Method for polishing aspheric die core

Abstract

The invention provides a method for polishing an aspheric surface mold core, which comprises the following steps of: fixing the mold core: fixing the mold core by using a clamp, placing the fixed mold core in a grinding cavity of a sand blasting machine, and adjusting the position of a spray head: improving the spray head of the sand blasting machine, mounting upper moving mechanisms on the side wall and the top wall of the grinding cavity of the sand blasting machine, the spray heads are installed at the moving end of the moving mechanism, the angle of the spray heads is adjusted, the telescopic mechanism is installed at the moving end of the moving mechanism, and the spray heads in the sand blasting machine are connected with the telescopic end of the telescopic mechanism, so that the spray heads spray polishing sand grains at different angles; according to the technical scheme, the sand blasting machine is suitable for carrying out surface sand blasting and polishing on the mold cores with different calibers, and compared with manual polishing, the polishing quality is higher and more stable, so that the effect required by customer drawings is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mold core polishing, and in particular to a method for polishing a non-spherical mold core. Background Art

[0002] With the increasing application of aspheric optical glass imaging, the requirements for the appearance quality of aspheric lenses are getting higher and higher, so the surface polishing quality of aspheric molds must also be improved accordingly, especially for molds with mirror and high-gloss surfaces, which have higher requirements for mold surface roughness and thus higher requirements for polishing. Polishing is a very important process in the production of aspheric molds. Polishing not only increases the beauty of the mold, but also improves the corrosion resistance, wear resistance and coating performance of the material surface. It can also facilitate subsequent lens pressing, such as increasing the service life of the film layer and reducing the mold repair cycle.

[0003] With the increasing application of aspheric optical glass imaging, the requirements for the appearance quality of aspheric lenses are getting higher and higher, so the surface polishing quality of aspheric molds must also be improved accordingly. Since manual polishing is particularly dependent on personnel, the technical level and stability of polishing personnel are required to be high, and the training cycle of personnel is very long;

[0004] Specifically, the skills of the personnel and the severity of the personnel's techniques will have a qualitative change on the mold core surface. Newcomers lack experience and do not have a good grasp of grinding technology, which can easily cause the surface shape to be out of tolerance, resulting in a large number of repairs and affecting production;

[0005] Stability: When the physical and mental state of the polisher is poor, it is impossible to accurately judge the requirements of polishing strength, etc., resulting in mold grinding failure and affecting production;

[0006] Training cycle: The personnel start with education on surface recognition, learn to grind mold cores with smooth surfaces, and practice various mold core materials. The current training cycle is about half a year.

[0007] In view of the above, a method for polishing an aspherical mold core is proposed to solve the problems existing in current artificial sandblasting. Summary of the invention

[0008] The embodiment of the present invention provides a method for polishing a non-spherical mold core.

[0009] In view of the above problems, the technical solution proposed by the present invention is:

[0010] A method for polishing an aspherical mold core comprises the following steps:

[0011] S1, test blasting: adjust the unloaded sandblasting machine to ensure smooth flow of sand in the pipeline;

[0012] S2, fix the mold core: fix the mold core with a clamp and place the fixed mold core in the grinding chamber of the sandblasting machine;

[0013] S3, adjusting the nozzle position: improving the nozzle of the sandblasting machine, installing a moving mechanism on the side wall and the top wall of the sandblasting machine's grinding chamber, and installing the nozzle on the moving end of the moving mechanism, so that there are three groups of moving nozzles in the sandblasting machine's grinding chamber, so as to perform sandblasting and polishing treatment on different positions of the top and side surfaces of the mold core;

[0014] S4, adjusting the nozzle angle: a telescopic mechanism is installed on the moving end of the moving mechanism, and the nozzle in the sandblasting machine is connected to the telescopic end of the telescopic mechanism, so that the nozzle sprays the grinding sand at different angles, thereby increasing the polishing range;

[0015] S5, polishing: start three groups of nozzles, which use negative pressure to spray out the grinding sand in the storage tank of the sandblasting machine, so as to polish the mold core;

[0016] S6, testing the polishing quality: the polished mold core is taken out from the grinding chamber of the sandblasting machine, and the polishing quality of the mold core is measured by an instrument.

[0017] As a preferred technical solution of the present invention, the standard for testing the spraying in step S1 is that the sand particles are in a uniform suspended flow state in the pipeline, and the standard for the air volume is that the air flow rate in the pipeline is greater than the settling velocity of the largest sand particles, and the wind pressure is sufficient to overcome the friction loss and resistance of the air in the pipeline to push the sand particles to flow, so as to ensure the smooth flow of sand particles in the pipeline.

[0018] As a preferred technical solution of the present invention, the clamp in step S2 is a pneumatic clamp, and the shape of the clamp head matches the shape of the mold core.

[0019] As a preferred technical solution of the present invention, the moving mechanism in step S3 includes a linear motor and a slider, and the linear motor is installed on the side wall and top wall of the grinding chamber of the sandblasting machine, and the moving end is a slider, which is driven by the linear motor to slide on the linear motor.

[0020] As a preferred technical solution of the present invention, the input ends of the three groups of nozzles in step 3 are all connected to the first pipe, the outside of the storage tank of the sandblasting machine in step S5 is connected to the sandblasting pipe, the free ends of the three groups of first pipes are all connected to the solenoid valves, and the free ends of the solenoid valves are all connected to the second pipe, and a four-way valve is connected between the three groups of second pipes and the sandblasting pipe.

[0021] As a preferred technical solution of the present invention, micro switches are installed on the tops of both ends of the linear motor, and the side surfaces of the slider are pressed against the micro switches, and the micro switches control the operation mode of the linear motor.

[0022] As a preferred technical solution of the present invention, the telescopic mechanism in step S4 includes an electric telescopic rod and a fixed rod, the bottom end of the fixed rod is installed on the slider, the base of the electric telescopic rod is rotatably installed on the slider, and the centers of the electric telescopic rod and the fixed rod are on the same vertical straight line, and the top end of the fixed rod and the telescopic end of the electric telescopic rod are rotatably installed on the bottom surface of the nozzle.

[0023] As a preferred technical solution of the present invention, during the polishing process in step S5, the angle and position of the nozzle are continuously adjusted to achieve the purpose of changing the position and angle of the sand particles being sprayed out while polishing. At the same time, after polishing the top surface and two side surfaces of the mold core, the mold core is rotated and turned over, and then fixed with a clamp so that the nozzle polishes the bottom surface and the remaining two side surfaces of the mold core.

[0024] As a preferred technical solution of the present invention, the instrument in step S6 includes but is not limited to an optical microscope, a scanning electron microscope, a surface roughness meter, and a profilometer.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. Use a nozzle with variable angle and position to increase the polishing range of the mold core, so as to achieve the purpose of polishing mold cores of different sizes;

[0027] 2. Use three sets of nozzles to polish the three surfaces of the mold core at the same time to improve the polishing efficiency of the mold core;

[0028] 3. The three groups of nozzles can be started independently, so the number of nozzles started can be changed at will. When there are less than three surfaces to be polished, this method can reduce the amount of sand used.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flowchart of a method for polishing a non-spherical mold core disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Example 1, refer to the attached Figure 1As shown, a method for polishing an aspheric mold core comprises the following steps:

[0033] S1, test blasting: adjust the unloaded sandblasting machine to ensure smooth flow of sand in the pipeline;

[0034] S2, fix the mold core: fix the mold core with a clamp and place the fixed mold core in the grinding chamber of the sandblasting machine;

[0035] S3, adjusting the nozzle position: improving the nozzle of the sandblasting machine, installing a moving mechanism on the side wall and the top wall of the sandblasting machine's grinding chamber, and installing the nozzle on the moving end of the moving mechanism, so that there are three groups of moving nozzles in the sandblasting machine's grinding chamber, so as to perform sandblasting and polishing treatment on different positions of the top and side surfaces of the mold core;

[0036] S4, adjusting the nozzle angle: a telescopic mechanism is installed on the moving end of the moving mechanism, and the nozzle in the sandblasting machine is connected to the telescopic end of the telescopic mechanism, so that the nozzle sprays the grinding sand at different angles, thereby increasing the polishing range;

[0037] S5, polishing: start three groups of nozzles, which use negative pressure to spray out the grinding sand in the storage tank of the sandblasting machine, so as to polish the mold core;

[0038] S6, testing the polishing quality: the polished mold core is taken out from the grinding chamber of the sandblasting machine, and the polishing quality of the mold core is measured by an instrument.

[0039] As a preferred technical solution of the present invention, the standard for testing the spraying in step S1 is that the sand particles are in a uniform suspended flow state in the pipeline, and the standard for the air volume is that the air flow rate in the pipeline is greater than the settling velocity of the largest sand particles, and the wind pressure is sufficient to overcome the friction loss and resistance of the air in the pipeline to push the sand particles to flow, so as to ensure the smooth flow of sand particles in the pipeline.

[0040] Specifically, the performance of the sandblasting machine is adjusted before polishing, so that the possibility of accidents during the subsequent polishing process can be reduced, thereby improving the stability of equipment operation.

[0041] As a preferred technical solution of the present invention, the clamp in step S2 is a pneumatic clamp, and the shape of the clamp head matches the shape of the mold core.

[0042] As a preferred technical solution of the present invention, the moving mechanism in step S3 includes a linear motor and a slider, and the linear motor is installed on the side wall and top wall of the grinding chamber of the sandblasting machine, and the moving end is a slider, which is driven by the linear motor to slide on the linear motor.

[0043] As a preferred technical solution of the present invention, the input ends of the three groups of nozzles in step 3 are all connected to the first pipe, the outside of the storage tank of the sandblasting machine in step S5 is connected to the sandblasting pipe, the free ends of the three groups of first pipes are all connected to the solenoid valves, and the free ends of the solenoid valves are all connected to the second pipe, and a four-way valve is connected between the three groups of second pipes and the sandblasting pipe.

[0044] Specifically, the four-way valve can be used to allow sand to enter the three groups of second pipes, the solenoid valve can be used to control the opening and closing of the connection between the first pipe and the second pipe, and the air compressor in the nozzle can form a negative pressure in the nozzle through the high-speed movement of the airflow, so that the sand is sucked into the nozzle through the sandblasting pipe, the first pipe, and the second pipe and ejected through the nozzle. Based on the above method, by changing the opening and closing of the three groups of solenoid valves and the start and stop of the three groups of nozzles, the sand can be controlled to be ejected from a certain nozzle.

[0045] As a preferred technical solution of the present invention, micro switches are installed on the tops of both ends of the linear motor, and the side surfaces of the slider are pressed against the micro switches, and the micro switches control the operation mode of the linear motor.

[0046] Specifically, when the slider moves to one end of the linear motor and squeezes the micro switch at that end, the micro switch can change the running direction of the linear motor, causing the slider to move toward the other side, thereby achieving the purpose of automatically changing the moving direction of the slider.

[0047] As a preferred technical solution of the present invention, the telescopic mechanism in step S4 includes an electric telescopic rod and a fixed rod, the bottom end of the fixed rod is installed on the slider, the base of the electric telescopic rod is rotatably installed on the slider, and the centers of the electric telescopic rod and the fixed rod are on the same vertical straight line, and the top end of the fixed rod and the telescopic end of the electric telescopic rod are rotatably installed on the bottom surface of the nozzle.

[0048] Specifically, the electric telescopic rod capable of changing the angle can realize the function of lifting or pulling the nozzle when it is extended or retracted, thereby achieving the purpose of changing the angle of the nozzle.

[0049] As a preferred technical solution of the present invention, during the polishing process in step S5, the angle and position of the nozzle are continuously adjusted to achieve the purpose of changing the position and angle of the sand particles being sprayed out while polishing. At the same time, after polishing the top surface and two side surfaces of the mold core, the mold core is rotated and turned over, and then fixed with a clamp so that the nozzle polishes the bottom surface and the remaining two side surfaces of the mold core.

[0050] Specifically, the start and stop of the linear motor, the electric telescopic rod, the solenoid valve, and the nozzle are controlled by a controller outside the sandblasting machine.

[0051] As a preferred technical solution of the present invention, the instrument in step S6 includes but is not limited to an optical microscope, a scanning electron microscope, a surface roughness meter, and a profilometer.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for polishing an aspheric mold core, characterized in that: The following steps are involved: S1, test blasting: adjust the unloaded sandblasting machine to ensure smooth flow of sand in the pipeline; S2, fix the mold core: fix the mold core with a clamp and place the fixed mold core in the grinding chamber of the sandblasting machine; S3, adjusting the nozzle position: improving the nozzle of the sandblasting machine, installing a moving mechanism on the side wall and the top wall of the sandblasting machine's grinding chamber, and installing the nozzle on the moving end of the moving mechanism, so that there are three groups of moving nozzles in the sandblasting machine's grinding chamber, so as to perform sandblasting and polishing treatment on different positions of the top and side surfaces of the mold core; S4, adjusting the nozzle angle: a telescopic mechanism is installed on the moving end of the moving mechanism, and the nozzle in the sandblasting machine is connected to the telescopic end of the telescopic mechanism, so that the nozzle sprays the grinding sand at different angles, thereby increasing the polishing range; S5, polishing: start three groups of nozzles, which use negative pressure to spray out the grinding sand in the storage tank of the sandblasting machine, so as to polish the mold core; S6, testing the polishing quality: the polished mold core is taken out from the grinding chamber of the sandblasting machine, and the polishing quality of the mold core is measured by an instrument.

2. A method for polishing a non-spherical mold core according to claim 1, characterized in that: The standard for testing the spraying in step S1 is that the sand particles are in a uniform suspended flow state in the pipeline, and the standard for the air volume is that the air flow rate in the pipeline is greater than the settling velocity of the largest sand particles, and the wind pressure is sufficient to overcome the friction loss and resistance of the air in the pipeline to push the sand particles to flow, so as to ensure the smooth flow of the sand particles in the pipeline.

3. A method for polishing a non-spherical mold core according to claim 1, characterized in that: The clamp in step S2 is a pneumatic clamp, and the shape of the clamp head matches the shape of the mold core.

4. A method for polishing a non-spherical mold core according to claim 1, characterized in that: The moving mechanism in step S3 includes a linear motor and a slider, and the linear motor is installed on the side wall and top wall of the grinding chamber of the sandblasting machine, and the moving end is a slider, which is driven by the linear motor to slide on the linear motor.

5. A method for polishing an aspherical mold core according to claim 4, characterized in that: The input ends of the three groups of nozzles in step 3 are all connected to the first pipe, the outer side of the storage tank of the sandblasting machine in step S5 is connected to the sandblasting tube, the free ends of the three groups of first pipes are all connected to the solenoid valves, and the free ends of the solenoid valves are all connected to the second pipe, and a four-way valve is connected between the three groups of second pipes and the sandblasting tube.

6. A method for polishing a non-spherical mold core according to claim 5, characterized in that: Micro switches are installed on the tops of both ends of the linear motor, and the side surfaces of the slider are pressed against the micro switches, and the micro switches control the operation mode of the linear motor.

7. A method for polishing a non-spherical mold core according to claim 6, characterized in that: The telescopic mechanism in step S4 includes an electric telescopic rod and a fixed rod, the bottom end of the fixed rod is mounted on the slider, the base of the electric telescopic rod is rotatably mounted on the slider, and the centers of the electric telescopic rod and the fixed rod are on the same vertical straight line, and the top end of the fixed rod and the telescopic end of the electric telescopic rod are rotatably mounted on the bottom surface of the nozzle.

8. The method for polishing a non-spherical mold core according to claim 1, characterized in that: During the polishing process in step S5, the angle and position of the nozzle are continuously adjusted to achieve the purpose of changing the position and angle of the sand particles being sprayed out while polishing. At the same time, after polishing the top surface and two side surfaces of the mold core, the mold core is rotated and turned over, and then fixed with a clamp so that the nozzle polishes the bottom surface and the remaining two side surfaces of the mold core.

9. A method for polishing a non-spherical mold core according to claim 1, characterized in that: The instruments in step S6 include but are not limited to an optical microscope, a scanning electron microscope, a surface roughness meter, and a profilometer.

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