The method of manufacture of studs and device for its implementation

 

(57) Abstract:

The invention can be used in the tire industry. In the method of manufacturing of thorns pressed molded body of studs made of composite material in the nests of the mold. Set in the buildings of the wear-resistant insert. The insert is installed in the recess of the socket of the mold. The slot communicates with the chamber vacuum to hold and axial orientation of the insert. Exercise then submission of a composite material under pressure in the nest molds and molded housing studs. The device comprises a split mold. At least one of the half-form is made with nests shape corresponding to the shape of the hull of a thorn snow. In the area of the bottoms of the slots of the mold is made boarding deepening. The cavity recess communicated through the through holes with the camera rarefaction. The invention allows obespechit reliable fastening of inserts in the housing without destroying the structure of the material of the body of the spike. The spikes have a high operational reliability. 2 S. p. f-crystals, 5 Il.

The invention relates to the tire industry and for the design of studs, which are equipped with the tyre tread transport medium"ptx2">

A known method of manufacture of studs, namely, that in the nest of the mold is performed by pressing the formation of a corps of thorns made of composite material (plastic) and establish in each case a wear-resistant insert (see GB, 1034446, B 60 C 11/16, publ. 29.06.66).

The peculiarity of this method is a certain sequence of actions, namely, that at first make molded by pressing in the nests of the mold housings made of plastic, and then in manufactured housing zapressovyvajutsja wear-resistant insert. To ensure reliable retention of the insert in the housing, the latter is a rough outer surfaces. The penetration of the insert into the cavity of the valve housing deformation of the walls of the holes with subsequent residual elastic relaxation, resulting in a wall of the casing compresses the insert.

The disadvantage of this method of manufacture of studs is that the introduction of the insert into the cavity of the valve housing must attach significant value of the pressing force, resulting in deformation of the wall is not due to the elasticity of materialare this case securely holds the insert only the first time. Lateral forces acting on the insert when it is in contact with the supporting surface when the rolling wheels of the vehicle, lead to the loosening of the insert into the case, resulting in further deformation of the walls of the housing. Because the communication patterns of case material in the zone of the hole walls were destroyed, the lateral forces acting on the insert, lead to expansion of the hole and the fallout from it is inserted.

A device for the manufacture of studs, containing the split mold, one proforma made with nests which form is collected in the half-form corresponds to the shape of the hull of the anti-skid spike (see, US, 3779299, B 60 C 11/16. publ. 18.12.73).

The disadvantage of this device is that this device is only intended for the forming and pressing spikes in the collection, the negative effects of which were described earlier.

The present invention is directed to the solution of the technical problem by combining two operations in the manufacture of a thorn, that is, to combine the operation of molding the molded body of the spike and the post operation in the case of wear-resistant insert and to ensure reliable fastening of the insert in building the query result is to improve the operational reliability and durability of studs, housing which is made of composite materials.

This technical result in part of the method is achieved in that in the method of manufacture of studs, namely, that in the nest of the mold is performed by pressing the formation of a corps of thorns made of composite material and establish in each case a wear-resistant insert to increase the strength of attachment of the wear-resistant inserts in the housing of the stud is made of a composite material, first in the nest molds set of wear-resistant inserts, and then produce a filled composite material under pressure for the subsequent formation of the corps of thorns.

And at the specified technical result is achieved in that the device for the manufacture of studs, containing the split mold, at least one proforma made with the slots, the shape of each of which is in the collection of half-form corresponds to the shape of the hull of a thorn snow, to ensure the quality of the mounting of the wear-resistant insert in the case of a thorn specified proforma in the area of the bottoms of the slots with the mounting side of the wear-resistant inserts in the case of a stud (side duct, and these holes on the outer side of the mold in communication with the chamber vacuum.

These characteristics are essential and interrelated with the formation of a stable set of essential features, sufficient to achieve the desired technical result.

So, pre-installation of the wear-resistant inserts in the slots of the mold allows for pouring in nests under pressure composite material to get ready studded, requiring no additional subsequent operations on the Assembly. This ensures maximum reliability of the mounting of the insert in the case, as the structure of the material of the latter is not destroyed relationships. And the connection of the insert with the walls of the casing is carried out by polymerization of the composite material, and providing increased adhesive interactions.

The present invention is illustrated by a specific example, which, however, is not only possible, but clearly demonstrates the possibility of achieving a given set of features required technical result.

In Fig. 1 shows a General view of the mold for molding studs p is ivci composite material in the slot; in Fig. 4 - phase separation of the mold after curing of the anti-skid spike; Fig. 5 - phase ready withdrawal of the anti-skid spike from the mold.

Device for the manufacture of studs (Fig. 1) designed to implement the proposed method of extrusion molding of studs, contains a split mold consisting of at least two semi-molds 1 and 2. Proforma 1 is performed with end-to-end channel 3 reported source 4 supply under specified pressure P1 of the composite material to be applied in the form of fluid from unpolymerized mass. The channel in proforma 1 is made so that when collecting half-form on the plane of separation of the latter this channel is located in the zone of the slot 5, made in proforma 2. The shape of the socket 5 repeats the form of the anti-skid spike, that is in the bottom of the socket 5 on the side opposite the parting of the mold, made a landing recess 6 for the wear insert 7, which are secured in this recess. Proforma 2 from the specified bottom (i.e. at the location specified deepening) is made with a through hole 8 provided with the camera depression 9, which is formed n the) directly in the cavity of the hole 8, is the vacuum pump 10 of any known performance. The chamber vacuum is configured to align it pressure up to the level of atmospheric by opening valve telling this chamber with the atmosphere.

Device for the manufacture of studs is a spike designed for the simultaneous fabrication of a large number of studs. However, due to the fact that the design of the mold for manufacturing a spike, and for the simultaneous fabrication of a large number of spikes fundamentally differ only in the number of nests, further description of the device and method will be presented on the example of a spike.

In Fig. 1 shows a mold in which the slot of the anti-skid spike is fully located in proforma 2. However, there is an example in which the portion of the slot may be made in proforma 1 (for example, in proforma 1 can be performed in place of forming the flange of the body).

Installation of wear-resistant inserts in the socket carried out at open half-form (Fig. 2). The insert is lowered into the socket, and sink into the recess 6. After installation of the wear-resistant inserts in deepened the Aqua pressed the butt to the bottom of the recess, overlaps the hole diameter less than the diameter of the recess, and is securely held there by the pressure difference (pressure in the chamber vacuum is less than atmospheric pressure). The depth of the recesses 6 corresponds to a given value of the protrusion of the insert from the housing of the anti-skid spike.

The method of manufacture of studs in this press form is that in the nest mold injected wear-resistant insert 7 (shown in Fig. 2 by the dashed line), carry out the installation of the insert 7 in the recess 6 of the socket and then connect the cavity openings 8 with chamber vacuum on the outside of the mold for positional fixation of the insert in the socket (retention and axial orientation of the insert).

After that make the convergence half-form and their connection to the plane of the connector (Fig. 3). Channel 3 of the mold halves 1 serves under pressure composite material, flows into the nest and fill it completely, while embracing the insert, the position of which relative to the longitudinal axis of the body of the spike is determined by the walls of the recess 6. The escape of air and excess composite material produced through the drainage. After filling nests produce polymerization of the mother is fty apart (Fig. 4). This removes the pressure of vacuum (disconnection occurs with camera vacuum and removes the pressure of vacuum (disconnection occurs with camera rarefaction and alignment of the pressure to atmospheric). Pay attention to the fact that pressure equalization can occur at the stage after the start of the polymerization process. Then produce the ready removal of a thorn snow from the slot. Withdrawal produced by any known method, for example through the use of pushers.

In Fig. 5 shows an example of the ready withdrawal of the spike from the socket due to the fact that the cavity openings 8 provides a high pressure P3. When reaching a certain level of this pressure is released thorns out of their nests. As devices that increase the pressure in the cavity openings 8, you can use the same vacuum pump 10, if you make it a combined adjustable function creates a vacuum and create high pressure.

1. The method of manufacture of studs, wherein the extrusion molded body studs made of composite material in the nests of the mold and set in the buildings of the wear-resistant insert, wherein the insert ustii insert, and then submit a composite material under pressure into the sockets of the mold to form the housing studs.

2. Device for the manufacture of studs, containing the split mold in which at least one proforma made with nests shape corresponding to the shape of the hull of a thorn-skid, characterized in that in the area of the bottoms of the slots of the mold is made of the planting hole, a cavity which is communicated through the through holes with the camera exhaustion.

 

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