CN101941055B

CN101941055B - Boxing method of lost foam casting model and auxiliary compaction tool

Info

Publication number: CN101941055B
Application number: CN2010102785018A
Authority: CN
Inventors: 李平安; 秦银战; 徐方习; 郭鹏; 张哲�
Original assignee: Xichuan Jingeli Metallurgy & Foundry Co Ltd
Current assignee: Xichuan Jingeli Metallurgy & Foundry Co Ltd
Priority date: 2010-09-10
Filing date: 2010-09-10
Publication date: 2012-06-27
Anticipated expiration: 2030-09-10
Also published as: CN101941055A

Abstract

The invention discloses a boxing method of a lost foam casting model and an auxiliary compaction tool. The method mainly aims at a sand-filled model after three-dimensional compaction, and the compaction tool is selectively used in a cavity in a deformation-prone position or a holiday (especially a position not fully filled with sand at the top of the cavity in the vertical direction). The method comprises the following steps: inserting the compaction tool slantways into the dry sand for an appropriate depth, withdrawing while compacting, then inserting while vibrating, and repeating for a plurality of times to achieve the purpose of compacting the sand filled in the target point, thereby solving the problems of multi-cavity lost foam casting deformation and sand-in-iron and improving the qualification rate of the product. The auxiliary compaction tool has the advantages of simple structure and convenient operation, and can carry out selective local compaction on the sand mold, thereby achieving the purposes of avoiding casting deformation and sand-in-iron. The boxing method can be widely used in the lost foam casting of multi-cavity thin-wall parts.

Description

A kind of lost foam casting mold setting method

Technical field

The invention belongs to the lost foam casting technical field, be specifically related to lost foam casting mold setting method and auxiliary jolt ramming instrument in a kind of multiform cavity thin-wall spare lost foam casting.

Background technology

The whole nation many lost foam castings manufacturing enterprise that started rapidly in recent years, the lost foam casting process technology also becomes better and approaching perfection day by day.Iron burnt-in sand problem occurs but present lost foam casting problem on deformation and shape top of chamber leak iron and become the basic problem that is difficult to overcome, especially multiform cavity thin-wall spare shows particularly outstanding.

For solving the casting deformation problem; Enterprise adopts mostly: strengthen the preceding setting control of mold setting, improve three-dimensional jolt ramming effect, increase the flowability of sand; Reduce methods such as three-dimensional vibrating time; And prevent that iron burnt-in sand phenomenon from often adopting: strengthen coating intensity, prolong the three-dimensional jolt ramming time, also have at place, mould impression dead angle and preset methods such as sand.Own contradictory part between the method: anti-deformation requires to reduce time of vibration, and anti-iron burnt-in sand problem requires to increase time of vibration, attends to one thing and lose sight of another; Typing is nothing but to be adhesively fixed in advance with a kind of thing before the vanning, after the actual casting, has not been during iron liquid solidifies to act on; The foundry goods wall still to stressed big direction distortion, presets sand if fill, and efficiency is low again; Often difficulty is bigger in filling process, and injures other positions, and the large tracts of land result of use is not good.Because three-dimensional jolt ramming drives whole sandbox vibration, sand is pressed the certain orientation motion, often in complex geometry; The thin place of wall, particularly vertically (or tiltedly) to the not enough consolidation of lower gear sand position sand, crushes when watering cast iron liquid or breaks through coating; Cause iron liquid seepage, the iron burnt-in sand occurs.

For addressing the above problem, in the vanning process, suitably use three-dimensional jolt ramming according to foundry goods size, wall thickness situation, cavity direction; Aim at the shape chamber at variable form point and holiday place then; Carry out selectively local jolt ramming, the hole cooperates a spot of self-hardening sand, better effects if in the horizontal direction certainly; The foundry goods that is used self-hardening sand after all again seldom, such position is also seldom.

Summary of the invention

For solving the above-mentioned defective that prior art exists, the object of the present invention is to provide a kind of lost foam casting mold setting method, this method is easy to operate, saves large tracts of land and presets sand, has solved distortion and iron burnt-in sand problem, raises labour efficiency and product percent of pass.

Another purpose of the present invention provides a kind of auxiliary jolt ramming instrument, and is simple in structure, easy to operate, can reach anti-casting deformation to the optionally local jolt ramming of sand mold, the purpose of anti-iron burnt-in sand.

For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: this lost foam casting mold setting method; It is characterized in that by following prepared: the model that 1, will scribble coating and oven dry is put into the sandbox that is covered with dry sand; Add sand to one district and reach the standard grade, stop after opening three-dimensional jolt ramming instrument vibration appropriate time; 2, transfer to proper frequency with auxiliary jolt ramming instrument unlatching then, aim at the shape chamber at variable form point and holiday place, carry out selectively local jolt ramming, the limit vibration, the limit is retreated, and repeats several times; 3, then add sand to two district again and reach the standard grade, again with auxiliary jolt ramming instrument jolt ramming, sand is filled up toward weakness in the vibration processes middle and upper part after the three-dimensional jolt ramming, makes place, dead angle dry sand consolidation, thus compacting foundry goods coating; 4, add sand and fill up sandbox, three-dimensional jolt ramming.

A kind of auxiliary jolt ramming instrument; Have handle and vibrating body; It is characterized in that: said vibrating body inner chamber is provided with electromagnetic vibrator, and the head of vibrating body is bullet-headed, and the vibrating body outer surface is provided with wearing layer; The handle position is built-in with battery, and said handle is connected by telescopic connector with vibrating body.

Adopt the useful technique effect of technique scheme: this lost foam casting mold setting method, in the mold setting process, adopts and adorns sand three times, adorn sand at every turn after; By three-dimensional jolt ramming, and by auxiliary jolt ramming instrument selectively in the shape chamber at yielding or holiday place, the unreal position of vertical direction shape top of chamber back-up sand particularly, oblique cutting is gone into this place, chamber dry sand appropriate depth; Limit jolt ramming, the limit is retreated, and then inserts while vibrating, and repeats several times; Can accomplish, reach the purpose of impact point back-up sand consolidation, easy to operate; Save large tracts of land and preset sand, solve multiform chamber lost foam casting problem on deformation and iron burnt-in sand problem, improve product percent of pass.Auxiliary jolt ramming tool construction is simple, easy to operate, and handle is connected by telescopic connector with vibrating body; The length of stretching out according to action need scalable vibrating body, and flexible angled, can be to the optionally local jolt ramming of sand mold; Reach anti-casting deformation, the purpose of anti-iron burnt-in sand.

Description of drawings

Below in conjunction with accompanying drawing specific embodiment of the present invention is done further detailed explanation.

Fig. 1 is the sketch map of process of the present invention.

Fig. 2 is the structural representation of auxiliary jolt ramming instrument.

The specific embodiment

Lost foam casting mold setting method as shown in Figure 1, by following prepared: the model 3 that 1, will scribble coating and oven dry is put into the vacuum sandbox 1 that is covered with dry sand 2, adds sand to one district and reaches the standard grade, and stops after opening three-dimensional jolt ramming instrument appropriate time; 2, transfer to proper frequency with auxiliary jolt ramming instrument unlatching then, selectively aim at the shape chamber at variable form point and holiday place, go into 3. position, carry out local jolt ramming like oblique cutting, the limit vibration, the limit is retreated, and repeats several times; 3, then add sand to two district again and reach the standard grade, after the three-dimensional jolt ramming again with auxiliary jolt ramming instrument to 1. 2. 5. the position carry out jolt ramming, owing to sand past weakness in vibration processes middle and upper part is filled up; Reach 1. 2. 3. 5. place, dead angle dry sand consolidation, thus compacting foundry goods coating, in order to avoid should place's sand after the three-dimensional jolt ramming loose; Press unreal coating; Cause in the casting cycle iron liquid to break through or crush coating, the seepage molten iron causes foundry goods iron burnt-in sand; Solved and adopt to prolong three-dimensional vibrating time method, 4. foundry goods is located to receive downward pressure and is out of shape greater than 1. locating pressure, 5. locates to the outside outside problem of distortion of bigger pressure and core cavity of foundry goods.Also solved to adopt and preset sand technology, 1. 2. 3. located to be prone to leave the part body behind the big three-dimensional vibrating of area and occur leaking iron, and only can preset with a small amount of self-hardening sand 6. locating the horizontal direction circular hole.4, add sand and fill up sandbox, three-dimensional jolt ramming.

A kind of auxiliary jolt ramming instrument as shown in Figure 2 has handle 4 and vibrating body 7, and said handle 4 is connected by telescopic connector 6 with vibrating body 7, the length of stretching out according to action need scalable vibrating body, and flexible angled.Said vibrating body inner chamber is provided with electromagnetic vibrator 8, and vibration frequency 10-50Hz is adjustable, and amplitude is 2mm; The head of vibrating body is bullet-headed, and the vibrating body outer surface is provided with wearing layer, and the handle position is built-in with battery; Available 220V power source charges also can directly be inserted the 220V power supply and use.

Claims

1. lost foam casting mold setting method is characterized in that by following prepared:

(1), the model that will scribble coating and oven dry puts into the sandbox that is covered with dry sand, adds sand to one district and reaches the standard grade, stop after opening three-dimensional jolt ramming instrument vibration appropriate time;

(2), then open with auxiliary jolt ramming instrument and transfer to proper frequency, aim at the shape chamber at variable form point and holiday place, carry out selectively local jolt ramming, the limit vibration, the limit is retreated, and repeats several times;

(3), then add sand to two district again and reach the standard grade, again with auxiliary jolt ramming instrument jolt ramming, sand is filled up toward weakness in the vibration processes middle and upper part after the three-dimensional jolt ramming, makes place, dead angle dry sand consolidation, thus compacting foundry goods coating;

(4), adding sand fills up sandbox, three-dimensional jolt ramming.