CN215750248U - Guide block externally coated with polytetrafluoroethylene film and forming die thereof - Google Patents
Guide block externally coated with polytetrafluoroethylene film and forming die thereof Download PDFInfo
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- CN215750248U CN215750248U CN202122029598.5U CN202122029598U CN215750248U CN 215750248 U CN215750248 U CN 215750248U CN 202122029598 U CN202122029598 U CN 202122029598U CN 215750248 U CN215750248 U CN 215750248U
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- guide block
- boss
- polytetrafluoroethylene film
- polytetrafluoroethylene
- membrane
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Abstract
The utility model relates to a guide block externally coated with a polytetrafluoroethylene film and a forming die thereof, wherein the guide block is a rubber guide block, the top of the guide block is provided with a strip-shaped boss, and the periphery of the boss is a plane lower than the boss; the top surface of the boss is provided with a polytetrafluoroethylene film which extends to the edge of the plane below the boss, and the vertical section is shaped like a Chinese character ji. The guide block has good appearance quality, stable product size and good antifriction effect, and the polytetrafluoroethylene film is not easy to form edges, so that the sliding surface is effectively protected; the forming die is convenient to install and simple to operate, and meets the requirement on the compression modulus of the product.
Description
Technical Field
The utility model relates to a rubber guide block, in particular to a guide block externally coated with a polytetrafluoroethylene film and a forming die thereof.
Background
The guide block made of rubber materials is a general equipment structure, is widely applied in the field of aerospace, is mainly used for limiting and guiding directional movement of parts, and is generally provided with a strip-shaped boss at the top.
At present, a polytetrafluoroethylene film is arranged on a sliding friction surface at the top of a boss of a rubber guide block structure, and the polytetrafluoroethylene film has the characteristics of low friction coefficient and strong high-temperature stability, and is very suitable for being arranged on the sliding friction surface at the top of the boss of the rubber guide block. However, the polytetrafluoroethylene film only covers the whole plane of the boss, the edge of the polytetrafluoroethylene film is collinear with the edge of the boss, and with the long-term use of the guide block, frequent sliding friction can cause the edge of the polytetrafluoroethylene film to be turned up, namely, the edge is turned up, so that the normal use of the guide block is influenced, the service life of the guide block is shortened, and even serious safety accidents can be caused.
Disclosure of Invention
The utility model aims to provide a guide block externally coated with a polytetrafluoroethylene film and a forming die thereof, which solve the technical problem of edge rising of the polytetrafluoroethylene film and prolong the service life of the guide block.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a kind of guide block coated with polytetrafluoroethylene membrane, characterized by that:
the guide block is a rubber guide block, a strip-shaped boss is arranged at the top of the guide block, and the periphery of the boss is a plane lower than the boss;
the top surface of the boss is provided with a polytetrafluoroethylene film which extends to the edge of the plane below the boss, and the vertical section is shaped like a Chinese character ji.
The polytetrafluoroethylene membrane extends to the side of boss along longitudinal direction, and the plane edge of boss below is including top membrane portion, the side membrane portion of top membrane portion longitudinal direction both sides and the bottom membrane portion of side membrane portion longitudinal direction outside.
The polytetrafluoroethylene membrane transversely extends to the side of boss, and up to the plane edge of boss below, including top membrane portion, the side membrane portion of top membrane portion longitudinal both sides and the bottom membrane portion of side membrane portion longitudinal outside.
The polytetrafluoroethylene film extends to the side face of the boss along the transverse direction and the longitudinal direction until the edge of the plane below the boss, and covers the top face, the side face and the plane below the boss, and comprises a top film part, side film parts on the two longitudinal sides of the top film part and a bottom film part on the outer longitudinal side of the side film part.
The two transverse sides of the bottom of the rubber guide block are contracted and narrowed from top to bottom, the left transition surface is a plane, and the right transition surface is a curved surface.
The manufacturing of the guide block forming die externally coated with the polytetrafluoroethylene film is characterized in that:
the forming die comprises a shaping tool for pre-shaping the polytetrafluoroethylene film and a positioning tool for externally covering the polytetrafluoroethylene film on the rubber guide block;
the shaping tool comprises a shaping upper die and a shaping lower die, wherein the center of the shaping lower die is provided with a sunken groove with the shape consistent with that of the boss in the rubber guide block, and the shaping upper die is provided with a bulge matched with the shape of the sunken groove;
the positioning tool comprises a positioning upper die and a positioning lower die, wherein the center of the positioning lower die is provided with a sunken groove which has the same shape with a boss in the rubber guide block, and the positioning upper die is provided with a sunken groove which is matched with the bottom shape of the rubber guide block.
The periphery of the sunken groove of the lower shaping die is provided with a ring groove, and a compression ring for pressing and covering the polytetrafluoroethylene film is arranged in the ring groove.
Compared with the prior art, the utility model has the following beneficial effects:
the guide block has the advantages of good appearance quality, stable product size and good antifriction effect, and the polytetrafluoroethylene film is not easy to form edges, so that the sliding surface is effectively protected. The forming die is convenient to install and simple to operate, and meets the requirement on the compression modulus of the product.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.
Fig. 1 is a plan view of a rubber guide block.
FIG. 2 is a side view of a guide block coated with a polytetrafluoroethylene film.
FIG. 3 is a cross-sectional view of a guide block coated with a polytetrafluoroethylene film.
Fig. 4 is a cross-sectional view of the sizing tool.
Fig. 5 is a plan view of the sizing cope mold.
FIG. 6 is a cross-sectional view of the membrane in position.
Fig. 7 is a plan view of the lower membrane in position.
Fig. 8 is a plan view of the membrane in position.
The labels in the figure are:
1-rubber guide block, 2-boss, 3-polytetrafluoroethylene film, 4-top film part, 5-side film part, 6-bottom film part, 7-shaping upper die, 8-shaping lower die, 9-pressing ring, 10-positioning lower die and 11-positioning upper die.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The guide block externally coated with the polytetrafluoroethylene film is a rubber guide block 1, as shown in figure 1, the top of the guide block is provided with a strip-shaped boss 2, and the periphery of the boss 2 is a plane lower than the boss 2. As shown in fig. 3, the two transverse sides of the bottom part of the utility model are contracted and narrowed from top to bottom, the left transition surface is a plane, and the right transition surface is a curved surface. Referring to fig. 3, a polytetrafluoroethylene film 3 is arranged on the top surface of the boss 2, the polytetrafluoroethylene film 3 extends to the edge of the plane below the boss 2, and the vertical section is shaped like a Chinese character ji.
As can be seen from fig. 2 and 3, the ptfe film 3 may extend in one direction, longitudinally to the side of the boss 2, and up to the edge of the plane below the boss 2, and includes a top film portion 4, side film portions 5 at both sides of the top film portion 4 in the longitudinal direction, and a bottom film portion 6 at the outer side of the side film portions 5 in the longitudinal direction. In the technical scheme of the utility model, the scheme of transverse extension and bidirectional extension of the polytetrafluoroethylene membrane 3 can also be adopted and selected according to the actual working condition.
The forming die for manufacturing the outer-coating polytetrafluoroethylene film guide block comprises a shaping tool for pre-shaping the polytetrafluoroethylene film 3 and a positioning tool for coating the polytetrafluoroethylene film 3 on the rubber guide block 1.
Referring to fig. 4 and 5, the setting tool includes a setting upper die 7 and a setting lower die 8, the setting lower die 8 has a depressed groove in the center thereof, the depressed groove having a shape corresponding to the shape of the boss 2 of the rubber guide block 1, and the setting upper die 7 has a projection matching the shape of the depressed groove. The polytetrafluoroethylene membrane 3 can be pre-shaped by utilizing a shaping tool consisting of a bottom die 8 and a shaping upper die 7.
As shown in fig. 6, 7 and 8, the positioning tool comprises a positioning upper die 11 and a positioning lower die 10, wherein the center of the positioning lower die 10 is provided with a sunken groove which is consistent with the shape of the boss 2 in the rubber guide block 1, and the positioning upper die 11 is provided with a sunken groove which is matched with the bottom shape of the rubber guide block 1.
As shown in fig. 6, the periphery of the sunken groove of the lower shaping mold 8 is provided with a ring groove, and a press ring 9 for pressing and covering the polytetrafluoroethylene film 3 is arranged in the ring groove.
The specific preparation process of the utility model is as follows:
the method comprises the following steps: preparation of semi-finished product
And pressing the rubber material on a double-roller open mill into rubber sheets with required thickness, and then cutting the semi-finished products according to the size of the cavity for later use.
Step two: polytetrafluoroethylene membrane treatment
Cutting a black polytetrafluoroethylene membrane with the size of (80-100) mmX (29-30) mmX (0.5 +/-0.02) mm or (145-150) mmX (29-30) mmX (0.5 +/-0.02) mm, wherein the size is determined according to customization requirements, and the redundant part can be cut off finally; the lexan is uniformly coated on the surface of the polytetrafluoroethylene film (the lexan is prevented from being coated too thickly), and the lexan is used after being dried, so that the lexan is prevented from losing efficacy after being used every other day.
Step three: vulcanization
1. Preparation before vulcanization:
1) placing the prepared semi-finished product into a cavity of a positioning tool, preheating for thirty seconds, pressing to 5Mpa, removing the excess glue amount after shaping is finished, and taking out the shaped glue block for later use;
2) presetting the dried polytetrafluoroethylene membrane by using a setting tool, wherein the pressure is not more than 5Mpa, and the polytetrafluoroethylene membrane cannot be crushed or folded;
3) the mold is cleaned and preheated.
2. And (3) vulcanization operation:
1) placing the prepared semi-finished product into a cavity of a positioning tool, preheating for thirty seconds, pressing to 15Mpa, removing the excess glue after shaping is finished, and taking out the shaped glue block for later use;
2) the shaped polytetrafluoroethylene film is placed into a positioning lower die (the side of the coated Teflon film faces upwards), and is fixed by a pressing ring, so that the pressing is not over-tight, and the phenomenon of crushing during glue filling and vulcanization is avoided;
3) placing the shaped rubber block in a cavity, covering a positioning upper die, slowly closing the die, pressing and vulcanizing, wherein the specific vulcanization conditions are as follows;
the vulcanization temperature is (160 +/-5) DEG C
The vulcanization pressure is (11-15) MPa
The vulcanization time is (30 +/-1) min
4) When the product is taken out, the mold is opened, care is needed, and when the product is taken out, a yellow film is attached to the polytetrafluoroethylene film for protection, so that the polytetrafluoroethylene surface is prevented from being scratched.
The product related to the utility model has excellent antifriction performance (the sliding friction coefficient of the surface of the guide block bonded with the polytetrafluoroethylene film is not more than 0.04); a higher compression modulus (the surface can bear the pressure of no less than 15000N, and the deformation is 0.6-1 mm under the action of 10000N normal pressure); the molding method ensures that the bonding strength of the rubber and the polytetrafluoroethylene film meets the index requirement; the polytetrafluoroethylene film layer adopts a full-covering polytetrafluoroethylene mechanism, so that the end surface debonding phenomenon in the sliding friction process is avoided, and the service life is prolonged; the product has novel structural design, attractive appearance, convenient installation and good use effect.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the utility model and are not intended to be limiting. For a person skilled in the art to which the utility model pertains, several simple deductions, modifications or substitutions may be made according to the idea of the utility model.
Claims (7)
1. A kind of guide block coated with polytetrafluoroethylene membrane, characterized by that:
the guide block is a rubber guide block (1), a strip-shaped boss (2) is arranged at the top of the guide block, and the periphery of the boss (2) is a plane lower than the boss (2);
the top surface of the boss (2) is provided with a polytetrafluoroethylene film (3), the polytetrafluoroethylene film (3) extends to the plane edge below the boss (2), and the vertical section is in a shape like a Chinese character ji.
2. A guide block of an overcoated polytetrafluoroethylene film according to claim 1, wherein:
the polytetrafluoroethylene membrane (3) longitudinally extends to the side face of the boss (2) until the plane edge below the boss (2), and comprises a top membrane part (4), side membrane parts (5) on two longitudinal sides of the top membrane part (4), and a bottom membrane part (6) on the longitudinal outer side of the side membrane parts (5).
3. A guide block of an overcoated polytetrafluoroethylene film according to claim 1, wherein:
the polytetrafluoroethylene membrane (3) transversely extends to the side face of the boss (2) until the plane edge below the boss (2), and comprises a top membrane part (4), side membrane parts (5) on two longitudinal sides of the top membrane part (4), and a bottom membrane part (6) on the longitudinal outer side of the side membrane parts (5).
4. A guide block of an overcoated polytetrafluoroethylene film according to claim 1, wherein:
the polytetrafluoroethylene film (3) extends to the side face of the boss (2) along the transverse direction and the longitudinal direction until the plane edge below the boss (2) covers the top face, the side face and the plane below the boss (2) of the whole boss, and comprises a top film part (4), side film parts (5) on the two longitudinal sides of the top film part (4) and a bottom film part (6) on the longitudinal outer side of the side film parts (5).
5. A guide block overcoated with a polytetrafluoroethylene film according to claim 2, 3 or 4 wherein:
the two transverse sides of the bottom of the rubber guide block (1) are contracted and narrowed from top to bottom, the left transition surface is a plane, and the right transition surface is a curved surface.
6. The forming die for the guide block coated with the polytetrafluoroethylene film, which is disclosed by claim 5, is characterized in that:
the forming die comprises a shaping tool for pre-shaping the polytetrafluoroethylene film (3) and a positioning tool for externally covering the polytetrafluoroethylene film (3) on the rubber guide block (1);
the shaping tool comprises an upper shaping die (7) and a lower shaping die (8), wherein the center of the lower shaping die (8) is provided with a sunken groove which is consistent with the shape of the boss (2) in the rubber guide block (1), and the upper shaping die (7) is provided with a bulge matched with the shape of the sunken groove;
the positioning tool comprises a positioning upper die (11) and a positioning lower die (10), wherein the center of the positioning lower die (10) is provided with a sunken groove which is consistent with the shape of the boss (2) in the rubber guide block (1), and the positioning upper die (11) is provided with a sunken groove which is matched with the shape of the bottom of the rubber guide block (1).
7. The guide block forming die externally coated with a polytetrafluoroethylene film according to claim 6, wherein:
an annular groove is arranged on the periphery of the sunken groove of the lower shaping die (8), and a pressing ring (9) for pressing and covering the polytetrafluoroethylene film (3) is arranged in the annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122029598.5U CN215750248U (en) | 2021-08-26 | 2021-08-26 | Guide block externally coated with polytetrafluoroethylene film and forming die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122029598.5U CN215750248U (en) | 2021-08-26 | 2021-08-26 | Guide block externally coated with polytetrafluoroethylene film and forming die thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215750248U true CN215750248U (en) | 2022-02-08 |
Family
ID=80078742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122029598.5U Active CN215750248U (en) | 2021-08-26 | 2021-08-26 | Guide block externally coated with polytetrafluoroethylene film and forming die thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215750248U (en) |
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2021
- 2021-08-26 CN CN202122029598.5U patent/CN215750248U/en active Active
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