CN113500741A

CN113500741A - Injection mould

Info

Publication number: CN113500741A
Application number: CN202110779643.0A
Authority: CN
Inventors: 罗运辉; 卢艳玲; 陈生凤
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2021-10-15

Abstract

The invention discloses an injection mold which comprises a first mold base and a second mold base which are mutually buckled, wherein a first mold cavity is arranged on the first mold base, a second mold cavity is arranged on the second mold base, a movable mold core is arranged in the first mold cavity, a fixed mold insert is fixedly connected with the movable mold core, the fixed mold insert is arranged in the second mold cavity, the first mold cavity and the second mold cavity are communicated to form a mold closing mold cavity, and an exhaust structure is arranged in the mold closing mold cavity. According to the injection mold provided by the invention, the conductive adhesive punch is arranged at the position where the conductive adhesive is adhered to the injection part, so that the problem of conductive adhesive fracture caused by incomplete flash cleaning is thoroughly solved. The matching surfaces of the injection molding fixed mold insert and the movable mold core are changed into plane matching from original taper matching, the mold parting surface is eliminated, the abrasion of the contact surface can be reduced, the flash of the contact position is smaller, the foreign matter is less, and the performance is better.

Description

Injection mould

Technical Field

The invention belongs to the technical field of injection molds, and particularly relates to an injection mold.

Background

The dc motor is a rotating electrical machine that can convert dc electrical energy into mechanical energy or vice versa. The structure of the direct current motor is composed of a stator and a rotor. The motor stator iron core is formed by stacking and pressing a plurality of silicon steel sheets, so that the thickness of the iron core formed by pressing is deviated, the outer insulating layer part of the stator is obtained by injection molding through an injection mold, and the machining thickness deviation of the iron core can cause plastic leakage in the injection molding process, so that the product generates flash.

The flash is the flash of the plastic package material on the product, and two cavities of the mold have a gap during mold closing, so that an extra contour edge is formed during injection molding. The conductive adhesive is required to be pasted on the outline edge, and the position for pasting the conductive adhesive needs to pass through the outline edge, so that the conductive adhesive is easy to damage, and the problem of flash and foreign matters in the machine is caused.

One of the flash factors generated by injection molding of the stator of the direct current motor is caused by abrasion of a die parting surface, so that an injection mold needs to be designed urgently to eliminate flash on an injection molding joint line.

Disclosure of Invention

In order to solve the problem of conductive adhesive fracture caused by flash generated by injection molding and die assembly of the stator in the background art, the invention provides an injection mold to solve the problem of conductive adhesive fracture.

In order to achieve the purpose, the specific technical scheme of the injection mold is as follows:

the utility model provides an injection mold, is provided with first die cavity including the first die holder and the second die holder of mutual lock on the first die holder, is provided with the second die cavity on the second die holder, sets up movable mold core in the first die cavity, and movable mold core fixedly connected with cover half mold insert, cover half mold insert set up in the second die cavity, and first die cavity and second die cavity are linked together and are formed the compound die cavity, are provided with exhaust structure in the compound die cavity.

Furthermore, a plurality of first die cavities are arranged on the first die holder, a plurality of second die cavities are correspondingly arranged on the second die holder, and the first die cavities and the second die cavities are accommodating holes.

Further, the exhaust structure comprises a conductive adhesive punch head, and the conductive adhesive punch head extends outwards along the opening of the first cavity; the conductive adhesive punch further comprises a groove matched with the conductive adhesive punch, and the groove is formed in the side wall of the opening of the second cavity.

Further, the conducting resin punch comprises a body, wherein an insertion end is arranged at the bottom end of the body and inserted into the groove, so that the conducting resin punch is matched with the groove.

Further, the end of the conductive adhesive punch is provided with a mounting block, and the mounting block is fixedly connected with a fixing groove in the first cavity, so that the conductive adhesive punch is fixedly connected with the first cavity.

Further, an iron core is sleeved on the outer wall of the movable mold core, and an end cover is arranged at the end part of the movable mold core.

Furthermore, a matching hole is formed in the fixed mold insert, and the movable mold core is clamped with the fixed mold insert through the matching hole.

Furthermore, a transition surface is arranged at the joint of the end surface of the fixed mold insert and the side wall of the movable mold core.

Furthermore, the transition surface is an arc surface, one end of the arc surface is connected with the inner wall of the matching hole, and the other end of the arc surface is connected with the outer wall of the movable mold core.

Furthermore, a guide pillar is arranged on the first die holder, a guide sleeve is arranged on the second die holder, and the guide pillar and the guide sleeve are correspondingly arranged, so that the first die holder and the second die holder are buckled with each other, and the guide pillar is inserted into the guide sleeve to be clamped and matched with each other.

The injection mold of the invention has the following advantages: according to the injection mold provided by the invention, the conductive adhesive punch is arranged at the position where the conductive adhesive is adhered to the injection part, so that the problem of conductive adhesive fracture caused by incomplete flash cleaning is thoroughly solved. The matching surfaces of the injection molding fixed mold insert and the movable mold core are changed into plane matching from original taper matching, the mold parting surface is eliminated, the abrasion of the contact surface can be reduced, the flash of the contact position is smaller, the foreign matter is less, and the performance is better.

Drawings

FIG. 1 is a schematic structural view of an injection mold of the present invention;

FIG. 2 is a schematic structural view of a lower die holder of the stator die of the present invention;

FIG. 3 is a schematic structural view of a fixed mold insert and a movable mold core in cooperation with each other in the prior art;

FIG. 4 is a cross-sectional view taken in the direction F-F of FIG. 3;

FIG. 5 is a schematic view of the mating configuration of the stationary mold insert and the movable mold core of the present invention;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5;

fig. 7 is a schematic structural view of the conductive paste punch according to the present invention.

The notation in the figure is:

1. a first die holder; 11. a guide post; 12. a first cavity; 13. a conductive adhesive punch; 131. a body; 132. an insertion end; 133. mounting blocks; 14. positioning blocks; 2. a second die holder; 21. a guide sleeve; 22. a second cavity; 23. a groove; 24. positioning a groove; 3. a fixed die insert; 4. moving the mold core; 41. a transition surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The injection mold of the present invention will be described below with reference to fig. 1 to 7.

The injection mold is mainly used for injection production of the stator of the direct current motor, and in the actual production process, cavities on two sides of the mold can generate gaps in the mold closing process, so that flash is formed on the shell of the motor stator after injection. The flash formed by injection molding of the stator shell usually needs to be pasted with conductive adhesive, but due to the existence of the flash, the conductive adhesive is damaged, and the like.

As shown in fig. 1, the injection mold provided by the invention comprises a first mold base 1, wherein a plurality of first cavities 12 are arranged on the first mold base 1, the plurality of first cavities 12 are uniformly distributed, and specifically, the plurality of first cavities 12 are arranged at equal intervals, so that a plurality of injection parts can be produced by one-time injection molding.

Further, the first die holder 1 is buckled with a second die holder 2, a plurality of second cavities 22 are formed in the second die holder 2, the second cavities 22 are arranged corresponding to the first cavities 12, and the first cavities 12 are buckled with the second cavities 22 to form a matched die cavity. And (5) injection molding in the mold closing cavity to produce the stator of the direct current motor.

As shown in fig. 2, an exhaust structure is arranged in the die assembly cavity, the exhaust structure enables the injection die to increase an exhaust function, a part after injection molding is full and has no air bubbles, flash on the shell of the part is reduced, meanwhile, the exhaust structure is arranged on the position of the shell, which is used for pasting conductive adhesive, so that the injection molding part is provided with an installation groove, the installation groove is used for pasting the conductive adhesive, and the problem of conductive adhesive fracture caused by incomplete flash cleaning is thoroughly avoided.

Further, the exhaust structure includes conductive adhesive punch 13, and conductive adhesive punch 13 sets up on the lateral wall of the opening part of first die cavity 12, and conductive adhesive punch 13 extends the setting to second die cavity 22 direction by first die cavity 12 opening, and conductive adhesive punch 13 protrusion first die holder 1's bottom surface sets up. The exhaust structure further comprises a groove 23, the groove 23 is formed in the side wall of the opening of the second cavity 22, and the groove body of the groove 23 is provided with an opening of the second cavity 22 and extends towards the bottom end of the second cavity 22. When the first cavity 12 is buckled with the second cavity 22, the first cavity 12 and the second cavity 22 form a die assembly cavity, and the conductive adhesive punch 13 and the groove 23 are matched to form an exhaust structure.

As shown in fig. 7, the conductive adhesive punch 13 includes a body 131, an insertion end 132 is disposed on the body 131, a gap is disposed between the surface of the insertion end 132 and the surface of the body 131, the insertion end 132 is inserted into the groove 23, the outer dimension of the insertion end 132 is matched with the dimension of the conductive adhesive, so that the conductive adhesive punch 13 is matched with the groove 23, and the conductive adhesive punch 13 is clamped with the groove 23. Specifically, the shape of the groove 23 is matched with the shape of the conductive adhesive insertion end 132, so that the conductive adhesive groove 23 is inserted into the groove 23 and completely matched, and the exhaust structure is formed.

Further, a mounting block 133 is disposed on a side wall of the end portion of the body 131, and the mounting block 133 corresponds to a fixing groove disposed in the first cavity 12, so that the mounting block 133 is fixedly disposed in the fixing groove, and the conductive paste punch 13 is fixedly disposed in the first cavity 12. When the first cavity 12 and the second cavity 22 are buckled, the conductive adhesive punch 13 is inserted into the groove 23 and is tightly matched with the groove to form an exhaust structure.

Specifically, exhaust structure's position setting is in the position that the part pasted the conducting resin of moulding plastics, simultaneously, pastes phenomenons such as askew when can placing the conducting resin sticky subsides on the part shell, and the position of pasting of quick accurate location conducting resin. The exhaust structure can also prevent the flash caused by the abrasion of the parting surface from cutting off the conductive adhesive tape. The concave-convex mould design of the exhaust structure enables the groove 23 at the position where the conductive adhesive is adhered to form an exhaust groove for exhausting when the mould is closed, so that the exhaust function is achieved.

Preferably, the first cavity 12 and the second cavity 22 are provided as receiving holes, which are circular holes, mainly for adapting to the housing shape of the injection molded part stator. Of course, the shape of the accommodating hole is not specifically limited herein, and the accommodating hole may be configured as an accommodating hole of other shapes, which mainly meets the requirements of users.

Further, be provided with guide pillar 11 on the terminal surface of first die holder 1, set up guide pin bushing 21 on the second die holder 2, guide pillar 11 and guide pin bushing 21 correspond the setting to when making first die holder 1 lock on second die holder 2, more accurate with first die cavity 12 of first die holder 1 and the second die cavity 22 on the second die holder 2 accurate. Specifically, the guide pillar 11 is a columnar structure, the guide sleeve 21 is a cylindrical hole, and when the first cavity 12 of the first die holder 1 is aligned with the second cavity 22 of the second die holder 2, the guide pillar 11 of the first die holder 1 is only required to be inserted into the guide sleeve 21 of the second die holder 2, so that the first die holder 1 and the second die holder 2 can be accurately matched. The guide pillar 11 and the guide sleeve 21 are matched to ensure the mold closing precision of the first mold base 1 and the second mold base 2 of the injection mold, and the guide effect of the guide pillar 11 and the guide sleeve 21 is used for quickly aligning the first cavity 12 and the second cavity 22.

Furthermore, a positioning block 14 is arranged on the side wall of the first die holder 1, a positioning groove 24 is arranged on the side wall of the second die holder 2, and the positioning block 14 and the positioning groove 24 are matched to ensure the concentricity of the products of the first die holder 1 and the second die holder 2 during die assembly.

Specifically, the positioning block 14 protrudes out of the side wall of the first die holder 1, the positioning block 14 has a side wall of the first die holder 1 extending outward, the positioning block 14 is a block-shaped structure, and the specific shape of the positioning block 14 is not particularly limited herein. The positioning groove 24 is formed in the side wall of the second die holder 2, and the shape of the positioning groove 24 is matched with that of the positioning block 14, so that when the first die holder 1 is buckled on the second die holder 2, the positioning block 14 is inserted into the positioning groove 24, and the concentricity of products during die assembly is guaranteed. Specifically, every lateral wall sets up locating piece 14 on first die holder 1, and is the same, every lateral wall corresponds and sets up constant head tank 24 on second die holder 2, and at this moment, when first die holder 1 lock was on second die holder 2, guide pillar 11 and guide pin bushing 21 played the guide effect, and locating piece 14 and constant head tank 24 guarantee the concentricity of product when the compound die.

Further, second die cavity 22 internal fixation sets up cover half mold insert 3, the cooperation of cover half mold insert 3 has movable mold core 4, cover half mold insert 3 and movable mold core 4 set up in closing the model intracavity, cover half mold insert 3 and movable mold core 4 contact and form the contact surface, the contact surface makes the mould produce the die joint, the die joint leads to moulding plastics back product to form corner structure, because the corner structure of product formation easily produces the overlap, lead to the direct current motor foreign matter to produce easily, and movable mold core 4 leads to the corner defect for the corner structure collides with cover half mold insert 3 easily at the in-process of taking, appear running when if defective then can lead to moulding plastics and lead to the product to mould plastics badly.

As shown in fig. 3 and 4, which are schematic structural diagrams of the matching of the fixed mold insert 3 and the movable mold core 4 in the prior art, the contact surfaces of the fixed mold insert 3 and the movable mold core 4 are vertically arranged, and form corners for vertical surface products, so that the contact surface abrasion is increased, the number of flashes at the contact position is large, and the performance is poor.

Fig. 5 and 6 are schematic structural diagrams illustrating the cooperation between the fixed mold insert 3 and the movable mold core 4 provided by the invention. The fixed mold insert 3 is fixedly connected with the second cavity 22 through screws, and the fixed mold insert 3 is of an annular structure. The through-hole fit of cover half mold insert 3 has movable mould core 4, and the contact surface of movable mould core 4 and cover half mold insert 3 is provided with transition surface 41, and the one end of transition surface 41 is connected with the pore wall of cover half mold insert 3, and the other end of transition surface 41 and the outer wall connection of movable mould core 4 to make the outer wall of cover half mold insert 3 and movable mould core 4 pass through transition surface 41 and connect, thereby eliminate the die joint structure, consequently, the overlap structure can not appear in the shell of the back part of moulding plastics.

Preferably, the transition surface 41 is an arc surface, so that the contact surface of the movable mold core 4 and the fixed mold insert 3 is a plane, the mold parting surface structure is eliminated, and the problem of flash trouble of the product is avoided.

Further, the outer wall of movable mold core 4 is sleeved with an iron core, the inner diameter of the iron core is larger than the outer diameter of movable mold core 4, and in the specific use process, movable mold core 4 needs to be put into the oil press integrally, and movable mold core 4 and the iron core after finishing shaping are in a tightly assembled and inseparable state. And placing the assembled movable mold core 4 and the iron core in a through hole in the fixed mold insert 3, and then buckling the end cover on the movable mold core 4, wherein the fixed mold insert 3 and the movable mold core 4 in the mold closing cavity are assembled.

Further, with first die holder 1 and the lock of second die holder 2, guide pillar 11 and guide pin bushing 21 cooperate and lead to, the concentricity of product is guaranteed in locating piece 14 inserts constant head tank 24, and meanwhile, conducting resin drift 13 inserts its structure of formation exhaust in the recess 23, and in specific use, second die holder 2 is fixed motionless, uses and makes the first mould that starts, and when first mould pushed down, the product carries out the state of moulding plastics.

According to the injection mold provided by the invention, the conductive adhesive punch 13 is arranged at the position where the conductive adhesive is adhered to the injection part, so that the problem of conductive adhesive fracture caused by incomplete flash cleaning is thoroughly solved. Specifically, a conductive adhesive punch 13 is added at the contact position of the conductive adhesive of the product, the second die holder 2 is made into a corresponding groove 23, and an exhaust groove is formed in the groove 23 for exhausting air during die assembly, so that the problem that the conductive adhesive is cut, broken and sold after being formed at the position of the conductive adhesive due to flash can be solved; eliminating the parting surface of the die, namely, the flash caused by abrasion and cutting the conductive adhesive tape; the matching surfaces of the injection molding fixed mold insert 3 and the movable mold core 4 are changed from the original taper fit into the plane fit, so that the abrasion of the contact surface can be reduced, the flash at the contact position is smaller, the foreign matters are less, and the performance is better.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides an injection mold, its characterized in that, includes first die holder and the second die holder of mutual lock, is provided with first die cavity on the first die holder, is provided with the second die cavity on the second die holder, sets up movable mold core in the first die cavity, and movable mold core fixedly connected with cover half mold insert, cover half mold insert set up in the second die cavity, and first die cavity and second die cavity are linked together and are formed the compound die cavity, are provided with exhaust structure in the compound die cavity.

2. The injection mold of claim 1, wherein the first mold base has a plurality of first cavities and the second mold base has a plurality of second cavities, the first and second cavities being receiving holes.

3. The injection mold of claim 1, wherein the venting structure comprises a conductive adhesive punch extending outwardly along the opening of the first cavity; the conductive adhesive punch further comprises a groove matched with the conductive adhesive punch, and the groove is formed in the side wall of the opening of the second cavity.

4. An injection mould according to claim 3, characterized in that the conductive adhesive punch comprises a body, the bottom end of the body is provided with an insertion end, and the insertion end is inserted into the groove, so that the conductive adhesive punch and the groove are in inserted fit.

5. The injection mold of claim 3, wherein the conductive paste punch is provided at an end thereof with a mounting block, and the mounting block is fixedly coupled to the fixing groove in the first cavity, thereby fixedly coupling the conductive paste punch to the first cavity.

6. The injection mold of claim 1, wherein an iron core is sleeved on the outer wall of the movable mold core, and an end cover is arranged at the end part of the movable mold core.

7. The injection mold of claim 1, wherein the fixed mold insert has a mating hole formed therein, and the movable mold core is clamped to the fixed mold insert through the mating hole.

8. The injection mold of claim 7, wherein a transition surface is provided at a junction of the end surface of the fixed mold insert and the side wall of the movable mold core.

9. An injection mould according to claim 8, characterized in that the transition surface is a circular arc surface, one end of which is connected with the inner wall of the mating hole and the other end of which is connected with the outer wall of the movable mould core.

10. The injection mold of claim 1, wherein the first mold base has a guide post thereon, and the second mold base has a guide sleeve thereon, the guide post and the guide sleeve being disposed in correspondence such that the first mold base and the second mold base are engaged with each other, and the guide post is inserted into the guide sleeve and engaged therewith.