A method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator

Abstract

The present invention relates to a method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator. The soft resin polishing head comprises a metal clamping rod and a polishing head located at the bottom of the metal clamping rod. The metal clamping rod comprises a clamping rod portion and a connecting portion located at the lower end of the clamping rod portion, and the connecting portion is used to connect with the polishing head. The clamping rod portion is a hollow circular shaft structure. The molding die used comprises an upper mold and a lower mold. The middle of the upper mold is a stepped through hole. The molding cavity of the lower mold is a 1:1 replica of the inner surface shape of the hemispherical resonator. The molding method comprises the following steps: (1) preparing a resin mixture; (2) installing the clamping rod; (3) closing the mold; (4) injection molding; (5) curing; and (6) opening the mold. The resin polishing head produced by the present invention can completely fit the inner surface of the hemispherical resonator, thereby improving the material removal efficiency and reducing time and economic costs.

Description

Technical Field

[0001] The invention relates to the technical field of hemispherical resonator inner surface polishing, in particular to a method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator. Background Art

[0002] At present, the main method for polishing the inner surface of a hemispherical resonator is to use a small polishing head to perform single-point processing on its inner surface. This method has the disadvantages of low processing efficiency and inconsistent material removal rate and surface roughness due to the need for path planning by the CNC system during the single-point processing. At the same time, there are also defects such as low processing efficiency, poor molding quality, and complex processing process due to the need to adopt a four-axis three-link motion form to improve processing accuracy, that is, the need to use three linear motions of X, Y, and Z and a C-axis platform to drive the rotation of the polishing head. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator, the soft resin polishing head comprising a metal clamping rod and a polishing head located at the bottom of the metal clamping rod, the metal clamping rod comprising a clamping rod portion and a connecting portion located at the lower end of the clamping rod portion, the connecting portion being used to connect to the polishing head;

[0006] The clamping rod is a hollow circular shaft structure as a whole, and the upper end of the clamping rod serves as a liquid injection port. The clamping rod is also used to clamp and fix with the machine tool;

[0007] The molding die used includes an upper mold and a lower mold. The middle of the upper mold is a stepped through hole for installing the clamping rod. The molding cavity of the lower mold is a 1:1 replica of the inner surface shape of the hemispherical resonator.

[0008] The molding method comprises the following steps:

[0009] (1) Preparation of resin mixture;

[0010] (2) Clamping rod installation: insert the clamping rod portion of the metal clamping rod into the stepped through hole of the upper mold, and then fix the metal clamping rod;

[0011] (3) Mold closing: After fixing the metal clamping rod, align the joints of the upper mold and the lower mold and close the mold, where the stepped cone of the metal clamping rod is located in the molding cavity of the lower mold;

[0012] (4) Injection molding: slowly inject the prepared resin mixture into the molding cavity of the molding mold through the injection port above the clamping rod;

[0013] (5) Curing: After the mixed resin is injected, place the mold in a ventilated environment and wait for the resin to fully cure;

[0014] (6) Mold opening: When the resin is fully cured, open the upper and lower molds of the molding mold and take out the molded soft resin polishing head.

[0015] Furthermore, the preparation method of the resin mixture is as follows: using resin as a binder, cobalt water as an accelerator, methyl ethyl ketone peroxide as a curing agent, and diamond abrasives as an abrasive, the binder, accelerator, curing agent and abrasives are mixed in proportion and fully stirred into a paste, wherein the mass fractions of various additives in 100 grams of mixed resin are: accelerator 1%, curing agent 2%, diamond abrasives 5%, and binder 92%.

[0016] Furthermore, the connecting portion is a stepped frustum.

[0017] Furthermore, a notch is provided on the side of the stepped cone.

[0018] Furthermore, threaded through holes are processed on both sides of the stepped through hole for installing fastening bolts. When in use, the two fastening bolts are respectively screwed into the threaded through holes on both sides to fix the clamping rod; two vent holes are processed on both sides of the upper mold; and exhaust holes corresponding to the vent holes are respectively provided on both sides of the connecting part.

[0019] Furthermore, the connection between the upper mold and the lower mold is designed to be a concave frustum and a convex frustum structure that fit together, and a transition fit is adopted between the concave frustum and the convex frustum.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects:

[0021] The resin polishing head produced by the present invention can completely fit the inner surface of the hemispherical resonator, effectively preventing interference between the processing tool and the workpiece during the processing. During processing, it is only necessary to insert the metal clamping rod into the spring jacket of the processing machine tool and apply a certain positive pressure to the polishing head, so that the polishing head can fully contact the inner surface of the hemispherical resonator. The main shaft rotates to drive the polishing head to rotate so that it moves relative to the inner surface of the hemispherical resonator, thereby achieving the purpose of material removal. The polishing head produced by this method can be processed using an ordinary three-axis machine tool. The processing process is simple and convenient, and does not require processing path planning through a numerical control system. Therefore, interpolation errors can be effectively avoided to ensure the surface roughness of the processed surface. It also changes the traditional single-point processing method, improves material removal efficiency, and reduces time and economic costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 This is a front view of the soft resin polishing head;

[0024] Figure 2 It is a front view of the metal clamping rod;

[0025] Figure 3 is a top view of the metal clamping rod;

[0026] Figure 4 is a cross-sectional view of the forming die;

[0027] Figure 5 This is a top view of the upper mold. DETAILED DESCRIPTION

[0028] like Figure 1-5 As shown, the present invention provides a method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator. The material of the soft resin polishing head is common 45 steel, including a metal clamping rod 10 and a polishing head 20 located at the bottom of the metal clamping rod 10. The metal clamping rod 10 includes a clamping rod portion 30 and a connecting portion located at the lower end of the clamping rod portion 30, wherein the connecting portion is a stepped frustum 40 for connecting to the polishing head 20. The clamping rod portion 30 is a hollow circular shaft structure as a whole. The upper end of the clamping rod portion 30 serves as a liquid injection port 60 to allow resin to be injected into the molding cavity 100 of the molding mold. At the same time, the clamping rod portion 30 is also used to clamp and fix with the machine tool (it is used to connect with the spring clip of the machine tool during the processing of the hemispherical resonator, plays a centering role during clamping, and plays a role in transmitting torque during operation).

[0029] The conical part of the stepped frustum 40 that contacts the resin is stepped, which increases the contact area between the clamping rod 30 and the resin, making the connection between the polishing head 20 and the clamping rod 30 more secure after the resin is cured, and avoiding the separation of the polishing head 20 from the clamping rod due to a loose connection between the polishing head 20 and the clamping during processing; in addition, a notch is provided on the side of the stepped frustum 40, which can further improve the connection reliability between the polishing head 20 and the metal clamping rod 10 (with a bite effect).

[0030] The molding die used in the present invention comprises an upper die 80 and a lower die 110. The entire molding die adopts a split design. The upper die 80 is primarily used to securely install the metal clamping rod 10, while the lower die 110 is primarily used to form the polishing head 20. The center of the upper die 80 is a stepped through-hole 70 for mounting the clamping rod 30. Threaded through-holes 90 are machined on either side of the stepped through-hole 70 for mounting fixing bolts. During use, the two fixing bolts are screwed into the threaded through-holes 90 on either side to secure the clamping rod 30 (applying a certain amount of compressive force to the clamping rod 30 to tighten the metal clamping rod 10). Two ventilation holes 120 are machined on either side of the upper die 80; exhaust holes 50 corresponding to the ventilation holes 120 are provided on either side of the stepped cone 40. The exhaust holes 50 on the stepped frustum 40 correspond to the vent holes 120 of the upper mold 80, ensuring that the gas in the molding cavity 100 can be discharged smoothly. It also helps to remove internal bubbles during curing, avoid the formation of pores due to poor exhaust during curing, and ensure the molding quality of the resin polishing head 20. The molding cavity 100 of the lower mold 110 is a 1:1 replica of the inner surface shape of the hemispherical resonator, ensuring that the polishing head 20 after molding can be completely fitted with the inner surface of the hemispherical resonator, while ensuring the molding quality of the polishing head 20, it also improves the processing quality of the hemispherical resonator. The connection between the upper mold 80 and the lower mold 110 is designed as a concave frustum and a convex frustum structure that match each other, and a transition fit is adopted between the concave frustum and the convex frustum. When closing the mold, you only need to align the concave frustum and the convex frustum and close them with a little force. When opening the mold, you only need to separate them with a little force. The simple design ensures the convenience of processing and a certain degree of airtightness.

[0031] The molding mold material of the present invention is polytetrafluoroethylene (PTFE) with the chemical formula of (C2F4)n. Polytetrafluoroethylene has an extremely low friction coefficient and therefore has strong non-stick properties. It is also resistant to acids, alkalis, and various organic solvents. This not only facilitates demolding after the resin is cured, but also effectively prevents the resin from sticking to the mold during the curing process.

[0032] The molding method of the present invention specifically comprises the following steps:

[0033] (1) Preparation of resin mixture: resin as binder, cobalt water as accelerator, methyl ethyl ketone peroxide (C8H 18 O6) as a curing agent, diamond abrasive grains as abrasives, the binder, accelerator, curing agent and abrasive grains are mixed in proportion and stirred into a paste, wherein the mass fractions of various additives in 100 grams of mixed resin are: accelerator 1%, curing agent 2%, diamond abrasive grains 5%, and binder 92%.

[0034] (2) Clamping rod installation: insert the clamping rod portion 30 of the metal clamping rod 10 into the stepped through hole 70 of the upper mold 80, and then fix the metal clamping rod 10 (screw the fixing bolts into the fixing threaded holes on both sides to tighten the clamping rod portion 30 to prevent the metal clamping rod 10 from falling off due to a long time);

[0035] (3) Mold closing: After fixing the metal clamping rod 10, align the joints of the upper mold 80 and the lower mold 110 and then close the mold, wherein the stepped cone 40 of the metal clamping rod 10 is located in the molding cavity of the lower mold 110;

[0036] (4) Injection molding: slowly inject the prepared resin mixture into the molding cavity 100 of the molding mold through the injection port 60 above the clamping rod 30;

[0037] (5) Curing: After the mixed resin is injected, place the mold in a fume hood and let it stand at room temperature for 6 hours to wait for the resin to fully cure;

[0038] (6) Mold opening: When the resin is fully solidified, open the upper mold 80 and the lower mold 110 of the molding mold, unscrew the fixing bolts on both sides of the upper mold 80, remove it for standby use, and take out the molded soft resin polishing head.

[0039] The working principle of using the soft resin polishing head made by the present invention to polish the inner surface of a hemispherical resonator is as follows: when in use, first the metal clamping rod of the soft resin polishing head is installed in the spring clamp of the machine tool, and the hemispherical resonator is installed on the machine tool to ensure the coaxial accuracy between the two. The machine tool is adjusted to combine the two, and on this basis, a certain pressing force is applied to make the polishing head fully contact with the inner surface of the workpiece. The polishing head is driven to rotate by the main shaft of the machine tool, and the abrasive particles entrained by the soft resin produce relative displacement with the workpiece surface to achieve the purpose of removing material.

[0040] The above describes a specific embodiment of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principles and essence of the present invention, but these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator, characterized by: The soft resin polishing head includes a metal clamping rod and a polishing head located at the bottom of the metal clamping rod, wherein the metal clamping rod includes a clamping rod portion and a connecting portion located at the lower end of the clamping rod portion, and the connecting portion is used to connect with the polishing head; The clamping rod is a hollow circular shaft structure as a whole, and the upper end of the clamping rod serves as a liquid injection port. The clamping rod is also used to clamp and fix with the machine tool; The molding die used includes an upper mold and a lower mold. The middle of the upper mold is a stepped through hole for installing the clamping rod. The molding cavity of the lower mold is a 1:1 replica of the inner surface shape of the hemispherical resonator. Threaded through holes are machined on both sides of the stepped through hole for installing fastening bolts. When in use, the two fastening bolts are screwed into the threaded through holes on both sides to fix the clamping rod; two vent holes are machined on both sides of the upper mold; exhaust holes are respectively provided on both sides of the connecting part corresponding to the vent holes; The connection between the upper mold and the lower mold is designed to be a concave truncated cone and a convex truncated cone structure that match each other, and a transition fit is adopted between the concave truncated cone and the convex truncated cone; The molding method comprises the following steps: (1) Preparation of resin mixture; (2) Clamping rod installation: insert the clamping rod portion of the metal clamping rod into the stepped through hole of the upper mold, and then fix the metal clamping rod; (3) Mold closing: After fixing the metal clamping rod, align the joints of the upper mold and the lower mold and close the mold, where the stepped cone of the metal clamping rod is located in the molding cavity of the lower mold; (4) Injection molding: slowly inject the prepared resin mixture into the molding cavity of the molding mold through the injection port above the clamping rod; (5) Curing: After the mixed resin is injected, place the mold in a ventilated environment and wait for the resin to fully cure; (6) Mold opening: When the resin is fully cured, open the upper and lower molds of the molding mold and take out the molded soft resin polishing head.

2. The method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator according to claim 1, characterized in that: The preparation method of the resin mixture is as follows: using resin as a binder, cobalt water as an accelerator, methyl ethyl ketone peroxide as a curing agent, and diamond abrasive grains as an abrasive, the binder, accelerator, curing agent and abrasive grains are mixed in proportion and then fully stirred into a paste, wherein the mass fractions of various additives in 100 grams of the mixed resin are: accelerator 1%, curing agent 2%, diamond abrasive grains 5%, and binder 92%.

3. The method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator according to claim 1, characterized in that: The connecting portion is a stepped frustum.

4. The method for forming a soft resin polishing head for polishing the inner surface of a hemispherical resonator according to claim 3, characterized in that: A notch is provided on the side surface of the stepped frustum.

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