JP3002935U - Glass mold press - Google Patents

Abstract

(57) [Summary] [Objective] To provide a glass mold press capable of shortening the time required to raise the temperature of a glass material which is a base of a lens. In a glass mold press in which one of an upper mold and a lower mold for a glass mold is a fixed mold and the other is a movable mold that is brought into contact with and separated from the fixed mold, a fixed mold support member (11) is used.
0) and a cylindrical member (116) slidably provided on the outer periphery thereof;
The tubular shape is provided with an engaging portion (120b) provided on the outer periphery of the movable support member (120) into which the tubular member can be fitted; and an actuator (118) for sliding the tubular member. In the molding state in which the movable die is brought closer to the fixed die, the member is slid to the movable die side by the operation of the actuator and fitted into the engaging portion, and the outside air is provided between the fixed die and the movable die. A glass mold press that forms a closed chamber against.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a glass mold press for molding an aspherical lens by a press using an upper mold and a lower mold.

[0002]

[Prior art and its problems]

 Glass mold presses are widely used for molding aspherical glass lenses. In this glass mold press, the glass material that is the source of the lens is sandwiched between the cores provided in the upper mold and the lower mold, and the temperature of the core is raised by a heater to soften the glass material and move it upward. A lens is formed by gradually approaching a fixed mold (or lower mold) to a fixed lower mold (or upper mold) to a predetermined position and pressing the softened glass material. After the pressing, the cores of the upper mold and the lower mold are cooled, and after the cooling work, the upper mold and the lower mold are separated from each other and the lens is taken out.

In this conventional glass mold press, it takes a relatively long time from the start of heating the core to the temperature at which the glass material softens during the pressing work. Although it was possible to improve efficiency, there was no glass mold press that could shorten this time. For this reason, the advent of a glass mold press that can reduce the time required to raise the temperature of the glass material has been desired.

Further, since the core is heated to a high temperature (500 ° C. to 600 ° C. or higher) by the heater, the core and the member made of a metal material provided around the core are easily oxidized. However, in the conventional glass mold press, there was no good solution to this problem.

[0005]

[The purpose of the device]

 The present invention has been made in view of the conventional problems described above, and an object of the present invention is to provide a glass mold press capable of shortening the time required to raise the temperature of the glass material that is the source of the lens.

Another object of the present invention is to provide a glass mold press capable of preventing oxidation of a core and a member made of a metal material provided around the core.

[0007]

[Outline of the device]

 The present invention is a glass mold press in which one of the upper mold and the lower mold for the glass mold is a fixed mold, and the other is a movable mold that is brought into contact with and separated from the fixed mold. A tubular member provided; an engaging portion provided on the outer periphery of the movable support member, into which the tubular member can be fitted; an actuator for sliding the tubular member; In a molding state in which the movable die is brought closer to the fixed die, the actuator is operated to slide the movable die to the engaging portion, and the fixed die and the movable die are exposed to the outside air. It is characterized by forming a closed small chamber.

Further, the glass mold press of the present invention is further characterized in that a gas supply means for filling an inert gas in the space inside the glass mold press is provided.

[0009]

【Example】

 The present invention will be described below with reference to illustrated embodiments. 1 is a vertical sectional view of a glass mold press 10 to which the present invention is applied, and FIG. 2 is a plan view of the press 10. This glass mold press 10 includes a press working part 100 fixed to the center of an upper part of a base 11, a lens elevating part 200 fixed to the base 11 adjacent to the press working part 100, and a lens elevating and lowering part. The lens carry-in / carry-out section 300 is provided near the section 200 and fixed on the base 11.

The press working unit 100 uses a glass material (hereinafter referred to as a “workpiece”), which is carried in by the lens carrying-in / carrying-out unit 300 and is formed as a lens, to have an upper die (having a movable core) and a lower core 13 (movable). A lens is formed by press working using a mold) U and a lower mold (fixed mold) D. The lens elevating / lowering unit 200 performs an operation of feeding a workpiece supplied from the outside of the glass mold press 10 into the press 10 and an operation of taking out a molded workpiece (molded lens) from the inside of the press 10 to the outside. To do. The lens loading / unloading section 300 carries in an operation of loading the workpiece, which is fed into the press 10 by the lens elevating / lowering section 200 and is located at a predetermined position, into the press processing section 100, and unloads the molded lens from the press processing section 100. Then, the operation for returning to the predetermined position is performed.

The pressing section 100, the lens elevating section 200, and the lens loading / unloading section 300 will be described in detail below. First, the press working unit 100 will be described. The press processing unit 100 has a support substrate 150 provided in parallel with the base 11, and the upper mold U is suspended from the support substrate 150 via the engagement block unit 140. A lower die D is provided on the base 11 so as to face the upper die U. The space A including the upper mold U and the lower mold D is surrounded by the casing member 101 fixed to the base 11 and is isolated from the external space of the glass mold press 10.

The upper die U has a substantially cylindrical upper core support member (movable die support member) 120 fixed to the sliding member 135. The upper core support member 120 includes an upper core 12 protruding from an opening 120a formed in a lower portion, a stopper 121 interposed between the opening 120a and the upper core 12, and an end portion of the upper core supporting member 120 placed on the upper core 12. The attached heat conducting core 122 and the heater 123 for heating the heat conducting core 122 are housed. The upper mold U further includes a driven pressure member 130 fixed to the engagement block portion 140, and a sliding member 135 supported by the driven pressure member 130 and capable of moving up and down with respect to the casing member 101. .

On the other hand, the lower die D has a substantially cylindrical lower core support member (fixed die support member) 110 fixed to the bottom portion 101 a of the casing member 101. The lower core supporting member 110 includes a lower core 13 protruding from an opening 110a formed in the upper portion and facing the upper core 12, a stopper 111 interposed between the opening 110a and the lower core 13, and an upper end. The heat conducting core 112, which is attached to the lower core 13, and the heater 113 for heating the heat conducting core 112 are housed. The stopper 111 can contact a corresponding stopper 121 provided around the upper core 12, and the stopper 111, 121 determines the closest position of the upper core 12 to the lower core 13. There is.

The heat conductive cores 122 and 112 are made of a heat transfer material such as ceramic or metal material. The heaters 123 and 113, which are heating wires, raise the temperature of the upper core 12 and the lower core 13, respectively, so that the temperature of the upper core 12 and the lower core 13 is always set to an arbitrary set temperature when the press 10 is used. Control.

A temperature sensor 114 is provided at the center of the heat conducting core 112. The temperature sensor 114 has a sensor portion at the upper end reaching the inside of the lower core 13, and detects the temperature of the lower core 13. The sensor 114 is connected to a temperature controller (not shown). This temperature controller is connected to a thyristor (not shown) and controls the heater 113. Further, the heat conduction core 112 has a plurality of communication passages 115 that communicate from the lower end of the lower core 13 to the upper end thereof. Nitrogen gas (inert gas) is supplied from the lower end side to the plurality of communication passages 115, and the nitrogen gas flowing out from the upper end is sent to above the lower core 13. By supplying this nitrogen gas, the lower core 13 can be cooled. In the figure, the supply source of nitrogen gas is not shown.

A temperature sensor 124 is provided at the center of the heat conducting core 122. The temperature sensor 124 has a lower end sensor portion reaching the inside of the upper core 12, and detects the temperature of the upper core 12. Like the sensor 114, the sensor 124 is also connected to a temperature controller (not shown). This temperature controller is connected to a thyristor (not shown) and controls the heater 123. Further, the heat conduction core 122 is provided with a plurality of communication passages 125 communicating from the upper end to the lower end of the core portion. Nitrogen gas is supplied to the plurality of communication passages 125 from the upper end side, and nitrogen gas flowing out from the lower end is sent to the lower side of the upper core 12. By supplying this nitrogen gas, the upper core 12 can be cooled. In the figure, the supply source of nitrogen gas is not shown.

On the outer periphery of the lower core support member 110, a cylindrical member 116 having an inner peripheral surface in contact with the peripheral surface of the lower core support member 110 and slidable in the vertical direction (vertical direction in the figure). Is set up. The tubular member 116 is connected to a pneumatic cylinder (actuator) 118 via a connecting arm 117, and is moved up and down by driving the pneumatic cylinder 118. When the tubular member 116 is lifted by the pneumatic cylinder 118 in a state in which the upper core 12 has approached the lower core 13 by a predetermined amount or more (two-dot chain line B in FIG. 4), the upper and lower portions of the tubular member 116 are , The upper core supporting member 120 for supporting the upper core 12 and the outer peripheral lower portion (engaging portion) 120b of the upper core supporting member 120 and the outer peripheral upper portion 110b of the lower core supporting member 110, respectively. The constant space is surrounded by the tubular member 116. That is, a constant space surrounded by the tubular member 116 between the upper core 12 and the lower core 13 is formed as a small chamber closed to the space A outside the space.

Further, in the casing member 101, a temperature sensor 119 protruding upward from the bottom portion 101a is provided. The temperature sensor 119 is for detecting the temperature in the space A.

As shown in FIG. 8, the driven pressure member 130 located above the casing member 101 has a plurality of guide shafts 131 and a support mount portion 132 slidably supporting the guide shafts 131. It is supported by a linear guide mechanism 133 so as to be movable in the vertical direction. A guide hole 132a extending vertically is formed in the support mount portion 132, and a guide shaft 131 having an upper portion fixed to the driven pressure member 130 is slidably inserted into the guide hole 132a. Further, a dial gauge 134 with the tracing stylus 134a extending downward is fixed to the driven pressure member 130. The tracing stylus 134a is in contact with the upper end of the plate 129 fixed to the support mount portion 132. Therefore, the position of the driven pressure member 130 in the vertical direction with respect to the support mount portion 132, that is, the position of the upper mold U with respect to the lower mold D in the vertical direction can be confirmed by the dial gauge 134.

The sliding member 135 is connected to a lower portion of the driven pressure member 130 via a connecting bolt 130a or the like. The sliding member 135 is formed in a substantially cylindrical shape, and integrally includes a wall portion 136 extending vertically downward from a peripheral edge portion thereof. An opening 137 is formed in the upper portion of the casing member 101, and the wall 136 is opened with the outer peripheral surface 136a of the wall 136 slidable in the vertical direction with respect to the edge 137a of the opening 137. It is fitted in 137. An annular packing 139 is fitted in the annular recess 138 formed on the inner circumference of the edge portion 137a in the circumferential direction. The annular packing 139 seals a gap between the edge portion 137a and the wall portion 136 by slidingly contacting the wall portion 136.

The engaging block portion 140 is fixed to the center of the upper surface of the driven pressure member 130. As shown in FIGS. 4 and 10, the engagement block portion 140 has a pressure plate 141, a lower plate 143, and an upper plate 145 placed on the upper surface of the driven pressure member 130. The upper plate 145 and the upper plate 143 are fixed to the driven pressure member 130 by a plurality of bolts 142. Holes 145a and 143a are formed in the upper plate 145 and the lower plate 143 at the same position in the vertical direction. The engagement block portion 140 engages with the lower end portion of the moving shaft 164 that moves up and down. The engagement relationship between the engagement block 140 and the moving shaft 164 will be described later in detail.

Above the driven pressure member 130, a support substrate 150 positioned parallel to the base 11 is provided. The support substrate 150 is supported by a pair of leg plates 151 fixed on the base 11. The upper ends of the pair of leg plates 151 are appropriately fixed to the support base plate 150.

As shown in FIG. 9, an opening 155 is formed in a substantially central portion of the support substrate 150. A cylindrical member 156 extending upward is fixed on the support substrate 150 around the opening 155 so as to surround the opening 155. A rotating member 158 is provided inside the cylindrical member 156. The rotating member 158 is vertically rotatable about a shaft extending in the vertical direction orthogonal to the supporting substrate 150 by a pair of upper and lower rolling bearings 157 provided between the rotating member 158 and the cylindrical member 156. It is immovable in the direction.

The rotating member 158 is provided with the lower end thereof protruding downward from the opening 155, and the rotating center of the rotating member 158 and the center thereof are aligned with this lower end. The gear 160 is fixed. The large gear 160 meshes with a small gear 162 fixed to a rotation shaft 161a of a servo motor 161 fixed on the support substrate 150. Therefore, the rotating member 158 is rotated by the operation of the servo motor 161 via the small gear 162 and the large gear 160.

A female screw 163 is formed on the rotating member 158 concentrically with the rotating center and along the rotating center. A male screw 165 formed on the outer peripheral surface of a hollow moving shaft 164 is screwed into the female screw 163. The lower end of the moving shaft 164 extends below the large gear 160, and the upper end extends above the rotating member 158. A pair of regulating shafts 166 and 167 extending in the radial direction of the moving shaft 164 are fixedly provided on the upper end portion of the moving shaft 164.

The restriction shafts 166 and 167 are slidably engaged with corresponding guide grooves 168 and 169 formed in the cylindrical member 156, respectively. These guide grooves 168, 169 have a groove width slightly larger than the diameter of the regulation shafts 166, 167 and extend in the vertical direction in parallel with the moving shaft 164. Therefore, since the rotation of the moving shaft 164 is restricted by the restricting shafts 166 and 167 engaging with the guide grooves 168 and 169, when the rotating member 158 rotates, the moving shaft 164 is vertically moved by the female screw 163 and the male screw 165. Move in the direction. The female screw 163 and the male screw 165 are formed as a feed screw, and the female screw 163, the male screw 165, the regulating shafts 166 and 167, and the guide grooves 168 and 169 form a feed screw mechanism. A protrusion 170 extending outward from the cylindrical member 156 is provided at the tip of the regulation shaft 167.

A support plate 171 is fixedly provided on the cylindrical member 156 at a position facing the guide groove 169 outside the cylindrical member 156. An upper limit detection sensor 172, an origin detection sensor 173, and a lower limit detection sensor 174 are fixedly provided on the support plate 171 in order from the top. These upper limit, origin, and lower limit detection sensors 172, 173, and 174 consist of photosensors, and when the protrusion 170 reaches the detection portion of these sensors, the upper and lower limits related to the vertical movement of the moving shaft 164, and this Detect a predetermined origin between the upper limit and the lower limit. The upper limit detection sensor 172 and the lower limit detection sensor 174 are used as an overrun prevention sensor of the servo motor 161, and the original point detection sensor 173 is used as a sensor for returning to the origin of the servo motor 161. The positions of the upper limit, the origin, and the lower limit detection sensors 172, 173, 174 in the vertical direction are strictly defined.

The cylindrical member 156 has a support plate 175 fixed to the upper end thereof. A pneumatic cylinder 176 is fixedly provided on the support plate 175. The pneumatic cylinder 176 has a piston rod 177 that can move outward from the inside of the cylinder by air pressure. The piston rod 177 passes through a hole 175 a formed in the support plate 175 and vertically extends downward. The member 156 extends toward the inside. When the tip (lower end) of the piston rod 177 is extended downward from the cylinder 176 by the operation of the pneumatic cylinder 176, it pushes the upper end of the rod 180 that constitutes a fluid pressure mechanism together with the pneumatic cylinder 176. To do. The moving shaft 164 has the rod 180 slidably inserted inside a long hole 164a formed at the center of the shaft. The rod 180 is somewhat longer than the moving shaft 164, and the upper end portion 180a thereof can come into contact with the lower end portion of the piston rod 177.

As shown in FIG. 10 and FIG. 11 in an enlarged manner, in the engagement block part 140, a storage chamber 183 for storing the ring member 182 is provided between the upper plate 145 and the lower plate 143 of the ring member 182. It is formed according to the shape. The storage chamber 183 is slightly larger than the outer shape of the ring member 182, and the length of the storage chamber 183 in the vertical direction is set to be longer than the ring member 182 by a predetermined amount. The lower end portion 180b of the rod 180 extends from the inside of the moving shaft 164 and can contact the upper surface of the pressure plate 141 (FIG. 11).

The moving shaft 164 has a male screw portion 181 formed at the lower end thereof. The lower end portion of the moving shaft 164 having the rod 180 as an axial center is inserted into the holes 145a and 143a of the engagement block portion 140. A ring member 182 having a diameter larger than that of the moving shaft 164 is screwed into the male screw portion 181 of the moving shaft 164, and the ring member 182 is firmly fixed to the lower end of the moving shaft 164. The lower end of the moving shaft 164 is supported by the engagement block 140 so as not to come off.

With the above configuration, when the servo motor 161 is started so as to rotate in a predetermined rotation direction, the small gear 162, the large gear 160, the rotating member 158, and the feed screw mechanism including the female screw 163 and the male screw 165. The moving shaft 164 moves downward via the, and the driven pressure member 130 moves downward accordingly. Further, when the servo motor 161 is rotated in the reverse direction, the moving shaft 164 moves upward, and along with this, the driven pressing member 130 moves upward. The stop position of the moving shaft 164 in the vertical direction can be arbitrarily set by a control circuit (not shown) that controls the servo motor 161 with the detection position of the origin detection sensor 173 as a reference. The arbitrarily set stop position data of the moving shaft 164 is stored in the storage means (memory) provided in the control circuit, and the servo motor 161 is controlled based on the recorded data.

After the moving shaft 164 has moved to an arbitrarily set position, the pneumatic cylinder 176 can be operated to press the upper end 180 a of the rod 180 with the tip of the piston rod 177. As a result, the lower end portion 180b of the rod 180 can be pressed against the pressure plate 141. With this configuration, when the pneumatic cylinder 176 is operated, the total load (G + L) obtained by adding the additional load L by the pneumatic cylinder 176 to the own weight G of the upper mold U can be applied to the stopper 111 via the stopper 121. it can. The load L applied by the pneumatic cylinder 176 is variable by changing the amount of air supplied to the pneumatic cylinder 176. Therefore, the total load (G + L) can be set arbitrarily. For example, the weight G of the upper mold U can be set to about 18 kg and the total weight (G + L) can be set to about 60 kg.

Next, the lens elevating part 200 will be described. The lens elevating part 200 includes a cylindrical member 216, a piston rod 215 slidably fitted in the cylindrical member 216, a pneumatic cylinder 219 connected to the lower end of the piston rod 215, and these cylindrical members. 216, a piston rod 215, a pneumatic cylinder 219, etc. have a pair of lifting mechanisms 209 having a pneumatic cylinder 203 for lifting and lowering the whole. The pair of lifting mechanisms 209 are provided symmetrically with respect to the center line X of the glass mold press 10 shown in FIG. In each of FIG. 1, FIG. 3, FIG. 5, and FIG. 12, only the lifting mechanism 209 on the loading side (lower side in FIG. 2) is shown. The elevator mechanism 209 on the loading side is used to load the workpiece W into the glass mold press 10, and the lifting mechanism 209 on the unloading side (upper side in FIG. 2) is the workpiece W (molded lens) after molding. Is used to carry the product out of the glass mold press 10.

As shown in FIG. 3, an opening 102 is formed on one side of the casing member 101, and a horizontally long box body 201 is fixedly provided adjacent to the opening 102. The horizontally long box body 201 has a symmetrical shape with the center line X shown in FIG. 2 as a boundary, and the internal space C thereof communicates with the opening 102. In addition, the horizontally long box body portion 201 is positioned parallel to the base 11 in the lengthwise direction thereof, and is fixed to the base 11 via a support block 204 fixed to the lower surface of the horizontally long box body portion 201. Has been done.

The horizontally long box part 201 is paired on the lower wall 205 of the box part 201 in a direction perpendicular to the paper surface of FIG. 3 (vertical direction in FIG. 2), with the center line X shown in FIG. 2 as a boundary. The openings 210 (FIG. 12) are formed symmetrically. Further, as shown in FIG. 12, a pair of openings 211 having a diameter slightly larger than the opening 210 are formed in a position facing the opening 210 in the vertical direction on the upper wall 206 of the horizontally long box body 201. When the cylindrical member 216 is moved up and down by the pneumatic cylinder 203, the centering cylindrical portion 212 fixed to the upper end of the cylindrical member 216 moves forward and backward through these openings 210 and 211. The inner diameter of the centering cylindrical portion 212 is formed slightly larger than the diameter of the workpiece W. A flange portion 216c is fixed to the upper end portion of the cylindrical member 216, and a flange portion 214 formed at the lower end portion of the centering cylindrical portion 212 is fixed to the flange portion 216c. The flanges 214 and 216c have the same diameter, and the diameter is set to be slightly smaller than the diameter of the opening 210. A lens support columnar portion 213 having the same diameter as the piston rod 215 is fixed to the upper end portion of the piston rod 215, and the lens support columnar portion 213 is slidably fitted in the centering cylindrical portion 212. . At the upper end of the lens support columnar portion 213, a recess 213a for mounting the work piece W or the work piece W (molded lens) after molding is formed.

The cylindrical member 216 that slidably supports the piston rod 215 inside is vertically slidable by a support block 217 that is fixed to the lower surface of the lower wall 205 of the horizontally long box body 201. Supported by. A block 216a is fixed to the lower end of the cylindrical member 216, and a pneumatic cylinder 219 is fixed to the block 216a via an L-shaped metal fitting 216b fixed to the block 216a. The pneumatic cylinder 219 is for axially moving the piston rod 215 with respect to the cylindrical member 216. The upper limit position of movement of the piston rod 215 with respect to the cylindrical member 216 is an adjustment provided at the lower end of the piston rod 215. It can be adjusted by the part 219a. In a state in which the pneumatic cylinder 219 is not operated, that is, in a state in which the piston rod 215 is located at the lowermost position with respect to the cylindrical member 216, the recess 213a is located slightly below the upper end of the centering cylindrical portion 212. . In this state, when the work piece W is placed in the recess 213a, the inner diameter of the centering cylinder portion 212 is slightly larger than the diameter of the work piece W, so that the work piece W falls into the centering cylindrical portion 212, and the work piece The piece W is centered on the lens supporting columnar portion 213 on the concave portion 213a.

As shown in FIGS. 3 and 5, the guide shaft 202 is fixed to the support block 217 in a state parallel to the cylindrical member 216. A hole 216d is formed in the block 216a. The guide shaft 202 is fitted into the hole 216d so as to allow the hole 216d to slide on the guide shaft 202. As a result, the block 216a is guided and supported by the guide shaft 202 so as to be vertically movable.

The guide shaft 202 extends to the inside of the base 11, and the lower end portion 202 a is fixed to the upper portion of the pneumatic cylinder 203 via a plate member 208. The pneumatic cylinder 203 fixed to the plate member 208 can move up and down the block 216a and the member fixed to the block 216a.

As shown in FIG. 12, a plate-shaped sealing material 218 is placed on the upper surface of the upper wall 206 of the oblong box body 201 so as to straddle the pair of openings 211. The sealing material 218 has an opening 218a formed concentrically with the opening 211 and having a diameter smaller than the opening 211 and slightly larger than the outer diameter of the upper cylindrical portion of the centering cylindrical portion 212, respectively. A pair is formed corresponding to this. When the centering cylindrical portion 212 is most raised by the pneumatic cylinder 203, the state shown by the chain double-dashed line in FIG. 12, that is, the upper portion of the centering cylindrical portion 212 projects upward from the opening 218a and the upper surface of the flange portion 214 is the sealing material 218. It comes into surface contact with the lower surface of the. In this state, the action of the seal member 218 and the flange portion 214 blocks the internal space C from the atmosphere above the seal member 218.

On the upper surface of the sealing material 218, the moving box body 220 is positioned so as to cover the pair of openings 218a. The moving box 220 has a side wall 221 and an upper wall 222, and the lower part of the space E surrounded by the side wall 221 and the upper wall 222 is open. A groove 221a is formed along the lower end of the side wall 221, and an annular packing 223 is fitted in the groove 221a.

The moving box 220 is provided with a pair of guide shafts 225 fixedly extending vertically upward from the upper wall 222. These guide shafts 225 are provided symmetrically with the center line X in FIG. 2 as a boundary, and are vertically movably supported by a guide portion 227 of a guide plate 226 fixedly provided on the support substrate 150. Has been done. Therefore, the movable box body 220 can be moved upward away from the upper wall 206 while being guided by the pair of guide shafts 225 and the guide portion 227.

On the guide plate 226, a pneumatic cylinder 233 extending upward is fixed. The pneumatic cylinder 233 has a piston rod 234 that vertically moves up and down. The lower end of the piston rod 234 is fixed to the upper wall 222 of the moving box body 220. Therefore, the movable box 220 can be moved up and down by operating the pneumatic cylinder 233.

The moving box body 220 has a coil heater 231a for preheating the workpiece W placed on the recess 213a on the loading side (FIGS. 6 and 12). The coil heater 231a is fixed to the side wall 221, and the heater portion (not shown) is located above the carry-in side recess 213a in the space E. A temperature sensor 230 is provided above the carry-in side recess 213a in the space E, and the temperature of the coil heater 231a is controlled using the temperature sensor 230. Further, the moving box 220 is provided with a pair of supply holes 231 and discharge holes 232 that communicate with the space E. With the moving box 220 positioned on the sheet material 218 (the state shown in FIG. 12), nitrogen gas is supplied into the space E from the supply hole 231 and the air inside the space E is discharged to the outside from the discharge hole 232. Then, the interior of the space E is filled with nitrogen gas. Neither a device that supplies nitrogen gas from the supply hole 231 nor a device that discharges the air inside the space E from the discharge hole 232.

Next, the lens loading / unloading section 300 will be described. As shown in FIGS. 2, 5, and 7, the lens loading / unloading section 300 includes a pair of lens loading / unloading devices 301 fixedly provided on the base 11 and having the same structure. The lower lens loading / unloading device 301 of FIG. 2 is used to load the workpiece W into the press working unit 100, and the upper lens loading / unloading device 301 of FIG. ) Is carried out from the press working section 100.

Each lens loading / unloading device 301 has an arm 302 extending in the horizontal direction. The pair of arms 302 are respectively arranged along straight lines V ₁ and V ₂ (FIG. 2) passing through the center of the lower core 13 and the center of the opening 218a, and one end of the arm 302 provided with the gripping hand 303. 302a is located inside the space C via the corresponding insertion hole 207 of the pair of insertion holes 207 provided on the side of the oblong box body 201. Therefore, it can be seen that the pair of lens loading / unloading devices 301 are symmetrically arranged in a V shape with the center line X as a boundary when viewed from above the device. An annular groove 207a is formed on the inner peripheral surface of the insertion hole 207, and an annular packing 207b fitted in the annular groove 207a is in contact with the outer peripheral surface of the arm 302. As a result, the gap between the insertion hole 207 and the arm 302 is hermetically sealed.

The arm 302 has a gripping hand 303 capable of gripping the workpiece W at one end 302 a, and the other end 302 b is fixed to the linear block 304. The linear block 304 is movable in the longitudinal direction of the arm 302 by a rodless cylinder 306 fixedly provided on the relay linear block 305. The intermediate linear block 305 is movable in the longitudinal direction of the arm 302 by a rodless cylinder 308 fixedly provided on a fixed block 307 placed on the base 11. Therefore, the arm 302 can be moved along the longitudinal direction of the arm 302 by the movement of the linear block 304 and the relay linear block 305.

By the movement of the relay linear block 305 with respect to the fixed block 307 (FIG. 2, FIG. 5), the arm 302 moves from its final retracted position, and the gripping hand 303 sets the center of the gripping part on the axis line of the lens supporting cylindrical part 213. It is moved to the matching position (holding position). On the other hand, the movement of the linear block 304 with respect to the relay linear block 305 moves the arm 302 from the gripping position to a position where the gripping portion of the gripping hand 303 is located on the lower die core 13.

In each linear block 304, a pair of upper and lower compact cylinders 310 is fixedly provided at a position facing the other end 302 a of the arm 302. These compact cylinders 310 are connected to an air compressor (not shown), the air from the air compressor passes through the inside of the arm 302, and the grip handle 303 is appropriately operated by the change in the inflow / outflow amount of the air. .

The glass mold press 10 of the present invention having the above structure operates as follows. First, the spaces A and C are filled with nitrogen gas through the communication passages 115 and 125 (first step). Next, the pneumatic cylinder 203 raises the cylindrical member 216 on the loading side, and the centering cylindrical portion 212 on the cylindrical member 216 is moved from the initial position shown by the solid line in FIG. 12 to the upper limit position shown by the chain double-dashed line ( Second step). Subsequently, the pneumatic cylinder 233 lifts the moving box 220 upward to maintain the state in which the moving box 220 is separated from the seal material 218 (third step). After that, the work piece W is placed on the recessed portion 213a by a worker's hand or an automatic supply device or the like (fourth step). At this time, the workpiece W is centered on the lens supporting columnar portion 213.

After the work piece W is placed on the recess 213a, the movable box body 220 that has been held is lowered and placed again on the seal material 218 (fifth step). In this state, the coil heater 231a is energized to heat the workpiece W on the recess 213a, at the same time nitrogen gas is supplied into the space E from the supply hole 231, and the air in the space E is discharged to the outside from the discharge hole 232. The gas is discharged to fill the space E with nitrogen gas (6th step).

After the work W is preheated, the loading-side cylindrical member 216 is lowered, the centering cylindrical portion 212 is returned to the initial position shown by the solid line in FIG. 12, and then the piston rod is moved by the pneumatic cylinder 219. 215 is raised to position the lens supporting columnar portion 213 at the position (standby position) indicated by the alternate long and short dash line in FIG. Only when the lens supporting column portion 213 is in this standby position, the gripping hand 303 can grip the workpiece W placed on the recess 213a, and the gripping workpiece W can be mounted on the recess 213a. It is possible to put.

Next, the loading-side arm 302 is moved from the initial position indicated by the solid line to the left in FIG. 1, and the gripping hand 303 grips the workpiece W at the standby position (eighth step). After this gripping, the lens supporting columnar portion 213 that has been raised is lowered and returned to the initial position shown by the solid line in FIG. 12 (9th step). When the lens support column 213 is in this initial position, the lens support column 213 does not interfere with the arm 302 even if the arm 302 moves across the centering cylinder 212.

Next, the arm 302 is moved into the space A of the casing member 101, and the workpiece W being grasped is released on the lower core 13 and positioned on the lower core 13 (step 10). . Then, the arm 302 is retracted from the space A and returned to the initial position shown by the solid line (11th step).

After that, the servo motor 161 is operated to lower the driven pressurizing member 130 by a predetermined amount, and further the pneumatic cylinder 118 is operated to move the cylindrical member 116 upward to move the upper core 12 and the lower core 13. A small chamber closed between them is formed, and at the same time, the temperature of the heaters 113 and 123 is further raised above the above-mentioned heat retention temperature, and both the upper core 12 and the lower core 13 are softened at a predetermined temperature (pressing temperature). (Twelfth step). Simultaneously with the completion of the temperature rise, the servo motor 161 is operated again to lower the driven pressure member 130 to the lower limit, and the work piece W is pressed by the upper core 12 and the lower core 13 (13th step).

After the workpiece W has been pressed, in order to cool the workpiece W, the temperatures of the heaters 113 and 123 are lowered to move the upper core 12 and the lower core 13 to a predetermined temperature (separation temperature lower than the above-mentioned pressing temperature. After cooling to a mold temperature), the pneumatic cylinder 118 is operated to move the tubular member 116 downward to open a fixed space between the upper core 12 and the lower core 13 (14th step). Further, at the same time when this cooling process is started, the pneumatic cylinder 176 is operated to press the pressure plate 141 with the lower end portion 180b of the rod 180 to apply the above-mentioned total load (G + L) to the stopper 111, that is, the lower die D. In addition, the pneumatic cylinder 176 is continuously operated until the cooling is completed (15th step).

After completion of this cooling, the servo motor 161 is operated to raise the moving shaft 164, and when the moving shaft 164 reaches a predetermined stop position, the moving shaft 164 is stopped from moving upward (16th step). . The stop position of the moving shaft 164 is set to a position where the upper core 12 is separated from the lower core 13 to such an extent that the gripping hand 303 can grip the workpiece W after molding. Due to this stop position, even after the work piece W 1 is attached to the upper core 12 after press forming, the work piece W 1 can be reliably gripped by the gripping hand 303. After that, the unloading side arm 302 is moved from the initial position shown by the solid line to the left in FIG. 1 and into the space A, and the gripped hand 303 is used to move the above-mentioned formed workpiece W on the lower core 13. Hold (17th step).

Subsequently, the carry-out side arm 302 is moved to retract the gripping hand 303 from the space A, and the workpiece W after molding held by the gripping hand 303 is positioned on the carry-out side recess 213a. Then, at the same time, the servo motor 161 is operated to raise the moving shaft 164 to a predetermined position to lift the driven pressure member 130 (18th step).

Subsequently, the gripping hand 303 is opened so that the molded workpiece W which is being gripped is placed on the concave portion 213a on the centering cylindrical portion 212 (step 19). Then, the arm 302 on the unloading side is retracted to the initial position, and the centering cylindrical portion 212 on which the workpiece W after molding is placed is raised to the upper limit position shown by the chain double-dashed line (step 20). After this ascent, the moving box 220 is lifted from the sealing material 218, and the workpiece W after molding, that is, the molded lens, is taken out from above the recess 213a by the operator's hand or by using an automatic feeder or the like (21st step). ).

In the case of pressing a plurality of workpieces W, in order to improve the efficiency of the processes of the above first to twenty-first steps, after the eleventh step, the steps from the first step to the ninth step are performed first. It is also possible to proceed simultaneously with the steps after the 12th step and move to the 10th step immediately after the completion of the 20th step.

The glass mold press 10 of the above-mentioned embodiment is provided with two lens loading / unloading devices 301 in order to improve work efficiency, but it goes without saying that the object of the present invention can be achieved even if only one lens loading / unloading device 301 is provided. .

Further, specific numerical values of the upper mold weight G and the pressure exerted by the pneumatic cylinder 176 are not limited to those in the above embodiment.

As described above, according to the glass mold press 10 to which the present invention is applied, when the workpiece W is pressed, the constant space between the upper core 12 and the lower core 13 is surrounded by the tubular member 116. That is, since the constant space is formed as a small chamber that is closed to the space A outside the space, the heat from the heaters 123 and 113 transmitted to the upper core 12 and the lower core 13 tends to stay in the constant space. . Therefore, the time required from when the temperature of the upper core 12 and the lower core 13 is started to be raised by the heaters 123 and 113 to when the workpiece W is softened is shortened.

Furthermore, since the spaces A and C are filled with nitrogen gas, the heat of the heaters 123 and 113 oxidizes the upper core 12, the lower core 13, and the members made of a metal material provided around these cores. Does not promote.

[0064]

[Effect of device]

 As described above, according to the glass mold press to which the present invention is applied, the tubular member is slid to the movable die side by the operation of the actuator in the molding state in which the movable die is brought closer to the fixed die. Since a small chamber that is closed to the outside air is formed between the fixed mold and the movable mold by fitting to the engaging part of, it is possible to shorten the time required to raise the temperature of the glass material that forms the lens. . Furthermore, by providing a gas supply means for filling the space inside the glass mold press with an inert gas, it is possible to prevent the core and the member made of a metal material provided around the core from being oxidized.

[Brief description of drawings]

FIG. 1 is a sectional view showing a glass mold press to which the present invention is applied.

FIG. 2 is a top view of the glass mold press shown in FIG.

FIG. 3 is a cross-sectional view showing a part of FIG. 1 in an enlarged manner.

FIG. 4 is a sectional view showing a part of FIG.

FIG. 5 is a cross-sectional view showing a part of FIG. 1 in an enlarged manner.

FIG. 6 is a top view showing a part of FIG. 2 in an enlarged manner.

7 is a top view showing a part of FIG. 2 in an enlarged manner. FIG.

FIG. 8 is a partial cross-sectional view of the glass mold press shown in FIG.

FIG. 9 is an enlarged sectional view showing a part of FIG.

FIG. 10 is a sectional view showing an essential part of a glass mold press to which the present invention is applied.

FIG. 11 is a cross-sectional view showing a main part in a state different from that of the main part in FIG.

FIG. 12 is a cross-sectional view showing a part of FIG. 1 in an enlarged manner.

[Explanation of symbols]

 10 Glass Mold Press 11 Base 12 Upper Core 13 Lower Core 100 Pressing Part 110 Lower Core Support Member (Fixed Type Support Member) 111 121 Stopper 112 122 Thermal Conductive Core 113 123 Heater 114 124 Temperature Sensor 116 Cylindrical Member 118 Pneumatic Cylinder 120 Upper core support member (movable support member) 130 Driven pressure member 135 Sliding member 140 Engagement block part 158 Rotating member 160 Large gear 161 Servo motor 162 Small gear 163 Female screw 164 Moving shaft 165 Male screw 166 167 Restricting shaft 168 169 Guide groove 172 Upper limit detection sensor 173 Origin detection sensor 174 Lower limit detection sensor 176 Pneumatic cylinder 177 Piston rod 180 Rod 182 Ring member 200 Lens elevating part 209 Elevating mechanism 210 211 211 Opening 212 Centering Cylindrical Section 213 Lens Supporting Cylindrical Section 213a Recess 214 Flange 215 Piston Rod 216 Cylindrical Member 218 Sealing Material 219 Pneumatic Cylinder 220 Moving Box 231a Coil Heater 233 Pneumatic Cylinder 300 Lens Carrying In / Out Section 301 Lens Carrying In / Out Device 302 Arm 303 Grasping Hand 304 Linear block 305 Relay linear block 306 308 307 Fixed block 310 Compact cylinder U Upper mold D Lower mold

Claims (3)

[Scope of utility model registration request] 1. A glass mold press in which one of an upper mold and a lower mold for a glass mold is a fixed mold and the other is a movable mold that is brought into contact with and separated from the fixed mold, and can slide on the outer periphery of a fixed mold support member. A tubular member provided in
An engaging portion provided on the outer periphery of the movable die support member, into which the tubular member can be fitted; and an actuator that slides the tubular member; In the molding state in which they are brought close to each other, the small chamber closed to the outside air is formed between the fixed mold and the movable mold by being slid to the movable mold side by the operation of the actuator and fitted into the engaging portion. A glass mold press characterized by being. 2. The glass mold press according to claim 1, further comprising gas supply means for filling an inert gas in a space inside the glass mold press. 3. The glass mold press according to claim 1, wherein the actuator is a fluid pressure cylinder, and the tubular member slides by the operation of the fluid pressure cylinder.