Chalcogenide glass small-diameter rod molding device and process

Abstract

The application belongs to the technical field of glass material mould pressing and relates to a chalcogenide glass small-diameter rod material mould pressing forming device and process. The mould pressing forming device comprises a mould for placing a mould material, a constant-temperature box for heating the mould, and a mould pressing mechanism for mould pressing the mould material in the mould; the mould comprises a mould sleeve, a mould core and a pressure head, the mould pressing mechanism is provided with a pressure rod, and the constant-temperature box is provided with a box body for accommodating the mould; the mould sleeve comprises a mould sleeve base and a mould sleeve pipe arranged on the mould sleeve base, the mould core is a columnar structure formed by splicing at least two mould core blocks and locking and fixing through the mould sleeve, and the mould core is provided with a plurality of mould pressing holes with opening directions towards the mould material in the mould pressing direction. The chalcogenide glass small-diameter rod material mould pressing forming device has a simple structure, adopts a mould pressing design, can replace mould cores of different specifications, and prepares small-diameter chalcogenide glass rod materials of different specifications; meanwhile, the problem that a glass rod prepared by a traditional extrusion method is prone to large diameter deviation and bending is solved.

Description

Technical Field

[0001] This invention belongs to the field of glass material molding technology, and relates to a molding apparatus and process for small-diameter rods of chalcogenide glass. Background Technology

[0002] Chalcogenide glasses are amorphous materials formed from chalcogen elements (including sulfur, selenium, and tellurium), exhibiting excellent transmittance in the 3–5 μm and 8–14 μm wavelength ranges. Compared to crystalline infrared materials, chalcogenide glasses offer advantages such as better uniformity, continuously tunable performance, ease of fabrication, and lower production costs. Chalcogenide glass lenses are finding increasingly widespread applications in military and civilian fields, including battlefield reconnaissance, vehicle navigation, security monitoring, fire source location in firefighting, rapid temperature measurement in medical diagnosis, and infrared night vision equipment.

[0003] In the civilian sector, the aperture of chalcogenide glass lenses used is generally 10~40mm, and lenses of this aperture require the use of chalcogenide glass rods of the corresponding diameter for processing.

[0004] Currently, such small-diameter chalcogenide glass rods are generally prepared using three methods:

[0005] (1) Small-diameter chalcogenide glass rods are prepared by directly using conventional quartz ampoules to melt and quench. This method requires a large number of quartz ampoules to prepare small-diameter chalcogenide glass rods, resulting in low production efficiency and high preparation cost.

[0006] (2) First, a large-diameter chalcogenide glass rod with a diameter ≥100mm is prepared by melting and quenching a quartz ampoule. Then, a small-diameter chalcogenide glass rod is made by using a hollow drill bit, or by cutting it into a cuboid and then processing it into a chalcogenide glass rod by a rolling machine. This method wastes a lot of chalcogenide glass material, and the material utilization rate is less than 60%, which results in a high cost of glass rod preparation.

[0007] (3) First, a large-diameter chalcogenide glass rod with a diameter ≥100mm is prepared by melting and quenching a quartz ampoule. Then, the large-diameter chalcogenide glass rod prepared by melting is extruded into a small-diameter chalcogenide glass rod by extrusion molding. The diameter of the small-diameter chalcogenide glass rod produced by this extrusion method is difficult to control, and problems such as large diameter deviation, deformation, and bending are likely to occur, resulting in unstable product quality and low material utilization. Summary of the Invention

[0008] To address the aforementioned problems in the existing technology, the purpose of this invention is to provide a highly efficient and stable device and process for molding small-diameter rods of chalcogenide glass, which can significantly improve production efficiency, reduce production costs, and enhance product competitiveness.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A molding apparatus for small-diameter rods of chalcogenide glass, the molding apparatus comprising a mold for placing the molding material, a constant temperature chamber for heating the mold, and a molding mechanism for molding the molding material placed in the mold;

[0011] The mold includes a mold sleeve, a mold core, and a pressure head; the molding mechanism is equipped with a pressure rod; and the constant temperature chamber is equipped with a box to house the mold.

[0012] The mold sleeve includes a mold sleeve base and a mold sleeve tube disposed on the mold sleeve base. The mold sleeve tube is a tubular structure with one open end, formed by splicing at least two mold sleeve blocks and locking them together with a locking assembly. The inner wall of the mold sleeve block forms an inner cavity to accommodate the mold core and the pressure head. The pressure rod of the molding mechanism passes through the housing and is connected to one end of the pressure head. The other end of the pressure head is placed between the mold core and the mold material. The outer wall of the mold core and the outer wall of the pressure head are fitted with the inner wall of the inner cavity.

[0013] The mold core is a columnar structure formed by splicing at least two mold core blocks and locking them together with a mold sleeve. The mold core has multiple molding holes with openings facing the mold material in the molding direction.

[0014] Among them, the splicing seams formed by adjacent mold sleeve blocks and the splicing seams formed by adjacent mold core blocks are set along the molding direction, and the splicing seams formed by adjacent mold core blocks are connected to the molding holes.

[0015] Furthermore, the mold base is composed of at least two mold base blocks spliced ​​together, and the number of mold base blocks is consistent with the number of mold blocks and corresponds one-to-one; more preferably, the corresponding mold block and the mold base block are integrally formed.

[0016] Furthermore, the mold sleeve includes a left mold sleeve and a right mold sleeve arranged symmetrically; the left mold sleeve is provided with an embedding protrusion along the molding direction, and the right mold sleeve is provided with an embedding groove that matches the embedding protrusion along the molding direction.

[0017] Furthermore, the mold core includes a plurality of mold core blocks that are sequentially spliced ​​together in a direction perpendicular to the molding direction, and matching molding grooves are provided on the splicing surfaces of adjacent mold core blocks; after splicing, the molding grooves on adjacent mold core blocks combine to form a molding hole.

[0018] Furthermore, the molding holes are provided through both ends of the mold core.

[0019] Furthermore, the bottom of the mold sleeve is provided with an exhaust port; the bottom of the mold core is provided with an exhaust groove communicating with the exhaust port, and the exhaust groove communicating with the exhaust port and the molding hole; more preferably, the exhaust groove is provided with a transverse exhaust groove and a longitudinal exhaust groove.

[0020] Furthermore, the locking component is an annular buckle fitted onto the mold sleeve.

[0021] Furthermore, the heating assembly includes a constant temperature chamber, which includes a chamber body, a heater, and a heating plate. The heating plate is disposed at the bottom of the chamber body, the heater is disposed on the side wall of the chamber body, and the mold is placed on the heating plate inside the chamber body.

[0022] More preferably, the heating assembly further includes an external constant temperature chamber.

[0023] Furthermore, the molding mechanism includes a servo motor, a gearbox, a pressure rod, and a pressure sensor. The servo motor is connected to one end of the pressure rod through the gearbox, the pressure sensor is installed on the pressure rod, and the other end of the pressure rod is connected to the pressure head of the mold.

[0024] More preferably, the connection end between the pressure rod and the pressure head is set as a ball head, and the pressure head is provided with a countersunk spherical groove adapted to the ball head.

[0025] A process for molding small-diameter rods of chalcogenide glass, using the aforementioned molding apparatus for small-diameter rods of chalcogenide glass, includes the following steps:

[0026] (1) Place the chalcogenide glass rod in the inner cavity of the mold, with the mold core below the chalcogenide glass rod and the pressure head above the chalcogenide glass rod, and lock the mold sleeve by locking the locking assembly;

[0027] (2) After the chalcogenide glass rod and the mold are assembled, they are first placed in an external constant temperature box for preheating treatment;

[0028] (3) After the chalcogenide glass rod and mold are preheated, they are placed in the constant temperature chamber of the molding device for further heating so that the chalcogenide glass material is fully softened;

[0029] (4) After the heat preservation is completed, start the molding mechanism, control the pressure bar to press down until the pressure head reaches the top of the mold core or reaches the set pressure limit to stop pressing, and control the pressure bar to return to the origin;

[0030] (5) Transfer the mold to an external annealing furnace and keep it at the Tg temperature of the chalcogenide glass material. After the heat preservation is completed, perform annealing treatment. After the annealing is completed, remove the mold and disassemble it to obtain the molded small diameter chalcogenide glass rod product.

[0031] Further, in step (2), the temperature is raised to 10-20°C above the Ts temperature of the chalcogenide glass material in an external constant temperature chamber at a heating rate of 10-20°C / h, and kept at that temperature for 2-3 hours.

[0032] Further, in step (3), the temperature of the mold and the chalcogenide glass rod is heated to 40~70°C above the Ts temperature of the chalcogenide glass material, and kept at that temperature for 1~3 hours to allow the chalcogenide glass material to soften fully.

[0033] Furthermore, in step (4), the pressure bar is controlled to press downward at a rate of 3~10 mm / min.

[0034] Furthermore, in step (5), the annealing furnace is kept at the Tg temperature of the chalcogenide glass material for 3-5 hours. After the holding period, the temperature is reduced to room temperature at a rate of 5-10℃ / h for annealing treatment.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] (1) The chalcogenide glass small diameter rod molding device of the present invention has a simple structure and adopts a mold molding design. Different specifications of mold cores can be replaced at will to prepare small diameter chalcogenide glass rods of different specifications. At the same time, it solves the problem that glass rods prepared by traditional extrusion methods are prone to large diameter deviation and easy bending.

[0037] (2) The structure of the chalcogenide glass small-diameter rod molding apparatus of the present invention is improved as follows:

[0038] The mold adopts a modular design, and the mold can be disassembled and combined. Various mold cores of different specifications can be replaced to produce products of different specifications.

[0039] The mold sleeve adopts an embedded combination design, which can be quickly positioned and locked to enhance its firmness. The bottom is designed with an exhaust port to discharge the gas inside the mold core and prevent gas from mixing into the glass rod and affecting product quality.

[0040] The mold core adopts a modular design, which allows for quick demolding of the product and is less likely to cause damage. The bottom is designed with an exhaust port to release the gas inside the mold core and prevent gas from mixing into the glass rod and affecting product quality.

[0041] The constant temperature chamber uses a dual heating method of heater-driven air convection radiation heating and bottom heating plate heat conduction to heat the mold, which has high heating efficiency and stable temperature field, and is conducive to the rapid softening of chalcogenide glass materials.

[0042] The bottom of the ejector pin of the molding mechanism adopts a ball head design, and the pressure head adopts a countersunk spherical design, which helps the pressure head to keep vertical downward pressure; the mechanical transmission design allows for constant speed transmission.

[0043] (3) The present invention uses an external constant temperature box to preheat the chalcogenide glass material and the mold, and sets the mold core as a multi-porous combination structure, which can simultaneously prepare multiple small-diameter glass rods. Compared with the traditional extrusion molding method that uses chalcogenide glass rods to be heated and softened in the extrusion device for extrusion, the present invention saves more time and improves the working efficiency by more than 2 times.

[0044] (4) The chalcogenide glass rods prepared using the apparatus and method of the present invention have small diameter deviation and small curvature, and the product utilization rate is high. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a schematic diagram of the chalcogenide glass small-diameter rod molding apparatus in Example 1;

[0047] Figure 2 This is a side view of the mold structure in Example 1;

[0048] Figure 3 This is a top view of the mold structure in Example 1;

[0049] Figure 4 This is a schematic diagram of the assembly structure of the mold in Example 1;

[0050] Figure 5 This is a schematic diagram of the longitudinal cross-sectional structure of the mold core in Example 1;

[0051] Figure 6 This is a schematic diagram of the transverse cross-sectional structure of the mold core in Example 1;

[0052] Figure 7 This is a side view of the mold core in the spliced ​​state in Example 1;

[0053] Figure 8 This is a bottom view of the mold core assembly in Example 1.

[0054] Wherein: 1—Mold, 11—Mold sleeve, 111—Left mold sleeve, 112—Right mold sleeve, 113—Exhaust port, 114—Embedded groove, 115—Embedded protrusion, 12—Mold core, 121—Exhaust groove, 13—Pressure head, 14—Annular buckle, 2—Constant temperature chamber, 21—Heater, 22—Heating plate, 23—Blower fan, 24—Box body, 3—Molding mechanism, 31—Servo motor, 32—Gearbox, 33—Pressure rod, 34—Pressure sensor, 35—Bracket, 4—Chalcogenide glass rod. Detailed Implementation

[0055] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0056] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0057] Example 1

[0058] like Figures 1-8 As shown, this embodiment discloses a molding apparatus for small-diameter rods of chalcogenide glass, including a mold 1 for placing the molding material, a constant temperature chamber 2 for heating the mold, and a molding mechanism 3 for molding the molding material placed in the mold 1.

[0059] The mold 1 includes a mold sleeve 11, a mold core 12 and a pressure head 13, the molding mechanism 3 is provided with a pressure rod 33, and the constant temperature box 2 is provided with a box body 24 to accommodate the mold 1;

[0060] The mold sleeve 11 includes a mold sleeve base and a mold sleeve tube disposed on the mold sleeve base. The mold sleeve tube is a tubular structure with one end open, formed by splicing at least two mold sleeve blocks and locking them together by a locking assembly. The inner wall of the mold sleeve block forms an inner cavity to accommodate the mold core 12 and the pressure head 13. The pressure rod 33 of the molding mechanism 3 passes through the housing 24 and is connected to one end of the pressure head 13. The other end of the pressure head 13 is placed between the mold core 12 and the mold material. The outer wall of the mold core 12 and the outer wall of the pressure head 13 are in contact with the inner wall of the inner cavity.

[0061] The mold core 12 is a columnar structure formed by splicing at least two mold core blocks and locking them together with a mold sleeve. The mold core 12 has multiple mold holes with openings facing the mold material in the molding direction.

[0062] Among them, the splicing seams formed by adjacent mold sleeve blocks and the splicing seams formed by adjacent mold core blocks are set along the molding direction, and the splicing seams formed by adjacent mold core blocks are connected to the molding holes.

[0063] In this embodiment, the mold sleeve 11 includes a left mold sleeve 111 and a right mold sleeve 112 arranged symmetrically; the left mold sleeve 111 is provided with an embedding protrusion 115 along the molding direction, and the right mold sleeve 112 is provided with an embedding groove 114 that matches the embedding protrusion 115 along the molding direction.

[0064] In this embodiment, the mold base is composed of at least two mold base blocks spliced ​​together, and the number of mold base blocks is consistent with the number of mold blocks and corresponds one-to-one; the corresponding mold block and the mold base block are integrally formed.

[0065] In this embodiment, the mold core 12 includes a plurality of mold core blocks that are sequentially spliced ​​together in a direction perpendicular to the molding direction, and matching molding grooves are provided on the splicing surfaces of adjacent mold core blocks; after splicing, the molding grooves on adjacent mold core blocks combine to form a molding hole.

[0066] In this embodiment, the molding hole is provided through both ends of the mold core 12.

[0067] In this embodiment, the bottom of the mold sleeve 11 is provided with an exhaust port 113; the bottom of the mold core is provided with an exhaust groove 121 communicating with the exhaust port 113, and the exhaust groove 121 is provided through the molding hole; the exhaust groove 121 is provided with a transverse exhaust groove and a longitudinal exhaust groove.

[0068] In this embodiment, the locking component is an annular buckle 14 sleeved on the mold sleeve.

[0069] In this embodiment, the heating assembly includes a constant temperature chamber 2, which includes a chamber body 24, a heater 21, and a heating plate 22. The heating plate 22 is disposed at the bottom of the chamber body 24, the heater 21 is disposed on the side wall of the chamber body 24, and the mold 1 is placed on the heating plate 22 inside the chamber body 24.

[0070] In this embodiment, the molding mechanism 3 includes a servo motor 31, a gearbox 32, a pressure rod 33, and a pressure sensor 34. The servo motor 31 is connected to one end of the pressure rod 33 through the gearbox 32. The pressure sensor 34 is installed on the pressure rod 33. The other end of the pressure rod 33 is connected to the pressure head 13 of the mold 1.

[0071] In this embodiment, the connection end between the pressure rod 33 and the pressure head 13 is set as a ball head, and the pressure head 13 is provided with a countersunk spherical groove that is adapted to the ball head.

[0072] Example 2

[0073] This embodiment discloses a compression molding process for small-diameter rods of chalcogenide glass, using a compression molding apparatus for small-diameter rods of chalcogenide glass as described in Embodiment 1. The specific process and parameter settings are as follows:

[0074] This compression molding apparatus was used to mold small-diameter chalcogenide glass rods with a diameter of 20 mm and a length of 200 mm. The mold inner diameter was 100 mm, and the mold core was a 9-hole design with an inner diameter of 20.2 mm and a length of 200 mm. The molding material used was As with a diameter of 100 mm and a height of 75 mm. 40 Se 60 4. Chalcogenide glass rod.

[0075] The bottom of the mold sleeve, the inner hole of the mold core, and the pressure head are treated with a release agent spray to remove As 40 Se 60 A chalcogenide glass rod 4 is placed inside the mold cavity, with the mold core located at As. 40 Se60 Below the chalcogenide glass rod 4, the indenter is located at As 40 Se 60 Above the chalcogenide glass rod 4, a fixed mold sleeve is locked in place by a ring buckle.

[0076] As 40 Se 60 After the chalcogenide glass rod 4 and the mold are assembled, they are first placed in an external constant temperature chamber. The external constant temperature chamber raises the temperature to 230℃ at a heating rate of 10℃ / h and holds it at that temperature for 2.5h to test As. 40 Se 60 The chalcogenide glass rod 4 is preheated.

[0077] The constant temperature chamber of the compression molding device is preheated to 230℃. 40 Se 60 After the chalcogenide glass rod 4 and the mold are preheated, they are transferred to the constant temperature chamber of the molding apparatus. The constant temperature chamber is then heated to 270℃ at a rate of 50℃ / h and held for 2 hours, so that As... 40 Se 60 The chalcogenide glass rod 4 was fully softened.

[0078] After the heat preservation is completed, start the molding mechanism and control the pressure bar to press downwards at a rate of 5mm / min until the pressure head reaches above the mold core and stops molding. Then control the pressure bar to return to the origin.

[0079] The mold was transferred to an external annealing furnace heated to 180°C and held for 5 hours. Then, it was cooled to room temperature at a rate of 5°C / h for annealing. After the annealing furnace temperature dropped to room temperature, the mold was removed and disassembled to obtain nine small-diameter chalcogenide glass rods with a diameter of 20mm and a length of 200mm, which were molded.

[0080] Comparative Example 1

[0081] The raw materials for this comparative example are the same as those in Example 1, using a 100mm diameter and 75mm long As... 40 Se 60 A small-diameter chalcogenide glass rod with a diameter of 20 mm and a length of 200 mm was prepared.

[0082] The difference is that this comparative example uses the extrusion molding device and process for small-diameter chalcogenide glass rods provided by Chinese Patent No. CN105198191A to complete one extrusion and prepare small-diameter chalcogenide glass rods with a diameter of 20mm and a length of 200mm.

[0083] The small-diameter chalcogenide glass rods obtained in Example 2 and Comparative Example 1 were compared experimentally, and the comparison results are shown in Table 1:

[0084] Table 1

[0085]

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A device for molding small-diameter rods of chalcogenide glass, characterized in that, The molding apparatus includes a mold (1) for placing the molding material, a heating component for heating the mold, and a molding mechanism (3) for molding the molding material placed in the mold (1). The mold (1) includes a mold sleeve (11), a mold core (12) and a pressure head (13), and the molding mechanism (3) is provided with a pressure bar (33). The mold sleeve (11) includes a mold sleeve base and a mold sleeve tube disposed on the mold sleeve base. The mold sleeve tube is a tubular structure with one end open, formed by splicing at least two mold sleeve blocks and locking them together with a locking assembly. The inner wall of the mold sleeve block forms an inner cavity that accommodates the mold core (12) and the pressure head (13). The pressure rod (33) of the molding mechanism (3) passes through the housing (24) and is connected to one end of the pressure head (13). The other end of the pressure head (13) is placed between the mold core (12) and the mold material. The outer wall of the mold core (12), the outer wall of the pressure head (13) and the inner wall of the inner cavity are in contact. The mold core (12) is a columnar structure formed by splicing at least two mold core blocks and locking them together with a mold sleeve. The mold core (12) has multiple mold holes with openings facing the mold material in the molding direction. Among them: the splicing seam formed by adjacent mold sleeve blocks and the splicing seam formed by adjacent mold core blocks are both set along the molding direction, and the splicing seam formed by adjacent mold core blocks is connected to the molding hole; The mold core (12) includes a plurality of mold core blocks that are sequentially spliced ​​in a direction perpendicular to the molding direction, and matching molding grooves are provided on the splicing surfaces of adjacent mold core blocks; after splicing, the molding grooves on adjacent mold core blocks combine to form a molding hole; The bottom of the mold sleeve (11) is provided with an exhaust port (113); the bottom of the mold core (12) is provided with an exhaust groove (121) communicating with the exhaust port (113), and the exhaust groove (121) communicates with the exhaust port (113) and the molding hole; The heating assembly includes a constant temperature chamber (2), which includes a box body (24) for accommodating the mold (1), a heater (21), and a heating plate (22). The heating plate (22) is located at the bottom of the box body (24), the heater (21) is located on the side wall of the box body (24), and the mold (1) is placed on the heating plate (22) inside the box body (24). The molding mechanism (3) includes a servo motor (31), a gearbox (32), a pressure rod (33) and a pressure sensor (34). The servo motor (31) is connected to one end of the pressure rod (33) through the gearbox (32). The pressure sensor (34) is installed on the pressure rod (33). The other end of the pressure rod (33) is connected to the pressure head (13) of the mold (1).

2. The chalcogenide glass small-diameter rod molding apparatus as described in claim 1, characterized in that, The mold sleeve (11) includes a left mold sleeve (111) and a right mold sleeve (112) arranged symmetrically; the left mold sleeve (111) is provided with an embedding protrusion (115) along the molding direction, and the right mold sleeve (112) is provided with an embedding groove (114) that matches the embedding protrusion (115) along the molding direction.

3. The chalcogenide glass small-diameter rod molding apparatus as described in claim 1, characterized in that, The locking component is an annular buckle (14) sleeved on the mold sleeve.

4. The chalcogenide glass small-diameter rod molding apparatus as described in claim 1, characterized in that, The connection end between the pressure rod (33) and the pressure head (13) is set as a ball head, and the pressure head (13) is provided with a countersunk spherical groove that is adapted to the ball head.

5. A molding process for small-diameter rods of chalcogenide glass, characterized in that, The apparatus for molding small-diameter rods of chalcogenide glass according to any one of claims 1 to 4 includes the following steps: (1) Place the chalcogenide glass rod (4) in the inner cavity of the mold (1), with the mold core (12) located below the chalcogenide glass rod (4) and the pressure head (13) located above the chalcogenide glass rod (4). Lock the mold sleeve (11) by locking the locking assembly. (2) After the chalcogenide glass rod (4) and the mold (1) are assembled, they are first placed in an external constant temperature box for preheating treatment; (3) After the chalcogenide glass rod (4) and mold (1) are preheated, they are placed in the constant temperature box (2) of the molding device for further heating so that the chalcogenide glass material is fully softened; (4) After the heat preservation is completed, start the molding mechanism (3), control the pressure bar (33) to press down until the pressure head reaches the top of the mold core or reaches the set pressure limit to stop pressing, and control the pressure bar (33) to return to the origin; (5) Transfer the mold (1) to an external annealing furnace and keep it at the Tg temperature of the chalcogenide glass material. After the heat preservation is completed, lower it to room temperature for annealing. After the annealing is completed, take out the mold and disassemble it to obtain the molded small diameter chalcogenide glass rod product. in: In step (2), the temperature is raised to 10-20°C above the Ts temperature of the chalcogenide glass material in an external constant temperature chamber at a heating rate of 10-20°C / h, and kept at that temperature for 2-3 hours. In step (3), the temperature of the mold (1) and the chalcogenide glass rod (4) is heated to 40~70°C above the Ts temperature of the chalcogenide glass material, and kept at that temperature for 1~3 hours to allow the chalcogenide glass material to soften fully. In step (4), the control lever (33) is pressed downward at a rate of 3~10 mm / min; In step (5), the annealing furnace is kept at the Tg temperature of the chalcogenide glass material for 3-5 hours; after the holding period, the temperature is reduced to room temperature at a rate of 5-10℃ / h.

Images