Release force measuring device

Abstract

The object of the present invention is to provide a mold release force measuring device that can efficiently determine the mold release force of each part of a resin molded product with a complex shape. [Solution] The demolding force measuring device comprises a measuring device main body having a hook portion, a tubular member inside which a resin molding is molded, an engaging member having an engaging portion that is partially embedded within the resin molding and engages with the hook portion, a contact portion having an evaluation surface that comes into contact with the resin molding, and an angle adjustment jig that can change the angle of the evaluation surface relative to the direction in which the hook portion is pulled up by the measuring device main body.

Description

[Technical Field]

[0001] The present invention relates to a mold release force measuring device. [Background technology]

[0002] The force required in the demolding process to remove a resin molded product from a mold is called the demolding force. A method for determining the demolding force has been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 63-144234 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to efficiently manufacture resin molded products, it is necessary to set the mold release force within an appropriate range. The mold release force varies depending on, for example, the conditions of the surface treatment of the mold. Therefore, in order to set the mold release force within an appropriate range, it is necessary to repeatedly perform mold release force measurement tests by changing the surface treatment of the mold.

[0005] If such repeated tests were carried out using the same molds as those used in the actual production of the product, the amount of resin used would increase, and the number of steps would increase, resulting in a lot of waste. Furthermore, molds prepared for evaluating one surface treatment cannot be used for evaluating other surface treatments, and are often discarded.

[0006] Furthermore, resin molded products can have complex shapes, and the effects of surface treatments can vary depending on the part of the resin molded product. Figure 1A shows a perspective view of a stator 1, which is part of a motor. The stator 1 has a coil part 3 provided in a stator body 2. A resin part 4 is molded into the coil part 3 to ensure the insulation of the coil part 3. The resin part 4 is one of the resin molded products molded using a mold, and in order to efficiently manufacture the resin part 4, it is possible to measure and evaluate the mold release force when molding the resin part 4.

[0007] When molding the resin portion 4, the mold is relatively removed from the resin portion 4 along the direction of the axis AX of the stator 1. Here, the coil portion 3 covered by the resin portion 4 has a complex shape, and the inner peripheral shape of the mold that molds the resin portion 4 also has a complex shape that imitates the shape of the coil portion 3. Therefore, even if the relative removal direction of the mold is constant along the axis AX, the relationship of the angle between the surface of the resin portion 4 and the axis AX varies depending on the part of the resin portion 4. In other words, the mold release force differs depending on the part of the surface of the resin portion 4 and is not uniform.

[0008] When molding a resin part 4 having a complex shape, it is convenient to know and evaluate the mold release force for each region and part of the resin part 4.

[0009] As described above, evaluation of mold release force is required to reduce the amount of resin used, reduce unnecessary man-hours, avoid discarding molds, and also to accommodate the complex shapes of resin molded products. However, Patent Document 1 does not meet these requirements.

[0010] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a mold release force measuring device that can efficiently measure the mold release force at each part of a resin molded product having a complex shape. [Means for solving the problem]

[0011] The above object is achieved by a demolding force measuring device comprising: a measuring device main body having a hook portion; a tubular member inside which a resin molding is molded; an engaging member having an engaging portion that is partially embedded in the resin molding and engages with the hook portion; a contact portion having an evaluation surface that comes into contact with the resin molding; and an angle adjustment jig that can change the angle of the evaluation surface relative to the direction in which the hook portion is pulled up by the measuring device main body. [Effects of the Invention]

[0012] It is possible to provide a mold release force measuring device that can efficiently determine the mold release force at each part of a resin molded product with a complex shape. [Brief explanation of the drawings]

[0013] [Figure 1] Fig. 1A is a perspective view of a stator equipped with a resin part, and Fig. 1B is a front view of a mold release force measuring device. [Figure 2] Figure 2A is a plan view of the pressure plate, Figure 2B1 is a plan view of the tubular member, Figure 2B2 is a side view of the tubular member, Figure 2C is a plan view of the posture maintaining plate, Figure 2D1 is a front view of the engagement member, Figure 2D2 is a plan view of the engagement member, Figure E is a plan view of the evaluation plate (contact portion), Figure 2F1 is a front view of the resin molded portion, Figure 2F2 is a plan view of the resin molded portion, and Figure 2F3 is a side view of the resin molded portion. [Figure 3] Figure 3A is a cross-sectional view along the axial direction of the resin molded part, Figure 3B1 is a front view of the angle adjustment jig, Figure 3B2 is a side view of the angle adjustment jig, Figure 3C1 is an explanatory diagram showing the state in which the resin molded part is installed in a first installation part of the base part provided on the angle adjustment jig, and Figure 3C2 is an explanatory diagram showing the state in which the resin molded part is installed in a second installation part of the base part provided on the angle adjustment jig. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1B includes a measuring device main body (hereinafter simply referred to as "device main body") 101, a resin molding part 10, and an angle adjusting jig .

[0015] The resin molded part 10 can reproduce the relationship between an actual resin molded product and the mold used to mold it. When an actual resin molded product is removed from a mold, resin may adhere to the inner wall of the mold. Resin adhering to the inner wall of the mold is inherently part of the resin molded product. Therefore, resin adhesion to the inner wall of the mold results in portions of the resin molded product that are thinner than designed. Furthermore, molds are reused repeatedly, and resin adhesion to their inner wall necessitates the removal of the resin, reducing work efficiency. Therefore, surface treatments are performed to coat the inner wall of the mold. There are many different types of coating materials, and it is necessary to select the appropriate coating material and the best application method. The mold release force can be used as an indicator of the quality of the surface treatment. For example, the resin part 4 of the stator 1 shown in Figure 1A is a resin molded product. Because the shape of the resin part 4 is complex, it is difficult to accurately measure the mold release force for each part of the resin part 4, even if an actual mold is used. It is not efficient to evaluate the characteristics of a wide variety of surface treatments using an actual mold. Therefore, by using the measuring device 100 of the embodiment to reproduce the state of each part of the resin part 4 and measure the release force, it is possible to know the release force of each part of the resin part 4. Furthermore, it is possible to efficiently evaluate the characteristics of a wide variety of surface treatments.

[0016] [Measuring equipment] The measuring device 100 includes a device body 101 having a hook portion 101a. The device body 101 hooks the hook portion 101a to an engagement portion 16c (see FIG. 2F1) that is also provided with a portion to be measured for the release force, and the device body 101 measures the release force by pulling up the hook portion 101a. The device body 101 itself is conventionally known, and therefore further description will be omitted.

[0017] [Resin molding part] The resin molded portion 10 includes a retaining plate 11 (see FIGS. 2A and 2F1 to 2F3) for fixing the evaluation plate 30 (see FIGS. 2E and 2F1 to 2F3) to the base portion 53 (see FIG. 3B1, etc.). The resin molded portion 10 includes a cylindrical member 13 (see FIGS. 2B1, 2B2, and 2F1 to 2F3), a posture maintaining plate 14 (see FIGS. 2C and 2F1 to 2F3), and an engaging member 16 (see FIGS. 2D1, 2D2, and 2F1 to 2F3).

[0018] The evaluation plate 30 corresponds to the contact portion, and its surface is the evaluation surface 30a. Various surface treatments are applied to the evaluation surface 30a. By preparing multiple evaluation plates with different surface treatments applied to the evaluation surfaces 30a, the characteristics of the surface treatments can be efficiently evaluated.

[0019] The retaining plate 11 has a positioning hole 11a and a bolt hole 11b for the cylindrical member 13. The positioning hole 11a and the bolt hole 11b are both through holes. As shown in FIGS. 2F1 to 2F3, the retaining plate 11 is placed on top of the evaluation plate 30 which is in close contact with the base portion 53, and is fixed to the base portion 53 with a retaining bolt 12. In this way, the evaluation plate 30 is fixed to the base portion 53. The evaluation plate 30 can be easily replaced by detaching the retaining plate 11.

[0020] The cylindrical member 13 is placed in the positioning hole 11a. At this time, one axial end face of the cylindrical member 13 is in contact with the evaluation surface 30a of the evaluation plate 30. The internal space 13a of the cylindrical member 13 is filled with resin. As a result, a resin molded body 20 is molded inside the cylindrical member 13. The resin molded body 20 solidifies while adhering to the evaluation surface 30a. This state reproduces the relationship between an actual mold and a resin molded product.

[0021] The posture maintaining plate 14 is a member for maintaining the posture of the engaging member 16. The posture maintaining plate 14 is a set of a plate-shaped first member 14a and a plate-shaped second member 14b. The first member 14a has a recess 14a1. The second member 14b has a recess 14b1. The posture maintaining plate 14 has a shaft insertion portion 15 formed by butting together the recess 14a1 and the recess 14b1 in an opposing relationship. A shaft 16a of the engaging member 16, which will be described later, is inserted into the shaft insertion portion 15. The posture maintaining plate 14 is arranged on the other axial end face of the cylindrical member 13, as shown in FIGS. 2F1 to 2F3.

[0022] As shown in FIGS. 2D1 and 2D2 , the engaging member 16 includes a shaft portion 16a, a flange portion 16b, and an engaging portion 16c. The shaft portion 16a is disposed so that its axis is perpendicular to the evaluation surface 30a. The flange portion 16b abuts against the posture maintaining plate 14, thereby maintaining the posture of the engaging member 16 such that the shaft portion 16a is perpendicular to the evaluation surface 30a. The engaging portion 16c is an annular portion that can engage with a hook portion 101a provided in the measuring device 100. The engaging member 16 is disposed such that the shaft portion 16a passes through the shaft insertion portion 15 and is positioned within the internal space 13a of the tubular member 13, and the flange portion 16b abuts against the posture maintaining plate 14. In this state, resin is filled into the internal space 13a of the tubular member 13, thereby embedding the shaft portion 16a in the resin molded body 20. Then, the resin solidifies, thereby integrating the resin molded body 20 and the engaging member 16.

[0023] The resin molded body 20 is solidified with the resin adhering to the evaluation surface 30a. The force required to separate the resin molded body 20 in this adhered state from the evaluation surface 30a corresponds to the demolding force. Therefore, by using the measuring device 100, it is possible to know the demolding force required to remove the resin molded body from the actual mold.

[0024] [Angle adjustment jig] The angle adjustment jig 50 includes a receiving member 51, a swinging member 52, and a base 53. The receiving member 51 includes a curved portion 51a. The curved portion 51a is a hemispherical recess. The swinging member 52 includes a hemispherical portion 52a that protrudes in a shape corresponding to the shape of the curved portion 51a. The swinging member 52 is combined with the receiving member 51 so that the hemispherical portion 52a can slide on the curved portion 51a. By applying a force in the direction indicated by arrow 5b in FIG. 3B1 or arrow 5c in FIG. 3B2, the swinging member 52 can be positioned not only upright relative to the receiving member 51 but also in various tilted positions. The swinging member 52 can be fixed in a desired position after being adjusted. Note that the structure for swinging the swinging member 52 is not limited to this, and a conventionally known structure can be used as is or modified.

[0025] A pedestal portion 53 is provided on the opposite side of the hemispherical portion 52a of the oscillating member 52. The pedestal portion 53 is detachably attached to the oscillating member 52, but may be formed integrally with the oscillating member 52. Referring to FIG. 3B1 , the pedestal portion 53 has a first installation portion 53a and a second installation portion 53b that are L-shaped when viewed from the front. The first installation portion 53a and the second installation portion 53b are portions on which the resin molded portion 10 can be installed. The first installation portion 53a is a portion on which the evaluation plate 30 is installed so that the evaluation surface 30a is horizontal when the oscillating member 52 is in an upright position. The second installation portion 53b is a portion on which the evaluation plate 30 is installed so that the evaluation surface 30a is vertical when the oscillating member 52 is in an upright position.

[0026] 3B1 and 3B2, arrow 5a extends vertically and indicates the direction in which hook portion 101a is pulled up by device main body 101. Angle adjustment jig 50 can change the angle of evaluation surface 30a relative to the direction in which hook portion 101a is pulled up. This makes it possible to reproduce the state of each part of actual resin part 4, and to know the demolding force for each part.

[0027] [Measurement method] First, a plurality of evaluation plates 30 having different surface treatments applied to the evaluation surfaces 30a are prepared, and a resin molded portion 10 is provided on each evaluation plate 30.

[0028] Next, each part of the angle adjusting jig 50 is set so as to reproduce the surface condition of the part of the actual resin part 4 where the demolding force is to be determined, i.e., the angle of that surface relative to the mold removal direction. To set each part, first select whether the resin molding part 10 is to be installed in the first installation part 53a or the second installation part 53b. Then, the attitude of the oscillating member 52 is adjusted. After that, the resin molding part 10 is installed in the selected installation part. The resin molding part 10 may be installed before the attitude of the oscillating member 52 is adjusted.

[0029] After the installation of the resin molding section 10 and the adjustment and fixation of the swinging member 52 are completed, the hook section 101a is engaged with the engaging section 16c of the engaging member 16. Then, the device main body 101 is operated to measure the force when the resin molding 20 is pulled away from the evaluation surface 30a of the evaluation plate 30. The measured force corresponds to the demolding force. Thereafter, the resin molding sections 10 are replaced one by one, and the force is measured using the same procedure. This makes it possible to efficiently determine the demolding force of each part of the resin molding.

[0030] [Effects] The measuring device 100 of this embodiment is equipped with an evaluation plate as a contact portion that comes into contact with the resin molded body, thereby enabling the relationship between the mold and the resin molded product to be reproduced. Furthermore, the measuring device 100 is equipped with an engaging member having an engaging portion that engages with a hook portion provided on the measuring device main body, enabling the operation of relatively removing the resin molded product from the mold to be reproduced. This makes it possible to efficiently determine the mold release force of an actual resin molded product. Furthermore, the measuring device 100 is equipped with an angle adjustment jig, making it possible to handle resin molded products with complex shapes. Furthermore, it is possible to reduce the amount of resin used and the number of steps. Furthermore, it is possible to avoid discarding the actual mold.

[0031] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as defined in the claims. [Explanation of symbols]

[0032] 1... stator, 3... coil portion, 4... resin portion, 10... resin molded portion, 11... retaining plate, 13... cylindrical member, 13a... internal space, 14... attitude maintaining plate, 15... shaft insertion portion, 16... engaging member, 16a... shaft portion, 16b... flange portion, 16c... engaging portion, 20... resin molded body, 30... evaluation plate (contact portion) 30a... evaluation surface, 50... angle adjusting jig, 100... mold release force measuring device, 101... measuring device main body, 101a... hook portion

Claims

[Claim 1] a measuring device body having a hook portion; a cylindrical member in which a resin molded body is molded; an engaging member, a part of which is embedded in the resin molding and which has an engaging portion that engages with the hook portion; a contact portion having an evaluation surface with which the resin molded body comes into contact; an angle adjustment jig that can change the angle of the evaluation surface with respect to the direction in which the hook portion is pulled up by the measuring device main body; A mold release force measuring device equipped with:

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