JP5886132B2 - Tube forming machine and tube manufacturing method - Google Patents

Description

  The present invention relates to a tube forming machine for forming a tube used for, for example, a tire and a method for manufacturing the tube.

For example, in order to mold a tube of a tire, a hollow flat body made of an unvulcanized rubber material is cut into a predetermined length, and both end faces are crimped and joined endlessly (tube A molding machine) is known (see Patent Document 1).
Although FIG. 7 is not described in the patent document, like the patent document 1, the conventional tube molding machine which crimps | bonds the both end surfaces of a hollow tube raw material | dough and joins it endlessly is shown schematically. FIG.
The tube molding machine 1 includes a lower left and right molding machine base 10 in the figure and a left and right arm 20 disposed on the upper side of the figure, and is formed on the upper surface of the left and right molding machine bases 10. Lower and upper molds 15 are respectively mounted in the recesses 12 and the recesses 22 formed on the lower sides of the opposing surfaces of the left and right arms 20. Further, unvulcanized tube fabric, that is, tube raw fabric TR, is placed on the upper portion of the opposing surface of the mold 15 on the lower side of the left and right molding machines 10 and the lower portion of the opposing surface of the mold 15 on the upper side of the left and right arms 20. A rubber lining 30 is attached, which is deformed following the deformed tube raw material TR when it is butted and pressure-bonded, thereby increasing the thickness of the joining portion and strengthening the joining.
Here, the molding machine base 10, the lower die 15 and the rubber lining 30 are referred to as the lower molding portion 2, and the arm 20, the upper die 15 and the rubber lining 30 are referred to as the upper molding portion 3. That's it. The molding parts 2 and 3 are arranged opposite to each other on the lower upper side and the left and right sides.

In this tube forming machine 1, a hollow tube raw material TR extruded from an extruder (not shown) is cut to a predetermined length by a cutter (not shown), and then the cut ends are brought into contact with each other to be crimped. Is done.
When this tube is crimped, the upper molding part 3 is lowered toward the lower molding part 2 (molding machine base 10) by a lifting mechanism (not shown) to clamp (clamp) the end of the tube raw fabric TR. The upper, lower, left and right molds 15 are vise (pressed against each other) through a rubber lining 30 by vise means (not shown).
Note that the term “clamp” used here means that the upper molding portion 3 is lowered toward the lower molding portion 2 by an elevating mechanism, and the tube is placed on the lower molding portion 2. The term “vice” means that the fabric TR is sandwiched, and the tube raw fabric TR clamped by the lower molding portion 2 and the upper molding portion 3 that are arranged to face each other is pressed against each other and crimped.

  Specifically, when the tube is molded by the tube molding machine 1, the tube raw fabric TR placed on the lower molding unit 2 is clamped by the upper molding unit 3 and the lower molding unit 2. Next, a portion protruding from the rubber lining 30 of the clamped tube raw fabric TR is determined at a position close to that to form a fresh surface, and the right and left side cross sections are visibly molded into an endless hollow annular shape.

In this crimping molding, in order to ensure the necessary joint performance of the tube, it is necessary to clamp the tube raw fabric TR appropriately and vigorously vibrate.
At the same time, it is necessary to match the positions of the left and right tube raw fabrics TR. If the positions do not match, when the left and right end surfaces of the tube raw fabric TR are bonded and crimped, there will be a step due to the displacement on the joint (bonding) surface, and if this remains as a step in the product, the bonding strength will be insufficient due to insufficient bonding. In the worst case, the joint surface may peel off while being used in the market.

Therefore, in order to prevent the occurrence of such a problem, the upper and lower, left and right molds 15 are sufficiently aligned before clamping the tube raw material TR, and the joint surfaces of the left and right tube raw material TR are aligned during vice. It is adjusted so that.
That is, prior to clamping and vise of the tube raw material TR, the parallelism and vertical position between the left and right upper molds 15 and between the left and right lower molds 15, and the parallelism and left and right positions between the upper and lower molds 15. Thus, the mold 15 is fixed to the arm 20 and the molding machine base 10 which are the mold fixing parts, respectively, so as to maintain the position-aligned state.

  However, when the positions of the upper, lower, left and right molds 15 are adjusted, a positional shift occurs between the mold 15 and the tube molding machine 1 (arm 20 or molding machine base 10). When this misalignment occurs, a step 18 is always generated between the mold 15, the arm 20, and the molding machine base 10, as shown in FIG. When the tube raw material TR is clamped in this state, the trace of the step 18 remains in the product tube even after the tube is formed, and the trace of the step 18 becomes a nucleus (air accumulation in the step causes the vulcanized tube There is a risk of product defects due to abnormalities appearing on the surface) and Chris (microscopic wrinkles formed on the surface of the tube after vulcanization due to steps).

In order to prevent the step 18 from remaining in the molded tube fabric TR, the clamp pressure at the time of crimping may be lowered. However, if the clamp pressure is lowered, the holding force of the tube fabric TR is insufficient, so A sufficient pressing force cannot be applied to the end face of the tube raw fabric TR, and the crimping is insufficient. In other words, this problem has a so-called trade-off relationship in which when one is improved, the other is worsened, and cannot be solved by a conventional tube molding machine.
Therefore, conventionally, as shown in FIG. 9, a tape T is applied to a step portion between the mold 15 and the arm 20 or the molding machine base 10 to prevent a step mark from remaining on the tube after molding. In addition, when the adjustment width of the upper, lower, left and right sides of the mold 15 exceeds a certain range, measures such as changing the mold 15 to a new one have been taken.

  However, in general, the tape T cannot absorb the step 18 completely, and it is inevitable that a step mark is generated in the tube raw fabric TR. In addition to this, when the tape T attached is peeled off, it may adhere to the tube raw material TR as a foreign material. If the tape T is molded without sticking, there is a risk that the mold raw material 15 may be scratched on the tube raw fabric TR and the appearance may be poor, or that it may become a core after molding and bear or chrysmal.

Japanese Patent Publication No. 2-9930

  The present invention has been made in view of the problem of the level difference caused by the position adjustment of the mold at the time of the conventional tube molding, and the object is to be molded even if the position of the mold is adjusted. Another object of the present invention is to provide a tube molding machine and a method for manufacturing a tube that are free from the occurrence of a shape defect or the like due to a level difference in the tube.

The present invention has a molded portion which is opposed to their respective vertical and horizontal, in the left and right sides, made of unvulcanized rubber member having a predetermined length disposed between molded portions disposed on the upper and lower clamping the end of the hollow body at the top and bottom of the molded part, the upper and lower by vice left and right molding portion vice means, tube forming machine to each other press bonding both end surfaces of said end portion of said hollow body of clamping The molding portion includes a die and a die fixing portion for fixing the die, and the die is positioned relative to the die fixing portion for position alignment of both ends of the hollow body. A mold cover piece that is fixed in a position-adjustable manner, extends in the extending direction of the hollow body, and covers the hollow body-facing surface of the mold fixing portion, and the hollow body is interposed via the mold. It is a tube forming machine to clamp.
In another aspect of the present invention, on each of the left and right sides of the molding parts arranged opposite to each other in the vertical and horizontal directions, an end of a hollow body made of an unvulcanized rubber member having a predetermined length is arranged between the molding parts arranged in the vertical direction. Then, the end portions of the arranged hollow body are clamped by the upper and lower molding portions, and the upper, lower, left and right molding portions are viseed by the vice means, thereby pressing both end surfaces of the clamped hollow body to each other. A method for manufacturing a tube for manufacturing a tube by joining, wherein in the molding part having a mold and a mold fixing part, the mold is positioned to align both ends of the hollow body; A step of fixing the position-adjusted die to the die fixing portion, and a die-covering piece extending in the extending direction of the hollow body of the die in the hollow body facing surface of the die fixing portion. And the hollow body is clamped through the mold. A method for producing a tube having a step of flop.

  According to the present invention, the mold is fixed so as to be position-adjustable with respect to the mold fixing portion for position alignment of both ends of the hollow body, and extends in the extending direction of the hollow body to fix the mold. The mold body cover piece covering the hollow body facing surface of the part is clamped, and the hollow body is clamped via the mold mold. Therefore, even if the position of the mold mold is adjusted, the mold mold and the set are set as before. The step with the mold fixing part is not exposed to the surface in contact with the hollow body. Therefore, there is no possibility that a defective appearance such as a bear or a chris will occur on the product tube after molding or after molding.

1 is a cross-sectional view schematically showing a tube forming machine according to a first embodiment. It is sectional drawing which expanded and showed the up-and-down metal mold | die after the position adjustment shown in FIG. It is sectional drawing which shows schematically the tube molding machine in 2nd Embodiment. In order to simplify the explanation, only the upper left molding part is taken as an example, and it is a comparative diagram for explaining the difference in each configuration. It is the figure which showed the dimension of the metal mold | die (FIG. 5A) of the implementation product 1 which concerns on 1st Embodiment, and the rubber lining (FIG. 5B) of the implementation product 2 which concerns on 2nd Embodiment with respect to the conventional product, FIG. 5C is a diagram showing the dimensions of the mold in the conventional product for comparison with the working products 1 and 2. It is the table | surface which put together and compared the dimension shown in FIG. 5 of the conventional product, the implementation product 1, and the implementation product 2. FIG. It is sectional drawing which showed the conventional tube molding machine roughly. It is the figure which expanded the principal part of FIG. It is sectional drawing of the conventional tube molding machine which stuck the tape on the level | step-difference part of a metal mold | die and a molding machine stand in order to ease a level | step difference.

Next, the tube forming machine 1 according to the first embodiment of the present invention will be described.
The structure of the tube forming machine according to the first embodiment is basically the same as that of the conventional one, but only the structure of the mold is different.
That is, FIG. 1 is a cross-sectional view schematically showing a tube forming machine 1 according to the first embodiment, FIG. 1A shows a state before the tube raw fabric TR, which is a hollow body, is mounted, and FIG. A state in which the fabric TR is attached is shown. In addition, the same number is attached | subjected to the same part as the conventional tube molding machine 1 already demonstrated.
A tube molding machine 1 according to the first embodiment includes left and right molding machine tables 10 installed on the floor and left and right arms 20 arranged on the upper side thereof, and is located above the opposing surface of the molding machine table 10. A recess 12 is formed downward from the upper end. The left and right lower molds 15a are respectively mounted in the recesses. In addition, rubber linings 30 are attached to the upper parts of the left and right lower molds 15a so as to face each other as in the prior art.

A recess 22 for receiving the upper left and right molds 15a is also formed below the opposing surface of the left and right upper arms 20, and a rubber lining 30 is attached to the lower part of the opposing surface of the upper left and right molds 15a. ing.
Here, the left and right lower molds 15a are formed flush with the upper surface thereof as shown in the drawing, and the tube raw material TR is extended so as to cover the upper surfaces of the left and right molding machine bases 10, which are the opposite surfaces of the tube raw material. The upper die cover piece 15b extending in the present direction is L-shaped in side view, and the upper left and right die 15a are also formed flush with the lower surface of the tube raw material TR. It has a lower mold cover piece 15b extending in the direction and covering the bottom surface of the left and right arms 20 which is the tube raw fabric facing surface.

  When the tube raw material TR is clamped in the tube molding machine 1, as shown in FIG. 1B, the upper and lower mold cover pieces 15b of the mold 15a cover the upper and lower surfaces of the arm 20 and the molding machine base 10 respectively. Yes. Therefore, the tube raw fabric TR contacts only the upper and lower mold cover pieces 15b of the mold 15a, and does not directly contact the arm 20 or the molding machine base 10.

FIG. 2 is an enlarged cross-sectional view of the upper and lower molds 15a after the position adjustment shown in FIG.
The mold 15a is fixed in a state of being adjusted in the recess 12 of the molding machine base 10 and the recess 22 of the arm 20. As is apparent from this figure, even if the position of the mold 15a is adjusted and the relative position between the arm 15 and the molding machine base 10 is changed, the tube raw fabric TR contacts with the contact surface of the mold 15a. Therefore, there is no step difference on the contact surface with the tube raw fabric TR as in the prior art. Therefore, the tube raw dough TR can be strongly clamped and vice strongly, so that the tube raw dough TR can be reliably joined. In addition, there is no risk of product defects such as molding scars and bears or Chris occurring in the tube after molding as in the prior art, and the joints of the tubes bear or Chris due to molding scars or molding scars, etc. There is no risk of peeling during use due to product defects.

Next, a second embodiment of the present invention will be described.
In the first embodiment, in order to eliminate the boundary between the left and right molding machine bases 10 and the left and right arms 20 and the mold 15a, which are mold fixing parts of the tube molding machine 1, from the contact surface of the tube raw fabric TR. The mold cover piece 15b is provided integrally with the mold 15a.
In this configuration, since the left and right molding machine bases 10 and the left and right arms 20 do not directly contact the tube raw material TR, there is no step in the molded tube.
However, since the rubber lining 30 is attached to the left and right upper molds 15a and the lower mold 15a, when the rubber lining 30 and the mold 15a are peeled off due to long-term use, there is a gap between the attached borders. There is a possibility that a gap or a step is formed, and the gap or the step may not be ignored.

  Therefore, in this embodiment, as shown in FIG. 3, in order to eliminate the boundary between the rubber lining 30a and the upper and lower molds 15a, the rubber lining 30a is used in the configuration of the mold 15a in the first embodiment. From the contact surface of the upper and lower rubber linings 30a with the tube raw fabric TR so as to cover the upper surface of the lower die 15a facing the tube raw fabric and the entire lower surface of the upper die 15a. A rubber lining cover piece 30b extending on the lower surface of the upper die 15a and the upper surface of the lower die 15a is provided.

In the present embodiment, when joining the ends of the tube raw fabric TR, the tube raw fabric TR contacts only the rubber lining 30a and does not contact the mold 15a. Therefore, not only the elimination of the level difference between the conventional mold 15 and the arm 20 of the tube molding machine 1 and the molding machine base 10, but also the influence of the boundary between the mold 15a and the rubber lining 30 in the first embodiment. Is completely resolved.
Therefore, even if the parallelism and the vertical and horizontal positions of the upper and lower and left and right molds 15a with respect to the arm 20 and the molding machine base 10 which are the mold fixing parts of the tube molding machine 1 are adjusted, molding marks and Or there is no risk of product defects such as Chris.

Next, a comparison result between the conventional product and the product of the present invention will be described for the tube molding machine.
FIG. 4 is a comparative view for explaining the difference in configuration with only the upper left molding part 3 as an example for the sake of simplicity.
4A shows a conventional product, FIG. 4B shows a product 1 according to the first embodiment, and FIG. 4C shows a product 2 according to the second embodiment. Each configuration is as described above.

FIG. 5 shows a comparison between the mold of the implementation product 1 according to the first embodiment (FIG. 5A) and the rubber lining of the implementation product 2 according to the second embodiment (FIG. 5B) in comparison with the conventional product of FIG. 4A. FIG. 5C is a diagram showing the dimensions of the mold in the conventional product in order to compare the dimensions with the conventional products. FIG. 6 is a table summarizing the dimensions shown in FIG. 5 for the conventional product, the working product 1 and the working product 2 in comparison.
Here, each of the mold 15a (FIG. 5A) and the rubber lining (FIG. 5B) is composed of a vertical member (mold body; rubber lining body) and a lateral member (mold cover piece; rubber lining cover piece). Each of the vertical members of the molds 15a of the products 1 and 2 is equal to that of the conventional product.
Further, the horizontal length from the right end of the vertical member of the mold to the upper left end of the horizontal member is W2, and the horizontal length from the right end of the vertical member of the mold to the lower left end of the horizontal member is W1 (practical product 1 FIG. 5A) or the lateral length from the right end of the vertical member of the rubber lining mold to the lower left end of the horizontal member is W1 (implemented product 2; FIG. 5B), and between the upper and lower surfaces of the horizontal member. Distance (height; implementation product 1; FIG. 5A), or distance between the upper surface and the lower surface of the transverse member of the mold + distance between the upper surface and the lower surface of the lateral member of the rubber lining (height; implementation product 2; FIG. 5B) ) Is H1.

The comparison of dimensions in this case is as shown in FIG. That is, as shown in FIG. 5C, when W1 and W2 of the conventional product are A, in the product 1 and product 2, W1 is A + 75 mm and W2 is A + 80 mm. That is, the length extending in the tube raw material TR direction of the mold with the mold cover piece (practical product 1) and the rubber lining cover piece (practical product 2), the lower piece is 75 mm, and the upper piece is 80 mm. The thickness (height) H1 of the mold cover piece (implemented product 1) and the mold cover piece and the rubber lining cover piece (second embodiment) is 5 mm. In this respect, since the conventional product does not have a mold cover piece in the first place, it is naturally zero.
That is, the dimensions of the working products 1 and 2 are not different from each other in the left-right direction, and slightly different from each other in the vertical direction. Therefore, it can be similarly applied to a conventional tube forming machine.

In addition, when comparing the conventional product with the working product 1 and the working product 2, as for the mold trace, the conventional product still has a mold trace due to a level difference. I couldn't.
The occurrence of defects such as poor appearance, bear, and Chris occurred in the past, but did not occur in Examples 1 and 2. Further, in terms of durability, that is, the operation time until the occurrence of failure, it was found that the implementation products 1 and 2 were superior to the conventional product, and the implementation product 2 was superior to the implementation product 1.
The reason for this is that in the embodiment product 1, there is no generation of mold marks, and therefore the frequency of replacement of the mold is less than in the conventional product. In the embodiment product 2, the die 15a and the rubber lining 30a This is because there are no steps or gaps due to peeling, and the frequency of replacement of molds is further reduced.
For W1 and W2, A + 15 mm ≦ W1, W2 ≦ A + 100 mm, and for H1, 2 mm ≦ H1 ≦ 10 mm can be easily applied to a conventional tube molding machine.
In the working products 1 and 2, even when W1 = W2, the corner (the corner in the broken line in FIG. 5) where the lower surface of the horizontal member abuts the side surface of the horizontal member is either tapered or rounded. But you can.

  According to the first and second embodiments described above, even if the positions of the left and right and upper and lower molds are finely adjusted, there is no level difference in the tube raw material, and thus the appearance of the product tube is poor, There is no risk of defects such as bear or Chris. Moreover, since measures such as attaching a tape to the stepped portion are unnecessary, the workability is improved as compared with the conventional tube forming machine. In addition, regardless of the range of fine adjustment of the mold, it is not necessary to renew the mold as in the conventional case, so that the cost can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Tube molding machine, 10 ... Molding machine stand, 12 ... Recess, 15, 15a ... Mold, 15b ... Mold cover piece, 18 ... Step, 20 ... -Arm, 22 ... recess, 30, 30a ... rubber lining, 30b ... rubber lining cover piece, T ... tape, TR ... tube raw fabric.

Claims (7)

Has a molded part which is arranged opposite it to the respectively vertical and horizontal, right and left on each side, the end of the hollow body made of unvulcanized rubber member having a predetermined length disposed between molded portions disposed on the upper and lower clamping the part at the upper and lower mold portions, said by vice in vice means vertical and horizontal molding portion, a tube molding machine to each other press bonding both end surfaces of said end portion of said hollow body of clamping,
The molding part includes a mold and a mold fixing part that fixes the mold.
The mold is fixed to the mold fixing portion so as to be position-adjustable for position alignment of both ends of the hollow body, and extends in the extending direction of the hollow body. A mold cover piece covering the opposite surface of the hollow body,
A tube molding machine for clamping the hollow body through the mold. In the tube molding machine according to claim 1,
A rubber lining is provided on the surface facing the other mold facing the mold in the left-right direction,
The rubber lining includes a rubber lining cover piece that extends in an extending direction of the hollow body and covers a surface facing the hollow body of the mold,
A tube molding machine that clamps the hollow body via the rubber lining. In the tube molding machine according to claim 1 or 2,
A tube molding machine in which the upper molding part is driven so as to come in contact with and separate from the lower molding part. In the tube molding machine according to any one of claims 1 to 3,
A tube molding machine in which the upper mold fixing part is constituted by an arm and the lower mold fixing part is constituted by a molding machine base. In the tube molding machine according to any one of claims 1 to 4,
Tube forming machine that is a tube for tires. On the left and right sides of the molding parts arranged opposite to each other in the vertical and horizontal directions, an end of a hollow body made of an unvulcanized rubber member having a predetermined length is arranged between the molding parts arranged in the vertical direction, and the hollow body is arranged. Are clamped by the upper and lower molding parts, and the upper, lower, left and right molding parts are viced by a vice means, whereby both ends of the end of the clamped hollow body are pressed and joined together to produce a tube. A method of manufacturing a tube,
In the molding part provided with a mold and a mold fixing part, the step of adjusting the position of the mold and aligning both ends of the hollow body;
Fixing the position-adjusted mold to the mold fixing portion;
A tube having a step of covering a hollow body facing surface of the mold fixing portion with a mold cover piece extending in an extending direction of the hollow body of the mold and clamping the hollow body via the mold; Production method. In the manufacturing method of the tube described in Claim 6,
A rubber lining cover piece is provided on the surface facing the other mold facing the left and right direction of the mold and extends in the extending direction of the hollow body and covers the hollow body facing surface of the mold. A method for producing a tube, comprising a step of clamping the hollow body through a rubber lining.

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