Mold

Abstract

To provide a mold capable of processing rubber or processing rubber alone on a pressurized object such as a metal part or a resin part at low pressure even when, particularly, a large press machine is used.SOLUTION: A mold of the present invention for processing rubber or rubber alone on a pressurized body includes: an upper mold; a lower mold; and a middle mold located between the upper mold and the lower mold and having a rubber molding part between the lower mold and itself. An elastic body is interposed between the upper mold and the middle mold. Only a force due to compression of the elastic body is applied to the middle mold.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a mold for processing rubber on a pressurized object such as a metal part or a resin part, or for processing a single rubber body.

Background Art

[0002] For example, when processing rubber on a pressurized object such as a metal part or a resin part, depending on the mold size, it may be necessary to use a large press machine. However, the minimum pressure required to stably operate a large press machine is high, and there has been a problem that the product is deformed or damaged depending on the material and the pressure receiving area of the pressurized object. Also, when there is a tolerance in the thickness of the pressurized object, there has been a problem that when pressed at high pressure, the pressurized object is not uniformly pressurized and is deformed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Documents 1 and 2 disclose inventions related to a press device, but none of these documents are press devices for processing rubber on a pressurized object such as a metal part or a resin part, or for processing a single rubber body, and a device design corresponding to the above problems is not assumed.

[0005] The present invention has been made in view of this point, and particularly, an object of the present invention is to provide a mold capable of processing rubber on a pressurized object such as a metal part or a resin part, or processing a single rubber body at a low pressure even when using a large press machine.

Means for Solving the Problems

[0006] The mold of the present invention is a mold for processing rubber on a body to be pressed or for processing a single rubber body, and includes an upper mold, a lower mold, and a middle mold located between the upper mold and the lower mold and having a rubber molding portion between the lower mold, and an elastic body is interposed between the upper mold and the middle mold.

Effects of the Invention

[0007] By using the mold of the present invention, when processing rubber on a body to be pressed or processing a single rubber body, even when a large press machine is used, pressing can be performed at a low pressure, and deformation and breakage of the product can be prevented.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, an embodiment of the present invention (hereinafter abbreviated as "embodiment") will be described in detail. Note that the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the gist thereof.

[0010] <Detailed Description of the Structure of the Mold 1 of the Present Embodiment> FIG. 1 is a partial cross-sectional schematic view showing a state in which a body to be pressed is installed in the mold of the present embodiment. FIG. 2 is a partial cross-sectional schematic view showing a state in which the mold of FIG. 1 is pressed and compressed. FIG. 3 is a partial cross-sectional schematic view showing only the mold with the body to be pressed removed from FIG. 1. FIG. 4A is a plan view of the lower mold, and FIG. 4B is a plan view of the upper mold. FIGS. 1 to 3 are cross-sectional views taken along the dashed-dotted line shown in FIGS. 4A and 4B. Hereinafter, the structure of the mold 1 of the present embodiment will be described centering on FIGS. 1 and 4. As shown in FIG. 1, the mold 1 is configured to include an upper mold 2, a middle mold 3, and a lower mold 4.

[0011] [Lower mold 4] The lower mold 4 has, for example, a polygonal plane, and in FIGS. 1 and 4A, it is formed in a rectangle or a square, but is not limited thereto. The planar shape of the mold 1 is variously changed according to the shape of the body to be pressed 5 and the specifications of the large press machine.

[0012] As shown in FIGS. 1 and 4A, the lower mold 4 has a first surface 4a and a second surface 4b, and the first surface 4a and the second surface 4b face each other in the thickness direction. The first surface 4a is the surface that becomes the outer surface when assembled to the mold 1. The second surface 4b is the surface on the side facing the middle mold 3.

[0013] As shown in FIGS. 1 and 4A, an installation surface 6 for installing the body to be pressed 5 is provided on the second surface 4b. The installation surface 6 is planar and has an area larger than the planar area of the body to be pressed 5. Further, a convex portion 7 protruding upward (in the direction of the upper mold 2) is provided around the installation surface 6. The surface 7a of the convex portion 7 is planar. The height h1 from the surface 7a of the convex portion 7 to the installation surface 6 is larger than the sum of the respective thicknesses of the body to be pressed 5 and the middle mold 3 installed on the installation surface 6. Therefore, as shown in FIG. 2, even when the upper mold 2 is pressed downward to the limit, a space g1 remains between the upper mold 2 and the middle mold 3.

[0014] As shown in FIGS. 1 and 4A, a plurality of through holes 8 and 9 communicating from the first surface 4a to the second surface 4b are formed around the installation surface 6 of the lower mold 4.

[0015] As shown in Fig. 1, the through-hole 8 is provided so as to penetrate an intermediate portion 10 which is around the installation surface 6 and has a height between the installation surface 6 and the convex portion 7.

[0016] The side portion of the intermediate portion 10 on the side of the installation surface 6 also functions as a positioning portion when the object to be pressurized 5 is installed on the installation surface 6 of the lower mold 4. As shown in Fig. 1, the height h2 of the intermediate portion 10 from the installation surface 6 is lower than the height h1 of the convex portion 7 located outside the intermediate portion 10. The preferable size of the height h2 of the intermediate portion 10 will be described later.

[0017] The through-hole 9 is formed from the surface 7a of the convex portion 7 located outside the intermediate portion 10 to the first surface 4a. The number and arrangement of the through-holes 8 and 9 can be arbitrarily determined so that the upper mold 2 and the middle mold 3 can be stably translated in the height direction.

[0018] [Middle mold 3] In the present embodiment, a middle mold 3 is provided between the upper mold 2 and the lower mold 4. The middle mold 3 has a third surface 3a and a fourth surface 3b, and the third surface 3a and the fourth surface 3b face each other in the thickness direction. The third surface 3a is the lower surface on the side facing the second surface 4b of the lower mold 4. The fourth surface 3b is the upper surface on the side facing the upper mold 2.

[0019] The middle mold 3 is slightly smaller in size than the lower mold 4, and its planar shape is not limited. For example, it is formed in a rectangle or a square similar to the lower mold 4. As shown in Fig. 1, an uneven rubber molding surface 3c for forming a rubber molding portion 11 is provided on the third surface 3a of the middle mold 3 so as to abut against the object to be pressurized 5 installed on the lower mold 4. This rubber molding surface 3c contacts the side wall portion of the groove 5a provided in the object to be pressurized 5 to form the rubber molding portion 11. Although not shown, in the rubber processing step, the rubber composition provided in the rubber molding portion 11 is subjected to pressure and heating, and is vulcanized and adhered to the object to be pressurized 5, for example, and at this time, the surface of the rubber is formed into the shape of the rubber molding surface 3c.

[0020] On the third surface 3a of the medium-sized part 3, a first boss 12 is provided at a position facing a through-hole 8 formed in the lower mold 4. As shown in FIG. 1, by inserting the first boss 12 into the through-hole 8, the medium-sized part 3 can be placed on the lower mold 4. The through-hole 8 serves as a guide surface for the first boss 12 and allows the medium-sized part 3 to be translated in the height direction parallel to the lower mold 4.

[0021] In FIG. 1, the fourth surface 3b of the medium-sized part 3 is flat, but a recess for attaching a coil spring 14 described later may be formed.

[0022] [Upper mold 2] As shown in FIG. 1, the upper mold 2 has a fifth surface 2a and a sixth surface 2b, and the fifth surface 2a and the sixth surface 2b face each other in the thickness direction. The fifth surface 2a is the surface facing the medium-sized part 3, and the sixth surface 2b is the outer surface when the mold 1 is assembled.

[0023] As shown in FIG. 1, a plurality of recesses 6c are provided on the fifth surface 2a of the upper mold 2. Each recess 6c is provided at a position facing the medium-sized part 3. A coil spring 14 as an elastic body is attached in these recesses 6c. Although not shown, the coil spring 14 can be fixed in the recess 6c using bolts or the like.

[0024] A plurality of coil springs 14 are provided, and each coil spring 14 is arranged at a predetermined interval.

[0025] The number and arrangement of the coil springs 14 shown in FIG. 4B are an example. That is, in the present embodiment, it is sufficient if the medium 3 can be uniformly pressurized as a whole by a plurality of coil springs 14. Further, in order to suppress damage to the object to be pressed 5, even when a large press machine is used, in order to perform low-pressure pressing, the spring constant and number of the coil springs 14, or the size of the space g1 can be optimized to determine a preferable range of the surface pressure applied to the medium 3. Note that the size of the space g1 can be controlled by adjusting the height h1 of the convex portion 7. Here, although not limited, as an example, the "large press machine" can be defined as a press pressure of about 200 tf or more in nominal capacity. In the present embodiment, the surface pressure applied to the medium 3 is preferably 2 80000 kgf / cm 2 or less, preferably 2 77 kgf / cm 2 or less, more preferably 2 30 kgf / cm 2 or less, and even more preferably. Further, the lower limit value of the surface pressure is 0.01 kgf / cm 2 or 2 about 0.02 kgf / cm. From the above, the surface pressure applied to the medium 3 is in the range of 0.01 kgf / cm 2 to 80000 kgf / cm 2 , preferably in the range of 0.01 kgf / cm 2 to 88 kgf / cm 2 , more preferably in the range of 0.02 kgf / cm 2 to 77 kgf / cm 2 , and even more preferably in the range of 0.02 kgf / cm 2 to 30 kgf / cm 2 . Thereby, low pressure of the large press machine can be realized, and deformation and breakage of the product can be suppressed.

[0026] In order to more effectively suppress deformation and breakage of the product, the maximum value of the surface pressure is preferably 88 kgf / cm 2 or less, or 2The following is more preferable. This can be confirmed as the surface pressure range obtained by variously selecting the spring constant and number of the coil springs 14 and the size of the space g1 while using the large press machine defined above and reducing the press pressure to near the minimum. Further, the maximum value of the surface pressure is 30 kgf / cm as described above. 2 The following is even more preferable. This can be confirmed as the surface pressure range that can be used for a long time without problems such as the durability of the coil spring 14 and the mold strength when applying press pressure from the large press machine to the mold 1, not only further reducing the pressure of the large press machine but also effectively suppressing deformation and breakage of the product. By using the mold 1 of the present embodiment, it can be adjusted to an arbitrary pressure even in a low pressure region outside the movable range of the press by the large press machine (for example, 15% or less, preferably 10% or less, more preferably 5% or less with respect to the press pressure of the large press machine). Therefore, wide forming becomes possible using conventional equipment.

[0027] As shown in FIGS. 1 and 4B, a second boss 13 is provided at a position on the fifth surface 2a of the upper mold 2 that faces the through hole 9 provided in the lower mold 4. As shown in FIG. 1, the intermediate mold 3 is installed on the lower mold 4, and the upper mold 2 is installed on the intermediate mold 3 via the coil springs 14. At this time, the first boss 12 is inserted into the through hole 8, and the second boss 13 is inserted into the through hole 9. As a result, as shown in FIG. 1, in the laminated arrangement of the lower mold 4, the intermediate mold 3, and the upper mold 2 from below, rubber is processed on the object to be pressed 5 between the lower mold 4 and the intermediate mold 3, and a plurality of coil springs 14 for realizing a low-pressure press are interposed between the intermediate mold 3 and the upper mold 2.

[0028] <Regarding the structure and problems of conventional molds> FIG. 5A is a partial cross-sectional schematic view of a conventional mold, and FIG. 5B is a partial cross-sectional schematic view showing a state where the mold of FIG. 5A is pressurized.

[0029] As shown in FIG. 5A, the mold 20 is composed of an upper mold 22, an intermediate mold 23, and a lower mold 24, but no coil spring is provided between the upper mold 22 and the intermediate mold 23 as in the present embodiment.

[0030] As shown in FIG. 5A, the object 5 to be pressed is placed on the lower mold 24. The object 5 to be pressed has a groove 5a, and a rubber composition (not shown) is disposed in this groove 5a. On the other hand, on the middle mold 23, a concavo-convex rubber molding surface 23c is formed at a position facing the groove 5a. The shape of the rubber molding surface 23c forms the shape of the rubber surface to be processed on the object 5 to be pressed.

[0031] Using a large press machine, the mold 20 in FIG. 5A is pressed downward. As a result, the rubber composition in the rubber molding portion 25 formed by the rubber molding surface 23c of the middle mold 23 abutting against the side wall of the groove 5a is pressed and heated, and is vulcanized and adhered to the object 5 to be pressed, for example.

[0032] By the way, the object 5 to be pressed is formed of, for example, a soft metal plate such as aluminum or an aluminum alloy, or a resin part. Also, the dotted line portion shown in FIG. 5B is the pressure receiving portion d, but it is composed of only the necessary portion according to the product shape, and the pressure receiving area of this portion d is small. Alternatively, the rubber alone may be processed. Thus, due to using a soft material or the small pressure receiving area of the object to be pressed, it is desired to process using a smaller press machine instead of a large press machine. However, when a large press machine must be used due to the mold size, a strong force is applied to the object 5 to be pressed, and rubber back lining occurs, and the product is deformed or damaged.

[0033] Therefore, as a result of intensive research by the present inventor, in order to realize low-pressure pressing with a large press machine, the inventor has invented the structure of the mold 1 of the present embodiment.

[0034] <Regarding the characteristic structure of the mold 1 of the present embodiment> In the present embodiment, as shown in FIG. 1, a coil spring 14 as an elastic body is disposed between the upper mold 2 and the middle mold 3 constituting the mold 1. The operation of the mold 1 of the present embodiment will be described.

[0035] Figure 1 shows a state where the object 5 to be pressed is placed on the installation surface 6 of the lower mold 4, the middle mold 3 is placed on the lower mold 4 with the first boss 12 inserted into the through hole 8, and further, the upper mold 2 is placed on the middle mold 3 with the second boss 13 inserted into the through hole 9, and no pressure is applied from the large press machine.

[0036] Therefore, due to the height of the coil spring 14 between the middle mold 3 and the upper mold 2, the upper mold 2 is held in a state of floating upward from the surface 7a of the convex portion 7 of the lower mold 4. Thus, a gap g2 is provided between the surface 7a of the convex portion 7 of the lower mold 4 and the fifth surface 2a of the upper mold 2.

[0037] Press the upper mold 2 downward with a large press machine from the state shown in Figure 1 (see Figure 2). At this time, the force applied to the upper mold 2 is a high pressure as in the conventional case, for example, several tens of tons to several hundreds of tons. The upper mold 2 moves downward, but the stroke amount m is the size of the gap g2 shown in Figure 1. That is, as shown in Figure 2, the upper mold 2 moves downward to contact the surface 7a of the convex portion 7 formed on the lower mold 4, so the movement of the upper mold 2 stops. The surface 7a of the convex portion 7 functions as a stopper surface that controls the downward movement of the upper mold 2.

[0038] As shown in Figure 2, even when the upper mold 2 is pressed downward to the limit, a space g1 is provided between the upper mold 2 and the middle mold 3. At this time, as the upper mold 2 moves downward, the coil spring 14 interposed between the upper mold 2 and the middle mold 3 is compressed. Thereby, the force (repulsive force) generated by the compression of the coil spring 14 is applied to the middle mold 3. That is, according to the configuration of the mold 1 of the present embodiment, the high pressing force of the large press machine does not act on the middle mold 3. For this reason, even when using a large press machine, only the force corresponding to the compression of the coil spring 14 is applied to the pressure-receiving portion d of the object 5 to be pressed and the rubber molding surface 3c via the middle mold 3. Different from the conventional case shown in Figure 5, rubber processing (such as vulcanization) can be performed with a low-pressure press, and damage to the object 5 to be pressed and rubber back lining can be suppressed.

[0039] In the present embodiment, the middle mold 3 and the surface pressure applied to the object 5 to be pressed through the middle mold 3 are 0.01 kgf / cm 2~80000 kgf / cm 2 、 preferably, 0.01 kgf / cm 2 ~88 kgf / cm 2 、 more preferably, 0.02 kgf / cm 2 ~77 kgf / cm 2 、 even more preferably, 0.02 kgf / cm 2 ~30 kgf / cm 2 It can be controlled to be within the range. Thereby, even when the pressurized body 5 made of a soft material such as aluminum or resin is used, the problem that the pressurized body 5 is damaged or the rubber backlines and the product is deformed or damaged can be effectively solved.

[0040] The surface pressure can be calculated by the following formula (1). Surface pressure (kgf / cm 2 ) = spring constant (kgf / mm) × stroke amount (mm) × number of coil springs (pieces) / pressure receiving area (cm 2 ) ··· (1)

[0041] Although not limiting, based on formula (1), the number of coil springs 14 is adjusted to 4 to 69, the spring constant is adjusted to 0.1 to 241 kgf / mm, the stroke amount mm is set to 1 to 5 mm, and the pressure receiving area is 1 cm 2 ~2500 cm 2 Then, the surface pressure can be adjusted to be within the range of 0.02 kgf / cm 2 ~83741 kgf / cm 2 Note that the weight of Medium 3 was set to 60 Kg.

[0042] Also, by using the mold 1 of the present embodiment, rubber can be vulcanized and adhered by a low-pressure press regardless of the thickness tolerance of the pressurized body 5.

[0043] In the present embodiment, the second surface 4b of the lower mold 4 includes an installation surface 6 for installing the pressurized body 5, a convex portion 7 that protrudes in the direction of the upper mold 2 and whose surface 7a forms a stopper surface against the upper mold 2, and an intermediate portion 10 having a height between the installation surface 6 and the surface 7a of the convex portion 7.

[0044] The convex portion 7 has a height h1 from the installation surface 6, and the intermediate portion 10 has a height h2 from the installation surface 6. The preferable size of the height h2 is adjusted so that, as shown in FIG. 3, the third surface 3a of the medium-sized mold 3 does not contact the installation surface 6 of the lower mold 4 in a state where the object to be pressed 5 is removed. Since there is an uneven rubber molding surface 3c or the like protruding in the direction of the installation surface 6 on the third surface 3a, it is necessary to adjust the height of the intermediate portion 10 so that the rubber molding surface 3c does not contact the installation surface 6.

[0045] Also, it is preferable that the heights h1 and h2 are adjusted so that the height obtained by subtracting the height h2 from the height h1 is larger than the thickness of the medium-sized mold 3. Thereby, as shown in FIG. 2, in a state where the upper mold 2 is moved by the stroke amount m and abutted against the convex portion 7 of the lower mold 4, a space g1 can be formed between the upper mold 2 and the medium-sized mold 3, and the high pressure of the large press machine does not act on the medium-sized mold 3, and it is possible to control so that only the force accompanying the compression of the coil spring 14 is applied to the medium-sized mold 3.

[0046] In the present embodiment, examples of the object to be pressed 5 include a metal plate such as aluminum and a resin part. Further, it can be applied not only to products processed by vulcanizing and adhering rubber to the object to be pressed 5, but also to products made of rubber alone. By using the mold 1 of the present embodiment, deformation and breakage of the product can be suppressed.

[0047] As described above, by using the mold 1 of the present embodiment, it is possible to perform low-pressure pressing with a large press machine.

Industrial Applicability

[0048] According to the mold of the present invention, even when a large press machine is used, rubber can be processed on the object to be pressed or a rubber alone can be processed at a low pressure. Therefore, the object to be pressed is less likely to be damaged, and the back lining of the rubber can be suppressed, and the product yield can be increased. In the present invention, it is possible to cope with large-sized and soft objects to be pressed, and it is possible to apply pressure at a low pressure regardless of the tolerance of the object to be pressed. Therefore, it can be applied to molds that can cope with rubber vulcanization adhesion and the like in various fields such as precision instruments, electronic devices, and automotive-related parts.

Explanation of Signs

[0049] 1: Mold 2: Upper mold 3: Middle mold 4: Lower mold 5: Workpiece under pressure 5a: Groove 6: Installation surface 7: Protrusion 8: Through hole 9: Through hole 10: Intermediate part 11: Rubber molding part 12: First boss 13: Second boss 14: Coil spring 20: Mold 22: Upper mold 23: Middle mold 23c: Rubber molding surface 24: Lower mold 25: Rubber molding part d: Pressure receiving part g1: Space g2: Gap h1: Height h2: Height m: Stroke amount

Claims

1. A mold for processing a rubber or processing a rubber alone on a body to be pressurized, comprising: an upper mold, a lower mold, and a middle mold located between the upper mold and the lower mold and having a rubber molding portion between the middle mold and the lower mold. The mold is characterized in that an elastic body is interposed between the upper mold and the middle mold.

2. The mold according to claim 1, wherein only the force due to compression of the elastic body is applied to the middle mold.

3. The lower mold is provided with a convex portion protruding toward the upper mold, the surface of the convex portion is a stopper surface with which the upper mold contacts when the upper mold is pressurized in the direction of the lower mold, and the mold according to claim 1, wherein there is a space between the upper mold and the middle mold in a state where the upper mold contacts the stopper surface, and the compressed elastic body is disposed in the space.

4. The mold according to claim 1, wherein the elastic body is a plurality of coil springs disposed between the upper mold and the middle mold.

5. The surface pressure applied to the medium is 0.01 kgf / cm ２ or more and 80,000 kgf / cm ２ or less, and the elastic body is arranged as such. The mold according to claim 3, characterized by this fact.

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