CN100497221C - Mould core capable of precisely controlling core thickness and mould set with the mould core - Google Patents

Abstract

The invention discloses a mold core capable of precisely controlling core thickness and a mold set with the mold core, wherein the mold core is in a step shape and comprises a large-diameter section, a small-diameter section and a reference surface arranged at the joint of the large-diameter section and the small-diameter section, a first axial distance which is numerically controlled to be a known value is arranged between the reference surface and a central point of a molding surface, and a second axial distance which can be measured is arranged between the reference surface and a bottom surface. The mold set comprises a first mold unit and a second mold unit, wherein the first mold unit and the second mold unit are respectively provided with a mold base, a mold core and an adjusting block. When the first mold unit and the second mold unit are aligned, a core thickness capable of being accurately controlled is formed between the center points of the molding surfaces of the mold cores.

Description

A mold core that can precisely control the core thickness and a mold group with this mold core

technical field

The invention relates to a lens molding equipment, in particular to a mold core capable of precisely controlling core thickness and a mold set with the mold core.

Background technique

As shown in Fig. 1, existing lenses formed by molding are made by a mold set, which includes a first mold unit 1 and a second mold unit opposite to the first mold unit 1. 2. The first mold unit and the second mold unit 1, 2 each have a template 101, 201, a template 102, 202 stacked on one side of the template 101, 201, a template installed inside the template 102, 202 The mold core 103,203 and an adjustment block 104,204 installed on one side of the mold core 103,203. The pattern plate 102, 202 has a seat hole 105, 205 for the installation and positioning of the mold core 103, 203, and the mold core 103, 203 has a bearing surface 106, 206 and a recessed surface on the bearing surface. The shaping surface 107,207 on 106,206. The pattern boards 102, 202 are oppositely provided with a mold clamping surface 108, 208.

When the first mold unit and the second mold unit 1, 2 are close to each other, a core thickness can be formed between a central point of the molding surfaces 107, 207 of the mold cores 103, 203 corresponding to an axis.

Because today's optical design is trending toward miniaturization, high performance, and high resolution, the design of optical instruments is becoming more and more difficult, and the core thickness of the lens is also related to the accuracy of optical instruments.

The method generally used to control the core thickness of the lens is to use a probe-type measuring instrument or an optical measuring instrument to measure the distance between the supporting surface 106, 206 and a center point corresponding to the axis of the shaping surface 107, 207. distance, and measure the distance between the abutment surface 106, 206 and the die surface 108, 208 to calculate the core thickness. However, when measuring with a probe-type measuring instrument, the probe directly contacts the shaping surface 107, 207, which is easy to scratch the shaping surface 107, 207. When measuring with an optical measuring instrument (when not in contact), the The measurement is inaccurate due to the visual error of the measurer.

There are also people who use the mold set for actual injection trial production, and measure the core thickness according to the manufactured lens, and then correct the thickness of the adjustment blocks 104, 204 to control the core thickness of the finished lens. However, after repeated trials and corrections, the method of this test method is quite complicated and not easy.

Contents of the invention

The purpose of the present invention is to provide a mold core with simple structure, easy manufacture, accurate measurement and production of high-precision lenses, and precise control of core thickness.

Another object of the present invention is to provide a mold set with a mold core that can precisely control the core thickness, which is easy to manufacture and assemble and can produce high-precision lenses.

The present invention can precisely control the core thickness of the mold core and the mold group with the mold core. The mold core is in the shape of steps and includes a large diameter section, a small diameter section arranged on one side of the large diameter section along an axis, and a A bottom surface corresponding to the large-diameter section and perpendicular to the axis, a shaping surface opposite to the bottom surface and corresponding to the small-diameter section, a reference plane between the large-diameter section and the small-diameter section and perpendicular to the axis, the There is a first axial distance between the reference plane and a center point of the corresponding axis of the shaping surface, which is known by numerical control, and there is a measurable second axis between the reference plane and the bottom surface to the distance. The mold set includes a first mold unit and a second mold unit opposite to the first mold unit, each of the first mold unit and the second mold unit has a mold base, a mold seat installed along an axis The mold core inside the seat and an adjustment block installed on one side of the mold core, the mold base has a template and a template that are stacked and locked along the axial direction, and the template has an inner end surface opposite to the template , a clamping surface opposite to the inner end surface, a seat hole arranged axially and penetrating from the mold clamping surface to the inner end surface, the seat hole is in the shape of a narrow outside and wide inside, and has a pair of The large-diameter end of the inner end surface, the small-diameter end of the corresponding mold surface, a shoulder between the large and small-diameter ends, and a first axially extending from the mold surface to the inner end surface. depth and a second depth extending axially from the shoulder to the inner end face, the mold core is installed in the seat hole, and has a large diameter section corresponding to the large diameter end, a set along the axis a small-diameter section on one side of the large-diameter section and corresponding to the small-diameter end, a bottom surface corresponding to the large-diameter section and perpendicular to the axis, a shaping surface opposite to the bottom surface and corresponding to the small-diameter section, A datum plane perpendicular to the axis between the junction of the large and small diameter sections, there is a first axial distance between the datum plane and a center point of the shaping surface corresponding to the axis, which is numerically controlled as a known value , there is a measurable second axial distance between the reference surface and the bottom surface, the adjustment block is installed between the template and the mold core, and has a measurable third axial distance, The sum of the second axial distance and the third axial distance is not greater than the second depth of the seat hole. In this way, when the clamping surfaces of the first mold unit and the second mold unit are closed, a core thickness formed between the center points of the molding surfaces of the mold cores is equal to the sum of the first depths of the corresponding seat holes minus the relative setting The first axial distance, the second axial distance and the third axial distance of the adjustment block.

The invention can precisely control the core thickness of the mold core and the mold set with the mold core, not only simple in structure, easy to manufacture and assemble, but also can mold high-precision lenses, and can indeed achieve the purpose of the invention.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

Fig. 1 is the combined cross-sectional schematic diagram of a kind of molding lens mold group of existing;

Fig. 2 is a plane sectional view of a preferred embodiment of the mold core that can precisely control the core thickness of the present invention;

Fig. 3 is a processing schematic diagram of the above-mentioned preferred embodiment of the present invention, illustrating that the mold core is clamped on the chuck of a numerical control processing machine;

Fig. 4 is the combined sectional view of a preferred embodiment of the die set with the die core that can precisely control the core thickness of the present invention; and

Fig. 5 is a partial enlarged view of the mold set of the above-mentioned preferred embodiment of the present invention.

Detailed ways

For convenience of description, in the following embodiments, the same components are denoted by the same reference numerals.

As shown in Figure 2, the preferred embodiment of the mold core 10 that can precisely control the core thickness of the present invention is a columnar shape and includes a large diameter section 11, a small diameter section arranged on one side of the large diameter section 11 along an axis L 12. A pair of the bottom surface 13 of the large-diameter section 11 and perpendicular to the axis L, a bearing surface 14 opposite to the bottom surface 13 and corresponding to the small-diameter section 12, and an inward recess from the bearing surface 14 The shaping surface 15, a datum plane 16 between the junction of the large and small diameter sections 11, 12 and perpendicular to the axis L. The large-diameter section 11 is stepped, and has a first section 111 provided with the bottom surface 13 and a second section 112 located between the first section 111 and the small-diameter section 12. The second section 112 has a calibration annulus 113 formed around the axis L and having a diameter larger than the small diameter section 12 but smaller than the first section 11. The calibration annulus 113 can be used to calibrate the roundness of the center of the mold core 10 and precision, and the reference plane 16 is located between the small-diameter section 12 and the second section 112 . The section of the small-diameter section 12 can be circular or non-circular (such as D-shaped). There is a first axial distance D ₁ between the reference plane 16 and a center point C of the shaping surface 15 corresponding to the axis L, which is a known value based on numerical control, and there is a distance between the reference plane 16 and the bottom surface 13 A measurable second axial distance D ₂ . The second axial distance D ₂ can be obtained by placing the bottom surface 13 of the mold core 10 on a granite plate (not shown in the figure), and measuring the reference surface 16 by a common contact method.

As shown in Figure 3, when the first section 111 of the mold core 10 is clamped on the chuck 110 of a numerically controlled processing machine 100, and is processed with a tool (not shown), it is from a starting point O toward When the mold core 10 enters the tool and starts cutting, and the shaping surface 15 is completed to form the center point C, the cutting distance of the tool (the distance from the starting point O to the center point C) is 1, and when the tool enters the tool from the starting point O Cutting, and the cutting distance is l plus the first axial distance D ₁ preset as a known value, the reference plane 16 can be obtained.

And the function of the calibration ring surface 113 is to use it as a detection reference for correct centering of the axis L when the mold core 10 is clamped on the chuck 110, so as to modify the shaping surface 15 and reference surface 16 in the future. , the center point C can be found correctly.

As shown in FIGS. 4 and 5 , the mold set 200 of the present invention includes a first mold unit 210 and a second mold unit 220 corresponding to the first mold unit 210 along the axis L direction.

The first mold unit 210 and the second mold unit 220 each have a mold base 20, 20', a mold core 10, 10' mounted inside the mold base 20 along the axis L, and a mold core mounted on the mold core. The adjustment blocks 30, 30' on one side of 10, 10'. Although only a pair of mold cores 10, 10' are shown in the combined sectional view of Fig. 4, it is understandable that the mold set 200 of the present invention can be multi-mode injection.

The mold bases 20, 20' each have a template 21, 21' and a template 22, 22' stacked and locked along the axial direction, and the template 22, 22' also has a template 21, 21' respectively. Opposite inner end surfaces 221, 221', one mold-mold surface 222, 222' opposite to the inner end surface 221, 221', one axially disposed and penetrating from the mold-mold surface 222, 222' to the inner end surface 221 , 221' seat holes 223, 223'. The seat holes 223, 223' are in the shape of steps with narrow outside and wide inside, which can be used for the installation of the mold core 10, 10', and have a pair of large-diameter ends 224, 224' of the inner end faces 221, 221', A pair of small-diameter ends 225, 225' corresponding to the mating surfaces 222, 222', a shoulder 226, 226' between the large-diameter ends 224, 224' and small-diameter ends 225, 225', a The mating surface 222, 222' extends axially to a first depth H ₁ , H _{1' of the inner end surface 221, 221' and a first depth H 1 , H 1} ' extends axially from the shoulder 226, 226' to the inner end surface 221, 221' The second depth H ₂ , H ₂ '. The large-diameter end portions 224, 224' are also made into steps to match the first section 111, 111' and the second section 112, 112' of the mold core 10, 10', and have a corresponding first section The first concave ring 227, 227' of the part 111, 111' and a second concave ring 228, 228' arranged between the first concave ring 227, 227' and the small diameter end 225, 225', the first The diameter of the two concave rings 228, 228' is larger than the small diameter end 225, 225' but smaller than the first concave ring 227, 227', and the shoulder 226, 226' is between the small diameter end 225, 225' and the first concave ring 225, 225'. The junction of the two concave rings 228, 228'.

The mold cores 10, 10' are respectively installed in the seat holes 223, 223', and their structure is shown in Figure 5, each having a first axial distance D ₁ , D ₁ ' and a second axial distance D ₂ , D ₂ '.

The adjustment block 30, 30' is installed between the template 21, 21' and the mold core 10, 10', and has a third axial distance D ₃ that can be accurately measured, and its measurement method can be compared with The second axial distance D ₂ is the same, and the sum of the second axial distance D ₂ and the third axial distance D ₃ is less than or equal to the second depth H ₂ , H ₂ ′ of the seat holes 223, 223 ′. In this embodiment For example, a gap is formed between the shoulder 226, 226' and the reference surface 16, 16'. The die cores 10, 10' are fixed in such a way that bolts (not shown) fixed to the templates 21, 21' pass through the adjustment blocks 30, 30' and then locked.

As shown in Fig. 4 and Fig. 5, when the first mold unit 210 and the second mold unit 220 are close to each other and their matching surfaces 222, 222' are aligned, the corresponding mold cores 10, 10' A core thickness T formed between the center points C and C' of the shaping surface 15, 15', the core thickness T is equal to the sum of the first depth H ₁ , H ₁ ', deducting the mold core 10, 10 set oppositely 'The first axial distance D ₁ , D ₁ ′, the second axial distance D ₂ , D _{2 ′} , and the third axial distance D ₃ , D _{3 ′} of the adjustment block 30 .

And because the first axial distances D _{1 ,} D ₁ ′ are accurately controlled numerically during processing of the mold cores 10, 10 ′, and the second axial distances D ₂ , D ₂ ′ can be accurately measured Therefore, the core thickness T can be accurately obtained by correcting the third axial distance D ₃ , D ₃ ′, without measuring the molding surface 15 , 15 ′ or repeating the injection trial.

The molding surfaces 15, 15' of the mold cores 10, 10' in the above-mentioned embodiments are recessed inwardly from the bearing surfaces 14, 14', but the molding surfaces 15, 15' can also be formed from the bearing surfaces 14, 14' protrudes outward.

Therefore, the present invention utilizes the mold set 200 and the mold cores 10, 10' installed in the mold set 200 to achieve the purpose of precisely controlling the lens core thickness.

Claims (7)

1. can accurately control the thick die of core for one kind, it is characterized in that:

This die is to be step shape, and comprise a big footpath section, one along an axis be located at the path section of this big footpath section one side, a pair of section of footpath greatly and perpendicular to the bottom surface of this axis, one and the opposing setting in this bottom surface and corresponding to the moulding surface of this path section, between this large and small footpath section joining place and perpendicular to the reference plane of this axis, this reference plane and this moulding surface are first axial distance of given value to having one between should a central point of axis with the Numerical Control, have second axial distance that can be measured between this reference plane and this bottom surface.

2. as claimed in claim 1 can the thick die of accurate control core, it is characterized in that: this big footpath section is to be step shape, and have first a section portion and second a section portion that is located between this first section portion and this path section that is provided with this bottom surface, this second section portion has one and forms and the footpath is wider than the path section still less than the calibration anchor ring of first section portion around this axis, and this reference plane is between this path section and this second section portion's joining place.

3. as claimed in claim 2 can the thick die of accurate control core, it is characterized in that: also including one, to be centered around this moulding surface outside and perpendicular to the breasting face of this axis, this moulding surface is towards being recessed by this breasting.

4. as claimed in claim 2 can the thick die of accurate control core, it is characterized in that: also including one, to be centered around this moulding surface outside and perpendicular to the breasting face of this axis, this moulding surface is towards outer protrusion by this breasting.

5. set of molds with can accurate control core thick die comprises second die unit that one first die unit and is oppositely arranged with this first die unit vertically, it is characterized in that:

This first die unit, has a die holder, one die and that is installed in this die holder inside along an axis is installed in the adjustment piece of this die one side, this die holder has along should axially foldedly establishing a template and a template of locking, this template has an inner face relative with template, one with the opposing land area of this inner face, one is provided with and is through to by this land area the seat hole of this inner face vertically, it is outer narrow that this hole is, the step shape of inner width, and has an a pair of bigger diameter end portion that should inner face, a pair of path end that should land area, one is big between this, shoulder between the path end, one first degree of depth and that extends to inner face vertically by this land area extends to second degree of depth of inner face vertically by this shoulder, this die is to be installed in this hole, and has an a pair of big footpath section that should bigger diameter end portion, one is located at this big footpath section one side and corresponding to the path section of this path end along this axis, a pair of should be greatly footpath section and perpendicular to the bottom surface of this axis, one with the opposing setting in this bottom surface and corresponding to the moulding surface of this path section, one is big between this, path section joining place and perpendicular to the reference plane of this axis, this reference plane and this moulding surface are first axial distance of given value to having one between should a central point of axis with the Numerical Control, has second axial distance that can be measured between this reference plane and this bottom surface, this adjustment piece is to be installed between this template and the die, and has the 3rd axial distance that can be measured, second degree of depth this second axial distance and the 3rd axial distance and that be not more than this hole;

This second die unit, has a die holder, one die and that is installed in this die holder inside along axis is installed in the adjustment piece of this die one side, this die holder has along should axially foldedly establishing a template and a template of locking, this template has an inner face relative with template, one with the opposing land area of this inner face, one is provided with and is through to by this land area the seat hole of this inner face vertically, it is outer narrow that this hole is, the step shape of inner width, and has an a pair of bigger diameter end portion that should inner face, a pair of path end that should land area, one is big between this, shoulder between the path end, one first degree of depth and that extends to inner face vertically by land area extends to second degree of depth of inner face vertically by this shoulder, this die is to be installed in this hole, and has an a pair of big footpath section that should bigger diameter end portion, one is located at this big footpath section one side and corresponding to the path section of this path end along this axis, a pair of should be greatly footpath section and perpendicular to the bottom surface of this axis, one with the opposing setting in this bottom surface and corresponding to the moulding surface of this path section, one is big between this, path section joining place and perpendicular to the reference plane of this axis, this reference plane and this moulding surface are first axial distance of given value to having one between should a central point of axis with the Numerical Control, has second axial distance that can be measured between this reference plane and this bottom surface, this adjustment piece is to be installed between this template and the die, and has the 3rd axial distance that can be measured, second degree of depth this second axial distance and the 3rd axial distance and that be not more than this hole.

6. the set of molds with can accurate control core thick die as claimed in claim 5, it is characterized in that: the die of this first die unit and second die unit also has one respectively, and to be centered around this moulding surface outside and perpendicular to the breasting face of this axis, this moulding surface is towards being recessed by this breasting.

7. the set of molds with can accurate control core thick die as claimed in claim 5, it is characterized in that: the die of this first die unit and second die unit also has one respectively, and to be centered around this moulding surface outside and perpendicular to the breasting face of this axis, this moulding surface is towards outer protrusion by this breasting.

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