JP2010280519A - Molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique wherein both of heating efficiency and cooling efficiency of a molding base material or a mold can be achieved and various molding conditions can be set. <P>SOLUTION: A lower mold receiving member 13 and an upper mold holding member 14 having a ring shape and large coefficient of thermal expansion are coaxially arranged respectively around the shaft tip end face 10a of in contact with the back surface 11b of a lower mold 11 of a lower press shaft 10 and around the shaft tip end face 8a in contact with the back surface 16b of an upper mold 16 of an upper press shaft 8 to form a part of the shaft tip face. When a glass material 19 is held between the lower mold 11 and the upper mold 16 and heated, the lower mold receiving member 13 and the upper mold holding member are expanded to form a gap g and then the lower mold 11 and the upper mold 16 are insulated respectively from the lower press shaft 10 and the upper press shaft 8 to improve the heating efficiency, and in cooling, the lower mold 11 and the upper mold 16 are in close contact with the lower press shaft 10 and the upper press shaft 8 respectively to improve the cooling effect. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a molding apparatus.

  For example, as a technique for manufacturing a molded product such as an optical lens by press molding, a molding apparatus disclosed in Patent Document 1 is known.

  That is, in Patent Document 1, a glass substrate to be molded is disposed between a pair of upper and lower molds opposed in the vertical direction, a lamp unit for heating the glass substrate is disposed around the mold, and A molding apparatus having a configuration in which an upper press shaft and a lower press shaft are connected to the back side of each of a pair of upper and lower molds via an upper heat insulating shaft and a lower heat insulating shaft is disclosed.

  And a glass substrate is shape | molded by pressing with a vertical press axis | shaft so that it may clamp between a pair of upper and lower molds, heating a glass substrate.

  And in patent document 1, while letting an inert gas distribute | circulate and cool to an up-and-down heat insulation axis | shaft and an up-and-down press axis | shaft, it is elastically deformed between each back of each upper and lower pair metal mold | die, and each of an upper and lower heat insulation shaft. By arranging a possible graphite sheet, the parallelism of the pair of upper and lower molds is corrected and the heat insulating effect between the two is enhanced.

  However, the configuration of the conventional molding apparatus of Patent Document 1 described above has the following technical problems.

  That is, when heating a mold sandwiching a glass substrate with the lamp unit as in the above-described prior art, it is efficient to prevent heat dissipation due to heat conduction through the upper and lower press shafts and glass. It becomes important from the viewpoint of heating the substrate, and in the case of Patent Document 1, an upper and lower heat insulating shaft and a graphite sheet are arranged to obtain a heat insulating effect.

  However, even if the upper and lower heat insulating shafts and the graphite sheet are arranged on the rear surface of the upper and lower molds, the upper and lower heat insulating shafts and the graphite sheet are always in contact with the upper and lower molds. There is a technical problem that the heat obtained by the mold is taken away by the press shaft side, the temperature raising efficiency is lowered, and the time required for heating to the target temperature is increased.

  In addition, since the heat of the mold is taken away by the press shaft, there is a technical problem that it is difficult to set various molding conditions because fine temperature control of the mold and the glass substrate cannot be performed. It was.

  In order to solve the above technical problem, for example, it is conceivable to reduce the contact area between the press shaft and the mold. When such a configuration is adopted, the mold is cooled. This causes another technical problem that the amount of heat taken away from the mold by the press shaft is reduced and cooling efficiency is lowered.

  Moreover, in the structure of patent document 1, the heat insulation axis | shaft and graphite sheet which were provided for heat insulation between a metal mold | die and a press axis | shaft become a factor of a heat dissipation path | route at the time of cooling, and become a factor which reduces cooling efficiency.

JP 2008-137836 A

  An object of the present invention is to provide a molding technique capable of achieving both the improvement of heating efficiency and cooling efficiency of a molding material and a mold and realizing various setting of molding conditions.

The present invention includes a first press shaft and a second press shaft that are in contact with the back surfaces of the first molding die and the second molding die facing each other with the molding material interposed therebetween, and pressurize the molding material in a clamping direction.
A part of at least one shaft end surface of the first and second press shafts in contact with each of the first and second molds is formed, and heat is higher than that of the first material of each of the first and second press shafts. A mold receiving member made of a second material having a large expansion coefficient;
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the shaping | molding technique which can improve the heating efficiency and cooling efficiency of a shaping | molding raw material and a shaping | molding die, and can implement | achieve the setting of various shaping | molding conditions can be provided.

It is sectional drawing which shows an example of a structure of the shaping | molding apparatus which is one embodiment of this invention. It is sectional drawing which illustrated an example of the effect | action of the shaping | molding apparatus which is one embodiment of this invention in process order. It is a diagram which shows an example of an effect | action of the shaping | molding apparatus which is one embodiment of this invention compared with the case of a prior art.

  In the present embodiment, as one aspect, the shaft end surface of the press shaft that contacts the back side of the mold opposite to each other with the molding material interposed therebetween is made of a material having a high thermal expansion coefficient, unlike the material of the press shaft. A mold receiving member is installed.

  Thus, in the heating process, the mold receiving member having a relatively high thermal expansion coefficient protrudes from the shaft end surface and comes into contact with the back surface of the mold, so that there is a gap between the shaft end surface of the press shaft and the back surface of the mold. As a result, the contact area (that is, the heat transfer area) can be reduced, and the amount of heat taken away from the mold by the press shaft can be reduced.

  As a result, the heating efficiency is improved, the time required for heating to the target temperature of the mold and the like can be shortened, the responsiveness and control accuracy of the temperature change of the mold to the heating operation are improved, and the mold and molding material are fine. Temperature control is possible.

  Also, at the time of cooling, the mold receiving member contracts and the back surface of the molding die and the shaft end surface of the press shaft are in contact with each other, and the contact area between the molding die and the press shaft is increased to increase the heat dissipation effect via the press shaft. A large cooling effect can be obtained with high efficiency.

That is, it is possible to obtain an energy saving effect by efficiently heating and cooling the mold. Furthermore, since the temperature of the mold can be finely controlled, the molding conditions can be set in various ways, and the performance of the equipment is improved.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the following description of the present embodiment, in each figure, the X, Y, and Z directions are as shown in the figure, the left-right direction is the X direction, the up-down direction is the Z direction, and the direction perpendicular to the page is the Y direction. Will be described. As an example, the Z direction is the vertical direction, and the XY plane is the horizontal plane.
FIG. 1 is a cross-sectional view showing an example of the configuration of a molding apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of the operation of the molding apparatus according to an embodiment of the present invention in the order of steps.
FIG. 3 is a diagram showing an example of the operation of the molding apparatus according to an embodiment of the present invention in comparison with the case of the prior art.

  As illustrated in FIG. 1, the lens molding device 1 (molding device) of the present embodiment includes a horizontal lower base 2 on which a molding unit 7 is placed. Four struts 3 are erected in the Z direction, and the upper base 4 is supported horizontally at the upper end portion of the struts 3.

The upper base 4 is provided with a press mechanism 5 for applying a thrust in the Z direction to an upper press shaft 8 (second press shaft), which will be described later, of the molding unit 7 to move up and down.
The press mechanism 5 includes, for example, a cylinder that generates a thrust on the upper press shaft 8 with fluid pressure, a servo motor that converts a rotational displacement into a linear displacement and generates a thrust on the upper press shaft 8, and the like.

  The press mechanism 5 is connected to a control unit 6 configured by an information processing apparatus or the like, and is configured to control the lifting / lowering operation of the upper press shaft 8 by the press mechanism 5.

  The molding portion 7 disposed on the lower base 2 has a structure that forms a sealed space by a floor base 7a, a right base 7b, a left base 7c, a ceiling base 7d, and a front base and a back base that are not shown. Yes. The floor base 7 a is fixed on the lower base 2.

In the center of the ceiling base 7d, a shaft hole 7e for passing an upper press shaft 8 described later in the Z direction is formed penetrating in the Z direction.
A seal member (not shown) is provided in the gap between the shaft hole 7e and the upper press shaft 8 so that the airtightness of the molding portion 7 is maintained.

  For example, an atmosphere replacement mechanism 9 that performs an operation of supplying an inert gas is connected to the through hole 7b-1 of the right base 7b of the molding unit 7, and when the inside of the molding unit 7 is heated, the molding unit 7 is heated. It is possible to form a low oxygen atmosphere by supplying an inert gas into the interior of the chamber for replacement.

  Inside the molding part 7, a lower mold 11 (first molding mold) and an upper mold 16 (second molding mold) are arranged so that the molding surface 11a and the molding surface 16a face each other coaxially in the Z direction. 11 is supported by the lower press shaft 10 (first press shaft), and the upper die 16 is supported by the upper press shaft 8.

  That is, a lower press shaft 10 that is coaxially opposed to the upper press shaft 8 in the Z direction is fixed on the floor base 7a of the forming portion 7, and an upward shaft front end surface 10a (shaft end surface) of the lower press shaft 10 is fixed. The back surface 11b of the lower mold 11 opposite to the molding surface 11a is in contact with and supported.

  Furthermore, the back surface 11 b of the lower mold 11 is connected to the outer peripheral portion of the lower press shaft 10 by fitting and connecting to the outer peripheral portions of the lower press shaft 10 and the lower die 11. It has a cylindrical lower mold holding member 12 for holding in a state where it is applied to.

  In other words, the lower mold 11 is held via the lower mold holding member 12 so that the back surface 11 b comes into contact with the shaft tip surface 10 a of the lower press shaft 10.

  In the case of the present embodiment, a reduced diameter portion 10c is provided coaxially on the shaft tip surface 10a of the lower press shaft 10, and the reduced diameter portion 10c includes the first material (linear expansion coefficient α1) of the lower press shaft 10. ), A ring-shaped lower mold receiving member 13 (mold receiving member) made of a second material (linear expansion coefficient α2) having a large thermal expansion coefficient is coaxially fitted and arranged, and has a linear expansion coefficient α1. <Linear expansion coefficient α2.

The lower mold holding member 12 that holds the lower mold 11 on the lower press shaft 10 is also made of the same second material as the lower mold receiving member 13.
That is, the inner diameter of the lower mold receiving member 13 is substantially equal to the outer diameter of the reduced diameter portion 10 c of the lower press shaft 10, and the outer diameter of the lower mold receiving member 13 is set substantially equal to the outer diameter of the back surface 11 b of the lower mold 11. Has been.

  Further, the length of the ring-shaped lower mold receiving member 13 in the axial direction (Z direction), that is, the ring front end surface 13a (axial end surface) which is the end surface facing the back surface 11b of the lower mold 11 of the lower mold receiving member 13 and The distance from the opposite base end surface 13b contacting the stepped portion of the reduced diameter portion 10c is set equal to the height in the Z direction of the stepped portion of the reduced diameter portion 10c at room temperature.

Thereby, at normal temperature, the shaft tip surface 10a of the lower press shaft 10 and the annular ring tip surface 13a of the lower mold receiving member 13 fitted coaxially to the shaft tip surface 10a are simultaneously formed on the back surface of the lower die 11. 11b.
That is, the annular ring front end surface 13a of the lower mold receiving member 13 constitutes a part of the shaft end surface of the lower press shaft 10 in contact with the back surface 11b of the lower mold 11 together with the shaft front end surface 10a of the lower press shaft 10. ing.

Further, in the case of the present embodiment, the area of the annular ring front end surface 13a of the lower mold receiving member 13 is set to be smaller than the area of the shaft front end surface 10a of the center lower press shaft 10.
That is, the ring front end surface 13a is made as small as possible with respect to the shaft front end surface 10a as long as the lower mold receiving member 13 has a strength that can withstand the press pressure alone.

  In the present embodiment, the lower mold receiving member 13 is described as an example of a ring shape, but the area of the ring front end surface 13a of the lower mold receiving member 13 in contact with the back surface 11b of the lower mold 11 is Any shape may be used as long as it is smaller than the area of the shaft tip surface 10a of the lower press shaft 10.

  Thereby, in the case of the present embodiment, when the temperature of the molding part 7 rises from the normal temperature, the lower mold holding member 12 and the lower mold receiving member 13 are thermally expanded more than the lower press shaft 10. The back surface 11b is displaced so as to form a gap g away from the shaft tip surface 10a.

  In addition, a flow path 10b through which a cooling medium flows for cooling is provided in the central portion of the lower press shaft 10, and the flow path 10b is formed at an end opposite to the shaft tip surface 10a. It opens and is connected to a cooling medium supply mechanism (not shown) provided outside through the through hole 7a-1 of the floor base 7a and the through hole 2a of the lower base 2.

On the other hand, the base end portion opposite to the shaft tip surface 8a (shaft end surface) that supports the upper die 16 of the upper press shaft 8 that is coaxially opposed to the lower press shaft 10 is connected to the press mechanism 5 described above. The press mechanism 5 moves the upper press shaft 8 and the upper die 16 up and down in the Z direction.
The support structure of the upper die 16 in the upper press shaft 8 is the same as that of the lower press shaft 10 described above.

That is, an upper die holding member 14 that holds the upper die 16 in contact with the shaft tip surface 8 a of the upper press shaft 8 is provided on the outer peripheral portion of the upper press shaft 8.
Further, a ring-shaped upper mold receiving member 15 (mold receiving member) is coaxially mounted on the reduced diameter portion 8 c of the shaft front end surface 8 a of the upper press shaft 8.

The distance between the ring front end surface 15a (shaft end surface) and the base end surface 15b of the upper mold receiving member 15 is set to be substantially equal to the length in the Z direction of the stepped portion of the reduced diameter portion 8c of the upper press shaft 8 at room temperature. The shaft tip surface 8 a and the ring tip surface 15 a are in contact with the back surface 16 b of the upper mold 16.
That is, the annular ring front end surface 15 a of the upper mold receiving member 15 constitutes a part of the shaft end surface of the upper press shaft 8 that contacts the back surface 16 b of the upper mold 16 together with the shaft front end surface 8 a of the upper press shaft 8. ing.

  The upper mold receiving member 15 and the upper mold holding member 14 are also made of the same second material as the lower mold holding member 12 and the lower mold receiving member 13, and have a thermal expansion coefficient higher than that of the upper press shaft 8 made of the first material. It is getting bigger.

For this reason, when the temperature of the molding part 7 rises from room temperature, the back surface 16b of the upper die 16 is separated from the shaft tip surface 8a of the upper press shaft 8 due to thermal expansion of the upper die receiving member 15 and the upper die holding member 14. Thus, the gap g is formed between the back surface 11b and the shaft tip surface 8a.
Further, as in the case of the lower mold receiving member 13 described above, the ring front end surface 15a is possible with respect to the shaft front end surface 8a as long as the upper mold receiving member 15 has a strength capable of withstanding the press pressure alone. It is as small as possible.

  A flow path 8b through which a cooling medium flows is formed in the central portion of the upper press shaft 8 in the axial direction. This flow path 8b opens outside the ceiling base 7d and is provided outside (not shown). The cooling medium supply mechanism is connected.

A sleeve 17 is disposed outside the lower die 11 and the upper die 16 that are supported by the lower press shaft 10 and the upper press shaft 8 so as to face each other in the Z direction so as to surround them.
The sleeve 17 is made of, for example, transparent quartz glass.

  Further, around the sleeve 17, for example, a heating unit 18 including a lamp 18 a and a reflecting plate 18 b arranged on the back side of the lamp 18 a is arranged.

  Then, the radiant heat radiated from the lamp 18 a of the heating unit 18 is guided by the reflector 18 b so as to be concentrated and irradiated on the sleeve 17 side, and the lower mold 11 and the upper mold 16 are heated by the radiant heat transmitted through the sleeve 17. Is done.

  The heating unit 18 is connected to the control unit 6 provided outside the molding unit 7 and can control the heating temperature of the lower mold 11 and the upper mold 16.

Here, in the case of the present embodiment, as an example, the first material (linear expansion coefficient α1) constituting the lower press shaft 10 and the upper press shaft 8 is, for example, stainless steel (α1≈10.0 to 17.6). × 10 ⁻⁶ / ° C.) as the second material (linear expansion coefficient α 2) constituting the lower mold holding member 12, the lower mold receiving member 13, the upper mold holding member 14, and the upper mold receiving member 15, for example Aluminum (α2≈23 × 10 ⁻⁶ / ° C.) can be used.

Further, when the first material constituting the lower press shaft 10 and the upper press shaft 8 is, for example, ceramics such as alumina (α1≈7.1 × 10 ⁻⁶ / ° C.), the lower mold holding member 12, As the second material constituting the mold receiving member 13, the upper mold holding member 14, and the upper mold receiving member 15, for example, stainless steel (α2≈10.0 to 17.6 × 10 ⁻⁶ / ° C.) can be used. .

  Next, an example of the operation of the lens molding device 1 according to the present embodiment will be described with reference to FIGS.

  In FIG. 3, the horizontal axis represents time, the vertical axis represents the gap g and the heating temperature by the heating unit 18, and the temperature / gap profile P0 in the present embodiment is illustrated by a solid line. For comparison, A temperature / gap profile P1 in the prior art as in Patent Document 1 is indicated by a broken line.

2 illustrates the states of the lower mold 11 and the upper mold 16 in the glass material supply process S1, the heating-press molding process S2, and the cooling process S3 in order of processes from the left side.
First, the controller 6 supplies the glass material 19 (molding material) between the lower mold 11 and the upper mold 16 at room temperature, as illustrated in the glass material supply step S1 of FIG.

At this time, on the lower mold 11 side, the back surface 11 b of the lower mold 11 is in contact with the shaft front end surface 10 a of the lower press shaft 10 and the ring front end surface 13 a of the lower mold receiving member 13.
Similarly, on the side of the upper mold 16, the back surface 16 b of the upper mold 16 is in contact with the shaft front end surface 8 a of the upper press shaft 8 and the ring front end surface 15 a of the upper mold receiving member 15. That is, the gap g = 0.

Thereafter, the control unit 6 turns on the lamp 18a of the heating unit 18 to heat the lower mold 11, the upper mold 16, and the glass material 19, as in the heating-press molding step S2 of FIG.
At this time, the shaft front end surface 10a of the lower press shaft 10, the shaft front end surface 8a of the upper press shaft 8, and the lower mold receiving member 13 and the upper mold receiving member 15 mounted on each of them are also heated simultaneously.

  Since the heated lower mold receiving member 13 and the upper mold receiving member 15 are thermally expanded in the Z direction larger than the lower press shaft 10 and the upper press shaft 8, the ring front end surface 13a and the upper mold receiving surface 13 of the lower mold receiving member 13 are The ring front end surface 15 a of the mold receiving member 15 protrudes from the shaft front end surface 10 a of the lower press shaft 10 and the shaft front end surface 8 a of the upper press shaft 8.

As a result, the lower die 11 and the upper die 16 are pushed away from the shaft tip surface 10a and the shaft tip surface 8a of the lower press shaft 10 and the upper press shaft 8 to form a gap g.
Further, as illustrated in FIG. 3, the gap g gradually increases while the temperature is raised to the target molding temperature Ts, and reaches a maximum value g _max at the molding temperature Ts.

  For this reason, the contact (that is, the heat transfer path) between the shaft tip surface 10a and the shaft tip surface 8a of the lower press shaft 10 and the upper press shaft 8 and the back surface 11b and the back surface 16b of the lower die 11 and the upper die 16 is cut off. The lower die 11 and the upper die 16 are in a heat-insulated state on the shaft tip surface 10a, the lower die receiving member 13 having a smaller area than the shaft tip surface 8a, and the ring tip surface 13a and the ring tip surface 15a of the upper die receiving member 15. Heated.

  In the case of the conventional technique, the mold and the press shaft remain in close contact regardless of the heating temperature, and the gap g = 0 is always maintained.

  Then, when the glass material 19 reaches the target molding temperature Ts, the control unit 6 operates the press mechanism 5 to lower the upper press shaft 8 and the upper mold 16, so that the molding surface 11 a of the lower mold 11 and the upper mold 16 are moved. The glass material 19 is clamped between the molding surface 16a and plastically deformed, and the molding surface 11a and the molding surface 16a are transferred to the glass material 19 and molded into the optical element 19a (heating-press molding process). S2).

  In this case, as an example, the optical element 19a is a meniscus lens.

  As described above, in the case of the present embodiment, the contact surfaces of the lower mold 11 and the upper mold 16 with the lower press shaft 10 and the upper press shaft 8 are reduced during heating. The amount of heat transferred to the lower press shaft 10 and the upper press shaft 8 from the heat is reduced as much as possible, and the lower mold 11 and the upper mold 16 are efficiently heated to the target temperature (in this case, the molding temperature Ts) by the heating unit 18. The effect that it can be made.

  In other words, as illustrated in FIG. 3, the heating period th0 of the present embodiment necessary for heating the lower mold 11 and the upper mold 16 to the molding temperature Ts is shorter than the heating period th1 of the prior art. Thus, productivity can be improved by shortening the molding cycle of each glass material 19.

  Furthermore, the heating object of the heating unit 18 is substantially only the lower mold 11, the upper mold 16, and the glass material 19, and also has a heat capacity corresponding to the lower press shaft 10 and the upper press shaft 8 that are thermally separated by the gap g. Therefore, the responsiveness of the temperature change of the lower mold 11, the upper mold 16, and the glass material 19 with respect to the heat input from the heating unit 18 is improved, and the followability to the temperature control by the heating unit 18 can be improved.

  As a result, the heating rate and the cooling rate of the glass material 19 by the heating unit 18 can be delicately and variously set, and the glass material 19 can be molded under various molding conditions.

  The controller 6 starts the next cooling step S3 (cooling period tc) after maintaining the optical element 19a at the predetermined molding temperature Ts and the press pressure for a predetermined time in the heating-press molding step S2.

  That is, when cooling the lower mold 11 and the upper mold 16, the control unit 6 stops heating by the heating unit 18, and the flow path 10 b and the flow path 8 b applied to the lower press shaft 10 and the upper press shaft 8. The cooling medium is supplied to the lower press shaft 10 and the upper press shaft 8 is cooled.

  In this cooling period tc, the lower press shaft 10 and the upper press shaft 8 are cooled, so that the lower mold receiving member 13 (lower mold holding member 12) and the upper mold receiving member 15 (upper mold holding) provided on these shafts are cooled. The member 14) is also cooled at the same time and contracts in the Z direction, and the gap g decreases as the temperature drops, and the back surface 11b of the lower die 11 and the back surface 16b of the upper die 16 and the shaft tips of the lower press shaft 10 and the upper press shaft 8 The surface 10a and the shaft tip surface 8a are in contact with each other.

  As a result, the heat of the lower mold 11 and the upper mold 16 is cooled by the cooling medium by heat conduction via the shaft tip surface 10a and the shaft tip surface 8a having a large area in addition to the ring tip surface 13a and the ring tip surface 15a. It is transmitted to the lower press shaft 10 and the upper press shaft 8 that are efficiently taken away, and the time required for cooling to a predetermined temperature can be shortened, and a cooling effect similar to that of a conventional lens molding apparatus can be obtained.

  Then, after the optical element 19a is cooled to a predetermined temperature, the control unit 6 raises the upper press shaft 8, separates the upper mold 16 from the lower mold 11, and takes out the molded optical element 19a to the outside. .

  As described above, according to the lens molding apparatus 1 of the present embodiment, it is difficult for the prior art to control the heat insulating effect by the gap g between the lower mold 11 and the lower press shaft 10 and the upper mold 16 and the upper press shaft 8. Thus, efficient heating of the lower mold 11 and the upper mold 16 by the heating unit 18 and efficient cooling can be achieved at the same time.

  That is, as illustrated in FIG. 3, the temperature profile of the temperature / gap profile P0 of the present embodiment is on the left side of the temperature / gap profile P1 in the case of the prior art (that is, the side where the molding time is shorter). It can be seen that the time required for molding the optical element 19a is shortened.

  Moreover, the heat capacity can be reduced by substantially limiting the portion to be heated by the heating unit 18 to the lower mold 11, the upper mold 16, and the glass material 19 due to the heat insulating effect due to the gap g. It is possible to save energy by reducing the amount of energy to be saved.

  Further, since the heating target part is substantially limited to the lower mold 11, the upper mold 16, and the glass material 19, the responsiveness of the temperature change corresponding to the heating from the heating unit 18 is improved, and the temperature control of the glass material 19 is performed. Therefore, the molding conditions of the glass material 19 can be set in various ways, and the performance of molding equipment such as the lens molding apparatus 1 can be improved.

That is, according to the embodiment of the present invention, it is possible to provide a molding technique capable of achieving both the improvement of the heating efficiency and the cooling efficiency of the molding material and the mold and realizing the setting of various molding conditions. .
Needless to say, the present invention is not limited to the configuration exemplified in the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, the first material (linear expansion coefficient α1) of the lower press shaft 10 and the upper press shaft 8, and the second material of the lower mold holding member 12, the lower mold receiving member 13, the upper mold holding member 14, and the upper mold receiving member 15 (Linear expansion coefficient α2) is not limited to the materials exemplified in the above embodiment, and any combination of materials satisfying the relationship of linear expansion coefficient α1 <linear expansion coefficient α2 can be used.

(Appendix 1)
A heating unit for heating the lens material between a pair of molds;
A press mechanism that presses and presses a pair of molds;
A mold mounting shaft (hereinafter referred to as a press shaft) on which the pair of molding dies can be mounted and a path for flowing a cooling medium is provided;
In a lens molding machine having an atmosphere replacement mechanism that generates a low oxygen atmosphere during heating,
A lens molding apparatus, wherein a mold receiving member made of a different material having a higher thermal expansion coefficient than a material of a press shaft is mounted on an end surface of the press shaft.

(Appendix 2)
The lens receiving apparatus according to appendix 1, wherein the mold receiving member has a structure in which a contact area with the mold is smaller than an end surface of the press shaft.

DESCRIPTION OF SYMBOLS 1 Lens shaping | molding apparatus 2 Lower base 2a Through-hole 3 Strut 4 Upper base 5 Press mechanism 6 Control part 7 Molding part 7a Floor base 7a-1 Through-hole 7b Right base 7b-1 Through-hole 7c Left base 7d Ceiling base 7e Shaft hole 8 Upper press shaft 8a Shaft tip surface 8b Channel 8c Reduced diameter portion 9 Atmosphere replacement mechanism 10 Lower press shaft 10a Shaft tip surface 10b Channel 10c Reduced diameter portion 11 Lower mold 11a Molded surface 11b Rear surface 12 Lower mold holding member 13 Lower mold holder Member 13a Ring distal end surface 13b Base end surface 14 Upper mold holding member 15 Upper mold receiving member 15a Ring distal end surface 15b Base end surface 16 Upper mold 16a Molding surface 16b Rear surface 17 Sleeve 18 Heating unit 18a Lamp 18b Reflector plate 19 Glass material 19a Optical element P0 Temperature / gap profile P1 Temperature / gap profile S1 Glass material supply step S2 Heating-press molding step S3 Cooling Process g Clearance

Claims (5)

A first press shaft and a second press shaft that are in contact with the back surfaces of the first molding die and the second molding die facing each other with the molding material interposed therebetween, and pressurize the molding material in a direction to sandwich the molding material;
A part of at least one shaft end surface of the first and second press shafts in contact with each of the first and second molds is formed, and heat is higher than that of the first material of each of the first and second press shafts. A mold receiving member made of a second material having a large expansion coefficient;
A molding apparatus comprising: The molding apparatus according to claim 1,
The contact area of the mold receiving member with respect to the first and second molds is smaller than the contact area of the shaft end surfaces of the first and second press shafts with respect to the first and second molds. Molding equipment. In the shaping | molding apparatus of Claim 1 or Claim 2,
The molding apparatus is characterized in that the mold receiving member has a ring shape that fits into the outer peripheral portion of the shaft end surface. In the shaping | molding apparatus of Claim 1 or Claim 2,
A heating section for heating the molding material positioned between the first and second molds in a non-contact manner;
An atmosphere replacement mechanism for replacing the atmosphere of the molding material sandwiched between the first and second molding dies with a low oxygen atmosphere;
A molding apparatus characterized by further comprising: In the shaping | molding apparatus of Claim 1 or Claim 2,
The first and second press shafts are provided with flow paths through which a cooling medium circulates.