Inner hole polishing tool for mold production

Abstract

The invention relates to the technical field of mold machining, in particular to an inner hole polishing tool for mold production, which comprises a base, a rotating frame is rotatably connected in the base, a liquid storage seat is arranged above the rotating frame, a filtering mechanism is fixedly connected in the liquid storage seat, and a water pressing seat is fixedly connected in the liquid storage seat. The polishing brush is rotatably connected in the liquid storage seat in a penetrating mode, the water guide sealing seat is fixedly connected to the top end of the liquid storage seat, and the inner hole key groove polishing mechanism is arranged in the water guide sealing seat in a sliding fit mode. The multiple polishing plates making contact with the inner hole key groove can be driven to move up and down in a reciprocating mode, accurate polishing of the key groove part is achieved, the integrity and uniformity of the polishing process are guaranteed, the problem that in a traditional method, polishing of a key groove area is insufficient or uneven is solved, and the polishing quality and efficiency of the inner hole with the key groove can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of mold processing technology, and in particular to an internal hole polishing fixture for mold production. Background Technology

[0002] The internal hole polishing fixture for mold production is mainly used for polishing the surface of the inner hole of the mold. It aims to improve the smoothness of the mold, reduce surface roughness, eliminate burrs, thereby improving the working performance of the mold, extending its service life, and ensuring the precision of the mold.

[0003] The prior art publication CN107116450A provides a polishing fixture for the inner hole of a gear. By setting a fixing ring between the drive shaft of the motor and the polishing roller, the connection strength between the drive shaft and the polishing roller is improved, thereby improving the stability of the polishing roller during the polishing process of the inner hole of the gear and enhancing the polishing quality of the inner hole of the gear. A limit groove is set at the bottom of the bearing groove, and positioning teeth are set on the inner wall of the bearing groove. The positioning teeth improve the stability of the gear in the bearing groove, thereby improving the polishing quality of the inner hole of the gear.

[0004] In existing technology, polishing is performed using polishing rollers. Since the shape and polishing method of polishing rollers are usually designed for circular inner holes, when encountering inner holes with keyways, the polishing rollers cannot accurately cover the keyway area, resulting in unsatisfactory polishing effect on the keyway part, which may lead to uneven wear or defects.

[0005] In summary, the existing technology lacks a polishing technique suitable for internal holes with keyways. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing an internal hole polishing fixture for mold production.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an internal hole polishing fixture for mold production, comprising a base, a rotating frame rotatably connected inside the base, a liquid storage seat above the rotating frame, a filter mechanism fixedly connected inside the liquid storage seat, a water pressure seat fixedly connected inside the liquid storage seat, a polishing brush rotatably connected through the liquid storage seat, a water guiding sealing seat fixedly connected to the top of the liquid storage seat, and an internal hole keyway polishing mechanism slidably fitted inside the water guiding sealing seat.

[0008] Preferably, a plurality of positioning blocks are fixedly connected to the inner wall of the upper end of the base, a mold body is provided above the base, the four corners of the mold body are adapted to the positioning blocks, a plurality of electric push rods A are fixedly connected to the top of the base, a rubber cover is fixedly connected to the output end of the electric push rod A, and the bottom end of the rubber cover abuts against the upper surface of the mold body.

[0009] Preferably, a motor A is fixedly connected to the middle of the rotating frame, extending through the inner wall of the base to the outside. The motor A is fixedly connected to the base. An electric actuator B is fixedly connected to one end of the rotating frame, and the output end of the electric actuator B is fixedly connected to the liquid storage seat.

[0010] Preferably, a valve is fixedly connected to the bottom opening of the liquid storage seat, and a liquid filling port is provided on one side of the top of the liquid storage seat.

[0011] Preferably, the filtration mechanism includes a liquid guide tube, one end of which is fixedly connected to a liquid storage seat and a water-conducting sealing seat, and the other end of which is fixedly connected to a liquid storage seat. A transmission rod is rotatably connected through the liquid guide tube, a driven wheel is fixedly connected to the outer end of the transmission rod, and a transmission sleeve is slidably fitted to the inner end of the transmission rod. A filter tube is fixedly connected to one end of the transmission sleeve, and a connecting plug is rotatably connected to one end of the filter tube. The connecting plug is threadedly connected to one end of the liquid guide tube.

[0012] Preferably, a piston rod is slidably fitted through the inner wall of the top of the water press base, a water inlet pipe is fixedly connected to one side of the bottom of the water press base, and a drain sleeve is fixedly connected through the other side of the bottom of the water press base. The inner wall of the drain sleeve is rotatably connected to the outer wall of the polishing brush.

[0013] Preferably, the polishing brush has a hollow structure. The bottom end of the polishing brush extends through the inner wall of the liquid storage seat to the outside and is fixedly connected to a motor B. The motor B is fixedly connected to the liquid storage seat. A water guide port is opened on the outer wall of the polishing brush inside the drainage sleeve. Multiple water spray holes are opened on the upper outer wall of the polishing brush. A transmission pipe is fixedly connected to the outer wall of one end of the polishing brush inside the water guide sealing seat. The outer wall of the transmission pipe has an inclined structure and an annular groove. The bristles of the polishing brush are in frictional contact with the inner wall of the inner hole on the mold body. A driving wheel is fixedly connected to the polishing brush near the driven wheel. The driving wheel and the driven wheel are meshed and driven.

[0014] Preferably, a sealing ring is slidably fitted on the inner wall of the upper end of the water-guiding sealing seat, and a plurality of springs are fixedly connected to the bottom end of the sealing ring. The other end of the springs is fixedly connected to the inner wall of the water-guiding sealing seat, and a rubber pad is fixedly connected to the top end of the sealing ring. The top end of the sealing ring abuts against the lower surface of the mold body.

[0015] Preferably, the inner keyway polishing mechanism includes a sliding rod. The bottom end of the sliding rod is slidably engaged with the water-guiding sealing seat and the liquid storage seat. A guide rod is fixedly connected to the side of the sliding rod near the bottom end. One end of the guide rod is slidably engaged with the inner wall of the annular groove. The end of the sliding rod located in the liquid storage seat is fixedly connected to the piston rod by bolts. Polishing plates are provided on the side wall of the inner keyway on the mold body facing the sliding rod. A guide wedge is fixedly connected to the top of the polishing plate. Two T-heads are fixedly connected to the side of the polishing plate near the sliding rod. The T-heads are slidably engaged with the inner wall of the sliding rod. A tension spring is fixedly connected between the T-heads and the inner wall of the sliding rod. One side of the polishing plate is in frictional contact with the inner wall of the inner keyway on the mold body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up an internal keyway polishing mechanism and polishing brush, while the polishing brush rotates to polish the inner hole of the mold, it can drive multiple polishing plates that are in contact with the internal keyway to move up and down reciprocally, so as to achieve precise polishing of the keyway part, ensure the integrity and uniformity of the polishing process, avoid the problem of insufficient or uneven polishing of the keyway area in traditional methods, significantly improve the polishing quality and efficiency of keyway inner holes, ensure uniform surface finish, improve the performance of the mold, extend the mold life, and has broad application prospects. 2. By setting a water pressure seat, the piston rod can be driven to move up and down while polishing on the polishing plate. This allows the cooling liquid in the reservoir to be injected into the polishing brush and sprayed out. When polishing the inner hole of the mold, it can effectively improve the temperature control, lubrication, and cleaning functions during the polishing process, thereby improving the polishing quality, reducing tool wear, increasing work efficiency, and having good environmental adaptability. It can not only ensure the smoothness of the inner hole of the mold during the polishing process, but also effectively extend the service life of tools and molds, and improve the stability and reliability of the entire processing system. 3. By setting up a water-guiding sealing seat, rubber cover and filter mechanism, the water-guiding sealing seat and rubber cover can block the openings on both sides of the mold inner hole, effectively preventing coolant leakage, avoiding coolant spillage, keeping the working area clean and reducing the burden of cleaning work. At the same time, when the polishing brush rotates for polishing, it can drive the filter tube to rotate, which can not only efficiently collect and filter coolant, but also realize its reuse, greatly reducing coolant consumption and production costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an inner hole polishing fixture for mold production according to the present invention; Figure 2 This is a partial cross-sectional view of the overall structure of an inner hole polishing fixture for mold production according to the present invention. Figure 3 This is a schematic diagram showing the unfolded structure of the base of an inner hole polishing fixture for mold production according to the present invention. Figure 4 This is a schematic diagram of the rotating frame structure of an inner hole polishing fixture for mold production according to the present invention; Figure 5 This is a partial cross-sectional view of the liquid storage seat and filter mechanism of an inner hole polishing fixture for mold production according to the present invention. Figure 6 This is a partial cross-sectional schematic diagram of the water pressure seat and water guide sealing seat structure of an inner hole polishing fixture for mold production according to the present invention. Figure 7 This is a schematic diagram of the polishing brush structure of an inner hole polishing fixture for mold production according to the present invention; Figure 8 This is a schematic diagram showing the internal keyway polishing mechanism of an internal hole polishing fixture for mold production according to the present invention.

[0018] The following are marked in the diagram: 1. Base; 2. Rotating frame; 3. Liquid reservoir; 4. Filter mechanism; 5. Water pressure seat; 6. Polishing brush; 7. Water guide sealing seat; 8. Internal keyway polishing mechanism; 101. Positioning block; 102. Mold body; 103. Electric actuator A; 104. Rubber cover; 201. Motor A; 202. Electric actuator B; 301. Valve; 401. Liquid guide tube; 402. Transmission rod; 403. Driven wheel ; 404, transmission sleeve; 405, filter tube; 406, connecting plug; 501, piston rod; 502, water inlet pipe; 503, drain sleeve; 601, motor B; 602, transmission pipe; 603, annular groove; 604, drive wheel; 701, sealing ring; 702, spring; 801, sliding rod; 802, guide rod; 803, polishing plate; 804, guide wedge; 805, T-head; 806, tension spring. Detailed Implementation

[0019] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0020] like Figures 1-8 The tooling for polishing inner holes in mold production shown includes a base 1, a rotating frame 2 rotatably connected inside the base 1, a liquid storage seat 3 above the rotating frame 2, a filter mechanism 4 fixedly connected inside the liquid storage seat 3, a water pressure seat 5 fixedly connected inside the liquid storage seat 3, a polishing brush 6 rotatably connected through the liquid storage seat 3, a water guiding sealing seat 7 fixedly connected to the top of the liquid storage seat 3, and an inner hole keyway polishing mechanism 8 slidably fitted inside the water guiding sealing seat 7.

[0021] like Figure 3As shown, multiple positioning blocks 101 are fixedly connected to the inner wall of the upper end of the base 1. A mold body 102 is set above the base 1. The four corners of the mold body 102 are adapted to the positioning blocks 101. Multiple electric push rods A103 are fixedly connected to the top of the base 1. A rubber cover 104 is fixedly connected to the output end of the electric push rod A103. The bottom end of the rubber cover 104 abuts against the upper surface of the mold body 102.

[0022] like Figure 4 As shown, a motor A201 is fixedly connected to the middle of the rotating frame 2, which extends through the inner wall of the base 1 to the outside. The motor A201 is fixedly connected to the base 1. An electric actuator B202 is fixedly connected to one end of the rotating frame 2. The output end of the electric actuator B202 is fixedly connected to the liquid storage seat 3.

[0023] like Figure 5 As shown, a valve 301 is fixedly connected to the bottom opening of the liquid reservoir 3, and a liquid filling port is provided on one side of the top of the liquid reservoir 3. The valve 301 can discharge the coolant.

[0024] like Figure 5 As shown, the filtration mechanism 4 includes a liquid guide tube 401. One end of the liquid guide tube 401 is fixedly connected to the liquid storage seat 3 and the water-conducting sealing seat 7. The other end of the liquid guide tube 401 is fixedly connected to the liquid storage seat 3. A transmission rod 402 is rotatably connected inside the liquid guide tube 401. A driven wheel 403 is fixedly connected to the outer end of the transmission rod 402. A transmission sleeve 404 is slidably fitted to the inner end of the transmission rod 402. A filter tube 405 is fixedly connected to one end of the transmission sleeve 404. A connecting plug 406 is rotatably connected to one end of the filter tube 405. The connecting plug 406 is threadedly connected to one end of the liquid guide tube 401. When the polishing brush 6 rotates, it drives the driving wheel 604 to rotate, which in turn drives the transmission rod 402 connected to the driven wheel 403 to rotate. This causes the transmission rod 402 to drive the filter tube 405 connected to the transmission sleeve 404 to rotate.

[0025] like Figure 6 As shown, a piston rod 501 is slidably fitted through the inner wall of the top of the water pressure base 5. A water inlet pipe 502 is fixedly connected to one side of the bottom of the water pressure base 5, and a drain sleeve 503 is fixedly connected through the other side of the bottom of the water pressure base 5. The inner wall of the drain sleeve 503 is rotatably connected to the outer wall of the polishing brush 6. A one-way valve is installed inside both the water inlet pipe 502 and the drain sleeve 503.

[0026] like Figure 7As shown, the polishing brush 6 has a hollow structure. The bottom end of the polishing brush 6 extends through the inner wall of the liquid storage base 3 to the outside and is fixedly connected to the motor B601. The motor B601 is fixedly connected to the liquid storage base 3. The outer wall of the polishing brush 6 located inside the drainage sleeve 503 has a water guide port. The upper outer wall of the polishing brush 6 has multiple water spray holes. The outer wall of the polishing brush 6 located inside the water guide sealing seat 7 is fixedly connected to the transmission pipe 602. The outer wall of the transmission pipe 602 has an inclined structure and an annular groove 603. The bristles of the polishing brush 6 are in frictional contact with the inner wall of the inner hole on the mold body 102. The driving wheel 604 is fixedly connected to the polishing brush 6 near the driven wheel 403. The driving wheel 604 and the driven wheel 403 are meshed and driven. The motor B601 can drive the connected polishing brush 6 to rotate and polish the inner hole. At the same time, the polishing brush 6 will drive the transmission tube 602 to rotate. At this time, the annular groove 603 on the transmission tube 602 will drive the sliding rod 801 connected to the guide rod 802 to move up and down.

[0027] like Figure 6 As shown, a sealing ring 701 is slidably fitted on the inner wall of the upper end of the water-guiding sealing seat 7. Multiple springs 702 are fixedly connected to the bottom end of the sealing ring 701. The other end of the springs 702 is fixedly connected to the inner wall of the water-guiding sealing seat 7. A rubber pad is fixedly connected to the top end of the sealing ring 701. The top end of the sealing ring 701 abuts against the lower surface of the mold body 102.

[0028] like Figure 8 As shown, the inner keyway polishing mechanism 8 includes a sliding rod 801. The bottom end of the sliding rod 801 is slidably connected to the water-conducting sealing seat 7 and the liquid storage seat 3. A guide rod 802 is fixedly connected to the side of the sliding rod 801 near the bottom end. One end of the guide rod 802 is slidably connected to the inner wall of the annular groove 603. The end of the sliding rod 801 located in the liquid storage seat 3 is fixedly connected to the piston rod 501 by bolts. Polishing plates 803 are provided on the side wall of the inner keyway on the mold body 102 facing the sliding rod 801. A guide inclined block 804 is fixedly connected to the top of the polishing plate 803. Two T-heads 805 are fixedly connected to the side of the polishing plate 803 near the sliding rod 801. The T-heads 805 are slidably connected to the inner wall of the sliding rod 801. A tension spring 806 is fixedly connected between the T-heads 805 and the inner wall of the sliding rod 801. One side of the polishing plate 803 is in frictional contact with the inner wall of the inner keyway on the mold body 102. When the sliding rod 801 moves up and down, it drives the connected piston rod 501 to move up and down. At this time, the coolant in the reservoir 3 is drawn into the pressure water seat 5 through the water inlet pipe 502, and then injected into the polishing brush 6 through the drain sleeve 503. The guide wedge 804 makes it easier for the polishing plate 803 to be inserted into the keyway.

[0029] By setting up an internal keyway polishing mechanism 8 and a polishing brush 6, while the polishing brush 6 rotates to polish the inner hole of the mold, it can drive multiple polishing plates 803 that are in contact with the internal keyway to move up and down reciprocally, thereby achieving precise polishing of the keyway part. This ensures the integrity and uniformity of the polishing process, avoids the problem of insufficient or uneven polishing of the keyway area in traditional methods, and can significantly improve the polishing quality and efficiency of keyway inner holes. At the same time, it ensures uniform surface finish, improves the performance of the mold, and extends the mold life, which has broad application prospects.

[0030] Working principle: When it is necessary to polish the inner hole with keyway on the mold body 102, the mold body 102 is first placed between multiple positioning blocks 101 for positioning, and then the electric push rod A103 is used to drive the connected rubber cover 104 to move down and cover the inner hole of the mold body 102. Then, the motor A201 drives the rotating frame 2 to rotate, so that the polishing brush 6 and the inner hole keyway polishing mechanism 8 are aligned with the inner hole. Then, the electric push rod B202 drives the liquid storage seat 3 to move upward, so that the polishing brush 6 and the inner hole keyway polishing mechanism 8 are inserted into the inner hole. At this time, under the action of the tension spring 806, the polishing plate 803 can be tightly attached to the inner wall of the keyway of the inner hole. At the same time, under the action of the spring 702, the sealing ring 701 will abut against the lower opening of the inner hole. Then, the motor B601 can drive the connected polishing brush 6 to rotate and polish the inner hole. At the same time, the polishing brush 6 will drive the transmission tube 602 to rotate. At this time, the annular groove 603 on the transmission tube 602 will drive the sliding rod 801 connected to the guide rod 802 to move up and down. This will cause multiple polishing plates 803 to polish the inner wall of the keyway of the inner hole. At the same time, when the sliding rod 801 moves up and down, it will drive the connected piston rod 501 to move up and down. At this time, the coolant in the reservoir 3 will be drawn into the pressure water seat 5 through the water inlet pipe 502, and then injected into the polishing brush 6 through the drain sleeve 503. It will be sprayed out through the water spray hole on the polishing brush 6 to cool and clean the polishing position. The used coolant is then injected into the filter tube 405 through the liquid guide tube 401. When the polishing brush 6 rotates, it drives the drive wheel 604 to rotate, which in turn drives the transmission rod 402 connected to the driven wheel 403 to rotate. This causes the transmission rod 402 to drive the filter tube 405 connected to the transmission sleeve 404 to rotate, thus filtering the used coolant. When the filter tube 405 needs to be cleaned, it can be removed from the liquid guide tube 401 for cleaning by rotating the connecting plug 406.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A tooling for polishing inner holes in mold production, comprising a base (1), characterized in that: A rotating frame (2) is rotatably connected inside the base (1). A liquid storage seat (3) is provided above the rotating frame (2). A filter mechanism (4) is fixedly connected inside the liquid storage seat (3). A water pressure seat (5) is fixedly connected inside the liquid storage seat (3). A polishing brush (6) is rotatably connected through the liquid storage seat (3). A water guiding sealing seat (7) is fixedly connected to the top of the liquid storage seat (3). An inner hole keyway polishing mechanism (8) is slidably fitted inside the water guiding sealing seat (7).

2. The inner hole polishing fixture for mold production according to claim 1, characterized in that: Multiple positioning blocks (101) are fixedly connected to the inner wall of the upper end of the base (1). A mold body (102) is set above the base (1). The four corners of the mold body (102) are adapted to the positioning blocks (101). Multiple electric push rods A (103) are fixedly connected to the top of the base (1). A rubber cover (104) is fixedly connected to the output end of the electric push rod A (103). The bottom end of the rubber cover (104) abuts against the upper surface of the mold body (102).

3. The inner hole polishing fixture for mold production according to claim 2, characterized in that: The rotating frame (2) extends through the inner wall of the base (1) to the outside and is fixedly connected to a motor A (201). The motor A (201) is fixedly connected to the base (1). One end of the rotating frame (2) is fixedly connected to an electric push rod B (202). The output end of the electric push rod B (202) is fixedly connected to the liquid storage seat (3).

4. The inner hole polishing fixture for mold production according to claim 1, characterized in that: A valve (301) is fixedly connected to the bottom opening of the liquid storage seat (3), and a liquid filling port is opened on one side of the top of the liquid storage seat (3).

5. The inner hole polishing fixture for mold production according to claim 3, characterized in that: The filtration mechanism (4) includes a liquid guide tube (401). One end of the liquid guide tube (401) is fixedly connected to the liquid storage seat (3) and the water guide sealing seat (7). The other end of the liquid guide tube (401) is fixedly connected to the liquid storage seat (3). A transmission rod (402) is rotatably connected inside the liquid guide tube (401). A driven wheel (403) is fixedly connected to the outer end of the transmission rod (402). A transmission sleeve (404) is slidably fitted to the inner end of the transmission rod (402). A filter tube (405) is fixedly connected to one end of the transmission sleeve (404). A connecting plug (406) is rotatably connected to one end of the filter tube (405). The connecting plug (406) is threadedly connected to one end of the liquid guide tube (401).

6. The inner hole polishing fixture for mold production according to claim 5, characterized in that: A piston rod (501) is slidably fitted through the inner wall of the top of the water press base (5). A water inlet pipe (502) is fixedly connected to one side of the bottom of the water press base (5). A drain sleeve (503) is fixedly connected through the other side of the bottom of the water press base (5). The inner wall of the drain sleeve (503) is rotatably connected to the outer wall of the polishing brush (6).

7. The inner hole polishing fixture for mold production according to claim 6, characterized in that: The polishing brush (6) is hollow. The bottom end of the polishing brush (6) extends through the inner wall of the liquid storage seat (3) to the outside and is fixedly connected to a motor B (601). The motor B (601) is fixedly connected to the liquid storage seat (3). The outer wall of the polishing brush (6) located in the drain sleeve (503) has a water guide port. The upper outer wall of the polishing brush (6) has multiple water spray holes. The outer wall of the polishing brush (6) located in the water guide sealing seat (7) is fixedly connected to a transmission pipe (602). The outer wall of the transmission pipe (602) is inclined and has an annular groove (603). The bristles of the polishing brush (6) are in frictional contact with the inner wall of the inner hole on the mold body (102). The polishing brush (6) is fixedly connected to a drive wheel (604) near the driven wheel (403). The drive wheel (604) and the driven wheel (403) are meshed and driven.

8. The inner hole polishing fixture for mold production according to claim 7, characterized in that: A sealing ring (701) is slidably fitted on the inner wall of the upper end of the water-guiding sealing seat (7). A plurality of springs (702) are fixedly connected to the bottom end of the sealing ring (701). The other end of the springs (702) is fixedly connected to the inner wall of the water-guiding sealing seat (7). A rubber pad is fixedly connected to the top end of the sealing ring (701). The top end of the sealing ring (701) abuts against the lower surface of the mold body (102).

9. The inner hole polishing fixture for mold production according to claim 8, characterized in that: The inner hole keyway polishing mechanism (8) includes a sliding rod (801). The bottom end of the sliding rod (801) is slidably connected to the water guide sealing seat (7) and the liquid storage seat (3). A guide rod (802) is fixedly connected to the side of the sliding rod (801) near the bottom end. One end of the guide rod (802) is slidably connected to the inner wall of the annular groove (603). The end of the sliding rod (801) located in the liquid storage seat (3) is fixedly connected to the piston rod (501) by bolts. The sliding rod (801) faces the inner hole keyway on the mold body (102). Polishing plates (803) are provided on the side walls of the groove. A guide block (804) is fixedly connected to the top of the polishing plate (803). Two T-heads (805) are fixedly connected to the side of the polishing plate (803) near the sliding rod (801). The T-heads (805) are slidably engaged with the inner wall of the sliding rod (801). A tension spring (806) is fixedly connected between the T-heads (805) and the inner wall of the sliding rod (801). One side of the polishing plate (803) is in frictional contact with the inner wall of the keyway on the mold body (102).

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