Injection mold for injection molding processing of metal insert

Abstract

The utility model discloses an injection mold for metal insert injection processing, which comprises a front mold core, a rear mold core, a metal insert, an insert fixing component and a positioning and locking mechanism, the front mold core and the rear mold core are detachably connected through the positioning and locking mechanism, the metal insert is placed on the rear mold core, and the insert fixing component is fixed on the front mold core. An insert fixing assembly is arranged on the top surface of the front mold core, a product ejector pin penetrating through the front mold core is arranged in the insert fixing assembly, the product ejector pin is arranged perpendicular to the mold closing surface, and the product ejector pin abuts against the upper end of the metal insert and limits the metal insert; a filling nozzle is arranged on the front mold core, a sprue runner leading to the metal insert is arranged on a mold closing surface of the front mold core and the rear mold core, the filling nozzle is communicated with the sprue runner, molten plastic liquid is injected from the filling nozzle, the molten plastic liquid flows to the bottom end of the metal insert through the sprue runner, and the lower end of the metal insert is subjected to embedding injection molding processing; the mold is high in mold changing speed, short in contact time with an injection molding machine table, high in injection molding efficiency and capable of greatly improving the productivity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold technical field, concretely relates to a kind of injection mold for metal insert injection processing. BACKGROUND

[0002] Metal insert injection is a kind of embedded model, metal insert is fixed in mold in proper position in advance, then injection molding is formed, after mold opening, embedded part is tightly buried in product by cooled solidified plastic, and product with embedded part such as threaded ring, electrode etc. is obtained.The die pin for the injection molding of metal insert needs to be split in workbench during injection processing, after metal insert is placed in die pin, die pin is assembled, so that metal insert can be positioned and fixed in die pin, so that the accuracy of injection molding product can be ensured during injection molding.Manual split and assembly of die pin occupy long time of injection workbench, which can lead to long injection cycle and low injection efficiency, and the mode can only be operated on vertical injection machine, and cannot be operated on horizontal injection machine, not only the selection of machine is limited, but also it is highly dependent on manual operation, and capacity is low.In addition, there are difficulties in manual on-site placement of metal insert, metal insert is fixed by upper die pin and lower die pin, if placement position is error, metal insert is easily pressed during die pin clamping, which can cause large burr of subsequent injection product, processing difficulty of post-processing, and affect product appearance, if metal insert is shaken or floated in die pin, it is easy to be offset during injection molding, which can cause the consequence of defective product.Therefore, existing embedded part processing injection die pin needs to be improved. SUMMARY

[0003] In view of the above problems and technical requirements, the utility model provides an injection mold for metal insert injection processing, the injection mold can accurately position metal insert, has the advantages of fast mold changing speed, short contact time with injection machine, flexible selection of injection machine, high capacity and high yield.

[0004] The utility model discloses a technical scheme as follows: an injection mold for metal insert injection molding processing, comprising a front mold core, a rear mold core, a metal insert, an insert fixing assembly and a positioning and locking mechanism, the front mold core and the rear mold core are detachably connected through the positioning and locking mechanism, the metal insert is placed on the rear mold core, the top surface of the front mold core is provided with the insert fixing assembly, a product ejector pin that penetrates through the front mold core is arranged in the insert fixing assembly, the product ejector pin is perpendicular to the mold closing surface, the product ejector pin is tightly arranged on the upper end of the metal insert to limit the metal insert; a pouring nozzle is arranged on the front mold core, a sprue runner that leads to the metal insert is arranged on the mold closing surface of the front mold core and the rear mold core, the pouring nozzle is in communication with the sprue runner, molten plastic liquid is injected from the pouring nozzle, the molten plastic liquid flows to the bottom end of the metal insert through the sprue runner to perform embedding injection molding processing on the lower end of the metal insert. In the scheme, the positioning and locking mechanism can lock the front mold core and the rear mold core after the front mold core and the rear mold core are closed, so that the metal insert on the mold closing surface is fixed by the insert fixing assembly, the locked mold core can be directly placed in the mold frame of an injection molding machine for injection molding operation, and the mold closing operation of the mold core on the machine table is not needed, the fixing effect of the metal insert is good, and the locked mold core can be flexibly selected on the machine table, and good injection molding effect can be achieved whether the machine is a vertical machine or a horizontal machine.

[0005] Further, the insert fixing assembly further comprises sprue inserts and an insert pressing plate, two tightly abutting and spliced sprue inserts are vertically embedded in the front mold core, an injection molding flow channel is arranged between the spliced surfaces of the sprue inserts, the bottom of the metal insert is an injection molding cavity, the injection molding flow channel is thick at one end and thin at the other end, the thick end is in communication with the sprue runner, and the thin end is in communication with the injection molding cavity, and the injection molding flow channel guides the molten plastic liquid into the injection molding cavity. The sprue inserts are in communication with the sprue runner and the injection molding cavity, and can accurately extrude the molten plastic into the injection molding cavity to prevent overflow.

[0006] Further, the insert pressing plate is installed on the top surface of the front mold core through bolts, the middle part of the insert pressing plate is pressed on the two sprue inserts to limit the sprue inserts, the front end of the insert pressing plate is connected with the product ejector pin, and the product ejector pin is connected to the bottom surface of the insert pressing plate through a screw. After the injection molding processing is completed, the product ejector pin can eject the locked mold core as a whole from the mold frame.

[0007] Further, the positioning and locking mechanism comprises locking screws and positioning pins, two positioning screw holes are arranged on the front mold core, the two positioning screw holes are arranged at a group of opposite corners of the front mold core, two locking screws are connected with the corresponding positioning screw holes by penetrating through the rear mold core from the bottom, and the head of each locking screw is provided with an operating knob.

[0008] Further, the other group of diagonal of the front mold core is respectively provided with a pin hole, when the front mold core and the rear mold core are closed, two positioning pins are correspondingly inserted into the two pin holes, and the pin hole is further provided with a positioning plug corresponding to the positioning pin.

[0009] Further, the four sides of the rear mold core are inclined surfaces, and the bottom surface of the rear mold core is matched with the end portions of the plurality of mold core thimbles. The inclined surface of the rear mold core can be matched with the injection mold frame, and the rear mold core can be positioned by the inclined surface when being placed, so that the rear mold core can be placed at will and automatically positioned. When being ejected, only a segment needs to be ejected, and the whole mold core can be separated from the mold frame, so that the mold core is conveniently taken out.

[0010] Further, the four corners of the closed surface of the rear mold core and the front mold core are concave-convex engagement matched.

[0011] Further, the front mold core is provided with two handles.

[0012] The beneficial effects of the utility model are as follows: 1) the metal insert is placed in the rear mold core in advance, the front mold core and the rear mold core are closed and locked, the mold core and the metal insert in the interior are locked to form a whole, the mold core after being locked does not separate in the transportation process, and the metal insert in the interior also keeps in the stable injection position, so that when the injection processing operation is carried out, the mold core only needs to be placed in the mold frame, and then the safety door can be closed, the injection machine can automatically close and inject, the occupation time of the machine is short, the processing efficiency is greatly improved, the time of contacting the machine by the labor is reduced, the accidental risk is reduced, and the safety is improved; 2) the mold core changing speed is fast, the inclined surface outside the rear mold core can be matched with the mold frame when being placed in the injection machine, the inclined surface is used for positioning, the rear mold core can be placed at will and automatically positioned, when being ejected, the mold core thimble only needs to be ejected by a small segment, and the whole mold core can be separated from the mold frame, so that the mold core is conveniently taken out, the taking and placing efficiency is high, and the mold core changing speed is greatly improved; 3) the metal insert in the mold core is tightly pressed on the metal insert by the positioning and locking mechanism and the insert fixing assembly, the metal insert after being closed and locked does not move, the injection precision is improved, and the shaking of the thimble mold core is avoided; 4) the mold core in the locked state after being closed can be produced by not only the vertical injection machine, but also the horizontal injection machine, the production mode is flexible and various, the production efficiency can be accelerated, and the production capacity is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an overall structural view of the injection mold for the metal insert injection processing of the utility model;

[0014] Figure 2 It is a closing view of the front mold core and the rear mold core in the utility model;

[0015] Figure 3The utility model discloses a front mould core structure diagram of the utility model;

[0016] Figure 4 The utility model discloses a metal insert fixed structure diagram on the rear mould core of the utility model;

[0017] Figure 5 The utility model discloses a gate insert internal structure diagram;

[0018] Marked in the drawing: front mould core 1, pouring spout 11, positioning screw hole 12, pin hole 13, positioning plug 131, handle 14, rear mould core 2, gate runner 21, injection mould cavity 22, inclined plane 23, metal insert 3, insert fixed assembly 4, insert pressing plate 41, bolt 411, gate insert 42, injection runner 421, product ejector pin 43, positioning locking mechanism 5, locking screw 51, operating knob 511, positioning pin 52, mould core ejector pin 6. DETAILED DESCRIPTION

[0019] The application will be further described below in conjunction with the drawings and examples.

[0020] As Figures 1-5 The utility model discloses a kind of injection mould for metal insert injection molding, including front mould core 1, rear mould core 2, metal insert 3, insert fixed assembly 4 and positioning locking mechanism 5, front mould core 1 and rear mould core 2 are detachably connected by positioning locking mechanism 5, metal insert 3 is placed on rear mould core 2, the top surface of front mould core 1 is equipped with insert fixed assembly 4, product ejector pin 43 is equipped in insert fixed assembly 4, product ejector pin 43 is perpendicular to the setting of mould face, product ejector pin 43 is tightly on the upper end of metal insert 3, and metal insert 3 is limited in position.

[0021] Pouring spout 11 is equipped on front mould core 1, and gate runner 21 leading to metal insert 3 is equipped on the mould face of front mould core 1 and rear mould core 2, pouring spout 11 is communicated with gate runner 21, melt plastic liquid is injected from pouring spout 11, melt plastic liquid flows to the bottom end of metal insert 3 by gate runner 21, and the lower end of metal insert 3 is carried out investment injection molding processing.Insert fixed assembly 4 also includes gate insert 42 and insert pressing plate 41, two close-fitting split gate inserts 42 are vertically embedded in front mould core 1, and injection runner 421 is equipped between the split surface of gate insert 42, the bottom of metal insert 3 is injection mould cavity 22, injection runner 421 is thick at one end and thin at the other end, thick end is communicated with gate runner 42, thin end is communicated with injection mould cavity 22, and injection runner 421 guides melt plastic liquid into injection mould cavity 22.

[0022] The insert pressing plate 41 is installed on the top surface of the front mold core 1 by bolts, the middle part of the insert pressing plate 41 is pressed on the two gate inserts 42, the gate inserts 42 are limited, the front end of the insert pressing plate 41 is connected with the product ejector pin 43, and the product ejector pin 43 is connected to the bottom surface of the insert pressing plate 41 by screws. The rear mold core 2 is in concave-convex engagement with the four corners of the mold closing surface of the front mold core 1. The front mold core 1 is provided with two handles 14.

[0023] The positioning and locking mechanism 5 comprises locking screws 51 and positioning pins 52, the front mold core 1 is provided with two positioning screw holes 12, the two positioning screw holes 12 are arranged at a group of opposite corners of the front mold core 1, the two locking screws 51 are connected with the corresponding positioning screw holes 12 by penetrating the bottom mold core 2, and the head of each locking screw 51 is provided with an operation knob 511. The other group of opposite corners of the front mold core 1 is respectively provided with a pin hole 13, when the front mold core 1 and the rear mold core 2 are closed, the two positioning pins 52 are correspondingly inserted into the two pin holes 13, and the pin hole 13 is further provided with a positioning plug 131 corresponding to the positioning pin 52. The positioning pin 52 and the pin hole 13 cooperate to pre-position the front mold core 1 and the rear mold core 2 during mold closing, so as to prevent the mold from being misaligned.

[0024] The four sides of the rear mold core 2 are inclined surfaces 23, and the bottom surface of the rear mold core 2 is matched with the end portions of a plurality of mold core ejector pins 6. The inclined surface 23 of the rear mold core 2 can be matched with the injection mold frame, and when being placed, the inclined surface 23 is used for positioning, so that the rear mold core 2 can be placed at will, automatic positioning is realized, and when being ejected, only a part needs to be ejected, so that the whole mold core can be separated from the mold frame, and the rear mold core 2 is convenient to take out.

[0025] In the utility model, the steps of placing the metal insert into the mold core and taking out the product are as follows:

[0026] 1. The metal insert 3 is first installed into the front mold core 1, and the product ejector pin 43 is used for limiting and limiting the height of the metal insert 3;

[0027] 2. The rear mold core 2 and the front mold core 1 are assembled by closing the mold, the positioning pin 52 is first inserted into the pin hole 13, and the positioning is preferentially performed, and finally the positioning is completed by the concave-convex engagement of the four corners;

[0028] 3. The locking screws 51 of the front mold core 1 and the rear mold core 2 are manually locked by operating the operation knob 511, the two locking screws 51 are respectively and tightly connected with the corresponding positioning screw holes 12, the mold core and the metal insert 3 in the mold core after being closed are regarded as a whole, are not separated during movement, and the metal insert 3 remains in a stable state;

[0029] 4. The handle 14 is grabbed, the mold core is placed into the mold frame of the injection molding machine, and the mold is closed and injection molded;

[0030] 5. The molten plastic enters the runner channel 21 through the nozzle, is uniformly extruded into the injection mold cavity 22 through the injection flow channel 421 in the nozzle insert 42, fills the injection mold cavity 22 with the molten plastic, embeds the bottom end of the metal insert 3, and ends the injection molding, and the mold core is ejected through the mold core ejector pin 6 in the injection molding machine;

[0031] 6. The mold core is taken out, placed on the workbench, the locking screw 51 is loosened, and the front mold core 1 and the rear mold core 2 are opened;

[0032] 7. The product ejector pin 43 is pressed with a screw, the metal insert injection molded product is taken out, the material head of the injection molded product is removed, and the finished injection molded workpiece containing the metal insert is obtained.

[0033] The above only describes several preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes and replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An injection mold for insert injection molding of a metal insert, characterized by: The front mold core and the rear mold core are detachably connected through the positioning locking mechanism, the metal insert is placed on the rear mold core, the top surface of the front mold core is provided with the insert fixing assembly, the insert fixing assembly is provided with the product ejector pin penetrating the front mold core, the product ejector pin is perpendicular to the mold closing surface, the product ejector pin is tightly pressed on the upper end of the metal insert to limit the metal insert, the front mold core is provided with a pouring nozzle, the mold closing surface of the front mold core and the rear mold core is provided with a gate runner leading to the metal insert, the pouring nozzle is in communication with the gate runner, the molten plastic liquid is injected from the pouring nozzle, and the molten plastic liquid flows to the lower end of the metal insert through the gate runner to perform embedding injection molding processing on the lower end of the metal insert.

2. An injection mold for insert injection molding of a metal insert according to claim 1, characterized in that: The insert fixing assembly further comprises gate inserts and an insert pressing plate, the two closely fitted gate inserts are vertically embedded in the front mold core, the fitted surfaces of the gate inserts are provided with an injection molding flow channel, the bottom of the metal insert is an injection molding cavity, the injection molding flow channel is thick at one end and thin at the other end, the thick end is in communication with the gate runner, and the thin end is in communication with the injection molding cavity, and the injection molding flow channel guides the molten plastic liquid into the injection molding cavity.

3. An injection mold for insert molding a metal insert as defined in claim 2, wherein: The insert pressing plate is installed on the top surface of the front mold core through bolts, the middle part of the insert pressing plate is pressed on the two gate inserts to limit the gate inserts, and the front end of the insert pressing plate is connected with the product ejector pin.

4. An injection mold for insert molding a metal insert as defined in claim 3, wherein: The positioning locking mechanism comprises locking screws and positioning pins, the front mold core is provided with two positioning screw holes, the two positioning screw holes are arranged at a group of opposite corners of the front mold core, two locking screws are connected with the corresponding positioning screw holes by penetrating the rear mold core from the bottom, and the head of each locking screw is provided with an operating knob.

5. An injection mold for insert molding a metal insert as defined in claim 4, wherein: The other group of opposite corners of the front mold core is respectively provided with a pin hole, when the front mold core and the rear mold core are closed, the two positioning pins are correspondingly inserted into the two pin holes, and the pin hole is further provided with a positioning plug corresponding to the positioning pin.

6. An injection mold for insert molding a metal insert as defined in claim 5, wherein: The four sides of the rear mold core are inclined surfaces, and the bottom surface of the rear mold core is matched with the end portions of the plurality of mold ejector pins.

7. An injection mold for insert molding a metal insert as defined in claim 6, wherein: The four corners of the mold closing surface of the rear mold core are concave-convex engagement matched.

8. An injection mold for insert molding a metal insert as defined in claim 7, wherein: The front mold core is provided with two handles.

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