Numerical control milling fixture for processing eyeglass frames

Abstract

The utility model discloses a numerical control milling fixing clamp for glasses frame processing, including fixedly clamping lower seat, be equipped with the positioning pipe on fixedly clamping lower seat, the positioning pipe is used for inserting to glasses frame body, be equipped with the first perforation on glasses frame body, can insert the positioning stake in the first perforation, the positioning stake can insert into the positioning pipe, fixedly clamping lower seat has the cavity of hollow, can form the vacuum environment in fixedly clamping lower seat for the adsorption of positioning stake, the positioning stake can force glasses frame body to be compact on the positioning pipe, the number of positioning pipe is not less than two. This structure is through the mode that vacuum adsorption and mechanical positioning are combined, realized the quick, stable clamping of glasses frame body, and multiple positioning pipes cooperate, not only improved the clamping accuracy, can effectively prevent glasses frame from happening displacement or vibration in high -speed milling process, thereby significantly improve processing quality and efficiency, avoid the problem that glasses frame surface is damaged because of rigid compactness of traditional fixture simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of eyeglass frame processing equipment, and in particular to a CNC milling fixture for eyeglass frame processing. Background Technology

[0002] As a precision wearable device, eyeglass frames are complex in shape and small in size, and are often made of lightweight polymer materials or metal alloys, requiring extremely high processing precision and surface quality. Key parts such as contour curves, hinge mounting holes, nose pads and decorative grooves need to be precisely shaped by CNC milling to ensure the assembly matching of each component, wearing comfort and overall appearance consistency.

[0003] In existing technologies, traditional fixtures mostly use rigid pressure plates or elastic jaws to hold eyeglass frames, which are prone to deformation or surface scratches due to local stress concentration. At the same time, the positioning accuracy is insufficient, and vibration is easily generated during high-speed milling, affecting the consistency of processing and making it difficult to meet the needs of efficient and precise processing of eyeglass frames with multiple varieties and small batches. Utility Model Content

[0004] The purpose of this invention is to provide a CNC milling fixture for processing eyeglass frames, so as to solve the problem that traditional fixtures easily damage eyeglass frames as mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a CNC milling fixture for processing eyeglass frames, comprising a lower fixture base, a positioning tube on the lower fixture base, the positioning tube being inserted into the eyeglass frame body, a first through hole on the eyeglass frame body, a positioning post being inserted into the first through hole, the positioning post being inserted into the positioning tube, the lower fixture base having a hollow cavity, the lower fixture base being able to form a vacuum environment for adsorbing the positioning post, the positioning post being able to force the eyeglass frame body to press tightly onto the positioning tube, and the number of positioning tubes being not less than two.

[0006] Based on the preferred embodiment of this technical solution, a blind hole is provided coaxially on the eyeglass frame body at the position corresponding to the first perforation, and the diameter of the blind hole is smaller than the diameter of the first perforation.

[0007] In the preferred embodiment of this technical solution, the positioning tube is interference-fitted into the blind hole, and the positioning tube is made of plastic.

[0008] Based on the preferred embodiment of this technical solution, the positioning post includes an insert rod and a hemisphere integrally formed on the insert rod. The spherical surface of the hemisphere can fit the eyeglass frame body, and the insert rod is used to seal the inner diameter of the positioning tube.

[0009] Based on the preferred embodiment of this technical solution, the lower seat of the fixing clamp is integrally formed with a high-pressure pad, and the positioning tube is integrally formed on the high-pressure pad. The high-pressure pad and the positioning tube are coaxially arranged, and the diameters of the high-pressure pad and the positioning tube are the same.

[0010] Based on the preferred embodiment of this technical solution, the fixing clamp includes a lower housing and an upper housing. The lower housing is provided with a countersunk hole, into which a countersunk bolt can be inserted for spiral connection with the upper housing. A second annular sealing ring can be placed on the lower housing, which is used to seal the joint between the lower housing and the upper housing.

[0011] Based on the preferred embodiment of this technical solution, an air passage connector is integrally formed on the lower housing, which is used to connect to a vacuum source.

[0012] In the preferred embodiment of this technical solution, connecting bolts can be inserted through the lower housing, which are used to install and fix the lower housing. A first sealing ring is attached to the lower housing, and the connecting bolts can press the first sealing ring tightly.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. By combining vacuum adsorption with hemispherical bonding and pressing, the frame can be clamped without damage, effectively avoiding surface scratches or elastic deformation caused by rigid pressing. It is especially suitable for frames made of polymer materials such as TR90.

[0014] 2. The use of multi-positioning tubes for collaborative positioning and a stepped perforation structure significantly improves the coaxiality of the clamping and the repeatability of positioning, ensuring that the frame remains stable and does not shift during high-speed milling, thereby improving machining consistency and production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the structure of a CNC milling fixture for processing eyeglass frames according to this utility model. Figure 2 This is a schematic diagram of the high-pressure section structure of the present invention; Figure 3 This is a schematic diagram of the positioning pile structure of this utility model; Figure 4 This is a schematic diagram of the blind hole structure of this utility model; Figure 5 This is a schematic diagram of the lower shell structure of this utility model.

[0016] Explanation of reference numerals in the attached drawings: 1. Lower fixing clamp; 11. Lower housing; 111. Countersunk hole; 112. Connecting bolt; 113. Air passage pipe; 1141. First sealing ring; 12. Upper housing; 121. Gasket tube; 122. Positioning tube; 123. Positioning post; 1231. Insert rod; 1232. Hemisphere; 2. Eyeglass frame body; 21. First through hole; 22. Blind hole. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 This utility model provides an embodiment of a CNC milling fixture for processing eyeglass frames, including a lower fixture 1 with a positioning tube 122 for insertion into the eyeglass frame body 2. The eyeglass frame body 2 has a first through hole 21 into which a positioning post 123 can be inserted. The positioning post 123 can be inserted into the positioning tube 122. The lower fixture 1 has a hollow cavity, creating a vacuum environment for adsorbing the positioning post 123. The positioning post 123 forces the eyeglass frame body 2 to press firmly against the positioning tube 122. There are at least two positioning tubes 122. This structure achieves rapid and stable clamping of the eyeglass frame body 2 through a combination of vacuum adsorption and mechanical positioning. The multiple positioning tubes 122 work together to improve clamping accuracy and effectively prevent displacement or vibration of the eyeglass frame during high-speed milling, thus significantly improving processing quality and efficiency. It also avoids the problem of surface damage to the eyeglass frame caused by rigid clamping in traditional fixtures.

[0019] Please see Figure 1-5 A further solution based on this embodiment is as follows: a blind hole 22 is coaxially provided on the eyeglass frame body 2 at the position corresponding to the first through hole 21, and the diameter of the blind hole 22 is smaller than the diameter of the first through hole 21. This stepped double-hole structure facilitates the layered cooperation between the positioning tube 122 and the positioning post 123, ensuring the stable insertion of the positioning tube 122 and providing sufficient clamping space for the positioning post 123, thereby improving the coaxiality and repeatability of the overall clamping.

[0020] Please see Figure 1-4 A further solution based on this embodiment is as follows: the positioning tube 122 is interference-fitted into the blind hole 22, and the positioning tube 122 is made of plastic. The positioning tube 122 made of plastic has good elasticity and wear resistance. The interference fit can achieve gapless positioning, while avoiding metal contact that could scratch the frame. It is especially suitable for processing eyeglass frames made of high-gloss or lightweight materials.

[0021] Please see Figure 1-4A further embodiment of this solution is as follows: the positioning post 123 includes an insertion rod 1231 and a hemisphere 1232 integrally formed on the insertion rod 1231. The spherical surface of the hemisphere 1232 can fit the eyeglass frame body 2. The insertion rod 1231 is used to seal the inner diameter of the positioning tube 122. The structure of the hemisphere 1232 can adapt to the curvature of the eyeglass frame surface, achieve uniform pressing, and reduce local stress concentration. While providing a force transmission channel, the insertion rod 1231 helps maintain the local sealing of the vacuum cavity and enhances the adsorption stability.

[0022] Please see Figure 2-5 A further embodiment of this solution is as follows: a high-volume support tube 121 is integrally formed on the lower base 1 of the fixing clamp, and a positioning tube 122 is integrally formed on the high-volume support tube 121. The high-volume support tube 121 and the positioning tube 122 are coaxially arranged, and the diameters of the high-volume support tube 121 and the positioning tube 122 are the same. The integrated design improves the structural rigidity and manufacturing precision. The high-volume support tube 121 raises the positioning area, making it easier for the milling cutter to avoid it, while ensuring unobstructed air passage, which is conducive to the effective transmission of vacuum adsorption force.

[0023] Please see Figure 2-5 A further solution based on this embodiment is as follows: the lower clamping seat 1 includes a lower housing 11 and an upper housing 12. The lower housing 11 is provided with a countersunk hole 111, into which a countersunk bolt can be inserted for spiral connection with the upper housing 12. A second annular sealing ring can be placed on the lower housing 11, which is used to seal the joint between the lower housing 11 and the upper housing 12. The split housing facilitates internal cleaning and maintenance, the countersunk bolt connection ensures a smooth appearance, and the annular sealing ring effectively prevents vacuum leakage, ensuring long-term stable operation of the clamp.

[0024] Please see Figure 2-4 A further solution based on this embodiment is as follows: an integrated gas pipe 113 is formed on the lower housing 11, which is used to connect to a vacuum source. The integrated gas pipe 113 simplifies external pipeline connections, improves sealing reliability, reduces the risk of leakage, and facilitates rapid integration into automated production lines.

[0025] Please see Figure 1-5 A further solution based on this embodiment is as follows: a connecting bolt 112 can be passed through the lower housing 11. The connecting bolt 112 is used to install and fix the lower housing 11. A first sealing ring 1141 is attached to the lower housing 11, and the connecting bolt 112 can press the first sealing ring 1141 tightly. By pressing the sealing ring with bolts, both the fixture body and the machine tool table are firmly installed, and the airtightness of the installation interface is ensured to prevent external air from seeping in and affecting the vacuum adsorption effect.

[0026] Working principle: First, the eyeglass frame body 2 is fitted onto at least two positioning tubes 122 on the lower fixing clamp 1, so that the positioning tubes 122 are inserted into the blind holes 22 of the eyeglass frame body 2 to achieve radial positioning; then, the positioning post 123 is inserted from top to bottom into the first through hole 21 of the eyeglass frame body 2, with its insertion rod 1231 extending into the interior of the positioning tube 122, while the hemisphere 1232 is attached to the upper surface of the eyeglass frame body 2. At this time, an external vacuum source is connected through the air passage pipe 113, so that the hollow cavity inside the lower fixing clamp 1 is formed into a negative pressure environment. The vacuum suction force acts on the bottom of the insertion rod 1231 of the positioning post 123, pulling it downward and tightening it; this pulling force is transmitted through the insertion rod 1231 to the hemisphere 1232, thereby forcing the eyeglass frame body 2 to be tightly pressed against the end face of the positioning tube 122. Thus, the eyeglass frame body 2 is reliably pressed in the axial direction and precisely positioned in the radial direction. The overall clamping is stable and without rigid pressure, effectively avoiding processing deformation or surface damage, and meeting the high precision and high stability clamping requirements of CNC milling. The first through hole 21 and blind hole 22 can be used as decorative holes, or they can be sealed with decorative parts later.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A numerical control milling fixture for processing eyeglass frames, characterized by: It includes a fixing clip lower seat (1), a positioning tube (122) on the fixing clip lower seat (1), the positioning tube (122) is used to be inserted into the eyeglass frame body (2), the eyeglass frame body (2) is provided with a first through hole (21), a positioning post (123) can be inserted into the first through hole (21), the positioning post (123) can be inserted into the positioning tube (122), the fixing clip lower seat (1) has a hollow cavity, the fixing clip lower seat (1) can form a vacuum environment for adsorbing the positioning post (123), the positioning post (123) can force the eyeglass frame body (2) to press tightly on the positioning tube (122), and the number of positioning tubes (122) is not less than two.

2. The CNC milling fixture for processing eyeglass frames according to claim 1, characterized in that: A blind hole (22) is provided coaxially on the main body (2) of the eyeglass frame, corresponding to the position of the first perforation (21). The diameter of the blind hole (22) is smaller than the diameter of the first perforation (21).

3. The CNC milling fixture for processing eyeglass frames according to claim 2, characterized in that: The positioning tube (122) is interference-fitted into the blind hole (22), and the positioning tube (122) is made of plastic.

4. The CNC milling fixture for processing eyeglass frames according to claim 3, characterized in that: The positioning post (123) includes a rod (1231) and a hemisphere (1232) integrally formed on the rod (1231). The spherical surface of the hemisphere (1232) can fit the eyeglass frame body (2). The rod (1231) is used to seal the inner diameter of the positioning tube (122).

5. The CNC milling fixture for processing eyeglass frames according to claim 4, characterized in that: The lower base of the fixing clamp (1) has an integrally formed pad tube (121) and an integrally formed positioning tube (122) on the pad tube (121). The pad tube (121) and the positioning tube (122) are coaxially arranged, and the pad tube (121) and the positioning tube (122) have the same hole diameter.

6. The CNC milling fixture for processing eyeglass frames according to claim 5, characterized in that: The fixing clamp lower seat (1) includes a lower shell seat (11) and an upper shell seat (12). The lower shell seat (11) is provided with a countersunk hole (111). A countersunk bolt can be inserted into the countersunk hole (111) and screwed into the upper shell seat (12). A second annular sealing ring can be placed on the lower shell seat (11). The second annular sealing ring is used to seal the joint between the lower shell seat (11) and the upper shell seat (12).

7. The CNC milling fixture for machining eyeglass frames according to claim 6, characterized in that: The lower housing (11) has an integrally formed gas passage pipe (113) for connecting to a vacuum source.

8. The CNC milling fixture for processing eyeglass frames according to claim 7, characterized in that: A connecting bolt (112) can be inserted through the lower housing (11). The connecting bolt (112) is used to install and fix the lower housing (11). A first sealing ring (1141) is attached to the lower housing (11). The connecting bolt (112) can press the first sealing ring (1141) tightly.

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