CN103801660A

CN103801660A - Combination method of sand core

Info

Publication number: CN103801660A
Application number: CN201410076603.XA
Authority: CN
Inventors: 陈财坤; 何春华
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2014-03-04
Filing date: 2014-03-04
Publication date: 2014-05-21
Anticipated expiration: 2034-03-04
Also published as: CN103801660B

Abstract

The invention discloses a combination method of a sand core. The combination method comprises the steps of putting a first half sand core on a floor horizontally, forming a viscose overflow groove in the inner edge of a splitting-integrating surface of the first half sand core, and placing an appropriate amount of viscose on the splitting-integrating surface near the viscose overflow groove; coating graphite paste on the splitting-integrating surface near the viscose; butting a second half sand core with the first half sand core, combining the first half sand core and the second half sand core together to form an integral sand core; locking the integral sand core by using a sand locking screw rod and high-strength self-hardening sand; and scraping off the graphite paste which overflows out of a gap between the splitting-integrating surface of the first half sand core and the splitting-integrating surface of the second half sand core. Through the combination method of the sand core, the outer side of the viscose of the splitting-integrating surface is coated with the graphite paste, so that the viscose is prevented from overflowing outwards in the combination process to form air holes; meanwhile, the graphite paste can be squeezed in the combination process, so that the gap between two splitting-integrating surfaces can be filled with the graphite paste effectively; the generation of burrs and sand holes can be avoided; and the quality of products can be greatly improved.

Description

A kind of combined method of core

Technical field

The present invention relates to casting field, particularly a kind of combined method of core.

Background technology

In casting field, the core of large foundry goods is huger, and common point half formula that adopts is made a core, will in the middle of half core, empty to reach the effect of loss of weight, then two and half cores is combined to the complete core of formation.Conventional core assembly method is: 1, on deciliter face of one and half cores, conformal is coated viscose glue.2, another half core of coupling is docked with half core that scribbles viscose glue, two and half cores are combined.3, adopt lock core mode, locked two half and half cores.4, after two and half core lockings, on the combinatorial surface of core, spread oildag, inserted as far as possible in the gap of deciliter face formation of two and half cores.5, wipe the unnecessary oildag in core surface off.

Such combination makes viscose glue can not be too near to the foundry goods face (i.e. the outside of half core) that core forms, otherwise after combination, viscose glue is extruded, and causes a large amount of gas after its casting pouring, forms pore; Viscose glue can not be too near to again inner side simultaneously, otherwise foundry goods can form larger burr.It is firm not that this mode is inserted oildag in gap, has the risk coming off, and makes foundry goods produce sand holes, cannot in gap, fill up oildag simultaneously, easily causes the generation of foundry goods burr, is unfavorable for the postorder cleaning of foundry goods.。

Summary of the invention

The present invention is in order to overcome defect in above-mentioned prior art, by coat from inside to outside viscose glue and oildag on deciliter face before combination two and half cores, prevents that viscose glue from overflowing and improving the fastness of oildag, improves the quality of foundry goods.

For achieving the above object, the invention provides a kind of combined method of core, comprise the steps: the first half cores to lie on floor, a deciliter face inward flange for the first half cores is provided with viscose glue overflow launder, is placing appropriate viscose glue near on deciliter face of viscose glue overflow launder; Near the cream of graphiting on deciliter face of viscose glue; The second half cores are docked with the first half cores, and the first half cores and the second half cores are combined, and form an integral sand core; Utilize lock core screw rod and high strength self-hardening sand that integral sand core is locked; The oildag overflowing gap between deciliter face of the first half cores and deciliter face of the second half cores is wiped off.

In technique scheme, on the first half cores and the second half cores, be respectively equipped with lock core hole, step locked integral sand core is included in and lock core screw rod is installed on lock core hole and is added high strength self-hardening sand.

Core combination of the present invention is first coated onto oildag the outside of viscose glue on deciliter face, can prevent that viscose glue from outwards overflowing the pore causing in anabolic process, simultaneously anabolic process also can extruded anisotropic graphite cream, make oildag effectively fill up the gap between two deciliters faces, prevent the generation of burr, sand holes, product quality improves greatly.With respect to oildag is inserted in gap, directly on deciliter face, the difficulty of graphitization cream reduces greatly simultaneously, and operating efficiency improves greatly.

Accompanying drawing explanation

Fig. 1 is the top view of one and half cores of the present invention;

Fig. 2 is the structure chart after two and half core combinations of the present invention.

Mark the following drawings mark thereon by reference to the accompanying drawings:

1-the first half cores, 11-lightening grooves, 12-viscose glue overflow launder, 13-lock core hole, 14-deciliter face, 2-the second half cores, 3-gap.

The specific embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of the specific embodiment.

As shown in Figure 1, the end face that half core of the present invention (as the first half cores 1) is provided with multiple lightening grooves 11, half cores is deciliter face 14 for docking, and is provided with viscose glue overflow launder 12 in the inside edge of deciliter face 14.Be provided with the lock core hole 13 for the integral sand core after sealed docking in the one or both ends of half core.

As shown in Figure 2, after the first half cores 1 and the second half core 2 combinations, deciliter face 14 of the two forms gap 3.

Core combined method of the present invention is as follows:

(a) the first half cores 1 are lain on floor, placing appropriate viscose glue near on deciliter face 14 of viscose glue overflow launder 12.

(b) near the cream of graphiting on deciliter face 14 of viscose glue.

(c) the second half cores 2 are docked with the first half cores 1, the first half cores 1 and the second half cores 2 are combined, and form an overall core.

(d) lock core screw rod be installed on lock core hole 13 and added high strength self-hardening sand, the integral sand core that the first half cores 1 and the second half cores 2 are formed is locked.

(e) oildag overflowing from gap 3 is wiped off.

Disclosed is above only a specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.

Claims

1. a combined method for core, is characterized in that, comprises the steps:

The first half cores are lain on floor, and a deciliter face inward flange for described the first half cores is provided with viscose glue overflow launder, is placing appropriate viscose glue near on deciliter face of described viscose glue overflow launder;

Near the cream of graphiting on described deciliter face of described viscose glue;

The second half cores are docked with described the first half cores, and described the first half cores and described the second half cores are combined, and form an integral sand core;

Utilize lock core screw rod and high strength self-hardening sand locked described integral sand core;

The oildag overflowing gap between deciliter face of described the first half cores and deciliter face of described the second half cores is wiped off.

2. the combined method of core according to claim 1, it is characterized in that, on described the first half cores and described the second half cores, be respectively equipped with lock core hole, step locked described integral sand core is included in and lock core screw rod is installed on lock core hole and is added high strength self-hardening sand.