CN116441582A - A fixture for high-precision milling of cam curve zoom lens barrel - Google Patents

Abstract

The invention belongs to the field of processing tools for cam curve lens barrels, and discloses a jig for high-precision milling of cam curve zoom lens barrels, including a zoom lens barrel body, a mandrel, a centering ring, a tooling base, and a design on the outer circle of the mandrel. There are four groups of diversion grooves with angles on the bottom surface, which are used for filling molten wax. The centering ring in the present invention is placed in the tooling base. The tooling base is matched; the zoom lens barrel body is positioned through the outer circle of the mandrel and the tooling base end to ensure the rigidity and machining accuracy of the zoom lens barrel body during processing; the design of the pin hole on the zoom lens barrel body ensures the separation Definition of the starting position for cam curve milling in the first clamping. The invention has simple and compact structure and strong operability; it solves the difficult problem of low rigidity when milling the cam curve of the zoom lens barrel.

Description

A fixture for high-precision milling of cam curve zoom lens barrel

technical field

The invention belongs to the field of processing tools for cam curve lens barrels, and in particular relates to a fixture used for high-precision milling of cam curve zoom lens barrels by a four-axis or five-axis machining center.

Background technique

The cam curve zoom lens barrel is an important part of the optical zoom system. Its structure is that two or more curved grooves with a certain angle and length are wound on the circumferential surface of the cylinder wall. The forming method of the curved grooves can be realized by milling. . However, the structural characteristics of the zoom lens barrel reduce the rigidity of the workpiece during the milling process, coupled with the cutting force, it is difficult to ensure the high-precision design requirements of the workpiece.

Contents of the invention

(1) Purpose of the invention

The purpose of the present invention is to provide a jig for high-precision milling of the cam curve zoom lens barrel, which can precisely position the lens barrel body and perform low-stress clamping, and at the same time increase the rigidity of the zoom lens barrel body during the cam curve milling process, improving The processing accuracy of the zoom lens barrel body.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a jig for high-precision milling of cam curve zoom lens barrel, which includes: mandrel 2, centering ring 3 and tooling base 4; centering ring 3 is placed in tooling base 4 counterbore Among them, one end of the mandrel 2 is installed in the hole 3 of the centering ring, the cylindrical interface of one end of the zoom lens barrel body 1 is matched with the outer cylindrical surface of the middle part of the mandrel 2, and the end surface of the zoom lens barrel body 1 is connected with the end surface of the tooling base 4 It is fixed by screws 8. During the fixing process, the diameter of the inner hole and the outer circle changes when the centering ring 3 is under pressure. Enlarged and matched with the counterbore of the tooling base 4; the mandrel cover 5 is fixed on the end face of the other end of the mandrel 2 by screws 8; an annular gap is formed between the outer wall of the other end of the mandrel 2 and the inner wall of the other end of the zoom lens barrel body 1, and the clamp is pre- After heating, fill the gap with molten filling wax 6, and after the molten filling wax 6 is solidified, install the zoom lens barrel body 1 together with the tooling base 4 on the work surface as a whole. Insert pin 11 between and carry out milling positioning.

(3) Beneficial effects

The jig for high-precision milling of the cam curve zoom lens barrel provided by the above technical solution has a simple and compact structure, and is convenient for clamping and dismounting during the operation of personnel; the device can effectively improve the milling of parts while reducing clamping stress. When the rigidity and reduce the impact of cutting force, improve the machining accuracy of the cam curve, to achieve high-precision milling.

Description of drawings

FIG. 1 is a schematic structural view of a jig for high-precision milling of a cam curve zoom lens barrel proposed by the present invention.

Fig. 2 is the sectional view of Fig. 1;

FIG. 3 is a schematic structural diagram of the zoom lens barrel body.

Fig. 4 is a schematic structural view of the mandrel.

Fig. 5 is a structural schematic diagram of the centering ring.

In the figure: 1-zoom barrel body, 2-mandrel, 3-centering ring, 4-tooling base, 5-mandrel cover, 6-filling wax, 7-mandrel weight reduction hole, 8-screw, 9 - Curve groove, 10- diversion groove, 11- pin

Detailed ways

In order to make the purpose, content and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to FIGS. 1-5 , the jig for high-precision milling of the cam curve zoom lens barrel in this embodiment includes a zoom lens barrel body 1 , a mandrel 2 , a centering ring 3 and a tooling base 4 .

As shown in Figure 1, the centering ring 3 is placed in the counterbore of the tooling base 4, one end of the mandrel 2 is installed in the hole of the centering ring 3, and the cylindrical surface interface of the end of the zoom lens barrel body 1 is connected to the middle of the mandrel 2 The outer cylindrical surface cooperates, and the end surface of the zoom lens barrel body 1 and the end surface of the tooling base 4 are fixed by screws 8. During the fixing process, the pressure of the centering ring 3 causes the diameter of the inner hole and the outer circle to change, and the diameter of the inner hole decreases under pressure. And contact with the outer circle of one end of the mandrel 2, the diameter of the outer circle under pressure increases and cooperates with the counterbore of the tooling base 4; the mandrel cover 5 is fixed on the end face of the other end of the mandrel 2 by screws 8; the outer wall of the other end of the mandrel 2 An annular gap is formed between the inner wall of the other end of the zoom lens barrel body 1. After the fixture is preheated, the molten filling wax 6 is poured into the gap. After the molten filling wax 6 solidifies, the zoom lens barrel body 1 and the tooling base 4 are integrally installed on Finally, on the working table, pins 11 are inserted between the matching end faces of the zoom lens barrel body 1 and the tooling base 4 for milling and positioning.

In this embodiment, the flatness of both ends of the tooling base 4 is required to be 0.01 to 0.02; the perpendicularity of the counterbore of the tooling base 4 to the assembly end surface of the zoom lens barrel body 1 is required to be 0.01 to 0.02; the mandrel 2 is matched with the zoom lens barrel body 1 The coaxiality of the outer circle at one end of the middle part and the mandrel 2 matched with the centering ring 3 requires 0.01 to 0.02; The outer circle of one end of the ring 3 matched with the mandrel 2 and the tooling base 4 should have a perpendicularity of 0.01-0.02. The tolerance of the matching position between the outer circle of the central part of the mandrel 2 and the zoom lens barrel body 1 is H7/h6. These technical requirements are all to ensure the positioning accuracy of the zoom lens barrel body 1 during clamping.

In this embodiment, the radius of the annular gap between the outer circle of the other end of the mandrel 2 and the zoom lens barrel body 1 is 3mm; the outer cylindrical surface of the other end of the mandrel 2 is designed with four sets of guide grooves 10 at intervals along the parallel axial direction, The bottom of each group of diversion grooves is designed as a slope structure with an angle of 2° to 3°, which fully ensures the flow and filling of the molten filling wax 6, ensures the rigidity of the workpiece during milling and the adhesion between the filling wax 6 and the mandrel 2 , to prevent the loosening of the filling wax 6 during the milling process.

In order to improve the operability and completeness of use, the center of the mandrel 2 is designed with a weight-reducing counterbore 7 to achieve the purpose of weight reduction; further, the mandrel cover 5 is assembled with the mandrel 2 to prevent the wax from being filled in the molten state during wax filling 6 Flow into the open side of the counterbore 7 to reduce the weight of the mandrel, reducing the waste of raw materials and improving work efficiency at the same time.

As shown in Figure 5, the ratio of the inner and outer diameters of the centering ring 3 is designed to be 9/14, the wall thickness is 1.5mm, and the material is 65Mn. It is placed in the counterbore of the tooling base 4, and the diameter of the inner hole decreases after axial compression , the diameter of the outer circle increases to achieve the purpose of automatic centering, and at the same time play the role of weight reduction; the inner hole of the centering ring 3 is matched with the outer circle of the mandrel 2, and the outer circle of the centering ring 3 is matched with the inner hole of the tooling base 4 Cooperating with each other, the processing accuracy of the zoom lens barrel body 1 is guaranteed.

In this embodiment, between the end surface of one end of the zoom lens barrel body 1 and the end surface of the tooling base 4, a pin 11 is designed between any two screws 8 for multiple clamping and processing of the curved groove on the outer circle of the zoom lens barrel body 1 The starting position at 9:00 is determined.

After the zoom lens barrel body 1, the mandrel 2, the centering ring 3 and the tooling base 4 are assembled, they are placed in a resistance furnace for preheating to ensure that the wax filling process is fully filled.

After the preheating process of the zoom lens barrel body 1 and the fixture is completed, the molten filling wax 6 is poured into the gap between the zoom lens barrel body 1 and the mandrel 2. Insert the pin 11 into the pin hole of the process to ensure the positioning of the curved groove 9 during multiple clamping and milling. Finally, press the entire assembly on the workbench with the end face of the tooling base 4 to perform rigid milling of the curved groove 9 to ensure the curve. Groove 9 machining accuracy.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a cam curve zoom lens cone high accuracy milling process is with anchor clamps which characterized in that includes: the centering device comprises a mandrel (2), a centering ring (3) and a tool base (4); 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 the 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 centering ring (3) is pressed to cause the diameter of an inner hole and the diameter of an outer circle to change, the pressed aperture of the inner hole is reduced and is contacted with the outer circle at one end part of the mandrel (2), and the pressed aperture of the outer circle is increased and matched with the counter bore of the tool base (4); the mandrel cover (5) is fixed on the end face of the other end of the mandrel (2) through a screw (8); an annular gap is formed between the outer wall of the other end of the mandrel (2) and the inner wall of the other end of the zoom lens barrel body (1), after the clamp is preheated, molten filling wax (6) is filled in the gap, after the molten filling wax (6) is solidified, the zoom lens barrel body (1) and the tool base (4) are integrally installed on a workbench surface, and finally pins (11) are inserted between the matched end surfaces of the zoom lens barrel body (1) and the tool base (4) for milling and positioning.

2. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 1, wherein four groups of guide grooves (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 guide groove bottoms is designed into a gradient structure, and the angle is 2-3 degrees.

3. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 2, wherein 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 covers the opening side of the weight-reducing counter bore (7).

4. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 3, wherein 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.

5. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 4, wherein a pin (11) is designed between any two screws (8) and is used for determining the initial position when the cam curve zoom lens barrel body (1) is clamped and machined on the curve groove (9) on the outer circle of the zoom lens barrel body (1) for multiple times.

6. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 5, 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.

7. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 6, wherein the flatness of the two end surfaces of the fixture base (4) is required to be 0.01-0.02; the perpendicularity between the counter bore of the tool base (4) and the assembly end face of one end of the zoom lens cone body (1) is required to be 0.01-0.02.

8. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 7, wherein the coaxiality of the middle 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.

9. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 8, 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.

10. The fixture for milling the cam curve zoom lens barrel with high precision according to claim 9, 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.