Positioning jig and method for positioning

Abstract

To achieve positioning when assembling a mold device including an intermediate mold with a rotating frame at a lower cost than when conducting by measuring a size of an outer shape of a mold.SOLUTION: A positioning jig 1 is arranged instead of a rotating frame of an intermediate mold 12 arranged between a stationary side mold 11 and an intermediate die 15 of the intermediate mold 12. For positioning the stationary side mold 11 and the rotating frame, at a position corresponding to an arrangement position of a guide pin provided in the stationary side mold 11 or the rotating frame, a through hole 105 is formed, the through hole 105 having the same or approximately the same diameter as the guide pin and the same orientation of the central axis. The through hole 105 slidably receives a jig pin that slidably penetrates a guide bush 112 to be engaged with the guide pin.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a positioning jig and a positioning method.

Background Art

[0002] As a mold device constituting an injection molding machine, there is one in which an intermediate mold is arranged between a fixed mold and a movable mold. Further, as an intermediate mold constituting the mold device, there is one having a rotating frame that moves while rotating between a position facing the fixed mold and a position facing the movable mold, and alternately performs mold opening and closing operations at each position (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a mold device in which an intermediate mold is arranged between a fixed mold and a movable mold, at the time of assembly, first, the position of the intermediate mold is aligned with the fixed mold that serves as a positioning reference and assembled. At this time, the deviation of the position of the intermediate mold with respect to the fixed mold is measured and adjusted, but the adjustment may be performed based on the result of measuring the outer dimensions of each of the fixed mold and the intermediate mold. However, in this case, since high precision is required for the outer dimensions of the molds constituting the mold device, it has been one of the factors contributing to increased costs. Further, when the intermediate mold has a rotating frame, the rotating frame existing between the fixed mold and the intermediate mold may become an obstacle to positioning. In contrast, a method of removing the rotating frame can be considered, but if the rotating frame, which is a component of the intermediate mold, is removed, the outer dimensions of the intermediate mold cannot be accurately measured.

[0005] An object of the present invention is to realize positioning when assembling a mold device including an intermediate mold having a rotating frame at a lower cost compared to the case where the positioning is performed by measuring the size of the outer shape of the mold.

Means for Solving the Problems

[0006] The present invention completed for such an object is disposed between a fixed-side mold and an intermediate mold of an intermediate mold, and is disposed in place of the rotating frame of the intermediate mold. A through hole having the same or substantially the same diameter as the guide pin and the same direction of the central axis is formed at a position corresponding to the arrangement position of the guide pin provided on the fixed-side mold or the rotating frame for positioning between the fixed-side mold and the rotating frame. The through hole is characterized in that a jig pin that slidably penetrates a guide bush that fits with the guide pin slidably penetrates therethrough, and is a positioning jig. Here, in a state where the positioning is correct, the other end of the jig pin with one end inserted into the guide bush can be inserted into the through hole, and in a state where the positioning is incorrect, the other end of the jig pin with one end inserted into the guide bush cannot be inserted. This may be a characteristic. Further, in a state where the positioning is correct, among the first jig pin and the second jig pin as two jig pins having the same diameter, the extension line of the central axis of the first jig pin inserted into the through hole and the extension line of the central axis of the second jig pin inserted into the guide bush coincide with each other, and in a state where the positioning is incorrect, the extension line of the central axis of the first jig pin inserted into the through hole and the extension line of the central axis of the second jig pin inserted into the guide bush are displaced. This may be a characteristic. Further, the guide pin may be provided on the rotating frame, and the guide bush may be provided on the fixed-side mold. Further, the present invention includes a step of disposing, in place of the rotary frame, a jig having through holes formed at positions corresponding to the arrangement positions of guide pins provided on the fixed die or the rotary frame for positioning the fixed die and the rotary frame, the through holes having the same or substantially the same diameter as the guide pins and having the same central axis orientation; and a step of attempting to insert a jig pin slidable between the guide bush fitted to the guide pin and the through hole. The present invention is characterized by being a positioning method including these steps.

Advantages of the Invention

[0007] According to the present invention, positioning when assembling a die device including an intermediate die having a rotary frame can be achieved at a lower cost compared to the case of performing the positioning by measuring the size of the outer shape of the die.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Configuration of Mold Apparatus> FIGS. 1(A) and (B) are schematic views showing the positional relationship of the molds constituting the mold apparatus 10 to which the positioning jig 1 (see FIGS. 4(A) and (B)) according to this embodiment is applied. FIG. 1(A) shows the state when the mold apparatus 10 during assembly is viewed from the top side to the bottom side in the vertical direction. FIG. 1(B) shows the state when the mold apparatus 10 during assembly is viewed in a direction orthogonal to the vertical direction.

[0010] The mold apparatus 10 shown in FIGS. 1(A) and (B) is a mold apparatus for injection blow molding. Injection blow molding refers to a molding method that performs injection molding (hereinafter referred to as "injection molding") and blow molding (hereinafter referred to as "blow molding") in two stages. In injection blow molding, first, in injection molding which is the first stage of molding, a preform which is an intermediate molded product is molded. Next, in blow molding which is the second stage of molding, high-pressure air is blown into the inside of the preform to stretch it, thereby molding the final molded product.

[0011] The mold apparatus 10 includes a fixed mold 11 for injection molding, a movable mold 13 for blow molding, and an intermediate mold 12 for injection molding and blow molding. The intermediate mold 12 is disposed between the fixed mold 11 and the movable mold 13. The mold apparatus 10 performs injection molding with the fixed mold 11 and the intermediate mold 12 closed, and performs blow molding with the intermediate mold 12 and the movable mold 13 closed.

[0012] Figures 1(A) and (B) show the center line 100 of the fixed die 11, which serves as a positioning reference when assembling the die apparatus 10. The center line 100 of the fixed die 11 extends in the left - right direction of the drawing, which is the direction in which the die apparatus 10 opens and closes. Hereinafter, the direction in which the die apparatus 10 opens and closes (the left - right direction of the drawing in Figures 1(A) and (B)) is referred to as the "first direction". Further, the right side of the drawing in the first direction is referred to as the "first side", and the left side of the drawing in the first direction is referred to as the "second side".

[0013] Among the directions orthogonal to the first direction, the up - down direction of the drawing in Figure 1(A) is referred to as the "second direction". Further, the lower side of the drawing in Figure 1(A) in the second direction is referred to as the "third side", and the upper side of the drawing in Figure 1(A) in the second direction is referred to as the "fourth side". Among the directions orthogonal to the first direction, the up - down direction of the drawing in Figure 1(B) is referred to as the "vertical direction". Further, the upper side of the drawing in Figure 1(B) in the vertical direction is referred to as the "heaven side", and the lower side of the drawing in Figure 1(B) in the vertical direction is referred to as the "earth side".

[0014] The intermediate die 12 is a die for performing injection molding and blow molding. The intermediate die 12 includes a rotating frame 14, an intermediate mold 15, a guide bar 16, and a shaft body 17. The rotating frame 14 is a die that alternately moves between a position facing the fixed die 11 and a position facing the movable die 13 by rotating around the shaft body 17. The intermediate mold 15 is a die that rotatably supports the rotating frame 14 via the guide bar 16. The guide bar 16 is a columnar member that removably supports the rotating frame 14 with its tip passing through the rotating frame 14. The shaft body 17 is a member that serves as the axis of the rotating frame 14 that rotates around itself. However, the shaft body 17 itself does not rotate.

[0015] The rotating frame 14 is provided with guide pins 142 for positioning relative to the fixed-side mold 11. The guide pins 142 are columnar members protruding toward the first side in the first direction on each of the third side and the fourth side in the second direction of the rotating frame 14. The guide pins 142 are fixed in a state of being fitted into through holes penetrating convex portions 141 provided on the square-column-shaped rotating frame 14. Note that the guide pins 142 only need to be fixed to the convex portions 141 of the rotating frame 14, and thus may be integrally formed with the convex portions 141 as a part of the rotating frame 14.

[0016] On each of the third side and the fourth side in the second direction of the fixed-side mold 11, guide bushes 112, which are through holes formed in a cylindrical shape for positioning relative to the rotating frame 14, are formed. The guide bushes 112 are through holes penetrating convex portions 111 provided on each of the third side and the fourth side in the second direction of the square-column-shaped fixed-side mold 11 in the first direction. The guide bushes 112 are formed so as to be fitted with the guide pins 142 of the rotating frame 14. That is, the guide bushes 112 are formed such that the diameter is the same as or slightly larger than the diameter of the guide pins 142.

[0017] Since the mold device 10 shown in FIGS. 1(A) and (B) is in the middle of assembly as described above, the fixed-side mold 11, the intermediate mold 12, and the movable-side mold 13 are in a separated state. The assembly of the mold device 10 is performed in a state where the extension line of the center line 200 of the intermediate mold 12 and the extension line of the center line 300 of the movable-side mold 13 are made to coincide with the extension line of the center line 100 of the fixed-side mold 11 serving as a reference for positioning.

[0018] Specifically, as shown in FIG. 1(B), the intermediate mold 12 and the movable-side mold 13 are installed in that order with a space therebetween on the second side in the first direction of the fixed-side mold 11 serving as a reference for positioning. At the installation locations of the intermediate mold 12 and the movable-side mold 13, movable members 18 composed of so-called linear guides, slide rails, etc., which enable the movement of the intermediate mold 12 and the movable-side mold 13 in the first direction, are installed in advance.

[0019] First, the operator positions the intermediate mold 12 relative to the fixed-side mold 11 and assembles the fixed-side mold 11 and the intermediate mold 12. Next, the operator positions the movable-side mold 13 relative to the intermediate mold 12 and assembles the intermediate mold 12 and the movable-side mold 13. Here, the adjustment during the positioning of the intermediate mold 12 relative to the fixed-side mold 11 is performed by arranging a positioning member such as a shim (not shown) between the intermediate mold 12 and the movable member 18. Similarly, the adjustment during the positioning of the movable-side mold 13 relative to the intermediate mold 12 is performed by arranging a positioning member between the movable-side mold 13 and the movable member 18. In this way, the mold device 10 is assembled.

[0020] Figures 1(A) and (B) show a state where the extension line of the center line 200 of the intermediate mold 12 and the extension line of the center line 300 of the movable-side mold 13 coincide with the extension line of the center line 100 of the fixed-side mold 11. That is, Figures 1(A) and (B) show the state of the mold device 10 after the positioning of the intermediate mold 12 relative to the fixed-side mold 11 and the positioning of the movable-side mold 13 relative to the intermediate mold 12 have been performed.

[0021] Figures 2(A) and (B) are views showing the state before starting the assembly of the fixed-side mold 11 and the intermediate mold 12. Figure 2(A) shows how the fixed-side mold 11 and the intermediate mold 12 look when viewed from the top side to the bottom side in the vertical direction. Figure 2(B) shows how the fixed-side mold 11 and the intermediate mold 12 look when viewed in a direction orthogonal to the vertical direction.

[0022] As described above, the assembly of the mold device 10 starts with the positioning of the intermediate mold 12 relative to the fixed-side mold 11. Figures 2(A) and (B) show a state where the intermediate mold 12 is installed on the second side in the first direction relative to the fixed-side mold 11 in order to position the intermediate mold 12 relative to the fixed-side mold 11.

[0023] In the states shown in FIGS. 2(A) and (B), the extension line of the center line 200 of the intermediate mold 12 does not coincide with the extension line of the center line 100 of the fixed-side mold 11. Specifically, as shown in FIG. 2(A), the extension line of the center line 200 of the intermediate mold 12 is slightly shifted to the fourth side in the second direction with respect to the extension line of the center line 100 of the fixed-side mold 11. Further, as shown in FIG. 2(B), the extension line of the center line 200 of the intermediate mold 12 is slightly shifted to the bottom side in the vertical direction with respect to the extension line of the center line 100 of the fixed-side mold 11.

[0024] If an attempt is made to assemble with the center line 200 of the intermediate mold 12 shifted with respect to the center line 100 of the fixed-side mold 11, the guide pin 142 of the rotary frame 14 and the guide bush 112 of the fixed-side mold 11 cannot be properly fitted together, and they interfere with each other and get damaged. For this reason, in the present embodiment, the following method is used to position the intermediate mold 12 with respect to the fixed-side mold 11.

[0025] <Positioning procedure> FIGS. 3 to 8 are diagrams showing the procedure for positioning the intermediate mold 12 with respect to the fixed-side mold 11 using the positioning jig 1 according to the present embodiment. In FIGS. 3 to 5, examples are shown in which the center line 100 of the fixed-side mold 11 and the center line 200 of the intermediate mold 12 do not deviate. Also, FIGS. 3(A), 4(A), and 5(A) show the states when the fixed-side mold 11 and the intermediate mold 12 are viewed from the top side to the bottom side in the vertical direction. Further, FIGS. 3(B), 4(B), and 5(B) show the states when the fixed-side mold 11 and the intermediate mold 12 are viewed in a direction orthogonal to the vertical direction.

[0026] When the operator positions the intermediate mold 12 with respect to the fixed mold 11 using the positioning jig 1 (see FIGS. 4(A) and 4(B)) according to this embodiment, first, the rotating frame 14 is removed from the intermediate mold 12. Specifically, as shown in FIGS. 1(A) and 1(B) described above, since the rotating frame 14 is detachably attached to the tip portion of the guide bar 16 of the intermediate mold 12, the operator removes the rotating frame 14 from the tip portion of the guide bar 16. FIGS. 3(A) and 3(B) show the state after the rotating frame 14 has been removed from the guide bar 16 of the intermediate mold 12.

[0027] The operator attaches the positioning jig 1 to the intermediate mold 12 with the rotating frame 14 removed. The positioning jig 1 is a jig in which two rectangular prism-shaped metal members are arranged on the first side and the second side in the first direction, and these members are joined in the first direction or integrally formed. The member arranged on the first side in the first direction is longer in the second direction than the member arranged on the second side. The positioning jig 1 is formed with through holes 102 through which bolts 103 for fixing itself to the intermediate mold 15 pass. In the positioning jig 1, the position where the through holes 102 for passing the bolts 103 are formed is not particularly limited as long as the positioning jig 1 can be stably fixed to the intermediate mold 15. In this embodiment, as shown in FIGS. 4(A) and 4(B), two through holes 102 for passing the bolts 103 are formed on the top side and the bottom side in the vertical direction near the center portion in the second direction of the positioning jig 1.

[0028] The operator inserts a bolt 103 having a male thread at its tip into the through hole 102 with the surface 101 on the second side in the first direction of the positioning jig 1 facing the surface 151 on the first side in the first direction of the intermediate mold 15, and screws it into the female thread of the bolt hole 152 provided in the intermediate mold 15 in advance. Thereby, the positioning jig 1 is attached to the intermediate mold 15 of the intermediate mold 12. FIGS. 4(A) and 4(B) show the state when the positioning jig 1 is attached to the intermediate mold 15 of the intermediate mold 12.

[0029] Although not shown in the drawings, the diameter of the inlet portion of the through hole 102 (the portion on the first side in the first direction of the positioning jig 1) is larger than the diameter of the head of the bolt 103. Further, the diameter of the outlet portion of the through hole 102 (the portion on the second side in the first direction of the positioning jig 1) is smaller than the diameter of the head of the bolt 103 and larger than the diameter of the shaft portion of the bolt 103. Therefore, with the positioning jig 1 attached to the intermediate die 12 using the bolt 103, the head of the bolt 103 does not protrude toward the first side from the surface 106 on the first side in the first direction of the positioning jig 1.

[0030] The positioning jig 1 is formed with a through hole 105 for positioning with respect to the fixed die 11. The position where the through hole 105 is formed in the positioning jig 1 is extremely limitedly determined in order to perform positioning with high accuracy. Specifically, the through hole 105 is formed at a position that strictly corresponds to the arrangement position of the guide pins 142 of the rotary frame 14 (see FIGS. 1(A) and (B)). Here, the so-called "corresponding" specifically means that the position of the guide pin 142 of the rotary frame 14 with respect to the guide bush 112 in the state of being attached to the intermediate die 15 coincides with the position of the through hole 105 of the positioning jig 1 with respect to the guide bush 112 in the state of being attached to the intermediate die 15 instead of the rotary frame 14.

[0031] FIG. 5(A) shows an example of the configuration of the guide pin 142 provided on the rotary frame 14. FIG. 5(B) shows an example of the configuration of the through hole 105 provided on the positioning jig 1. The through hole 105 provided on the positioning jig 1 is a through hole that penetrates the convex portions 104 formed on each of the third side and the fourth side in the second direction of the positioning jig 1 in the first direction. Note that FIG. 5(B) shows the through hole 105 that penetrates the convex portion 104 provided on the third side in the second direction of the positioning jig 1.

[0032] The through-hole 105 of the positioning jig 1 is designed such that the diameter d2 is the same as or approximately the same as the diameter d1 of the guide pin 142 (see Fig. 5(A)). For this reason, the through-hole 105 allows the jig pin 2 for positioning work (see Fig. 7) described later to pass through it slidably. Further, the positioning jig 1 is designed such that the central axis 400 of the guide pin 142 in the state where the rotary frame 14 is attached to the intermediate mold 12 coincides with the central axis 500 of the through-hole 105 in the state where the positioning jig 1 is attached to the intermediate mold 12 instead of the rotary frame 14.

[0033] When the operator attaches the positioning jig 1 to the intermediate mold 12, the operator approaches the intermediate mold 12 with the positioning jig 1 attached to the fixed-side mold 11. Specifically, the intermediate mold 12 with the positioning jig 1 attached is moved from the second side in the first direction toward the first side to approach the fixed-side mold 11. Figs. 6(A) and (B) show the state when the intermediate mold 12 is approaching the fixed-side mold 11.

[0034] When the intermediate mold 12 is approached to the fixed-side mold 11, as shown in Fig. 7, a gap is formed between the through-hole 105 of the positioning jig 1 and the guide bush 112 of the fixed-side mold 11. The operator inserts the jig pin 2 from the first side in the first direction toward the second side of the guide bush 112 of the fixed-side mold 11. The jig pin 2 is a columnar jig separately manufactured such that the diameter is the same as or approximately the same as that of the guide pin 142 of the rotary frame 14 (see Figs. 1(A) and (B)), and the central axis 700 is a straight line. The jig pin 2 can be fitted into the guide bush 112 of the fixed-side mold 11 and pass through it while sliding the guide bush 112 as it is.

[0035] The operator further moves the jig pin 2 that has passed through the guide bush 112 of the fixed-side mold 11 in the first direction and attempts to fit it into the through-hole 105 of the positioning jig 1 as it is. That is, the operator attempts to fit the other end of one jig pin 2 into the through-hole 105 of the positioning jig 1 while the one end is fitted into the guide bush 112 of the fixed-side mold 11.

[0036] If the positioning of the intermediate mold 12 with respect to the fixed mold 11 is in a correct state, the extension line of the central axis 700 of the jig pin 2 coincides with the extension line of the central axis 500 of the through hole 105. In this case, the operator can fit one end of the single jig pin 2 into the guide bush 112 of the fixed mold 11 and the other end into the through hole 105 of the positioning jig 1.

[0037] On the contrary, if the positioning of the intermediate mold 12 with respect to the fixed mold 11 is not in a correct state, the extension line of the central axis 700 of the jig pin 2 does not coincide with the extension line of the central axis 500 of the through hole 105. In this case, with one end of the single jig pin 2 fitted into the guide bush 112 of the fixed mold 11, the other end cannot be fitted into the through hole 105 of the positioning jig 1.

[0038] If the positioning of the intermediate mold 12 with respect to the fixed mold 11 is not in a correct state, the operator performs an operation to adjust the position of the intermediate mold 12 with respect to the fixed mold 11. Specifically, first, the operator moves the intermediate mold 12 in a state close to the fixed mold 11 toward the second side in the first direction to separate the fixed mold 11 and the intermediate mold 12, thereby forming a working space of about several centimeters to several tens of centimeters between the fixed mold 11 and the intermediate mold 12.

[0039] Next, as shown in Fig. 8(A), the operator inserts a jig pin 21 into the through hole 105 of the positioning jig 1 and a jig pin 22 into the guide bush 112 of the fixed mold 11. At this time, the jig pins 21 and 22 may be inserted from the first side to the second side in the first direction or from the second side to the first side in the first direction. Then, the operator slides the jig pin 21 with respect to the through hole 105 toward the first side in the first direction and slides the jig pin 22 with respect to the guide bush 112 toward the second side in the first direction to bring the jig pin 21 into contact with the jig pin 22. Fig. 8(A) shows the state immediately before the jig pin 21 contacts the jig pin 22.

[0040] The operator brings into contact the surface 211 at the end on the first side in the first direction of the jig pin 21 and the surface 221 at the end on the second side in the first direction of the jig pin 22. Then, the operator uses a measuring instrument such as a dial gauge to measure the amount of deviation of the central axis at the contact portion between the jig pin 21 and the jig pin 22. Specifically, as shown in FIG. 8(B), the amount of deviation in the positions of the central axis 701 of the jig pin 21 and the central axis 702 of the jig pin 22 is measured. Thereby, the operator can quantitatively grasp the direction and degree of the deviation in the position of the intermediate mold 12 with respect to the fixed-side mold 11. The deviation in position can occur not only in the vertical direction and the second direction but also at any angle of 360°. Note that FIG. 8(B) shows the amount of deviation x in the vertical direction.

[0041] Based on the direction and degree of the position deviation quantitatively grasped, the operator adjusts the arrangement position and quantity of the position adjustment members arranged between the intermediate mold 12 and the movable member 18. Thereby, the deviation in the position of the intermediate mold 12 with respect to the fixed-side mold 11 is corrected. The operator repeatedly performs the operation of bringing the jig pin 21 and the jig pin 22 into contact to measure the position deviation and the operation of adjusting the arrangement position and quantity of the position adjustment members, thereby positioning the intermediate mold 12 with respect to the fixed-side mold 11. Thereby, it becomes possible to assemble the fixed-side mold 11 and the intermediate mold 12 in a state where the positioning of the intermediate mold 12 with respect to the fixed-side mold 11 is correct.

[0042] When the positioning of the intermediate mold 12 with respect to the fixed mold 11 is completed, the operator positions the movable mold 13 (see FIG. 1) with respect to the intermediate mold 12. In positioning the movable mold 13 with respect to the intermediate mold 12, the same method as that for positioning the intermediate mold 12 with respect to the fixed mold 11 can be used. That is, although not shown, the positioning jig 1 according to the present embodiment is disposed between the intermediate mold 12 in a state where the rotating frame 14 is removed and the movable mold 13, and positioning is performed using one or more jig pins 2. As a result, the intermediate mold 12 and the movable mold 13 can be assembled in a state where the positioning of the movable mold 13 with respect to the intermediate mold 12 is correct. As a result, the mold device can be assembled with the extension lines of the center lines of the fixed mold 11, the intermediate mold 12, and the movable mold 13 aligned with each other.

[0043] Summarizing the above, the positioning jig to which the present invention is applied only needs to have the following configuration and can take various embodiments. That is, the positioning jig 1 according to the present embodiment is disposed between the fixed mold 11 and the intermediate mold 15 of the intermediate mold 12, and is disposed in place of the rotating frame 14 of the intermediate mold 12. A through hole 105 having the same or substantially the same diameter as the guide pin 142 and the same direction of the central axis is formed at a position corresponding to the arrangement position of the guide pin 142 provided on the fixed mold 11 or the rotating frame 14 for positioning between the fixed mold 11 and the rotating frame 14. The through hole 105 is a positioning jig characterized in that a jig pin 2 that slidably penetrates a guide bush 112 that fits with the guide pin 142 slidably penetrates therethrough.

[0044] As a result, the through-hole 105 formed in the positioning jig 1 is disposed at a position corresponding to the arrangement position of the guide pin 142, enabling the jig pin 2 that slidably penetrates the guide bush 112 to slide. As a result, an operator can check for any misalignment in the position of the intermediate mold 12 relative to the fixed-side mold 11 by attempting to fit one end of a single jig pin 2 into the guide bush 112 and then trying to fit the other end into the through-hole 105. Further, the operator can quantitatively grasp the magnitude of the misalignment in the position of the intermediate mold 12 relative to the fixed-side mold 11 by inserting the jig pins 21 and 22 into the guide bush 112 and the through-hole 105 respectively, bringing the jig pins 21 and 22 into contact, and measuring the magnitude of the misalignment. Additionally, it becomes possible to measure the parallelism between the fixed-side mold 11 and the intermediate mold 12.

[0045] Here, the through-hole 105 may be characterized in that the other end of the jig pin 2 with one end inserted into the guide bush 112 can be inserted when the positioning between the fixed-side mold 11 and the rotary frame 14 is correct, and the other end of the jig pin 2 with one end inserted into the guide bush 112 cannot be inserted when the positioning between the fixed-side mold 11 and the rotary frame 14 is incorrect. As a result, an operator can easily determine that the positioning is correct if the other end of a single jig pin 2 can be fitted into the through-hole 105 with one end fitted into the guide bush 112, and that the positioning is incorrect if it cannot be fitted.

[0046] Also, in a state where the positioning between the fixed-side mold 11 and the rotary frame 14 is correct, among the jig pin 21 which is the first jig pin and the jig pin 22 which is the second jig pin, both being two jig pins having the same diameter, the extension line of the central axis 701 of the jig pin 21 inserted into the through-hole 105 and the extension line of the central axis 702 of the jig pin 22 inserted into the guide bush 112 coincide. In a state where the positioning between the fixed-side mold 11 and the rotary frame 14 is incorrect, the extension line of the central axis 701 of the jig pin 21 inserted into the through-hole 105 and the extension line of the central axis 702 of the jig pin 22 inserted into the guide bush 112 are displaced. This may be a characteristic feature. Accordingly, the operator can insert the jig pins 21 and 22 into the guide bush 112 and the through hole 105 respectively, bring the jig pins 21 and 22 into contact with each other, and measure the magnitude of the displacement, thereby quantitatively grasping the magnitude of the displacement of the intermediate mold 12 relative to the fixed-side mold 11.

[0047] Further, the guide pin 142 may be provided on the rotating frame 14, and the guide bush 112 may be provided on the fixed-side mold 11. Accordingly, the through hole 105 of the positioning jig 1 arranged in place of the rotating frame 14 of the intermediate mold 12 is arranged at a position corresponding to the arrangement position of the guide pin 142 of the rotating frame 14, and the jig pin 2 that slidably penetrates the guide bush 112 of the fixed-side mold 11 is made slidable. As a result, the operator can confirm the presence or absence of displacement by attempting to fit one end of one jig pin 2 into the guide bush 112 and the other end into the through hole 105. Further, the operator can insert the jig pins 21 and 22 into the guide bush 112 and the through hole 105 respectively, bring the jig pins 21 and 22 into contact with each other, and measure the magnitude of the displacement, thereby quantitatively grasping the magnitude of the displacement of the intermediate mold 12 relative to the fixed-side mold 11.

[0048] Further, the positioning method to which the present invention is applied only needs to have the following configuration and can take various embodiments. That is, the positioning method according to the present embodiment includes a step of arranging a positioning jig 1 having a through hole 105 formed at a position corresponding to the arrangement position of the guide pin 142 provided on the fixed-side mold 11 or the rotating frame 14 for positioning the fixed-side mold 11 and the rotating frame 14, the through hole 105 having the same or substantially the same diameter as the guide pin 142 and the same central axis orientation, in place of the rotating frame 14, and a step of attempting to insert one or more jig pins slidable with respect to the guide bush 112 that fits with the guide pin 142 and the through hole 105 into the guide bush 112 and the through hole 105 respectively.

[0049] Thus, the operator can check for misalignment by attempting to fit the other end of one jig pin 2 into the through-hole 105 with one end of the jig pin 2 fitted into the guide bush 112. Further, the operator can quantitatively grasp the magnitude of misalignment of the intermediate mold 12 with respect to the fixed-side mold 11 by inserting jig pins 21 and 22 into the guide bush 112 and the through-hole 105 respectively, bringing the jig pins 21 and 22 into contact, and measuring the magnitude of misalignment. Furthermore, it is also possible to measure the parallelism between the fixed-side mold 11 and the intermediate mold 12.

[0050] <Others> As described above, the embodiments of the present invention have been explained, but the present invention is not limited to the above-described embodiments. Also, the effects of the present invention are not limited to those described in the above embodiments. For example, the configurations of the positioning jig 1 shown in FIGS. 4(A) and (B) are merely examples for achieving the object of the present invention and are not particularly limited.

[0051] For example, in the above-described embodiment, the guide pin 142 is provided on the rotating frame 14 of the intermediate mold 12 and the guide bush 112 is provided on the fixed-side mold 11, but the present invention is not limited to this. The guide pin 142 may be provided on the fixed-side mold 11 and the guide bush 112 may be provided on the rotating frame 14. That is, the positional relationship between the guide pin 142 and the guide bush 112 in the fitting relationship may be reversed. However, when the positional relationship between the guide pin 142 and the guide bush 112 is reversed, the positioning jig 1 is attached in place of the mold member (for example, the cavity plate) having the guide pin 142 in the fixed-side mold 11.

[0052] Also, in the above-described embodiment, the operator manually performs the operation of inserting the jig pin 2 into the through-hole 105 of the positioning jig 1 and the guide bush 112 of the fixed-side mold 11, but this operation may be performed automatically.

[0053] In addition, in the above-described embodiment, the positioning jig 1 is fixed to the intermediate mold 15 by passing only the bolt 103 through the through hole 102 of the positioning jig 1, but the present invention is not limited to this. For example, a configuration in which the positioning jig 1 is fixed to the intermediate mold 15 using a spacer block and a bolt (not shown) may be employed. Thereby, compared with the case where the positioning jig 1 is fixed to the intermediate mold 15 using only the bolt 103, the risk of damage or the like that may occur when the fixed-side mold 11 comes into contact with the rotating frame 14 can be reduced.

Explanation of Reference Numerals

[0054] 1... Positioning jig, 2, 21, 22... Jig pins, 10... Mold apparatus, 11... Fixed-side mold, 12... Intermediate mold, 13... Movable-side mold, 14... Rotating frame, 15... Intermediate mold, 16... Guide bar, 17... Shaft body, 18... Movable member, 105... Through hole, 112... Guide bush, 142... Guide pin

Claims

1. It is arranged between a fixed mold and an intermediate mold of an intermediate mold, and is arranged in place of a rotating frame of the intermediate mold. At a position corresponding to the arrangement position of a guide pin provided on the fixed mold or the rotating frame for positioning between the fixed mold and the rotating frame, a through hole having the same or substantially the same diameter as the guide pin and the same direction of the central axis is formed. The through hole is characterized in that a jig pin that slidably penetrates a guide bush that fits with the guide pin is slidably penetrated. Positioning jig.

2. The through hole is characterized in that, in a state where the positioning is correct, the other end of the jig pin with one end inserted into the guide bush can be inserted, and in a state where the positioning is incorrect, the other end of the jig pin with one end inserted into the guide bush cannot be inserted. The positioning jig according to Claim 1.

3. In a state where the positioning is correct, among the first jig pin and the second jig pin as two jig pins having the same diameter, the extension line of the central axis of the first jig pin inserted into the through hole and the extension line of the central axis of the second jig pin inserted into the guide bush coincide. In a state where the positioning is incorrect, the extension line of the central axis of the first jig pin inserted into the through hole and the extension line of the central axis of the second jig pin inserted into the guide bush are displaced. It is characterized by that. The positioning jig according to Claim 1.

4. The guide pin is provided on the rotating frame, and the guide bush is provided on the fixed mold. It is characterized by that. The positioning jig according to Claim 2.

5. A step of arranging, in place of the rotating frame, a jig in which a through hole having the same or substantially the same diameter as the guide pin and the same direction of the central axis is formed at a position corresponding to the arrangement position of the guide pin provided on the fixed mold or the rotating frame for positioning between the fixed mold and the rotating frame. A step of attempting to insert one or a plurality of jig pins that can slide with respect to the guide bush that fits with the guide pin and the through hole into each of the guide bush and the through hole. A positioning method characterized by including that.

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