JP2011194794A - Mold positioning structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold positioning structure allowing a guide roller a proper rolling contact with a cylinder mold and preventing dew condensation of a gas or the like discharged from raw materials.SOLUTION: A guide roller 7 is arranged radially outside direction of the end opening 3 of a cylinder mold 111, in a mold positioning structure of centrifugal molding apparatus, wherein the mold positioning structure supports cylinder molds 111, 119 with rollers 107, 109 and rotates cylinder molds 111, 119 by a turning force delivered to rollers 107, 109 from a drive source, and the guide roller 7 performs a rolling contact with edges 117, 121 copying the rotation of cylinder molds 111, 119. The position where the guide roller 7 performs the rolling contact with edges 117, 121 is within a range of 30° in a circumferential direction of cylinder molds 111, 119 upward from the contact where rollers 107, 109 touch cylinder molds 111, 119.

Description

  The present invention relates to a mold positioning structure for performing centrifugal molding using a synthetic resin or the like as a raw material.

  Patent Document 1 describes centrifugal molding using a seamless product cylindrical mold. As shown in FIG. 6, the centrifugal molding apparatus 101 has two support shafts 103 extending in parallel to each other supported by a housing 105 and a plurality of rollers 107 and 109 provided on the two support shafts 103 respectively. The mold 111 is supported. A rotating machine connected to the support shaft 103 rotates the rollers 107 and 109 together with the support shaft 103, so that a rotational force having the center O as a fulcrum is transmitted to the cylindrical mold 111.

  In order to position the cylindrical mold 111 with respect to the rollers 107 and 109, the guide roller 115 is supported by a bracket 113 fixed to the casing 105 of the centrifugal molding apparatus 101, and the guide roller 115 is placed on the end surface 117 of the cylindrical mold 111. Attempts have been made to make rolling contact. FIG. 7 shows a cylindrical mold 119 having a larger diameter than the cylindrical mold 111. The cylindrical molds 111 and 119 are selected from a plurality of cylindrical molds having different diameters. When the cylindrical mold 111 is replaced with the cylindrical mold 119, the guide roller must be moved to the position represented by the virtual line 115 ′ in order to make the guide roller 115 roll and come into contact with the end surface 121 of the cylindrical mold 119.

  Alternatively, if the guide roller 123 is disposed between the rollers 107 and 109, the guide roller 123 can be brought into rolling contact with any of the end surfaces 117 and 121 of the cylindrical molds 111 and 119. However, when the induction heating of the cylindrical molds 111 and 119 is performed by the electromagnetic induction coil 125, the bracket 127 for bearing the guide roller 123 is located above the inner peripheral surface 129 of the cylindrical molds 111 and 119 for the reason described later. Protruding. Gas is released by heating the thermosetting resin introduced into the cylindrical molds 111 and 119 as a raw material. This gas directly condenses by directly striking the bracket 127 protruding upward from the inner peripheral surface 129, which causes dust and the like to adhere to the guide roller 123 and the bracket 127.

  The electromagnetic induction coil 125 is disposed between the rollers 107 and 109. This is because the difference between the distance from the cylindrical mold 111 to the electromagnetic induction coil 125 and the distance from the cylindrical mold 119 instead of the cylindrical mold 111 to the electromagnetic induction coil 125 is reduced. This is because both of the molds 111 and 119 can be induction-heated substantially equally. However, in order to place the bracket 127 of the guide roller 123 in a position lower than the inner peripheral surface 129 of the cylindrical molds 111 and 119, the electromagnetic induction coil 125 becomes an obstacle.

JP 2001-38750 A

  The present invention has been made in view of the above circumstances, and the object of the present invention is to allow the guide roller to appropriately roll and come into contact with the cylindrical mold, and to condense the gas etc. released from the raw material. It is an object of the present invention to provide a mold positioning structure that can prevent the above-described problem.

  According to the present invention, a cylindrical mold selected from a plurality of cylindrical molds having different diameters and having end faces around end openings is supported by a plurality of rollers spaced horizontally from each other, and the roller A mold positioning structure of a centrifugal molding apparatus for rotating the cylindrical mold by a rotational force input from a driving source, and on a radially outer side than an end opening of the cylindrical mold supported by the roller. A guide roller that rolls into contact with the end face following the rotation of the cylindrical mold is disposed.

  Further, the present invention provides a movable bracket having a central axis extending in a direction orthogonal to the axial direction of the cylindrical mold and supporting the guide roller so as to be rotatable around the central axis, and joining the movable bracket to the movable bracket. A rotary shaft extending in the axial direction of the cylindrical mold, and a bearing holder that rotatably supports the rotary shaft, and a position where the roller roller contacts the end surface of the guide roller is in contact with the cylindrical mold. It is the range within 30 degrees in the circumferential direction of the said cylindrical metal mold | die upwards from the direction.

  According to the mold positioning structure of the present invention, the guide roller that is in rolling contact with the end face of the cylindrical mold can be made to follow the rotation of the cylindrical mold. In other words, the posture of the guide roller in contact with the end surface of the cylindrical mold or the rotating direction of the guide roller can be made to coincide with the circumferential direction in which the cylindrical mold rotates. For this reason, even when a cylindrical mold selected from a plurality of cylindrical molds having different diameters is replaced with the roller of the centrifugal molding apparatus, there is an advantage that it is not necessary to move the guide roller as in the prior art. can get.

  According to the mold positioning structure according to the present invention, since the guide roller and the movable bracket can be arranged outside the end opening of the cylindrical mold in the radial direction, the synthetic resin introduced as a raw material into the cylindrical mold is used. Even if the gas is released, such a gas does not directly hit the guide roller, and adhesion of dust or the like due to condensation of the gas can be prevented in advance. Further, since the guide roller can be separated from the electromagnetic induction coil of the centrifugal molding apparatus, the installation of the guide roller is not limited by the electromagnetic induction coil.

  Furthermore, in the mold positioning structure according to the present invention, the position where the guide roller rolls into contact with the end surface of the cylindrical mold is within 30 ° in the circumferential direction of the cylindrical mold, upward from the contact point where the roller contacts the cylindrical mold. The range is set. For this reason, according to the mold positioning structure, regardless of the diameter of the cylindrical mold placed on the roller of the centrifugal molding apparatus, the posture of the guide roller in contact with the end surface of the cylindrical mold or the rotation direction of the guide roller The movable bracket pivots around the rotating shaft so that the slidable pitch coincides with the circumferential direction of the cylindrical mold. The effect of this is as described above.

The top view which abbreviate | omitted a part of centrifugal molding apparatus to which the metal mold | die positioning structure which concerns on embodiment of this invention was applied. (A) is the top view which fractured | ruptured the principal part of the metal mold | die positioning structure which concerns on embodiment of this invention, (b) is the side view. The YY sectional view taken on the line of FIG.2 (b). The schematic diagram of the centrifugal molding device explaining the range where the guide roller of the metallic mold positioning structure concerning the embodiment of the present invention is arranged. Schematic of the centrifugal molding apparatus explaining the effect | action of the metal mold | die positioning structure which concerns on embodiment of this invention. The top view which abbreviate | omitted a part of centrifugal molding apparatus to which the metal mold | die positioning structure of the prior art example was applied. The schematic diagram of the centrifugal molding apparatus explaining arrangement | positioning of the guide roller of the metal mold | die positioning structure of a prior art example.

  FIG. 1 shows an example in which a mold positioning structure 1 according to an embodiment of the present invention is applied to a centrifugal molding apparatus 101. The cylindrical mold 111 has an end face 117 around its end opening 3. When the distance between the two spindles 103 of the centrifugal molding apparatus 101 is [s], the diameter [d] of the cylindrical mold 111 is preferably d = 0.8 s to 1.5 s. This also applies to a cylindrical mold 119 described later.

  As shown in FIGS. 1 to 3, the mold positioning structure 1 includes a center shaft 5 extending in a direction orthogonal to the axial direction of the cylindrical mold 111 pointed by an arrow X, and guide rollers 7 around the center axis 5. A movable bracket 9 that is supported so as to be able to rotate, a rotary shaft 11 that is joined to the movable bracket 9 and extends in the axial direction of the cylindrical mold 111, and a bearing that is fixed to the casing 105 of the centrifugal molding apparatus 101 and is rotatable. The bearing holder 13 is provided.

  The movable bracket 9 has a tip metal fitting 15 that cantilever-supports the central shaft 5 fixed to the rotary shaft 11. The bearing holder 13 includes a base member 21 having a horizontal piece 17 and a hanging piece 19, a front end bearing member 23 fixed to the front end of the upper surface of the horizontal piece 17, and a rear member fixed to the rear end of the upper surface of the horizontal piece 17. An end bearing member 25, a restriction plate 27 fixed to the rotating shaft 11, and stoppers 29 and 31 fixed to the horizontal piece 17 just below the restriction plate 27 are provided.

  The base member 21 is fixed to a stay 33 whose drooping piece 19 protrudes horizontally from the housing 105 of the centrifugal molding apparatus 101. The stay 33 may be any one that can provide the guide roller 7 at a desired position together with the bearing holder 13 with respect to the rollers 107 and 109 of the centrifugal molding apparatus 101. It is preferable that the guide roller 7 is located at a position retracted several mm from the end surface 117 of the cylindrical mold 111. The rotating shaft 11 has enlarged diameter portions 35 and 37 formed in the axial direction. The diameter-expanded portions 35 and 37 abut against the front end bearing member 23 and the rear end bearing member 25, respectively, so that the rotation shaft 11 is prevented from retreating from the end surface 117 of the cylindrical mold 111 with respect to the base member 21.

  The restriction plate 27 is provided for the following reason. That is, the end fitting 15 shown in FIG. 1 is located on the outer side in the radial direction of the cylindrical mold 111 with respect to the inner peripheral surface 129 of the cylindrical mold 111. When the rotary shaft 11 rotates about 180 ° from this state, the tip metal fitting 15 protrudes inward in the radial direction of the cylindrical mold 111 from the inner peripheral surface 129. In order to prevent this, the angle at which the rotary shaft 11 can rotate is limited to a range from a position where the lower edge 39 of the restriction plate 27 is received by the stopper 29 to a position where the inclined edge 41 of the restriction plate 27 is received by the stopper 31. Has been. The restricting plate 27 also plays a role of restricting the rotation shaft 11 from advancing to the end surface 117 of the cylindrical mold 111 with respect to the base member 21. Reference numeral 43 indicates a bearing.

  As shown in FIG. 4, the position where the guide roller 7 is in rolling contact with the end surface 117 of the cylindrical mold 111 is a virtual line passing through the center O of the cylindrical mold 111 and the contact 45 where the roller 107 contacts the cylindrical mold 111. As a reference, it is preferable to set the angle [θ] within 30 ° or less in the circumferential direction of the cylindrical mold 111 toward the upper side of the contact point 45. Alternatively, with reference to an imaginary line passing through the center O ′ of the cylindrical mold 119 and the contact 47 where the roller 109 contacts the cylindrical mold 119, the circumferential direction of the cylindrical mold 119 is 30 ° or less toward the upper side of the contact 47. The position where the guide roller 7 rolls into contact with the end surface 121 of the cylindrical mold 119 may be determined in the range of the angle [θ].

  The range in which the guide roller 7 is in rolling contact with the respective end faces 117 and 121 of the cylindrical molds 111 and 119 is provided with dots in the drawing as long as the above condition [d = 0.8 s to 1.5 s] is satisfied. Can be defined within the area. Although the contacts 45 and 47 are distinguished for convenience of explanation, the rollers 107 and 109 are similar to each other, and it is determined which of the contacts 45 and 47 defines the above range when the present invention is implemented. It is a matter of choice.

  According to the mold positioning structure 1, since the movable bracket 9 is disposed on the outer side (downward) in the radial direction from the end openings 3 of the cylindrical molds 111 and 119, the cylindrical molds 111 and 119 are used as raw materials. Even if gas is released from the introduced synthetic resin, such gas does not directly hit the movable bracket 9, and adhesion of dust and the like due to dew condensation of the gas can be prevented in advance. Further, since the guide roller 7 can be installed at a position away from the electromagnetic induction coil 125, the arrangement of the movable bracket 9 is not limited by the electromagnetic induction coil 125 as in the prior art.

  Furthermore, according to the mold positioning structure 1, when the cylindrical mold 111 slides in the axial direction with respect to the rollers 107 and 109 and the end surface 117 of the cylindrical mold 111 comes into contact with the guide roller 7, the guide roller immediately. 7 rotates around the central axis 5. Then, when the movable bracket 9 rotates about the rotation shaft 11, the posture of the guide roller 7 or the rotation direction of the guide roller 7 coincides with the circumferential direction of the cylindrical mold 111.

  For example, when the guide roller 7 is in contact with the end surface 117 of the cylindrical mold 111, the movable bracket 9 has the axial direction of the central axis 5 aligned with the line segment OA shown in FIG. A line segment OA is an imaginary line passing through the center O of the cylindrical mold 111 and the center C of the guide roller 7. In this state, it is assumed that the centrifugal molding apparatus 101 is stopped and the cylindrical mold 111 is replaced with the cylindrical mold 119. When the operation of the centrifugal molding apparatus 101 is resumed and the end surface 121 of the cylindrical mold 119 comes into contact with the guide roller 7, the movable bracket 9 has an axial direction of the central axis 5 that is the center O ′ of the cylindrical mold 119 and the guide roller 7. 3 is rotated in the direction indicated by the arrow α with the rotating shaft 11 shown in FIG. 3 as a fulcrum until it coincides with a line segment O′B passing through the center C.

  As described above, the mold positioning structure 1 does not require the guide roller 7 to be moved each time the cylindrical mold is replaced with the rollers 107 and 109 of the centrifugal molding apparatus 101. Further, since the guide roller 7 is disposed above the roller 107 or the roller 109, the installation of the guide roller 7 is not limited by the electromagnetic induction coil 125.

  It should be noted that the present invention can be carried out in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Although FIG. 1 shows only one end face 117 of both ends of the cylindrical mold 111, another guide roller may be brought into rolling contact with the other end face of the cylindrical mold 111. In this case, another guide roller may be attached to the housing 105 of the centrifugal molding apparatus 101 via the bearing holder described above.

  The present invention is a technique useful for skillfully transferring a cylindrical mold to a centrifugal molding apparatus regardless of the use or material of the cylindrical mold.

  DESCRIPTION OF SYMBOLS 1 ... Mold positioning structure, 3 ... End opening, 5 ... Center axis, 7, 115, 123 ... Guide roller, 9 ... Movable bracket, 11 ... Rotating shaft, 13 ... Bearing holder, 15 ... End fitting, 17 ... Horizontal piece, 19 ... Drip piece, 21 ... Base member, 23 ... Front end bearing member, 25 ... Rear end bearing member 27 ... Restriction plate, 29, 31 ... Stopper, 33 ... Stay, 35, 37 ... Expanded diameter part, 39 ... Lower edge, 41 ... Inclined edge, 43 ... Bearings, 45, 47 ... contacts, 101 ... centrifugal molding apparatus, 103 ... support shaft, 105 ... housing, 107,109 ... rollers, 111,119 ... cylindrical mold, 113, 127 ... bracket, 117, 121 ... end face, 125 ... electromagnetic induction coil, 129 ... inner peripheral surface.

Claims (2)

A cylindrical mold selected from a plurality of cylindrical molds having different diameters and having end faces around the end opening is supported by a plurality of rollers spaced horizontally from each other, and the roller is supported by a driving source. A mold positioning structure of a centrifugal molding apparatus that rotates the cylindrical mold by an input rotational force,
A mold positioning structure characterized in that a guide roller that rolls and contacts the end face following the rotation of the cylindrical mold is arranged outside the end opening of the cylindrical mold supported by the roller in the radial direction. . A movable bracket having a central axis extending in a direction orthogonal to the axial direction of the cylindrical mold and supporting the guide roller so as to be rotatable around the central axis, and an axial direction of the cylindrical mold joined to the movable bracket And a bearing holder that rotatably supports the rotating shaft,
The position of rolling contact with the end face of the guide roller is within a range of 30 ° or less in the circumferential direction of the cylindrical mold from the contact point where the roller contacts the cylindrical mold upward. The mold positioning structure according to 1.

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