CN214395523U

CN214395523U - Asymmetric vulcanization capsule for all-steel tire

Info

Publication number: CN214395523U
Application number: CN202023022309.0U
Authority: CN
Inventors: 谢成叶; 徐应中; 张锐; 马庄; 孙益; 孙和斌; 麻杨
Original assignee: Anhui Giti Radial Tire Co Ltd
Current assignee: Anhui Giti Radial Tire Co Ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-10-15
Anticipated expiration: 2030-12-14

Abstract

The utility model discloses an asymmetric vulcanization capsule of all steel tire relates to tire vulcanization production field, mould on capsule lower mould and the capsule fixed mutually, capsule lower mould thickness reduces, mould thickness increases on the capsule, makes the thickness of mould form asymmetric on capsule lower mould and the capsule, the utility model discloses a simple structure, the utility model discloses a adjust the vulcanization capsule of symmetry among the prior art for the capsule structural style of upper and lower thin capsule, make the capsule can offset the whole trend that descends of embryo when vulcanizing that the embryo dead weight caused, the difference in temperature that the part that produces the temperature transmission through the capsule is thicker simultaneously, the difference in temperature that the embryo existed on the lower mould when can offsetting vulcanizing reduces the sound balance mean value of mould on the embryo, has improved the holistic homogeneity of embryo, has improved the performance of embryo to a certain extent.

Description

Asymmetric vulcanization capsule for all-steel tire

Technical Field

The utility model relates to a tire vulcanization production field specifically is an asymmetric vulcanization capsule of all steel tire.

Background

In the existing tire manufacturing process, in the vulcanization process, the vulcanization bladder is vertically symmetrical, so that the pressure in the bladder is balanced after the inner pressure is punched, but the bladder is gradually obviously influenced by the self weight of the tire along with the increase of the specification and the increase of the flattening rate of the tire.

The prior art can not solve the trend of the whole descending of the tire blank during vulcanization caused by the dead weight of the tire blank; meanwhile, when the tire is vulcanized due to the fact that heat rises during vulcanization, the temperature of the upper die is larger than the temperature difference of the lower die and cannot be eliminated. So that the vulcanization degree of the upper mold and the lower mold of the vulcanized finished tire is different.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an asymmetric vulcanization capsule of all steel tire adjusts the vulcanization capsule of symmetry among the prior art for thick capsule structure thin down to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides an asymmetric vulcanization capsule of all steel tire, includes mould on fixed capsule lower mould and the capsule mutually, capsule lower mould thickness reduces, mould thickness increase on the capsule makes the thickness of mould on capsule lower mould and the capsule form asymmetric, the wall thickness of any point department of capsule lower mould all is less than the wall thickness of the capsule upper mould corresponding position department about capsule central line symmetry, mould is even and the same about the wall thickness of central line vertical part on capsule lower mould and the capsule.

As a further aspect of the present invention: the thickness of the lower die of the capsule is reduced by the same amount as the thickness of the upper die thereof is increased.

As a further aspect of the present invention: the wall thickness X2 at any point of the capsule lower die and the wall thickness X1 at the position of the capsule upper die which is symmetrical about the central line of the capsule meet the following conditions: the difference between X1 and X2 is in the range of 0.5-2 mm.

As a further aspect of the present invention: the wall thickness X2 at any point of the capsule lower die and the wall thickness X1 at the position of the capsule upper die which is symmetrical about the central line of the capsule meet the following conditions: the difference between X1 and X2 is 1.2-1.6 mm.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a novel structure, the utility model discloses a adjust the capsule structure form of vulcanizing of symmetry among the prior art for upper and lower thin, the trend that the embryo wholly descends when making the capsule offset the vulcanization that the embryo dead weight caused, the difference in temperature that the lower mould exists on the embryo when can offsetting the vulcanization is delayed to the temperature transmission production through the thick part of capsule simultaneously, reduces the sound balance mean value of the upper and lower mould of embryo, has improved the holistic homogeneity of embryo, has improved the performance of embryo to a certain extent.

Drawings

FIG. 1 is a simplified schematic diagram of a tire bladder;

FIG. 2 is a schematic view of the position of a post-vulcanization embryo temperature measurement point;

FIG. 3 is a line graph of comparative data for upper and lower mold temperatures at A/2A point of tire cure prior to bladder modification;

FIG. 4 is a line graph of comparative data for upper and lower mold temperatures at A/2A point of tire cure after bladder modification;

FIG. 5 is a line graph of data of the daily average of the capsule for improving the dynamic balance of the upper and lower molds of the front and rear vulcanized embryos;

FIG. 6 is a line graph of data of the daily average of the static balance of the upper and lower molds of the vulcanized embryos before and after the capsule improvement;

FIG. 7 is a line graph of the capsule improving the dynamic balance of the upper mold of the pre-and post-vulcanized embryos;

FIG. 8 is a line drawing showing the capsule improving the lower dynamic balance of the front and rear vulcanized embryos;

FIG. 9 is an amplitude line graph showing the absolute difference between the dynamic balance of the upper mold and the dynamic balance of the lower mold of the vulcanized embryo before and after the improvement of the capsule;

FIG. 10 is a line graph of the capsule improving the static balance of the pre-and post-vulcanized embryos;

FIG. 11 is a graph of the amplitude curves of the daily mean values of the static equilibrium of the embryos before and after the improvement of the capsules.

1-capsule upper die, 2-capsule lower die, 3-embryo upper die and 3-embryo lower die.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, an asymmetric curing bladder for all-steel tires includes a lower bladder mold and an upper bladder mold that are fixed to each other, the lower bladder mold has a reduced thickness, the upper bladder mold has an increased thickness, so that the lower bladder mold and the upper bladder mold are asymmetric in thickness, the wall thickness at any point of the lower bladder mold is smaller than the wall thickness at the corresponding position of the upper bladder mold that is symmetric about a central line of the bladder, and the wall thicknesses of the lower bladder mold and the upper bladder mold are uniform and the same about a vertical portion of the central line.

The thickness reduction amount of the lower capsule die and the thickness increase amount of the upper capsule die are kept the same, and the wall thickness X2 at any point of the lower capsule die and the wall thickness X1 at the position of the upper capsule die which is symmetrical about the central line of the capsule meet the following conditions: the difference between X1 and X2 is in the range of 0.5-2 mm, and the preferred range of the difference between X1 and X2 is 1.2-1.6 mm.

The utility model discloses a to vulcanize the capsule and set to asymmetric form, the in-process embryo that vulcanizes at the tire produces the trend of whole decline because of the dead weight, because of the last mould thickness of capsule is greater than the lower mould thickness of capsule, thinner capsule lower mould offsets the embryo volume that descends, and the thickness of mould is thick can delay the transmission of temperature on the capsule simultaneously, further offsets the difference in temperature that the mould exists about the embryo when vulcanizing. The utility model discloses the problem that the whole decline of child embryo and the unable elimination of the last lower mould difference in temperature when can overcome simultaneously among the prior art because of the vulcanization that the embryo dead weight caused has improved the quality after the tire vulcanization.

For verifying the technological effect that above-mentioned asymmetric capsule can produce, the utility model discloses drop into the vulcanization experiment to this capsule and verify, the experimental state is: in the test, the specification of the selection is 385/65R22.5EV416, 1408 finished tires are produced before capsule switching, and 1318 finished tires are produced after switching.

The utility model discloses improve the data of back tire vulcanization in-process upper and lower mould temperature and the data of bladder improvement middle and upper and lower mould temperature to the tire vulcanization in-process before the bladder improves and compare, as shown in fig. 2-4, under the vulcanization production of bladder before improving, the tire is shown as fig. 3 at the tire A point in vulcanization process and the actual temperature change of 2A point, can analyze from the experimental data result and draw: along with the progress of the tire vulcanization process, the difference between the temperatures of the point A and the point 2A of the tire is larger and larger, and the temperature of the point A of the upper mold of the embryo is obviously higher than the temperature of the point B of the lower mold of the embryo; the actual temperature variation of the tire during the vulcanization process at the tire point a and 2A under the improved vulcanization production of the tire by the bladder is shown in fig. 4, and the results of the experimental data can be analyzed to obtain: along with the progress of the tire vulcanization process, the temperature difference between the point A and the point 2A of the tire is gradually reduced and finally tends to be the same; the temperature contrast of two embryos formed before and after the capsule is improved can be obtained by the capsule: the utility model discloses an asymmetric capsule of upper and lower wall thickness can reduce the difference in temperature that the embryo in the vulcanization process exists about the upper and lower mould of central line symmetry corresponding position department, can reduce to above-mentioned asymmetric capsule to vulcanize the principle that the embryo exists the difference in temperature on the lower mould simultaneously and verify.

The utility model respectively compares the daily average values of the dynamic balance and the static balance of the upper and lower moulds of the vulcanized embryo generated by the capsule before and after the improvement, the dynamic balance of the embryo means that the heavier part of the embryo is taken from the upper and lower sides of the tire to measure under the inflation and rotation state, and the unit is expressed by g; the static balance of the embryo refers to the amount of mass unbalance of the embryo at rest, and the unit is expressed in g.cm.

FIG. 5 is a line graph of data for the daily average of the upper and lower mold dynamic balance after curing of a tire before bladder improvement, as can be derived from the data line graph shown in FIG. 5: the improved dynamic balance amplitude of the upper and lower dies of the capsule is obviously reduced compared with the amplitude of the daily mean value of the dynamic balance of the upper and lower dies of the capsule before improvement; FIG. 6 is a line graph of data for the daily average of the upper and lower dynamic balance of a vulcanized embryo after capsule modification, which can be derived from the data line graph shown in FIG. 6: the upper and lower module dynamic balance amplitude of the vulcanized embryo formed by the improved capsule is obviously reduced compared with the upper and lower module dynamic balance daily average amplitude of the vulcanized embryo formed by the capsule before improvement; through the contrast of the dynamic and static balance amplitude of the upper mold and the lower mold of the finished tire before and after the capsule is improved, the amplitude of the daily value of the dynamic and static balance of the improved finished tire can be obviously reduced, and the uniformity of the vulcanized tire is obviously improved.

The utility model discloses the last dynamic balance of the embryo that vulcanizes that forms around improving to the capsule and lower dynamic balance have carried out experimental test and experimental data contrast respectively, vulcanize the line graph of embryo's last dynamic balance experimental data around improving for the capsule as shown in figure 7, the following table is the mean value and the median of the embryo's last dynamic balance experimental data of vulcanising before the capsule improves, through the mean value and the median of the data line graph that figure 7 shows and experimental data, can the analysis reachs: no obvious change is found in the numerical value, distribution and median of the dynamic balance on the finished tire. As shown in fig. 8, which is a line graph of the lower dynamic balance test data of the vulcanized embryos before and after the capsule improvement, the following table 2 shows the mean and median values of the lower dynamic balance test data of the vulcanized embryos before and after the capsule improvement, and the data line graph shown in fig. 8 and the mean and median values of the test data can be analyzed to obtain: the dynamic balance value, distribution and median of the vulcanized embryo are changed obviously.

FIG. 9 is a graph showing the line of the amplitude curves of the absolute values of the difference between the upper dynamic balance and the lower dynamic balance of the vulcanized embryos before and after the capsule improvement, from which it can be seen that: the amplitude of the absolute value of the difference between the dynamic balance on the embryo and the dynamic balance under the embryo is reduced from 0-50 to 0-30, and is improved by about 40%.

Dynamic balance value of upper die	Mean value	Median value
			Before improvement	115	108.7
After improvement	114	107.6

TABLE 1

Dynamic balance of lower die	Mean value	Median value
			Before improvement	122.7	114.6
After improvement	112.5	105.6
			Lifting of	8.2％	/

TABLE 2

The utility model discloses vulcanized embryo's last mould static balance and lower mould static balance respectively carried out experimental test and experimental data contrast around improving the capsule, for the capsule improves the front and back vulcanized embryo's static balance experimental data broken line diagram as shown in figure 10, the following table 3 is the mean value and the median of the capsule improves front and back vulcanized embryo static balance experimental data, and data can be analyzed and reachs in the follow picture: the numerical value, distribution and median of the static balance all change well.

Static balance	Mean value	Median value
			Before improvement	5454	5081
After improvement	5215	4767
			Lifting of	4.38％	/

TABLE 3

The utility model discloses the data of capsule formation vulcanization embryo's static balance day average value carry out the analysis arrangement around improving, reachs like the amplitude broken line diagram shown in FIG. 11, and data change can the analysis reachs in the follow picture: the average value amplitude of the daily static equilibrium of the embryo is reduced from 4000-.

By combining the experimental data and the line graph formed by data analysis, the following can be verified: the vulcanizing capsules are arranged in an asymmetric mode, so that the embryo quantity of the whole descending of the vulcanized embryo and the temperature difference between the upper and lower dies of the embryo can be offset, the dynamic balance and the static balance of the upper and lower dies of the embryo can be changed well, the integral uniformity of the tire is improved to a certain degree, and the durability of the finished tire in a high-speed running state is further improved.

The utility model provides an increase of the last mould thickness of the asymmetric capsule of tire keeps the same with the increase of lower mould thickness, for example: the thickness of the upper die is reduced by 0.5mm compared with the thickness of the capsule lower die in the prior art, and the thickness of the lower die is increased by 0.5mm compared with the thickness of the capsule upper die in the prior art; the wall thickness X2 at any point of the capsule lower die and the wall thickness X1 at the position of the capsule upper die which is symmetrical about the central line of the capsule meet the following conditions: the difference between X1 and X2 is in the range of 0.5-2 mm.

In order to verify that the range value of the thickness relationship between the lower capsule mold and the upper capsule mold has specificity, the embodiment is verified by performing a simulation experiment on an embryo vulcanized by an asymmetric capsule to obtain:

according to the experimental data results, the following results can be obtained through analysis:

1. from a comparison of the experimental data of the prior art, examples 1-6, it can be derived: when the wall thickness difference range of mould position department on capsule lower mould wall thickness and the capsule about capsule central point symmetry was in 0.5-2 mm within range, the embryo that forms under this capsule effect, compare in prior art, the static balance mean value of embryo has the reduction of certain degree, the trend that dynamic balance mean value also has the reduction about the embryo simultaneously, simultaneously at capsule lower mould wall thickness and when the wall thickness difference range of mould position department on the capsule about capsule central point symmetry was in 1.2-1.6 mm within range, the embryo that forms under this capsule effect, compare in prior art, the static balance mean value of its embryo has obvious reduction, and the mould dynamic balance mean value has obvious reduction trend about the embryo simultaneously, the utility model discloses can improve the homogeneity of the embryo after the vulcanization to a certain extent, improve the wholeness ability of embryo to a certain extent.

2. From a comparison of the experimental data of the prior art, examples 1-6 and comparative examples 1-2, it can be concluded that: when the difference range between the wall thickness of any point on the capsule and the wall thickness of the position of the upper die of the capsule which is symmetrical about the central point of the capsule is out of the range of 0.5-2 mm, the embryo formed under the action of the capsule cannot play the technical effect superior to the prior art, and the specificity of the range limited by the difference between X1 and X2 is further verified in a reverse way.

To sum up, the utility model provides an asymmetric capsule of vulcanizing can make the capsule offset the difference in temperature that the mould exists about the embryo when vulcanizing, can reduce the sound balance mean value of mould about the embryo, has improved the holistic homogeneity of embryo, has improved the performance of embryo to a certain extent.

The utility model discloses novel structure, the operation is stable, the utility model discloses when using, the capsule is in the use, and to filling in the capsule and exert certain pressure to the tire of its outside vulcanization in gaseous, make the tire vulcanization shaping, the capsule is equivalent to the effect of interior mould, the utility model discloses a adjust the capsule of vulcanizing of symmetry among the prior art for the capsule structural style of upper and lower thin, the trend that the embryo wholly descends when making the capsule offset the vulcanization that the embryo dead weight caused, the difference in temperature that the embryo upper and lower mould exists can be offset through the delay of the thick part of capsule to the temperature transmission production simultaneously.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an asymmetric vulcanization capsule of all steel tire which characterized in that, includes fixed mutually's capsule lower mould and capsule upper mould, capsule lower mould thickness reduces, capsule upper mould thickness increases, makes the thickness of capsule lower mould and capsule upper mould form asymmetric, the wall thickness of capsule lower mould arbitrary point department all is less than the wall thickness of the capsule upper mould corresponding position department about capsule central line symmetry, capsule lower mould and capsule upper mould are even and the same about the wall thickness of central line vertical part.

2. The asymmetric curing bladder for all-steel tires according to claim 1, characterized in that, the thickness of the lower mold of the bladder is reduced by the same amount as the thickness of the upper mold thereof.

3. The asymmetric curing bladder for all-steel tires according to claim 1, characterized in that, the wall thickness X2 at any point of the lower bladder mold and the wall thickness X1 at the position of the upper bladder mold symmetric with respect to the bladder center line satisfy: the difference between X1 and X2 is in the range of 0.5-2 mm.

4. The asymmetric curing bladder for all-steel tires according to claim 3, characterized in that, the wall thickness X2 at any point of the lower bladder mold and the wall thickness X1 at the position of the upper bladder mold symmetric with respect to the bladder center line satisfy: the difference between X1 and X2 is 1.2-1.6 mm.