JP2016120627A - Nut fitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut fitting device capable of improving robust property during fitting, and surely fitting a nut.SOLUTION: A head 100 which absorbs an insert nut N is moved toward the vicinity of a mold side magnet 152, and the insert nut N is fitted to a nut fitting part 150, in a nut fitting device. The nut fitting device comprises: a first case 10 for storing a head side magnet 40 therein; a magnetism release spring 60 for energizing the head side magnet 40 toward the insert nut N side absorbed to the head side magnet 40; a head side pin 50 for, when the head 100 is pressed against the nut fitting part 150, releasing the absorption state of the insert nut N by the heat side magnet 40; a second case 20 for storing the first case 10 therein; and a floating spring 70 for energizing the first case 10 toward a direction equal to the energization direction of the head side magnet 40 by the magnetism release spring 60.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technology of a nut attachment device.

  Insert molding is known as a molding method in which a resin is injected around a metal part inserted into a mold and the metal and the resin are integrated. A nut (insert nut) that is inserted into a mold and integrated with a resin injected into the mold by insert molding is also known.

  In insert molding, the insert nut is insert-molded by closing the mold with the insert nut fitted to the pin provided on the molding surface of the mold cavity, and injecting and filling the resin into the cavity. The product is molded.

  As a device for attaching the insert nut to the mold, the magnetic insert nut is adsorbed by the device side magnet, and the insert nut is close to the mold side magnet provided at the predetermined mounting position on the molding surface of the mold cavity. There is a known nut mounting device that transfers and releases the nut from the device-side magnet and attaches the nut to a predetermined mounting position on the molding surface of the cavity by adsorbing the nut to the mold-side magnet (for example, Patent Document 1).

  Below, the head 200 with which the conventional nut attachment apparatus for attaching the insert nut represented by patent document 1 to a nut attaching part is demonstrated.

The configuration and operation of the head 200 will be described with reference to FIG.
5A to 5C schematically show a mounting process of mounting the insert nut N to the nut mounting portion 150 using the head 200 in a partial cross-sectional view.

  Moreover, the insert nut N is attached to the nut attachment part 150 in order of FIG. 5 (A), FIG. 5 (B), and FIG. 5 (C). In the following, description will be made in accordance with the proximal end side or the distal end side in the axial direction shown in FIG.

  The head 200 includes a case 210, a head-side magnet 240, a head-side pin 250, and a demagnetizing spring 260.

  The case 210 is formed in a substantially cylindrical shape, and houses the head-side magnet 240, the head-side pin 250, and the demagnetizing spring 260 therein. The front end side of the case 210 (the lower side in the drawing in FIG. 5) is configured such that the insert nut N is fitted therein.

  More specifically, in the case 210, a demagnetizing spring 260, a head-side pin 250, and a head-side magnet 240 are accommodated in order from the base end side (the upper side in FIG. 5) to the front end side. An insert nut N is fitted to the tip side of the head side magnet 240 in the case 210. The insert nut N fitted in the case 210 is attracted to the head side magnet 240. The base end side of the case 210 is supported by a moving device (not shown).

  The head-side pin 250 guides the insert nut N to the mold-side pin 152 of the nut attachment portion 150 when the insert nut N is attached to the nut attachment portion 150 using the head 200. The head-side pin 250 includes a main body 251 and a pin portion 252 that protrudes from the main body 251 to the distal end side.

  The head-side magnet 240 is a magnet that attracts the insert nut N. The head-side magnet 240 is formed in a ring shape, and is fixed in a state where the head-side magnet 250 is fitted and inserted into the pin portion 252 on the distal end side of the main body 251 of the head-side pin 250. The pin portion 252 protrudes to the tip side from the head side magnet 240.

  The main body 251 is formed in a cylindrical shape and is urged toward the distal end side of the case 210 by a demagnetizing spring 260 disposed on the proximal end side. The pin portion 252 is formed in a cylindrical shape having a smaller diameter than the main body 251.

  The demagnetizing spring 260 is housed inside the case 210 and urges the head side pin 250 from the base end side of the case 210 toward the front end side.

  The nut attachment portion 150 is provided on the molding surface of a mold (not shown) and is a place where the insert nut N is attached. The nut attachment portion 150 is provided in a nested manner in the mold. The nut mounting portion 150 includes a mold side pin 152 and a mold side magnet 151.

  The mold side pin 152 is a part through which the insert nut N is inserted when the insert nut N is attached to the nut attaching portion 150. The die-side magnet 151 is a magnet that attracts the insert nut N when the insert nut N is attached to the nut attaching portion 150, and is inserted into the base end portion (lower end portion in FIG. 5) of the die-side pin 152. It is fixed in the state.

The operation of the head 200 will be described.
As shown in FIG. 5A, an insert nut N is adsorbed on the tip side of the head 200. At this time, the insert nut N is attracted to the head-side magnet 240 of the head 200. The head side pin 250 is biased by the demagnetizing spring 260 and moved to the tip end side of the head 200.

  The head 200 is brought close to the nut mounting portion 150 by the moving device in a state where the insert nut N is adsorbed.

  As shown in FIG. 5B, the head 200 is moved (pressed) toward the nut mounting portion 150 by the moving device. At this time, the insert nut N is inserted into the mold side pin 152, the pin portion 252 of the head side pin 250 is brought into contact with the mold side pin 152, and the demagnetizing spring 260 is compressed by the head side pin 250. The side magnet 240 and the insert nut N are separated from each other.

  By separating the head-side magnet 240 and the insert nut N, the insert nut N is released from the attracted state by the head-side magnet 240, and the insert nut N is attracted to the mold-side magnet 151 and is attached to the nut mounting portion 150. It is attached.

  However, the gap between the insert nut N and the mold side magnet 151 when the insert nut N is attached to the nut attachment portion 150 is large due to the dimensional tolerance of the mold or the variation in the amount of movement of the head 200 by the moving device. Therefore, the insert nut N may not be attracted to the mold-side magnet 151.

  In particular, when the insert nut N is attached to the upper nut attaching portion 150 by the head 200 from below, if the mold temperature is high and the magnetic force of the mold-side magnet 151 is reduced, the insert nut N is placed on the mold side. In many cases, the magnet 151 is not attracted.

  On the other hand, in order to eliminate the gap between the insert nut N and the mold side magnet 151, when the head 200 is moved toward the tip side by a distance slightly longer than the distance to the actual nut mounting portion 150, the head 200 or There is a possibility that the nut attaching part 150 may be damaged.

  Further, when the insert nut N is attached, if the head 200 is displaced laterally due to operation variation of the moving device, the head 200 is pressed in an unreasonable posture inclined with respect to the nut attachment portion 150. There is a possibility that the head 200 or the nut mounting portion 150 may be damaged.

  As shown in FIG. 5C, when the insert nut N is not attracted to the mold side magnet 151, the head side magnet 240 attracts the insert nut N when the head 200 is separated from the nut mounting portion 150. The insert nut N cannot be attached to the nut attaching portion 150.

  That is, in the head 200, when the insert nut N is attached, the insert nut N is securely attached to the nut attaching portion 150 because the robustness that can absorb the dimensional tolerance of the mold and the variation in the amount of movement by the moving device is low. I can't.

JP 2012-232430 A

  The problem to be solved by the present invention is to provide a nut attachment device capable of improving robustness when attaching a nut to a nut attachment portion by means of a nut attachment device and capable of reliably attaching the nut.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the head is configured to be movable by a moving device and includes a device-side magnet capable of attracting a magnetic nut, and the head that has attracted the magnetic nut by the device-side magnet, The moving device moves to the vicinity of the mold side magnet provided at a predetermined mounting portion of the molding surface of the mold cavity, releases the nut from the attracted state by the apparatus side magnet, and moves to the mold side. A nut mounting device for attaching the nut to the mounting portion by adsorbing the magnet to the mounting portion, wherein the first cylindrical member that houses the device-side magnet therein, and the device-side magnet as the first cylindrical member On the other hand, the first elastic member that urges toward the nut side attracted by the device-side magnet, and the urging of the first elastic member when the head is pressed against the mounting portion. A demagnetizing tool that releases the attracted state of the nut by the device-side magnet, a second cylindrical member that houses the first cylindrical member, and the first cylindrical member, the second cylindrical member On the other hand, a second elastic member for urging in the same direction as the urging direction of the device-side magnet by the first elastic member is provided.

  According to the nut attachment device of the present invention, robustness at the time of attachment can be improved, and the nut can be attached securely.

The schematic diagram which shows the structure and effect | action of an insert molding apparatus. Side surface sectional drawing which shows the structure of a head. FIG. 3 is a schematic diagram showing the action of a head. FIG. 6 is a schematic diagram showing another operation of the head. FIG. 6 is a schematic diagram showing the operation of a conventional head.

The configuration and operation of the insert molding device 500 will be described with reference to FIG.
1 (A) and 1 (B), the configuration and operation of the insert molding device 500 are schematically shown in partial cross-sectional view in the order of the steps of insert molding in the order of FIGS. 1 (A) and 1 (B). Represents.

The configuration of the insert molding device 500 will be described.
An insert molding apparatus 500 shown in FIG. 1 is a molding apparatus that injects and fills resin R around an insert nut N attached to a mold (a fixed mold 110 and a movable mold 120) to integrate the insert nut N and the resin R. (See FIG. 1B), and includes a nut attachment device according to the present invention.

  The nut attachment device includes a head 100 that is an attachment for attaching the insert nut N to the mold, and a moving device for moving the head 100. The head 100 is an embodiment of a head that constitutes a nut attachment device according to the present invention.

  The insert nut N is an embodiment according to the nut of the present invention. The insert nut N of the present embodiment is a magnetic nut.

  As shown in FIG. 1A, the insert molding apparatus 500 includes a fixed mold 110, a movable mold 120, and a laying jig 130.

  A molding surface for forming the cavity C is formed on the upper part of the fixed mold 110. A molding surface for forming the cavity C is formed inside the movable mold 120. Nuts mounting portions 150 as a plurality of mounting portions are provided on the molding surfaces of the fixed mold 110 and the movable mold 120. The configuration of the nut attaching part 150 will be described later in detail.

  The laying jig 130 is disposed between the fixed mold 110 and the movable mold 120 which are separated at a predetermined interval. The laying jig 130 includes a plurality of support portions 131, a base 135, a plurality of heads 100 constituting a nut attachment device, and a moving device for the head 100.

  The support part 131 is disposed via a contact surface (a surface that is not a molding surface) between the fixed mold 110 and the movable mold 120 and supports the base 135.

  The head 100 is an attachment tool for attaching the insert nut N to the nut attachment portion 150. The head 100 is supported by the base 135, and is configured to be movable toward the nut mounting portion 150 of the fixed mold 110 or the movable mold 120 by a moving device (not shown) provided on the base 135, for example. Details of the configuration of the head 100 will be described later.

The operation of the insert molding device 500 will be described.
As shown in FIG. 1 (A), in the insert molding apparatus 500, a laying jig 130 is disposed between the fixed mold 110 and the movable mold 120 in a state where the fixed mold 110 and the movable mold 120 are separated from each other. Each head 100 is moved toward the nut attaching portion 150 by the moving device, and the insert nut N adsorbed by each head 100 is attached to the nut attaching portion 150.

  As shown in FIG. 1 (B), in the insert molding apparatus 500, after the insert nut N is attached to the nut attaching portion 150, the laying jig 130 is removed from between the fixed mold 110 and the movable mold 120, and fixed. The mold 110 and the movable mold 120 are clamped.

  Further, the resin R is injected and filled in the cavity C formed by the clamped fixed mold 110 and the movable mold 120 in a state where the insert nut N is mounted on the nut mounting portion 150, and the insert molded product is molded. Is done.

The configuration of the head 100 will be described with reference to FIG.
In FIG. 2, the configuration of the head 100 is schematically shown in partial cross-sectional view. In the following, description will be made in accordance with the proximal end side or the distal end side in the axial direction shown in FIG.

  The head 100 is an embodiment according to the nut attachment device of the present invention. The head 100 is an attachment for attaching the insert nut N to the nut attachment portion 150 as described above.

  The head 100 includes a first case 10 as a first cylindrical member, a second case 20 as a second cylindrical member, a third case 30 as a third cylindrical member, and a head-side magnet 40 as a device-side magnet. The head side pin 50 as a demagnetizing tool, the demagnetizing spring 60 as a first elastic member, and the floating spring 70 as a second elastic member are provided.

  A first case 10 as a first cylindrical member is formed in a substantially cylindrical shape with a proximal end closed, and houses a head-side magnet 40, a head-side pin 50, and a demagnetizing spring 60 therein. In the first case 10, the demagnetizing spring 60, the head-side pin 50, and the head-side magnet 40 are arranged in this order from the proximal end side toward the distal end side.

  A rod 11 extending from the proximal end of the first case 10 toward the proximal end is provided at the proximal end of the first case 10. Further, a pin sliding portion 12 into which the tip end portion of the head side pin 50 is slidably inserted is formed at the tip side end portion of the first case 10.

  A large diameter portion 13 having a larger diameter than the rod 11 is formed in the middle of the rod 11. The pin sliding portion 12 is formed by reducing the inner diameter of the first case 10 in the middle of the first case 10. The pin sliding portion 12 is formed on the tip side of the head side magnet 40, and a pin portion 52 of a head side pin 50 described later is slidably inserted into the pin sliding portion 12.

  An insert nut N is configured to be fitted on the front end side of the pin sliding portion 12 of the first case 10. More specifically, an insert nut N is fitted to the distal end side of the pin sliding portion 12 in the first case 10. The insert nut N fitted in the first case 10 is attracted to the head-side magnet 40.

  The head-side pin 50 as a demagnetizing tool guides the insert nut N to the mold-side pin 152 of the nut attachment portion 150 when the insert nut N is attached to the nut attachment portion 150 using the head 100. The head-side pin 50 includes a main body 51 and a pin portion 52 that protrudes from the main body 51 toward the distal end side.

  The head-side magnet 40 as the device-side magnet is a magnet that attracts the insert nut N. The head-side magnet 40 is formed in a ring shape, and is fixed in a state where the head-side pin 50 is fitted and inserted into the pin portion 52 on the distal end side of the body 51 of the head-side pin 50. The pin portion 52 protrudes to the tip side from the head side magnet 40 and penetrates the pin sliding portion 12. The pin part 52 protrudes to the tip side from the pin sliding part 12.

  The main body 51 is formed in a cylindrical shape and is urged toward the distal end side of the first case 10 by a demagnetizing spring 60 disposed on the proximal end side. The pin portion 52 is formed in a cylindrical shape having a smaller diameter than the main body 51 and is slidably inserted into the pin sliding portion 12.

  The second case 20 as the second cylindrical member is formed in a substantially cylindrical shape, and houses the first case 10 and the floating spring 70 therein. The floating spring 70 is disposed closer to the base end side than the first case 10. A rod sliding portion 21 in which the inner diameter of the second case 20 is smaller than the other portion is formed at the base end side end portion of the second case 20. The rod 11 is slidably inserted into the rod sliding portion 21.

  The third case 30 as the third cylindrical member is formed in a substantially cylindrical shape, and the second case 20 is attached to the end portion on the front end side. At the distal end side of the third case 30, the base end side end of the second case 20 is in a state where a slight gap is formed between the inner peripheral surface of the third case 30 and the outer peripheral surface of the second case 20. Three cases 30 are supported.

  In the present embodiment, the gap between the inner peripheral surface of the third case 30 and the outer peripheral surface of the second case 20 is φ0.5 to φ1 mm, but the present invention is not limited to this.

  The rotation of the third case 30 and the second case 20 around the relative axis is restricted by the brake pin 32. The base end side end of the third case 30 is supported by a moving device (not shown).

  The demagnetizing spring 60 as the first elastic member is housed inside the first case 10 and biases the head side pin 50 from the proximal end side of the first case 10 toward the distal end side. That is, the demagnetizing spring 60 urges the head side magnet 40 toward the insert nut N side attracted to the head side magnet 40.

  The floating spring 70 as the second elastic member is housed in the second case 20 and biases the first case 10 from the proximal end side to the distal end side of the second case 20. That is, the biasing direction of the head-side magnet 40 by the demagnetizing spring 60 and the biasing direction of the first case 10 by the floating spring 70 are the same.

  The nut attaching part 150 as an attaching part is provided on the molding surface of the fixed mold 110 and the movable mold 120 and is a place where the insert nut N is attached. The nut attaching part 150 is provided in a nested manner in the fixed mold 110 and the movable mold 120. The nut attaching part 150 includes a mold side pin 152 as a mold side pin member and a mold side magnet 151 as a mold side magnet.

  The mold side pin 152 is inserted through the insert nut N when the insert nut N is attached to the molding surfaces of the fixed mold 110 and the movable mold 120. The mold-side magnet 151 is a magnet that attracts the insert nut N when the insert nut N is attached to the nut attachment portion 150 by the head 100.

The operation of the head 100 will be described with reference to FIG.
3A to 3D schematically show a mounting process of mounting the insert nut N to the nut mounting portion 150 using the head 100 in a partial cross-sectional view.

  The insert nut N is attached to the nut attachment portion 150 in the order of FIGS. 3 (A), 3 (B), 3 (C), and 3 (D). In the following, description will be made in accordance with the proximal end side or the distal end side in the axial direction shown in FIG.

  As shown in FIG. 3A, the insert nut N is attracted by the head-side magnet 40 at the tip end side of the head 100. At this time, the insert nut N is attracted to the head-side magnet 40 of the head 100.

  Further, the head side pin 50 is biased by the demagnetizing spring 60 and moved to the tip end side of the head 100. Then, the head 100 is brought close to the nut mounting portion 150 in a state where the insert nut N is adsorbed.

  As shown in FIG. 3B, the head 100 is moved (pressed) toward the nut mounting portion 150 by the moving device. In addition, the head 100 is pressed toward the tip side so that the insert nut N is pressed against the mold side magnet 151 so that there is no gap and is surely attracted to the mold side magnet 151. It moves by a distance slightly longer than the distance to the attachment part 150.

  That is, the head 100 is further moved to the tip side by a slight distance after the insert nut N is moved to a position where it abuts against the mold side magnet 151.

  At this time, the insert nut N is inserted into the mold side pin 152, the pin portion 52 of the head side pin 50 is brought into contact with the mold side pin 152, and the demagnetizing spring 60 is compressed by the head side pin 50. The side magnet 40 and the insert nut N are separated from each other.

  When the head side magnet 40 and the insert nut N are separated from each other, the insert nut N is released from the attracted state by the head side magnet 40, and the insert nut N is attracted to the mold side magnet 151 and is attached to the nut mounting portion 150. It is attached.

  As described above, the head-side pin 50 moves the head-side magnet 40 away from the insert nut N against the urging force of the demagnetizing spring 60 when the head 100 is pressed against the nut mounting portion 150. The insert nut N has a function as a demagnetizing tool that releases the attracted state by the head-side magnet 40.

  As shown in FIG. 3C, since the head 100 moves toward the tip side by a distance slightly longer than the distance to the actual nut mounting portion 150, the insert nut N is a mold of the nut mounting portion 150. From the state in contact with the side magnet 151, the head 100 further moves toward the nut attachment portion 150 side (tip side).

  At this time, the floating spring 70 is compressed by the first case 10. In other words, an excessive amount of movement of the head 100 toward the tip side is absorbed by the floating spring 70.

  Thus, by compressing the floating spring 70, the first case 10 is urged to the tip side by the floating spring 70, and the insert nut N is pressed against the mold side magnet 151, so that the mold side magnet is surely secured. 151 will be absorbed.

  As shown in FIG. 3D, the head 100 is separated from the nut mounting portion 150 in a state where the insert nut N is attracted to the mold side magnet 151 and the insert nut N is mounted to the nut mounting portion 150. The insert nut N is attached to the nut attaching portion 150.

Another operation of the head 100 will be described with reference to FIG.
In FIG. 4, another action of the head 100 is schematically shown in a partial cross-sectional view in the order of FIGS. 4A and 4B.

  As shown in FIG. 4A, the head 100 is moved toward the nut mounting portion 150 by the moving device.

  At this time, the insert nut N is fitted into the mold side pin 152, the pin portion 52 of the head side pin 50 is brought into contact with the mold side pin 152, and the demagnetizing spring 60 is compressed by the head side pin 50. Thus, the head-side magnet 40 and the insert nut N are separated from each other, the insert nut N is attracted to the mold-side magnet 151, and the insert nut N is attached to the nut attachment portion 150.

  As shown in FIG. 4B, due to operation variations of the moving device, the head 100 is in one of the directions intersecting the axial direction with respect to the nut mounting portion 150 (on the right side as viewed in FIG. 4B). It is assumed that the head 100 is pressed against the nut mounting portion 150 in a shifted state.

  At this time, since the second case 20 is supported in the third case 30 with a slight gap formed between the inner peripheral side of the third case 30 and the outer peripheral side of the second case 20, the third case 30 The case 30 and the second case 20 are inclined relative to the axial direction. In this case, the insert nut N attached to the head 100 is inserted into the mold side pin 152 along the axial direction, and only the third case 30 is inclined from the axial direction.

  That is, the shift in the lateral direction (direction intersecting the axial direction) with respect to the nut mounting portion 150 of the head 100 is absorbed by the gap between the second case 20 and the third case 30.

The effect of the head 100 will be described.
According to the head 100, the robustness at the time of attachment can be improved, and the insert nut N can be reliably attached to the nut attachment portion 150.

  That is, according to the head 100, it is possible to absorb an excessive amount of movement of the head 100 by the floating spring 70 and improve the robustness when the insert nut N is attached.

  Further, according to the head 100, a slight gap is formed between the inner peripheral side of the third case 30 and the outer peripheral side of the second case 20, thereby absorbing the positional deviation of the head 100 with respect to the nut mounting portion 150, The robustness when attaching the nut N can be improved.

10 First case (first cylindrical member)
20 Second case (second cylindrical member)
30 Third case (third cylindrical member)
40 Head side magnet (device side magnet)
50 Head side pin (Demagnetizer)
51 Body 52 Pin 60 60 Demagnetizing spring (first elastic member)
70 Floating spring (second elastic member)
100 head 150 nut mounting part (predetermined mounting part)
151 Mold side magnet (mold side magnet)
152 Mold side pin (mold side pin member)

Claims (1)

It is configured to be movable by a moving device, and includes a head having a device-side magnet capable of attracting a magnetic nut.
The head, which has attracted the magnetic nut by the device side magnet, is moved by the moving device to the vicinity of the mold side magnet provided at a predetermined mounting portion of the molding surface of the mold cavity, and the nut is moved. A nut attachment device for attaching the nut to the attachment portion by releasing the adsorption state by the device-side magnet and attracting the mold-side magnet,
A first cylindrical member that houses the device-side magnet therein;
A first elastic member for urging the device-side magnet toward the nut side attracted to the device-side magnet with respect to the first cylindrical member;
A demagnetizing tool that releases the attracted state of the nut by the device-side magnet against the urging force of the first elastic member when the head is pressed against the mounting portion;
A second cylindrical member that houses the first cylindrical member therein;
A second elastic member that urges the first cylindrical member in the same direction as the urging direction of the apparatus-side magnet by the first elastic member with respect to the second cylindrical member;
Comprising
Nut mounting device.

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