JP2746464B2 - Glass lens molding equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for glass lenses used in optical instruments, and more particularly to a molding apparatus suitable for production of various and small quantities.

[Prior Art] In recent years, optical glass lenses are available in a wide variety of types, and there is a demand for efficiently producing lenses of various types. As an apparatus that meets this demand, for example, a molding machine described in Japanese Patent Application Laid-Open No. 63-260830 is disclosed. This molding machine is provided with a plurality of mold fitting parts, and a mold mount, which is detachably attached to these fitting parts with a press mold provided with a lens molding surface of a desired lens at its tip, approaches and separates in the pressing direction. As far as possible, holding each mold mount rotatable,
A structure is provided in which the pressing directions of the mold mounts are rotatably held on the same plane.

[Problem to be Solved by the Invention] The conventional example described in the above-mentioned publication is mounted on a rotatable mold mount, and the lower glass lens molding part is separated from the processing axis operated by pressing and the position is shifted. Therefore, there is a drawback in that a moment is applied to the machining axis during molding and rigidity problems occur. Therefore, when pressed, the position of the upper and lower dies becomes unstable due to insufficient rigidity of the processing axis, and the knitting center between the lens surfaces, which is a very important point in the performance of the lens, is not stable,
In addition, there is a problem that high accuracy cannot be maintained. Furthermore, since high pressure is applied to the upper and lower dies during molding, bending occurs in the mold mount and processing shaft, and the pressing force and the positional relationship between the press molding part and the molding material become less uncertain. It was difficult to mold a lens that required transferability.

The present invention has been made in view of these problems, and is suitable for molding various kinds of glass lenses, and realizes high precision and eccentricity between lens surfaces even with a processing axis having low rigidity. The object of the present invention is to provide a glass lens forming apparatus capable of press-forming a glass lens having significantly improved transferability of press molding while significantly reducing the mold changing time and setup time and improving the working efficiency. And

[Means and Actions for Solving the Problem] Press forming dies each having a desired lens forming surface at the tip thereof are arranged side by side on the upper and lower mold rotating disks on concentric circles around the rotation axis of the mold rotating disks. Then, when pressing the glass material, the central axes of the pair of upper and lower press forming dies in the press forming die are arranged on the axis of the press forming shaft.

EXAMPLES Hereinafter, a glass lens manufacturing apparatus according to the present invention will be described based on examples shown in the drawings.

(First Embodiment) FIGS. 1 to 4 show a first embodiment, FIG. 1 is a partially cutaway sectional view, FIG.
FIG. 3 is a partially cutaway sectional view at the end of the process, and FIG. 4 is a partially cutaway sectional view of a state in which a glass lens is being formed.

In FIG. 1, reference numeral 1 denotes an upper mold having a glass lens molding surface at the tip, and the upper mold 1 is detachably held by an upper mold mount 5, and the upper mold mount 5 has an angle of 30 degrees with respect to the processing axis 25. It is attached to an upper die turntable 3 rotatably held about a rotation shaft 2 arranged at an inclination angle on a concentric circle centered on the rotation shaft 2 via an upper heat insulation material 4 in an equal sense. I have. The upper die turntable 3 comes into surface contact with the receiving surface 6 of the upper base 9,
A bearing 7 and a spring 8 are attached to the rotating shaft 2 of the upper die turntable 3. The spring 7 is urged by the spring 8 via the bearing 7. The mold turntable 3 is pressed against the upper base 9. FIG. 28 shows a tapered engagement hole provided on the lower surface of the upper die turntable 3, that is, a contact surface with the receiving surface 6. The positioning pin 10 having a tip shape coinciding with the engagement hole 28 is attached to the upper base. 9, the positioning pin 10 is driven by a pin driving cylinder 11,
By associating the pin 10 with the engaging hole 28, the center axis of the upper die 1 is positioned with high precision at a position coinciding with the processing axis 25.

Further, a gear 12 is provided on an outer peripheral portion of the rotating disk 3, and a driving gear 13 is meshed with the gear 12 so that a driving gear 13
Attached to the tip of the shaft.

Reference numeral 40 denotes a cooling water circulation path through which cooling water circulates.

The lower die 15 is detachably held by a lower die mount 20, and the lower die mount 20 is held by a lower die turntable 18, which is freely rotatably held by a lower base 17 fixed to the upper part of the vertical drive shaft 16. They are attached at equal intervals via a heat insulating material 19, and the remaining points have the same configuration as that of the upper mold 1, so that the description will be omitted.

The upper base 9 is fixed to the gantry 21 by a plurality of columns or the like (not shown), and the drive shaft 16 is held with high precision by a guide 22 built in the gantry 21 and vertically driven by a driving mechanism (not shown). Do.

Next, the operation of this embodiment will be described with reference to FIGS.

FIG. 2 shows a state where the upper die roll 3 is rotated and the upper die 1 is replaced. When rotating the upper die 1, the positioning pin 10 is rotated by an appropriate amount while the positioning pin 10 is pulled up by the pin driving cylinder 15, and the upper die 1 fixed to the upper die turntable 3 via the gear 12 drive gear 13. Is rotated near the machining axis center 25. This operation is the same for the lower mold 15. Also,
When the mold is replaced, a molding chamber window 27 installed on the side surface of the molding chamber 26 and held openably and closable by a driving method (not shown) opens, so that the interference between the upper mold 1 and the wall surface of the molding chamber is released.

FIG. 3 shows a state in which the upper and lower dies 1, 15 are positioned on the machining axis 25. The upper die 1 moved by the motor 14 to the vicinity of the machining axis 25 is pushed by the pin drive cylinder 15 into the positioning pin 10 into a tapered engagement hole 28 opened on the sliding surface of the upper die rotating disk 3. The upper and lower dies 1 and 15 are positioned so that the central axes thereof coincide with the machining axis 25 with high precision. After the positioning, the molding chamber window 27 is closed.

FIG. 4 shows a state in which a glass lens is being formed by the mechanism of the present embodiment. The upper and lower dies 1,
In a state where the center axis of 15 is accurately aligned with the processing axis 25, the glass material 23 heated to a moldable temperature in a heating furnace (not shown) is transferred onto the processing axis 25 by the sailing arm 24. In this state, the lower die 15 held by the lower base 17 and the lower die turntable 18 installed on the drive shaft 16 is driven by a drive mechanism (not shown).
The glass material 23 is lifted together with 16 to lift the glass material 23 on the transfer arm 24, and at the same time, the glass material 23 is pressed with the upper mold 1 to form the glass material into a desired optical lens shape.

The effect of this embodiment is that a plurality of dies held at the tips of a plurality of upper and lower mold mounts installed on the upper and lower mold rotating discs are rotated at an angle of 30 degrees with the processing axis axis. By rotating the plate, it is possible to automatically change the mold, and by rotating the machining axis and the rotating plate at an angle, interference during molding of a mold other than the one used for molding can be prevented. Has the effect that lenses of different shapes can be molded very easily.

Second Embodiment FIG. 5 is a partially cutaway sectional view showing a second embodiment of the present invention. Hereinafter, a second embodiment will be described.

In FIG. 5, an upper mold 30 having a glass lens molding surface at its tip is detachably held by an upper mold mount 35, and the upper mold mount 35 is positioned parallel to the chemical processing axis 31 and a rotating shaft 32. Are provided on a concentric circle centered on the rotation shaft 32 of an upper die turntable 33 which is rotatably held about the center via an upper heat insulating material.

Other mold rotation mechanisms and mold positioning mechanisms are the first
The description is omitted because it is the same as the embodiment. The lower mold 36 is also configured by the same mechanism as the upper mold 30. FIG. 6 is a plan view showing the arrangement of a plurality of upper mold installation positions 37 and lower mold installation positions 38 of this embodiment. The setting positions of the upper die setting position 37 and the lower die setting position 38 are, as shown in the example of FIG. 6, with respect to dies other than the dies used for forming at the forming position 39, any upper and lower dies do not interfere with each other. It is installed in a position.

The operation of this embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

As an effect of the present embodiment, a plurality of dies held on the tops of the upper and lower mold mounts are installed on the upper and lower mold rotating disks, and the plurality of molds held on the rotating shaft 32 positioned in parallel with the processing axis center 31 are centered. By rotating the upper and lower mold rotating disks to make the axis of the upper and lower molds coincide with the axis of the processing axis, a high-precision positioning is enabled without generating a force (component force) other than the direction of the processing axis. In addition, by setting the positions of the upper and lower dies other than the dies used for molding so as not to interfere with each other, interference with other dies during molding can be prevented. As described above, in the present embodiment, since no force is generated in a direction other than the direction along the processing axis, there is an effect that lenses of different shapes can be formed with extremely high precision and easily.

[Effects of the Invention] According to the present invention, since the centers of a pair of upper and lower dies used during the press forming operation are arranged on the axis of the processing shaft, the press forming pressure directly acts on the lens forming surface. ,
The bending moment, which has been a problem in the past, can be eliminated, and the eccentricity between the surfaces of the molded lens can be stabilized, and a device with good transferability can be provided. It is possible to obtain a molded lens in which the eccentricity between the lens surfaces is secured with high precision while greatly reducing the work efficiency and improving the working efficiency.

[Brief description of the drawings]

1 to 4 show a first embodiment, FIG. 1 is a partially cutaway sectional view, FIG. 2 is a partially cutaway sectional view during mold replacement,
FIG. 3 is a partially cutaway sectional view at the end of the process, and FIG. 4 is a partially cutaway sectional view of a state in which a glass lens is being formed. FIG. 5 is a partially cutaway sectional view of the second embodiment, and FIG. 6 is a plan view showing an arrangement relationship of the upper and lower dies. 1 Upper die 2 Rotating shaft 3 Upper rotary disk 15 Lower die 18 Lower rotary disk 25 Processing axis

Claims (1)

(57) [Claims] 1. A press forming die having a desired lens forming surface at a tip thereof is provided on each of upper and lower mold rotating disks in a concentric circle centered on a rotation axis of the mold rotating disk, and a glass material is formed. An apparatus for forming a glass lens, wherein the central axes of a pair of upper and lower press forming dies in the press forming dies at the time of pressing are arranged on the axis of the press forming axis.