阅读说明：本技术 一种有效提高合模线强度的吹塑模具 (Blow mold capable of effectively improving joint line strength ) 是由 彭勇辉 肖科 于 2021-05-29 设计创作，主要内容包括：本发明公开了一种有效提高合模线强度的吹塑模具,其采用双刀口设计,合模时产品合模线会变厚且强度大幅提升,产品不易变形；而且在合模吹塑时,通过凹槽使合模面各部位压差保持均匀,使得漏胶均匀,可有效排除合模面上气体,防止形成气孔,提升良品率；通过凸棱设计,可有效定位合模,简化合模工作,提升合模精准度。(The invention discloses a blow mold capable of effectively improving the strength of a joint line, which adopts a double-cutter-edge design, so that the joint line of a product can be thickened and the strength is greatly improved during mold closing, and the product is not easy to deform; when the die is closed and blown, the pressure difference of all parts of the die closing surface is kept uniform through the grooves, so that the glue leakage is uniform, the gas on the die closing surface can be effectively discharged, the formation of air holes is prevented, and the yield is improved; through the design of the convex edge, the die can be effectively positioned and closed, the die closing work is simplified, and the die closing precision is improved.)

1. The utility model provides an effectively improve blowing mould of joint line intensity which characterized in that: blow mold includes cover half (1), movable mould (2), cover half (1) and movable mould (2) are equipped with air flue (3) and mould casing (5) respectively, cover half (1) and movable mould (2) are inside to be die cavity (4), air flue (3) link up extremely die cavity (4), mould casing (5) on cover half (1) are equipped with first edge of a knife (6) and second edge of a knife (7) respectively by interior outside to, first edge of a knife (6) with form recess (8) between the second edge of a knife (7).

2. A blow mold according to claim 1, wherein: the mould casing on the movable mould (2) be equipped with can with bead (9) of recess (8) joint, the height of bead (9) is less than the degree of depth of recess (8).

3. A blow mold according to claim 1, wherein: the first knife edge (6) adopts an inclined design at one side close to the groove (8), and the included angle alpha between the first knife edge and the die assembly surface is larger than 90 degrees.

4. A blow mold according to claim 3, wherein: the angle of alpha is 95-105 deg.

5. A blow mold according to claim 3, wherein: one side of the convex rib (9) corresponding to the inclined surface of the first knife edge (6) is also designed to be inclined, and the included angle beta between the convex rib and the die assembly surface is larger than alpha.

6. A blow mold according to claim 5, wherein: the beta-alpha is controlled at 5-10 degrees.

Technical Field

The invention relates to the field of molds, in particular to a blow mold capable of effectively improving the strength of a joint line.

Background

In the blow molding industry, a blow molding machine is used for spraying molten liquid plastic, and then a plastic body is blown to a pre-prepared blow mold with a certain shape by using the wind power blown out by the machine, and after cooling, the mold is opened to obtain a desired blow molded product. As shown in fig. 1 and 2, a blow mold used in the related art generally includes a fixed mold 1 and a movable mold 2, the fixed mold 1 and the movable mold 2 are respectively provided with an air duct 3 and a mold housing 5, a cavity 4 is formed inside the fixed mold 1 and the movable mold 2, the air duct 3 penetrates the cavity 4, and the mold housing 5 is a knife edge at a mold clamping surface.

In the prior art, because the blow mold cannot achieve the effect of complete closing, a small amount of glue leaks at the mold closing position of the blow mold, and a mold closing line is formed on the surface of an obtained blow molding product. The appearance of the blow-molded product is influenced due to the existence of the joint line, and meanwhile, the strength of the blow-molded product forms a weak point at the position of the joint line, so that the quality of the blow-molded product is influenced; meanwhile, the glue leakage amount at the mould closing position of the blow mould is not uniform, so that the defects of air holes and the like are easily formed at the mould closing line position of a blow-moulding product, and the yield is reduced.

The invention discloses a blow mold capable of effectively improving the strength of a joint line, which has the advantages of simple mold closing and positioning, thickened and greatly improved strength of the joint line of a blow molding product, difficult deformation of the product and improved yield.

Disclosure of Invention

The invention discloses a blow mold capable of effectively improving the strength of a joint line, which has the advantages of simple mold closing and positioning, thickened and greatly improved strength of the joint line of a blow molding product, difficult deformation of the product and improved yield.

The utility model provides an effectively improve blowing mould of joint line intensity, includes cover half 1, movable mould 2, cover half 1 and movable mould 2 are equipped with air flue 3 and mould casing 5 respectively, cover half 1 and movable mould 2 are inside to be die cavity 4, air flue 3 link up to die cavity 4, mould casing 5 on the cover half 1 is equipped with first edge of a knife 6 and second edge of a knife 7 respectively by inside to outside, first edge of a knife 6 with form recess 8 between the second edge of a knife 7.

The design can make the joint line become thick when blow molding after die assembly, prevent the air holes from being formed on the die assembly surface and improve the yield.

Further, the mould shell on the movable mould 2 is provided with a convex edge 9 which can be connected with the groove 8 in a clamped mode, and the height of the convex edge 9 is smaller than the depth of the groove 8.

The design can simplify the die assembly positioning work and improve the working efficiency; and after the die is closed, the groove 8 is filled, so that the glue leakage amount is small during blow molding, and the post-treatment is convenient.

Furthermore, the first knife edge 6 is obliquely designed on one side close to the groove 8, and the included angle alpha between the first knife edge and the die assembly surface is larger than 90 degrees. Preferably, the angle α is 95 ° to 105 °.

Furthermore, one side of the convex rib 9 corresponding to the inclined surface of the first knife edge 6 is also designed in an inclined mode, and the included angle beta between the convex rib and the die assembly surface is larger than alpha. Preferably, the beta-alpha is controlled to be 5-10 degrees.

The invention has the advantages that:

1. according to the invention, the double-knife-edge design is adopted, the product die-clamping line can become thick and the strength is greatly improved during die assembly, and the product is not easy to deform;

2. according to the double-knife-edge design, during die assembly and blow molding, the pressure difference of each part of the die assembly surface is kept uniform through the groove, so that glue leakage is uniform, gas on the die assembly surface can be effectively discharged, air holes are prevented from being formed, and the yield is improved;

3. the convex edge design can effectively position and mold closing, simplify mold closing work and improve mold closing accuracy;

4. the first knife edge is obliquely designed, so that the thickness of a joint line can be further improved, air holes cannot be formed on the joint surface, and the yield is improved;

5. the angle alpha is too small, and the effect of the inclined design of the first knife edge is not obvious; if the angle alpha is too large, the effect of the double-knife-edge design is weakened;

6. if the angle of beta-alpha is too small, the leaking glue is not smoothly exhausted on the die assembly surface; if the angle of β - α is too large, the amount of leakage increases.

Drawings

FIG. 1 is a schematic view of a prior art clamping assembly;

FIG. 2 is a schematic view of a stationary mold clamping surface of the prior art;

FIG. 3 is a cross-sectional view of embodiment 1 of the present invention;

FIG. 4 is a sectional view showing the clamping in embodiment 1 of the present invention;

FIG. 5 is a schematic plan view of a stationary mold according to embodiment 1 of the present invention;

FIG. 6 is a cross-sectional view of example 2 of the present invention;

FIG. 7 is a sectional view showing the closing of the mold in embodiment 2 of the present invention;

FIG. 8 is a cross-sectional view of example 3 of the present invention;

FIG. 9 is a sectional view showing the clamping in embodiment 3 of the present invention;

FIG. 10 is a partial enlarged view of a double-edge when closing the dies according to embodiment 3 of the present invention;

in the figure, 1-fixed die, 2-movable die, 3-air passage, 4-cavity, 5-die shell, 6-first knife edge, 7-second knife edge, 8-groove and 9-rib

Detailed Description

Example 1

The utility model provides a blow mold, includes cover half 1, movable mould 2, cover half 1 and movable mould 2 are equipped with air flue 3 and mould casing 5 respectively, cover half 1 and movable mould 2 are inside to be die cavity 4, air flue 3 link up extremely die cavity 4, mould casing 5 on the cover half 1 is equipped with first edge of a knife 6 and second edge of a knife 7 by inside to outside respectively, first edge of a knife 6 with form recess 8 between the second edge of a knife 7.

Example 2

On the basis of embodiment 1, the mould shell on the movable mould 2 is provided with a rib 9 which can be clamped with the groove 8, and the height of the rib 9 is smaller than the depth of the groove 8.

Example 3

On the basis of the embodiment 2, the first blade opening 6 is obliquely designed at one side close to the groove 8, and the included angle alpha between the first blade opening and the die clamping surface is 100 degrees.

Example 4

In addition to the embodiment 3, the edge of the rib 9 corresponding to the inclined surface of the first knife edge 6 is also designed to be inclined, and the included angle beta between the edge and the die surface is 106 degrees.

Comparative example 1

Blow moulds as described in the background.

Comparative example 2

A blow mold which differs from example 3 in that α is 110 °.

Comparative example 3

A blow mold which differs from example 4 in that β is 115 °.

And (3) testing results:

the blow molding dies of 40cm by 25cm were processed according to the parameters described in the above examples and comparative examples, and the sizes of the fixed die, the movable die, the air duct, the die case and the cavity were kept consistent, and then 100 examples of each product were obtained by blow molding the same batch of PE.

1. Observing whether a product mold closing line has air holes, marking the air holes as defective products, and calculating the yield;

2. taking 10 cases of non-pore good products, measuring the thickness of a joint line and averaging;

simultaneously measuring the height, width and thickness (the thickness direction is vertical to the joint surface) of the product, and comparing the height, width and thickness with the size of the cavity to measure the shrinkage deformation rate of the product;

meanwhile, the tensile strength of the position of the joint line is tested according to GB/T1040-.

As can be seen from the above table, the double-knife-edge design is adopted, the product joint line can become thick and the strength is greatly improved during die assembly, the product deformation rate is reduced, the air holes formed on the joint line can be effectively prevented, and the yield is improved;

the first knife edge is obliquely designed, so that the thickness of the die assembly line and the yield can be further improved.

And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.