CN206840598U - Injection mold without flash - Google Patents

Abstract

The utility model discloses a burr-free injection mold, which includes a template, the template is composed of an upper template and a lower template, a mold core is provided in the lower template, and a cavity for forming parts is provided in the mold core , the upper template is provided with a raw material tank for containing injection molding raw materials, and the raw material tank communicates with the cavity by means of a pipeline arranged in the upper template, and the raw material tank, pipeline and cavity Cooperate to complete the injection molding of the parts; the bottom of the mold core is at least provided with two springs for making the mold core and the lower surface of the upper template completely close, respectively located on both sides of the bottom of the mold core, and One end of the spring is fixed on the lower template, and the other end abuts against the lower surface of the mold core. The utility model is mainly reflected in: the structure is simple and exquisite, through the completely tight and seamless bonding between the mold core and the upper template, the occurrence of burrs and other phenomena is effectively avoided, and the yield rate of the product is also greatly improved. production efficiency.

Description

Flash-free injection molds

technical field

The utility model relates to an injection mold, in particular to an injection mold without burrs.

Background technique

Because silicone rubber materials have good oil resistance and solvent resistance, as well as excellent ductility and stretch resistance, they are widely used in the field of mechanical equipment, especially as seals in devices. .

However, due to the particularity of injection molding, processing companies generally use the same molds as other materials when processing silicone rubber parts. Due to the different characteristics of different materials, when using this kind of general mold to process silicone rubber parts, the processing results are often unsatisfactory.

Specifically, most of the current processing enterprises use a press-type mold structure in the molding process of small silicone rubber parts with inner holes. This type of mold usually has a three-plate flat-press molding structure. , first place the raw material in the molding area of the lower formwork plate, and then close the mold and pressurize the raw material to vulcanize and form. When this kind of molding scheme is used for product processing, in order to ensure that the finished product will not have the problem of material shortage, usually the weight of the raw materials used will be increased by 20% on the basis of the net weight of the product. In this way, the excess raw material will overflow on the parting surface of the mold during the mold clamping and pressurizing process, forming parting line burrs, which will cause the inner hole of the product to be blocked and affect the use of the product.

In summary, how to complete the molding of silicone rubber parts while avoiding the problem of inner hole blockage in the traditional processing process has become an urgent problem to be solved by those skilled in the art.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a burr-free injection mold.

The purpose of this utility model is achieved through the following technical solutions:

An injection mold without burrs, including a template, the template is composed of an upper template and a lower template, the lower template is provided with a mold core, the mold core is provided with a cavity for part molding, and the upper template is provided with There is a raw material trough for containing injection molding raw materials, and the raw material trough communicates with the cavity by means of a pipe arranged in the upper template, and the raw material trough, the pipeline and the cavity cooperate to complete the injection molding of the parts; The bottom of the mold core is provided with at least two springs for making the mold core and the lower surface of the upper template completely close to each other, which are respectively located on both sides of the bottom of the mold core, and one end of the spring is fixed on the On the lower template, the other end abuts against the lower surface of the mold core.

Preferably, the pipeline includes a gate and a runner, the inlet of the runner is connected to the raw material tank, the outlet of the runner is connected to the inlet of the gate, and the outlet of the gate is connected to the Cavity connection described above.

Preferably, the upper formwork is also provided with a cover plate, and a pressing block is fixed on the cover plate by bolts, and a small part of the pressing block extends into the raw material tank.

Preferably, the height from the lower surface of the cover plate to the lower surface of the pressing block is equivalent to the height of the raw material tank.

Preferably, the upper surface of the mold core protrudes from the upper surface of the lower template by a distance of 0.5-1 mm when the mold core is not under the pressure of the upper template.

The beneficial effect of the utility model is mainly reflected in: the structure is simple and exquisite, and through the completely tight and seamless fit between the mold core and the upper template, it can ensure that the remaining material cannot overflow between the mold core and the upper template during the injection molding process , effectively avoiding the occurrence of burrs and other phenomena, but also greatly improving the yield of products and improving production efficiency.

Description of drawings

Below in conjunction with accompanying drawing, technical scheme of the utility model is further described:

Fig. 1: The sectional view of the overall structure of the utility model.

detailed description

The utility model will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present utility model, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present utility model.

As shown in Figure 1, the utility model discloses a burr-free injection mold, including a template, the template is composed of an upper template 1 and a lower template 2, the lower template 2 is provided with a mold core 9, and the mold The core 9 is provided with a mold cavity for forming parts, and the upper template 1 is provided with a raw material tank 4 for holding injection molding raw materials, and the raw material tank 4 communicates with the The mold cavity is connected, and the three of the raw material tank 4, the pipeline 5 and the mold cavity cooperate to complete the injection molding of the parts; the pipeline 5 includes a gate 51 and a runner 52, and the entrance of the runner 52 is connected to the raw material tank. 4, the outlet of the runner 52 is connected with the inlet of the gate 51, and the outlet of the gate 51 is connected with the cavity.

The bottom of the mold core 9 is at least provided with two springs 8 for making the mold core 9 completely adhere to the lower surface of the upper template 1, which are respectively located on both sides of the bottom of the mold core 9, and the One end of the spring 8 is fixed on the lower template 2, and the other end abuts against the lower surface of the mold core 9, and the spring 8 is used to completely tighten the mold core 9 to the lower surface of the upper template 1. There is no gap between the two, which effectively avoids the occurrence of burrs and other phenomena, and also greatly improves the yield of products and improves production efficiency.

The upper template 1 is also provided with a cover plate 6, and a pressing block 62 is fixed on the cover plate 6 by bolts 61, and at least part of the pressing block 62 extends into the raw material tank 4, and the cover plate The height from the lower surface of 6 to the lower surface of the pressing block 62 is equivalent to the height of the raw material tank 4 . Most importantly, the upper surface of the mold core 9 protrudes from the upper surface of the lower template 2 by a distance of 0.5-1 mm when the mold core 9 is not under the pressure of the upper template 1, and the When the mold core 9 is under the pressure of the upper template 1, the two are in wide plane contact, so the mold core 9 will not shake during injection molding. Certainly, in actual production, the size of the spring force can also be adjusted to make the stability of the mold core 9 more reliable.

The beneficial effect of the utility model is mainly reflected in: the structure is simple and exquisite, and through the completely tight and seamless fit between the mold core and the upper template, it can ensure that the remaining material cannot overflow between the mold core and the upper template during the injection molding process , effectively avoiding the occurrence of burrs and other phenomena, but also greatly improving the yield of products and improving production efficiency.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible implementation modes of the present utility model, and they are not used to limit the protection scope of the present utility model. Embodiments or modifications should be included within the protection scope of the present utility model.

Claims (5)

1. the injection mold without flash, including template, the template is by cope plate（1）And lower template（2）Composition, the lower template （2）It is interior to be provided with die（9）, the die（9）The interior die cavity being provided with for forming parts, the cope plate（1）Interior be provided with is used for Hold the raw material tank of injection raw material（4）, the raw material tank（4）By being arranged on the cope plate（1）Interior pipeline（5）With it is described Die cavity is connected, the raw material tank（4）, pipeline（5）And die cavity three coordinates the injection molding for completing part；It is characterized in that： The die（9）Bottom at least provided with making the die（9）With the cope plate（1）Lower surface be close to completely two Root spring（8）, respectively positioned at the die（9）The both sides of bottom, and the spring（8）One end be fixed on the lower template （2）On, the other end and the die（9）Lower surface abut.

2. the injection mold of no flash according to claim 1, it is characterised in that：The pipeline（5）Including cast gate（51） And runner（52）, the runner（52）Entrance and the raw material tank（4）Connection, the runner（52）Outlet and the cast gate （51）Entrance be connected, the cast gate（51）Outlet be connected with the die cavity.

3. the injection mold of no flash according to claim 2, it is characterised in that：The cope plate（1）On be additionally provided with lid Plate（6）, the cover plate（6）On pass through bolt（61）It is fixed with a briquetting（62）, and the briquetting（62）At least part Extend to the raw material tank（4）It is interior.

4. the injection mold of no flash according to claim 3, it is characterised in that：The cover plate（6）Lower surface to institute State briquetting（62）The height of lower surface is equivalent to the raw material tank（4）Height.

5. the injection mold of no flash according to any one of claims 1 to 4, it is characterised in that：The die（9）Upper table Face is in the die（9）Not by the cope plate（1）The lower template is protruded from the case of pressure（2）Upper surface distance For 0.5-1 millimeters.