High-precision centering jig

Abstract

The utility model discloses a high-precision centering jig which comprises a main body, a centering hole is formed in the main body, the centering hole is provided with two vertical inner hole fine positioning parts, each inner hole fine positioning part is connected with a conical surface coarse positioning part, and the two conical surface coarse positioning parts are symmetrical about the central axis of the main body; the included angle between the conical surface coarse positioning part and the inner hole fine positioning part is larger than 90 degrees. According to the utility model, the centering hole is provided with the two vertical inner hole fine positioning parts, each inner hole fine positioning part is connected with the conical surface coarse positioning part, the included angle between each inner hole fine positioning part and the conical surface coarse positioning part is greater than 90 degrees, and the inner hole fine positioning parts are matched with the conical surface coarse positioning parts, so that glass raw materials to be centered can be easily extruded into the centering hole; therefore, accurate positioning can be realized, the problem of deviation in the prior art is effectively solved, and the yield of lenses is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of asphericity precision mould pressing manufacturing, in particular to a high-precision centering fixture. BACKGROUND

[0002] Asphericity processing mainly uses mould pressing hot forming, and the mould pressing hot forming processing is divided into overflow amount design and integral forming design. However, whether it is overflow amount design or integral forming design, when using the traditional centering fixture to center the glass raw material, the asphericity is easy to be not in the center of the outer diameter reference due to the glass raw material being placed askew, that is, the offset meat phenomenon is caused, and the lens is scrapped. SUMMARY

[0003] The utility model discloses a high-precision centering fixture which can solve the problem of offset meat and improve the yield of lenses.

[0004] The high-precision centering fixture comprises a main body, a centering hole is arranged in the main body, the centering hole has two vertical inner hole fine positioning portions, each inner hole fine positioning portion is connected with a conical surface coarse positioning portion, and the two conical surface coarse positioning portions are symmetrical about the central axis of the main body. The included angle between the conical surface coarse positioning portion and the inner hole fine positioning portion is greater than 90°.

[0005] Further, the two outer side walls of the main body are also provided with outer diameter fine positioning portions. In this way, the positioning precision between the main body and the mold core sleeve to be centered can be improved, and the yield of lenses is further improved.

[0006] Further, the gap between the outer diameter fine positioning portion and the mold core sleeve to be centered is within 1.5 μm. In this way, the positioning precision between the main body and the mold core sleeve to be centered can be further improved, and the yield of lenses is further improved.

[0007] Further, the shape of the conical surface coarse positioning portion is matched with the surface shape of the glass raw material to be centered. In this way, the conical surface coarse positioning portion and the glass raw material to be centered are more matched, and the glass raw material is more easily entered into the centering hole, so that the positioning precision is improved, and the yield of lenses is improved.

[0008] Further, the distance between the two inner hole fine positioning portions is within 10 μm larger than the outer diameter of the glass raw material to be centered. In this way, the positioning precision is ensured, and a certain space is left for the glass raw material, and the glass raw material with a size not completely meeting the specifications can also be applied.

[0009] Further, the main body is made of steel. In this way, the strength of the main body can be increased, the positioning precision is further improved, and the yield of lenses is improved.

[0010] Further, the main body is sleeved with a bushing. In this way, the main body and the bushing can be made of different materials, so as to ensure positioning accuracy and reduce cost.

[0011] Further, the bushing is made of steel material, and the main body is made of nylon material. In this way, the bushing can ensure strength and positioning accuracy, and the main body can reduce cost.

[0012] Further, the two outer side walls of the bushing are provided with bushing outer diameter fine positioning parts, and the gap between the bushing outer diameter fine positioning parts and the mold core sleeve to be centered is within 1.5 μm. In this way, the positioning accuracy between the bushing and the mold core sleeve to be centered can be further improved, so as to further improve the yield of the lens.

[0013] Beneficial effects: The utility model discloses a high-precision centering jig, compared with the prior art, has the following beneficial effects:

[0014] 1. The utility model discloses a centering hole is provided with two vertical inner hole fine positioning parts, and each inner hole fine positioning part is connected with a conical surface coarse positioning part with the included angle greater than 90 DEG, and the inner hole fine positioning part is matched with the conical surface coarse positioning part, so that the glass raw material to be centered can be easily squeezed into the centering hole, thereby realizing accurate positioning, solving the problem of uneven thickness in the prior art, and improving the yield of the lens.

[0015] 2. The utility model discloses an outer diameter fine positioning part is arranged on the two outer side walls of the main body, so that the positioning accuracy between the main body and the mold core sleeve to be centered can be effectively improved, and the yield of the lens is improved.

[0016] 3. The utility model discloses a bushing is arranged on the main body, so that the main body and the bushing can be made of different materials, so as to ensure positioning accuracy and reduce cost. DRAWINGS

[0017] Figure 1 It is the structure schematic view before centering of the first embodiment in the specific embodiment of the utility model.

[0018] Figure 2 It is the structure schematic view after centering of the first embodiment in the specific embodiment of the utility model.

[0019] Figure 3 It is the structure schematic view before centering of the second embodiment in the specific embodiment of the utility model.

[0020] Figure 4 It is the structure schematic view after centering of the second embodiment in the specific embodiment of the utility model. SPECIFIC EMBODIMENT

[0021] The embodiment discloses a high-precision centering jig for centering a glass raw material 4. In a first embodiment, as shown in Figure 1 Fig. 1, a centering front mold core sleeve 3 and a lower mold core 6 have been installed, and the glass raw material 4 is placed in a recessed area on top of the lower mold core 6. The glass raw material 4 needs to be centered by the centering jig.

[0022] In the first embodiment, as shown in Figure 1 Fig. 1, the centering jig comprises a main body 1 made of steel, and the main body 1 is provided with a centering hole 2 having two vertical inner hole fine positioning portions 21. The two inner hole fine positioning portions 21 are parallel to each other and have shapes matching those of the two side walls of the glass raw material 4 to be centered. The distance between the two inner hole fine positioning portions 21 is within 10 μm larger than the outer diameter of the glass raw material 4 to be centered. Each inner hole fine positioning portion 21 is connected to a conical coarse positioning portion 22, and the two conical coarse positioning portions 22 are symmetrical about the central axis of the main body 1. As shown in Figure 1 Fig. 1, the included angle between the conical coarse positioning portion 22 and the inner hole fine positioning portion 21 is greater than 90°, and the shape of the conical coarse positioning portion 22 matches the surface shape of the glass raw material 4 to be centered. The two outer side walls of the main body 1 are further provided with outer diameter fine positioning portions 23, and the gap between the outer diameter fine positioning portions 23 and the mold core sleeve 3 to be centered is within 1.5 μm.

[0023] Figure 2 Fig. 2 is a structure schematic view after centering. As shown in Fig. 2, through the cooperation of the inner hole fine positioning portion 21 and the conical coarse positioning portion 22 and the cooperation of the outer diameter fine positioning portion 23 and the mold core sleeve 3, the glass raw material 4 can be accurately extruded into the centering hole 2, thereby realizing accurate positioning and effectively solving the problem of uneven thickness in the prior art and improving the yield of lenses.

[0024] The centering jig of the embodiment can also have a second embodiment, as shown in Figure 3 Fig. 3, a bushing 5 is provided on the main body 1, the bushing 5 is made of steel, and the main body 1 is made of nylon. In this way, the bushing 5 can ensure the strength and the positioning accuracy, and the main body 1 can reduce the cost. The two outer side walls of the bushing 5 are provided with bushing outer diameter fine positioning portions 24, and the gap between the bushing outer diameter fine positioning portions 24 and the mold core sleeve 3 to be centered is within 1.5 μm.

[0025] Figure 4 Fig. 4 is a structure schematic view after centering. As shown in Fig. 4, through the cooperation of the inner hole fine positioning portion 21 and the conical coarse positioning portion 22 and the cooperation of the bushing outer diameter fine positioning portion 24 and the mold core sleeve 3, the glass raw material 4 can be accurately extruded into the centering hole 2, thereby realizing accurate positioning and effectively solving the problem of uneven thickness in the prior art and improving the yield of lenses.

[0026] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be encompassed in the protection scope of the present application.

Claims

1. A high-precision centering fixture, characterized by: The invention comprises a main body (1), wherein a centering hole (2) is provided in the main body (1), and the centering hole (2) has two vertical inner hole fine positioning parts (21), each inner hole fine positioning part (21) is connected to a conical surface rough positioning part (22), and the two conical surface rough positioning parts (22) are symmetrical about the central axis of the main body (1); and the angle between the conical surface rough positioning part (22) and the inner hole fine positioning part (21) is greater than 90°.

2. The high-precision centering jig according to claim 1, characterized in that: The two outer side walls of the main body (1) are also provided with outer diameter precision positioning portions (23).

3. The high-precision centering jig according to claim 2, characterized in that: The gap between the outer diameter precision positioning portion (23) and the mold core sleeve (3) to be centered is within 1.5 μm.

4. The high-precision centering jig according to claim 1, characterized in that: The shape of the conical surface rough positioning portion (22) is adapted to the surface shape of the glass raw material (4) to be centered.

5. The high-precision centering jig according to claim 1, characterized in that: The distance between the two inner hole precision positioning parts (21) is within 10 μm greater than the outer diameter of the glass raw material (4) to be centered.

6. The high-precision centering jig according to claim 1, characterized in that: The main body (1) is made of steel.

7. The high-precision centering jig according to claim 1, characterized in that: The main body (1) is provided with a bushing (5) on its outer shell.

8. The high-precision centering jig according to claim 7, characterized in that: The bushing (5) is made of steel, and the main body (1) is made of nylon.

9. The high-precision centering jig according to claim 7, characterized in that: Both outer side walls of the bushing (5) are provided with bushing outer diameter precision positioning portions (24), and the gap between the bushing outer diameter precision positioning portions (24) and the mold core sleeve (3) to be centered is within 1.5 μm.

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