CN1735504A

CN1735504A - Tire mold and tread

Info

Publication number: CN1735504A
Application number: CNA2003801083660A
Authority: CN
Inventors: C·帕恩; D·勒菲弗
Original assignee: Michelin Recherche et Technique SA Switzerland; Societe de Technologie Michelin SAS
Current assignee: Michelin Recherche et Technique SA Switzerland; Societe de Technologie Michelin SAS
Priority date: 2003-01-06
Filing date: 2003-12-15
Publication date: 2006-02-15
Also published as: JP2006519120A; KR20050098857A; WO2004062898A3; BR0317952A; AU2003297066A8; AU2003297066A1; EP1585632A2; WO2004062898A2; CA2512548A1

Abstract

The present invention is a process for making an entire truck tire tread comprising the steps of securing tread mold segments comprising plates to a flat backing, placing a blank tread on the mold segments, and pressing the blank tread against the mold segments. The invention also comprises this process wherein the tread mold segments comprising plates are formed by the steps of machining at least one side of a plate so that the peak to peak variation of the plate surface is less than 5 microns, securing the plates to a flat backing; and machining a reverse tread pattern onto the secured plates. The present invention also comprises a process for making a mold for a tire tread comprising the steps of securing tread mold segments comprising plates of at least two different thicknesses to a flat backing, and machining a reverse tread pattern comprising ridges onto the secured plates, where the thickness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:10.

Description

Tire-mold and tyre surface

Technical field

The invention belongs to the tire-mold field.

Background technology

In the forming process of tire, must be able to discharge and to be enclosed in the tire of putting into mould and the whole air between the mould different piece.If the residual air that the minute quantity sealing is arranged will cause molded defective at outer surface of tire between mould and tire.This molded defective is all to be unacceptable from the viewpoint of tire workmanship or from the viewpoint of tire outward appearance.Now, know, can't guarantee to discharge air all in the mould naturally, that is to say, only by using gap between the mould different piece to guarantee to discharge air.Therefore the multiple measure that remedies is arranged, and wherein a kind of is extensive use of in tire industry, and this measure is that the position of any needs gets out little steam vent in mould.

When using this steam vent, can see their vestige on the moulding of tyres surface, the rubber kick of promptly protruding surface of tyre.Know,, just can guarantee exhaust, but also can cause the slight leakage of raw rubber simultaneously as long as the size in slit surpasses 0.05mm.At present, diameter can not be realized on very economical ground less than the hole of 0.05mm.Therefore, on a lot of tires, still can see the vestige of small de-air hole, the rubber kick of promptly protruding surface of tyre.

Description of drawings

Fig. 1 is the schematic diagram according to Tire tread molds of the present invention.

Fig. 2 is the schematic diagram according to a plate of Tire tread molds of the present invention.

Fig. 3 has represented a tyre surface of using Tire tread molds according to the present invention to make.

Fig. 4 is the enlarged drawing of tyre surface shown in Fig. 3.

Summary of the invention

The present invention relates to a kind of method of making whole truck tire tread, this method comprises the following steps: that the tread mould parts that will comprise a plurality of plates are fixed on the flat liner plate, blank tread is placed on the mold component, press to mold component with blank tread then.The present invention also comprises following method, forms through the following step comprising the tread mould parts of a plurality of plates: at least one side of processing plate, and the peak change that makes the plate surface is fixed to these plates on the flat liner plate less than 5 microns; On fixing plate, process decorative pattern then with reverse tread.

The present invention also comprises a kind of method of making Tire tread molds, the tread mould parts that comprise the following steps: to comprise the plate of at least two kinds of different-thickness are fixed on the flat liner plate, on fixing plate, process decorative pattern then with reverse tread, comprise fin in the decorative pattern, the thickness that wherein is in the plate under the fin is chosen to make that the width and the aspect ratio of fin is not less than 1: 10 on the plate.

The specific embodiment

The present invention relates to a kind of method of making whole truck tire tread, this method comprises the following steps: that the tread mould parts that will comprise a plurality of plates are fixed on the flat liner plate, blank tread is placed on the mold component, press to mold component with blank tread then.The present invention also comprises following method, and wherein the tread mould parts comprise a plurality of plates, and these plates form through the following step: at least one side of processing plate, and the peak change that makes the plate surface is fixed to these plates on the flat liner plate less than 5 microns; On fixing plate, process decorative pattern then with reverse tread.

The present invention also comprises a kind of method of making Tire tread molds, the tread mould parts that comprise the following steps: to comprise the plate of at least two kinds of different-thickness are fixed on the flat liner plate, on fixing plate, process decorative pattern then with reverse tread, comprise fin in the decorative pattern, the thickness that wherein is in the plate under the fin is chosen to make the width of fin on the plate and aspect ratio to be not less than 1: 10.

Fig. 1 has represented an embodiment according to Tire tread molds of the present invention (10) parts.Dull and stereotyped (20) are fixed together, and form parts of full die.In the present embodiment, plate (20) is fixing with the bar (60) that passes plate mesopore (50).End piece (70) is fixed together plate.On a side of mould (10), be processed with decorative pattern with reverse tread.This decorative pattern comprises a plurality of fins (40) and depression (45).According to the present invention, it is a blanket that plate (20) begins, as shown in Figure 2.In one embodiment of the invention, plate is made by the aluminium of about 10 millimeters thick.This plate is roughened on its one or two main surfaces, makes peak on finished surface and peak-to-peak maximum height difference at about 0.005 millimeter.Its roughness makes that the gas between the plate can be discharged in the tyre surface forming process, but little of preventing to form burr.

A kind of tread contour is machined into (see figure 1) on the plate that is fixed together.A kind of example of decorative pattern of and reverse tread as shown in the figure.Comprise fin (40) and depression (45) with the decorative pattern of reverse tread.In one embodiment of the invention, the height to width ratio of fin is not more than 10: 1.This has guaranteed the intensity of tread mould decorative pattern.In another embodiment of the present invention, plate has two kinds of different thickness at least.In this manner, plate can be chosen to make the height to width ratio of the fin that is supported by plate to be not more than 10: 1.In other words, narrower part is discontinuous between two boards in the tread mould.

Parts shown in the figure will install to (not shown) on the flat liner plate, and be fixed.A blank tread (not shown) will be placed on the mould, and last result will form a tire tread as shown in Figure 3.Fig. 4 is the enlarged drawing of tyre surface shown in Fig. 3.

Fig. 4 has represented almost invisible burr line (100), and height is less than 0.1 millimeter.Therefore, use the present invention will greatly improve tread appearance.

Can further understand the present invention by reading following non-limiting instance.

Example 1

For 215/65R16XZE-SA type tire tread is made a mould.The both sides of 6061 type aluminium sheets (3/8 inch or 9.525 millimeters) are roughened with the permission exhaust, and are fixed together.Tread contour is processed to three part tyre surfaces (889 millimeters of total lengths).Die surface is through blasting treatment then.Each several part is secured in a press, and carries out vulcanizing treatment altogether seven times.Repeat said method then.

Fig. 3 and Fig. 4 have represented the result of this method.

Exhaust performance: part of detecting is placed in the middle position of pressure, and this position is the easiest position that causes discharge characteristic control problem.After whole 14 vulcanizing treatment, the tyre surface that part of detecting is made is controlled defective without any discharge characteristic.In addition, the moulding back side of even all testing tyre surface is also without any the exhaust defective.This defective once was the exhausting problem of this specially-shaped.This shows that the air of tyre surface back side sealing can pass rubber and also discharge by the gap between the plate.

The tire profile: integrated appearance is well more a lot of than the unitary mould with steam vent made from direct processing method, seems the same with the new tire of Michelin appearance standard regulation.The height of peak is very little between the plate.As seen they but can't measure.

Burr: in the primary vulcanization test, all plates do not have burr in the part of side processing.In sulfuration test for the second time, any one in three parts all do not have burr.In the test, a part has the plate of processing in a side, and other two parts have the plate of all processing in both sides.

The tread surface of making has identical quality with the tyre surface that is processed into by other any method.Inconsistent very little between the each several part.As seen they but can't measure.The accuracy that this means the accuracy of each several part length and CNC machinery three-dimensional dimension is fine.We expect that the accuracy of mould three-dimensional dimension will be in the scope of a few percent millimeter.

Peak with wedge angle; Profile around the peak is cleaner and seem cleaner and tidier.Least radius between groove walls and the tread surface is 1.0 millimeters.Do not exist picture owing to the observable step that uses various moulding cutting tools to cause.This is a general problem in the straight forming processing method.This is because all shaping jigs all are made into accurate length, and the axle assembly of CNC machinery has temperature compensation.

Claims

1. method of making whole truck tire tread may further comprise the steps:

(a) the tread mould parts that will comprise a plurality of plates are fixed on the flat liner plate;

(b) blank tread is placed on the described mold component; And

(c) described blank tread is pressed to described mold component.

2. the method for claim 1, wherein said tyre surface length is greater than three meters.

3. the method for claim 1, the wherein said tread mould parts of a plurality of plates that comprise are formed by following steps:

(a) at least one side of a plate of processing, the peak change that makes described plate surface is less than 5 microns;

(b) described plate is fixed on the flat liner plate;

(c) decorative pattern of one of processing and reverse tread on oneself fixing plate.

4. method of making Tire tread molds may further comprise the steps:

(a) the tread mould parts that will comprise plate are fixed on the flat liner plate;

(b) decorative pattern of one of processing and reverse tread on fixing plate;

Comprise fin in the wherein said tread contour, and the width of fin and aspect ratio are not less than 1: 10.

5. method as claimed in claim 4, wherein said plate is made of aluminium.

6. a Tire tread molds comprises a plurality of parts, and each parts has a plurality of plates that are fixed on the flat liner plate, and the width of some of them plate is bigger 2 millimeters than the width of other parts.

7. tire tread that comprises the mould burr, wherein said burr comprise that height is less than 0.1 millimeter line.

8. Tire tread molds comprises a plurality of tread mould parts of the plate with at least two kinds of different-thickness.

9. mould as claimed in claim 9, the thickness difference of wherein said plate are at least 7 millimeters.

10. method of making Tire tread molds may further comprise the steps:

(a) the tread mould parts that will comprise the plate of at least two kinds of different-thickness are fixed on the flat liner plate;

(b) decorative pattern of processing and reverse tread on fixing plate comprises fin in the decorative pattern;

The thickness that wherein is in the plate under the fin is chosen to make the width of fin on the plate and aspect ratio to be not less than 1: 10.