JP5050877B2 - Set frame distortion measurement method - Google Patents

Description

  The present invention relates to a distortion measurement method for a set frame used mainly for setting a seat cover of a vehicle seat on a seat pad mold.

A technique for setting a seat cover of a vehicle seat in a molding die is disclosed in Patent Document 1, for example. In this technique, a set frame (support frame) is used when a seat cover is set on a lower mold of a mold for foam-molding a seat pad. The support frame is mounted on the lower mold of the mold and has a function for positioning the seat cover along the molding surface of the lower mold.
In general sheet molding, the seat cover is positioned in the lower mold and the upper and lower molds of the mold are clamped. The seat pad is formed by foaming by filling a foamed resin material. As a result, the foam-molded seat pads are bonded to the inner surface of the seat cover and integrated with each other. During vacuum suction in the cavity, the joining surface between the peripheral edge of the upper surface of the lower mold and the set frame (support frame) is usually a seal surface.
JP-A-3-288607

  As described above, in order to vacuum-seat the seat cover during foam molding of the seat pad, it is important to ensure the sealing property between the lower mold of the molding die and the set frame. However, even if the set frame is distorted to such an extent that the sealing performance at the time of vacuum suction cannot be maintained due to repeated molding operations, it is difficult to visually recognize it. As a result, a set frame that needs to be corrected for distortion is used as it is, vacuum suction inside the cavity is not performed properly, and foam molding of the seat pad becomes poor.

  The present invention is intended to solve such a problem, the purpose of which is to enable confirmation of the suitability of continuous use of the set frame, the mold and the set frame in vacuum suction during foam molding It is to keep the sealing performance between the proper.

The present invention is for achieving the above object, and is configured as follows.
1st invention sets this seat cover to a shaping | molding die, when foam-molding a seat pad in a shaping | molding die, vacuum-sucking the sheet | seat cover set to the shaping | molding die along the shaping | molding surface of this shaping | molding die. This is a set frame distortion measurement method used to detect the contact pressure distribution of the set frame with respect to the measurement mold in a state where the set frame is set in a measurement mold equipped with a pressure sensor. The overall distortion of the set frame is measured based on the pattern.

  As described above, by measuring distortion of the set frame and periodically confirming whether or not the set frame is continuously used, it is possible to always use only an appropriate set frame that has passed the measurement. Thereby, for example, in the vacuum suction at the time of foam molding, the sealing property between the mold and the set frame is always maintained properly, and as a result, good foam molding is maintained.

According to a second invention, in the first invention, the set frame is set on the mold together with the seat cover using a clamp, and is set on the measurement mold in the same manner as the mold using the clamp. To measure distortion.
Thereby, distortion of the set frame can be detected in the same state as when the seat pad is foam-molded in the mold.

According to a third aspect, in the first or second aspect, the distribution of the contact pressure of the set frame detected by the measurement type pressure sensor is displayed as an image of the display device.
As a result, it is possible to confirm the suitability of using the set frame continuously by simply viewing the image on the display device.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
First, the inspection mold 10 used in the inspection process of FIGS. 1 to 3 is for inspecting the sheet cover 30 before moving to the molding process shown in FIGS. The same shape as the lower mold 22 is set. That is, the inspection mold 10 has an inner surface 10 a that is the same shape as the molding surface 22 a of the lower mold 22. Therefore, it is possible to set the sheet cover 30 on the inspection mold 10 in the same state as when the sheet cover 30 is set on the lower mold 22 in the molding process.
The inspection mold 10 has a well-known air decompression structure using a suction pump or the like (not shown) as a drive source so that the space surrounded by the inner surface 10a can be vacuum-sucked.

  The seat cover 30 is set on the inspection mold 10 by the set frame 12 shared by the inspection process and the molding process. The set frame 12 is configured by a combination of an inner frame 14 and an outer frame 15, and an outer peripheral terminal of the seat cover 30 can be sandwiched and held between the both frames 14 and 15. Further, both the frames 14 and 15 have a rectangular frame shape matching the peripheral edges 10 b and 22 b of the upper surface of the inspection mold 10 or the lower mold 22. However, the outer frame 15 may be continuous in the circumferential direction, but the inner frame 14 is divided into a plurality along the circumferential direction.

  As is apparent from FIG. 2, the outer frame 15 of the set frame 12 is constituted by a base portion 15a and a joint portion 15b. The base portion 15a is a portion that contacts the peripheral edges 10b and 22b of the inspection die 10 or the lower die 22, and the joint portion 15b is a portion that faces the inner frame 14 and sandwiches the outer peripheral terminal of the seat cover 30 therebetween. The base portion 15a has a positioning pin 15c for positioning the outer frame 15 by fitting into the hole of the inspection die 10 or the lower die 22. Further, the joining portion 15b has a positioning pin 15d for positioning both the frames 14 and 15 by fitting into the holes of the inner frame 14.

  As shown in FIG. 2, the inner frame 14 and the joint 15b of the outer frame 15 constituting the set frame 12 are held in a coupled state by the two frame clamps 16 at a plurality of locations in the circumferential direction. Furthermore, the base portion 15a of the outer frame 15 is held in a coupled state by outer frame clamps 18 at a plurality of locations in the circumferential direction with respect to the peripheral edges 10b and 22b of the inspection mold 10 or the lower mold 22. As will be described later, both the frame clamps 16 are commonly used in the inspection process and the molding process in the same manner as the set frame 12, but the outer frame clamp 18 is individually provided for each of the inspection process and the molding process. ing. Since both the frame clamp 16 and the outer frame clamp 18 have a well-known structure, only the outline thereof will be described below.

First, the two frame clamps 16 are configured such that the movable plate 16b can be rotated with respect to the fixed plate 16a using the hinge pin 16c as a fulcrum. By rotating the movable plate 16b, the joint portion 15b of the inner frame 14 and the outer frame 15 is held in the coupled state by the fixed plate 16a and the movable plate 16b (FIG. 2), or the coupled state is released. Can do.
The outer frame clamp 18 is connected to a bracket 18a fixed to the peripheral edges 10b, 22b of the inspection mold 10 or the lower mold 22 so that one end of the handle 18b can be rotated. In addition, one end of a pressure arm 18c is rotatably connected to the bracket 18a. The handle 18b and the pressure arm 18c are connected by a link 18d. Accordingly, when the handle 18b is rotated, the base portion 15a of the outer frame 15 is pressed against the peripheral edges 10b and 22b of the inspection mold 10 or the lower mold 22 by the pressure arm 18c interlocked therewith (FIG. 2). Or, the pressing can be released.

In the molding process shown in FIGS. 4 to 6, the molding die 20 (FIG. 6) for foam-molding the seat pad 32 is constituted by a lower die 22 and an upper die 23. As described above, the seat cover 30 can be set to the lower mold 22 by the set frame 12. That is, the base portion 15 a of the outer frame 15 in the set frame 12 can be held in a state of being pressed against the peripheral edge 22 b of the lower mold 22 by the dedicated outer frame clamp 18.
The upper mold 23 can move up and down relative to the lower mold 22. Thus, the mold 20 can be clamped (FIG. 6) or opened, and the foamed resin material is filled into the cavity 26 formed inside the mold 20 in the clamped state, so that the seat pad 32 is formed. Foam molded. In this foam molding, it is necessary to continuously vacuum-suck the seat cover 30 along the molding surface 22a of the lower mold 22. For this purpose, the lower mold 22 side uses a suction pump or the like (not shown) as a drive source. This is a well-known air decompression structure.

The strain measurement system for the set frame 12 shown in FIGS. 7 and 8 includes a measurement mold 40 for measuring the distortion (deformation) of the outer frame 15 constituting the set frame 12. The measuring die 40 is set to have the same shape as the lower die 22 of the forming die 20 similarly to the inspection die 10, and has an inner surface 40a and a peripheral edge 40b having the same shape as the forming surface 22a and the peripheral edge 22b of the lower die 22. However, the inner surface 40a of the measuring die 40 has only a role of determining the set position when the outer frame 15 is set on the measuring die 40 as will be described later, and may be eliminated depending on circumstances.
A pressure sensor 42 is continuously provided in the circumferential direction on the peripheral edge 40 b of the measuring die 40. As is well known, the pressure sensor 42 has a function of detecting pressure applied to itself and converting it into an electric signal. Then, the electrical signal sent from the pressure sensor 42 is displayed as a schematic image of the pressure distribution on the screen of the monitor 44 (display device) shown in FIG. Further, an outer frame clamp 18 having the same configuration as that used in the inspection die 10 or the lower die 22 of the forming die 20 is provided on the peripheral edge 40b of the measuring die 40. With the outer frame clamp 18, the base portion 15 a of the outer frame 15 can be held in a state of being pressed against the pressure sensor 42 of the measurement mold 40.

Subsequently, individual operations in the inspection process of the seat cover 30, the molding process of the seat pad 32, and the distortion measurement system of the set frame 12 will be described.
First, in the inspection process of the seat cover 30, the seat cover 30 is set on the inspection mold 10 by the set frame 12 as described above. At this time, the set frame 12 is joined by both frame clamps 16 with the outer peripheral end of the seat cover 30 sandwiched between the inner frame 14 and the joint 15 b of the outer frame 15. The base portion 15a of the outer frame 15 is held in a state of being pressed against the peripheral edge 10b by a dedicated outer frame clamp 18 provided on the peripheral edge 10b of the inspection die 10.

Therefore, when the sheet cover 30 is vacuumed from the inner surface 10 a side of the inspection mold 10, the sheet cover 30 is adsorbed in a state following the inner surface 10 a of the inspection mold 10. Thereby, it is possible to inspect whether the sealability of the seat cover 30 during vacuum suction is appropriate, and it is possible to inspect the shape of the seat cover 30 for wrinkles due to the sewing line. In the vacuum suction at this time, the joint surface between the peripheral edge 10b of the inspection mold 10 and the base portion 15a of the outer frame 15 in the set frame 12 is a seal surface.
In the inspection process, the seat cover 30 is positioned on the inner surface 10a of the inspection mold 10 using the sewing line as a guide, and the outer peripheral terminals of the seat cover 30 in this state are positioned on the inner frame 14 and the outer frame 15 of the set frame 12. Are joined by the both frame clamps 16. Thereby, the relationship between the set frame 12 and the seat cover 30 is accurately positioned in the inspection process.

When all inspections are completed in the inspection process, the outer frame clamp 18 is released while the both frame clamps 16 of the set frame 12 are left as they are, and the seat cover 30 is removed from the inspection mold 10 together with the set frame 12 (including both frame clamps 16). Remove (Figure 3). And about the sheet | seat cover 30 which passed the test | inspection, it moves to a formation process with the set frame 12. FIG.
In the molding process, the inspected seat cover 30 is set on the lower mold 22 of the molding die 20 by the set frame 12 (FIG. 4). At this time, the base frame 15a of the outer frame 15 in the set frame 12 is held in a state in which it is pressed against the peripheral edge 22b by a dedicated outer frame clamp 18 provided on the peripheral edge 22b of the lower mold 22 to position the set frame 12. (Figure 5). Further, the sheet cover 30 is sucked in a state following the molding surface 22 a of the lower mold 22 by vacuum suction of the sheet cover 30 from the molding surface 22 a side of the lower mold 22. Thus, preparation for foam molding by the mold 20 is completed. In addition, the vacuum suction at this time is such that the joint surface between the peripheral edge 22b of the lower mold 22 and the base portion 15a of the outer frame 15 in the set frame 12 is a seal surface.

  Next, the mold 20 is clamped as shown in FIG. 6, and the foamed resin material is put into the cavity 26 while vacuum-sucking the sheet cover 30 along the molding surface 22a of the lower mold 22 as described above. Fill. As a result, the seat pad 32 is foam-molded inside the seat cover 30 in the cavity 26. After molding, the mold 20 is opened, the set frame 12 is removed from the seat cover 30, and the sheet molded product is taken out from the lower mold 22. In this sheet molded product, a foam-molded seat pad 32 is bonded to the inner surface of the seat cover 30 and integrated with each other.

As described above, in the vacuum suction in the inspection process or the molding process, the peripheral edge 10b of the inspection mold 10 or the peripheral edge 22b of the mold 20 (lower mold 22) and the base portion 15a of the outer frame 15 in the set frame 12 are used. The joint surface becomes a sealing surface. For this reason, in order to keep the sealing performance at the time of vacuum suction properly, the degree of distortion of the outer frame 15 is periodically measured, and if it is appropriate, it can be used continuously. is required.
Therefore, in the strain measurement system shown in FIGS. 7 and 8, the overall distortion of the outer frame 15 of the set frame 12 used in the inspection process and the molding process is measured. For this purpose, the outer frame 15 is placed on the peripheral edge 40 b of the measuring die 40 with the base portion 15 a in contact with the upper surface of the pressure sensor 42. Then, the outer frame clamp 18 of the measuring die 40 holds the base portion 15a of the outer frame 15 in a state of being pressed against the pressure sensor 42 (FIG. 8). That is, the outer frame 15 is set in the measuring die 40 in the same state as when used in the inspection process or the molding process.

  By setting the outer frame 15 to the measurement mold 40 in this way, the contact pressure of the base portion 15a with respect to the pressure sensor 42 is detected by the pressure sensor 42, and based on the detection signal, the monitor shown in FIG. An image of the pressure distribution is schematically displayed at 44. Whether or not the outer frame 15 is subsequently used is determined based on this image. The pressure distribution does not need to be uniform over the entire circumference of the outer frame 15 (base portion 15a), and there is a difference in individual pressure between the location where the outer frame clamp 18 is used and the location where it is not. Of course it will occur. Therefore, whether or not the outer frame 15 is continuously used is determined by determining whether or not the pressure distribution pattern displayed on the monitor 44 is within the range of the normal pattern obtained in advance.

As is clear from the above description, in the foam molding in which the seat cover 30 and the seat pad 32 are integrated, the seat cover 30 has a sealing property during vacuum suction, and the set state of the molding die 20 with respect to the lower die 22 is the seat. It affects the quality of the molded product. On the other hand, if the sealing process is checked for appropriateness and confirmation of the set state in the molding process, a lot of time is spent on preparation work in the molding process.
In the present embodiment, as described above, in the inspection process that is a pre-process of the molding process, it is possible to inspect the shape of the sheet cover 30 and the suitability of the sealability during vacuum suction. Moreover, in this inspection process, the inner surface 10a of the inspection mold 10 is used to position the seat cover 30 assuming the lower mold 22 of the mold 20 in the next molding process, and the set frame 12 and the seat cover 30 are in that state. Can be determined. For these reasons, in the molding process, the preparation of foam molding is completed by simply setting the seat cover 30 transferred together with the set frame 12 from the inspection process to the lower mold 22 of the molding die 20, and the working time in the molding process is shortened. Is done. Further, since the work of setting the seat cover 30 on the lower mold 22 is simplified, the work by the robot is also possible.

Furthermore, in the strain measurement system, for example, every time the number of moldings in the molding process of the seat pad 32 reaches a predetermined number, the strain of the outer frame 15 in the set frame 12 is measured, and the outer frame 15 is used continuously. Check the suitability of Thereby, only the appropriate outer frame 15 can be continuously used. Therefore, in vacuum suction when foaming the seat pad 32 in the molding process, the sealing property between the lower mold 22 and the outer frame 15 of the molding die 20 is always maintained properly, and foam molding is performed well. Further, in this strain measurement system, as described above, the outer frame 15 is set on the measuring die 40 by the outer frame clamp 18 in the same manner as when used in the molding process, so that the distortion of the outer frame 15 is accurately detected. be able to.
Note that the distortion measurement of the outer frame 15 in the distortion measurement system may be performed based on the number of inspections of the sheet cover 30 in the inspection process described above, and it may be determined whether or not the set frame 12 is continuously used. .

Schematic showing the set state of the seat cover in an inspection process. Sectional drawing which expanded and represented the principal part of FIG. Schematic showing the removal state of the seat cover in an inspection process. Schematic showing the seat cover in the middle of the molding process. Schematic showing the set state of the seat cover in a formation process. Sectional drawing which expanded and represented the principal part of FIG. Schematic showing the distortion measurement system of a set frame. Sectional drawing which expanded and represented the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inspection type | mold 12 Set frame 14 Inner frame 15 Outer frame 16 Both frame clamp 18 Outer frame clamp 20 Molding die 22 Lower die 22a Molding surface 30 Seat cover 32 Seat pad 40 Measuring die 42 Pressure sensor 44 Monitor (display device)

Claims (3)

Used to set the seat cover in the molding die when foaming the seat pad in the molding die while vacuum-sucking the seat cover set in the molding die along the molding surface of the molding die. A distortion measurement method for a set frame,
A set that detects the contact pressure distribution of the set frame against this measurement mold and sets the overall distortion of the set frame based on the pressure distribution pattern when the set frame is set on a measurement mold equipped with a pressure sensor. Frame distortion measurement method. The sheet forming method according to claim 1,
A set frame distortion measurement method in which a set frame is set on a mold together with a seat cover using a clamp, and the measurement mold is set using a clamp in the same manner as in the case of the mold. The sheet forming method according to claim 1 or 2,
A set frame distortion measurement method for displaying a set frame contact pressure distribution detected by a measurement type pressure sensor as an image of a display device.

Images