JP2010042520A - Hot-melt molding device, manufacturing method for detecting switch with lead wire using the same, and detecting switch with lead wire manufactured by the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-melt molding device capable of regulating an injection amount of a hot-melt material, and capable of enhancing transferability of a molding die shape, a manufacturing method for a detecting switch with a lead wire using the device, and the detecting switch with the lead wire manufactured by the manufacturing method. <P>SOLUTION: The detecting switch 61 with the lead wire 65 is sealed in a molding die 4, using the hot-melt molding device 1 comprising an injection means 2 for weighing and injecting the hot-melt material 8, a valve gate part 3 for regulating the injection of the hot-melt material 8 in the injection means 2, and a cavity 9 injected with the hot-melt material 8 from the injection means 2 through the valve gate part 3, and a connection portion to the lead wire 65 or a leading-out portion of the lead wire 65 is partially molded with the hot-melt material 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot-melt molding device, a method for manufacturing a detection switch with a lead wire using the device, and a detection switch with a lead wire manufactured by the method.

  Conventionally, when a lead wire is attached to a detection switch that detects the opening and closing of the door of a car or a lever position that is required to be waterproof or dust-proof, or a connector that connects the switch to the end, the lead wire There is a method of sealing with a sealing material made of epoxy resin in order to protect the wire connecting portion or the lead wire drawing portion from water or dust.

  However, since it is made of epoxy resin, there is a problem that it takes time to cure the sealing material.

  In view of this, a method has been conceived in which a molding die is used to mold and protect the connection portion with the lead wire or the lead wire lead-out portion of the detection switch or the like with a hot melt material.

  This is because the above-mentioned detection switch with a lead wire is sealed in a molding die, and the molten hot melt material is injected into the molding die with an air pump or a gear pump and cured, so that the detection switch etc. This is a method for protecting the lead wire connection portion or lead wire lead-out portion (see, for example, Patent Document 1).

However, since the injection pressure is low for air pumps and gear pumps, it is difficult to adjust the injection amount, the transferability of the mold shape is poor, and the lead wire connection part such as the detection switch or the lead wire lead-out part is not molded. Has the problem of low reproducibility.
JP-A-9-223435

  Therefore, the present invention has been invented in view of the above-mentioned conventional problems, and a hot melt molding apparatus capable of adjusting the injection amount and improving the mold shape transferability, and a lead wire using the apparatus. The present invention provides a method for manufacturing a detection switch with a contact, and a detection switch with a lead wire manufactured by the method.

  In order to solve the above problems, the hot melt molding apparatus 1 of the present invention includes an injection means 2 for measuring and injecting a hot melt material 8, and a valve gate section 3 for adjusting the injection of the hot melt material 8 of the injection means 2. And a molding die 4 for forming a cavity 9 into which the hot melt material 8 is injected from the injection means 2 via the valve gate portion 3, wherein the valve gate The section 3 is arranged below the injection means 2 and has a hot runner 31 for heating the hot melt material 8 that circulates, and a gate for injecting the hot melt material 8 heated by the hot runner 31 into the cavity 9. 33 and a gate valve pin 34 that opens and closes the gate 33, and the molding die 4 is an upper die 4 on which the gate 33 is disposed above. And the lower die 42 positioned below the upper die 41, and the insert product 6 with the lead wire 65 is sealed in the cavity 9, and the connecting portion or lead to the lead wire 65 of the insert product 6 The lead portion of the line 65 is molded.

  With such a configuration, the injection pressure of the hot melt material 8 can be improved, and the hot melt material 8 to be injected can be measured.

  Further, if the forming surface 43 forming the cavity 9 of the molding die 4 is the molding die 4 in which the ratio of the lower die 42 is larger than that of the upper die 41, the insert product 6 that contacts the lower die 42. The area of can be increased.

  Further, if the molding die 4 is formed by coating the forming surface 43 with fluorine, the molding part 66 formed on the connecting portion of the insert 6 with the lead wire 65 or the lead wire 65 lead portion is the molding die. 4 is preferred because it is difficult to bite.

  Moreover, since the medium for temperature adjustment flows in the flow path with negative pressure by using the molding die 4 for adjusting the temperature of the molding die 4 by the negative pressure type temperature adjusting means 46, a molded insert product is used. Even if there is a sliding portion 47 such as an ejector block for releasing 6 in the flow path, and a gap is formed between the molding die 4 due to the sliding of the sliding portion 47, a medium for adjusting the temperature is provided. It is preferable because it can prevent leakage from the gap.

  Further, by providing a fixing member 7 for fixing the insert product 6 to the molding die 4 in the gap between the insert product 6 and the cavity 9, the insert product 6 can be applied at the injection pressure when the hot melt material 8 is injected. Is preferable because it can suppress the movement.

  In addition, when the insert product 6 has a protrusion 67, the molding die 4 includes a holding portion that meshes with the protrusion 67 and fixes and holds the insert product 6. It is preferable that the insert product 6 itself can be prevented from moving by the injection pressure at the time of injection.

  In addition, when the gate 33 is the valve gate portion 3 protruding into the cavity 9, the gate 33 and the mold in the vicinity of the gate 33 can be formed to be recessed from other portions.

  Moreover, the manufacturing method of the switch 61 for detection with the lead wire 65 of this invention is the said switch 61 for detection with the lead wire 65 using the hot-melt molding apparatus 1 as described in any one of Claim 1-7. The lead wire 65 is sealed by sealing the cavity 9, the mold 4 is closed, and the hot melt material 8 is injected from the injection means 2 into the cavity 9 via the valve gate portion 3. In this method, the connecting portion of the attachment detection switch 61 with the lead wire 65 or the lead-out portion of the lead wire 65 is molded with the hot melt material 8.

  When manufactured by such a method, the hot melt material 8 can be injected at a high injection pressure, and the hot melt material 8 to be injected can be measured.

  In addition, the detection switch 61 with the lead wire 65 of the present invention can be configured such that the connecting portion with the lead wire 65 of the detection switch 61 with the lead wire 65 or the lead-out portion of the lead wire 65 is the manufacturing method according to claim 8. The hot-melt material 8 is molded.

  With such a configuration, an optimal amount of hot melt material 8 can be injected and molded at a high injection pressure.

  As described above, the molding apparatus according to the present invention improves the transferability of the mold shape in the mold of the insert product by improving the injection pressure of the hot melt material and allowing the injection amount to be measured. A highly reproducible mold can be formed.

  In addition, since there is no valve gate part and injection means on the lower mold side, it is easy to arrange auxiliary means for improving work efficiency, for example, temperature adjustment means, and the area of the insert product in contact with the lower mold is increased. Therefore, it is possible to improve the efficiency such as temperature control of the molding die, and shorten the working time in molding.

  Further, when the mold applied to the insert product is difficult to bite into the mold, the mold releasability is increased, the damage to the mold is reduced, and the mold shape transferability is improved.

  Further, since the medium for temperature adjustment is prevented from leaking through the gap in the flow path, the flow path can be brought closer to the cavity side, and the temperature control efficiency of the molding die is improved.

  In addition, the movement of the insert product due to the injection pressure at the time of hot melt material injection is suppressed by the fixing member, thereby preventing damage to the insert product due to the injection pressure and occurrence of dimensional errors.

  In addition, since the insert product with lead wire itself is restrained from moving by the injection pressure during hot melt material injection, it is necessary to place another member in the cavity in addition to the insert product with lead wire when the mold is closed. No breakage of inserts due to injection pressure and generation of dimensional errors.

  In addition, by forming the insert gate and the mold near the gate indented from other parts, even if the gate and the mold near the gate rise due to poor opening and closing of the gate, it becomes difficult to protrude from the other mold parts, Suppresses dimensional errors caused by the rise near the gate.

  Further, since the injection pressure of the hot melt material is improved and the injection amount can be measured, a mold having a high mold shape transferability and a high reproducibility can be formed in the detection switch with a lead wire.

  In addition, a mold for injection with an optimal amount of hot melt material injected at a high injection pressure improves the mold shape transferability and allows the formation of a mold with high reproducibility. It becomes.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  As shown in FIGS. 1 to 3, the hot melt molding apparatus 1 of the present invention includes an injection means 2 for measuring and injecting the hot melt material 8 and a gate 33 for adjusting the injection of the hot melt material 8 by the injection means 2. The provided valve gate portion 3, the molding die 4 for forming the cavity 9 into which the hot melt material 8 is injected from the injection means 2 through the valve gate portion 3, the injection and temperature of the hot melt material 8, etc. And a control means 5 for controlling the hot melt molding apparatus 1.

  The hot melt molding apparatus 1 has a configuration in which the injection means 2, the valve gate portion 3, the molding die 4, and the control means 5 are arranged in this order from above.

  The injection means 2 is, for example, an injection molding machine. Specifically, the screw 22 is rotationally driven by a motor 21, a cylinder 23 that covers the periphery of the screw 22 in the axial direction, and a hot melt in the cylinder 23. A material input unit 25 for supplying the material 8 from the outside, a nozzle 24 provided at the tip of the cylinder 23, and a measuring mechanism 26 are included.

  The cylinder 23 is provided with a heating means (not shown in particular) for warming the hot melt material 8 to a temperature at which the hot melt material 8 can be melted. is there.

  Further, the molten hot melt material 8 is injected from the nozzle 24 by the rotating screw 22 and injected into the valve gate portion 3.

  At this time, the measuring mechanism 26 measures the rotational speed of the screw 22 and the flow velocity of the hot melt material 8 in the nozzle 24, and calculates the amount of the injected hot melt material 8 based on the measurement result. .

  The valve gate unit 3 includes a hot runner 31 into which the hot melt material 8 is injected from the nozzle 24, and two conical gates 33 that inject the hot melt material 8 from the hot runner 31 into the cavity 9. And gate valve pins 34 for opening and closing each gate 33, respectively.

  The hot runner 31 is covered with a heater 32 to keep the hot melt material 8 injected from the nozzle 24 in a molten state, and is gated toward the mold 4 at both ends in the longitudinal direction. 33 is provided.

  Furthermore, a gate valve pin 34 for opening and closing the gate 33 is located in the internal space of the gate 33 where the hot melt material 8 flows.

  The gate valve pin 34 includes a gate engaging portion 35 that closes the gate 33 by engaging the gate 33 at one end, and a drive mechanism 36 that opens and closes the gate 33 by operating the gate valve pin 34 at the other end. Is.

  Then, the gate valve pin 34 is moved toward the gate 33 by the drive mechanism 36, for example, a hydraulic piston, the gate engaging portion 35 is engaged with the gate 33, the gate 33 is closed, and the hot melt material 8 Stop injection into cavity 9.

  The shape of the gate engaging portion 35 of the gate valve pin 34 and the driving mechanism 36 may be any one that opens and closes the gate 33.

  The molding die 4 includes a fixed platen 11 provided with a rotatable turntable 14 on the upper side, a plurality of, for example, four lower molds 42 installed on the turntable 14, and one of the lower molds 42. An upper mold 41 located above and having the gate 33 disposed thereon, and the upper mold 41 is fixed and moves in the vertical direction (A direction) with respect to the fixed platen 11 to perform mold closing and mold opening of the mold 4. The movable platen 12 includes a plurality of tie bars 13 that guide and support the movement of the movable platen 12, and a drive unit (not shown) that moves the movable platen 12 up and down.

  As shown in FIG. 2, the upper mold 41 and the lower mold 42 of the molding die 4 have two formation surfaces 43 for forming the cavities 9 on the same plane. 9 is formed at a time.

  Then, the hot melt material 8 is injected into the respective cavities 9 from the gates 33 to simultaneously form the mold portions 66 in the two inserts 6.

  Further, as shown in FIG. 4A, each forming surface 43a of the upper mold 41 is a mold of a contact surface 44a that is in contact with and fixedly held by the insert product 6, and a mold portion 66 of the insert product 6. The injection surface 45a to be injected is provided with two types of surfaces.

  The injection surface 45a is provided with a gate 33 opening toward the cavity 9 as shown in FIG.

  Further, each forming surface 43b of the lower mold 42 is a mold of a contact surface 44b that is in contact with and fixed to the insert product 6 and a mold portion 66 of the insert product 6 as shown in FIG. The injection surface 45b is provided with two types of surfaces.

  Further, since the hot melt molding apparatus 1 has a vertically arranged configuration, unlike the upper mold 41, the lower mold 42 has no facility for injection of the hot melt material 8 such as the gate 33, and the molding mold 4 before and after molding. It is easy to arrange temperature adjusting means for adjusting the temperature and auxiliary means such as an ejector for releasing the molded insert 6.

  And in order to make it easy to obtain effects such as temperature adjustment on the molding die 4 by the auxiliary means, the ratio of forming the cavity 9 between the upper die 41 and the lower die 42 is as compared with the upper die 41 as shown in FIG. The ratio of the lower mold 42 was increased.

  The control means 5 includes an operation unit 51 for operating the hot melt molding apparatus 1 and a display unit 52 for displaying the control status. The injection means, the opening / closing of the gate 33, the mold closing and the mold. Opening and control adjustment in the hot melt molding apparatus 1 such as temperature adjustment of the cylinder 23 and the lower mold 42 are performed.

  The amount of hot melt material 8 injected by the control means 5 may be calculated from the measurement result of the weighing means 6.

  Of course, each equipment of the said hot-melt-molding apparatus 1 is not limited only to the thing of a figure and illustration, As long as it does not exceed the claim of this invention, all can be changed suitably.

  Hereinafter, a method of forming the mold part 66 with the hot melt material 8 on the connecting portion with the lead wire 65 of the detection switch 61 with the lead wire 65 or the drawing portion of the lead wire 65 using the hot melt molding apparatus 1 will be described. To do.

  Although the two detection switches 61 are molded at a time because of the shape of the molding die 4, the same procedure and configuration are used, so only one detection switch 61 will be described.

  The detection switch 61 molded at the connection portion with the lead wire 65 or the lead-out portion of the lead wire 65 is, for example, a push button type detection switch as shown in FIG.

  The push button detection switch includes a switch body 62 forming a body, a switch mechanism (not shown) provided inside the switch body 62, and a push button 63 provided on a side surface of the switch body 62. And a terminal 64 provided on the opposite side surface of the push button 63, and when the push button 63 is pushed to the switch body 62 side from the outside, the switch mechanism is activated to cut off the electric circuit of the detection switch 61 or By energizing, an external operation such as opening and closing of a car door is detected.

  In addition, lead wires 65 and 65 are connected to two of the three terminals 64 of the detection switch 61 to form a detection switch 61 with a lead wire 65.

  Then, the detection switch 61 with the lead wire 65 is disposed in the cavity 9, the movable platen 12 is lowered toward the fixed platen 11, the mold is closed, and the detection switch 61 with the lead wire 65 is sealed.

  Further, with the gate 33 closed, the hot melt material 8 is charged into the cylinder 23 and melted, and a necessary injection amount is measured while filling the hot runner 31.

  Thereafter, the gate 33 is opened, the measured hot melt material 8 is injected and injected into the cavity 9, and the connection portion of the detection switch 61 with the lead wire 65 and the lead wire 65 is molded.

  Then, after the mold 4 is cooled, the mold is opened and removed from the mold 4, thereby detecting the switch with the lead wire 65 in which the mold portion 66 is formed at the connection portion with the lead wire 65 as shown in FIG. 61 is manufactured.

  The detection switch 61 with the lead wire 65 includes all the terminals 64 provided with the lead wire 65, the switch body 62 provided with the terminal 64 inside, and the lead wire 65 drawn from the detection switch 61, Instead of the push button type, a leaf lever may be provided, and can be appropriately changed as long as it does not exceed the scope of the claims of the present invention.

  As another example, the hot melt apparatus 1 is provided with a sliding portion 47 and a negative pressure type temperature adjusting means 46 for flowing a temperature adjusting medium by a negative pressure, as shown in FIG. It is.

  For example, the negative pressure type temperature adjusting means 46 causes the molding die 4 to flow in the molding die 4 with a negative pressure such as sucking a heating fluid such as steam or hot water or a cooling fluid such as cold water with a pump. The temperature is adjusted.

  The sliding portion 47 is, for example, a slide core that forms an undercut in the mold portion 66 or an ejector block that removes the insert product 6 molded as shown in FIG. 9 from the lower mold 42.

  When the sliding portion 47 slides, a gap may be generated in the flow path of the temperature adjusting means in the molding die 4. When the temperature adjusting means is disposed in contact with the sliding portion 47, the temperature is generated from the gap. There is a possibility that the temperature adjusting fluid for adjusting may leak to the outside.

  However, by using the negative pressure type temperature adjusting means 46, even if the sliding portion 47 slides and a gap is generated in the flow path of the negative pressure type temperature adjusting means 46, outside air enters the flow path from the gap, The temperature can be adjusted without leaking the temperature adjusting fluid to the sliding portion 47 that slides.

  Further, as shown in FIG. 10, when the fluorine coating is performed on each injection surface 45 of the molding die 4, the mold becomes difficult to bite into the molding die 4, and the mold release property can be improved. The fluorine coating may be performed not only on the injection surface 45 but also on the entire formation surface 43.

  Further, FIG. 11 shows that the insert product 6 is moved by the injection pressure of the hot melt material 8 when there is a gap between the insert product 6 and the molding die 4 and the fixing of the insert product 6 to the molding die 4 is insufficient. Since there is a concern, the fixing member 7 is in contact with a place other than a movable part such as a push button of the insert product 6 and is fitted in the gap, and the insert product 6 is fixed to the molding die 4.

  Therefore, since the insert product 6 is stably fixed to the molding die 4 by the fixing member 7, the insert product 6 does not move or be damaged by the injection pressure of the hot melt material 8, and no dimensional error occurs. Molding is possible, and the mold shape transferability is improved.

  Even if there is some difference in the shape of the insert product 6 before forming the mold portion 66, such as a notch, it can be fixed by filling the gap with the fixing member 7, so that the insert product has a similar shape. Even in this case, the same molding die 4 can be used for molding.

  Further, if the insert 6 has a protrusion 67 such as an engaging part for installation and fixing as a detection means at a predetermined position of an automobile or the like, the fixing member 7 such as a leaf lever type detection switch is fitted. Even if the insert 6 cannot be provided, the insert 67 may be fixed to the molding die 4 by engaging the projection 67 with the holding portion 48 of the molding die 4 as shown in FIG.

  As the fixing member 7 and the holding portion 48, a sliding portion 47 is provided on the molding die 4, and the sliding portion 47 is moved in accordance with the shape of the insert product 6 to change the shape of the contact surface 44, thereby inserting the insert product. 6 may be fixedly held.

  Further, as shown in FIG. 13, when the gate 33 is protruded into the cavity 9 of the upper die 41, the gate 33 of the mold portion 66 is recessed by the protrusion of the gate 33, so that the gate 33 of the gate valve pin 34 is delayed in closing. Even if a malfunction such as the above occurs and the vicinity of the gate 33 of the mold part 66 rises, the protruding amount with respect to the other mold parts 66 can be suppressed.

It is a perspective view of the Example of the hot-melt-molding apparatus of this invention. It is a block diagram of a hot melt molding apparatus same as the above. It is an important point enlarged view of a hot-melt-molding apparatus same as the above. It is (a) top view and (b) AA sectional view of an upper model same as the above. It is (a) top view of the lower mold | type same as the above, (b) It is BB sectional drawing. It is a block diagram of the shaping | molding metal mold | die closed same as the above. It is (a) front view, (b) top view, (c) side view of the switch for a detection same as the above. It is (a) front view, (b) top view, (c) side view of the molded switch for detection same as the above. It is a block diagram of a negative pressure temperature control means same as the above. It is a block diagram of the lower mold | die which carried out the fluorine coating of the other example same as the above. It is a block diagram which fixed the insert product of the other example same as the above with the fixing member. It is a block diagram of the lower mold | type which has a holding part of the other example same as the above. It is the block diagram which the gate of the other example same as the above protruded in the cavity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot melt molding apparatus 2 Injection | pouring means 3 Valve gate part 4 Molding die 8 Hot melt material

Claims (9)

  Injection means for measuring and injecting hot melt material, valve gate portion for adjusting injection of hot melt material of the injection means, and cavity into which the hot melt material is injected from the injection means via the valve gate portion A hot melt molding apparatus comprising: a hot runner for heating the circulating hot melt material, wherein the valve gate portion is disposed below the injection means, and the hot runner. The mold includes a gate for injecting the heated hot melt material into the cavity, and a gate valve pin for opening and closing the gate. The molding die includes an upper mold in which the gate is disposed above, and an upper mold And a lower mold located below, and an insert product with a lead wire is sealed in the cavity, and a lead of the insert product is sealed. Hot melt molding apparatus characterized by molding the connection portion or lead portion of the lead of the line.   The hot melt molding apparatus according to claim 1, wherein a forming surface for forming a cavity of the molding die is the molding die having a larger proportion of the lower die than the upper die.   The hot melt molding apparatus according to claim 1 or 2, wherein the molding die is formed by performing fluorine coating on the forming surface.   The hot melt molding apparatus according to any one of claims 1 to 3, wherein the molding die is configured to perform temperature regulation of the molding die by a negative pressure type temperature regulating means.   The hot melt molding apparatus according to any one of claims 1 to 4, wherein a fixing member for fixing the insert product to the molding die is provided in a gap between the insert product and the cavity.   6. The molding die according to claim 1, further comprising a holding portion that meshes with the protrusion and fixes and holds the insert when the insert has a protrusion. The hot melt molding apparatus described in 1.   The hot melt molding apparatus according to any one of claims 1 to 6, wherein the gate is the valve gate portion protruding into the cavity.   Using the hot melt molding apparatus according to any one of claims 1 to 7, a detection switch with a lead wire is sealed in the cavity, the mold is closed, and the injection means A hot melt material is injected into the cavity via a valve gate portion, so that a connection portion with a lead wire of the detection switch with a lead wire or a lead wire lead portion is molded with the hot melt material. Manufacturing method of switch for detection with lead wire.   9. The detection switch with lead wire according to claim 8, wherein a connection portion with the lead wire of the detection switch with lead wire or a lead wire drawing portion is molded with the hot melt material.

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