CN-116441582-B - Clamp for high-precision milling of cam curve zoom lens cone

CN116441582BCN 116441582 BCN116441582 BCN 116441582BCN-116441582-B

Abstract

The invention belongs to the field of processing tools of cam curve lens barrels, and discloses a clamp for high-precision milling of cam curve zoom lens barrels, which comprises a zoom lens barrel body, a mandrel, a centering ring and a tool base, wherein four groups of guide grooves with angles are arranged on the bottom surface of the mandrel on the outer circle of the mandrel and are used for filling molten wax; the outer circle of the mandrel and the end of the tool base face the zoom lens barrel body, so that the rigidity and the machining precision of the zoom lens barrel body during machining are guaranteed, and the starting position of cam curve milling during the repeated clamping is guaranteed through the design of pin holes in the zoom lens barrel body. The invention has simple and compact structure and strong operability, and solves the problem of low rigidity of the zoom lens cone cam curve during milling.

Inventors

TIAN YAO
ZHAO JIN
ZENG XINGCHANG
MAI YUYING
SUN PENGCHENG
WANG ZHIBIN
ZHANG ZHENG
SU JUN
WANG ZHANGLI
ZHANG XIANG
WANG FUCHAO

Assignees

西安应用光学研究所

Dates

Publication Date: 20260505
Application Date: 20230317

Claims (6)

1. A clamp for high-precision milling of a cam curve zoom lens barrel is characterized by comprising a mandrel (2), a centering ring (3) and a tool base (4), wherein the centering ring (3) is arranged in a counter bore of the tool base (4), one end part of the mandrel (2) is arranged in a hole of the centering ring (3), an inner hole cylindrical surface interface at one end of a zoom lens barrel body (1) is matched with an outer cylindrical surface in the middle of the mandrel (2), one end surface of the zoom lens barrel body (1) and the end surface of the tool base (4) are fixed through screws (8), in the fixing process, the centering ring (3) is pressed to cause the diameter of an inner hole and the outer cylindrical surface to change, the pressed aperture of the inner hole is reduced and is in contact with the outer cylindrical surface at one end of the mandrel (2), the pressed aperture of the outer cylindrical surface is increased and is matched with the counter bore of the tool base (4), a mandrel cover (5) is fixed at the other end surface of the mandrel (2) through screws (8), an annular gap is formed between the other end outer wall of the mandrel (2) and the inner wall of the other end of the zoom lens body (1), after the clamp is preheated, molten filling wax (6) in the gap, the molten state filling wax (6) is filled in the gap, after the molten state is solidified, the molten state filling wax (6) and the whole body (4) and the whole body) is inserted into the tool base (4) together with the end surface to be positioned between the end surface and the tool base (11), and the whole body and the tool lens barrel (1) and the end surface; four groups of diversion trenches (10) are arranged on the outer cylindrical surface at the other end of the mandrel (2) at intervals along the parallel axial direction, and each group of diversion trench bottoms is designed to be of a gradient structure, and the angle is 2-3 degrees; The center of the mandrel (2) is provided with a weight-reducing counter bore (7), and the mandrel cover (5) is assembled with the mandrel (2) and is covered on the opening side of the weight-reducing counter bore (7); the ratio of the inner diameter to the outer diameter of the centering ring (3) is designed to be 9/14, the wall thickness is 1.5mm, and 65Mn is selected as a material; A pin (11) is designed between one end face of the zoom lens cone body (1) and the end face of the tool base (4), and is used for determining the initial position when the curve groove (9) on the outer circle of the zoom lens cone body (1) is clamped and processed for many times.
2. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 1, wherein the radius of the annular gap between the excircle of the other end of the mandrel (2) and the zoom lens barrel body (1) is 3mm.
3. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 2 is characterized in that the flatness of two end faces of the fixture base (4) is required to be 0.01-0.02, and the perpendicularity of the assembly end face of a counter bore of the fixture base (4) and one end of the zoom lens barrel body (1) is required to be 0.01-0.02.
4. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 3, wherein the coaxiality of the middle excircle of the mandrel (2) matched with the zoom lens barrel body (1) and the excircle of one end of the mandrel (2) matched with the centering ring (3) is required to be 0.01-0.02.
5. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 4, wherein the end face mounting verticality of the central excircle of the mandrel (2) matched with the zoom lens barrel body (1) and the end excircle of the mandrel (2) matched with the centering ring (3) is required to be 0.01-0.02.
6. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 5, wherein the tolerance of the matching position of the middle outer circle of the mandrel (2) and the zoom lens barrel body (1) is H7/H6.

Description

Clamp for high-precision milling of cam curve zoom lens cone Technical Field The invention belongs to the field of machining tools of cam curve lens barrels, and particularly relates to a clamp for high-precision milling of a cam curve zoom lens barrel, which is used for a four-axis or five-axis machining center. Background The cam curve zoom lens barrel is an important part in an optical zoom system, and the cam curve zoom lens barrel is structurally characterized in that two or more curve grooves with certain angles and lengths are wound on the circumferential surface of the cylinder wall, and the forming method of the curve grooves can be realized through milling. But the structural characteristics of the zoom lens barrel enable the rigidity of the workpiece to be reduced in the milling process of the part, and the high-precision design requirement of the workpiece is difficult to ensure due to the action of cutting force. Disclosure of Invention Object of the invention The invention aims to provide the clamp for milling the cam curve zoom lens barrel with high precision, which is used for accurately positioning the lens barrel body and clamping the lens barrel body with low stress, and meanwhile, the rigidity of the zoom lens barrel body in the cam curve milling process is increased, and the processing precision of the zoom lens barrel body is improved. (II) technical scheme The invention provides a clamp for high-precision milling of a cam curve zoom lens barrel, which comprises a mandrel 2, a centering ring 3 and a tool base 4, wherein the centering ring 3 is arranged in a counter bore of the tool base 4, one end of the mandrel 2 is installed in a hole of the centering ring 3, an inner hole cylindrical surface interface at one end of a zoom lens barrel body 1 is matched with an outer cylindrical surface in the middle of the mandrel 2, one end face of the zoom lens barrel body 1 and one end face of the tool base 4 are fixed through screws 8, in the fixing process, the centering ring 3 is pressed to cause the diameters of the inner hole and the outer circle to change, the pressed aperture of the inner hole is reduced and is contacted with the outer circle at one end of the mandrel 2, the pressed aperture of the outer circle is increased and is matched with the counter bore of the tool base 4, a mandrel cover 5 is fixed at the other end face of the mandrel 2 through screws 8, after the clamp is preheated, molten state filling wax 6 is filled in the gap, after the molten state filling wax 6 is solidified, the zoom lens barrel body 1 and the whole body 4 is installed on a working table, and finally pins 11 are inserted between the matched end faces of the zoom lens barrel body 1 and the tool base 4 for milling positioning. (III) beneficial effects The clamp for milling the cam curve zoom lens barrel with high precision has the advantages of simple and compact structure, convenience in clamping and disassembly in the operation process of personnel, capability of reducing clamping stress, simultaneously effectively improving the rigidity of parts during milling, reducing the influence of cutting force, improving the machining precision of cam curves and realizing high-precision milling. Drawings Fig. 1 is a schematic structural diagram of a fixture for milling cam curve zoom lens barrel with high precision. FIG. 2 is a cross-sectional view of FIG. 1; fig. 3 is a schematic structural view of the zoom lens barrel body. Fig. 4 is a schematic structural diagram of a mandrel. Fig. 5 is a schematic structural view of the centering ring. In the figure, a 1-zoom lens cone body, a 2-mandrel, a 3-centering ring, a 4-tool base, a 5-mandrel cover, 6-filling wax, a 7-mandrel lightening hole, 8-screws, a 9-curve groove, a 10-guide groove and 11-pin Detailed Description To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to the accompanying drawings and examples. Referring to fig. 1 to 5, the cam curve high-precision milling fixture for the zoom lens barrel of the embodiment comprises a zoom lens barrel body 1, a mandrel 2, a centering ring 3 and a tool base 4. As shown in fig. 1, a centering ring 3 is arranged in a counter bore of a tool base 4, one end part of a mandrel 2 is arranged in a hole of the centering ring 3, an inner hole cylindrical surface interface at one end of a zoom lens barrel body 1 is matched with an outer cylindrical surface at the middle part of the mandrel 2, one end surface of the zoom lens barrel body 1 and the end surface of the tool base 4 are fixed through screws 8, in the fixing process, the diameter of an inner hole and the diameter of an outer circle change caused by the compression of the centering ring 3, the compression hole diameter of the inner hole is reduced and is contacted with the outer circle at one end of the mandrel 2, the compression hole diameter of the out