KR20010014022A - Tire mold reinforcement - Google Patents

Abstract

Making a tire mold having a plurality of complete tire mold segments (20) of epoxy resin mold material formed in the chambers (18) of segmental shoes (10) and having reinforced stand alone ribs (56) formed in recesses in the tread models mounted in the shoes. The shoes (10) and models (50) are reusable and have standard shoe split diameters and chord lengths to reduce the time necessary to make the molds. The models (50) are of resilient material and are also reusable.

Description

Reinforced independent rib manufacturing method and split shoe for tire mold and tire mold molding {TIRE MOLD REINFORCEMENT}

As disclosed in US Pat. No. 4,858,881, it has been proposed to make partial tire molds of epoxy or other resin to repair tire sidewalls. It has also been proposed to reinforce plastic products with glass fibers as disclosed in US Pat. No. 4,692,291. US Pat. No. 5,449,483 uses a modular shoe container to make a metal shell with resin backing.

U.S. Patent No. 2,275,582 discloses moving a metal blade from a slit in a rubber matrix to a mold shell. This matrix is covered with an electron-molded metal shell bonded to the blade such that the blade becomes part of the metal mold shell upon removal of the matrix. The metal shells must then be machined to become part of the tire mold.

Disclosure of the Invention

According to the method of the invention, a model of a tire segment having a tread structure with recesses such as grooves, slots and slits on its surface is mounted in a shoe having a chamber for receiving plastic such as uncured liquid epoxy resin, Form a complete segment of the mold. Prior to filling the chamber with an uncured epoxy resin, a grease-type release agent is injected into the model that does not react with the epoxy resin that delays curing.

According to one embodiment of the invention, after curing and separation of the mold from the model, a mixture of glass fiber and epoxy is sprayed into the recess of the model surface on the surface of the model, so as to be independent ribs reinforced in the tread forming surface of the epoxy resin mold. To provide. According to another embodiment, a mixture of uncured epoxy resin and glass fibers is formed to a semi-liquid putty-like consistency, and instead of spraying, the material is pressed against the surface of the model to harden the surface of the model. Charge the recess. After filling the recess by pressing and solidifying the mixture of epoxy resin and fiberglass and waiting for its hardening, the uncured glass epoxy resin mold material is poured into the chamber of the shoe to completely fill the chamber in the shoe to form a complete mold segment. This liquid epoxy resin mold material is then cured.

In another embodiment, a slurry of liquid epoxy resin and fiberglass is poured directly onto the model and the chamber is filled, and then pressure is applied to pressurize the slurry into recesses in the model surface and form independent ribs on the model surface.

In another embodiment, a single or stacked metal blade is inserted into the slit of the model after the separator is sprayed into the model. The blade may be attached to the model with a suitable adhesive to bond the metal to the elastomeric material. The model is mounted in a shoe container and filled with a liquid epoxy resin mold material bonded to the surface of the blade. The epoxy resin mold material is cured and then cooled. When the model is removed, the solidified epoxy resin mold material contained in the shoe is separated from the model. The blades remain in the epoxy tread mold to reinforce the ribs, allowing the ribs to withstand the stresses and deformations from the tire forming process.

The model is preferably a resilient elastomeric material that pours the epoxy resin mold material and then inserts the blade into the slit of the model and facilitates removal of the blade from the slit of the model. The model can then be used again for shaping other tread mold segments.

The process of the present invention provides a portion made of steel or aluminum for making epoxy resin tread mold segments and holding the segments during curing. Different mold sizes were required to make molds of different tire sizes. The parts were prefabricated to produce the mold quickly. According to the present invention, the number of different sized parts was reduced by prefabricating the parts to different sizes using a two-dimensional standard. The one-dimensional dimension standard is the mold split diameter, which is the diameter where the sidewall plates meet the tread segments. Another dimension of standard is the sequence and chord angle of the slide block part used in the mold tool.

The invention also provides a U-shaped cavity with a radial side to facilitate removal of the epoxy mold tread segment from the cavity after curing and to secure the tread segment mold portion without requiring a lip on the edge. You can use the shoe more than once. This is accomplished by providing a seal of the shoe cavity and keeping the model bracket in alignment with the shoe.

According to one embodiment of the invention,

(a) creating a model of elastomeric material having recesses on the surface;

(b) adding a separator to the surface of the model,

A method of manufacturing a standalone rib reinforced in a molding surface of a mold made of an epoxy resin mold material for molding a product having a recess on the surface,

(c) inserting a metal blade into the recess;

(d) placing the model in a shoe container chamber having the shape of a complete mold portion;

(e) filling the shoe container with an epoxy resin mold material to form a complete mold portion;

(f) curing the epoxy mold material in the shoe container while it is curing to form the mold portion;

(g) detaching the mold portion from the model to which the blade is joined to the mold portion and removing it from the recess in the surface of the model. .

According to another embodiment of the present invention,

(a) creating a model of elastomeric material having recesses on the surface;

(b) adding a separator to the surface of the model,

A method of making a standalone rib reinforced in the surface of a plastic mold for molding a product having a recess in the surface,

(c) spraying an uncured epoxy resin molding material containing a reinforcement on the surface to fill the recess;

(d) placing the model in a shoe container chamber having the shape of a complete mold portion;

(e) filling the shoe container chamber with an uncured epoxy resin mold material to form a complete mold portion;

(f) holding the epoxy mold material in the container while the epoxy resin mold material in the container is cured to form the mold portion;

(g) separating the mold portion from the model having an epoxy resin mold material in the recess and withdrawing the mold portion from the recess in the model in the form of independent reinforcing ribs. A rib manufacturing method is provided.

According to another embodiment of the present invention,

(a) creating a model of elastomeric material having recesses on the surface;

(b) adding a separator to the surface of the model,

A method of making a standalone rib reinforced in the surface of a plastic mold for molding a product having a recess in the surface,

(c) pressing and hardening the plastic mold material containing the reinforcement into the recess of the model against the surface;

(d) placing the model in a shoe container chamber having the shape of a complete mold portion;

(e) filling the shoe container with a plastic mold material to form a complete mold portion;

(f) holding the plastic mold material in the container while the plastic mold material in the container is cured;

(g) separating the mold portion from the model with the plastic mold material containing the reinforcement in the recess and withdrawing the mold portion from the recess in the model in the form of independent reinforcement ribs. A reinforced independent rib manufacturing method is provided.

According to another embodiment of the present invention,

(a) a plurality of mold segments of epoxy resin molding material;

(b) each of the segments in a tire mold having a radially inner tread forming surface having ribs for forming recesses in the surface,

(c) the tread forming surface has independent ribs of a mixture of epoxy mold material and reinforcement;

(d) A tire mold is provided, wherein each of the mold segments is completely molded to mold a segment of a tire tread in the tire mold.

According to another embodiment of the present invention,

(a) a plurality of mold segments of epoxy resin molding material;

(b) each of the mold segments has a radially inner tread forming surface to which a metal blade is attached to form a recess in the tire made by the mold;

(c) A tire mold further comprising a metal split shoe surrounding each of said mold segments made of an epoxy resin material,

(d) further comprising a radially extending shoe side plate providing a U-shaped cross section in a radial plane including the axis of the mold, such that, after use of the split shoe, the epoxy mold material is removed from the chamber of the metallic split shoe. A tire mold is provided, characterized in that it has been removed so that the shoe can be used again.

The present invention relates to a method and mold structure for producing a plastic mold such as an epoxy resin. This mode may be made by pouring an uncured liquid plastic epoxy resin onto a model in a divided shoe. In particular, the present invention relates to the molding of an epoxy resin mold for molding a mold having a recess in the tread surface formed by independent ribs on the mold surface. Split shoes may be reusable and prefabricated to standard shoe split diameters and string lengths to shorten the time required to make subsequent molds. Alignment and sealing of the shoe portion are provided.

1 is a plan view of a split shoe for a tire mold employing the present invention

2 is a cross-sectional view taken along line 2-2 of FIG. 1;

3 is a schematic cross-sectional view of a portion of a tire press with split shoes mounted in the press;

4 is a schematic plan view of the split shoe according to FIGS. 1 and 2 assembled to form a 360 ° tread forming surface showing different ZEM angles and circumferential lengths of the segments;

5 is a detailed exploded view of one of the divided shoes shown in FIG. 1;

6 is a cross-sectional view of the model on the central bracket shown in FIG. 6 taken along line 6-6 of FIG. 7 showing the metal braid and strip located in the recess;

7 is a plan view of the model taken along line 7-7 of FIG. 6,

8 is an enlarged plan view of two forms of nested multiple blades for insertion into a recess of a model when the recess is thicker than the thickness of a single blade;

9 is a cross-sectional view of a model embedded in a shoe with an epoxy resin injected under pressure into a recess in the model surface;

10 is a cross-sectional view of the model on a central bracket sprayed with epoxy resin to fill recesses in the model surface;

11 is a cross-sectional view of a model on a center bracket having an epoxy resin.

1 and 2 show a split shoe 10 for a tire mold. This split shoe 10 and eight other shoes are assembled in the tread ring 12 as shown in FIG. Each shoe 10 is composed of a shoe side member 14 connected to an outer tread forming member 16. Split shoe 10 has a chamber 18 that houses a tread mold segment 20 of epoxy mold material having a tread forming surface 22. This split shoe 10 may be mounted in the tire press 24. Part of it is schematically shown in FIG. 3, and is radially movable into and from the forming surface as shown in FIG. 3. Independent rib members such as epoxy ribs and steel blades 26 reinforced by steel strip members 28 extend outward from the tread forming surface 22 to provide larger slots and slits in the tire tread.

Different sized split shoes 10 needed to make tire mold segments 20 in different tire sizes. Pre-manufacturing was therefore necessary, and it is therefore desirable to keep the list of split shoes to a minimum. The number of parts was reduced by prefabricating the shoes to different sizes using two-dimensional standards as shown in FIGS. 2 and 4. One-dimensional standard is the mold split diameter (D). Another dimension of surface is the chord angle A shown in FIGS. 1 and 4. Mold dividing diameters (D) found desirable to reduce the number of split shoes were 19.770 inches (50.216 cm), 20.420 inches (51.87 cm), 21.420 inches (54.41 cm), 21.030 inches (53.42 cm), 22.140 inches (56.24 cm), 22.840 inches (58.01 cm).

As shown in Figure 4, the chord angle and chord sequence found to provide a standardized part and reduce noise due to the arranged mold are as follows.

34.400 degrees

40.000 degrees

45.600 degrees

40.000 degrees

34.400 degrees

40.000 degrees

45.600 degrees

40.000 degrees

40.000 degrees

In FIG. 5, the split shoe 10, end brackets 30, 31, center bracket 34 and end plate 36 are shown in an exploded state. Bolts 38 are provided for screwing into corresponding threaded holes in the split shoe 10, the end bracket 30, the end bracket 31 and the center bracket 34. Bolts 40 are provided for screwing into threaded holes in the end brackets 30, 31 and shoe side members 14. The alignment pin 42 extends into the hole of the shoe side member 14 through the holes of the end brackets 30 and 31. Sealing means, such as an O-ring string material 44 mounted in the O-ring groove 46, provide a seal against the chamber 18 inside the split shoe 10. An inlet hole 48 is provided in the end plate 36 to communicate epoxy or other plastic material in liquid form into the chamber 18.

6 and 7 show a partial view of a split shoe 10 having a model such as a model blank secured to a central bracket 34. The model blank 50 may be made in a plaster back set-up mold, in which the shape of the tire crown is formed by sweeping the plaster back. End brackets 30 and 31 are placed over the central cavity in the plaster bag and the elastomer, such as silicone, is poured into the cavity. The end brackets 30 and 31 are removable to provide a gap for carving the model blank in the shoulder. The model blanks 50 shown in FIGS. 6 and 7 incorporate treaded treads such as slits 52 and wider slots 54 to provide independent ribs within the tread forming surface of the model segment 20. Have

2, 3 and 6, metal blades 26 forming part of the tread forming surface 22 are disposed in the slit 52 of the model blank 50. In addition, a steel strip member 28 is disposed in the slot 54 of the model blank before assembling the split shoe 10. The steel strip member 28 may be bonded with a suitable adhesive to the model blank 50 in the slot 54 to bond the metal to the elastomer. The split shoe chamber 18 is then filled with plastic, such as epoxy, which may contain aluminum pellets, and wait for the epoxy material to cure. In this example, the epoxy tread mold segment 20 is cured at room temperature for 24 hours, followed by 200 ° F (93 ° C), 300 ° F (149 ° C), 400 ° F (205 ° C) for 4-5 hours. Heat to the same higher temperature. The split type shoe 10 is then disassembled and ready to be mounted in the tire press 24 as shown in FIG. 3 with the tread mold segment shown in FIGS. 2 and 3. Pull out the steel blades 26 from the model blank 50 and extend the steel blades 26 into the independent ribs 56 of the tread forming surface 22 as shown in FIG. Pull out from slot 54 in model blank 50 with 56. The adhesive holds the steel strip member 28 in place during the application of the plastic material and the aluminum pellets. After curing, the steel strip member 28 may be pulled out of the model blank 50 and any remaining adhesive removed from the steel strip member. By adding the steel blade 26 and the steel strip member 28, the model blank 50 can be simply used again.

1 and 2, bolts 58, 60 with fastening collars 62, 64 extend through the tread forming member and are embedded in epoxy material 66. As shown in FIG. The side 68 of the chamber 18 may be used to loosen the bolts 58, 60 and remove the epoxy mold 66 from the chamber 18 (therefore reusing the metal parts to make another mold segment). Parallel is preferred.

In Fig. 8, steel blades 26 ', 26 "suitable for filling slits 52 or slots 54 having a similar shape are shown. It can also be stacked to fill a wider slit. However, filling the slot 54 is not always necessary, simply placing the steel strip member 28 in the slot. In that case the member provides sufficient reinforcement for the independent epoxy ribs.

Referring to FIG. 9, the split shoe 68 is assembled with the central bracket 70 and the end brackets 72, 74. The center bracket 70 is equipped with a model blank 76, which has a tread mold slow surface 78 engraved with a recess 80 to form an independent rib. According to this embodiment, an epoxy material comprising a reinforcing material such as cut glass fibers exerts sufficient pressure to communicate into the chamber 82 of the split shoe and pressurize the reinforced epoxy material into the recess 80. . The epoxy is cured in a manner similar to that described above for the embodiment of FIGS. 1-8, in which the model blank 76 may be removed and the split shoe 68 mounted in the tire press.

10 shows that the model blank 84 is mounted on the central bracket 86 and the end brackets 88, 90. In this embodiment, epoxy reinforced material 92 reinforced with a suitable material, such as fiberglass, is sprayed onto the tire mold forming surface under pressure to fill the recess 96 of the model blank 84. Provide independent ribs with material. After applying the reinforced epoxy material 92 to the tread forming surface 94, the central bracket 86 and the end brackets 88, 90 are mounted in the split shoe and the end plates 36 are bolted and sealed, Then, as described above in the embodiment shown in FIG. 9, the chamber 38 is filled and the tread mold segment is completed.

FIG. 11 shows another variation in which the model blank 98 is mounted on the center bracket 100 and the end brackets 102, 104. Thereafter, the recess 106 is filled by pressing and hardening an epoxy containing a reinforcement such as glass fiber cut into the recess 106. Thereafter, the center bracket 100 and the end brackets 102 and 104 are assembled in the mold segment as described above with respect to the embodiment of FIGS. 9 and 10 to complete the tread mold segment.

Claims (25)

(a) creating a model of elastomeric material having recesses on the surface; (b) adding a separator to the surface of the model, A method of manufacturing a standalone rib reinforced in a molding surface of a mold made of an epoxy resin mold material for molding a product having a recess on the surface, (c) inserting a metal blade into the recess; (d) placing the model in a shoe container chamber having the shape of a complete mold portion; (e) filling the shoe container with an uncured epoxy resin mold material to form a complete mold portion; (f) curing the epoxy mold material in the shoe container to form the mold portion; (g) detaching the mold portion from the model to which the blade is bonded to the mold portion and removing it from the recess in the surface of the model. The method of claim 1, Wherein said recess is non-linear and said metal blade is shaped to conform to its non-linear shape. The method of claim 2, And wherein the recess is curved and the blade is curved to fit into the recess. The method of claim 1, The metal blade is adhesively attached to the model to hold the metal blade in place during filling of the shoe container and the adhesive allows the metal blade to be pulled out of the recess during removal of the mold portion from the model. Reinforced independent rib manufacturing method characterized in that the. The method of claim 1, Wherein said metal blade comprises a laminated metal sheet having a lamination thickness equal to the width of said recess. (a) creating a model of elastomeric material having recesses on the surface; (b) adding a separator to the surface of the model, A method of making a standalone rib reinforced in the surface of a mold made of epoxy mold material for molding a product having a recess in the surface, (c) spraying an epoxy molding material containing a reinforcement on the surface of the model to fill the recess; (d) placing the model in a shoe container chamber having the shape of a complete mold portion; (e) filling the shoe container with an epoxy mold material to form a complete mold portion; (f) holding the epoxy mold material in the container while the epoxy mold material in the container is cured to form the mold portion; (g) separating the mold portion from the model having an epoxy mold material in the recess and withdrawing the mold portion from the recess in the model in the form of a standalone reinforcing rib. Manufacturing method. (a) creating a model of elastomeric material having recesses on the surface; (b) applying a separating agent to the surface of the model, the method of producing a standalone rib reinforced within the surface of the plastic mold for forming a product having a recess in the surface, the method comprising: (c) pressing and hardening the plastic mold material containing the reinforcement into the recess of the model against the surface; (d) placing the model in a shoe container chamber having the shape of a complete mold portion; (e) filling the shoe container with a plastic mold material to form a complete mold portion; (f) curing the plastic mold material in the container while it is cured; (g) separating the mold portion from the model with the plastic mold material containing the reinforcement in the recess and withdrawing the mold portion from the recess in the model in the form of independent reinforcement ribs. Reinforced independent rib manufacturing method. (a) creating a model of elastomeric material having recesses on the surface; (b) placing the model in a shoe container; (c) applying a separating agent to the surface of the model, the method of producing a standalone rib reinforced within the surface of a mold of epoxy mold material for forming a product having a recess in the surface, the method comprising: (d) spraying an epoxy molding material containing reinforcement on the surface of the model to fill the recess; (e) placing the model in a shoe container chamber having the shape of a complete mold portion; (d) filling the shoe container with an epoxy mold material containing a reinforcement to form a complete mold portion; (e) applying pressure to the epoxy mold material in the shoe container to fill the recess with the epoxy mold material and the reinforcement; (f) holding the epoxy mold material in the container while the epoxy mold material in the container is cured; (g) separating the mold portion from the model having an epoxy mold material containing the reinforcement in the recess and withdrawing the mold portion from the recess in the model in the form of a standalone reinforcement rib. Reinforced independent rib manufacturing method. (a) a plurality of mold segments of epoxy resin molding material; (b) each of the segments in a tire mold having a radially inner tread forming surface having ribs for forming recesses in the surface, (c) the tread forming surface has recesses to form freestanding ribs of a mixture of epoxy mold material and reinforcement; (d) each of the mold segments is completely molded to mold a segment of a tire tread into the tire mold. The method of claim 9, And the recess is reinforced with a metal strip member attached to the segment and pulls the rib from the model to form one side of the shoe chamber to form a complete mold segment. The method of claim 10, At least one of the recesses is reinforced with a plurality of nested metal blades attached to the segment. The method of claim 9, Wherein each of the recesses is reinforced with a bent metal strip member to fill the curved recesses in the tire tread. (a) a plurality of mold segments of epoxy resin molding material; (b) each of the mold segments is fully molded to mold a segment of a tire tread to the tire mold; (c) A tire mold further comprising a metal split shoe for enclosing the mold segment made of an epoxy resin molding material, (d) the split shoe has a radially extending shoe side plate providing a U-shaped cross section in the radial plane including the axis of the mold, whereby the spent epoxy mold material of the split shoe divides the metal. A tire mold removed from the chamber of a mold shoe so that the shoe can be used again. The method of claim 13, And the side plates are substantially parallel to facilitate removal of the epoxy mold segment. The method of claim 14, In order to facilitate removal of the epoxy mold material and to re-use each of the split shoes, the distance of the side plates is made greater by the radially outer edge to provide a tapered side of the side plate. Tire mold. The method of claim 13, A tire mold, characterized in that a retaining means is placed on each outer circumferential surface of the mold segment to hold a mold segment of epoxy mold material in the split shoe and to separate the mold segment of epoxy material after use. The method of claim 13, A tire mold, characterized by reducing the article of the split shoe required for tires of different sizes by manufacturing the side plates with dimension standards for the airfoil angle and mold split diameter. The method of claim 17, The mold split diameter standard ranges from 19.770 inches (50.216 cm) to 22.840 inches (54.41 cm). The method of claim 18, Other split mold diameter standards are 20.420 inches (51.87 cm), 21.420 inches (54.41 cm), 21.030 inches (53.42 cm) and 22.140 inches (56.24 cm). The method of claim 17, 34.400 degrees 40.000 degrees 45.600 degrees 40.000 degrees 34.400 degrees 40.000 degrees 45.600 degrees 40.000 degrees 40.000 degrees Tire mold, characterized in that there are nine mold segments having a chord angle and chord angle sequence. (a) one central bracket member and two end brackets for supporting segments of the tire tread model; (b) spaced radially extending side members; (c) a radially outward tread forming a member connecting said side members; (d) an end plate member secured to said side member, said end bracket member and said central bracket member to enclose a tread chamber; (e) an inlet formed in one of the side members to communicate a slurry of plastic material from the source outside the shoe member to the chamber, the inlet forming the tread mold segment in the side member; In the split type shoe for molding a tire mold having a plurality of different split type shoes, Said side member has a substantially parallel surface such that said shoe may be mounted in a tire mold for applying said tread to a tire carcass upon removal of said side member and said central bracket member. . The method of claim 21, The side member is maintained in alignment with the end bracket, the lower end bracket member and the upper end bracket member by an alignment pin extending through the end bracket and the side member. Split shoe. The method of claim 21, A split type shoe for molding a tire mold, characterized in that it is arranged in a sealing means between said end plate, said end bracket and said center bracket. The method of claim 23, And the sealing means comprises an O ring cord material in the O ring groove of the end plate and the end bracket. A tire mold and tread manufacturing method as described in the specification and shown in the drawings.