JPH11227009A - Positioning block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of burr and surface flows in a resin molded product by preventing occurrence of fine shift in the mating faces of a movable projected block and a fixed recessed block. SOLUTION: A positioning block for mating a fixed and movable molds of a resin mold with each other is constituted of the fixed recessed block 53 fixed to a fixed template 6 and the movable projected block 54 fixed to a movable template 14 and bolts 57, 58 are passed through both bank parts 53A, 53B of the fixed recessed block 53 to fix the block 54 to the fixing side of the resin mold and bolts 61, 62 are passed through both shoulder parts of the projected block 54 to fix the block 54 to the movable side of the resin mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning block for positioning an upper die and a lower die in a resin mold.

[0002]

2. Description of the Related Art Plastic molded articles have various shapes depending on the product to be used and the place where the product is used, and are manufactured in a shape suitable for the place of use. In the production of this plastic molded product, a resin mold is designed according to its shape, and a resin mold is produced for each product.

In this resin mold, the upper mold and the lower mold are engaged with each other as originally planned, and the upper mold and the lower mold are positioned so that the originally planned product can be molded when the molding resin is injected. It is important that this is done accurately. If the engagement between the upper mold and the lower mold is not performed accurately, a resin molded product molded by injecting the mold resin will be defective, and the yield will be reduced. Therefore, in a resin mold, when the fixed side (upper die) and the movable side (lower die) are engaged with each other, particularly when the fixed side nest and the movable side nest are engaged, the fixed side nest and the movable side nest Conventionally, a positioning block as shown in FIG. 9 has been attached so as to accurately perform the positioning of the engagement so that the mating surface does not become out of order. That is, as shown in FIG. 10, a conventional positioning block 100 is fixed to a fixed-side fixed template 200 and is formed in a concave shape, and a fixed-side concave block 101 fixed to a movable-side movable template 300 and protrudes. And the movable-side convex block 103 formed in a shape.

A bolt hole 102 for inserting a bolt 105 for fixing the fixed-side concave block 101 is formed substantially at the center of the concave portion of the fixed-side concave block 101 fixed to the fixed-side template 200. The hole 102 is a stupid hole for a bolt 105 fitted into the bolt hole 102, but a tap 107 is cut. Therefore, the fixed-side concave block 101 is fixed to the fixed-side template 20.
When the bolt 105 is mounted on the fixed side template 200, the bolt 105 is inserted into the bolt hole 102, but the bolt 105 and the tap 107 of the bolt hole 102 are not screwed into each other. Then, the fixed-side concave block 101 is attached to the fixed-side template 200 by tightening the bolt 105. This bolt hole 10
The tap 107 formed at 2 is used to remove the fixed-side concave block 101 attached to the fixed-side template 200. A bolt (not shown) for pulling out the fixed-side concave block is screwed to the tap 107. The fixed side concave block 101
Is detached from the fixed side template 200.

A bolt hole 104 for inserting a bolt 106 for fixing the movable-side convex block 103 is formed substantially at the center of the convex portion of the movable-side convex block 103 fixed to the movable-side mold plate 300. The bolt hole 104 is a stupid hole with respect to the bolt 106 fitted into the bolt hole 104, but the tap 108 is cut. Therefore, the movable-side convex block 103 is
When the bolt is mounted on the movable mold plate 300, the bolt 106 is inserted into the bolt hole 104, but the bolt 106 and the tap 108 of the bolt hole 104 are not screwed into each other. Then, the movable convex block 103 is attached to the movable mold plate 300 by tightening the bolt 106. This bolt hole 10
The tap 108 formed at 4 is used to remove the movable-side convex block 103 attached to the movable-side mold plate 300, and a bolt (not shown) for extracting the movable-side convex block is attached to the tap 108. The movable side convex block 103 is screwed up and the bolt is pulled up.
Is detached from the movable mold plate 300.

As described above, since the bolt 105 is inserted into the substantially concave portion of the fixed-side concave block 101, the hole for hook attachment formed on the side surface on the center axis of the fixed-side template 200 is fixed. The hole for fixing the fixed-side concave block formed in the side template 200 is buffered, and it is necessary to shift the mounting position of either the hole for fixing the hook or the hole for fixing the fixed-side concave block. The hole for hook installation is
Since the hook is inserted when the fixed side template 200 is lifted, it is difficult to displace it from the center axis. For this reason, conventionally, as shown in FIG. 11, the hole for fixing the concave block on the fixed side is formed so as to be shifted to a position that does not buffer the hole for attaching the hook.

Similarly, since the movable convex block 103 has a bolt 106 inserted into the approximate center of the convex portion, a hook mounting hole formed on a side surface on the center axis of the movable mold plate 300 is formed. The holes for fixing the movable-side convex block formed on the movable-side mold plate 300 are buffered, and it is necessary to shift either the mounting hole for the hook or the hole for fixing the movable-side convex block. is there. The hole for hook installation is
Since the hook is inserted when the movable mold plate 300 is lifted, it is difficult to shift the movable mold plate 300 from the center axis. For this reason, conventionally, as shown in FIG. 11, the hole for fixing the movable-side convex block is formed so as to be shifted to a position that does not buffer the hole for attaching the hook.

[0008]

The conventional positioning block 100 composed of the fixed-side concave block 101 and the movable-side convex block 103 has a central axis of the fixed-side mold plate 200 and the movable-side mold plate 300. Since each is disposed at a position shifted from the line, a slight deviation between the temperature gradient of the fixed-side concave block 101 and the temperature gradient of the movable-side convex block 103 is caused by the fixed-side concave block 101 and the movable-side convex block. It appears as a slight deviation of the mating surface of 103, which causes burrs on the resin molded product,
There is a problem that scratches are generated on the surface of the resin molded product.

Further, the fixed side concave block 101 is inserted into a bolt hole 102 formed substantially in the center of the concave portion, and the bolt 105 is screwed into the fixed side mold plate 200 to make the fixed side concave block 101 substantially concave. Since the fastening is fixed to the fixed-side template 200 at the center, stresses in the directions indicated by arrows A are applied to the bank portions 101A and 101B on both sides of the fixed-side concave block 101, and the fixed-side concave block 10
1 may be slightly deformed. When the fixed-side concave block 101 is deformed, the mating surfaces of the fixed-side concave block 101 and the movable-side convex block 103 do not fit at normal angles, and therefore do not exhibit the functions to be possessed.

[0010] An object of the present invention is to generate no burr on a resin molded product or to generate a flaw on the surface of a resin molded product without causing a slight shift in a mating surface between a movable-side convex block and a fixed-side concave block. And trying to get rid of it.

[0011]

According to a first aspect of the present invention, there is provided a positioning block for fixing a fixed side and a movable side of a resin mold at a predetermined position. A fixed-side concave block formed and a movable-side convex block fixed to the movable-side mold plate and formed in a convex shape, and bolts are passed through both bank portions of the fixed-side concave block to the fixed side of the resin mold. And a bolt is passed through both shoulders of the movable-side convex block so as to be fixed to the movable side of the resin mold. With this configuration, since the bolt holes for inserting the movable-side convex block and the bolt holes for inserting the fixed-side concave block do not buffer the holes for hook attachment, the fixed-side concave block and the movable-side convex block are not buffered. The positioning block composed of the fixed block and the movable template can be arranged on the central axis of the fixed template and the movable template, and the temperature gradient of the fixed concave block and the temperature gradient of the movable convex block are delicate. Even if there is a deviation, the thermal expansion occurs evenly from the center axis, so there is no deviation in the mating surface between the fixed concave block and the movable convex block, causing burrs on the resin molded product, It is possible to prevent the surface from being scratched. Further, the fixed-side concave block is fixed to the fixed-side mold plate on both sides using two bolts, and the movable-side convex block is fixed to the movable-side mold plate on both sides using two bolts. The inwardly directed stress is not applied to the banks on both sides of the fixed-side concave block, so that the fixed-side concave block can be prevented from being deformed, and the upwardly-directed stress is applied to the shoulders on both sides of the movable-side convex block. Since the movable-side convex block can be prevented from being deformed without being added, it is possible to prevent burrs from being generated on the resin molded product, and from generating scratches on the surface of the resin molded product.

According to a second aspect of the present invention, in the positioning block, a tap hole is formed in the fixed-side concave block so as to penetrate the concave portion. With this configuration, it is possible to easily remove the fixed-side concave block from the fixed-side template.

According to a third aspect of the present invention, in the positioning block, the movable side convex block is formed with a through-hole penetrating a convex portion from an upper surface to a lower surface. With this configuration, it is possible to easily remove the movable-side convex block from the movable-side mold plate.

[0014]

Embodiments of the present invention will be described below. In manufacturing a plastic molded product, a resin molding method is employed in which a resin is pressed into a resin mold that matches the shape of the plastic molded product. This resin molding method produces a large amount of plastic molded products in a short time by injecting molten resin into a mold manufactured to the same size as the product by machining at high temperature under high pressure, mechanical pressure, air pressure or hydraulic pressure. Plastic molding method.

FIGS. 1 to 5 show a resin mold to which a positioning block according to an embodiment of the present invention is applied.
1 is a front view of a resin mold, FIG. 2 is a plan view of a fixed side of the resin mold, FIG. 3 is a bottom view of a movable side of the resin mold, and FIG. 4 is a resin mold shown in FIG. FIG. Some of the parts shown in each figure may have lines that are not originally present on the part, but these are shown in relation to other parts. It is unique to the figure.

1 to 4, reference numeral 1 denotes a resin mold, which is composed of a fixed side 2 and a movable side 3.
The fixed side 2 includes a fixed side mounting plate 4, a runner stripper plate 5, and a fixed side template 6. The fixed side template 6 is mounted on the fixed side mounting plate 4 via the runner stripper plate 5. I have. Reference numeral 7 denotes a parting line where the fixed side 2 and the movable side 3 are separated. Reference numeral 8 denotes a locating ring, and the locating ring 8 is mounted on the fixed-side mounting plate 4 by a tightening bolt 9. Reference numeral 10 denotes a spool bush. The spool bush 9 is attached to the locate ring 8 by a tightening bolt 11.
Reference numeral 12 denotes a hook mounting tap hole formed in the fixed side template 6, and a hook 13 is mounted in the hook mounting tap hole 12.

The movable side 3 comprises a movable side mold plate 14, a spacer block 15, an upper ejector plate 16, a lower ejector plate 17, and a movable side mounting plate 18, and the movable side mold plate 14 is
And two ejector plates 16, 17 to the movable-side mounting plate 18. 19 is a return pin, 20 is a return pin spring, 21 is an ejector rod, and 22 is a tightening bolt. Reference numeral 23 denotes an ejector guide pin, which includes an ejector pin, an ejector guide bush, and a bolt. Reference numeral 24 denotes a support pillar, which includes a pillar and a bolt for stopping the pillar. 25 is a shoulder bolt, 2
Reference numeral 6 denotes a tap hole for hook attachment formed in the movable mold plate 14. The hook mounting tap hole 26 has a hook 27.
Is installed.

Reference numeral 28 denotes a core insert of the resin mold 1 and 29 denotes a product molding portion. The insert 28 can be divided into two parts in order to take out a resin molded product molded by pressurizing resin in the product molding part 29. Reference numeral 30 denotes a fixed nest fixed to the fixed mold plate 6 of the resin mold 1, and 31 denotes a resin mold 1.
The movable side nest fixed to the movable side mold plate 14 of FIG. 3
Reference numeral 2 denotes a parting line for separating the fixed nest 30 and the movable nest 31 and opening the core nest 28 in order to take out the resin molded product molded in the product molding section 29.

Reference numeral 33 denotes a temperature control passage which is a refrigerant (air, air, etc.) formed in the movable side insert 31 of the core insert 28 in the longitudinal direction.
Water, oil, etc.). Numeral 34 denotes a temperature control conduit, which is a conduit for communicating with the outside of the movable nest 31 of the core nest 28, and an O-ring 35 is provided between the members constituting the movable nest 31 of the core nest 28. Numeral 36 denotes a temperature control path, which is a product forming part 2 of the movable nest 31 of the core nest 28.
A coolant flow path for cooling the temperature in the vicinity of 9 has a flow path formed by a circular hole, and a partition plate is formed at the center to branch the flow path into two flows.

Reference numeral 37 denotes a slider which is slid to open the fixed nest 30 and the movable nest 31 of the core nest 28. Reference numeral 38 denotes a slide stop pin for stopping the slider 37 at a predetermined distance when the movable insert 31 of the core insert 28 is moved to open the core insert 28, and comprises a pin and a slide stopper. Reference numeral 39 denotes a locking block which locks the slider 37 of the core insert 28 so as not to move during resin molding, and performs positioning when locking the slider 37 to the fixed insert 30 of the core insert 28. The locking block 39 is fixed by bolts. 4
Numeral 0 denotes an angular pin, which determines the direction and how much the slider 37 is slid by moving the movable nest 31 when opening the core nest 28, and from the fixed nest 30 of the core nest 28 to the slider 37. It is hung and attached. 41 is an ejector pin, and core nest 2
After moving the movable side insert 31 of 8 and opening the core insert 28, the plastic product is protruded from the product forming section 29 and taken out. Reference numeral 42 denotes an ejector sleeve, which is a cylindrical component into which a center pin 43 is inserted. The center pin 43 is for forming a boss hole in a plastic product molded by the product molding unit 29. A fixed side nesting pin 44 is for forming a boss hole in the plastic product formed by the product forming section 29.

Reference numeral 45 denotes a runner gate lock pin, which is a gate for supplying molten resin to the product molding section 29, a sprue which is a processing hole connected to the gate, a runner which is a molten resin injection port, and a tip of which is attached to the runner. It is composed of a runner lock pin to be inserted, and is used to separate the solidified resin at the tip of the gate from the solidified plastic product. That is, when the molten resin is supplied from the runner to the product forming section 29 through the sprue and the gate, and the resin filled in the product forming section 29 is cooled and solidified to form a plastic product, the runner, the sprue and the gate are formed. The resin filled in the solidifies similarly. If the core nest 28 is opened in this state, the plastic product is stuck to the resin at the tip of the gate and moves to the fixed nest 30, making it difficult to separate the resin at the tip of the gate from the plastic product. Therefore, before opening the fixed side nest 30 and the movable side nest 31 of the core nest 28, the member on which the runner, sprue and gate are machined and the member with the runner lock pin with the tip inserted into the runner are attached. It is open. When the member on which the runner, sprue, and gate are processed and the member with the runner lock pin with the tip inserted into the runner are opened, the resin fixed to the tip of the runner lock pin by the runner lock pin is pulled out. The solidified resin filling the runner, sprue, and gate is pulled out, and the resin at the tip of the gate is separated from the plastic product. After that, the fixed side nest 3 of the core nest 28
If the zero and the movable side insert 31 are opened, the plastic product molded by the product molding part 29 will be moved to the movable side.

Reference numeral 46 denotes a tapered give liner, which is provided at a predetermined position without causing any displacement in the mating surface between the fixed insert 30 and the movable insert 31 when the fixed insert 30 and the movable insert 31 of the core insert 28 are closed. It is a member for positioning so as to be fixed to the.

Numeral 47 denotes a distance spacer. When the distance spacer 47 is placed with the elbow unit part mounting surface of the wall surface of the fixed side insert 30 of the resin mold 1 facing downward, the distance spacer 47 is placed on the resin mold 1. This protects the elbow unit parts, which are exposed and attached to the wall surface of the fixed side insert 30, from being broken by the load of the resin mold 1. 48
Is a core core provided with a product forming portion 29, 49 and 50 are slider guide rails, and 51 is a tension link. The pulling link 51 is forcibly operated when the movable side insert 31 opens the fixed side insert 30 of the resin mold 1 and includes a link and a mounting bolt.

Reference numeral 52 denotes a positioning block for assembling the fixed-side insert 30 and the movable-side insert 31 so that the mating surface of the fixed-side insert 30 and the movable-side insert 31 does not become out of alignment when the fixed-side insert 30 and the movable-side insert 31 are fitted together. belongs to. As shown in FIG. 5, the positioning block 52 is fixed to the fixed mold plate 6 on the fixed side 2 and formed in a concave shape, and is fixed to the movable mold plate 14 on the movable side 3 and has a convex shape. And the movable-side convex block 54 formed at the bottom.

Bolt holes 55, 56 for inserting bolts for fixing the fixed-side concave block 53 are formed in the bank portions 53A, 53B on both sides of the fixed-side concave block 53 fixed to the fixed-side template 6. As shown in FIG. 7, a bolt 57 is inserted into the bolt hole 55, and a bolt 58 is inserted into the bolt hole 56, and the fixed concave block 53 is fixed to the fixed template 6 by the bolts 57, 58. ing. Bolt holes 59 and 60 for inserting bolts for fixing the movable-side convex block 54 are formed in shoulders 54A and 54B on both sides of the movable-side convex block 54 fixed to the movable-side mold plate 14. A bolt 61 is inserted into the bolt hole 59, and a bolt 62 is inserted into the bolt hole 60 as shown in FIG. 7, and the movable convex block 54 is attached to the movable mold plate 14 by the bolts 61 and 62. Fixed. When the positioning block 52 engages the fixed-side concave block 53 and the movable-side convex block 54, a certain amount of clearance is formed between the bottom surface of the concave portion of the fixed-side concave block 53 and the upper surface of the convex portion of the movable-side convex block 54. It is formed to have. As shown in FIG. 5, the clearance between the bottom surface of the concave portion of the fixed-side concave block 53 and the upper surface of the convex portion of the movable-side convex block 54 is not so large as to be shown. It is about 0 mm.

When the fixed concave block 53 is attached to the fixed mold plate 6 and the movable convex block 54 is attached to the movable mold plate 14, a state as shown in FIG. 6 is obtained.

A tapped hole 63 is provided substantially at the center of the bottom surface of the concave portion of the fixed concave block 53 fixed to the fixed mold plate 6.
Are formed to penetrate. The tap holes 63 are for easily removing the fixed-side concave block 53 fixed to the fixed-side template 6 from the fixed-side template 6. The fixed-side concave block 53 once attached to the fixed-side template 6 is not often removed, but the fixed-side concave block 53 once attached to the fixed-side template 6 is removed for some reason (for example, the fixed-side concave block 53). (If part of the block is damaged)
This is used when it is necessary to replace the device. That is, the fixed-side concave block 53 is
When fixed to the fixed side template 6, the fixed side concave block 53 is fitted to the fixed side concave block fitting notch 65 formed on the fixed side template 6 and the bank portions 53 on both sides of the fixed side concave block 53.
A and 53B are fixed with bolts 57 and 58. The fixed-side concave block is fitted tightly into the fixed-side concave block fitting notch 65, and the fixed-side concave block 53 attached to the fixed-side template 6 is provided with bolts 57 and 58.
It cannot be easily removed simply by removing it. Therefore, when the fixed-side concave block 53 attached to the fixed-side template 6 is once removed, the bolts 57 and 58 of the fixed-side concave block 53 are removed, and then the bolt is screwed into the tapped hole 63. Is pressed against the fixed-side template 6 by further turning the fixed-side template 6 to move the fixed-side concave block 53 in a direction in which the fixed-side concave block 53 comes off.

The movable-side convex block 54 fixed to the movable-side mold plate 14 has a portion (specifically, a predetermined distance from the end of the movable-side mold plate 14) substantially at the center of the upper surface of the convex portion. ) A tap is formed, and a through hole 64 formed through the movable-side convex block 54 is formed. This through hole 64
This is for easily removing the movable side convex block 54 fixed to the movable side mold plate 14 from the movable side mold plate 14.
The movable-side convex block 54 once attached to the movable-side template 14 is not often removed, but the movable-side convex block 54 once attached to the movable-side template 14 may be removed for any reason (for example, movable This is used when it is necessary to replace the side protruding block when it is partially damaged. That is, when the movable-side convex block 54 is fixed to the movable-side mold plate 14, the movable-side convex block 54 is fitted into the movable-side convex block fitting notch 66 formed on the movable-side mold plate 14, and the movable The shoulders 54A, 54B on both sides of the side convex block 54 are fixed by bolts 61, 62. The fitting of the movable-side convex block 54 to the notch 66 for fitting the movable-side convex block is tight, and the movable-side convex block 54 attached to the movable-side mold plate 14 is
The bolts 61 and 62 cannot be easily removed simply by removing them. Therefore, when the movable convex block 54 attached to the movable mold plate 14 is once removed, the bolts 61 and 6 of the movable convex block 54 are removed.
2 is removed, and a bolt is screwed into a tap forming portion of the through hole 64. The tip of the bolt is brought into contact with the movable mold plate 14, and the movable mold plate 14 is pressed by turning the bolt further. This is performed by moving the convex block 54 in a direction in which it comes off.

As described above, according to the present embodiment, as shown in FIG. 8, when the fixed-side concave block 53 is attached to the fixed-side mold plate 6, there is no buffer in the hook hole 12 so that the fixed-side concave block 53 is provided on the center axis. Similarly, when attaching the movable side convex block 54 to the movable side mold plate 14, the hook holes 26
Therefore, even if the fixed side 2 and the movable side 3 of the resin mold 1 have different thermal expansions, they do not adversely affect the molded product.

[0030]

According to the first aspect of the present invention, the bolt holes for inserting the movable-side convex block and the bolt holes for inserting the fixed-side concave block do not buffer the holes for hook attachment. The positioning block composed of the fixed-side concave block and the movable-side convex block can be arranged on the center axis of the fixed-side mold plate and the movable-side mold plate. Even if there is a slight deviation from the temperature gradient of the block, thermal expansion occurs evenly from the center axis, so that there is no deviation in the mating surface between the fixed-side concave block and the movable-side convex block. The block is fixed to the fixed mold plate on both sides using two bolts, and the movable convex block is fixed to the movable mold plate on both sides using two bolts. Both The inwardly directed stress is not applied to the bank of the fixed block, so that the fixed-side concave block can be prevented from being deformed, and the upwardly-directed stress is not applied to the shoulders on both sides of the movable-side convex block. Since it is possible to prevent the side convex block from being deformed, it is possible to prevent burrs from being generated on the resin molded product and from generating scratches on the surface of the resin molded product.

According to the second aspect of the present invention, it is possible to easily remove the fixed-side concave block from the fixed-side mold plate.

According to the third aspect of the present invention, it is possible to easily remove the movable-side convex block from the movable-side mold plate.

[Brief description of the drawings]

FIG. 1 is a front view of a resin mold to which a positioning block according to the present invention is applied.

FIG. 2 is a plan view of the movable side of the resin mold shown in FIG.

FIG. 3 is a bottom view on the fixed side of the resin mold illustrated in FIG. 1;

FIG. 4 is a side view of the resin mold shown in FIG. 1;

FIG. 5 is a front view of a positioning block according to the present invention.

6 is a perspective view showing a state in which the positioning block shown in FIG. 5 is attached to a fixed mold plate and a movable mold plate.

FIG. 7 is an enlarged partial cross-sectional view showing a state where the positioning block shown in FIG. 5 is attached to the fixed mold plate and the movable mold plate, and the fixed concave block and the movable convex block are combined.

8 is an overall perspective view showing a fixed mold plate (movable mold plate) to which the positioning block shown in FIG. 5 is attached.

FIG. 9 is a front view of a conventional positioning block.

FIG. 10 is an enlarged partial cross-sectional view showing a state where the conventional positioning block shown in FIG. 9 is attached to a fixed mold plate and a movable mold plate, and a fixed concave block and a movable convex block are combined.

11 is an overall perspective view showing a fixed-side template (movable-side template) to which the conventional positioning block shown in FIG. 9 is attached.

[Explanation of symbols]

1 ………………………………………………………………………………………………………………… fixed side 3 ……… ……………………… Movable side 6 ………………………………………………………………………………………………………………………………………………………………………… ……………… Tap hole for hook attachment 13 ………………………………… Hook 14 ……………………………… ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… … Hook 28 ………………………… Nesting core 30 …………………………………………………………………………………… 31 …………………………………………………………………………………………………………………… Position Block 53 53 ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………… Shoulders 55, 56 ……………………………………………………… Bolt holes 57, 58 Bolts 59, 60 Bolts 61, 62 Bolt holes 61, 62 ………………… Bolt 63 …………………………… Tap hole 64 ……………………………………………… ……… Through hole 65 …………………………………………………………………………………………………………………………………………………… Notch for fitting convex block on movable side

Claims (3)

[Claims] 1. A positioning block for fixing a fixed side and a movable side of a resin mold at a predetermined position, the fixed block being fixed to the fixed side mold plate and being fixed to the fixed side concave block and being fixed to the movable side mold plate. And a movable convex block formed in a convex shape, and bolts are passed through both bank portions of the fixed concave block to the fixed side of the resin mold, and both shoulders of the movable convex block are formed. A positioning block characterized in that a bolt is passed through the portion and fixed to the movable side of the resin mold. 2. The positioning block according to claim 1, wherein the fixed-side concave block is formed with a tapped hole penetrating the concave section. 3. The positioning block according to claim 1, wherein the movable-side convex block has a through-hole formed in the convex portion so as to penetrate from an upper surface to a lower surface.