CN220297758U

CN220297758U - Special-shaped waterway structure for injection mold

Info

Publication number: CN220297758U
Application number: CN202321991772.7U
Authority: CN
Inventors: 徐险忠; 贾旭佳
Original assignee: Kunshan Beisong Precision Electronics Co ltd
Current assignee: Kunshan Beisong Precision Electronics Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-01-05
Anticipated expiration: 2033-07-27

Abstract

The utility model discloses a special-shaped waterway structure for an injection mold, which comprises a mold core fixing plate, wherein the mold core fixing plate is formed by combining a first mold plate and a second mold plate, a first waterway groove of the special-shaped structure is formed in the side surface of the first mold plate, which is close to the second mold plate, both ends of the first waterway groove are connected with waterway inlets and outlets, a circle of first sealing ring grooves are formed in the first mold plate along the periphery of the first waterway groove at intervals, sealing rings are embedded in the first sealing ring grooves, two waterway inlets and outlets are connected with waterway joints, and a second waterway groove matched with the first waterway groove is formed in the second mold plate. The beneficial effects of the utility model are as follows: the waterway runner can be designed according to the structure of the product, the path is not limited, the product is ensured to be heated uniformly and stably in the injection molding process, the product is prevented from being deformed due to uneven heating, the production efficiency and the yield of the product are improved, and the injection molding requirements of products with different structures can be met; the waterway structure has simple manufacturing process and low manufacturing cost.

Description

Special-shaped waterway structure for injection mold

Technical Field

The utility model relates to the technical field of injection molds, in particular to a special-shaped waterway structure for an injection mold.

Background

The injection mold is a tool for producing plastic products, is mainly used for mass production, and can conveniently and rapidly provide complete structures and accurate dimensions for plastic products. Injection molding is a processing method used for mass production of parts with complex shapes, and the working principle is as follows: and pushing the heated and melted plastic raw material by a screw rod of an injection molding machine to inject the heated and melted plastic raw material into a die cavity of a plastic die under high pressure, and cooling and solidifying the heated and melted plastic raw material to obtain a plastic molding product. The injection molding method has the advantages of high production speed, high efficiency, automation in operation, multiple patterns, various shapes, large size, accurate product size, easy updating of the product, and capability of forming parts with complex shapes, and is suitable for the field of mass production, products with complex shapes and other molding processing.

In an injection mold, a waterway system is a core part of the injection mold, has important influences on the service life of the mold and the production efficiency and quality of injection products, and the design of an injection waterway structure is a key for improving the quality of injection products and improving the injection molding efficiency. The water path in the existing injection mold refers to a penetrating water path hole which is machined in a plastic mold frame and a mold core fixing plate and continuously circulates inside through a certain medium (such as water and oil). However, the water passage holes are limited by the processing conditions, and are generally linear structures and conventional water passage structures. However, for the waterway needing the special-shaped structure, the conventional waterway structure cannot be uniformly arranged on the periphery of the cavity of the die core in the injection molding operation of the special-shaped or irregular-structured product, so that heat transfer is uneven easily, the product is deformed easily due to uneven heat in the injection molding process, the size of the high-precision product cannot be fine, and the yield and the production efficiency are greatly influenced, so that the production requirements of customers cannot be met. Some customers use 3D printing to process special-shaped waterways in order to solve the problem, but the cost price of 3D printing is high and the practical service life of a die printed by the special-shaped waterway is relatively low due to the influence of materials, and still the requirements of customers cannot be met.

Disclosure of Invention

The utility model aims to provide a special-shaped waterway structure for an injection mold, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an injection mold is with dysmorphism water route structure, includes the mould benevolence fixed plate, the mould benevolence fixed plate is formed by first template and second template combination, the first water channel groove of dysmorphism structure has been seted up to the side that is close to the second template of first template, the both ends in first water channel groove all are connected with a water route and import and export, every the water route import and export all penetrate the inside of first template and wear out with the adjacent side that is equipped with the side in first water channel groove from the tip in first template along rather than corresponding first water channel groove, be equipped with round first sealing washer groove along the peripheral interval in first water channel groove on the first template, first sealing washer inslot buries the sealing washer, two the water route is imported and export all is connected with a water route joint, be equipped with on the second template with first water channel groove matched with second water channel groove.

Further preferably, the cross section of first sealing washer groove is rectangular structure, and its two turning in bottom and opening all adopt fillet structure and fillet radius to be 0.1-0.3mm, can prevent that extruded sealing washer from being cut by two turning in bottom and opening two turning in first sealing washer groove, and then the seal failure that local infiltration caused after the waterway structure that leads to water.

Further preferably, the cross section of sealing washer is fillet rectangle structure, the width dimension of sealing washer is the same with the width dimension of first sealing washer groove, the height dimension of sealing washer is greater than the degree of depth dimension of first sealing washer groove and is 0.2mm, guarantees that first template and second template when locking the compound die, and the second template can be with the sealing washer higher than the part of first sealing washer groove and impress in two circular turning of opening in first sealing washer groove, guarantees the sealed effect of sealing washer.

Further preferably, a circle of second sealing ring grooves are formed in the second template along the periphery of the second water channel groove at intervals, and the second sealing ring grooves are matched with the first sealing ring grooves to realize positioning and fixing of the sealing rings.

Further preferably, the cross section of first sealing washer groove and second sealing washer groove all is rectangular structure, and rectangular structure's first sealing washer groove and second sealing washer groove can form the location and fix the sealing washer, prevent that the sealing washer from taking place to remove, two turning in the bottom of first sealing washer groove and two turning in the bottom of second sealing washer groove all adopt the fillet structure, can prevent that the sealing washer from receiving the extrusion and being cut.

Further preferably, the cross section of sealing washer is fillet rectangle structure, the width dimension of sealing washer is less than the width dimension of first sealing washer groove and the same, the height dimension of sealing washer is greater than the sum of the degree of depth dimensions of first sealing washer groove and second sealing washer groove, guarantees behind first template and second template compound die locking that the sealing washer can pack first sealing washer groove and second sealing washer groove, can play good sealed effect.

Further preferably, the sections of the first water channel groove and the second water channel groove are in semicircular structures, so that a circular water channel flow channel can be formed, the heat conduction is more uniform, and the products molded in the mold core can be uniformly heated; simultaneously, each processing semicircular groove on the first template and the second template is easier, and CNC rapid machining is facilitated.

Further preferably, a plurality of first positioning holes with rectangular structures are formed in the side face, close to the second template, of the first template, a plurality of second positioning holes with rectangular structures matched with the first positioning holes are formed in the second template, positioning blocks are fixed in the first positioning holes, and ends, far away from the first template, of the positioning blocks are arranged in the second positioning holes in a penetrating mode. The first locating hole, the second locating hole and the locating block of the rectangular structure are used for realizing the precise locating of the first template and the second template, so that the first template and the second template can be precisely matched with the first water channel groove and the second water channel groove after the die assembly is locked, the sealing ring is ensured to precisely seal the formed water channel, and sealing failure water leakage caused by errors is avoided.

Further preferably, a first through hole penetrating through the first template is formed in the middle of the bottom of the first positioning hole, a first fastening screw connected with the positioning block is arranged in the first through hole, and the positioning block is fixed through the first fastening screw; four corners of the first positioning hole are respectively provided with an avoidance groove, and the positioning block is conveniently inserted into the first positioning hole through the design of the avoidance grooves, so that the positioning block is convenient to install; one side of the positioning block is provided with a plurality of grooves which are used for storing lubricating oil, so that the positioning block is ensured to be connected smoothly in the installation and die operation processes, and the positioning block is convenient to be connected with other templates.

Further preferably, a plurality of connecting holes are formed in the first template, a plurality of second through holes matched with the connecting holes are formed in the second template, second fastening screws in threaded connection with the connecting holes are arranged in the second through holes in a penetrating mode, the second fastening screws are installed through the second through holes, the first template and the second template are clamped and locked through threaded connection of the connecting holes and the second fastening screws, a complete die core fixing plate is formed, and the tightness of a waterway runner is guaranteed; glue is smeared on the surfaces of the threads of the second fastening screws, so that the screws are fixed and water seepage is prevented after the second fastening screws are locked.

The beneficial effects are that: according to the special-shaped waterway structure for the injection mold, the waterway grooves are formed in the two templates, namely, the first waterway groove is formed in the first template, the second waterway groove is formed in the second template, the waterway channels are formed in the first template or the two templates, the sealing ring grooves are formed in the first template or the two templates, and then the sealing rings are embedded in the waterway channels to form the waterway structure, the waterway channels can be designed into different shapes according to the structure of the product, the path of the waterway channels is not limited, the uniform and stable heating of the product in the injection molding process is ensured, the uneven heating of the product is prevented from deforming, the production efficiency and the yield of the product are improved, and the injection molding requirements of products with different structures can be met; the waterway structure is simple in manufacturing process, low in manufacturing cost, good in waterway structure stability, good in waterway sealing effect and long in service life, can effectively solve the problem that the conventional waterway structure can only be provided with a linear waterway, and can solve the problems of high waterway cost and short service life due to 3D printing.

Drawings

Fig. 1 is a schematic diagram of an exploded structure of a special-shaped waterway structure for an injection mold according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of an axial side structure of a special-shaped waterway structure for an injection mold according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of a front view structure of a special-shaped waterway structure for an injection mold according to an embodiment of the present utility model;

FIG. 4 is a schematic structural diagram of a first template according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a second template according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional structural view of the waterway structure formed by the second die plate disclosed in FIG. 5 and the first die plate disclosed in FIG. 4;

FIG. 7 is an enlarged schematic view of the structure shown at A in FIG. 6;

FIG. 8 is a schematic diagram of another embodiment of a second template according to the present utility model;

FIG. 9 is a schematic cross-sectional structural view of the waterway structure formed by the second die plate disclosed in FIG. 8 and the first die plate disclosed in FIG. 4;

fig. 10 is an enlarged schematic view of the structure at B in fig. 9.

Reference numerals: 1-a first template, 11-a first water channel groove, 12-a water channel inlet and outlet, 13-a first sealing ring groove, 14-a first positioning hole, 15-an avoidance groove, 16-a first via hole, 17-a connecting hole, 2-a second template, the device comprises a first water channel groove, a first positioning hole, a first through hole, a first sealing ring groove, a first sealing ring, a second sealing ring, a first water channel joint, a second sealing ring, a first fastening screw and a second fastening screw.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1-10, the special-shaped waterway structure for the injection mold is applied to a mold core fixing plate of the injection mold, is used for adjusting the temperature of a product molded in the mold core, ensures the thermal stability of the product during injection molding, can adapt to the requirements of different product structures, is free from limitation of the path of the waterway runner 8, effectively prevents the product from deforming, and improves the product quality. The waterway structure comprises a die core fixing plate, wherein the die core fixing plate is formed by combining a first die plate 1 and a second die plate 2, a first waterway groove 11 of a special-shaped structure is formed in the side surface, close to the second die plate 2, of the first die plate 1, a second waterway groove 21 matched with the first waterway groove 11 is formed in the second die plate 2, the die core fixing plate is divided into two plates of the first die plate 1 and the second die plate 2, the setting of the special-shaped waterway structure is facilitated, a waterway channel 8 is formed by matching the first waterway groove 11 of the special-shaped structure and the second waterway groove 21, the waterway channel 8 is of the special-shaped structure, a cavity on a die core can be avoided, the uniformity and stability of heating of a product in the injection molding process are ensured, and the production efficiency and the yield are improved; and the waterway runner 8 with the special-shaped structure can be free from the limitation of the product structure, the defect that the waterway in the existing mold can only be of a linear structure is overcome, and the application range of the injection mold is improved. Two ends of the first water channel groove 11 are connected with a water channel inlet and outlet 12, each water channel inlet and outlet 12 penetrates into the first template 1 along the end part of the corresponding first water channel groove 11 and penetrates out of the adjacent side surface of the first template 1, which is provided with the side surface of the first water channel groove 11, a circle of first sealing ring grooves 13 are formed on the first template 1 along the periphery of the first water channel groove 11 at intervals, sealing rings 3 are embedded in the first sealing ring grooves 13, two water channel inlet and outlet 12 are connected with a water channel joint 4, and the arrangement of the water channel inlet and outlet 12 ensures that the first sealing ring grooves 13 can completely enclose the first water channel groove 11, so that the sealing rings can form loop sealing without breaking, and the sealing of the formed water channel 8 is ensured without water leakage; meanwhile, the waterway connector 4 is guaranteed not to be clamped between the first template 1 and the second template 2, the waterway connector 4 is guaranteed to be installed, the waterway connector 4 is prevented from being crushed, the first template 1 and the second template 2 can be unfolded after PT teeth of the waterway connector 4 are locked, and sealing failure water leakage is caused.

In the application, the section of the first sealing ring groove 13 is of a rectangular structure, the section of the sealing ring 3 is of a round-corner rectangular structure, the first sealing ring groove 13 of the rectangular structure can effectively limit and fix the sealing ring 3, the sealing ring 3 can be prevented from displacement in the die processing operation, the sealing effect is guaranteed, and the sealing effect is good; the two corners in the bottom and the two corners in the opening of the first sealing ring groove 13 all adopt fillet structures, through the setting of fillet structures, can avoid the die locking of the first template 1 and the second template 2 to die, form complete mould benevolence fixed plate promptly, extruded sealing washer 3 can be cut by the corner of the first template 1 and the second template 2, and then lead to the water route runner 8 to lead to local infiltration after the water, finally lead to sealing effect inefficacy of sealing washer 3. The radius of the fillets of the two corners at the bottom and the two corners of the opening of the first sealing ring groove 13 are 0.1-0.3mm, the width dimension of the sealing ring 3 is the same as the width dimension of the first sealing ring groove 13, the height dimension of the sealing ring 3 is 0.2mm larger than the depth dimension of the first sealing ring groove 13, namely, the height difference marked by H in fig. 7 is H=0.2 mm, after the die assembly and the locking of the first die plate 1 and the second die plate 2 are ensured, the part of the sealing ring 3 which is higher than the opening of the first sealing ring groove 13 can be pressed into the two corners of the opening of the first sealing ring groove 13, the sealing of the waterway runner 8 is realized, and the sealing ring 3 cannot be cut.

This waterway structure that provides in this application does not be equipped with the sealing washer groove on the second template 2, extrudees the sealing washer 3 in the first sealing washer groove 13 on the first template 1 through the second template 2, can realize the sealing to the waterway runner 8 that first waterway groove 11 and second waterway groove 21 constitute, forms waterway structure, is applicable to in the middle of the injection molding operation of conventional injection mold, and its applicable mould temperature is 80-160 ℃. This waterway structure can satisfy the heat stabilization demand of injection mold of different structure products, is heated or the cooling is abundant when guaranteeing that the product is moulded plastics, and the product is difficult for warping, and then can guarantee that the shaping cycle of product is short, and production efficiency is high, and the productivity is high, and product quality is good. The waterway structure is simple in manufacturing process and low in cost, and the injection molding process of the temperature-sensitive product can be ensured to be more stable.

The application also provides another waterway structure, namely, a circle of second sealing ring grooves 24 are formed on the second template 2 along the peripheral interval of the second waterway groove 21, and the rectangular structural grooves formed by the cooperation of the first sealing ring grooves 13 and the second sealing ring grooves 24 are more stable in fixing the sealing ring 3, can allow the greater deformation of the sealing ring 3 and ensure the fixing stability of the sealing ring 3. The sections of the first sealing ring groove 13 and the second sealing ring groove 24 are rectangular structures, so that the sealing ring 3 with the round-corner rectangular structure can be installed, the sealing effect is good, the extrusion resistance is strong, and the sealing pressure is high; the two corners at the bottom of the first sealing ring groove 13 and the two corners at the bottom of the second sealing ring groove 24 are both in round corner structures, so that the situation that water leakage occurs locally due to cutting of the sealing ring 3 during die assembly can be prevented. The width dimension of the sealing ring 3 is smaller than that of the first sealing ring groove 13, the height dimension of the sealing ring 3 is larger than the sum of the depth dimensions of the first sealing ring groove 13 and the second sealing ring groove 24, and the fact that the redundant height parts of the sealing ring 3 extruded when the first template 1 and the second template 2 are locked in a die clamping mode can be extruded in the redundant first sealing ring groove 13 and the redundant second sealing ring groove 24 is guaranteed. The waterway structure with the second waterway groove 21 arranged on the second template 2 can be suitable for injection molding operation at the mold temperature of 160-180 ℃ and can meet the sealing effect on the waterway channel 8.

In the application, the sections of the first water channel groove 11 and the second water channel groove 21 are in semicircular structures, the first water channel groove 11 and the second water channel groove 21 with semicircular structures can be combined into the water channel flow channel 8 with a circular structure, firstly, the heat conduction of the circular water channel flow channel 8 is more uniform, the products formed in the die core can be ensured to be heated uniformly, and the effect of heat stabilization is achieved; secondly, each processing semicircle groove on the first template 1 and the second template 2 is easier, which is convenient for CNC rapid processing.

In this application, be close to the first locating hole 14 of a plurality of rectangle structures on the side of second template 2 on the first template 1, be equipped with a plurality of second locating holes 22 of cooperation first locating hole 14 on the second template 2, first locating hole 14 internal fixation has locating piece 5, and the locating piece 5 is kept away from first template 1 end and wears to locate in the second locating hole 22. The cross section of locating piece 5 is rectangular structure, can realize the installation of locating piece 5 through rectangular structure's first locating hole 14 and second locating hole 22, and rectangular structure's locating piece 5 location is more accurate, guarantees that first water channel groove 11 on first template 1 and second water channel groove 21 on second template 2 can accurate adaptation after the compound die, forms water route runner 8, guarantees the sealing washer 3 simultaneously to water route runner 8's sealing, prevents to leak. The middle of the bottom of the first positioning hole 14 is provided with a first through hole 16 penetrating through the first template 1, a first fastening screw 6 connected with the positioning block 5 is arranged in the first through hole 16, the positioning block 5 is fixed through the first fastening screw 6, the first through hole 16 is a counter bore, the first fastening screw 6 is convenient to install, and the injection molding operation of a die core fixing plate formed by combining the first template 1 and the second template 2 is not hindered; four corners of the first positioning hole 14 are respectively provided with an avoidance groove 15, and the avoidance grooves 15 facilitate the installation of the positioning block 5, so that the positioning block 5 is easy to install; one side of the positioning block 5 is provided with a plurality of grooves, smeared lubricating oil can be stored, smooth connection between the positioning block 5 and the second template 2 and other templates is ensured, and an antirust effect is achieved.

In this application, be equipped with a plurality of connecting holes 17 on the first template 1, be equipped with a plurality of second via holes 23 of cooperation connecting hole 17 on the second template 2, wear to be equipped with in the second via hole 23 with connecting hole 17 threaded connection's second fastening screw 7. The connecting hole 17 is a threaded hole, the second through hole 23 is a counter bore, the second fastening screw 7 passes through the second through hole 23 and then is in threaded connection with the connecting hole 17, so that the die assembly locking of the first die plate 1 and the second die plate 2 is realized, the forming of a die core fixing plate is realized, the sealing rings 3 of the first die plate 1 and the second die plate 2 are ensured to be compressed to a required state, and finally, the effect of sealing a waterway is realized. The screw tooth surface of second fastening screw 7 is scribbled glue, and after first template 1 and second template 2 compound die lock was dead, can not dismantle again, through scribbling glue, optional 680 glue plays fixed second fastening screw 7 and prevents the purpose of infiltration, improves this waterway structure's life.

In this application, sealing washer 3 preferred use silica gel material makes, and sealing washer 3 through silica gel material makes is more high temperature resistant and, life is longer. The first template 1 and the second template 2 are made of S136 steel materials with good corrosion resistance and rust prevention effects, the polishing performance is better, the sealing effect of the waterway runner 8 after die locking is better, and the structure and the performance of the die core fixing plate formed by combining the first template 1 and the second template 2 are more stable.

In this application, minimum distance D between first water channel 11 and the first sealing washer groove 13 is 1-1.5mm, guarantees that the part between first water channel 11 and the first sealing washer groove 13 on the first template 1 has sufficient structural strength, guarantees that the sealing washer 3 can not be with the part extrusion fracture between first water channel 11 and the first sealing washer groove 13 behind compound die locking of first template 1 and second template 2, guarantees the sealed effect of sealing washer 3, and is shown in fig. 7 and 10.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the summary of the present utility model within the scope of the present utility model.

Claims

1. The utility model provides an injection mold is with dysmorphism waterway structure, includes mould benevolence fixed plate, mould benevolence fixed plate is formed by first template (1) and second template (2) combination, its characterized in that: the utility model discloses a water channel structure, including first template (1), second template (2), first template (1) and second template (11), first water channel groove (11) of dysmorphism structure has been seted up to the side of being close to, both ends in first water channel groove (11) all are connected with one water route and import and export (12), every water route import and export (12) all penetrate inside in first template (1) along the tip rather than corresponding first water channel groove (11) and wear out with the adjacent side of being equipped with the side in first water channel groove (11) on first template (1), first template (1) is gone up along the peripheral interval in first water channel groove (11) and is enclosed to be equipped with round first sealing washer groove (13), sealing washer (3) have been buried in first sealing washer groove (13), two water route import and export (12) all are connected with one water route joint (4), be equipped with on second template (2) with first water channel groove (11) matched with second water channel groove (21).

2. The profiled waterway structure for injection mold of claim 1, wherein: the cross section of the first sealing ring groove (13) is of a rectangular structure, both the bottom corners and the opening corners of the first sealing ring groove are of a round corner structure, and the round corner radius is 0.1-0.3mm.

3. The profiled waterway structure for an injection mold of claim 2, wherein: the cross section of sealing washer (3) is fillet rectangle structure, the width dimension of sealing washer (3) is the same with the width dimension of first sealing washer groove (13), the height dimension of sealing washer (3) is greater than the degree of depth size of first sealing washer groove (13) 0.2mm.

4. The profiled waterway structure for injection mold of claim 1, wherein: a circle of second sealing ring grooves (24) are formed in the second template (2) along the periphery of the second water path groove (21) at intervals, and the second sealing ring grooves (24) are matched with the first sealing ring grooves (13).

5. The profiled waterway structure for an injection mold of claim 4, wherein: the cross sections of the first sealing ring groove (13) and the second sealing ring groove (24) are rectangular structures, and two corners at the bottom of the first sealing ring groove (13) and two corners at the bottom of the second sealing ring groove (24) are round corner structures.

6. The profiled waterway structure for an injection mold of claim 5, wherein: the cross section of sealing washer (3) is fillet rectangle structure, the width size of sealing washer (3) is less than the width size of first sealing washer groove (13) and the same, the height dimension of sealing washer (3) is greater than the sum of the depth dimension of first sealing washer groove (13) and second sealing washer groove (24).

7. The profiled waterway structure for injection mold of claim 1, wherein: the sections of the first water channel groove (11) and the second water channel groove (21) are of semicircular structures.

8. The profiled waterway structure for injection mold of claim 1, wherein: the side that is close to second template (2) on first template (1) is equipped with a plurality of rectangular structure's first locating hole (14), be equipped with a plurality of rectangular structure's of cooperation first locating hole (14) second locating hole (22) on second template (2), first locating hole (14) internal fixation has locating piece (5), locating piece (5) are kept away from first template (1) end and are worn to locate in second locating hole (22).

9. The profiled waterway structure for an injection mold of claim 8, wherein: the novel positioning device is characterized in that a first through hole (16) penetrating through the first template (1) is formed in the middle of the bottom of the first positioning hole (14), a first fastening screw (6) connected with the positioning block (5) is arranged in the first through hole (16), avoidance grooves (15) are formed in four corners of the first positioning hole (14), and a plurality of grooves are formed in one side face of the positioning block (5).

10. The profiled waterway structure for injection mold of claim 1, wherein: be equipped with a plurality of connecting holes (17) on first template (1), be equipped with a plurality of second via holes (23) of cooperation connecting hole (17) on second template (2), wear to be equipped with in second via hole (23) with connecting hole (17) threaded connection's second fastening screw (7), the thread surface of second fastening screw (7) is scribbled glue.