Demolding force measuring device

Abstract

The purpose of the present invention is to provide a mold release force measurement device capable of efficiently knowing the mold release force of each portion in a resin molded article having a complex shape. The mold release force measuring device includes: a measuring device main body including a hook portion; a cylindrical member in which the resin molded body is molded; an engagement member partially embedded in the resin molded body and provided with an engagement part that engages with the hook part; a contact part having an evaluation surface in contact with the resin molded body; and an angle adjustment jig capable of changing the angle of the evaluation surface with respect to the direction in which the hook is lifted by the measurement device main body.

Description

Technical Field

[0001] This invention relates to a device for measuring demolding force. Background Technology

[0002] The force required for the demolding process, which removes a resin molded article from a mold, is called the demolding force. A method for determining the demolding force has been proposed (see, for example, Patent Document 1). Existing technical documents [Patent Literature]

[0003] Patent Document 1: Japanese Patent Application Publication No. 63-144234 Summary of the Invention The problem that the invention aims to solve

[0004] To efficiently manufacture resin molded articles, the release force needs to be set within a suitable range. The release force can vary, for example, due to changes in the mold surface treatment conditions. Therefore, to set the release force within a suitable range, it is necessary to repeatedly conduct release force measurement tests with variations in mold surface treatment.

[0005] If the same molds used in manufacturing the actual product are used for repeated testing as described above, the amount of resin used will increase, the labor time will increase, and there will be more waste. In addition, molds prepared for evaluating one surface treatment cannot be used for evaluating other surface treatments and will mostly be discarded.

[0006] Furthermore, resin molded articles sometimes have complex shapes, and the surface treatment effect may vary depending on the part of the resin molded article. Figure 1 In (A), a perspective view of a stator 1, which is part of a motor, is shown. The stator 1 includes a coil portion 3 provided on the stator body 2. A resin portion 4 for ensuring the insulation of the coil portion 3 is formed on the coil portion 3. The resin portion 4 is one of the resin molded products formed by molding. In order to manufacture the resin portion 4 efficiently, it is considered to measure and evaluate the demolding force when molding the resin portion 4.

[0007] When the resin part 4 is formed, the mold is pulled out relative to the resin part 4 along the axis AX of the stator 1. Here, the coil part 3 covered by the resin part 4 has a complex shape, and the inner circumference of the mold forming the resin part 4 also has a complex shape that imitates the shape of the coil part 3. Therefore, even though the relative pulling direction of the mold is the axis AX and is constant, the angular relationship between the surface of the resin part 4 and the axis AX varies depending on the location of the resin part 4. That is to say, the demolding force is different depending on the location of the surface of the resin part 4, and is not the same.

[0008] When molding resin part 4 with a complex shape, it is more convenient if the demolding force can be known and evaluated for each area and part of resin part 4.

[0009] As such, evaluating the release force requires reducing the amount of resin used, cutting down on wasted labor time, avoiding mold waste, and addressing the complex shapes of resin molded articles. However, Patent Document 1 fails to meet these requirements.

[0010] Therefore, the object of the present invention is to provide a demolding force measuring device that can efficiently know the demolding force of each part in a resin molded article with a complex shape. Technical means for solving problems

[0011] The above objective is achieved by a demolding force measuring device comprising: a measuring device body having a hook; a cylindrical component for forming a resin molded body inside; a locking component partially embedded in the resin molded body and having a locking portion for engaging with the hook; a contact portion having an evaluation surface that contacts the resin molded body; and an angle adjustment fixture capable of changing the angle of the evaluation surface relative to the direction in which the hook is lifted by the measuring device body. Invention Effects

[0012] A demolding force measuring device can be provided, which can efficiently determine the demolding force of each part in a resin molded article with a complex shape. Attached Figure Description

[0013] Figure 1 (A) is a perspective view of a stator having a resin section. Figure 1 (B) is a front view of the demolding force measuring device. Figure 2 (A) is a top view of the pressure plate. Figure 2 (B1) is a top view of the cylindrical component. Figure 2 (B2) is a side view of the cylindrical component. Figure 2 (C) is a top view of the posture holding board. Figure 2 (D1) is the front view of the engaging component. Figure 2 (D2) is a top view of the engaging components. Figure 2 (E) is a top view of the evaluation plate (contact area). Figure 2 (F1) is a front view of the resin molding section. Figure 2 (F2) is a top view of the resin molding section. Figure 2 (F3) is a side view of the resin molding section. Figure 3 (A) is a cross-sectional view of the resin molding section along the axial direction. Figure 3 (B1) is the front view of the angle adjustment fixture. Figure 3 (B2) is a side view of the angle adjustment fixture. Figure 3(C1) is an explanatory diagram showing that a resin molding part is provided in the first setting part of the base portion of the angle adjustment fixture. Figure 3 (C2) is an explanatory diagram showing that a resin molding part is provided in the second setting part of the base part of the angle adjustment fixture. Detailed Implementation

[0014] (Implementation Method) Figure 1 The demolding force measuring device (hereinafter referred to as the "measuring device") 100 shown in (B) includes a measuring device body (hereinafter referred to as the "device body") 101, a resin molding part 10, and an angle adjustment fixture 50.

[0015] The resin molding section 10 can reproduce the relationship between the actual resin molded article and the mold used to mold it. When the resin molded article is removed from the mold after obtaining the actual resin molded article, resin sometimes adheres to the inner peripheral wall of the mold. The resin adhering to the inner peripheral surface of the mold is originally part of the resin molded article. Therefore, if resin adheres to the inner peripheral surface of the mold, a portion of the resin molded article will be thinner than designed. In addition, although the mold is reused, if resin adheres to its inner peripheral surface, it is necessary to remove the resin, which reduces work efficiency. Therefore, a surface treatment of coating the inner peripheral surface of the mold is performed. There are many types of coating materials, and it is necessary to select the appropriate coating material and the best application method. As an indicator of the quality of surface treatment, the release force can be used. For example, Figure 1 The resin part 4 of the stator 1 shown in (A) is one of the resin molded products. The shape of the resin part 4 is complex, so even when using an actual mold to measure the demolding force, it is difficult to accurately measure the demolding force for each part of the resin part 4. Using an actual mold to evaluate the characteristics of various surface treatments is not efficient. 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 demolding force, the demolding force of each part of the resin part 4 can be known. Furthermore, the characteristics of various surface treatments can be evaluated efficiently.

[0016] [Measuring Apparatus] The measuring device 100 includes a main body 101 with a hook 101a. The main body 101 engages the hook 101a with a locking portion 16c (see reference 16c), which is also provided on the part of the object to be measured for the demolding force. Figure 2 The device (F1) is used to lift the hook 101a to measure the demolding force. The main body 101 of the device itself is known in the past, so further explanation is omitted.

[0017] [Resin Molding Section] The resin molding section 10 is equipped with a method for molding the evaluation plate 30 (see reference) Figure 2 (E) Figure 2 (F1) to Figure 2 (F3) is fixed to the base portion 53 (see reference). Figure 3 (B1) etc.) pressure plate 11 (refer to Figure 2 (A) Figure 2 (F1) to Figure 2 (F3)). The resin molding part 10 has a cylindrical component 13 (see reference). Figure 2 (B1) Figure 2 (B2) Figure 2 (F1) to Figure 2 (F3)), Posture holding plate 14 (refer to) Figure 2 (C) Figure 2 (F1) to Figure 2 (F3)) and engaging component 16 (see reference) Figure 2 (D1) Figure 2 (D2) Figure 2 (F1) to Figure 2 (F3)).

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

[0019] The pressure plate 11 has a positioning hole 11a and a bolt hole 11b in the cylindrical component 13. Both the positioning hole 11a and the bolt hole 11b are through holes. The pressure plate 11 is as follows: Figure 2 (F1) to Figure 2 As shown in (F3), the evaluation plate 30, which is overlapped and tightly attached to the base portion 53, is fixed to the base portion 53 by pressing the bolt 12. Thus, the evaluation plate 30 is fixed to the base portion 53. The evaluation plate 30 can be easily replaced by removing and attaching the pressure plate 11.

[0020] A cylindrical component 13 is disposed within the positioning hole 11a. At this time, one end face of the cylindrical component 13 in the axial direction is in contact with the evaluation surface 30a of the evaluation plate 30. Resin is filled into the internal space 13a of the cylindrical component 13. As a result, a resin molded body 20 is formed inside the cylindrical component 13. The resin molded body 20 is cured while in close contact with the evaluation surface 30a. This state reproduces the relationship between the actual mold and the resin molded article.

[0021] The posture holding plate 14 is a component used to maintain the posture of the engaging member 16. The posture holding plate 14 is a combination of a first plate-shaped component 14a and a second plate-shaped component 14b. The first component 14a has a recess 14a1. The second component 14b has a recess 14b1. The posture holding plate 14 has a shaft insertion portion 15 formed by aligning and engaging the recesses 14a1 and 14b1. The shaft portion 16a of the engaging member 16, which will be described later, is inserted into the shaft insertion portion 15. Figure 2 (F1) to Figure 2 As shown in (F3), the posture holding plate 14 is disposed on the opposite end face of the cylindrical member 13 in the axial direction.

[0022] like Figure 2 (D1) and Figure 2 As shown in (D2), the engaging member 16 includes a shaft portion 16a, a flange portion 16b, and an engaging portion 16c. The shaft portion 16a is arranged perpendicular to the evaluation surface 30a with its axial direction perpendicular to it. The flange portion 16b abuts against the posture holding plate 14, thereby maintaining the posture of the engaging member 16 with the shaft portion 16a perpendicular to the evaluation surface 30a. The engaging portion 16c is an annular portion that can engage with the hook portion 101a provided by the measuring device 100. The engaging member 16 is arranged with the shaft portion 16a passing through the shaft insertion portion 15 and located within the internal space 13a of the cylindrical member 13, and the flange portion 16b abutting against the posture holding plate 14. In this state, the shaft portion 16a is embedded in the resin molded body 20 by filling the internal space 13a of the cylindrical member 13 with resin. Then, the resin molded body 20 and the engaging member 16 are integrated by the curing of the resin.

[0023] The resin molded body 20 is cured while the resin is fixed to the evaluation surface 30a. The force required to pull the resin molded body 20, which is in this fixed state, away from the evaluation surface 30a is equivalent to the demolding force. Therefore, by using the measuring device 100, the demolding force required to remove the resin molded article from the actual mold can be determined.

[0024] [Angle Adjustment Fixture] The angle adjustment fixture 50 includes a support member 51, a swing member 52, and a base portion 53. The support member 51 has a curved portion 51a, which is a hemispherical concave portion. The swing member 52 has a hemispherical portion 52a, which protrudes in a shape corresponding to the shape of the curved portion 51a. The swing member 52 is configured to slide along the support member 51 such that the hemispherical portion 52a can slide on the curved portion 51a. Figure 3 Arrow 5b shown in (B1) or Figure 3Arrow 5c, as shown in (B2), applies a force, thereby enabling the swing member 52 to assume an upright posture relative to the supporting member 51, as well as various tilting postures. The swing member 52 can be fixed in the state of being adjusted to the desired posture. Furthermore, the structure used to swing the swing member 52 is not limited to this; conventionally known structures can be used directly, or modified and adopted.

[0025] A pedestal portion 53 is provided on the opposite side of the hemispherical portion 52a of the swing member 52. The pedestal portion 53 is detachably provided relative to the swing member 52, but it can also be integrally formed with the swing member 52. (See reference...) Figure 3 (B1) The pedestal portion 53 has a first mounting portion 53a and a second mounting portion 53b arranged in an L-shape when viewed from the front. The first mounting portion 53a and the second mounting portion 53b are respectively the portions on which the resin molding portion 10 can be mounted. The first mounting portion 53a is the portion on which the evaluation plate 30 is mounted so that the evaluation surface 30a is horizontal when the swing member 52 is in an upright position. The second mounting portion 53b is the portion on which the evaluation plate 30 is mounted so that the evaluation surface 30a is vertical when the swing member 52 is in an upright position.

[0026] Figure 3 (B1) and Figure 3 Arrow 5a in (B2) extends vertically, indicating the direction in which the hook 101a is lifted by the device body 101. The angle adjustment fixture 50 can vary the angle of the evaluation surface 30a relative to the lifting direction of the hook 101a as described above. Therefore, the actual state of each part of the resin section 4 can be reproduced, and the demolding force of each part can be known.

[0027] [Determination Method] First, prepare multiple evaluation plates 30 with different surface treatments applied to the evaluation surface 30a, and provide a resin molding part 10 on each evaluation plate 30.

[0028] Next, the angle adjustment fixture 50 is set to reproduce the surface condition of the part of the actual resin part 4 where the demolding force is to be known, that is, the angle of that surface relative to the mold's pull-out direction. Regarding the setting of each part, first, it is selected whether the resin molding part 10 is to be set in the first setting part 53a or the second setting part 53b. Then, the posture of the oscillating member 52 is adjusted. Afterward, the resin molding part 10 is set in the selected setting part. The resin molding part 10 can also be set before adjusting the posture of the oscillating member 52.

[0029] After the resin molding section 10 is installed and the posture of the swinging member 52 is adjusted and fixed, the hook 101a is engaged with the engaging part 16c of the engaging member 16. Then, the device body 101 is operated to measure the force when the resin molded body 20 is pulled away from the evaluation surface 30a of the evaluation plate 30. The measured force is equivalent to the demolding force. Afterward, the resin molding section 10 is replaced in sequence and the force is measured in the same manner. In this way, the demolding force of each part in the resin molded article can be efficiently determined.

[0030] [Effect] The measuring device 100 of this embodiment, by having an evaluation plate that serves as a contact portion in contact with the resin molded article, can reproduce the relationship between the mold and the resin molded article. Furthermore, by having a engaging member with an engaging portion that engages with a hook portion on the measuring device body, the measuring device 100 can reproduce the action of pulling the resin molded article out of the mold. Thus, the demolding force in the actual resin molded article can be efficiently determined. Furthermore, by having an angle-adjusting fixture, the measuring device 100 can handle resin molded articles with complex shapes. Additionally, it can control the amount of resin used and reduce working time. Furthermore, it can prevent the discarding of the actual mold.

[0031] The embodiments of the present invention have been described in detail above, but the present invention is not limited to these specific embodiments, and various modifications and alterations can be made within the scope of the spirit of the present invention as set forth in the claims. Explanation of reference numerals in the attached figures

[0032] 1…Stator, 3…Coil section, 4…Resin section, 10…Resin molding section, 11…Pressure plate, 13…Cylindrical component, 13a…Internal space, 14…Posture holding plate, 15…Shaft insertion section, 16…Clamping component, 16a…Shaft section, 16b…Flange section, 16c…Clamping section, 20…Resin molded body, 30…Evaluation plate (contact section), 30a…Evaluation surface, 50…Angle adjustment fixture, 100…Demolding force measuring device, 101…Measuring device body, 101a…Hook section.

Claims

1. A demolding force measuring device, comprising: The main body of the measuring device has a hook. A cylindrical component that shapes the resin molded body inside; The engaging component is partially embedded in the resin molding body and has an engaging portion that engages with the hook portion; The contact portion has an evaluation surface that contacts the resin molded body; and An angle adjustment fixture is capable of changing the angle of the evaluation surface relative to the direction in which the hook is lifted by the main body of the measuring device.

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