CN110781554A - Method for calculating drum width of heavy-load all-steel radial tire forming drum - Google Patents
Method for calculating drum width of heavy-load all-steel radial tire forming drum Download PDFInfo
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Abstract
The invention discloses a method for calculating the drum width of a heavy-load all-steel radial tire forming drum, which comprises the following steps: c ═ 2ac/(1+ t)) -2[ L-B ] -z, in the formula: ac is the length of a carcass cord from the center of a tire crown to the lower end point of a tire bead; t is the cord elongation of the carcass of the all-steel tire; l is the drum shoulder curve length; b is the height of the drum shoulder curve; z is a coefficient. By accurately calculating the width of the forming drum, the problem that the cost is wasted due to the fact that the forming drum is machined again because the width of the forming drum is not properly designed is avoided. And according to the characteristic that the machine head material of the heavy-duty all-steel radial tire is uniformly distributed, a machine head curve is designed, the problems that the material is accumulated and the rolling of a forming process is difficult and the like due to uneven material distribution at a forming machine head are solved, and the smooth operation of a secondary forming machine project can be effectively ensured.
Description
Technical Field
The invention belongs to the technical field of tires, and particularly relates to a method for calculating drum width of heavy-load all-steel radial tire forming.
Background
In China tire heavy load market (the bearing coefficient is more than 2.5), heavy load tires are produced by secondary method forming machines in the current heavy load tire production manufacturer research, because components such as tire bead seam allowance cloth produced by the secondary method forming machines are not piled, a reverse wrapped tire body cord line is parallel to a tire body (see figures 1 and 2), seam allowance pressing is tight, and the like, the characteristics that a primary method forming machine cannot achieve are achieved.
The design of the forming drum of the secondary forming machine mainly comprises the design of a machine head curve and the design of a drum width.
If the curve design of the molding machine head is unreasonable, the material transition of the molding machine head is uneven due to excessive material at the machine head, and the phenomenon of serious protrusion occurs. That is, if the material of the machine head is too high and is unevenly distributed, the pressure regulating phenomenon occurs in the seam allowance rolling process, and the seam allowance rolling process is not compact.
The design of the machine head curve of the heavy-load product can be seen from the forming material distribution diagram 1, and the heavy-load product is greatly different from a standard load product and a common load product: the main difference is that the excessive material at the machine head causes the excessive thickness of the material at the machine head, the material at the machine head is not uniformly distributed, and the excessive thickness of the shoulder position of the machine head causes the uneven transition of the seam allowance of the embryo.
The drum width design reference data includes: the flat width of a one-step method forming drum is set, but the design of the two-step method forming drum of the heavy-duty all-steel radial tire has no theoretical basis, and the error of the formula of the skew and the semi-steel is referred to be larger. The flat width of the one-time forming machine is set as the technological flat width, the numerical value is set in the program, and the position of the distance in the steel wire ring is the flat width position. The drum width of the one-step forming machine does not have the problem of setting the drum width, and the process flat width can be adjusted at will.
The design of the bias tire has great deviation no matter the design is a machine head curve or a forming drum width. Because the heavy-duty all-steel radial tire has more material distributed at the forming machine head, the material of the heavy-duty product has more layers than the common product at the machine head. The situation that the material is unevenly distributed and jump pressure occurs in the rolling process of the press roll due to serious stacking often occurs. And the difference between the extension of the tire body formed by the heavy-load all-steel-wire secondary method and the bias tire is calculated, and the drum width error calculated by using the formula of the bias tire is larger. Therefore, how to develop a calculation method for the drum width of a heavy-load all-steel radial tire forming drum has important practical significance for reducing errors.
Disclosure of Invention
The invention provides a method for calculating the forming drum width of a heavy-load all-steel radial tire secondary forming machine according to a machine head curve and a section inner contour 2ac (see figure 3) aiming at the characteristic that the number of layers of bonding materials of heavy-load all-steel at a machine head is large. The invention fills the blank of the design of the domestic heavy-load all-steel radial tire building drum.
The technical scheme adopted by the invention is as follows:
a method for calculating the drum width of a heavy-duty all-steel radial tire forming drum comprises the following calculation formula:
C＝(2ac/(1+t)-2[L-B]-z
in the formula: ac is the length of a carcass cord from the center of a tire crown to the lower end point of a tire bead;
t is the cord elongation of the carcass of the all-steel tire;
l is the drum shoulder curve length;
b is the height of the drum shoulder curve;
z is a coefficient.
Further, a is the center of the crown; c is the intersection point between the horizontal extension line of the bottom of the bead ring and the tire body.
Further, L ═ ef, e is a tangent point between a shoulder curve of the forming drum and a transverse outer plane of the forming drum; f is the tangent point between the shoulder curve of the building drum and the longitudinal outer plane of the building drum.
Further, B is the vertical height between a tangent point f between a shoulder curve of the forming drum and a longitudinal outer plane of the forming drum and a transverse outer plane of the forming drum.
Furthermore, z is limited by the overturning angle when the steel ring is shaped, the value of z is 2-12, and the maximum value is half of the width of the steel ring.
Further, the forming drum is prepared by adopting a secondary forming machine.
Further, one forming drum of the two-shot forming machine corresponds to one drum width.
Furthermore, the two-step forming machine forming drum has the following styles: half drum or half core wheel.
Further, the diameter of the forming drum is set to be 595mm, and the thickness of the size of the filled glue in the forming drum is 16 mm.
Furthermore, the machine head curve of the forming machine realizes the rolling compaction of the seam allowance by controlling the material distribution at the machine head of the forming machine to be uniform. Through rational design forming head curve height and width, control aircraft nose department material distribution even, avoid the material to pile up too much, avoid forming the protruding too high phenomenon in rim of a mouth department.
Further, the calculated value of the drum width of the building drum is the same as the actual value of the drum width of the building drum.
The invention has the beneficial effects that:
the invention aims to design a forming drum of a heavy-duty all-steel secondary forming machine, and avoid cost waste caused by re-processing the forming drum due to improper design of the width of the forming drum by accurately calculating the width of the forming drum. And according to the characteristic that the machine head material of the heavy-duty all-steel radial tire is uniformly distributed, a machine head curve is designed, the problems that the material is accumulated and the rolling of a forming process is difficult and the like due to uneven material distribution at a forming machine head are solved, and the smooth operation of a secondary forming machine project can be effectively ensured.
Drawings
FIG. 1 is a schematic view of a two-shot building machine producing carcass turnup and carcass cords for a tire;
in fig. 1, a carcass cord 2, a bead ring 3, and a carcass turnup cord.
FIG. 2 is a schematic view of a one-shot building machine producing carcass turnups and carcass cords for a tire;
in fig. 2, 1, carcass cord; 2. a bead ring; 3. and (4) tire body reverse wrapping cords.
FIG. 3 is a schematic cross-sectional view of a tire;
in fig. 3, 1, tread; 2. a belt ply; 3. a sidewall; 4. an inner liner layer; 5. a carcass; 6. rubber padding; 7. wear-resistant glue; 8. wrapping cloth at the edge of the steel wire; 9. wrapping with nylon cloth; 10. a bead ring; 11. filling glue; 12. filling glue;
in FIG. 3, a is the crown center; b is the intersection point between the horizontal extension line of the inner end point of the steel wire ring and the tire body;
c is the intersection point between the horizontal extension line of the bottom of the bead ring and the tire body;
ab-crown center to bead inner end carcass cord length;
ac-crown center to bead underend carcass cord length;
FIG. 4 is a schematic diagram of a two-pass building drum after the semi-finished product containing the codes of the building drum is attached;
FIG. 5 is a schematic view of a two-pass building drum embodying the attachment of the semi-finished product to the building drum;
FIG. 6 is a schematic diagram of a two-pass drum half-product after application of the material distribution of the enlarged molding head shoulder;
in fig. 4, 5 and 6, 1, tread; 2. a belt ply; 3. a sidewall; 4. an inner liner layer; 5. a carcass; 6. rubber padding; 7. wear-resistant glue; 8. wrapping cloth at the edge of the steel wire; 9. wrapping with nylon cloth; 10. a bead ring; 11. filling glue; 12. filling glue;
A. the width of the molding head; B. the height of the curve of the molding machine head; C. the width of the building drum; D. the building drum diameter; E. the width of the drum tile is molded; F. the thickness of the formed drum tile; H. the height of the machine head; r1, R2, R3 and R4 are guide arcs;
FIG. 7 is an X-ray illustration of a tire when the drum width is set too large;
FIG. 8 is a schematic view of a tire X-ray with a proper drum width setting;
fig. 9 is an X-ray view of the tire when the drum width is set too small.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A design of drum width of a heavy-load all-steel radial tire forming drum comprises the following steps: the process flat width of the all-steel radial tire one-step molding machine has the same meaning as the width of a molding drum of a two-step molding machine.
The parameter setting affects the performance of the tire. If the flat width setting is too large or too small, the performance of the tire is affected, resulting in increased tire waste or early damage to the tire.
If the flat width is set too small, it will result in too thin an inner liner and early damage during tire use, and its X-ray form is shown in fig. 7.
If the flat width setting is too large, it may cause the carcass cord to be excessively bent, resulting in waste. The X-ray form is shown in FIG. 9.
Therefore, the setting of the flat width needs to be accurate, and the stretching value of the tire body cord is ensured to be constant. The normal X-ray pattern is shown in figure 8. .
The flat width of the one-time forming machine is set as the technological flat width, the numerical value is set in the program, and the position of the distance in the steel wire ring is the flat width position. The drum width of the one-step forming machine does not have the problem of setting the drum width, and the process flat width can be adjusted at will.
The two-shot forming machine is a forming drum corresponding to a drum width, and the forming drum of the general two-shot forming machine has the following styles: half drum or half core wheel.
The drum width calculation precision of the secondary forming machine relates to the progress and development cost of products, the cost of the forming drum is generally 3 ten thousand yuan, the processing period is 45 days, and if the secondary forming drum is unreasonably designed, the original processing forming drum is scrapped, and the development period is delayed.
By adopting the designed forming drum, trial production and batch production verification, the calculation formula of the drum width of the forming drum can meet the requirement of the drum width design of a heavy-duty all-steel secondary forming machine, X-ray display shows that the angle of a tire body cord is qualified, and the cord stretching is qualified. Through practical inspection, the design calculation of the invention can achieve the accurate calculation of the drum width of the forming drum of the heavy-load all-steel secondary forming machine. Providing theoretical basis for determining the design of the forming drum with various specifications.
In addition, the invention creates economic value: the forming drum of the heavy-duty TBR secondary forming machine can be accurately designed at one time. The error of secondary processing caused by inaccurate calculation of the forming drum is avoided, the trial production and normal production of products are ensured, and the product development period is shortened.
Setting the width of a forming drum of a load forming machine, searching data and displaying: the calculation formula of the drum width comprises the setting of the drum width of an oblique crossing tire, a semi-steel radial tire and a one-time method forming drum, and related data introduction, but the design of the drum width of a heavy-duty TBR all-steel radial tire forming machine has no corresponding formula, the drum width of a TBR secondary method forming drum is calculated by adopting the formula of the oblique crossing tire and the semi-steel radial tire forming machine, and the error is too large to be applied. The design introduces the design of the drum width formed by the all-steel secondary method, and is accurate and reliable after repeated verification. Through calculation, the width of the forming drum can be determined at one time, and the specific discussion is as follows:
| code number | Code meaning |
| D | Outside diameter |
| A | Width of nose curve |
| H | Height of machine head |
| B | Height of nose curve |
| F | Thickness of formed drum tile |
| R1 | Curved connecting arc of forming machine head |
| R2 | Arc of guide |
| R3、R4 | Arc of guide |
| A | Width of forming drum |
Comparing fig. 1 and fig. 2, it can be seen that the two-pass tire carcass turnup cords and the carcass cords are kept parallel, while the one-pass tire carcass turnup cords and the carcass cords are at an angle of 35 degrees.
The names of the sections of the tire section can be seen in fig. 3, knowing how the inner contours 2ab and 2ac are defined.
The meaning of the numbering of the building drum can be seen in fig. 4.
Fig. 5 shows how the semifinished product is applied to the building drum.
The material distribution in the shoulder of the molding head is enlarged as can be seen in fig. 6.
It can be seen from fig. 7 that when the drum width is too small, the carcass cords are too straight, resulting in a thin inner liner X-ray illustration.
The normal X-ray schematic can be seen in fig. 8.
It can be seen from fig. 9 that the X-ray illustration of the carcass cord bending is caused when the drum width is too large.
Example 1
The drum width is calculated by three formulas: 【1】 The drum width of the oblique tire forming drum, the drum width of a flat drum of a full-steel one-step forming machine and the drum width of a semi-steel one-step forming drum are respectively (2) and (3).
【1】 The method for calculating the drum width of the building drum of the bias tire comprises the following steps:
c ═ 2ab/(1+ e1) × (b) -2[ L × cos (b) -a ] … … formula 1
C-the forming head width;
2 ab-length of cord between inner end points of two steel wire rings, and length of cord of inner outline in tire;
e 1-assumed elongation value of the cord;
b-carcass cord angle;
l-drum shoulder curve length;
a-drum shoulder width;
comparative example 2
【2】 The formula for calculating the flat drum type drum width of the all-steel one-step forming machine is as follows:
c ═ 2ab/(1+ t)) … … formula 2
2 ab-length of cord between inner end points of two steel wire rings, and length of cord of inner outline in tire;
t, the elongation of the tire body cord of the full steel wire TBR tire;
comparative example 3
Semi-steel radial tire
【3】 The calculation formula of the drum width of the once-through semi-steel forming drum is as follows:
c ═ 2ab/(1+ e1) -2(L + x sin (n) -a) … … formula 3
2 ab-length of cord between inner end points of two steel wire rings, and length of cord of inner outline in tire;
e 1-assumed elongation value of the cord;
l-drum shoulder curve length;
x sin (n) -process correction factor;
x-the distance from the outer edge of the steel wire ring to the machine head;
n-the twisting angle of the bead cord fabric winding steel wire ring (when in expansion shaping);
a-drum shoulder width;
the following examples illustrate
Such as:
is calculated by the formula 1
| 2ab(mm) | e1 | L(mm) | A(mm) | b |
| 762 | 0.02 | 55.2 | 50 | 90 |
C＝736.65
Is calculated by equation 3
| 2ab(mm) | e1 | L(mm) | x(mm) | n(°) | sin(n) | A(mm) |
| 762 | 0.02 | 55.2 | 13.6 | 3 | 0.14112 | 50 |
C711.9, the angle cannot be determined accurately because the change in n value has a large influence on the C value. This formula cannot be applied at TBR.
According to the relation between 2a 'b' in the material distribution diagram on the head of the forming machine and the length 2ab of the inner contour of the material of the finished material distribution diagram: 2ab/(1+ e1) ═ 2a 'b'
Through the measurement, C is 685mm (actual 668mm)
From the above calculations it can be seen that the calculation of the material distribution on the building drum is closest to the actual value, but that there is also a large error.
And (3) knotting: with the above three drum widths calculated, the carcass cords will be caused to bend. (the X-ray map is in accordance with fig. 9), it can be seen that equations 1 and 3 cannot be applied to the calculation of the width of the heavy duty TBR building drum, and there is also a large error in the calculation using the material distribution.
Example 2
The laminating material of the forming machine head of the heavy-duty all-steel radial tire is as follows: 4 layers of nylon wrapping cloth, 2 layers of tire bodies, 2 layers of sub-opening wrapping cloth, lower filling glue, upper filling glue, an inner liner layer and 2 types of glue (as shown in figure 3). There are 13 layers of semi-finished products with different thicknesses.
The design principle of the machine head curve of the forming drum of the heavy-duty all-steel secondary forming machine is to ensure that the material at the forming machine head is uniformly distributed and avoid large seam allowance deformation caused by too high bulge at the forming machine head.
The size design of the forming machine head specifically comprises the following steps:
d-outer diameter: the 20 inch roto-molding drum diameter was set to 595mm in diameter.
The actual effect of the application of the semifinished product on the building drum can be determined from the distribution of the building material according to fig. 5, and the building drum dimensional parameters are determined by repeated calculations.
The building drum dimensional parameters are detailed in the following table: (see figure 4 for concrete code)
The following provides a design formula of the drum width of a heavy-duty TBR secondary forming machine
C ═ 2ac/(1+ t)) -2[ L-B ] -z … … formula 4
a c-1/2 finished tire inner contour cord length (bead ring bottom);
t-is the elongation of the tire carcass cord of the all-steel-wire TBR, and the elongation of the tire carcass of the TBR is 2 percent;
the length L of the L-drum shoulder curve is equal to ef, the L is the length of an arc curve between the ef, and e is a tangent point between the forming drum shoulder curve and the transverse outer plane of the forming drum; f is the tangent point between the shoulder curve of the building drum and the longitudinal outer plane of the building drum.
B-drum shoulder curve height; the method specifically comprises the following steps: the tangent point f between the shoulder curve of the building drum and the longitudinal outer plane of the building drum is at a vertical height from the transverse outer plane of the building drum.
z-coefficient. z is limited by the turning angle when the steel ring is shaped, the value of z is 2-12, and the maximum value is half of the width of the steel ring.
| 2ac | t | L | B | z |
| 769.4 | 0.02 | 55.2 | 14.35 | 4 |
C-668.6 (actual 668mm)
Through design and production verification, the formula 4 can meet the design of the drum width of a forming drum of a heavy-duty all-steel secondary forming machine, X-ray shows that the tire body cord is qualified (the X-ray shape accords with the figure 8). Through actual inspection, the calculation can achieve the accurate calculation of the drum width of the forming drum of the heavy-duty all-steel secondary forming machine.
The above description is not meant to be limiting, it being noted that: it will be apparent to those skilled in the art that various changes, modifications, additions and substitutions can be made without departing from the true scope of the invention, and these improvements and modifications should also be construed as within the scope of the invention.
Claims (10)
1. A method for calculating the drum width of a heavy-load all-steel radial tire building drum is characterized in that the drum width of the building machine is calculated according to the following formula:
C＝(2ac/(1+t))-2[L-B]-z
in the formula: ac is the length of a carcass cord from the center of a tire crown to the lower end point of a tire bead;
t is the cord elongation of the carcass of the all-steel tire;
l is the drum shoulder curve length;
b is the height of the drum shoulder curve;
z is a coefficient.
2. The method for calculating the drum width of a heavy-duty all-steel radial tire building drum according to claim 1, wherein a is the center of a tire crown; c is the intersection point between the horizontal extension line of the bottom of the bead ring and the tire body; e.
3. the method for calculating the drum width of a heavy-duty all steel wire radial tire building drum according to claim 1, wherein L ═ ef, e is a tangent point between a shoulder curve of the building drum and a transverse outer plane of the building drum; f is the tangent point between the shoulder curve of the building drum and the longitudinal outer plane of the building drum.
4. The method for calculating the drum width of a heavy-duty all steel radial tire building drum according to claim 1, wherein B is the vertical height between the tangent point f between the shoulder curve of the building drum and the longitudinal outer plane of the building drum and the transverse outer plane of the building drum.
5. The method for calculating the drum width of the heavy-duty all-steel radial tire building drum according to claim 1, wherein z is limited by the overturning angle during the steel ring shaping, and has a value of 2-12, and the maximum value is half of the steel ring width.
6. The method for calculating the drum width of the heavy-duty all-steel radial tire building drum according to claim 1, wherein the building drum is prepared by a two-step forming machine.
7. The method of claim 6, wherein one drum width of the secondary building machine corresponds to one drum width.
8. The method for calculating the drum width of the heavy-duty all-steel radial tire building drum according to claim 6, wherein the model of the secondary building machine building drum is divided into: half drum or half core wheel.
9. The method for calculating the drum width of a heavy-duty all-steel radial tire building drum according to claim 1, wherein the machine head curve of the building machine realizes the rolling compaction of the rim by controlling the material distribution at the machine head of the building machine to be uniform.
10. The method of claim 1, wherein the drum width of the forming drum is the same as the actual value of the drum width.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112721545A (en) * | 2020-12-29 | 2021-04-30 | 安徽佳通乘用子午线轮胎有限公司 | All-steel radial tire capable of improving elongation rate of tire cord |
| CN113686282A (en) * | 2021-07-29 | 2021-11-23 | 山东玲珑轮胎股份有限公司 | Contrast measurement method for quantifying length of inner contour cord of all-steel radial tire |
-
2019
- 2019-09-27 CN CN201910921858.4A patent/CN110781554A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112721545A (en) * | 2020-12-29 | 2021-04-30 | 安徽佳通乘用子午线轮胎有限公司 | All-steel radial tire capable of improving elongation rate of tire cord |
| CN113686282A (en) * | 2021-07-29 | 2021-11-23 | 山东玲珑轮胎股份有限公司 | Contrast measurement method for quantifying length of inner contour cord of all-steel radial tire |
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