CN110480946B

CN110480946B - Injection mold

Info

Publication number: CN110480946B
Application number: CN201910778013.4A
Authority: CN
Inventors: 章庆华
Original assignee: Isen Precision Industrial Shenzhen Co ltd
Current assignee: Isen Precision Industrial Shenzhen Co ltd
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2022-02-11
Anticipated expiration: 2039-08-22
Also published as: CN110480946A

Abstract

The invention provides an injection mold which comprises a lower mold plate, square iron, a lower mold core, a rear mold core, an ejection assembly, a pushing assembly and an elastic piece, wherein a plate cavity is formed at the upper end of the rear mold core, cavity holes are formed in the middle of the rear mold core, the pushing assembly comprises an inner push pipe needle and a push pipe, the elastic piece comprises a cylinder, a guide head arranged at one end of the cylinder and a plurality of positioning ribs arranged on the side edge of the other end of the cylinder, and the guide head is matched with the tail end of the inner push pipe needle. Above-mentioned injection mold adds man-hour, the guide head card that will play the type spare is gone into and is pushed away intraductal needle end, and make the location muscle support and lean on the inner wall in pushing away the pipe, make the cylinder be located pushing away a tub central point and put, the compound die and pour into the plastic into, make the plastic form the square slab in the board type intracavity, at the downthehole pushing away of die cavity and form thick circle glue column, wherein, plastic parcel bullet type spare forms thick circle glue column, make the inside heat dissipation that need not of thick circle glue column, it is not enough to have solved product strength, the problem of product appearance deformation.

Description

Injection mold

Technical Field

The invention relates to the technical field of injection molding processing, in particular to an injection mold.

Background

Among the injection moulding product, there is a structure class product, and it includes square slab and thick circle glue post, and the basic wall thickness of square slab is T, and during processing, the product requirement is that positive outward appearance is good, can not have basic defect, and wherein, the diameter size of thick circle glue post is the multifold of T, and thick circle glue post locates the root position that square slab outward appearance face is connected, and thick cylinder is solid.

The difficulty in processing the product with the structure is that the rubber material at the root of the thick round rubber column is too thick, and after the molten rubber is filled in a die cavity, the heat is concentrated and is not easy to cool; after the thick round rubber column is ejected after the mold is opened, a region with too thick rubber material needs to be cooled for a long time, the thick round rubber column has serious shrinkage pit defects in appearance after cooling, and meanwhile, the square plate and the thick round rubber column have large deformation due to large cooling shrinkage of a rubber position. The prior art solves the problems that: 1) the middle part of the tail end of the thick round rubber column is subjected to rubber drawing treatment, so that the defect of shrinkage pits in appearance can be overcome; after hollowing out, the weak position at the tail end of the thick round rubber column is lengthened a lot, the thick round rubber column is easy to deform by jacking during ejection, and meanwhile, the strength is weakened and cannot meet the functional requirements of products; 2) designing an air-assisted die structure at the solid position of the thick round rubber column, and blowing nitrogen gas into the thick round rubber column by using an air nozzle to blow the inside of the thick round rubber column into a hollow part; but the mold has a complex structure, special nitrogen generation equipment is needed for production, the cost is high, and after blowing, the strength of the solid position of the product is not good, so that the functional requirements of the product cannot be met; 3) the front surface of the square plate of the product is hollowed towards the thick round rubber column, but the appearance surface of the product is not allowed to be damaged, the strength of the solid position is also poor, and the functional requirement of the product cannot be met.

Disclosure of Invention

The invention aims to provide an injection mold, which aims to solve the problems of insufficient product strength and product appearance deformation caused by the fact that thick round rubber columns are too thick and are not easy to cool when products consisting of square plates and thick round rubber columns are produced by the existing injection mold.

The invention provides an injection mold, which comprises a lower template, square iron arranged at the upper end of the lower template, a lower mold core arranged at the upper end of the square iron, a rear mold core arranged at the upper end of the lower mold core, an ejection assembly arranged in the middle of the square iron, a pushing assembly connected with the lower template, and an elastic member arranged at the tail end of the pushing assembly, wherein at least one plate cavity is formed at the upper end of the rear mold core, the rear mold core is provided with a cavity hole in the middle of each plate cavity, the pushing assembly comprises a push tube inner needle and a push tube, one end of the push tube inner needle is connected with the lower template, the other end of the push tube inner needle sequentially penetrates through the ejection assembly and the lower mold core and extends into the cavity hole, the push tube is sleeved outside the push tube inner needle, one end of the push tube is connected with the ejection assembly, and the other end of the push tube extends into the plate cavity, the elastic piece comprises a cylinder, a guide head arranged at one end of the cylinder and a plurality of positioning ribs arranged at the side edge of the other end of the cylinder, and the guide head is matched with the tail end of the push tube inner needle.

Above-mentioned injection mold, add man-hour, the direction head card that will play the type spare is gone into and is pushed away intraductal needle end, and make the location muscle support and lean on the inner wall in pushing away the pipe, make the cylinder be located pushing away a tub central point and put, the compound die and pour into the plastic into, make the plastic form the square slab in the board type intracavity, form the thick circle glue column in the downthehole pushing away of die cavity, wherein, plastic parcel bullet type spare forms thick circle glue column, make the inside heat dissipation that need not of thick circle glue column, it is not enough to have solved product strength, the problem of product appearance deformation, can also reach following several beneficial effects simultaneously: 1) the mold has simple structure and simple injection production, and can well control the cost; 2) ensuring that the appearance of the product has no shrinkage pit defect; 3) ensuring that the product does not deform greatly due to large shrinkage; 4) ensuring that the product weak position is not damaged by jacking; 4) ensuring the strength of the solid position of the product.

Furthermore, the ejection assembly comprises an ejector pin panel, an ejector pin bottom plate and a plurality of ejector pins connected with the ejector pin bottom plate, and the tail end of each ejector pin extends to the lower end of the plate cavity.

Further, a plurality of the positioning ribs are arranged on the side edge of the column body at intervals in a circumferential array.

Further, the push tube inner needle is connected with the lower template through a connecting assembly, the connecting assembly comprises a pressing block and a screw arranged on one side of the pressing block, and the screw is in threaded connection with the lower template.

Furthermore, one end of the guide head is connected with the column, and the width of the free tail end of the guide head is gradually reduced.

Further, the maximum outer diameter of the guide head is smaller than the outer diameter of the column.

Furthermore, a glue inlet channel is formed between two adjacent plate cavities of the rear mold core, and two ends of the glue inlet channel are respectively communicated with one plate cavity.

Further, the cross section of the glue inlet channel is in a wave shape.

Furthermore, a plurality of elastic piece cavities are formed in the upper end of the rear mold core and communicated with the glue inlet channel.

Furthermore, a containing groove is formed in the position, corresponding to the guide head, of the push tube inner needle, and the shape of the containing groove is matched with that of the guide head.

Drawings

FIG. 1 is a top view of an injection mold in a first embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along the line A-A of the injection mold of FIG. 1;

FIG. 3 is a perspective view of the spring member of FIG. 2;

FIG. 4 is a schematic structural view of the injection molded article of FIG. 1 after injection molding;

FIG. 5 is a schematic view of a partially exploded structure of the injection mold of FIG. 1;

FIG. 6 is a top view of the injection mold mounting structure of FIG. 5;

FIG. 7 is a cross-sectional view taken in the direction B-B of the injection mold of FIG. 6;

fig. 8 is a plan view of an injection mold in a second embodiment of the present invention.

Description of the main element symbols:

lower template	10	Thimble bottom plate	51	Column body	71
						Square iron	20	Thimble panel	52	Guide head	72
Lower die core	30	Thimble	53	Positioning rib	73
						Rear mold core	40	Pushing assembly	60	Connecting assembly	80
Plate cavity	41	Push tube inner needle	61	Pressing block	81
						Cavity hole	42	Containing groove	611	Screw with a thread	82
Glue inlet channel	43	Push tube	62	Square plate	100
						Elastic piece die cavity	44	Bullet type piece	70	Rough round rubber column	101
Ejection assembly	50

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "left", "right" and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 7, the present invention provides an injection mold for processing a product composed of a square plate 100 and a thick round rubber column 101, wherein the injection mold comprises a lower mold plate 10, a square iron 20 disposed at an upper end of the lower mold plate 10, a lower mold core 30 disposed at an upper end of the square iron 20, a rear mold core 40 disposed at an upper end of the lower mold core 30, an ejection assembly 50 disposed in a middle of the square iron 20, a pushing assembly 60 connected to the lower mold plate 10, and an elastic member 70 disposed at a terminal of the pushing assembly 60, wherein the elastic member 70 is a bullet-shaped plastic product.

Specifically, in the embodiment of the present invention, two plate cavities 41 are formed at the upper end of the rear mold core 40, the rear mold core 40 is provided with a cavity hole 42 at the middle part of each plate cavity 41, the pushing assembly 60 comprises a push tube inner needle 61 and a push tube 62, one end of the push tube inner needle 61 is connected with the lower template 10, the other end of the push tube inner needle 61 sequentially penetrates through the ejection assembly 50 and the lower die core 30 and extends into the cavity hole 42, the push tube 62 is sleeved outside the push tube inner needle 61, and one end of the push pipe 62 is connected with the ejection assembly 50, and the other end extends into the plate cavities 41, specifically, a group of push assemblies 60 is arranged at the lower end of each plate cavity 41, the elastic piece 70 comprises a cylinder 71 and a guide head 72 arranged at one end of the cylinder 71, and a plurality of positioning ribs 73 arranged on the side edge of the other end of the column body 71, wherein the guide head 72 is matched with the tail end of the push tube inner needle 61. It is understood that in other embodiments of the present invention, the number of the plate-type cavities 41 may be provided on the rear mold core 40 according to the size of the rear mold core 40 and the square plate 100, and the number of the plate-type cavities 41 is at least one.

Above-mentioned injection mold, add man-hour, the guide head 72 card that will play type spare 70 is gone into and is pushed away intraductal needle 61 end, and make location muscle 73 support by in the inner wall that pushes away pipe 62, make cylinder 71 be located and push away pipe 62 central point and put, the compound die injects the plastic, make the plastic form square slab 100 in board type chamber 41, form thick round glue post 101 in the push away pipe 62 in die cavity hole 42, wherein, plastic parcel play type spare 70 forms thick round glue post 101, make inside the need not the heat dissipation of thick round glue post 101, can reach several beneficial effects: 1) the mold only needs to be provided with two cavities, the mold is simple in structure and simple in injection molding production, and cost and expense can be well controlled; 2) the middle part of the thick round rubber column 101 does not need to be radiated, so that the appearance of the product is ensured to have no shrinkage pit defect; 3) the middle part of the thick round rubber column 101 does not need heat dissipation, so that the product is prevented from being deformed greatly due to large shrinkage; 4) due to the elastic piece 70, the product weak position is ensured not to be damaged by jacking; 4) due to the elastic piece 70, the strength of the solid position of the product is ensured.

Specifically, in this embodiment, the ejection assembly 50 includes a thimble panel 52, a thimble base plate 51 and a plurality of thimbles 53 connected to the thimble base plate 51, and a distal end of each thimble 53 extends to a lower end of the plate cavity 41, so as to realize an ejection function.

Specifically, in this embodiment, the positioning ribs 73 are arranged at the side edge of the cylinder 71 at intervals in a circumferential array to ensure that the cylinder 71 is located at the center of the push tube 62, so that the plastic is uniformly distributed around the elastic member 70 to form the thick circular rubber column 101, thereby ensuring that the product appearance has no shrinkage pit defect.

Specifically, in this embodiment, the push tube inner pin 61 is connected to the lower template 10 through a connection assembly 80, the connection assembly 80 includes a pressing block 81 and a screw 82 disposed on one side of the pressing block 81, and the screw 82 is in threaded connection with the lower template 10, so as to connect the push tube inner pin 61 to the lower template 10.

Specifically, a containing groove 611 is formed in the position, corresponding to the guide head 72, of the push tube inner needle 61, the shape of the containing groove 611 is matched with the shape of the guide head 72, one end of the guide head 72 is connected with the column 71, the width of the free end of the guide head 72 is gradually reduced, and the maximum outer diameter of the guide head 72 is smaller than the outer diameter of the column 71, so that the guide head 72 is matched with the push tube inner needle 61, and the containing groove 611 is conveniently formed.

Specifically, in this embodiment, a glue inlet channel 43 is formed between two adjacent plate cavities 41 of the rear mold core 40, and two ends of the glue inlet channel 43 are respectively communicated with one plate cavity 41, so as to inject the glue into the plate cavity 41.

Specifically, in this embodiment, the cross section of the glue inlet channel 43 is in a wave shape, so as to prevent the plastic from directly impacting the surface of the product, and ensure that the product has no water marks on the appearance.

Referring to fig. 8, the injection mold according to the second embodiment of the present invention is different from the first embodiment in that two elastic piece cavities 44 are further formed at the upper end of the rear mold core 40 in the second embodiment, the elastic piece cavities 44 are communicated with the glue inlet channel 43, and when processing, by reasonably arranging the positions of the elastic piece cavities 44 of the elastic pieces 70, a set of mold can be used to form the elastic pieces 70, the square plates 100 and the thick round glue columns 101, and a final product is formed, so that the mold cost is reduced.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An injection mold comprises a lower template, square iron arranged at the upper end of the lower template, a lower mold core arranged at the upper end of the square iron, a rear mold core arranged at the upper end of the lower mold core, an ejection assembly arranged in the middle of the square iron, and a pushing assembly connected with the lower template, and is characterized by further comprising an elastic part arranged at the tail end of the pushing assembly, wherein at least one plate cavity is formed at the upper end of the rear mold core, a cavity hole is formed in the middle of each plate cavity of the rear mold core, the pushing assembly comprises a push tube inner needle and a push tube, one end of the push tube inner needle is connected with the lower template, the other end of the push tube inner needle sequentially penetrates through the ejection assembly and the lower mold core and extends into the cavity hole, the push tube is sleeved outside the push tube inner needle, one end of the push tube is connected with the ejection assembly, and the other end of the push tube extends into the plate cavity, the elastic piece comprises a cylinder, a guide head arranged at one end of the cylinder and a plurality of positioning ribs arranged at the side edge of the other end of the cylinder, the guide head is matched with the tail end of a push tube inner needle, a containing groove is arranged at the position, corresponding to the guide head, of the push tube inner needle, the shape of the containing groove is matched with that of the guide head, one end of the guide head is connected with the cylinder, the width of the free tail end of the guide head is gradually reduced, the maximum outer diameter of the guide head is smaller than that of the cylinder, and the positioning ribs are distributed at intervals in a circumferential array mode at the side edge of the cylinder.

2. The injection mold of claim 1, wherein the ejection assembly comprises a thimble panel, a thimble base plate, and a plurality of thimbles coupled to the thimble base plate, a distal end of each of the thimbles extending to a lower end of the plate cavity.

3. The injection mold of claim 1, wherein the push tube inner needle is connected with the lower template through a connecting assembly, the connecting assembly comprises a pressing block and a screw arranged on one side of the pressing block, and the screw is in threaded connection with the lower template.

4. The injection mold of claim 1, wherein the rear mold core is located between two adjacent plate cavities to form a glue inlet channel, and two ends of the glue inlet channel are respectively communicated with one plate cavity.

5. An injection mold according to claim 4, wherein the cross-section of the glue inlet channel is wave-shaped.

6. The injection mold of claim 4, wherein a plurality of spring type piece cavities are further formed in the upper end of the rear mold core and are communicated with the glue inlet channel.