CN216831959U

CN216831959U - Anti-sticking plastic stretching sample strip injection mold

Info

Publication number: CN216831959U
Application number: CN202122395060.6U
Authority: CN
Inventors: 苏琪; 张仪; 查晋
Original assignee: Aoshengde Functional Materials Suzhou Co ltd
Current assignee: Aoshengde Functional Materials Suzhou Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-06-28
Anticipated expiration: 2031-09-30

Abstract

The utility model discloses a tensile spline injection mold of plastics of antiseized mould, tensile spline injection mold of plastics of antiseized mould include: cover half and movable mould, the intermediate position of cover half sets up the injecting glue mouth, 2 tensile spline molding chambers of plastics and T type runner are seted up to the symmetry on the movable mould, the extreme point of T type runner is located under the cover half injecting glue mouth, the extreme point position of T type hot runner sets up ejecting chamber, ejecting chamber bottom is installed the drawing of patterns thimble, the upper portion in ejecting chamber sets up and is reversed to draw the structure. In this way, the utility model discloses can effectively solve the product and make a design the time sample strip and adhere the cover half, the production that arouses pauses and spline shaping quality is poor, test result distortion problem.

Description

Anti-sticking plastic stretching sample strip injection mold

Technical Field

The utility model relates to a plastic mold field especially relates to a tensile spline injection mold of plastics of antiseized mould.

Background

When the engineering plastic particles are subjected to tensile property detection, corresponding tensile sample strips are manufactured in an injection molding size forming mode according to national regulations, the nylon injection molding temperature is high, the sample strips are easily adhered to the fixed die due to the temperature difference between two surfaces of the sample strips after the sample strips are formed and are not easy to take down, the sample strips can only be knocked down by using a copper rod, so that the die is easily damaged, the injection molding process is discontinuous, the injection molding efficiency is reduced, the stay time of a sample in a gun barrel is too long, the sample degradation condition can be generated, and the test is inaccurate.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a tensile spline injection mold of plastics of anti-sticking mould can prevent that the shaping spline from adhering the cover half, improves sample shaping quality.

In order to solve the technical problem, the utility model discloses a technical scheme be: providing a mold-sticking-preventing plastic tensile sample strip injection mold, which comprises: cover half and movable mould, the intermediate position of cover half sets up the injecting glue mouth, 2 tensile spline molding chambers of plastics and T type runner are seted up to the symmetry on the movable mould, the extreme point of T type runner is located under the cover half injecting glue mouth, the extreme point position of T type hot runner sets up ejecting chamber, ejecting chamber bottom is installed the drawing of patterns thimble, the upper portion in ejecting chamber sets up and is reversed to draw the structure.

In a preferred embodiment of the present invention, the T-shaped flow channel includes a main flow channel and two branch flow channels separated from each other to both sides, and a buffer chamber is disposed at an intersection of the main flow channel and the branch flow channels. The interface of the sub-runner and the plastic stretching spline forming cavity is located in the middle of one end of the plastic stretching spline forming cavity, and the distance between the interface of the sub-runner and the plastic stretching spline forming cavity and the tail end of the sub-runner is not less than half of the width of the clamping end of the formed plastic stretching spline.

In a preferred embodiment of the present invention, the reverse-pulling structure disposed on the upper portion of the ejecting cavity is a semicircular reverse-pulling inclined plane, the lower portion of the ejecting cavity is a tapered bottom cavity, the bottom of the tapered bottom cavity is the top of the ejector pin, the top surface of the tapered bottom cavity is flush with the bottom surface of the flow channel, the semicircular reverse-pulling inclined plane surrounds the top surface of the tapered bottom cavity, and is located on the side of the flow channel where the melt flows in the opposite direction, and the included angle between the reverse-pulling inclined plane and the horizontal plane is smaller than the included angle between the wall of the tapered bottom cavity and the horizontal plane, and the reverse-pulling inclined plane is provided with a pull groove for recessing. The pull groove is semicircular, and the depth of the pull groove is 0.3-0.5 mm.

In a preferred embodiment of the present invention, the cavity wall of the conical bottom cavity is provided with a plurality of irregular concave surfaces.

The beneficial effects of the utility model are that: the utility model discloses carry out configuration optimization to the ejecting position of thimble on the basis of conventional tensile sample mould, increased and counter-drawn the structure, improve the effort between spline and the movable mould, can effectively solve the spline and block on the cover half from time to time, the problem that can't drop has improved continuity of moulding plastics and spline shaping quality, has solved because the production pauses the test result distortion problem that the spline quality decline that leads to.

Drawings

FIG. 1 is a schematic top view of a movable mold according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of the structure of the outlet of the thimble shown in the schematic top view;

the parts in the drawings are numbered as follows:

1. the device comprises a movable die, a forming cavity, a flow channel, a push-out cavity, a buffer cavity, a port 6, a thimble 7, a die cavity 3, a flow channel 4, a push-out cavity 5, a buffer cavity 6 and a push-out pin 7;

401. a conical bottom cavity, 402, a semicircular reverse pull inclined surface, 403, a pull groove and 404, a concave surface.

Detailed Description

The following description of the preferred embodiments of the present invention will be provided with reference to the accompanying drawings, so that the advantages and features of the present invention can be easily understood by those skilled in the art, and the scope of the present invention can be clearly and clearly defined.

Referring to fig. 1 and 2, an embodiment of the present invention includes:

a mold-sticking-preventing plastic tensile sample strip injection mold, comprising: cover half and movable mould 1, the intermediate position of cover half sets up the injecting glue mouth, 2 tensile spline molding cavities of plastics 2 and T type runner 3 are seted up to the symmetry on the movable mould 1, the extreme point of T type runner 3 is located under the cover half injecting glue mouth, the extreme point position of T type hot runner 3 sets up ejecting chamber 4, ejecting chamber 4 bottom sets up the export of drawing of patterns thimble 7, the upper portion of ejecting chamber 4 sets up the anti-structure of drawing.

The reverse-pulling structure arranged at the upper part of the ejection cavity 4 is a semicircular reverse-pulling inclined surface 402, and the lower part of the ejection cavity 4 is a conical bottom cavity 401. The bottom of the conical bottom cavity 401 is the top of the thimble 7, the top surface of the conical bottom cavity 401 is flush with the bottom surface of the flow channel 3, the semicircular counter-pulling inclined surface 402 is arranged around the top surface of the conical bottom cavity 401 and is positioned on the side opposite to the flow direction of the melt in the flow channel 3, the included angle between the semicircular counter-pulling inclined surface 402 and the horizontal plane is 45 degrees, the included angle between the cavity wall of the conical bottom cavity 401 and the horizontal plane is 60 degrees, and the semicircular counter-pulling inclined surface 402 is provided with an inwards-concave pull groove 403. The pull groove 403 is also semicircular and easy to remove, and the depth of the pull groove 403 is 0.3-0.5 mm. Through the pull groove 403, plastics that imbed in the pull groove 403 solidifies into and draws the piece when the mould unloading after the end of moulding plastics, can hold the shaping spline, prevents that the shaping spline from gluing on the cover half surface, can't take off along with the temperature decline, the pull groove 403 can not be too dark, otherwise can influence the ejecting of thimble 7.

A plurality of irregular concave surfaces 404 are arranged on the wall of the conical bottom cavity 401, the concave surfaces 404 are dents formed by using a harder metal rod, and the concave surfaces can further improve the friction force at the position of the ejection cavity 4 and increase the reverse pulling force.

T type runner 3 includes sprue and two subchannel to both sides partd, the sprue sets up cushion chamber 5 with subchannel's nodical position, cushion chamber 5 helps the distribution of the fuse-element in runner 3 in two molding cavity 2, prevents that both sides molding cavity 2 feeding is unbalanced, arouses the spline test error after the shaping.

The subchannel with interface 6 of the tensile spline molding chamber 2 of plastics is located the intermediate position of the tensile spline molding chamber 2 one end of plastics, just the distance of the tail end of subchannel is greater than half of the tensile spline exposed core width of plastics that is formed, and the spline fashioned plumpness when moulding plastics is in order to improve through this kind of setting, and the spline in the molding chamber 2 is not full when preventing to mould plastics.

The utility model discloses a theory of operation as follows:

during sample preparation, a melt firstly enters an ejection cavity 4 through a pouring gate arranged on a fixed die, and then naturally distributed into two molding cavities 2 for stretching sample strips through a flow channel 3 under extrusion pressure after the ejection cavity 4 is filled, in the process, the semi-circular pull grooves 403 on the inclined surface 402 are filled firstly, so that the solidification is fastest when the sample strips are solidified, and when the die is opened, the solidified pull blocks in the pull grooves 403 and the convex blocks formed in the concave surface 404 on the cavity wall of the conical bottom cavity 401 automatically pull the molded sample strips together, so that the sample strips are prevented from being adhered to the surface of the fixed die. After the mold is opened, the thimble 7 is ejected from the bottom of the ejection cavity 4, and because the angle of the semicircular reverse-pull inclined plane 402 is smaller than the included angle between the cavity wall of the conical bottom cavity 401 and the horizontal plane, the pull block formed in the pull groove 403 can be smoothly released from the semicircular reverse-pull inclined plane 402 in the ejection process of the thimble 7.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a tensile spline injection mold of plastics of antiseized mould which characterized in that, the tensile spline injection mold of plastics of antiseized mould include: cover half and movable mould, the intermediate position of cover half sets up the injecting glue mouth, 2 tensile spline molding chambers of plastics and T type runner are seted up to the symmetry on the movable mould, the extreme point of T type runner is located under the injecting glue mouth of cover half, the extreme point position of T type hot runner sets up ejecting chamber, ejecting chamber bottom is installed the drawing of patterns thimble, the upper portion in ejecting chamber sets up the structure of drawing conversely.

2. The anti-sticking plastic tensile spline injection mold as claimed in claim 1, wherein the T-shaped runner comprises a main runner and two branch runners separated to two sides, and a buffer cavity is arranged at the intersection point of the main runner and the branch runners.

3. The mold-release plastic tensile spline injection mold according to claim 2, wherein the interface of the runner with the plastic tensile spline-molding cavity is located at a middle position of one end of the plastic tensile spline-molding cavity, and the distance between the interface of the runner with the plastic tensile spline-molding cavity and the tail end of the runner is not less than half the width of the clamping end of the molded plastic tensile spline.

4. The anti-sticking plastic tensile spline injection mold as claimed in claim 1, wherein the counter-pulling structure arranged at the upper part of the ejection cavity is a semicircular counter-pulling inclined surface, the lower part of the ejection cavity is a tapered bottom cavity, the bottom of the tapered bottom cavity is the top of the ejector pin, the top surface of the tapered bottom cavity is flush with the bottom surface of the flow channel, the semicircular counter-pulling inclined surface is arranged around the top surface of the tapered bottom cavity and is positioned at the side opposite to the melt flowing direction in the flow channel, the included angle between the counter-pulling inclined surface and the horizontal plane is smaller than the included angle between the wall of the tapered bottom cavity and the horizontal plane, and the counter-pulling inclined surface is provided with an inward-pulling groove.

5. The anti-sticking plastic tensile spline injection mold according to claim 4, wherein the pull grooves are semicircular, and the depth of the pull grooves is 0.3-0.5 mm.

6. The anti-sticking plastic tensile spline injection mold according to claim 4, wherein a plurality of concave surfaces are arranged on the cavity wall of the conical bottom cavity.