阅读说明：本技术 一种有机玻璃半球形结构均匀压制模具及其压制方法 (Organic glass hemispherical structure uniform pressing die and pressing method thereof ) 是由 张高峰 肖建霞 郭麒 杨一帆 于 2020-06-18 设计创作，主要内容包括：本发明涉及一种有机玻璃半球形结构均匀压制模具及其压制方法,包括PLC控制器、底座和球形模具,球形模具支撑于底座中心上,底座的四周垂直均布三只以上液压升降柱,三只以上液压升降柱的顶部接升降压架四周,升降压架四周均匀错开三只以上液压升降柱朝下挂接平板夹具四周,平板夹具的上、下夹板均为中间镂空大于压制有机玻璃半球形结构直径的环板,上夹板的内环周设置朝上的内圆角翻边,上、下夹板圆周上均布三只以上的电动松紧装置,升降压架中部朝下经多根成型挂杆挂接成型环管,成型环板下方经圆周多根预压挂杆挂接预压环管。该模具结构紧凑、稳定,能满足不同厚度加工,且成品壁厚均匀、无褶皱。(The invention relates to a uniform pressing die for a hemispherical structure of organic glass and a pressing method thereof, and the uniform pressing die comprises a PLC (programmable logic controller), a base and a spherical die, wherein the spherical die is supported on the center of the base, more than three hydraulic lifting columns are vertically and uniformly distributed on the periphery of the base, the tops of the more than three hydraulic lifting columns are connected with the periphery of a lifting pressing frame, the periphery of the lifting pressing frame is uniformly staggered with the periphery of more than three hydraulic lifting columns to downwards hook the periphery of a flat clamp, the upper clamping plate and the lower clamping plate of the flat clamp are ring plates with hollow middle parts larger than the diameter of the hemispherical structure of the organic glass, the inner ring periphery of the upper clamping plate is provided with an upward inner circular angle flanging, more than three electric loosening devices are uniformly distributed on the peripheries of the upper clamping plate and the lower clamping plate, the middle part of the lifting pressing frame is. The die is compact and stable in structure, can meet the requirements of processing of different thicknesses, and the wall thickness of a finished product is uniform and free of wrinkles.)

1. The utility model provides an organic glass semi spherical structure uniform compression mould, includes PLC controller, base and spherical mould, and spherical mould supports on the base center, characterized by: the spherical mold comprises a hemispherical mold head and a columnar bottom mold, the hemispherical mold head is connected with the upper end of the columnar bottom mold and has the same diameter with the columnar bottom mold, and the height of the columnar bottom mold is more than two times of the thickness of the hemispherical structure for pressing the organic glass; more than three hydraulic lifting columns are vertically and uniformly distributed around the base, the more than three hydraulic lifting columns are respectively connected with a hydraulic box through a hydraulic pressure sensor, a pressure balance valve, a flow sensor and a hydraulic pump, the tops of the more than three hydraulic lifting columns are connected with the periphery of a lifting pressing frame, the periphery of the lifting pressing frame is uniformly staggered with the more than three hydraulic lifting columns, the periphery of a flat plate clamp is downwards connected, the flat plate clamp comprises a lower clamp plate, an upper clamp plate and an electric loosening device, the upper clamp plate and the lower clamp plate are ring plates with middle hollowness larger than the diameter of a pressed organic glass hemispherical structure, an upward inner circular angle flanging is arranged on the inner ring periphery of the upper clamp plate, the upper clamp plate and the lower clamp plate are vertically arranged in a state of clamping the organic glass flat plate, more than three electric loosening devices are uniformly distributed on the circumference of the upper clamp plate and the lower clamp plate, each electric loosening device, the elastic support is connected with an elastic pressing plate positioned above the upper clamping plate, a pushing electric cylinder is arranged on the elastic pressing plate, and the lower part of the pushing electric cylinder is connected with an elastic pressing head for pushing and pressing the upper pressing plate; the middle part of the lifting pressing frame is downwards hooked around the prepressing forming device through a plurality of forming hanging rods, the prepressing forming device comprises a forming annular plate, a forming annular pipe and a prepressing annular pipe, the forming annular plate is connected below the forming hanging rods, the forming annular pipe is arranged on the inner periphery of the forming annular plate, the prepressing annular pipe is hooked below the forming annular plate through a plurality of prepressing hanging rods on the periphery, the prepressing annular pipe is concentric with the forming annular pipe, the upper clamping plate, the lower clamping plate and the spherical mold in the vertical direction, the inner fillet flanging diameter, the annular pipe prepressing diameter and the forming annular pipe diameter are sequentially reduced, and the radius of the inner periphery of the forming annular; and the hydraulic pressure sensor, the pressure balance valve, the flow sensor, the hydraulic pump and the pushing electric cylinder are connected with the PLC.

2. The organic glass hemispherical structure uniform pressing die as claimed in claim 1, which is characterized in that: the hydraulic source of the hydraulic lifting column is water.

3. The organic glass hemispherical structure uniform pressing die as claimed in claim 1, which is characterized in that: the upper clamping plate is characterized by comprising an inner ring radius R ', a hemispherical die head radius R, an organic glass flat plate thickness L', an organic glass hemispherical structure thickness L, a forming ring pipe and a prepressing ringThe vertical center distance H of the pipe, the annular radius r' of the prepressing ring pipe, the annular radius r of the forming ring pipe,

4. the organic glass hemispherical structure uniform pressing die as claimed in claim 1, which is characterized in that: the molding hanging rod is a molding lower hanging electric cylinder which is connected with the PLC.

5. The organic glass hemispherical structure uniform pressing die as claimed in claim 1, which is characterized in that: the lifting pressing frame is characterized in that more than three hydraulic lifting columns are uniformly staggered around the lifting pressing frame, paying-off wheels are arranged downwards, more than three paying-off wheels are arranged on the periphery of the base correspondingly to the three paying-off wheels, the paying-off wheels and the paying-off wheels are in one-to-one correspondence with winding pull ropes, the lower end face of the lower clamping plate of the flat plate clamp is externally connected with a penetrating seat extending out of the periphery of the lower clamping plate, the pull ropes are fixedly penetrated on the penetrating seat, the paying-off wheels are connected with a PLC through a paying-off motor, and the.

6. The organic glass hemispherical structure uniform pressing die as claimed in claim 1, which is characterized in that: the bottom of the columnar bottom die is supported on the base through a die pressure sensor, and the die pressure sensor is connected with a PLC (programmable logic controller).

7. A method for uniformly pressing a hemispherical structure of organic glass is characterized by comprising the following steps: the method comprises the following steps:

a. calculating the unfolding area according to the design of a finished hemisphere of an organic glass hemispherical structure, selecting a proper circular organic glass flat plate, blowing and wiping compressed air on the upper surface and the lower surface of an organic glass material, loading the organic glass flat plate on a lower clamping plate of a flat plate clamp, centering the center of the organic glass flat plate, covering an upper clamping plate, controlling an elastic pressure head to tightly press the upper clamping plate through a pushing electric cylinder of an electric elastic device, positioning the organic glass flat plate, and coating talcum powder on a hemisphere die head;

b. the mold is integrally sent into a drying room, heated and softened to the deformation temperature of 120-;

c. in the heat preservation process, the center of the organic glass flat plate sags after being integrally softened, and the PLC controller controls a wire receiving motor to drive the organic glass flat plate to descend through a wire receiving pulley by virtue of a penetrating seat, an upper clamping plate and a lower clamping plate so as to enable the central part of the organic glass flat plate to be attached to the central position of the top of the hemispherical die head;

d. a mould pressure sensor at the bottom of the columnar bottom mould feeds back pressure data of the hemispherical mould head to a PLC (programmable logic controller) in real time, the PLC controls a hydraulic pump to enable a plurality of lifting hydraulic columns to descend synchronously so as to drive a prepressing forming device connected with the PLC to descend at uniform speed, and meanwhile, a take-up pulley takes up wires to drive a flat clamp to descend at uniform speed synchronously;

c. the PLC controller controls the hydraulic pump to pressurize and lift the hydraulic column, and controls the pre-pressing forming device and the flat plate clamp to descend in a set step type section by section;

e. because the diameter of the prepressing ring pipe is larger than that of the pressed organic glass hemispherical structure, when the prepressing ring pipe presses and softens the drooping organic glass flat plate, a larger gap is left between the pressing deformation of the organic glass flat plate and the hemispherical die head; along with the step-type descending of the height of the prepressing circular pipe, the pressure sensor at the bottom of the columnar bottom die feeds back the compression data of the hemispherical die head in real time and decreases progressively, when the compression data decrease to a set value range, the PLC controller controls the electric pushing cylinder to slowly open the clamping degree of the electric pushing clamp plate on the organic glass flat plate, the prepressing circular pipe descends to the set step height in a step-type mode, the pressure sensor at the bottom of the columnar bottom die feeds back the compression data of the hemispherical die head to the PLC controller in real time, the compression data in the step-type section is ensured to be restored to the set value range, the electric pushing clamp plate is closed to clamp the organic glass flat plate, the drawing;

f. through the cyclic operation of the step-type sectional descending action in the step e, the prepressing ring pipe is firstly attached to the surface of the softened and drooped organic glass flat plate, and the gap between the inner surface of the softened organic glass flat plate and the surface of the hemispherical die head is exhausted;

g. in each step e of the step-type sectional descending operation, in each step-type sectional descending operation, the outer surface of the softened organic glass flat plate can be gradually attached to the forming ring pipe above the prepressing ring pipe through the early-stage stretching of the prepressing ring pipe;

h. when the pre-compaction ring canal reaches and surpasses the bottom of mould, accomplish all cascaded decline, the shaping ring canal is laminated completely with dull and stereotyped surface of organic glass and hemisphere die head surface after softening, reaches the height and the diameter requirement of product, begins to cool down the design and handles.

Technical Field

The invention relates to an organic glass mold, in particular to an organic glass hemispherical structure uniform pressing mold.

Background

Organic glass hemispheres, organic glass spheres and other organic glass enclosers are widely applied to the fields of commerce, light industry, building, chemical industry and the like, such as lamp shades, lighting covers, dust covers, protective covers, ocean halls, handicraft products and the like, and the demand is increasing. The prior production process and the defects of the organic glass hemisphere mostly adopt the following methods: 1. the blow molding method of the annular flange mold after the flat plate is softened has the defect of uneven wall thickness of blow molding; 2. the flange mold and mold stretch forming method after the flat plate is softened has the defects of uneven wall thickness and radial strip-shaped folds of a spherical shape; 3. the split molding is followed by splicing polymerization molding, which has the disadvantages of complex process, long manufacturing period and high cost;

therefore, in view of the above problems, it is desirable to develop a new organic glass hemisphere hot bending clamp, an organic glass hot bending system and a pressing control method.

Disclosure of Invention

Aiming at the problems, the invention provides a method and an adjustable die for processing organic glass hemispheres with uniform wall thickness and no wrinkles, which have compact and stable structure and can meet the requirements of different thicknesses.

The technical scheme adopted by the invention is as follows: the utility model provides an organic glass semi spherical structure uniform compression mould, includes PLC controller, base and spherical mould, and spherical mould supports on the base center, characterized by: the spherical mold comprises a hemispherical mold head and a columnar bottom mold, the hemispherical mold head is connected with the upper end of the columnar bottom mold and has the same diameter with the columnar bottom mold, and the height of the columnar bottom mold is more than two times of the thickness of the hemispherical structure for pressing the organic glass; more than three hydraulic lifting columns are vertically and uniformly distributed around the base, the more than three hydraulic lifting columns are respectively connected with a hydraulic box through a hydraulic pressure sensor, a pressure balance valve, a flow sensor and a hydraulic pump, the tops of the more than three hydraulic lifting columns are connected with the periphery of a lifting pressing frame, the periphery of the lifting pressing frame is uniformly staggered with the more than three hydraulic lifting columns, the periphery of a flat plate clamp is downwards connected, the flat plate clamp comprises a lower clamp plate, an upper clamp plate and an electric loosening device, the upper clamp plate and the lower clamp plate are ring plates with middle hollowness larger than the diameter of a pressed organic glass hemispherical structure, an upward inner circular angle flanging is arranged on the inner ring periphery of the upper clamp plate, the upper clamp plate and the lower clamp plate are vertically arranged in a state of clamping the organic glass flat plate, more than three electric loosening devices are uniformly distributed on the circumference of the upper clamp plate and the lower clamp plate, each electric loosening device, the elastic support is connected with an elastic pressing plate positioned above the upper clamping plate, a pushing electric cylinder is arranged on the elastic pressing plate, and the lower part of the pushing electric cylinder is connected with an elastic pressing head for pushing and pressing the upper pressing plate; the middle part of the lifting pressing frame is downwards hooked around the prepressing forming device through a plurality of forming hanging rods, the prepressing forming device comprises a forming annular plate, a forming annular pipe and a prepressing annular pipe, the forming annular plate is connected below the forming hanging rods, the forming annular pipe is arranged on the inner periphery of the forming annular plate, the prepressing annular pipe is hooked below the forming annular plate through a plurality of prepressing hanging rods on the periphery, the prepressing annular pipe is concentric with the forming annular pipe, the upper clamping plate, the lower clamping plate and the spherical mold in the vertical direction, the inner fillet flanging diameter, the annular pipe prepressing diameter and the forming annular pipe diameter are sequentially reduced, and the radius of the inner periphery of the forming annular; and the hydraulic pressure sensor, the pressure balance valve, the flow sensor, the hydraulic pump and the pushing electric cylinder are connected with the PLC.

Further, the hydraulic source of the hydraulic lifting column is water.

Further, the inner ring radius R ' of the upper clamping plate, the radius R of the hemispherical die head, the thickness L ' of the organic glass flat plate, the thickness L of the organic glass hemispherical structure, the vertical center distance H between the forming ring pipe and the prepressing ring pipe, the annular radius R ' of the prepressing ring pipe, the annular radius R of the forming ring pipe,

. Because the diameter of the inner ring of the forming ring pipe is the maximum diameter of the pressing organic glass flat plate drooping and fitting hemispherical die head, the radius difference between the prepressing ring pipe and the forming ring pipe and the vertical center distance between the prepressing ring pipe and the forming ring pipe are mutually restricted, and each step type subsection is ensured to be discharged by the flat plate clampOrganic glass flat plate part can satisfy the tensile demand of pre-compaction, shaping laminating, avoids that traditional organic glass flat plate is whole once only to satisfy the fold that a crimping laminating shaping leads to, has air cavity scheduling problem.

Furthermore, the molding hanging rod is a molding lower hanging electric cylinder which is connected with the PLC.

Furthermore, the lifting pressing frame is uniformly staggered with more than three hydraulic lifting columns around and downwards provided with paying-off wheels, the base is provided with more than three paying-off wheels corresponding to the more than three paying-off wheels around and provided with more than three take-up wheels, the paying-off wheels and the take-up wheels are wound with pull ropes in a one-to-one correspondence manner, the lower end surface of the lower clamping plate of the flat plate clamp is externally connected with and extends out of a peripheral penetrating seat, the pull ropes are fixedly penetrated on the penetrating seat, the paying-off wheels are connected with a PLC (programmable logic controller) through paying-off motors.

Furthermore, the bottom of the columnar bottom die is supported on the base through a die pressure sensor, and the die pressure sensor is connected with the PLC.

A method for uniformly pressing a hemispherical structure of organic glass is characterized by comprising the following steps: the method comprises the following steps:

a. calculating the unfolding area according to the design of a finished hemisphere of an organic glass hemispherical structure, selecting a proper circular organic glass flat plate, blowing and wiping compressed air on the upper surface and the lower surface of an organic glass material, loading the organic glass flat plate on a lower clamping plate of a flat plate clamp, centering the center of the organic glass flat plate, covering an upper clamping plate, controlling an elastic pressure head to tightly press the upper clamping plate through a pushing electric cylinder of an electric elastic device, positioning the organic glass flat plate, and coating talcum powder on a hemisphere die head;

b. the mold is integrally sent into a drying room, heated and softened to the deformation temperature of 120-;

c. in the heat preservation process, the center of the organic glass flat plate sags after being integrally softened, and the PLC controller controls a wire receiving motor to drive the organic glass flat plate to descend through a wire receiving pulley by virtue of a penetrating seat, an upper clamping plate and a lower clamping plate so as to enable the central part of the organic glass flat plate to be attached to the central position of the top of the hemispherical die head;

d. a mould pressure sensor at the bottom of the columnar bottom mould feeds back pressure data of the hemispherical mould head to a PLC (programmable logic controller) in real time, the PLC controls a hydraulic pump to enable a plurality of lifting hydraulic columns to descend synchronously so as to drive a prepressing forming device connected with the PLC to descend at uniform speed, and meanwhile, a take-up pulley takes up wires to drive a flat clamp to descend at uniform speed synchronously;

c. the PLC controller controls the hydraulic pump to pressurize and lift the hydraulic column, and controls the pre-pressing forming device and the flat plate clamp to descend in a set step type section by section;

e. because the diameter of the prepressing ring pipe is larger than that of the pressed organic glass hemispherical structure, when the prepressing ring pipe presses and softens the drooping organic glass flat plate, a larger gap is left between the pressing deformation of the organic glass flat plate and the hemispherical die head; along with the step-type descending of the height of the prepressing circular pipe, the pressure sensor at the bottom of the columnar bottom die feeds back the compression data of the hemispherical die head in real time and decreases progressively, when the compression data decrease to a set value range, the PLC controller controls the electric pushing cylinder to slowly open the clamping degree of the electric pushing clamp plate on the organic glass flat plate, the prepressing circular pipe descends to the set step height in a step-type mode, the pressure sensor at the bottom of the columnar bottom die feeds back the compression data of the hemispherical die head to the PLC controller in real time, the compression data in the step-type section is ensured to be restored to the set value range, the electric pushing clamp plate is closed to clamp the organic glass flat plate, the drawing;

f. through the cyclic operation of the step-type sectional descending action in the step e, the prepressing ring pipe is firstly attached to the surface of the softened and drooped organic glass flat plate, and the gap between the inner surface of the softened organic glass flat plate and the surface of the hemispherical die head is exhausted;

g. in each step e of the step-type sectional descending operation, in each step-type sectional descending operation, the outer surface of the softened organic glass flat plate can be gradually attached to the forming ring pipe above the prepressing ring pipe through the early-stage stretching of the prepressing ring pipe;

h. when the pre-compaction ring canal reaches and surpasses the bottom of mould, accomplish all cascaded decline, the shaping ring canal is laminated completely with dull and stereotyped surface of organic glass and hemisphere die head surface after softening, reaches the height and the diameter requirement of product, begins to cool down the design and handles.

The invention adopts a lifting hydraulic column to control a preforming device, controls a flat clamp by combining a synchronous paying-off pull rope, realizes multi-step subsection descending of the preforming device and the flat clamp, feeds back pressure data of a hemispherical die head to each step type subsection die pressure sensor in real time by controlling the ratio of the annular radius difference between a prepressing circular pipe and a forming circular pipe to the vertical center distance, controls and releases the clamping degree of the flat clamp on an organic glass flat plate, ensures that the pressure data in each step type subsection is within a set value range, and ensures that the prepressing circular pipe and the forming circular pipe can keep set drawing force so that a gap between the inner surface of the softened organic glass flat plate and the surface of the hemispherical die head forms bonding drawing with the. The mould pressing method calculates and controls the size of the mould part according to the radius and the thickness of the organic glass flat plate and the finished product hemisphere structure, sets the stepped segmented circulating operation of pre-pressing in stages, stretching of the organic glass template and re-forming pressing, can reduce the generation of spherical longitudinal direction wrinkles generated by excessive extrusion of the organic glass plate in the spherical latitude direction during one-time mould pressing, can also take into account the uniform control of the mould pressing thickness, and improves the mould pressing quality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: the device comprises a base 1, a support frame 2, a die pressure sensor 3, a columnar bottom die 4, a hemispherical die head 5, a hydraulic lifting column 6, a hydraulic pressure sensor 7, a pressure balance valve 8, a flow sensor 9, a hydraulic pump 10, a water tank 11, a lifting pressing frame 12, a paying-off wheel 13, a paying-off motor 14, a pulling rope 15, a take-up wheel 16, a take-up motor 17, a cross-under seat 18, a lower clamping plate 19, an upper clamping plate 20, an inner fillet flanging 21, an elastic support 22, an elastic pressing plate 23, a pushing electric cylinder 24, an elastic pressing head 25, a forming hanging rod 26, a forming ring pipe 28, a pre-pressing hanging rod 29, a pre-pressing ring pipe 30.

Detailed Description

The following further description is made in conjunction with the accompanying drawings and examples.

In fig. 1: the utility model provides an organic glass hemispherical structure evenly presses mould includes base 1, support frame 2, mould pressure sensor 3, column die block 4, hemisphere die head 5, hydraulic pressure lift post 6, hydraulic pressure force sensor 7, pressure balance valve 8, flow sensor 9, hydraulic pump 10, water tank 11, lift pressure frame 12, actinobacillus wheel 13, unwrapping wire motor 14, stay cord 15, take-up pulley 16, receive line motor 17, cross-under seat 18, lower plate 19, upper plate 20, interior fillet turn-ups 21, elasticity support 22, elasticity clamp plate 23, propelling movement electric cylinder 24, elasticity pressure head 25, shaping peg 26, shaping ring pipe 28, pre-compaction peg 29, pre-compaction ring pipe 30, PLC controller 31.

A cylindrical bottom die 4 is supported on the center of the base 1 through a support frame 2 through a die pressure sensor 3, a connected hemispherical die head 5 with the same diameter is arranged on the cylindrical bottom die 4, and the height of the cylindrical bottom die is more than twice of the thickness of a pressed organic glass hemispherical structure; four hydraulic lifting columns 6 are vertically and uniformly distributed at four corners of a base 1, a water tank 11 supplies pressure through a pressure balance valve 8, a hydraulic pressure sensor 7, a flow sensor 9 and a hydraulic pump 10 respectively, the tops of the four hydraulic lifting columns are connected with four corners of a lifting pressing frame 12, a paying-off motor 14 with a paying-off wheel 13 is arranged at the center of the periphery of the lifting pressing frame 12, a paying-off wheel 16 with a paying-off motor 17 is arranged at the center of the peripheral frame of the base 1 corresponding to the paying-off wheel, the paying-off wheel and the paying-off wheel are wound with a pull rope 15, a penetrating seat 18 is penetrated and connected at the middle part of the pull rope 15, four penetrating seats 18 are connected at the periphery 19 of an annular lower clamping plate, an upper clamping plate 20 is arranged on the lower clamping plate, the upper clamping plate and the lower clamping plate are annular plates with the middle parts larger than the diameter of a pressed organic glass hemispherical structure, upward inner ring flanging 21 is, the elastic support 22 is connected with an elastic pressing plate 23 positioned above the upper clamping plate 20, a pushing electric cylinder 24 is arranged on the elastic pressing plate, and the lower part of the pushing electric cylinder is connected with an elastic pressing head 25 for pushing and pressing the upper pressing plate; the middle part of the lifting pressing frame 12 is downwards connected with a forming ring pipe 28 through a plurality of forming hanging rods 26, a prepressing ring pipe 30 is connected with the lower part of the forming ring plate through a plurality of prepressing hanging rods 29 on the circumference, the prepressing ring pipe is concentric with the forming ring pipe, the upper clamping plate, the lower clamping plate and the spherical mould in the vertical direction, the diameter of the inner fillet flanging, the diameter of the prepressing ring pipe and the diameter of the forming ring pipe are sequentially decreased, and the radius of the inner circumference of the forming ring pipe is equal to the radius; and the hydraulic pressure sensor, the pressure balance valve, the flow sensor, the hydraulic pump and the pushing electric cylinder are connected with the PLC.

In this embodiment: the radius R ' of the inner ring of the upper clamping plate, the radius R of the hemispherical die head, the thickness L ' of the organic glass flat plate, the thickness L of the organic glass hemispherical structure, the vertical center distance H between the formed ring pipe and the prepressing ring pipe, the annular radius R ' of the prepressing ring pipe, the annular radius R of the formed ring pipe,。

the mold of the embodiment is adopted to uniformly press the hemispherical structure of the organic glass, and the method comprises the following steps:

a. calculating the unfolding area according to the design of a finished hemisphere of an organic glass hemispherical structure, selecting a proper circular organic glass flat plate, blowing and wiping compressed air on the upper surface and the lower surface of an organic glass material, loading the organic glass flat plate on a lower clamping plate of a flat plate clamp, centering the center of the organic glass flat plate, covering an upper clamping plate, controlling an elastic pressure head to tightly press the upper clamping plate through a pushing electric cylinder of an electric elastic device, positioning the organic glass flat plate, and coating talcum powder on a hemisphere die head;

b. the mold is integrally sent into a drying room, heated and softened to the deformation temperature of 120-;

c. in the heat preservation process, the center of the organic glass flat plate sags after being integrally softened, and the PLC controller controls a wire receiving motor to drive the organic glass flat plate to descend through a wire receiving pulley by virtue of a penetrating seat, an upper clamping plate and a lower clamping plate so as to enable the central part of the organic glass flat plate to be attached to the central position of the top of the hemispherical die head;

d. a mould pressure sensor at the bottom of the columnar bottom mould feeds back pressure data of the hemispherical mould head to a PLC (programmable logic controller) in real time, the PLC controls a hydraulic pump to enable a plurality of lifting hydraulic columns to descend synchronously so as to drive a prepressing forming device connected with the PLC to descend at uniform speed, and meanwhile, a take-up pulley takes up wires to drive a flat clamp to descend at uniform speed synchronously;

c. the PLC controller controls the hydraulic pump to pressurize and lift the hydraulic column, and controls the pre-pressing forming device and the flat plate clamp to descend in a set step type section by section;

e. because the diameter of the prepressing ring pipe is larger than that of the pressed organic glass hemispherical structure, when the prepressing ring pipe presses and softens the drooping organic glass flat plate, a larger gap is left between the pressing deformation of the organic glass flat plate and the hemispherical die head; along with the step-type descending of the height of the prepressing circular pipe, the pressure sensor at the bottom of the columnar bottom die feeds back the compression data of the hemispherical die head in real time and decreases progressively, when the compression data decrease to a set value range, the PLC controller controls the electric pushing cylinder to slowly open the clamping degree of the electric pushing clamp plate on the organic glass flat plate, the prepressing circular pipe descends to the set step height in a step-type mode, the pressure sensor at the bottom of the columnar bottom die feeds back the compression data of the hemispherical die head to the PLC controller in real time, the compression data in the step-type section is ensured to be restored to the set value range, the electric pushing clamp plate is closed to clamp the organic glass flat plate, the drawing;

f. through the cyclic operation of the step-type sectional descending action in the step e, the prepressing ring pipe is firstly attached to the surface of the softened and drooped organic glass flat plate, and the gap between the inner surface of the softened organic glass flat plate and the surface of the hemispherical die head is exhausted;

g. in each step e of the step-type sectional descending operation, in each step-type sectional descending operation, the outer surface of the softened organic glass flat plate can be gradually attached to the forming ring pipe above the prepressing ring pipe through the early-stage stretching of the prepressing ring pipe;

h. when the pre-compaction ring canal reaches and surpasses the bottom of mould, accomplish all cascaded decline, the shaping ring canal is laminated completely with dull and stereotyped surface of organic glass and hemisphere die head surface after softening, reaches the height and the diameter requirement of product, begins to cool down the design and handles.