CN217944081U

CN217944081U - Injection molding device for thread insert in appearance surface of injection molding piece

Info

Publication number: CN217944081U
Application number: CN202221722898.XU
Authority: CN
Inventors: 丁国强; 王银土
Original assignee: Shanghai Aerospace Fenghua Technology Co ltd
Current assignee: Shanghai Aerospace Fenghua Technology Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-12-02
Anticipated expiration: 2032-07-06

Abstract

The utility model relates to the technical field of injection molding, in particular to an injection molding device for a thread insert in an injection molding piece appearance surface, which comprises an injection mold component, wherein the injection mold component comprises an insert mold for shaping the injection molding piece insert surface and an overflow preventing rod, and the overflow preventing rod comprises a positioning column and a bolt connection column for a bolt connection internal thread insert; the insert die comprises a positioning hole, and the positioning column is in transition fit with the positioning hole; the insert die is further provided with a magnetic suction component for magnetically sucking the overflow blocking rod, so that the outer surface of the internal thread insert is attached to the inner wall of the insert die. The utility model discloses can avoid the problem of the downthehole flash of internal thread inserts and surface rubber coating, moreover, internal thread inserts surface energy and the plastics outward appearance face parallel and level of place after injection moulding.

Description

Injection molding device for thread insert in appearance surface of injection molding part

Technical Field

The utility model relates to a technical field that moulds plastics especially relates to a device of moulding plastics of screw insert in injection molding outward appearance face.

Background

For use, some plastic products require a flush fit of the internally threaded insert in the face. The mode that prior art inlays the internal thread inserts on the outward appearance face of injection molding does: fixing a smooth cylinder at the position of the insert corresponding to the injection mold, sleeving the internal thread insert on the cylinder, attaching the end face of the internal thread insert to the mold, and then performing mold closing and injection molding.

The product percent of pass of the mode is lower, wherein two factors influencing the product percent of pass are the overflow in the insert hole and the surface encapsulation of the insert.

The cylinder is inserted in the internal thread hole of the insert, a gap exists between the cylinder and the internal thread hole, and the injection molding material easily flows into the gap to cause the overflow of the insert hole, so that the qualified rate is reduced.

The vibration in the mold closing process easily enables the insert to be separated from the surface of the mold, so that the injection molding material easily flows into a gap between the insert and the mold, and the surface of the insert is adhered with plastic, namely the surface of the insert is coated with rubber.

Chinese utility model patent that application number is CN202021023499.5 discloses a fastener for automobile injection molding inserts, comprises a workbench, workstation sliding connection has two clamp splices, and two clamp splices are connected with the handle respectively, and the bottom of handle is connected with the buckle, and the workstation still contains the draw-in groove, and this scheme is through the cooperation between parts such as clamp splice, buckle, draw-in groove to fix the inserts. The scheme is beneficial to solving the problem of surface encapsulation of the insert, but the insert of the injection molding part produced by the scheme is difficult to be flush with the appearance surface of the plastic; moreover, when the internal thread insert is fixed by the scheme for injection molding, the problem of flash in the insert hole is difficult to solve.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art exist not enough, provided an injection molding appearance internal thread inserts's device of moulding plastics, be favorable to making internal thread inserts surface and place plastics surface parallel and level to avoid the problem of the downthehole flash of internal thread inserts and surface rubber coating.

The utility model discloses a can realize through following technical scheme:

an injection molding device for a threaded insert in an appearance surface of an injection molding piece comprises an injection mold assembly, wherein the injection mold assembly comprises an insert mold for shaping the surface of the injection molding piece insert and an overflow preventing rod, and the overflow preventing rod comprises a positioning column and a screw connection column for screw connection of the threaded insert; the insert die comprises a positioning hole, and the positioning column is in transition fit with the positioning hole; the insert die is further provided with a magnetic suction component for magnetically sucking the overflow blocking rod, so that the outer surface of the internal thread insert is attached to the inner wall of the insert die.

The outer surface of the internal thread insert is a surface which is flush with the appearance surface of the plastic after injection molding.

The utility model discloses contain and hinder excessive stick, hinder excessive stick and contain the spiro union post that is used for spiro union internal thread inserts, from this, can avoid the material of moulding plastics material to internal thread inserts's internal thread department, and then avoid the downthehole flash of internal thread inserts.

The overflow preventing rod further comprises a positioning column, the insert die comprises a positioning hole, the positioning column is in transition fit with the positioning hole, the insert die is further provided with a magnetic suction assembly for magnetically sucking the overflow preventing rod so that the outer surface of the internal thread insert can be attached to the inner wall of the insert die, therefore, the outer surface of the internal thread insert is favorably prevented from being separated from the inner wall of the insert die in the injection molding processes of die assembly and the like, the injection molding material is prevented from flowing into the gap between the insert and the insert die to cause the situation of surface encapsulation of the insert, and the surface of the internal thread insert after injection molding is flush with the appearance surface of the plastic.

Preferably, the outer diameter of the outer surface of the internal thread insert is larger than the aperture of the positioning hole.

Therefore, the magnetic suction device is favorable for preventing the overflow blocking rod from driving the internal thread insert to enter the positioning hole under the magnetic suction effect, and further the outer surface of the internal thread insert cannot be attached to the inner wall of the insert die.

Preferably, one end of the threaded connection column is connected to an end face of the positioning column, and the internal thread insert which is screwed in place abuts against the positioning column.

If the internal thread insert is not screwed in place, the internal thread has the problem that the material overflows in the hole of the internal thread insert due to partial non-screwing, and if the internal thread insert is excessively screwed, the wall thickness of the plastic at the excessive screwing position is influenced. Should preferably the one end of spiro union post connect in the middle in the terminal surface of reference column, the spiro union is in place the internal thread inserts butt in the reference column, thereby, the operating personnel of being convenient for will be the internal thread inserts spiro union in place fast.

Preferably, the length of the positioning column is smaller than the depth of the positioning hole.

In the actual batch production process, a plurality of overflow resisting rods are needed, the length of the positioning column of each overflow resisting rod is inevitably error, and the length of the positioning column is preferably smaller than the depth of the positioning hole, so that when a certain positioning column is slightly longer due to production errors, the positioning column can still be completely inserted into the positioning hole, and the situation that the internal thread insert abutted against the positioning column cannot be attached to the insert die due to the fact that the positioning column cannot be completely inserted into the positioning hole is avoided.

Preferably, the insert mold comprises Rong Ciqiang, the magnetic attraction component comprises a magnet and a shell for placing the magnet, and the shell is screwed with the magnetic accommodating cavity.

Therefore, the magnet can be quickly and stably fixed on the insert die through the shell, or can be detached from the insert die for maintenance.

Preferably, the shell comprises an outer shell and an inner shell which are detachably mounted, a clamping piece is connected to the inner bottom surface of the outer shell, and the magnet comprises a through hole for clearance fit with the clamping piece; the screens piece contains and winds a plurality of card posts of the axis annular array of through hole, the inner shell spiro union has the awl stick, the awl stick rotates to inserting the screens piece is in order to strut each card post, and the card post interference fit that struts is in the through hole.

Since vibration should be avoided as much as possible during the injection molding process, it is necessary to stably fix the magnet. This magnetism subassembly of inhaling can regard as the general accessory and the batch production of injection molding outward appearance face inserts mould, and the part of batch production inevitably has dimensional tolerance. Preferably, the clamping piece is in clearance fit with the through hole of the magnet, the clamping piece comprises a plurality of clamping columns in an annular array around the axis of the through hole, the inner shell is in threaded connection with a conical rod, the conical rod rotates to be inserted into the clamping piece to support each clamping column, and the supported clamping columns are in interference fit with the through hole. Therefore, the device can be used for expanding the clamping column through the conical rod, and is in interference fit with the through hole through the expanded clamping column, so that the problem that the clamping piece cannot stably fix the magnet due to the influence of the tolerance of the aperture of the through hole can be avoided.

Preferably, the inner shell is screwed to the outer shell.

Therefore, an operator can enable the inner shell and the outer shell to abut against two sides of the through hole of the magnet respectively by tightly rotating the inner shell, and the magnet is further stably fixed.

Preferably, the through hole is coaxial with the overflow-preventing rod, and the magnet is axially magnetized.

Therefore, when the shell rotates in the magnetic containing cavity to drive the magnet to rotate, the position relation between the magnetic field of the magnet and the overflow-resistant rod is relatively stable, and the stable magnetic attraction of the magnet is facilitated.

Preferably, the surface of the magnet is provided with a magnetic coating layer.

The magnetism extending coating layer can comprise a copper layer and a heat insulation layer, so that the magnetic loss of the magnet can be reduced, and the service life of the magnet can be prolonged.

The utility model discloses following beneficial effect has:

1. the utility model discloses can avoid the condition of the downthehole flash of internal thread inserts and surface rubber coating, internal thread inserts surface and the plastics outward appearance face parallel and level of place after injection moulding moreover.

2. Internal thread inserts spiro union target in place the back butt in the reference column, the operating personnel of being convenient for target in place internal thread inserts spiro union fast.

3. The insert die comprises Rong Ciqiang, and the shell with the magnet is screwed in the magnetic cavity. Therefore, the magnet can be quickly and stably fixed on the insert die through the shell, or can be detached from the insert die for maintenance.

4. The utility model discloses can strut the card post through the awl stick, through the card post interference fit who struts in the through hole, so, can avoid the problem of screens piece because of the unable stable fixed magnet of tolerance influence in the aperture of through hole.

5. Inner shell spiro union in the shell, the operator can make inner shell and shell butt respectively in the both sides of the through hole of magnet through changeing tight inner shell, is favorable to further stable fixed magnet.

6. The through hole is coaxial with the overflow-preventing rod, and the magnet is axially magnetized. Therefore, when the shell rotates in the magnetic containing cavity to drive the magnet to rotate, the position relation between the magnetic field of the magnet and the overflow-resistant rod is relatively stable, and the stable magnetic attraction of the magnet is facilitated.

7. The surface of magnet is equipped with and prolongs magnetism cladding layer, is favorable to slowing down the magnetic loss of magnet, prolongs the life of magnet.

Drawings

FIG. 1 is a schematic sectional view of the injection molding apparatus of the present invention;

FIG. 2 is an enlarged view of a portion of area A of FIG. 1;

FIG. 3 is a partial enlarged view of the area B in FIG. 2 when the cone is not distracting the jamming column;

fig. 4 is a partially enlarged view of the area B in fig. 2 when the cone expands the jamming column.

In the figure: the magnetic insert comprises a 1 internal thread insert, a 2 insert die, a 21 positioning hole, a 22 magnetic accommodating cavity, a 3 overflow preventing rod, a 31 positioning column, a 32 screw connecting column, a 4 magnetic suction component, a 41 magnet, a 411 through hole, a 42 conical rod, a 43 shell, a 431 outer shell, a 432 inner shell, a 44 clamping piece and a 441 clamping column.

Detailed Description

The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.

An injection molding apparatus for a threaded insert in the outer surface of an injection molded part, as shown in fig. 1 and 2, comprises an injection mold assembly including an insert mold 2 for shaping the insert surface of the injection molded part, and an overflow preventing rod 3. The overflow-preventing rod 3 comprises a positioning column 31 and a screw connection column 32 for screw connection of the internal thread insert 1, the inner wall of the insert die 2 is provided with a positioning hole 21, and the positioning column 31 is in transition fit with the positioning hole 21. The external diameter of the outer surface of the internal thread insert 1 is larger than the aperture of the positioning hole 21, the insert die 2 is further provided with a magnetic component 4, the magnetic component 4 is magnetically attracted to the overflow blocking rod 3, so that the outer surface of the internal thread insert 1, namely the surface flush with the plastic appearance surface after injection molding, is attached to the inner wall of the insert die 2.

Further, preferably, one end of the screw post 32 is connected to an end surface of the positioning post 31, and the female insert 1 screwed in place abuts against the positioning post 31. If the female thread insert 1 is not screwed in place, the female thread has a problem of hole flash due to partial non-screwing, and if the screw is excessively screwed, the wall thickness of the plastic at the excessively screwed part is affected. This preference facilitates the quick screwing of the internally threaded insert 1 into place by the operator. The screwing in place means that the internal thread of the internally threaded insert 1 is just completely screwed to the screw post 32.

The positioning post 31 needs to be completely inserted into the positioning hole 21 so that the outer surface of the internal thread insert 1 can be attached to the inner wall of the insert die 2. In an actual mass production process, a plurality of overflow blocking rods 3 are required, the length of the positioning column 31 of each overflow blocking rod 3 is inevitably wrong, and preferably, the length of the positioning column 31 is smaller than the depth of the positioning hole 21, so that when a certain positioning column 31 is slightly longer due to a production error, the positioning column can still be completely inserted into the positioning hole 21.

The insert die 2 comprises a magnetic containing cavity 22, the magnetic suction component 4 comprises a magnet 41 and a shell 43 used for placing the magnet 41, and the shell 43 is screwed with the magnetic containing cavity 22.

Since vibration should be avoided as much as possible during the injection molding process, the magnet 41 should be stably fixed. This magnetism subassembly 4 is inhaled can regard as the general accessory and the batch production of injection molding outward appearance face insert mould, and the part of batch production inevitably has dimensional tolerance.

In order to stably fix the magnet 41, it is preferable that the housing 43 comprises an outer shell 431 and an inner shell 432 which are detachably installed, as shown in fig. 3 and 4, a detent 44 is connected to an inner bottom surface of the outer shell 431, and the magnet 41 comprises a through hole 411 for clearance-fitting with the detent 44; the locking member 44 includes a plurality of locking posts 441 annularly arrayed around the axis of the through hole 411, the inner shell 432 is screwed with a conical rod 42, the conical rod 42 rotates to be inserted into the locking member 44 to prop open each locking post 441, and the propped locking posts 441 are in interference fit with the through hole 411.

Therefore, the device can expand the clamping column 441 through the conical rod 42, and then the expanded clamping column 441 is in interference fit with the through hole 411, so that the problem that the clamping piece 44 cannot stably fix the magnet 41 due to tolerance influence of the aperture of the through hole 411 can be avoided.

Further, the inner case 432 is screwed to the outer case 431, and an operator may make the inner case 432 and the outer case 431 respectively abut against both sides of the penetrating hole 411 of the magnet 41 by screwing the inner case 432 tightly, so as to more stably fix the magnet 41.

The magnet 41 rotates with the housing 43 in the magnet accommodating cavity 22, and in order to enable the magnet 41 to stably attract and block the overflow rod 3, preferably, the through hole 411 is coaxial with the overflow rod 3, and the magnet 41 is axially magnetized, so that even if the magnet 41 rotates with the housing 43, the position relationship between the magnetic field of the magnet 41 and the overflow rod 3 is relatively stable, which is beneficial for the magnet 41 to stably attract and block the overflow rod 3.

Preferably, the surface of the magnet 41 is provided with a magnetic coating layer, and the magnetic coating layer may include a copper layer and a thermal insulation layer to slow down the loss of the magnetic force of the magnet 41 and prolong the service life of the magnet 41.

The embodiments of the invention described above and shown in the drawings are intended as examples only and do not limit the invention. Those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the present disclosure, and such modifications or substitutions are intended to be included within the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. An injection molding device of a threaded insert in an appearance surface of an injection molding part comprises an injection mold component, wherein the injection mold component comprises an insert mold (2) for shaping the surface of the injection molding part insert, and is characterized by further comprising an overflow preventing rod (3), wherein the overflow preventing rod (3) comprises a positioning column (31) and a screwing column (32) for screwing the threaded insert (1); the insert die (2) comprises a positioning hole (21), and the positioning column (31) is in transition fit with the positioning hole (21); the insert die (2) is also provided with a magnetic suction component (4) for magnetically sucking the overflow blocking rod (3), so that the outer surface of the internal thread insert (1) is attached to the inner wall of the insert die (2).

2. An injection molding apparatus for a threaded insert in the external surface of an injection molded part according to claim 1, characterized in that the external diameter of the external surface of the internally threaded insert (1) is larger than the diameter of the positioning hole (21).

3. An injection molding apparatus for a threaded insert in the external surface of an injection molded part according to claim 1, characterized in that one end of the screw post (32) is connected to the end face of the positioning post (31), and the threaded insert (1) screwed in place abuts against the positioning post (31).

4. An injection molding apparatus for a threaded insert in the design surface of an injection molded part according to claim 3, characterized in that the length of the positioning post (31) is smaller than the depth of the positioning hole (21).

5. An injection molding apparatus for injection molding of threaded inserts in injection molded part facade according to claim 1, characterized in that the insert mold (2) contains Rong Ciqiang (22), the magnetically attractive assembly (4) contains a magnet (41) and a housing (43) for placing the magnet (41), the housing (43) is screwed to the Rong Ciqiang (22).

6. An injection molding apparatus for an in-plane threaded insert of an injection molded part appearance according to claim 5, wherein the housing (43) comprises an outer shell (431) and an inner shell (432) which are detachably mounted, a detent (44) is connected to an inner bottom surface of the outer shell (431), and the magnet (41) comprises a through hole (411) for clearance fit with the detent (44); the clamping piece (44) comprises a plurality of clamping columns (441) which are annularly arrayed around the axis of the through hole (411), a conical rod (42) is screwed in the inner shell (432), the conical rod (42) rotates to be inserted into the clamping piece (44) to support each clamping column (441), and the supported clamping columns (441) are in interference fit with the through hole (411).

7. An injection molding apparatus for a threaded insert in the external surface of an injection molded part according to claim 6, characterized in that the inner housing (432) is threaded to the outer housing (431).

8. An injection molding apparatus for a threaded insert in the external surface of an injection molded part according to claim 7, characterized in that the through hole (411) is coaxial with the spill-resistant rod (3) and the magnet (41) is axially magnetized.

9. An injection molding apparatus for a threaded insert in the design face of an injection molded part according to claim 6, characterized in that the surface of the magnet (41) is provided with a magnetically extending coating.