Injection molding machine

Abstract

This prevents the temperature of the connector, which is heated by the mold, from rising too quickly. [Solution] To solve the above problems, the injection molding machine of the present invention comprises a thermocouple 6 for measuring the temperature of a mold 1 for injection molding, a heater 5 for raising the temperature of the mold 1, a first sheet metal 9 to which a heater relay connector 17 and a thermocouple relay connector 18 are attached, and a second sheet metal 7 for connecting the first sheet metal 9 and the mold 1, wherein a first heat insulating member 10 is provided between the first sheet metal 9 and the heater relay connector 17 and the thermocouple relay connector 18, and a second heat insulating member 8 is provided between the second sheet metal 7 and the first sheet metal 9.

Description

Technical Field

[0001] The present invention relates to an injection molding machine having a heat insulation structure for a mold.

Background Art

[0002] In a conventional injection molding machine, a heater and a thermocouple are directly attached to the mold of the injection molding machine. In a large machine, where there is sufficient space, a thick heat insulation member is attached.

[0003] In Patent Document 1, there is a patent that improves operability with a general mold configuration for thermosetting resins. The core side has a convex shape and contacts the parting line (upper and lower contact surfaces) on the cavity side. A heat insulation member is provided at a portion where the device contacts the core side and cavity side of the mold, and heaters are provided on the side frame mold instead of the main mold to control the heating temperature. It is a mold device for thermosetting resin molding.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In molding with a liquid resin molding (LIM) molding machine, liquid resin is injected into a mold heated to around 200 degrees, and heat is applied for about one minute to cure it. To accommodate insert molding, the mold slides in the front-rear direction with respect to the device, and the mold clamping mechanism moves to clamp the mold. Since the mold slides, heaters, thermocouples, and screws for attaching them are attached via stays. Heat from the mold is transferred to the connector via the screws and stays, causing it to become hot. If molding is performed from morning to evening or continuous mass production operation is carried out, the mold will be at a high temperature for a long time, and there is a possibility that the connector heated by heat transfer from the mold will rise above the heat-resistant temperature.

Means for Solving the Problems

[0006] To solve the above problems, the injection molding machine of the present invention comprises a thermocouple for measuring the temperature of a mold for injection molding, a heater for raising the temperature of the mold, a first sheet metal to which the connectors of the heater and the thermocouple are attached, and a second sheet metal for connecting the first sheet metal and the mold, wherein a first heat insulating member is provided between the first sheet metal and the connectors of the heater and the thermocouple, and a second heat insulating member is provided between the second sheet metal and the first sheet metal. [Effects of the Invention]

[0007] According to the present invention, the heat-insulating structure prevents the temperature of the mounting sheet metal from rising when removing the heater and thermocouple. Furthermore, the heat-insulating structure prevents the temperature of the heater and thermocouple connector from rising. [Brief explanation of the drawing]

[0008] [Figure 1] Perspective view of a vertical injection molding machine. [Figure 2] External perspective view of the mold and mold attachment unit according to the present invention. [Figure 3] External perspective view of a mold attachment unit according to the present invention. [Figure 4] An exploded perspective view of the mold attachment unit according to the present invention. [Figure 5] External perspective view (from diagonally below) of the mold attachment unit according to the present invention. [Figure 6] External perspective view (from diagonally below) of the mold and mold attachment unit according to the present invention. [Modes for carrying out the invention]

[0009] An embodiment of the present invention applied to an injection molding machine will be described in detail. Figure 1 is a schematic diagram of an embodiment of a vertical injection molding machine.

[0010] The injection section will be described below. The injection motor 50 rotates the driven pulley 53 via the drive pulley 51 and injection belt 52, transmitting power to the injection ball screw 54, which moves the screw shaft up and down. A plunger guide 55, connected to the screw shaft, is guided by a guide post 56. The plunger 57 is screwed from below to the plunger guide 55 by a plunger holder 58. The load in the direction of the screw shaft is supported by an injection bearing (not shown) and the injection ball screw 54.

[0011] The resin material is delivered to the injection cylinder 60 through the material supply holder 59. The resin material may be supplied by a manual gun-type dispenser, or, as with liquid thermosetting resins, a fully automatic pump-metering and discharge volume control device may be attached.

[0012] Molding is performed by setting the mold 1, described later, on the movable plate 61 which moves up and down. The mold 1 can be separated into an upper mold and a lower mold, and when the molding machine completes the mold clamping, the upper mold and the lower mold come together without any gaps. The movable plate 61 rises, and the lower mold set on the movable plate 61 and the upper mold set on the intermediate plate 62 come together and reach the fixed plate 65 to perform mold clamping.

[0013] After clamping the mold, resin is injected from the injection section mentioned above to perform molding. After lowering the movable plate 61 to its lowest position, the lower mold may be advanced to the slide block 64 by the slide cylinder 63. This makes it easier to insert parts into the mold.

[0014] Figures 2-6 show examples of the appearance of the mold insulation structure according to this embodiment.

[0015] As shown in Figure 3, there is a thermocouple 6 for temperature measurement and a heater 5 for raising the temperature of the mold 1. The heater relay connector 17 and the thermocouple relay connector 18 are connected to the first heat insulating member 10, the first sheet metal 9 is connected to the first sheet metal 9, the second heat insulating member 8 is connected to the second heat insulating member 8, and the mold 1 is connected to the second sheet metal 7.

[0016] In this embodiment, the heater 5 uses a bar heater, but the shape of the heater is not limited.

[0017] The second heat insulating member 8 and the third sheet metal 13 are fixed by a one-touch detachable member 14, and the third sheet metal 13 is connected to the top surface of the second heat insulating member 8. Pressing the button of the one-touch detachable member 14 once fixes it, and pressing the button again releases it, and it is divided into the first joining member 15 and the second joining member 16 as shown in FIG. 4. In this embodiment, a one-touch detachable member 14 is used, but a two-touch detachable member may also be used. The mold 1 slides in the front and back directions, a cable carrier 19 is attached to the third sheet metal 13, and cables extending from the relay connector 11 for the heater and the relay connector 12 for the thermocouple pass through the inside of the cable carrier 19. The relay connector 11 for the heater and the relay connector 12 for the thermocouple can be removed by pulling while turning by hand, and can be separated into the male relay connector 11 for the heater and the relay connector 12 for the thermocouple and the female relay connector 17 for the heater and the relay connector 18 for the thermocouple. Conversely, it can be attached by pushing it in. As shown in FIG. 4, by removing the relay connector 11 for the heater and the relay connector 12 for the thermocouple and pressing the one-touch detachable member 14 to remove the third sheet metal 13 from the second heat insulating member 8, the mold accessory unit 3 and the unit 4 attached to the third sheet metal can be separated.

[0018] FIG. 5 is a perspective view of the mold accessory unit 3 according to the present invention as viewed obliquely from below. At the portions where the relay connector 17 for the heater and the relay connector 18 for the thermocouple are attached to the first sheet metal 9 and the first heat insulating member 10, U-shaped holes are formed in the first sheet metal 9 and the first heat insulating member 10 respectively. By passing the cable after soldering through the U-shaped holes, it is made easy to replace. The U-shaped hole has a shape in which a part of a circle is missing.

[0019] FIG. 6 is a perspective view of the mold 1 and the mold accessory unit 3 according to the present invention as viewed obliquely from below. A heater 5 is attached to the mold 1, but it is not known where the mounting holes for the heater 5 will be on the product layout of the mold 1. Therefore, the second sheet metal 7 has an L-shaped sheet metal form so that it can cope with any location of the hole. The attachment surface to the mold 1 has a U-shaped hole form, can be shifted in the left-right direction, and the fixed position can be changed according to the mold 1. The U-shaped hole form is a form in which one end of the long hole in the left-right direction is open, the height in the vertical direction is the same dimension as the outer diameter dimension of the flange of the heater, and the heater can be inserted from the side surface direction of the mold 1.

[0020] The first sheet metal 9 and the second first heat insulating member 10 are joined by a screw 21, the heater relay connector 17 is joined to the second heat insulating member 8 by a screw 22, the first sheet metal 9 and the second heat insulating member 8 are joined by a screw 20, and the second heat insulating member 8 and the second sheet metal 7 are joined by a screw 23. The second sheet metal 7 has a U-shaped relief so as not to hit the tip of the screw 20, and the first sheet metal 9 has a relief shape so as not to touch the head of the screw 23.

Explanation of Signs

[0021] 1 ··· Mold 3 ··· Mold accessory unit 4 ··· Third sheet metal accessory unit 5 ··· Heater 6 ··· Thermocouple 7 ··· Second sheet metal 8 ··· Second heat insulating member 9 ··· First sheet metal 10 ··· First heat insulating member 11 ··· Heater relay connector (male side) 12 ··· Thermocouple relay connector (male side) 13 ··· Third sheet metal 14 ··· One-touch detachable member 15 ··· First joint part of the detachable member (female side) 16 ··· First joint part of the detachable member (male side) 17 ··· Heater relay connector (female side) 18. Thermocouple connector (female side) 19. Cable Carrier 20-23... screws

Claims

1. Thermocouples for measuring the temperature of molds used for injection molding, A heater for raising the temperature of the mold, A first sheet metal to which the heater and the thermocouple connectors are attached, The first sheet metal and the second sheet metal for connecting the mold are provided, Between the first sheet metal and the connectors of the heater and the thermocouple, there is a first heat insulating member and An injection molding machine characterized by having a second heat insulating member between the second sheet metal and the first sheet metal.

2. The injection molding machine according to claim 1, characterized in that the heater is rod-shaped, the second sheet metal has a U-shaped end, the inside of the U-shaped hole is the outer diameter of the heater, and the heater can be fixed in a different position in the left-right direction.

3. An injection molding machine according to claim 1, wherein a third sheet metal is joined to the upper surface of the second heat insulating member, the second heat insulating member side has a first joint portion of the detachable member, and the third sheet metal side has a second joint portion of the detachable member, and the first joint portion and the second joint portion are detachable.

4. An injection molding machine according to any one of claims 1 to 3, characterized in that the joining member that fixes the second sheet metal and the second heat insulating member does not come into contact with the first sheet metal, and the joining member that fixes the second heat insulating member and the first sheet metal does not come into contact with the second sheet metal.

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