JP4671725B2 - Manufacturing method of mold for molding - Google Patents

Description

The present invention relates to a method for producing a mold, a method for manufacturing a mold in which it is fixed integrally to each other by particular bury mold body to the mold base material.

  For example, a molding die that molds a transfer surface having a hemispherical part is composed of a hemispherical part and a flat part continuing from the hemispherical part. Finished by grinding using a grinder or the like during mold production. However, since it is difficult to grind the part having such a complicated curved surface shape, the molded product obtained by the completed molding die does not necessarily have sufficient required accuracy and function. In view of this point, there is a technique for creating a molding die by integrally fixing a plurality of different molding members, for example, as a molding die capable of obtaining a favorable curved surface shape even in the case of a complicated portion. Proposed.

That is, in Patent Document 1, a sphere made of tungsten carbide (WC) whose mirror surface is mirror-finished by polishing or the like is placed on a receiving mold formed in a concave shape with the same radius of curvature as the sphere. For example, a suction part for sucking a sphere is provided on the central axis of the receiving mold, and the sphere placed on the receiving mold is held on the receiving mold by vacuum suction through the suction part. It is disclosed. According to Patent Document 1, there is no room for scratches on the surface of the sphere, and any part of the sphere can be used as a transfer surface.
JP-A-11-199248 (page 2-3, FIG. 1)

  However, according to the technique of Patent Document 1 described above, there is described means for holding the sphere by vacuum suction to the receiving mold or mechanically fixing the sphere to the receiving mold with a holder. Even if the shape of the receiving mold and the sphere does not coincide with each other even in the above means, a gap is formed between the receiving mold and the sphere, which causes the sphere to rotate on the receiving mold or the sphere to be displaced. There were issues such as waking up. As described above, when the sphere rotates on the receiving mold or is displaced, the sphere is scratched or the shape of the transfer surface is changed, so that a uniform molded product cannot be obtained. .

The present invention has been made to solve such a problem, and an object of the present invention is to form a molded product having a complicated shape with high accuracy by integrally fixing a plurality of different mold members. It is to provide a method of manufacturing a mold which can be.

In order to achieve the above object, the method for producing a molding die of the present invention includes a step of disposing a mold base having a higher temperature at which it becomes a plastic state than the molded article material,
Placing the mold body on the mold substrate, which is made of a material that does not become a plastic state in a temperature range in which the mold substrate is in a plastic state, and which is processed and a part thereof becomes a transfer surface;
Heating the mold substrate;
A pressurizing step of pressurizing the mold main body toward the mold base so that the central axis of the mold base coincides with the central axis of the mold main body;
Immersing the mold body in the mold substrate, cooling the mold body in that state, and fixing the mold body and the mold substrate integrally.

In the manufacturing method of the mold described above, a step of disposing a mold base having a higher temperature that becomes a plastic state than the molded article material, and
Placing the mold body on the mold substrate, which is made of a material that does not become a plastic state in a temperature range in which the mold substrate is in a plastic state, and which is processed and a part thereof becomes a transfer surface;
Heating the mold substrate;
A pressurizing step of pressurizing the mold main body toward the mold base so that the central axis of the mold base coincides with the central axis of the mold main body;
The step of burying the mold main body in the mold base material, irradiating the mold base material with ultraviolet rays to cure the mold base material, and fixing the mold main body and the mold base material integrally. And comprising.

In the manufacturing method of the mold described above, a step of disposing a mold base having a higher temperature that becomes a plastic state than the molded article material, and
Placing the mold body on the mold substrate, which is made of a material that does not become a plastic state in a temperature range in which the mold substrate is in a plastic state, and which is processed and a part thereof becomes a transfer surface;
Heating the mold substrate;
A pressurizing step of pressurizing the mold main body toward the mold base so that the central axis of the mold base coincides with the central axis of the mold main body;
Immersing the mold body in the mold substrate, cooling in that state, and integrally fixing the mold body and the mold substrate;
After the mold body and the mold base are integrated, a step of fixing the plastic material from above the mold base so that there is no gap between the mold base and the mold base; Is provided.

Also, in the manufacturing method of the mold described above, the integrally affixing is carried out by fusing with the mold body and the mold base material.

The method of manufacturing a mold of the said integrally affixing is carried out by fixing with an adhesive or fasteners and said mold body and the mold base material.

The method of manufacturing a mold of the above, after integrally fixing the said mold base and the mold body, which pressurized Engineering the mold base material.

The method of manufacturing a mold of the said type substrate and the mold body, and after integrally fixing the plastic material, you pressurized Engineering the mold base material.

According to the present invention, the step of placing the mold base, the step of placing the mold main body on the mold base, the step of heating the mold base, and the process of pressing the mold main body toward the mold base. pressure step, the mold body and a step of integrally fixing and the mold base material, since provided the like, can be obtained forming shape-type that have a complicated shape easily.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 to FIG. 5 are diagrams showing manufacturing steps of the molding die according to the present embodiment. As shown in FIG. 1, a mold base (for example, glass) 1 having a higher plasticity temperature than a molded article material (for example, synthetic resin) is disposed in a cylindrical sleeve frame 2, and the sleeve frame is further disposed. A mold main body 3 made of a material that does not become plastic in the temperature range where the mold base 1 becomes plastic is placed on the upper surface of the mold base 1 on a substantially central axis 2. At this time, the central axis C of the sleeve frame 2 (substantially coincident with the central axis of the mold base 1) and the central axis C of the mold body 3 are substantially coincident. For this purpose, for example, the mold base 1 is disposed in the sleeve frame 2 without any gaps, and the mold body 3 is disposed so as to coincide with the substantially central axis of the sleeve frame 2. Further, as the material of the mold body 3, for example, a mirror-finished sphere made of cemented carbide, ceramics, or the like mainly composed of tungsten carbide (WC) is used, and at least the optical surface 3a (FIG. 2). (See) is polished.

  Next, as shown in FIG. 2, a pressure member 4 is slidably arranged in the sleeve frame 2 above the mold body 3. The pressurizing member 4 is formed with a clearance hole 5 having a circular cross section on the side facing the mold body 3. The escape hole 5 is provided so that the pressure member 4 does not come into contact with the optical surface (transfer surface) 3a of the mold body 3 and is not scratched. Is formed so as to substantially coincide with a center line (not shown) of the mold body 3. In this state, the mold base 1 and the mold body 3 are heated by energizing the heater 6. The heating temperature at this time is heated to a temperature at which the mold substrate 1 is in a plastic state.

  Next, the pressure member 4 is slightly slid in the direction approaching the mold base 1, and the relief hole 5 of the pressure member 4 is brought into contact with the mold body 3. At this time, even if the central axis of the mold main body 3 is initially placed at a position slightly displaced from the central axis of the sleeve frame 2, the mold main body 3 becomes the sleeve by the action of the escape hole 5 contacting the mold main body 3. It is positioned at a position substantially coincident with the central axis of the frame 2. In this state, as shown in FIG. 3, the mold body 3 is pressurized to the mold substrate 1 side with a predetermined pressure so that the pressure member 4 does not contact the optical surface 3 a of the mold body 3. The pressing surface 4a (see FIG. 2) is stopped at a position close to the surface 1a (see FIG. 2) of the mold base 1. Note that the sliding amount of the pressure member 4 is controlled with high precision by a motor or the like (not shown).

  In the state of FIG. 3, a part of the mold body 3 on the side facing the mold base 1 (a part excluding the optical surface 3 a) is buried in the mold base 1 in a plastic state, 1 is held in a holding portion 9 formed in 1 so that there is no gap. In the state where the mold base 1 is completely melted, the mold main body 3 falls into the mold base 1 by its own weight, so that the mold base 1 is heated until a certain degree of viscosity remains. In this state, energization to the heater 6 is stopped, the mold main body 3 and the mold base 1 are cooled, and the mold main body 3 is fused to the mold base 1 and fixed integrally. As a result, there is no gap between the mold body 3 and the mold substrate 1, and the two are firmly bonded. Therefore, the mold body 3 does not rotate or cause a position shift within the holding portion 9 of the mold base 1. The mold body 3 and the mold substrate 1 can be fixed by fusion, or can be fixed by a fixture such as an adhesive or a screw.

  Next, as shown in FIG. 4, the molding die 10 composed of the integrated die body 3 and the die base material 1 is taken out from the sleeve frame 2. The molding die 10 thus obtained accurately represents the complicated shape of the connection portion between the spherical die body 3 and the die base material 1, and therefore it is not necessary to finish this portion by grinding or the like. . The optical surface (transfer surface) 13 formed on the surface of the molding die 10 is, for example, any of Ni, C, Cr, Pt, Ir, Ti, B, and N for the purpose of mold release or oxidation prevention. It is coated with a film made of a substance containing one of them. Further, after the mold 10 is taken out from the sleeve frame 2, the end surface 1b of the mold base 1 is processed with a predetermined accuracy and finished with the center C of the mold body 3 as a reference line.

FIG. 5 is a diagram showing a method of molding a molded product material (for example, synthetic resin) 14a (see FIG. 5) using the molding die 10 obtained as described above. As shown in the figure, the molding die 10 is an upper die and a lower die, the upper die and the lower die are slidably disposed in the sleeve die 12, and a molded product material 14a is interposed between the upper die and the lower die. Place. Next, as shown in FIG. 6, if the molded article material 14a is heated to a temperature at which it becomes a plastic state with a heater (not shown), and then, for example, the upper mold is slid in the direction approaching the lower mold, A product (for example, an optical element) 14 is formed.
[Second Embodiment]
In this embodiment, in the same manner as described above, in FIG. 7, the mold base 21 having a higher temperature in a plastic state than the molded product material (for example, synthetic resin) is disposed in the sleeve frame 22, and further, the mold base A mold body 23 made of a material (such as WC) that does not become plastic in the temperature range where the mold base 21 becomes plastic is placed on the upper surface of 21. In this embodiment, an ultraviolet curable synthetic resin is used as the mold base 21. The sleeve frame 22 is made of a member that transmits ultraviolet rays.

  Next, the pressurizing member 24 is slidably arranged in the sleeve frame 22 above the mold body 23. In the same manner as described above, the pressing member 24 has a clearance hole 25 having a circular cross section on the side facing the mold body 23 so that the pressing member 24 does not contact the optical surface (transfer surface) 23a of the mold body 23. Is formed. The center line (not shown) of the escape hole 25 is formed so as to substantially coincide with the center line (not shown) of the sleeve frame 22. In this state, the heater 26 is energized to heat the mold base 21 and the mold body 23. The heating temperature at this time is heated to a temperature at which the mold base 21 is in a plastic state.

  Next, as shown in FIG. 8, the pressure member 24 is slid in the direction approaching the mold base 21, the relief hole 25 of the pressure member 24 is brought into contact with the mold body 23, and the mold body 23 is moved. Positioning is performed at a position substantially coincident with the central axis of the sleeve frame 22. In this state, the mold body 23 is pressurized with a predetermined pressure toward the mold base 21 so that the pressure member 24 does not contact the optical surface 23a of the mold body 23, and the pressure surface 24a of the pressure member 24 (FIG. 7). Reference) is stopped at a position close to the surface of the mold base 21. In this state, a part of the mold body 23 on the side facing the mold base 21 (a part excluding the optical surface 23a) is buried in the mold base 21 in a plastic state, and is embedded in the mold base 21. The formed holding portion 29 is held so that there is no gap. However, in a state where the mold base 21 is completely melted, the mold main body 23 falls into the mold base 21 due to its own weight. Therefore, the mold base 21 is heated until a certain degree of viscosity remains.

Next, the ultraviolet lamp 27 is turned on to irradiate the mold substrate 21 with ultraviolet rays. Since the mold base 21 is an ultraviolet curable synthetic resin, the mold base 21 is cured, and the mold base 21 and the mold body 23 are integrally fixed. In this case as well, the mold body 23 and the mold base 21 can be fixed by fusion, or can be fixed by a fixture such as an adhesive or a screw. In this way, a molding die similar to the molding die 10 shown in FIG. 4 is obtained.
[Third Embodiment]
In this embodiment, in FIG. 9, the mold base 31 and the mold body 33 are integrally fixed and the molding die 30 is molded by the above-described process. A plastic material 38 having a thickness is brought into close contact with the periphery of the mold body 33 so as not to have a gap, and is integrally fixed. For this purpose, a plastic material 38 is disposed on the upper surface of the mold base 31 in the mold 30 and heated to a temperature at which the plastic material 38 is in a plastic state by a heater (not shown). At this time, as the material of the plastic material 38, it is preferable to use a material that does not cause the mold base 31 to be in a plastic state in a temperature range in which the plastic material 38 is in a plastic state. Next, the pressure member 34 is slid in the direction approaching the mold base 31, the pressure surface 34 a of the pressure member 34 is brought into close contact with the plastic material 38, and then cooled. Then, a molding die 130 as shown in FIG. 10 is obtained. Finally, the mold 130 is finished by processing the end surface 36 of the mold base 31 with a predetermined accuracy with the center C of the mold body 33 as a reference line.

According to the present embodiment, as shown in FIG. 11, even if a gap 39 may be generated between the mold base 31 and the mold body 33 due to sink marks or the like during cooling, The surface optical surface (transfer surface) 37 is not affected at all, and the performance as a mold is not affected. In addition, the plastic material 38 and the mold 30 can be fixed by fusion, or can be fixed by a fixing tool such as an adhesive or a screw. By such a process, a molding die having a complicated shape can be easily obtained.
[Fourth Embodiment]
In this embodiment, as shown in FIG. 12, a mold base material (for example, glass) 41 having a higher plastic state than a molded article material (for example, synthetic resin) is disposed in the sleeve frame 42, and A conical die main body 43 made of a material that does not become a plastic state in a temperature range where the die base material 41 is in a plastic state is placed on a substantially central axis of the sleeve frame 42 and on the upper surface of the die base material 41. To do. The mold body 3 is made of a cemented carbide or ceramics mainly composed of tungsten carbide (WC), and the surface of the top cone portion is polished.

  Next, the pressure member 44 is slidably arranged in the vertical direction in the sleeve frame 42 above the mold body 43. As described above, the pressure member 44 has a clearance hole 45 having a circular cross section on the side facing the mold body 43 so that the pressure member 44 does not contact the optical surface (transfer surface) 43 a of the mold body 43. Is formed. The center line of the escape hole 45 is formed so as to substantially coincide with the center line of the sleeve frame 42. In this state, the mold base 41 and the mold body 43 are heated by energizing a heater (not shown). The heating temperature at this time is heated to a temperature at which the mold base 41 is in a plastic state.

  Next, the pressure member 44 is slid in the direction approaching the mold base 41, and the relief hole 45 of the pressure member 44 is brought into contact with the mold body 43. In this state, the mold body 43 is pressed to the mold base 41 side with a predetermined pressure so as not to contact the optical surface 43 a of the mold body 43, and faces the mold base 41 of the mold body 43. The side is buried in the mold base 41 in a plastic state. Further, the pressurization by the pressurizing member 44 is stopped at the position where the bottom surface of the mold main body 43 is in contact with the bottom surface of the sleeve frame 42.

In the state where the mold base 41 is completely melted, the mold main body 43 falls into the mold base 41 due to its own weight. Therefore, the mold base 41 is heated until a certain degree of viscosity remains. In this state, energization to the heater (not shown) is stopped, the mold main body 43 and the mold base 41 are cooled, and the mold main body 43 is fused to the mold base 41 and fixed integrally. In this case, the mold base 41 and the mold main body 43 can be fixed by fusion, or can be fixed by a fixture such as an adhesive or a screw. Next, as shown in FIG. 13, the molding die 40 composed of the integrated die body 43 and the die base material 41 is taken out from the sleeve frame 42. Further, the mold 40 is finished by processing the end surface 46 of the mold base 41 with a predetermined accuracy with the center C of the mold body 43 as a reference line.
[Fifth Embodiment]
FIG. 14 is a modified example of the above-described embodiment. In this embodiment, a conical cone shape having an anchor 55 on the bottom side and on the upper surface of the mold base 51 on the substantially central axis of the sleeve frame 52. The mold body 53 is placed. Then, in the same manner as described above, a heater (not shown) is energized to heat the mold base 51 and the mold main body 53, and then the pressure member 54 is slid in a direction approaching the mold base 51 to apply pressure. The mold body 53 is pressed to the mold base 51 side with a predetermined pressure so that the member 54 does not contact the optical surface (transfer surface) 53 a of the mold body 53. Then, the pressurization by the pressurizing member 54 is stopped at the position where the bottom surface of the mold body 53 is in contact with the bottom surface of the sleeve frame 52. In this state, energization to the heater (not shown) is stopped, the mold main body 53 and the mold base 51 are cooled, and the mold main body 53 is fused to the mold base 51 and fixed integrally. Also in this case, the mold base 51 and the mold main body 53 can be fixed by fusion, or can be fixed by a fixture such as an adhesive or a screw.

  Next, as shown in FIG. 15, the molding die 50 composed of the integrated die body 53 and the die base material 51 is taken out from the sleeve frame 52. Further, the mold 50 is finished by processing the end surface 56 of the mold base 51 with the center C of the mold body 53 as a reference line. According to this embodiment, since the mold body 53 has the anchor 55, the mold body 53 is not easily detached from the mold substrate 51 after molding.

It is a figure which shows the process which has arrange | positioned the mold base material in a sleeve frame (1st Embodiment). It is a figure which shows the process which mounted the type | mold main body on the type | mold base material (1st Embodiment). It is a figure which shows the process which pressurized the type | mold main body to the type | mold base material side (1st Embodiment). It is a figure which shows the obtained shaping | molding die (1st Embodiment). It is a figure which shows the state which shape | molds a molded article raw material with the shaping | molding die (1st Embodiment). It is a figure which shows the state which shape | molds a molded article raw material with the shaping | molding die (1st Embodiment). It is a figure which shows the process which mounted the type | mold main body on the type | mold base material (2nd Embodiment). It is a figure which shows the process which pressurized the type | mold main body to the type | mold base material side (2nd Embodiment). It is a figure which shows the process which mounted the type | mold main body on the type | mold base material (3rd Embodiment). It is a figure which shows the obtained shaping | molding die (3rd Embodiment). It is a figure which shows the obtained shaping | molding die (3rd Embodiment). It is a figure which shows the process which mounted the type | mold main body on the type | mold base material (4th Embodiment). It is a figure which shows the obtained shaping | molding die (4th Embodiment). It is a figure which shows the process which mounted the type | mold main body on the type | mold base material (5th Embodiment). It is a figure which shows the obtained shaping | molding die (5th Embodiment).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Type | mold base material 1b End surface 2 Sleeve frame 3 Type | mold main body 3a Optical surface 4 Pressing member 9 Holding | maintenance part 10 Molding die 14 Molded product 14a Optical element material 21 Mold base material 22 Sleeve frame 23 Mold main body 23a Optical surface 24 Pressure member 27 Ultraviolet lamp 29 Holding part 30 Molding die 31 Mold base 33 Mold body 36 End face 39 Holding part 40 Molding mold 41 Mold base 42 Sleeve frame 43 Mold body 43a Optical surface 46 End face 50 Molding die 51 Mold base 52 Sleeve frame 53 Mold body 53a Optical surface 56 End surface

Claims (7)

A step of arranging a mold base having a higher temperature than the molded article material to be in a plastic state;
Placing the mold body on the mold substrate, which is made of a material that does not become a plastic state in a temperature range in which the mold substrate is in a plastic state, and which is processed and a part thereof becomes a transfer surface;
Heating the mold substrate;
A pressurizing step of pressurizing the mold main body toward the mold base so that the central axis of the mold base coincides with the central axis of the mold main body;
The mold body is embedded in the mold base material, cooled in that state, and integrally fixed to the mold body and the mold base material. A step of arranging a mold base having a higher temperature than the molded article material to be in a plastic state;
Placing the mold body on the mold substrate, which is made of a material that does not become a plastic state in a temperature range in which the mold substrate is in a plastic state, and which is processed and a part thereof becomes a transfer surface;
Heating the mold substrate;
A pressurizing step of pressurizing the mold main body toward the mold base so that the central axis of the mold base coincides with the central axis of the mold main body;
The step of burying the mold main body in the mold base material, irradiating the mold base material with ultraviolet rays to cure the mold base material, and fixing the mold main body and the mold base material integrally. And a method for producing a molding die. A step of arranging a mold base having a higher temperature than the molded article material to be in a plastic state;
Placing the mold body on the mold substrate, which is made of a material that does not become a plastic state in a temperature range in which the mold substrate is in a plastic state, and which is processed and a part thereof becomes a transfer surface;
Heating the mold substrate;
A pressurizing step of pressurizing the mold main body toward the mold base so that the central axis of the mold base coincides with the central axis of the mold main body;
Immersing the mold body in the mold substrate, cooling in that state, and integrally fixing the mold body and the mold substrate;
After the mold body and the mold base are integrated, a step of fixing the plastic material from above the mold base so that there is no gap between the mold base and the mold base; The manufacturing method of the shaping | molding die provided with. In the manufacturing method of the shaping die according to any one of claims 1 to 3 ,
The method of manufacturing a molding die, wherein the integrally fixing step is performed by fusing the mold base and the mold body. In the manufacturing method of the shaping die according to any one of claims 1 to 3 ,
The step of integrally fixing is a method for manufacturing a mold for molding, wherein the mold base and the mold main body are fixed with an adhesive or a fixture. In the manufacturing method of the shaping | molding die in any one of Claims 1, 2 , 4 , and 5 ,
A method for producing a mold for molding, wherein the mold base is processed after integrally fixing the mold body and the mold base. In the manufacturing method of the shaping die according to claim 3,
A method for producing a mold for molding, wherein the mold base is processed after integrally fixing the mold body, the mold base, and the plastic material.

Images