TWI385067B - Mold and method for using same - Google Patents

Description

Mold and its use method

The invention relates to a mold and a using method thereof, in particular to a precision mold capable of eliminating the deviation existing in the forming process of the optical lens and a using method thereof.

The injection molding technology installs the injection mold on the molding machine, controls the pressure and temperature in the injection mold, and injects the melted plastic into the injection mold, and finally cools and solidifies to form the plastic product. Injection molding technology features fast forming speed, one-shot molding, and long tool life. For the manufacturing method of the mold, please refer to the paper "Knowledge-based Mold Design For Injection Molding Processing" published by Tseng et al. in the IEEE International Symposium on Intelligent Control (1990).

When manufacturing an optical lens by using a conventional injection mold, since the precision of the mold processing and the precision of the mold clamping of the molding machine are limited, when the male mold of the mold is closed with the mother mold, the deviation between the two is prone to occur, thereby making the manufactured optical lens The two aspherical surfaces on both sides inevitably have a certain degree of eccentricity, that is, the geometric centerlines of the two aspheric surfaces on both sides of the optical lens do not coincide, and there is a certain deviation, resulting in the optical axis of the formed optical lens and its geometric center line. Do not coincide.

A prior art injection mold 10 as shown in FIG. 1 includes a male mold 100, a female mold 110, a male mold core 120, and a female mold core 130. The male mold core 120 is provided with a first molding surface 122, and the female mold core 130 is provided with a first Two molding faces 132. When the mold 10 is clamped, a molding space (not shown) is formed for molding the optical lens 12. The first molding surface 122 of the male mold core 120 and the second molding surface 132 of the female mold core 130 are respectively used for Two aspherical surfaces on both sides of the optical lens 12 are formed.

The mold 10 shown in FIG. 1 is in a mold clamping state, and the geometric center line of the first molding surface 122 of the male mold core 120 and the geometric center line of the second molding surface 132 of the female mold core 130 have a deviation, that is, A deviation amount φ, therefore, causes a deviation amount φ between the geometric centerlines of the two aspheric surfaces on both sides of the formed optical lens, so that the optical lens manufactured by the mold 10 is a defective lens.

In the prior art, when there is a deviation between the male mold core 120 and the female mold core 130, the male mold core 120 or the female mold core 130 is generally replaced to correct the between the male mold core 120 and the female mold core 130. deviation. However, the above method is costly.

In view of the above, it is necessary to provide a precision mold which can eliminate the deviation existing in the molding process of an optical lens and which is low in cost and a method of using the same.

A mold comprising: a female mold; a male mold, the male mold is provided with a mounting hole; a female mold core assembled to the female mold, the female mold core is provided with a first molding surface; and a male mold is assembled to the male mold a male mold core of the mounting hole, the male mold core is provided with a second molding surface corresponding to the first molding surface of the female mold core; wherein the male mold is provided with at least one through hole penetrating the mounting hole, the male a gap between the outer wall of the mold core and the inner wall of the mounting hole, the outer wall of the male mold being provided with at least one threaded hole corresponding to the through hole of the male mold, the mold comprising at least one gasket and at least one bolt, The gasket is placed in the male mold Between the outer wall and the inner wall of the mounting hole of the male mold, the spacer is provided with a through hole corresponding to the through hole of the male mold and the threaded hole of the male mold, and the bolt is inserted through the male mold The hole and the through hole of the gasket are connected to the male mold by the threaded hole of the male mold.

A method for using the above mold, the mold is used for molding an optical lens, the optical lens has a first curved surface and a second curved surface, and the first molding surface of the female mold core is used for molding a first curved surface of the optical lens, the male mold The second molding surface of the kernel is used for molding the second curved surface of the optical lens, and the method of using the method comprises the steps of: measuring a geometric center line of the second molding surface of the male mold core and a geometric center line of the first molding surface of the female mold core Whether there is a deviation; when there is a deviation between the geometric center line of the second molding surface of the male mold and the geometric center line of the first molding surface of the female mold, the second gasket is replaced with a third gasket, The thickness of the third spacer is different from the thickness of the second spacer, and the third spacer is placed between the outer wall of the male mold and the inner wall of the mounting hole of the male mold to Translating relative to the female mold, the geometric center line of the second molding surface of the male mold is coincident with the geometric center line of the first molding surface of the female mold.

Compared with the prior art, the mold includes at least one gasket and at least one bolt, and the male mold core can be translated relative to the female mold core by replacing the gasket with different thickness, so that the second molding surface of the male mold core The geometric centerline coincides with the geometric centerline of the first molding surface of the female mold, thereby correcting the deviation between the geometric centerline of the second molding surface of the male mold and the geometric centerline of the first molding surface of the female mold, There is no need to replace the male mold or the female mold core, thereby reducing the production cost.

The invention will now be further described in detail in conjunction with the drawings.

Please refer to FIG. 2 to FIG. 4 , which is a mold 20 for molding an optical lens 40 (shown in FIG. 5 ) having a first curved surface 42 and a second curved surface 44 . The mold 20 includes a female mold 210, a female mold 220 assembled to the female mold 210, a male mold 230, a male mold 240 assembled to the male mold 230, and a first one disposed on the male mold 230. The spacer 252, the first bolt 254, the second spacer 262, and the second bolt 264.

The female mold core 220 is provided with a first molding surface 222 (shown in FIG. 7) for molding the first curved surface 42 of the optical lens 40.

The male mold 230 is provided with a mounting hole 232, a first through hole 234 and a second through hole 236. The inner wall of the mounting hole 232 extends along the mutually perpendicular radial direction of the mounting hole 232 to form two recesses 238, 239. The first through hole 234 extends from the outer wall of the male die 230 to the sidewall 2382 of the recess 238. The second through hole 236 extends from the outer wall of the male die 230 to the sidewall 2392 of the recess 239. The central axis of the bore 234 is perpendicular to the central axis of the second through bore 236.

The male mold 240 is assembled to the mounting hole 232 of the male mold 230. The male mold 240 includes an inlet 242 and a set of inlet sleeves 244 disposed in the inlet 242. One end of the insert 242 is provided with a second forming surface 2422 opposite to the first forming surface 222 of the female mold core 220. The second forming surface 2422 is used to form the second curved surface 44 of the optical lens 40. There is a gap between the outer wall of the inlet sleeve 244 and the inner wall of the mounting hole 232 of the male mold 230, the gap being less than 0.01 mm. The inlet sleeve 244 has a cylindrical structure, and the inlet sleeve The 244 is provided with two contact faces 2442, 2444 parallel to its axial direction, and the contact faces 2442, 2444 are all planar. The contact surface 2442 of the inlet sleeve 244 is provided with a first threaded hole 2446 opposite to the first through hole 234 of the male mold 230. The contact surface 2444 of the inlet sleeve 244 is provided with a second threaded hole 2448 opposite to the second through hole 236 of the male mold 230.

The first spacer 252 is received in the recess 238 of the male mold 230. The two opposite sides 2522 and 2524 of the first spacer 252 respectively abut the contact surface 2442 of the inlet sleeve 244 and the male mold. Side wall 2382 of recess 238 of 230. The first gasket 252 is provided with a first through hole 234 of the male mold 230 and a third through hole 2526 corresponding to the first threaded hole 2446 of the inlet sleeve 244. The first bolt 254 is disposed in the first through hole 234 of the male die 230 and the third through hole 2526 of the first gasket 252 , and is screwed to the first threaded hole 2446 of the inlet sleeve 244 . In this embodiment, the first through hole 234 of the male die 230 and the third through hole 2526 of the first spacer 252 are both circular holes, and the first through hole 234 of the male die 230 and the first spacer The diameter of the third through hole 2526 of the second hole 252 is greater than the outer diameter of the first bolt 254, so that the first bolt 254 can be opposite to the first through hole 234 of the male die 230 and the third pass of the first gasket 252. The hole 2526 moves.

The second spacer 262 is received in the recess 239 of the male mold 230. The two opposite sides 2622 and 2624 of the second spacer 262 respectively abut the contact surface 2444 of the inlet sleeve 244 and the male mold. Side wall 2392 of groove 239 of 230. The second spacer 262 is provided with a fourth through hole 2626 corresponding to the second through hole 236 of the male die 230 and the second threaded hole 2448 of the inlet sleeve 244. The second bolt 264 is disposed in the second through hole of the male mold 230 236 and the fourth through hole 2626 of the second spacer 262 are screwed to the second threaded hole 2448 of the inlet sleeve 244. In this embodiment, the second through hole 236 of the male die 230 and the fourth through hole 2626 of the second spacer 262 are both circular holes, and the second through hole 236 of the male die 230 and the second spacer The diameter of the fourth through hole 2626 of the 262 is greater than the outer diameter of the second bolt 264, so that the second bolt 264 can be connected to the second through hole 236 of the male die 230 and the fourth pass of the second spacer 262. Hole 2626 moves.

The first bolt 254 abuts the contact surface 2442 of the inlet sleeve 244 against the first gasket 252 and causes the first gasket 252 to abut against the sidewall 2382 of the groove 238 of the male mold 230. The second bolt 264 abuts the contact surface 2444 of the inlet sleeve 244 against the second spacer 262 and causes the second spacer 262 to abut against the sidewall 2392 of the recess 239 of the male mold 230 to determine The position of the insert sleeve 244 and the insert 242 in the mounting hole 232 of the male mold 230 is such that the geometric center line of the second molding surface 2422 of the insert 242 and the first molding surface of the female mold core 220 The geometric centerlines of 222 coincide.

The mold 20 is used as follows: First, it is measured whether there is a deviation between the geometric center line of the second molding surface of the male mold and the geometric center line of the first molding surface of the female mold.

The amount of deviation between the geometric centerline of the second molding surface 2422 of the male mold 242 of the male mold 240 and the geometric centerline of the first molding surface 222 of the female mold core 220 can be measured by the following two methods:

a) directly measuring the geometric centerline of the second forming surface 2422 of the insert 242 and the first forming surface 222 of the female mold 220 by using a three-coordinate measuring instrument The amount of deviation between the centerlines.

b) measuring the deviation between the geometric center line of the second curved surface 44 of the optical lens 40 formed by the mold 20 and the geometric center line of the first curved surface 42 by using a three-coordinate measuring instrument to calculate the number of the input 242 The amount of deviation between the geometric centerline of the second forming surface 2422 and the geometric centerline of the first forming surface 222 of the female mold core 220.

Secondly, when there is a deviation between the geometric center line of the second molding surface of the male mold and the geometric center line of the first molding surface of the female mold, the second gasket is replaced with a third gasket, and the third The thickness of the spacer is different from the thickness of the second spacer, and the third spacer is placed between the outer wall of the male mold and the inner wall of the mounting hole of the male mold to The female mold is translated such that the geometric center line of the second molding surface of the male mold body coincides with the geometric center line of the first molding surface of the female mold core.

Referring to FIG. 6, after the mold 20 is clamped, the geometric center line of the second molding surface 2422 of the insert 242 of the male mold 240 is between the geometric center line of the first molding surface 222 of the female mold core 220. The amount of deviation in the X-axis direction is δ. Therefore, the input 242 needs to be translated by δ displacement in the negative direction of the X-axis to correct the geometric center line of the second molding surface 2422 of the input 242 and the female mold core 220. The amount of deviation δ between the geometric centerlines of the first forming faces 222. The second spacer 262 is replaced with the third spacer 266 according to the deviation amount δ, and the second sleeve 244 is caused to abut the third spacer 266 by the second bolt 264, and the first The three spacers 266 abut against the male mold 230 to translate the input 242 relative to the female mold core 220 in the negative direction of the X-axis by a delta displacement such that the geometric centerline of the second molding surface 2422 of the inlet 242 is The geometric centerlines of the first forming faces 222 of the female mold cores 220 coincide (as shown in Figure 7). The third pad 266 of thickness d ₁ is equal to the thickness of the second spacer 252 and the sum d ₂ of the deviation δ.

It can be understood that when there is a deviation between the geometric center line of the second molding surface 2422 of the insert 242 and the geometric center line of the first molding surface 222 of the female mold core 220, according to the deviation amount, The first spacer 252 is replaced with another spacer having a different thickness to translate the inlet 242 relative to the female mold core 220 in the Y-axis direction such that the geometric center of the second molding surface 2422 of the inlet 242 The line coincides with the geometric centerline of the first forming surface 222 of the female mold core 220 to correct the geometric centerline of the second forming surface 2422 of the insert 242 and the geometric center of the first forming surface 222 of the female mold core 220. The amount of deviation between lines.

It can be understood that the deviation between the geometric center line of the second molding surface of the male mold of the mold and the geometric center line of the first molding surface of the female mold is generally a combination of the deviation in the X-axis direction and the deviation in the Y-axis direction. In this case, the mold 20 can also correct the deviation between the geometric center line of the second molding surface of the male mold and the geometric center line of the first molding surface of the female mold.

The mold 20 includes a first spacer 252 and a first bolt 254, and a second spacer 262 and a second bolt 264, by replacing the first spacer 252 or the second spacer 262 with Another spacer having a different thickness may cause the 242 of the male mold 240 to translate relative to the female mold 220 such that the geometric centerline of the second molding surface 2422 of the inlet 242 and the female mold core 220 The geometric centerlines of the first forming faces 222 coincide to correct the deviation between the geometric centerline of the second forming face 2422 of the insert 242 and the geometric centerline of the first forming face 222 of the female die 220 without The male mold 240 or the female mold core 220 is replaced, thereby reducing production costs.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10,20‧‧‧Mold

12,40‧‧‧Optical lenses

100,230‧‧‧Male model

110,210‧‧‧Female model

120,240‧‧‧Male model

122, 222‧‧‧ first molding surface

130,220‧‧‧Female mold

132,2422‧‧‧Second molding surface

232‧‧‧Mounting holes

234‧‧‧First through hole

236‧‧‧Second through hole

238, 239 ‧ ‧ grooves

2382, 2392‧‧‧ side wall

242‧‧‧ into the child

244‧‧‧ into the sleeve

2442, 2444‧‧ ‧ contact surface

2446‧‧‧First threaded hole

2448‧‧‧Second threaded hole

252‧‧‧First gasket

2522, 2524, 2622, 2624‧‧‧ side

2526‧‧‧3rd through hole

254‧‧‧First bolt

262‧‧‧second gasket

2626‧‧‧4th through hole

264‧‧‧second bolt

266‧‧‧ third gasket

42‧‧‧First surface

44‧‧‧Second surface

FIG. 1 is a schematic view showing the eccentricity of an optical lens caused by mold clamping eccentricity in the prior art.

2 is a perspective view of a mold provided by an embodiment of the present invention.

Figure 3 is an exploded view of the mold shown in Figure 2.

Figure 4 is a partial cross-sectional view of the mold shown in Figure 2.

Figure 5 is a cross-sectional view of the optical lens formed by the mold shown in Figure 2.

Fig. 6 is a schematic view showing the eccentricity of the mold clamping shown in Fig. 2.

Figure 7 is a cross-sectional view of the mold shown in Figure 6 after the eccentricity error is corrected.

20‧‧‧Mold

210‧‧‧Female model

220‧‧‧Female model

230‧‧‧Male model

240‧‧‧Male model

242‧‧‧ into the child

244‧‧‧ into the sleeve

252‧‧‧First gasket

254‧‧‧First bolt

262‧‧‧second gasket

264‧‧‧second bolt

Claims (9)

A mold comprising: a female mold; a male mold, the male mold is provided with a mounting hole; a female mold core assembled to the female mold, the female mold core is provided with a first molding surface; and a male mold is assembled to the male mold a male mold core of the mounting hole, the male mold core is provided with a second molding surface corresponding to the first molding surface of the female mold core; and the improvement is that the male mold is provided with at least one through hole penetrating the mounting hole, The male mold core has a cylindrical structure, and the male mold core is provided with at least one contact surface parallel to the axial direction thereof, the contact surface is a plane, and a gap is formed between the outer wall of the male mold core and the inner wall of the mounting hole. The outer wall of the male mold is provided with at least one threaded hole corresponding to the through hole of the male mold, the mold comprises at least one gasket and at least one bolt, and the gasket is placed on the outer wall of the male mold and the male mold Between the inner walls of the holes, the contact surface is in contact with the surface of the gasket, and the spacer is provided with a through hole corresponding to the through hole of the male mold and the threaded hole of the male mold, the bolt is disposed through the hole a through hole of the male mold and a through hole of the spacer, and connected to the male mold by the threaded hole of the male mold . The mold of claim 1, wherein the inner wall of the mounting hole of the male mold extends in a radial direction of the mounting hole to extend at least one groove for receiving the gasket. The mold of claim 1, wherein a gap between the outer wall of the male mold core and the inner wall of the mounting hole is less than 0.01 mm. The mold of claim 1, wherein the through hole of the male mold and the through hole of the gasket are round holes, and the diameter of the through hole of the male mold and the diameter of the through hole of the gasket Both are larger than the outer diameter of the bolt. The mold of claim 1, wherein the male mold comprises an insert and a set of insert sleeves disposed in the insert, the second molding surface is disposed At one end of the inlet, the threaded hole is disposed on the outer wall of the inlet sleeve, and the bolt is connected to the inlet sleeve by the threaded hole. The mold of claim 1, wherein the at least one through hole of the male mold comprises a first through hole and a second through hole, wherein a central axis of the first through hole is perpendicular to the second through hole a central axis, the at least one threaded hole of the male mold includes a first threaded hole and a second threaded hole, the first threaded hole is opposite to the first through hole, and the second threaded hole is opposite to the second through hole The at least one gasket comprises a first gasket and a second gasket disposed between the outer wall of the male mold core and the inner wall of the mounting hole of the male mold, the first gasket And a third through hole corresponding to the first through hole of the male mold and the first threaded hole of the male mold, the second gasket is disposed on the outer wall of the male mold and the inner wall of the mounting hole of the male mold The second spacer is provided with a fourth through hole corresponding to the second through hole of the male mold and the second threaded hole of the male mold, the at least one bolt includes a first bolt and a second bolt The first bolt is disposed through the first through hole of the male mold and the third through hole of the first spacer, and is a threaded hole is connected to the male mold, the second bolt is disposed in the second through hole of the male mold and the fourth through hole of the second gasket, and the second threaded hole of the male mold is used The male model is connected. A method of using a mold according to claim 1, wherein the mold is used for molding an optical lens, the optical lens has a first curved surface and a second curved surface, and the first molding surface of the female mold is used to mold the optical a first curved surface of the lens, the second molding surface of the male mold is used to form a second curved surface of the optical lens, and the method includes the following steps: measuring a geometric center line of the second molding surface of the male mold and the female mold Whether there is a deviation between the geometric centerlines of the first forming surface; when the geometric center line of the second forming surface of the male mold is the first of the female mold When there is a deviation between the geometric center lines of the molding surface, the second gasket is replaced with a third gasket, the thickness of the third gasket is different from the thickness of the second gasket, and the third gasket is disposed Between the outer wall of the male mold core and the inner wall of the mounting hole of the male mold, the male mold core is translated relative to the female mold core such that the geometric center line of the second molding surface of the male mold core and the female mold The geometric centerline of the first forming surface of Ren is coincident. The method of using the method of claim 7, wherein the step of measuring whether there is a deviation between a geometric center line of the second molding surface of the male mold core and a geometric center line of the first molding surface of the female mold core is It is achieved by measuring whether there is a deviation between the geometric center line of the second curved surface of the optical lens formed by the mold and the geometric center line of the first curved surface. The method of using the method of claim 7, wherein the step of measuring whether there is a deviation between a geometric center line of the second molding surface of the male mold core and a geometric center line of the first molding surface of the female mold core is This is achieved by measuring whether there is a deviation between the geometric center line of the second molding surface of the male mold and the geometric center line of the first molding surface of the female mold by applying a three-coordinate measuring instrument.