CN102974772A

CN102974772A - Shaft box mold of rail wagon bogie

Info

Publication number: CN102974772A
Application number: CN2012105252495A
Authority: CN
Inventors: 曹贵实; 张淑荣; 李艳秋; 鞠花; 郝施奇; 徐桂兰
Original assignee: Qiqihar Railway Rolling Stock Co Ltd
Current assignee: CRRC Qiqihar Rolling Stock Co Ltd
Priority date: 2012-12-07
Filing date: 2012-12-07
Publication date: 2013-03-20
Anticipated expiration: 2032-12-07
Also published as: CN102974772B

Abstract

The invention provides a shaft box mold of a rail wagon bogie, which comprises an upper sand box, a lower sand box and a plurality of sand cores arranged in the upper sand box and the lower sand box, wherein running gates and side gates and inner gates which are communicated with the running gates are formed in the upper sand box and the lower sand box; at least one dead head is formed in the upper sand box; and the inner gates are respectively communicated with a cavity which is formed in the upper sand box and is used for pouring a reinforcement rib at the lower part of a cast and a cavity which is formed inside the lower sand box and is used for pouring the other reinforcement rib at the lower part of the cast. The part of the cast, which is subjected to low stress, can be found out by analyzing the working stress situation of the cast; the inner gates are formed at the positions of the two reinforcement ribs at the lower part of the cast; the wall of the part is 18mm thick; the inner gates are moved to the positions of the two reinforcement ribs, so that gates can be prevented from being blocked by the cast; the shortcomings of shrinkage and looseness of the cast can be overcome; and therefore, the safety of the shaft box cast during running can be improved.

Description

The journal box of truck of rail wagon casting mold

Technical field

The present invention relates to foundry engieering, relate in particular to a kind of journal box of truck of rail wagon casting mold, belong to rolling stock manufacturing technology field.

Background technology

80 tons of present largest domestic capacities of common railway lorry/each, the present largest domestic tonnage of extraordinary rail transporter mainly transports main equipment and heavy components such as 450 tons of schnabel cars; The axle box product is the main stressed steel-casting on locomotive crane and the Special railway transport vehicle, belongs to the complicated foundry goods of structure; The axle box casting mold that conventional cast technique is used is usually by cope 1, drag box 2, seven cores and a spherical feeder 4 form, seven cores comprise the first core 1a, the second core 2a, the 3rd core 3a, the 4th core 4a, the 5th core 5a, the 6th core 6a and the 7th core 7a, referring to Fig. 2-4, the runner gate and the ingate 11 that have down gate 10 in cope 1 and the drag box 2 and be communicated with this down gate 10, ingate 11 is located at cope 1 top, introduce from axle box foundry goods top, rising head 4 is hemispherical and is open riser, adopt flange to be placed on the foundry goods upper surface of cope 1, rising head 4 diameters are much larger than the axle box casting section thickness; The structure of axle box foundry goods is referring to Fig. 1, and the axle box foundry goods is assembled on the bogie of vehicle to run parts, and load is larger during vehicle operating; By analysis because cast gate is located at core inside, its down gate 10, runner gate 20 sectional areas are larger, ingate 11 spacings are less, heat radiation is slower in core, Sui the progressively introducing of molten steel, cast later stage cast gate position heat to around distribute more and more difficultly, this position formation localized hyperthermia district is thermal center.The cast gate introducing place wall thickness 27mm of foundry goods is this foundry goods thickest place's accumulation of heat at most (foundry goods average wall thickness 17mm), and for single-casting, the heat that this place absorbs cast gate is maximum, and heat is the most difficult to external diffusion, is the slowest position of whole casting temperature decline.Cause at last close cast gate place, solidifying event position of foundry goods, form cast gate prior to casting solidification, make foundry goods be later than ingate and solidify, finally form the anti-teeming mouth of foundry goods, its as a result cast gate introducing position core cavity produces shrinkage cavity or shrinkage defect.The axle box foundry goods shrinkage cavity or shrinkage defect occur in ingate 11 introducing place inside, and this is located into the main stressed position of foundry goods, if it is larger to the vehicle operating security implication shrinkage cavity defect to occur.

Rising head of the prior art is open riser, and open riser refers to that short transverse connects the rising head of cope, and the rising head diameter is much larger than the wall thickness of need feeding foundry goods, and its riser feeding ability is undoubted, but that gate location is selected is even more important.280 millimeters of rising head diameters, 87 kilograms of rising head weight are because rising head is removed time-consuming, the effort of cutting, so the integrated cost of foundry goods is higher.

Prior art feeding head nearly cover foundry goods upper surface, rising head top almost spherical, this riser feeding ability is stronger, but casting cleaning time cutting rising head is time-consuming, effort, and the product yield of foundry goods is lower, causes casting cost higher.

Summary of the invention

The invention provides a kind of journal box of truck of rail wagon casting mold, be used for overcoming defective of the prior art, reduce shrinkage cavity or shrinkage defect, improve the security of axle box foundry goods in running.

Journal box of truck of rail wagon casting mold provided by the invention, this casting mold comprise cope, drag box and be arranged on described cope and drag box in a plurality of cores, the runner gate and the ingate that have down gate in described cope and the drag box and be communicated with this down gate, have at least one rising head on the described cope, described ingate is communicated with respectively inner die cavity and the inner die cavity that is used for another reinforcement of pouring cast part bottom of drag box that is used for pouring cast part bottom one reinforcement of described cope.

Journal box of truck of rail wagon casting mold provided by the invention by analyzing the work stressing conditions of foundry goods, finds the stressed smaller part of foundry goods position; Ingate is located at two reinforcement positions, foundry goods bottom, and this locates wall thickness 18mm, ingate is moved on to can prevent the anti-teeming mouth of foundry goods herein, reaches to eliminate foundry goods shrinkage cavity and porosity defective, thereby improves the security of axle box foundry goods in running.

Description of drawings

Fig. 1 is axle box foundry goods perspective view;

Fig. 2 is the front view of prior art casting mold;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is the left view of Fig. 2;

The front view of the embodiment one that Fig. 5 provides for the embodiment of the invention;

Fig. 6 is the top view of Fig. 5;

Fig. 7 is the left view of Fig. 5;

The partial enlarged drawing of the embodiment one that Fig. 8 provides for inventive embodiments;

Fig. 9 is the structural representation that contains the core of limited step.

The specific embodiment

Present embodiment provides a kind of journal box of truck of rail wagon casting mold, shown in Fig. 5-7, this casting mold comprises cope 1, drag box 2 and is arranged on a plurality of cores in cope 1 and the drag box 2, the runner gate 20 and the ingate 11 that have down gate 10 in cope 1 and the drag box 2 and be communicated with this down gate 10, have at least one rising head 4 on the cope 1, ingate 11 is communicated with respectively cope 1 inner die cavity and the drag box 2 inner die cavities that are used for another reinforcement 102 of pouring cast part 100 bottoms that are used for pouring cast part 100 bottoms one reinforcement 101.The structure of foundry goods 100 as shown in Figure 1.

As the further improvement of above-described embodiment, rising head 4 is the blind riser more than three and is distributed at least in the cope 1 in the die cavity of pouring cast part 100 ring-type barrels 103.Rising head 4 is specially Long Circle.The structure of foundry goods 100 as shown in Figure 1.Blind riser refers to that short transverse do not stretch out the casting mold end face, all the top riser or the side riser that are coated by sandbox of rising heads.

In order to solve the deficiency of rising head in the prior art, should dwindle Riser Dimensions, also should satisfy simultaneously the feeding requirement of foundry goods.Analyze the casting mold characteristics, study its feeding demand, this programme takes to cancel whole flanging open riser, changes three little blind risers of oval shape into, rising head directly is placed on the position that needs feeding.Change rear rising head volume and reduce, its cutting quantity obviously reduced when rising head was removed; Obviously improve the product yield of foundry goods, reduced casting cost.

As the preferred embodiment of above-described embodiment, with the ingate 11 of cope 1 internal communication be that two and interval arrange, with the ingate 11 of drag box 2 internal communication be that two and interval arrange.

Ingate divides upper and lower two-layer totally four road ingates, its at the middle and upper levels the ingate correspondence in cope, pour into a mould, lower floor's ingate correspondence is poured into a mould in drag box, to strengthen with the spacing of two ingates of layer, can make the molten steel of introducing disperse the minimizing heat to concentrate, make casting sprue introducing place avoid forming thermal center, realize that foundry goods is prior to gate solidification, can prevent the anti-teeming mouth of foundry goods, reach and eliminate foundry goods shrinkage cavity and porosity defective.

Such as Fig. 8, shown in Figure 9, for being provided with at least two limited steps 5 on the core that down gate 10 and ingate 11 are set, the corresponding stopper slot that cooperates with this limited step 5 the setting of drag box inwall.

Shown in Fig. 5-9, have six cores in the present embodiment, comprise the first core 1a, the 3rd core 3a, the 4th core 4a, the 5th core 5a, the 6th core 6a and the 7th core 7a, because the 5th core 5a is namely washed away by the cast gate molten steel for the core that down gate 10 and ingate 11 are set unstable, and with the 6th core 6a, the 7th core 7a contact portion is less, easily bump brokenly the 6th core 6a and the 7th core 7a contact site, for preventing the 5th core 5a displacement, increase by two place's core positive stop lug boss 5 at the 5th core 5a, can prevent that the 5th core 5a play from making core extruding drop and guarantee that the casting section thickness size is accurate.Positive stop lug boss 5 is seen among Fig. 5 among the 5th core 5a two rectangular trapezium structures and Fig. 8 and Fig. 9.

The rising head size directly affects casting process yield, and former scheme casting process yield is 49%, and rising head is adjusted forward and backward gross weight and is respectively: 87 kilograms and 42.8 kilograms, casting process yield is increased to 63%.Rising head is removed cutting quantity and is reduced thereupon.Cancelled the 2# core after the optimum gate, casting mold reduces a kind of core.Make coremaking and all corresponding minimizings of core setter work amount.Improvement by cast gate and rising head makes manufacturing and the corresponding simplification of scale removal process, and the integrated cost of foundry goods reduces.

It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.

Claims

1. journal box of truck of rail wagon casting mold, this casting mold comprise cope, drag box and be arranged on described cope and drag box in a plurality of cores, the runner gate and the ingate that have down gate in described cope and the drag box and be communicated with this down gate, has at least one rising head on the described cope, it is characterized in that described ingate is communicated with respectively inner die cavity and the inner die cavity that is used for another reinforcement of feeding foundry goods bottom of drag box that is used for pouring cast part bottom one reinforcement of described cope.

2. journal box of truck of rail wagon casting mold according to claim 1 is characterized in that, described rising head is the blind riser more than three and is distributed at least in the cope in the die cavity of feeding foundry goods ring-type barrel.

3. journal box of truck of rail wagon casting mold according to claim 1 and 2 is characterized in that, with the ingate of cope internal communication be that two and interval arrange, with the ingate of drag box internal communication be that two and interval arrange.

4. journal box of truck of rail wagon casting mold according to claim 1 and 2 is characterized in that, described rising head is Long Circle.

5. journal box of truck of rail wagon casting mold according to claim 1 and 2, it is characterized in that, for being provided with at least two limited steps on the core that down gate and ingate are set, have two corresponding stopper slots that cooperate with this limited step on the described drag box inwall.