JP5265219B2 - Insert molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert molding method which easily manufactures an insert molded article in which an intermediate piece intervenes between an insert component and resin molded part while maintaining highly positional accuracy between an insert component and resin molded part. <P>SOLUTION: A first component 2 is arranged in a cavity of a molding device 10, and a second component 3 having a member which the first component 2 combines with is arranged to the first component 2. The first component 2 is pressing against to the second component 3, and the first component 2 is combined with the second component 3. The injection molding of a plastic section 4 is carried out to the circumference of the second component 3. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an insert molding method, and more particularly to an insert molding method for molding an insert molded product that requires positional accuracy of a resin molded portion with respect to an inserted part.

  For example, a technique for manufacturing a bearing component by integrally molding a resin around a metal shaft is known. FIG. 1 is a sectional view showing an example of such a bearing component.

  In FIG. 1, the bearing component 1 includes a metal shaft 2, a metal intermediate component 3, and an outer peripheral resin portion 4 formed on the outer periphery of the intermediate component. A part of the outer periphery of the outer peripheral resin portion 4 functions as a rotary sliding portion and is rotatably supported by the bearing portion of the bearing support 5. Further, the tip end of the shaft 2 extending from the intermediate part 3 is configured to be fixed to the rotating shaft 6. For example, the tip of the shaft 2 is press-fitted into the hole of the rotating shaft 6 and fixed. Thereby, the rotating shaft 6 is rotatably supported by the bearing support 5 via the bearing component 1.

  When manufacturing the bearing component 1 described above, the outer peripheral resin portion 4 can be integrally molded around the intermediate component 3 by an insert molding method. By using the insert molding, the shaft 2 and the outer peripheral resin portion 4 can be easily formed as an integral part. The intermediate part 3 is a part for firmly fixing the shaft 2 and the outer peripheral resin part 4. The shaft 2 is firmly fixed to the intermediate part 3 by press-fitting, and the outer peripheral resin portion 4 is firmly joined using the large outer peripheral surface of the intermediate part 3. The press-fitting of the shaft 2 into the intermediate part 3 is performed after the outer peripheral resin portion 4 is insert-molded around the intermediate part 3.

Here, an insert molding method in which a resin part is integrally molded with respect to a shaft has been proposed (for example, see Patent Document 1). In the insert molding method disclosed in Patent Document 1, a plating film is applied to a part of a shaft, and a resin component is molded on the plating film. By deforming the end portion of the plating film toward the resin component by a mold during molding, the resin component is fixed around the shaft by the plating film.
JP 2006-170260 A

  In order to manufacture the bearing component 1 shown in FIG. 1, after the outer peripheral resin portion 4 is insert-molded around the intermediate component 3, the shaft 2 is press-fitted into the intermediate component 3. Therefore, if the position accuracy of the center of the hole into which the shaft 2 is press-fitted is not good with respect to the center of the outer peripheral surface of the intermediate part 3, the center of the outer peripheral surface of the outer peripheral resin portion 4 (functioning as a rotational sliding portion) The shaft 2 cannot be accurately aligned with the center of the hole into which the shaft 2 is press-fitted. As a result, the center of the press-fitted shaft 2 and the center of the outer peripheral surface of the outer peripheral resin portion 4 do not coincide with each other, resulting in an eccentric state. For this reason, in order to obtain dimensional accuracy, the intermediate part 3 must be manufactured using precision machining by machining, which has been a factor in increasing the manufacturing cost of the bearing part 1.

  On the other hand, according to the insert molding method described in Patent Document 1 described above, the shaft with a plating film is attached to the mold and the resin component is directly molded around the shaft, so the positional accuracy of the resin component and the shaft is compared. Can be high. Further, by applying a plating film to the shaft instead of using the intermediate component, the resin component is fixed to the shaft, so that insert molding is possible without using the intermediate component, and the number of components is reduced. However, in the insert molding method described in Patent Document 1, it is necessary to apply a plating film to the shaft, which complicates the manufacturing process of the shaft and increases the manufacturing cost. However, the manufacturing cost may increase.

  The present invention has been made in view of the above-described problems, and easily maintains an insert molded product in which an intermediate part is interposed between the insert part and the resin molded part while maintaining high positional accuracy between the insert part and the resin molded part. An object of the present invention is to provide an insert molding method that can be manufactured.

In order to achieve the above object , according to one aspect of the present invention,
Placing a first part within a cavity of a mold apparatus and placing a second part with a portion to which the first part is coupled to the first part;
Pressing the first part toward the second part to couple the first part to the second part;
A resin part is injection molded around the second part ,
An insert molding method is provided , wherein a state of connection of the first part to the second part is determined by a detection value of a mold clamping force detector .

  According to the present invention, while maintaining high positional accuracy between the first component and the outer surface of the resin portion, an insert molded product in which the second component is interposed between the first component and the resin portion is easily manufactured. can do.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a cross-sectional view of a mold apparatus for performing insert molding by the insert molding method according to the embodiment of the present invention. A mold apparatus 10 shown in FIG. 2 is a mold apparatus used for insert-molding the bearing component 1 shown in FIG.

  The mold apparatus 10 includes a movable mold 10A and a fixed mold 10B. In FIG. 2, the boundary (so-called parting line) between the movable mold 10A and the fixed mold 10B is indicated by a thick line PL. The left side of the thick line PL is the movable mold 10A, and the right side is the fixed mold 10B. The state shown in FIG. 2 is a state in which the mold apparatus 10 is closed, and when the mold is opened, the movable mold 10A moves leftward in FIG.

  The movable mold 10A includes a movable mold middle plate portion 12 between a movable mold attachment plate portion 11 attached to the movable platen 20 and a movable mold plate portion 13 whose end surface forms the parting line. It has a provided structure. In addition, spacer blocks 14 of ejectors (not shown) are respectively formed on the upper and lower portions between the movable mold mounting plate portion 11 and the movable mold middle plate portion 12. A space is formed in a portion surrounded by the spacer block 14, and the molded product ejecting rod 15 and the first projecting plate 16 and the second projecting plate 16 sandwiching the rear end portion of the projecting rod 15 in the space. And a protruding plate 17 are provided.

  The fixed mold 10 </ b> B is attached to the fixed platen 22. Molten resin is supplied to the fixed mold 10B from the nozzle 31 at the tip of the heating cylinder 30 of the injection device. Inside the fixed mold 10B, a passage (runner) 18 is formed for flowing molten resin and guiding it to the cavity. That is, at one end of the runner 18, a nozzle touch portion 18 a formed on the side surface of the fixed mold 10 </ b> B is formed. The nozzle 31 at the tip of the heating cylinder 30 is connected to the nozzle touch portion 18 a, and the resin melted and measured by the heating cylinder 30 is supplied to the runner 18.

  The other end of the runner 18 is a gate 19, and the runner 18 is connected to the cavity via the gate 19. Therefore, the molten resin supplied to the runner 18 is filled into the cavity via the gate 19, and the molten resin is solidified to form the outer peripheral resin portion 4 of the bearing component 1.

  More specifically, between the outer peripheral surface of the intermediate part 3 and the inner surface of the cavity in a state where the shaft 2 and the intermediate part 3 of the bearing part 1 are accommodated in the cavity formed in the movable mold 10A. The molten resin is filled into the outer peripheral resin portion 4. One end side of the shaft 2 is press-fitted into the intermediate part 3 during the insert molding as will be described later. On the other hand, the other end of the shaft 2 is inserted into the through hole 40 extending from the cavity in the initial stage of the insert molding process. An ejector pin 42 is inserted into the through hole 40 from the side opposite to the side where the shaft 2 is inserted.

  The ejector pin 42 is configured to be able to advance and retract within the through hole 40. One end of the ejector pin 42 is connected to the ejection rod 15 of the above-described ejector, and the ejector pin 42 can be advanced and retracted by driving the ejector. After the insert molding is completed and the mold apparatus 10 is opened, the ejector pin 42 is advanced to push the insert molded bearing part 1 out of the cavity of the movable mold 10A.

  Note that four tie bars 24 (only one is shown in FIG. 2) extend from the fixed platen 22, and the movable platen 20 is configured to advance and retract along the tie bars 24. . A mold clamping force sensor 26 is attached to the tie bar 24, and a mold clamping force at the time of mold clamping is detected by the mold clamping force sensor 26. A detection signal from the mold clamping force sensor 26 is supplied to a control unit 28 that controls the mold clamping operation.

  Next, an insert molding method according to an embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a process when insert-molding the bearing component 1 by the insert-molding method according to the embodiment of the present invention. In the insert molding method shown in FIG. 3, the shaft 2 of the bearing part 1 is press-fitted into the intermediate part 3 by a clamping force applied to the movable mold.

  First, as shown to Fig.3 (a), the front-end | tip of the axis | shaft 2 as a 1st component is inserted in the through-hole 40 currently opened in the cavity of 10 A of movable mold | dies, Then, 2nd component The intermediate part 3 is accommodated in the cavity so that the other end side of the shaft 2 extending into the cavity is inserted into the center hole of the intermediate part 3. An ejector pin 42 is inserted into the through hole 40 from the opposite side, and the shaft 2 is stopped in a state where the ejector pin 42 abuts.

  The central hole of the intermediate part 3 is a large-diameter hole having an inner diameter slightly larger than the outer shape of the shaft 2 on the entrance side, and a small-diameter hole having an inner diameter slightly smaller than the outer shape of the shaft 2 on the back side. . The inner diameter of the small-diameter hole is set to an appropriate size so that the tip of the shaft 2 can be press-fitted.

  In a state where the mold apparatus 10 is opened and the shaft 2 and the intermediate part 3 are accommodated in the cavity of the movable mold 10A as shown in FIG. 3A, the tip of the shaft 2 is a small-diameter hole of the intermediate part 3. It is inserted in front of. In this state, a part of the intermediate part 3 protrudes from the cavity of the movable mold 10A.

  From the state shown in FIG. 3A, the movable platen 20 is moved forward to close the mold apparatus 10. As the mold is closed, the movable mold 10A moves toward the fixed mold 10B, and the end surface of the intermediate part 3 comes into contact with the fixed mold. At this point, the mold closing process ends, and then the process proceeds to a press-fitting process in which the shaft 2 is press-fitted into the intermediate part 3 and coupled. In the press-fitting process, the tip of the shaft 2 is press-fitted into the small diameter hole of the intermediate part 3 by applying a clamping force to the movable mold 10A. As a result, the shaft 2 is coupled to the intermediate part 3. In the press-fitting process, only the mold clamping force necessary for press-fitting is applied to the movable mold 10A, that is, the shaft 2.

  When the shaft 2 is completely press-fitted into the small-diameter hole of the intermediate part 3 by the press-fitting process, the movable mold 10A comes into contact with the fixed mold 10B as shown in FIG. This time corresponds to the normal end of mold closing, and then the mold clamping process is started. When the press-fitting process is completed, a cavity space is formed between the outer peripheral surface of the intermediate part 3 and the inner surface of the cavity.

  When the mold clamping process is completed and a predetermined mold clamping force is applied to the movable mold 10A, as shown in FIG. 3C, the molten resin is filled into the cavity space from the gate 19 to perform molding. When the molten resin is filled, the molten resin is cooled while maintaining the resin pressure for a predetermined time. The cavity space has the same shape as the outer peripheral resin portion 4 of the bearing component 1, and becomes the outer peripheral resin portion 4 when the filled molten resin is cooled and solidified. The molten resin shrinks when solidified, and is in close contact with and fixed to the outer peripheral surface of the intermediate part 4.

  After the pressure holding / cooling process is completed, the mold opening process is started. In the mold opening process, the movable mold 10A is moved backward to open the mold apparatus. When the mold opening is completed, the ejector is driven to advance the ejector pin 42. As a result, the shaft 2 of the bearing component 1 is pushed, and the bearing component 1 molded in the cavity is protruded out of the cavity. The bearing component 1 protruding from the cavity of the movable mold 10A is taken out from the injection molding machine by the take-out machine and carried to the next process.

  According to the above-described insert molding, the center axis (that is, the rotation axis) of the shaft 2 of the bearing component 1 and the center axis (that is, the rotation axis) of the outer peripheral resin portion 4 can be made to coincide with each other with high accuracy. As described above, the outer peripheral resin portion 4 is formed in a state where the rotating shaft 2 of the bearing component 1 is fitted in the through hole 40 of the movable mold 10A. The outer peripheral surface (that is, the rotational sliding surface) of the outer peripheral resin portion 4 is formed by the inner surface of the cavity of the movable mold 10A. Both the through hole 40 and the inner surface of the cavity are circular processed portions having the same center formed in the movable mold 10A, and the centers coincide with each other with high accuracy. In other words, the inner surface of the through-hole 40 (the portion that is shaded in FIG. 3 (a), which becomes the first positioning portion) and the inner surface of the cavity (the portion that is shaded in FIG. 3 (a)), The second positioning portion) can be formed with high positional accuracy. Therefore, if the outer diameter of the shaft 2 is made as close as possible to the inner diameter of the through hole 40 (to the extent that the shaft 2 can be inserted into the through hole 40), the central axis of the shaft 2 (that is, the rotation axis) is the center of the through hole 40. Therefore, it coincides with the center axis (that is, the rotation axis) of the outer peripheral resin portion 4 formed by the inner surface of the cavity with high accuracy.

  Here, for example, when the processing accuracy of the intermediate part 3 into which the shaft 2 is press-fitted is not very good, the central axis related to the outer peripheral surface of the intermediate part 3 and the central axis of the small-diameter hole into which the shaft 2 is press-fit do not coincide with each other. Sometimes. In this case, the rotating shaft of the intermediate part 3 is eccentric with respect to the rotating shaft of the shaft 2. However, even when the central axis of the intermediate component 3 is eccentric with respect to the central axis of the shaft 2 as described above, if the outer peripheral resin portion 4 is molded by the above-described insert molding, the rotational axis of the shaft 2 and the intermediate axis are intermediate. The rotation axis of the outer peripheral resin portion 4 including the component 3 can be made to coincide with the accuracy. Therefore, by using the above-described insert molding, the intermediate part 3 can be manufactured by an inexpensive processing method although the processing accuracy is not so good, and the manufacturing cost of the bearing part 1 can be reduced. Further, since the shaft 2 is press-fitted into the intermediate part 3 using the operation of the mold apparatus 10 (that is, the clamping force applied to the movable mold) when performing insert molding, it is necessary to perform press-fitting work individually. In addition, the number of manufacturing steps of the bearing component 1 can be reduced, and the manufacturing cost can be reduced accordingly.

FIG. 4 is a graph showing the position of the movable mold 10A during the insert molding described above and the detected value of the clamping force in association with each other. In FIG. 4, when the mold closing is started, the position of the movable mold gradually approaches the mold closing position from the mold opening position. On the vertical axis indicating the position of the movable mold, the mold open position when the mold is fully open is L, and the origin 0 is the mold closed position. The process of accommodating the shaft 2 and the intermediate part 3 shown in FIG. 3A in the cavity of the movable mold 10A is performed until the mold closing starts, and the movable mold 10A becomes the fixed mold 10B. When the intermediate part 3 that is close and protrudes from the parting surface of the movable mold 10A comes into contact with the parting surface of the fixed mold 10B, press-fitting of the shaft 2 is started. When the press-fitting is started, the mold clamping force is detected. However, since only the mold clamping force necessary for the press-fitting is generated, the detected value does not increase rapidly. When the press-fitting is completed, as shown in FIG. 3B, the parting surface of the movable mold 10A comes into contact with the parting surface of the fixed mold 10B. At this point in time, pressure increase of the mold clamping force is started, and the detected value of the mold clamping force rapidly increases.

  When the pressurization of the mold clamping force is completed and the mold clamping force reaches a predetermined value, the position of the movable mold 10A becomes zero. The reason why the movable mold position slightly changes between the start of pressurization of the mold clamping force and the completion of pressurization is that the mold apparatus 10 is compressed and slightly deformed by the mold clamping force.

  When the pressurization of the mold clamping force is completed, the resin is filled as shown in FIG. Since the mold clamping force is maintained during the resin filling, the detected value of the mold clamping force is a constant value. Although not shown in FIG. 4, after the resin has been filled, after the resin is solidified, the application of the mold clamping force is released, and the movable mold 10A is retracted and the mold is opened. When the mold opening is completed, the ejector pin 42 is driven as shown in FIG. 3D to take out the bearing component 1 from the movable mold 10.

  As described above, by detecting the mold clamping force in association with the position of the movable mold 10A, it is possible to determine the press-fitted state of the shaft 2 into the intermediate part. For example, if the detected value of the mold clamping force suddenly rises from the start of press-fitting and the detected value of the mold clamping force becomes an abnormally high value at the start of pressurization of the mold clamping force, the press-fitting of the shaft 2 is strong. There is a high possibility that there is a problem that the press-fit is not completely press-fitted or the intermediate part 3 is deformed by press-fitting. On the other hand, if the detected value of the mold clamping force rises gradually from the start of press-fitting and the detected value of the mold clamping force becomes an abnormally low value at the start of pressurization of the mold clamping force, the press-fit of the shaft 2 is too slow. Therefore, there is a high possibility that the shaft 2 is not sufficiently fixed. The detected value of the clamping force at the time when the pressurization of the clamping force is started after the press-fitting is started, and the detected value of the clamping force is above or below a predetermined range (above the upper limit or below the lower limit). In such a case, it is preferable that the bearing part 1 is inspected by determining that there is a high possibility that a defect has occurred in the insert-molded bearing part 1. Alternatively, the mold clamping can be stopped immediately when an abnormality is detected in the detected value of the mold clamping force, and the press-fitting condition of the shaft 2 can be checked. That is, the press-fitting of the shaft 2 can be controlled based on the detected value of the mold clamping force.

  The mold clamping force is detected by a mold clamping force sensor 26 shown in FIG. 2, and the detected value of the mold clamping force is sent to the control unit 28 and used for various controls. However, the detection of the mold clamping force is not limited to the mold clamping force sensor 26, and other sensors may be used. For example, the reaction force of the mold clamping force applied to the movable platen can be detected by a load cell and used as a detected value of the mold clamping force.

  Next, an insert molding method according to another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram showing a process when insert-molding the bearing component 1 by an insert-molding method according to another embodiment of the present invention. In the insert molding method shown in FIG. 5, the shaft 2 of the bearing component 1 is press-fitted into the intermediate component 3 by the ejecting force of the ejector pin 42.

  First, as shown in FIG. 5A, the tip of the shaft 2 is inserted into the through hole 40 opened in the cavity of the movable mold 10A, and then into the center hole of the intermediate part 3 in the cavity. The intermediate part 3 is accommodated in the cavity so that the other end side of the extending shaft 2 is inserted. An ejector pin 42 is inserted into the through hole 40 from the opposite side, and the shaft 2 is stopped in a state where the ejector pin 42 abuts.

  The central hole of the intermediate part 3 is a large-diameter hole having an inner diameter slightly larger than the outer shape of the shaft 2 on the entrance side, and a small-diameter hole having an inner diameter slightly smaller than the outer shape of the shaft 2 on the back side. . The inner diameter of the small-diameter hole is set to an appropriate size so that the tip of the shaft 2 can be press-fitted.

  When the mold apparatus 10 is opened and the shaft 2 and the intermediate part 3 are accommodated in the cavity of the movable mold 10A as shown in FIG. 5A, the tip of the shaft 2 is a small-diameter hole of the intermediate part 3. It is inserted in front of. In this state, the intermediate part 3 is completely accommodated in the cavity of the movable mold 10A, and the end surface of the intermediate part 3 coincides with the parting surface of the movable mold 10A.

  From the state shown in FIG. 5A, the movable platen 20 is moved forward to close the mold apparatus 10. As the mold is closed, the movable mold 10A moves toward the fixed mold 10B, and the parting surface of the movable mold 10A comes into contact with the parting surface of the fixed mold 10B. At this time, the end surface of the intermediate part 3 in the cavity of the movable mold 10A also comes into contact with the parting surface of the fixed mold 10B. When the mold closing process is completed, a cavity space is formed between the outer peripheral surface of the intermediate part 3 and the inner surface of the cavity. When the mold closing is completed, the process proceeds to the mold clamping process. In this embodiment, a predetermined small mold clamping force is first applied instead of applying the mold clamping force rapidly. Then, the press-fitting process is started while maintaining the mold clamping force. In the press-fitting process, the ejector pin 42 is advanced by driving the ejector. Thereby, as shown in FIG. 5B, the shaft 2 arranged on the front side of the ejector pin 42 is press-fitted into the small-diameter hole of the intermediate part 3. The predetermined small mold clamping force described above is a mold clamping force that is applied to fix the movable mold 10A so that the movable mold 10A does not move backward due to pressure input.

  When the shaft 2 is completely press-fitted into the small-diameter hole of the intermediate part 3 by the press-fitting process, the mold clamping force is subsequently increased until it reaches a predetermined value. When the mold clamping process is completed and a predetermined mold clamping force is applied to the movable mold 10A, as shown in FIG. 5C, the molten resin is filled into the cavity space from the gate 19 to perform molding. When the molten resin is filled, the molten resin is cooled while maintaining the resin pressure for a predetermined time. The cavity space has the same shape as the outer peripheral resin portion 4 of the bearing component 1, and becomes the outer peripheral resin portion 4 when the filled molten resin is cooled and solidified. The molten resin shrinks when solidified, and is in close contact with the outer peripheral surface of the intermediate part 4 to be joined.

  After the pressure holding / cooling process is completed, the mold opening process is started. In the mold opening process, the movable mold 10A is moved backward to open the mold apparatus. When mold opening is completed, the ejector is driven to further advance the ejector pin 42. As a result, the shaft 2 of the bearing component 1 is pushed, and the bearing component 1 molded in the cavity is protruded out of the cavity. The bearing component 1 protruding from the cavity of the movable mold 10A is taken out from the injection molding machine by the take-out machine and carried to the next process.

  According to the above-described insert molding, the center axis (that is, the rotation axis) of the shaft 2 of the bearing component 1 and the center axis (that is, the rotation axis) of the outer peripheral resin portion 4 can be made to coincide with each other with high accuracy. As described above, the outer peripheral resin portion 4 is formed in a state where the rotating shaft 2 of the bearing component 1 is fitted in the through hole 40 of the movable mold 10A. The outer peripheral surface (that is, the rotational sliding surface) of the outer peripheral resin portion 4 is formed by the inner surface of the cavity of the movable mold 10A. Both the through hole 40 and the inner surface of the cavity are circular processed portions having the same center formed in the movable mold 10A, and the centers coincide with each other with high accuracy. In other words, the inner surface of the through-hole 40 (the portion that is shaded in FIG. 5A, which is the first positioning portion) and the inner surface of the cavity (the portion that is shaded in FIG. 5A), The second positioning portion) can be formed with high positional accuracy. Therefore, if the outer diameter of the shaft 2 is made as close as possible to the inner diameter of the through hole 40 (to the extent that the shaft 2 can be inserted into the through hole 40), the central axis of the shaft 2 (that is, the rotation axis) is the center of the through hole 40. Therefore, it coincides with the center axis (that is, the rotation axis) of the outer peripheral resin portion 4 formed by the inner surface of the cavity with high accuracy.

  Here, for example, when the processing accuracy of the intermediate part 3 into which the shaft 2 is press-fitted is not very good, the central axis related to the outer peripheral surface of the intermediate part 3 and the central axis of the small-diameter hole into which the shaft 2 is press-fit do not coincide with each other. Sometimes. In this case, the rotating shaft of the intermediate part 3 is eccentric with respect to the rotating shaft of the shaft 2. However, even when the central axis of the intermediate component 3 is eccentric with respect to the central axis of the shaft 2 as described above, if the outer peripheral resin portion 4 is molded by the above-described insert molding, the rotational axis of the shaft 2 and the intermediate axis are intermediate. The rotation axis of the outer peripheral resin portion 4 including the component 3 can be made to coincide with the accuracy. Therefore, by using the above-described insert molding, the intermediate part 3 can be manufactured by an inexpensive processing method although the processing accuracy is not so good, and the manufacturing cost of the bearing part 1 can be reduced. Further, since the shaft 2 is press-fitted into the intermediate part 3 by using the operation of the ejector ejector pin 42 (that is, the ejecting force of the ejector) at the time of insert molding, there is no need to perform press-fitting work individually, and bearing parts The number of manufacturing steps of 1 can be reduced, and the manufacturing cost can be reduced accordingly.

It is sectional drawing of a bearing component. It is sectional drawing of the metal mold | die apparatus for performing insert molding by the insert molding method by embodiment of this invention. It is a figure which shows the process of insert molding by one Embodiment of this invention. It is a graph which correlates and shows the position of the movable metal mold | die in insert molding, and the detected value of clamping force. It is a figure which shows the process of insert molding by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing parts 2 Shafts 3 Intermediate parts 4 Outer peripheral resin part 5 Bearing support body 6 Rotating shaft 10 Mold apparatus 10A Movable mold 10B Fixed mold 15 Extrusion rod 18 Runner 19 Gate 20 Movable platen 22 Fixed platen 24 Tie bar 26 Clamp sensor 30 Heating cylinder 31 Nozzle 40 Through hole 42 Ejector pin

Claims (5)

Placing a first part within a cavity of a mold apparatus and placing a second part with a portion to which the first part is coupled to the first part;
Pressing the first part toward the second part to couple the first part to the second part;
A resin part is injection molded around the second part ,
An insert molding method comprising: determining a coupling state of the first part to the second part based on a detection value of a mold clamping force detector . The insert molding method according to claim 1,
An insert molding method characterized in that coupling of the first part to the second part is controlled by a detection value of a mold clamping force detector . The insert molding method according to claim 1 or 2 ,
The cavity of the mold apparatus has a first positioning part, and the first component is disposed on the first positioning part;
The cavity further includes a second positioning portion corresponding to the first positioning portion, and an outer surface of the resin portion is formed by the second positioning portion. The insert molding method according to any one of claims 1 to 3 ,
The insert molding method according to claim 1, wherein the first part is joined to the second part by a clamping force. The insert molding method according to any one of claims 1 to 4 ,
The insert molding method according to claim 1, wherein the first part is joined to the second part by an ejecting force of an ejector.

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