Germanium single crystal jacket round mold and germanium single crystal jacket round system

Abstract

A germanium single crystal rounding mold and a germanium single crystal rounding system are provided. The germanium single crystal rounding mold comprises a liquid nitrogen tank and a fixing clamp. The fixing clamp is arranged in the liquid nitrogen tank, and comprises a first plate, a second plate, a third plate, a fourth plate, a bottom plate, a graphite plate, a first clamping plate and a second clamping plate. The first plate, the second plate, the third plate, the fourth plate and the bottom plate surround a receiving space. The bottom plate is detachably fixed in the liquid nitrogen tank. The graphite plate is placed on the bottom plate in physical contact and supports the bottom surface of the germanium single crystal. The first clamping plate and the first plate are used to linearly contact and clamp the germanium single crystal from opposite sides. The second clamping plate and the third plate are used to linearly contact and clamp the germanium single crystal from the other opposite sides. The liquid nitrogen tank is detachably fixed on a workbench, contains liquid nitrogen and allows the liquid nitrogen to enter the receiving space to soak the germanium single crystal.

Description

Technical Field

[0001] This disclosure relates to the field of germanium single crystals, and more specifically to a germanium single crystal die and a germanium single crystal die system. Background Technology

[0002] Germanium single crystals need to be processed into corresponding sizes according to customer requirements, requiring large-size single crystal segments to be processed into smaller-size single crystal segments. In order to reduce the waste of germanium single crystals, a single crystal segment with a diameter of more than 0.5mm larger than the requirement is first cut out on the large-size germanium single crystal segment using a rounding tool, and then rounding is performed.

[0003] Existing cylindrical bonding processes, such as those disclosed in Chinese patent document CN111873200A, involve gluing the bottom of a germanium single crystal to a graphite plate. Due to the brittleness of germanium and the stress generated by the glue, chipping occurs at both the top and bottom of the germanium single crystal during bonding, with the bottom chipping being particularly severe. Furthermore, while the glue is removed by boiling in water after bonding, it is difficult to remove completely and is time-consuming. Moreover, relying solely on glue to bond the germanium single crystal from the bottom is detrimental to the stability of the germanium single crystal supported on the graphite plate, and negatively impacts the dimensional accuracy of the resulting cylinder. Utility Model Content

[0004] In view of the problems existing in the background art, one object of this disclosure is to provide a germanium single crystal die and a germanium single crystal die system, which can greatly reduce or even eliminate the risk of chipping at the top and bottom of the germanium single crystal during die forming due to the room temperature brittleness of germanium single crystal.

[0005] Another objective of this disclosure is to provide a germanium single crystal die and a germanium single crystal die system that can eliminate the need for adhesive and effectively reduce the risk of chipping at the bottom of the germanium single crystal during die forming.

[0006] Another object of this disclosure is to provide a germanium single crystal die and a germanium single crystal die system that can eliminate the need for adhesive and ensure the cleanliness of the graphite plate surface during repeated use.

[0007] Another objective of this disclosure is to provide a germanium single crystal die and a germanium single crystal die system, which can enhance the stability of the germanium single crystal supported on the graphite plate and improve the dimensional accuracy of the cylinder produced after the germanium single crystal is die-cast.

[0008] A germanium single crystal die is provided, comprising a liquid nitrogen bath and a fixing fixture. The fixing fixture is used to mount the die into the liquid nitrogen bath and includes a first plate, a second plate, a third plate, a fourth plate, a base plate, a graphite plate, a first clamping plate, and a second clamping plate. The first plate, second plate, third plate, fourth plate, and base plate form a receiving space that is closed at the bottom and all four sides and open upwards. The base plate is used to detachably fix the fixing fixture into the liquid nitrogen bath. The graphite plate is physically placed on the base plate to support the bottom surface of the germanium single crystal to be mounted. The graphite plate can cover the bottom surface of the germanium single crystal to be mounted at any position on the base plate. The first clamping plate is disposed on the third plate and... Between the fourth plates, the second clamping plate is disposed on the fourth plate; the first clamping plate surface of the first clamping plate and the first plate surface of the first plate are used to make line contact with and clamp the germanium single crystal from opposite sides of the contact line extending in the vertical direction; the end face of the second clamping plate and the third plate surface of the third plate are used to make line contact with and clamp the germanium single crystal from the other opposite sides of the contact line extending in the vertical direction; the liquid nitrogen tank is used to be physically and detachably fixed on the worktable of the rounding machine, to hold liquid nitrogen and to allow the liquid nitrogen in the liquid nitrogen tank to enter the receiving space of the fixed fixture to soak the germanium single crystal in the receiving space.

[0009] A germanium single crystal doubling system includes a doubling machine, which includes a doubling cutter and a worktable. The germanium single crystal doubling system also includes the aforementioned germanium single crystal doubling mold.

[0010] The beneficial effects of this disclosure are as follows.

[0011] In the germanium single crystal die and germanium single crystal die system according to this disclosure, the germanium single crystal in the containment space is immersed in liquid nitrogen in a liquid nitrogen bath, so that the germanium single crystal is in a low temperature state (whether it is the part immersed in liquid nitrogen or the part exposed in liquid nitrogen (the part exposed in liquid nitrogen is also in a low temperature state due to heat conduction)). Compared with germanium single crystal at room temperature, germanium single crystal in a low temperature state has increased plasticity, thereby greatly reducing or even eliminating the risk of edge chipping at the top and bottom of the germanium single crystal due to the room temperature brittleness of germanium single crystal when die-casting germanium single crystal at room temperature.

[0012] In the germanium single crystal die and germanium single crystal die system according to the present disclosure, the graphite plate is only physically placed on the base plate to support the bottom surface of the germanium single crystal to be die-cast, without the glue bonding and fixing as in the prior art. In this way, there is no stress problem caused by glue fixing between the bottom surface of the germanium single crystal and the graphite plate. There is only contact between the bottom surface of the germanium single crystal and the graphite plate without glue restriction. The contact stress is smoothly released through the graphite plate, thereby effectively reducing the risk of edge chipping at the bottom of the die-cast germanium single crystal.

[0013] In the germanium single crystal die and germanium single crystal die system according to the present disclosure, the graphite plate is simply placed on the base plate in physical contact to support the bottom surface of the germanium single crystal to be die-cast, without the glue bonding and fixing as in the prior art. This eliminates the process of glue bonding and removal and the time spent on it, ensuring the cleanliness of the graphite plate surface when reused.

[0014] In the germanium single crystal rounding mold and germanium single crystal rounding system according to the present disclosure, the first clamping plate surface of the first clamping plate and the first plate surface of the first plate are used to make line contact and clamp the germanium single crystal from opposite sides in the vertical direction along contact lines. The end face of the second clamping plate and the third plate surface of the third plate are used to make line contact and clamp the germanium single crystal from the other opposite sides in the vertical direction along contact lines. Thus, the germanium single crystal supported on the graphite plate is linearly fixed at four positions in the circumferential direction. Compared with the prior art, which only uses glue to fix the germanium single crystal from the bottom, the stability of the germanium single crystal supported on the graphite plate is enhanced, which is beneficial to improving the dimensional accuracy of the cylinder after the germanium single crystal is rounded. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a germanium single crystal nested system according to the present disclosure.

[0016] Figure 2 This is a cross-sectional perspective view of the rounding cutter of the rounding machine in the germanium single crystal rounding system.

[0017] Figure 3 This is an exploded perspective view of the germanium single crystal die in a germanium single crystal die system, in which the germanium single crystal is shown.

[0018] Figure 4 This is a structural diagram of the first, second, third, and fourth plates, as well as the base plate, of the germanium single crystal die.

[0019] Figure 5 This is a schematic diagram of the bottom wall of the liquid nitrogen tank for a germanium single crystal die.

[0020] Figure 6 yes Figure 1 A top view of the germanium single crystal die for the germanium single crystal die system.

[0021] The reference numerals in the attached figures are explained below.

[0022] 1000 Germanium single crystal circular system 24 fourth plate

[0023] 100 sets of circular knitting machine base plates

[0024] 101 sets of circular cutting tools and 26 graphite plates

[0025] 101a Lower Ring 27 First Clamping Plate

[0026] 101b Through Hole 271 First Clamping Plate Surface 102 Workbench 272 First Clamping Plate Bottom Surface 102a Mounting hole 273 First threaded hole

[0027] 200 Germanium single crystal round mold 28 second clamping plate

[0028] 1 Liquid nitrogen tank 281 end face

[0029] 11 Bottom wall 282 Second clamping plate bottom surface 111 pin 283 second threaded hole

[0030] 112 Recessed S-shaped Reception Space

[0031] 2. Fixture C1 First Channel 21 First plate C2 Second channel

[0032] 211 First plate surface B1 First cap bolt 22 Second plate B2 Second cap bolt 23 Third Plate 300 Germanium Single Crystal

[0033] 231 Third board surface Detailed Implementation

[0034] The accompanying drawings illustrate embodiments of this disclosure, and it will be understood that the disclosed embodiments are merely examples of this disclosure, which can be implemented in various forms. Therefore, the specific details disclosed herein should not be construed as limiting, but are intended only as the basis for the claims and as an illustrative basis to teach those skilled in the art how to implement this disclosure in various ways.

[0035] In this disclosure, unless otherwise stated, the terms “first,” “second,” “third,” “fourth,” etc., are used for illustrative and component identification purposes only and should not be construed as indicating relative importance or interrelationship.

[0036] [Germanium Single Crystal Round Mold]

[0037] Reference Figures 1 to 6 The germanium single crystal die 200 disclosed herein includes a liquid nitrogen tank 1 and a fixing fixture 2.

[0038] The fixing clamp 2 is used to be installed inside the liquid nitrogen tank 1. The fixing clamp 2 includes a first plate 21, a second plate 22, a third plate 23, a fourth plate 24, a base plate 25, a graphite plate 26, a first clamping plate 27, and a second clamping plate 28. The first plate 21, the second plate 22, the third plate 23, the fourth plate 24, and the base plate 25 form a receiving space S that is closed at the bottom and all four sides and open upwards. The base plate 25 is used to fix the fixing clamp 2 detachably inside the liquid nitrogen tank 1. The graphite plate 26 is used to physically contact the base plate 25 to support the bottom surface of the germanium single crystal 300 to be fitted. The graphite plate 26 can cover the bottom surface of the germanium single crystal 300 to be fitted at any position on the base plate 25. The first clamping plate 27 is located between the third plate 23 and the fourth plate 24, and the second clamping plate 28 is located on the fourth plate 24. The first clamping plate surface 271 of the first clamping plate 27 and the first plate surface 211 of the first plate 21 are used to make line contact with and clamp the germanium single crystal 300 from opposite sides of the contact line extending in the vertical direction. The end face 281 of the second clamping plate 28 and the third plate surface 231 of the third plate 23 are used to make line contact with and clamp the germanium single crystal 300 from the other opposite sides of the contact line extending in the vertical direction. The liquid nitrogen tank 1 is physically and detachably fixed on the worktable 102 of the rounding machine 100, contains liquid nitrogen, and allows the liquid nitrogen in the liquid nitrogen tank 1 to enter the receiving space S of the fixed fixture 2 to immerse the germanium single crystal 300 in the receiving space S.

[0039] In the germanium single crystal die 200 according to this disclosure, the germanium single crystal 300 in the containment space S is immersed in liquid nitrogen in the liquid nitrogen tank 1, so that the germanium single crystal 300 is in a low temperature state (whether it is the part immersed in liquid nitrogen or the part exposed in liquid nitrogen (the part exposed in liquid nitrogen is also in a low temperature state due to heat conduction)). Compared with the germanium single crystal at room temperature, the germanium single crystal 300 in the low temperature state has increased plasticity, thereby greatly reducing or even eliminating the risk of chipping at the top and bottom of the germanium single crystal 300 when die 300 is die 300 at room temperature due to the room temperature brittleness of the germanium single crystal 300.

[0040] In the germanium single crystal die 200 according to this disclosure, the graphite plate 26 is placed on the base plate 25 in physical contact to support the bottom surface of the germanium single crystal 300 to be die-cast, without the glue bonding and fixing as in the prior art. In this way, there is no stress problem caused by glue fixing between the bottom surface of the germanium single crystal 300 and the graphite plate 26. There is only contact between the bottom surface of the germanium single crystal 300 and the graphite plate 26 without glue restriction. The contact stress is smoothly released through the graphite plate 26, thereby effectively reducing the risk of chipping at the bottom of the die-cast germanium single crystal 300.

[0041] In the germanium single crystal die 200 according to this disclosure, the graphite plate 26 is placed on the base plate 25 in physical contact to support the bottom surface of the germanium single crystal 300 to be die-cast, without the glue bonding and fixing as in the prior art. This eliminates the process of glue bonding and removal and the time spent, ensuring the cleanliness of the surface of the graphite plate 26 when reused.

[0042] In the germanium single crystal die 200 according to this disclosure, the first clamping plate surface 271 of the first clamping plate 27 and the first plate surface 211 of the first plate 21 are used to make line contact and clamp the germanium single crystal 300 from opposite sides of the vertically extending contact lines. The end face 281 of the second clamping plate 28 and the third plate surface 231 of the third plate 23 are used to make line contact and clamp the germanium single crystal 300 from the other opposite sides of the vertically extending contact lines. Thus, the germanium single crystal 300, which is clamped and fixed on the graphite plate 26, is linearly fixed at four positions in the circumferential direction. Compared with the prior art, which only uses glue to fix the germanium single crystal from the bottom, this method enhances the stability of the germanium single crystal 300 supported on the graphite plate 26 and helps to improve the dimensional accuracy of the cylinder after the germanium single crystal 300 is die-cast.

[0043] like Figure 1 and Figure 3 As shown, in one example, the bottom wall 11 of the liquid nitrogen tank 1 has multiple pins 111 on its bottom side. These pins 111 are used for interference fit with multiple mounting holes 102a on the worktable 102 of the rounding machine 100. This allows for physical detachable fixing to the worktable 102 of the rounding machine 100. However, this is not the only possibility. In an alternative example not shown, the bottom wall 11 of the liquid nitrogen tank 1 can be convex-concave with the worktable 102 of the rounding machine 100 to achieve detachable fixing. The material of the bottom wall 11 of the liquid nitrogen tank 1 should meet the requirements of strength at the low temperature of liquid nitrogen and the stability of the fit between the bottom wall 11 and the worktable 102 of the rounding machine 100. For example, the liquid nitrogen tank 1 can be made entirely of stainless steel.

[0044] like Figure 1 , Figure 3 and Figure 5 As shown, in one example, the bottom wall 11 of the liquid nitrogen tank 1 has a recess 112 on its top side. The recess 112 is used to accommodate the bottom of the base plate 25 of the fixing clamp 2 and the bottoms of the first plate 21, the second plate 22, the third plate 23, and the fourth plate 24, and is interference-fitted with the bottoms of the first plate 21, the second plate 22, the third plate 23, and the fourth plate 24. Thus, the base plate 25 is used to detachably fix the fixing clamp 2 inside the liquid nitrogen tank 1.

[0045] like Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, the first plate 21 and the second plate 22 are parallel to each other and spaced apart, the third plate 23 and the fourth plate 24 are parallel to each other and spaced apart, the third plate 23 is perpendicularly connected to the first plate 21 and the second plate 22, and the fourth plate 24 is perpendicularly connected to the first plate 21 and the second plate 22. The first clamping plate 27 and the second clamping plate 28 are parallel to the first plate 21 and the second plate 22. The end face 281 of the second clamping plate 28 is used for line contact and clamping of the germanium single crystal 300 at the center position between the first plate 21 and the first clamping plate 27. Thus, as Figure 6 As shown, the contact positions of the first plate surface 211 of the first plate 21 with the germanium single crystal 300, the contact positions of the third plate surface 231 of the third plate 23 with the germanium single crystal 300, the contact positions of the first clamping plate surface 271 of the first clamping plate 27 with the germanium single crystal 300, and the contact positions of the end face 281 of the second clamping plate 28 with the germanium single crystal 300 equally divide the circumference of the germanium single crystal 300, which is beneficial to enhancing the stability of the germanium single crystal 300 supported on the graphite plate 26.

[0046] like Figure 1 As shown, in one example, the height of the first plate 21, the second plate 22, the third plate 23, and the fourth plate 24 within the liquid nitrogen tank 1 is lower than the top surface of the liquid nitrogen tank 1. Thus, the liquid nitrogen tank 1 can provide protection for the top of the fixing clamp 2 and the top of the germanium single crystal 300. Furthermore, the amount of liquid nitrogen contained in the liquid nitrogen tank 1 can be increased so that the liquid level within the liquid nitrogen tank 1 is higher than the first plate 21, the second plate 22, the third plate 23, and the fourth plate 24 within the liquid nitrogen tank 1. The materials of the first plate 21, the second plate 22, the third plate 23, and the fourth plate 24 need to meet the requirements of strength at the low temperature of liquid nitrogen and the clamping stability of the first plate 21 and the third plate 23 for the germanium single crystal 300. For example, the materials of the first plate 21, the second plate 22, the third plate 23, and the fourth plate 24 can be stainless steel plates.

[0047] The number of graphite plates 26 can be single or multiple stacked together, depending on the need.

[0048] like Figure 1 As shown, in one example, the bottom surface 272 of the first clamping plate 27 is used to press against the graphite plate 26; and / or the bottom surface 282 of the second clamping plate 28 is used to press against the graphite plate 26. This is beneficial to enhance the stability of the germanium single crystal 300 supported on the graphite plate 26 and the stability of the graphite plate 26 on the base plate 25.

[0049] like Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, in one example, the first clamping plate 27 has first threaded holes 273 on each side opposite to the third plate 23 and the fourth plate 24. The third plate 23 and the fourth plate 24 each have a first channel C1 extending in the direction opposite to the first plate 21 and the second plate 22 and penetrating in the direction opposite to the third plate 23 and the fourth plate 24. The fixing clamp 2 also includes multiple first cap bolts B1; the multiple first cap bolts B1 pass through the corresponding first channel C1 and are threaded into the corresponding first threaded holes 273, so that the first clamping plate 27 is fixed on the third plate 23 and the fourth plate 24, and the first clamping plate surface 271 of the first clamping plate 27 contacts and clamps the germanium single crystal 300 from the side of the germanium single crystal 300 opposite to the first plate surface 211 of the first plate 21 on a contact line extending in the vertical direction. This achieves the movable adjustment mode of the first clamping plate 27. Furthermore, the first channel C1 also facilitates the inflow of liquid nitrogen into the containment space S. The number of the first threaded hole 273 and the first cap bolt B1 can be determined based on the actual stability of the first clamping plate 27.

[0050] Similarly, as Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, in one example, the second clamping plate 28 has a second threaded hole 283 on the side opposite to the fourth plate 24. The fourth plate 24 has a second channel C2 extending in the direction opposite to the first plate 21 and the second plate 22 and penetrating in the direction opposite to the third plate 23 and the fourth plate 24. The fixing clamp 2 also includes a second cap bolt B2; the second cap bolt B2 passes through the second channel C2 and is threaded into the second threaded hole 283, so that the second clamping plate 28 is fixed on the fourth plate 24 and the end face 281 of the first clamping plate 27 makes line contact with and clamps the germanium single crystal 300 from the side of the germanium single crystal 300 opposite to the third plate surface 231 of the third plate 23 on a contact line extending in the vertical direction. Thus, the movable adjustment mode of the second clamping plate 28 is realized. Furthermore, the contact positions of the end face 281 of the first clamping plate 27 and the germanium single crystal 300, the center of the germanium single crystal 300, and the contact positions of the third plate surface 231 of the third plate 23 and the germanium single crystal 300 are aligned on the same straight line, improving the stability of the contact lines extending vertically from opposite sides of the germanium single crystal 300 and clamping the germanium single crystal 300. Additionally, the second channel C2 facilitates the inflow of liquid nitrogen into the containment space S. The number of second threaded holes 283 and second capped bolts B2 can be determined based on the actual stability of the second clamping plate 28's fixation.

[0051] like Figure 1 , Figure 3 and Figure 4As shown, the second channel C2 is connected to the first channel C1 and lies in a straight line. This simplifies the design of the second channel C2 and the first channel C1.

[0052] [Germanium Single Crystal Circular System]

[0053] Reference Figures 1 to 6 The germanium single crystal rounding system 1000 disclosed herein includes a rounding machine 100, which includes a rounding cutter 101 and a worktable 102. The germanium single crystal rounding system 1000 also includes the aforementioned germanium single crystal rounding mold 200.

[0054] The detailed features, effects, and operation of the germanium single crystal circular mold 200 can be found above and will not be repeated here.

[0055] Reference Figure 1 and Figure 2 In one example, the circular cutting tool 101 has an annular lower portion 101a for circularly circling germanium single crystals 300. The annular lower portion 101a has a plurality of radially penetrating through holes 101b for discharging debris and liquid nitrogen generated during the circular circling of the germanium single crystals 300. For example, the annular lower portion 101a is made of abrasive grains or has its inner and outer surfaces coated with diamond grit.

[0056] During operation, the germanium single crystal 300 in the fixed fixture 2 is immersed in liquid nitrogen for 5-15 minutes before being rounded.

[0057] When performing circular cutting on the annular lower part 101a of the circular cutting tool 101, the circular cutting speed is slow at the top and bottom 5-10mm of the germanium single crystal 300, and fast in the middle. For example, the initial speed is 0.5-1.5rpm, the depth is 5-10mm, the intermediate speed is 4-5rpm, the depth is 5-10mm remaining in the germanium single crystal 300, and the final speed is adjusted to 0.5-1.5rpm, the depth is the remaining 5-10mm. The annular lower part 101a of the circular cutting tool 101 can finally partially enter the graphite plate 26.

[0058] Several exemplary embodiments have been described in detail above, but this document is not intended to limit itself to the explicitly disclosed combinations. Therefore, unless otherwise stated, the various features disclosed herein can be combined to form several other combinations, which are not shown for simplicity.

Claims

1. A germanium single crystal die for forming a circle, characterized in that, The germanium single crystal die includes a liquid nitrogen tank (1) and a fixing fixture (2); The fixing clamp (2) is used to be installed in the liquid nitrogen tank (1). The fixing clamp (2) includes a first plate (21), a second plate (22), a third plate (23), a fourth plate (24), a base plate (25), a graphite plate (26), a first clamping plate (27), and a second clamping plate (28). The first plate (21), the second plate (22), the third plate (23), the fourth plate (24) and the bottom plate (25) form a receiving space (S) that is closed at the bottom and around the sides and open to the top; The base plate (25) is used to fix the clamp (2) detachably inside the liquid nitrogen tank (1); The graphite plate (26) is used to physically contact the base plate (25) to support the bottom surface of the germanium single crystal (300) to be enclosed in a circle. The graphite plate (26) can cover the bottom surface of the germanium single crystal (300) to be enclosed in a circle at any position on the base plate (25). The first clamping plate (27) is located between the third plate (23) and the fourth plate (24), and the second clamping plate (28) is located on the fourth plate (24); The first clamping plate surface (271) of the first clamping plate (27) and the first plate surface (211) of the first plate (21) are used to make line contact with and clamp the germanium single crystal (300) from opposite sides of the contact line extending in the vertical direction. The end face (281) of the second clamping plate (28) and the third plate surface (231) of the third plate (23) are used to make line contact with and clamp the germanium single crystal (300) from the other opposite sides of the contact line extending in the vertical direction. The liquid nitrogen tank (1) is physically and detachably fixed on the worktable (102) of the rounding machine (100), holds liquid nitrogen and allows the liquid nitrogen in the liquid nitrogen tank (1) to enter the containment space (S) of the fixed fixture (2) to soak the germanium single crystal (300) in the containment space (S).

2. The germanium single crystal die according to claim 1, characterized in that, The bottom wall (11) of the liquid nitrogen tank (1) is provided with multiple pins (111) on the bottom side. The multiple pins (111) are used to make an interference fit with multiple mounting holes (102a) on the worktable (102) of the rounding machine (100).

3. The germanium single crystal die according to claim 1, characterized in that, The bottom wall (11) of the liquid nitrogen tank (1) has a recess (112) on the top side. The recess (112) is used to accommodate the bottom of the base plate (25) of the fixing clamp (2) and the bottom of the first plate (21), the second plate (22), the third plate (23) and the fourth plate (24) and is interference-fitted with the bottom of the first plate (21), the second plate (22), the third plate (23) and the fourth plate (24).

4. The germanium single crystal die according to claim 1, characterized in that, The first plate (21) and the second plate (22) are parallel to each other and spaced apart. The third plate (23) and the fourth plate (24) are parallel to each other and spaced apart. The third plate (23) is perpendicularly connected to the first plate (21) and the second plate (22). The fourth plate (24) is perpendicularly connected to the first plate (21) and the second plate (22). The first clamping plate (27) and the second clamping plate (28) are parallel to the first plate (21) and the second plate (22). The end face (281) of the second clamping plate (28) is used to make line contact with and clamp the germanium single crystal (300) at the center position between the first plate (21) and the first clamping plate (27).

5. The germanium single crystal die according to claim 1, characterized in that, The height of the first plate (21), the second plate (22), the third plate (23), and the fourth plate (24) inside the liquid nitrogen tank (1) is lower than the top surface of the liquid nitrogen tank (1).

6. The germanium single crystal die according to claim 1, characterized in that, The bottom surface (272) of the first clamping plate (27) is used to press against the graphite plate (26); and / or The bottom surface (282) of the second clamping plate (28) is used to press on the graphite plate (26).

7. The germanium single crystal die according to claim 1, characterized in that, The first clamping plate (27) has a first threaded hole (273) on each of its two sides opposite to the third plate (23) and the fourth plate (24). The third plate (23) and the fourth plate (24) are each provided with a first channel (C1) extending in the opposite direction to the first plate (21) and the second plate (22) and penetrating in the opposite direction to the third plate (23) and the fourth plate (24). The fixing clamp (2) also includes a plurality of first capped bolts (B1); Multiple first capped bolts (B1) pass through the corresponding first slots (C1) and are threaded into the corresponding first threaded holes (273) so that the first clamping plate (27) is fixed on the third plate (23) and the fourth plate (24) and the first clamping plate surface (271) of the first clamping plate (27) makes line contact with and clamps the germanium single crystal (300) on the contact line extending in the vertical direction from the side opposite to the first plate surface (211) of the first plate (21).

8. The germanium single crystal die according to claim 7, characterized in that, The second clamping plate (28) has a second threaded hole (283) on the side opposite to the fourth plate (24). The fourth plate (24) is provided with a second channel (C2) extending in the opposite direction to the first plate (21) and the second plate (22) and penetrating in the opposite direction to the third plate (23) and the fourth plate (24). The fixing clamp (2) also includes a second cap bolt (B2); The second capped bolt (B2) passes through the second channel (C2) and is threaded into the second threaded hole (283) so that the second clamping plate (28) is fixed on the fourth plate (24) and the end face (281) of the first clamping plate (27) makes line contact with and clamps the germanium single crystal (300) on the contact line extending in the vertical direction from the side opposite to the third plate surface (231) of the third plate (23).

9. The germanium single crystal die according to claim 8, characterized in that, The second channel (C2) is connected to the first channel (C1) and is on a straight line.

10. A germanium single crystal rounding system, comprising a rounding machine (100), the rounding machine (100) comprising a rounding cutter (101) and a worktable (102), characterized in that, The germanium single crystal die system (1000) also includes the germanium single crystal die (200) as described in any one of claims 1-9.

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