments. In addition, the components of the other embodiments may be appropriately combined.

According to the configuration of the present invention, when the molding material in the molten state is introduced into the cavity and a certain amount of the molding material is filled, the flow of the molding material can be automatically stopped, and the molding material injected into the mold is sprue of the mold. It is possible to provide a tester of an injection molding mold that can reliably prevent leakage from an inlet, and a connector that reliably connects the tester and the mold.

Claims (4)

In the inspection machine of the injection molding mold for filling the molding material of the molten state in the cavity of the injection molding mold provided with a cavity between the fixed mold and the movable mold to form a dummy molded product to inspect the injection molding mold, A molding material tank having a material accommodating chamber for accommodating the molding material for forming the dummy molded article, and having a heating element for heating and melting the molding material in the material accommodating chamber; A cylinder communicating at the proximal end with the material receiving chamber of the molding material tank and connected at the distal end with a gate connected to the nozzle touch of the injection molding die; A piston moving freely in the cylinder by fluid pressure; A gate valve having a molding material passage which is inside the piston and integrally with the piston and moves freely in the cylinder and communicates with the material receiving chamber at the inside thereof, and has a valve pin at the front end to open and close the gate; , And a controller that executes control of switching of the fluid pressure in the cylinder, The gate is opened by retracting the gate valve under the control of the controller so that the molding material of the material accommodating chamber is introduced into the cavity through the gate, and after the molding material is introduced, the gate is closed by advancing the gate valve. An inspection machine for an injection molding die, characterized by preventing a molding material from entering the cavity. The method of claim 1, And the controller opens and closes the gate valve by advancing and retracting the piston by executing control of switching of the fluid pressure to the cylinder by a timer. The method of claim 1, And the gate of the cylinder is provided in contact with the nozzle touch of the injection molding die, and the gate valve is a valve pin for opening and closing the gate lumen. It is a connector which connects a tester and a metal mold | die of the injection molding metal mold of Claim 1, Screw shaft, A screw nut which is aligned with the screw axis and moves from side to side, A guide bolt installed to protrude from the screw nut and inserted into an elongated hole whose tip is provided in the radial length of the rotary ring; A rotating ring which is rotated forward and backward in the circumferential direction by moving the guide bolt left and right, A cam groove formed on the circumference of the rotary ring in a helical direction in a predetermined length; A base ring mounted below the rotary ring and provided with a moving wheel insertion hole in a position corresponding to the cam groove of the rotary ring; A moving wheel which protrudes a guide pin on the surface and inserts the guide pin into the cam groove of the rotary ring, The rotating ring is rotated by the cam mechanism to move the moving wheel in the insertion hole in the direction of the center of the rotary ring, thereby tightening the connector installed in the mold at the tip of the moving wheel. Coupler to connect mold with checker.

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