CN102974772B

CN102974772B - Shaft box mold of rail wagon bogie

Info

Publication number: CN102974772B
Application number: CN201210525249.5A
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: 2015-02-04
Anticipated expiration: 2032-12-07
Also published as: CN102974772A

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

Shaft box mold of rail wagon bogie

Technical field

The present invention relates to foundry engieering, particularly relate to a kind of shaft box mold of rail wagon bogie, belong to rolling stock manufacturing technology field.

Background technology

The current largest domestic capacity of common railway lorry 80 tons/each, the current largest domestic tonnage of extraordinary rail transporter, as 450 tons of schnabel cars mainly transport main equipment and heavy components, axle box product is the main stressed steel-casting on locomotive crane and Special railway transport vehicle, belongs to the foundry goods that structure is more complicated, the axle box casting mold that conventional casting techniques uses is usually by cope 1, drag box 2, seven cores and a spherical feeder 4 form, seven cores comprise the first core 1a, second core 2a, 3rd core 3a, 4th core 4a, 5th core 5a, 6th core 6a and the 7th core 7a, see Fig. 2-4, the runner gate that in cope 1 and drag box 2, there is down gate 10 and be communicated with this down gate 10 and ingate 11, ingate 11 is located at cope 1 top, introduce from axle box foundry goods top, rising head 4 is hemispherical and is open riser, flange is adopted to be placed on the foundry goods upper surface of cope 1, rising head 4 diameter is much larger than axle box casting section thickness, the structure of axle box foundry goods is see Fig. 1, and axle box foundry goods is assembled on the bogie of vehicle to run parts, and during vehicle operating, load is larger, by analysis because cast gate is located at sand core internal, its down gate 10, runner gate 20 sectional area are larger, ingate 11 spacing is less, dispel the heat in core slower, Sui the progressively introducing of molten steel, phase cast gate position heat distributes more and more difficult to surrounding after being cast, and this position forms district of localized hyperthermia and thermal center.The cast gate introducing place wall thickness 27mm of foundry goods be this foundry goods thickest place's accumulation of heat at most (foundry goods average wall thickness 17mm), for single-casting, the heat that this place absorbs cast gate is maximum, and heat is the most difficult to external diffusion, is that whole casting temperature declines the slowest position.Cause foundry goods finally near cast gate place, to form cast gate prior to casting solidification, make foundry goods be later than ingate and solidify, the anti-teeming mouth of final formation foundry goods in solidifying event position, its result cast gate introduces position core cavity generation shrinkage cavity or shrinkage defect.There is shrinkage cavity or shrinkage defect in ingate 11 introducing place inside in axle box foundry goods, and this place is the main forced position of foundry goods, if occur, shrinkage cavity defect is larger to vehicle operating security implication.

Rising head of the prior art is open riser, and open riser refers to the rising head of the through cope of short transverse, and rising head diameter is much larger than the wall thickness needing feeding foundry goods, and its riser feeding ability is undoubted, but gate location is selected even more important.Rising head diameter 280 millimeters, rising head weight 87 kilograms, because rising head is removed, cutting is time-consuming, effort, therefore 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 comparatively strong, but cuts during casting cleaning that 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 shaft box mold of rail wagon bogie, for overcoming defect of the prior art, reducing shrinkage cavity or shrinkage defect, improving the security of axle box foundry goods in running.

Shaft box mold of rail wagon bogie provided by the invention, this casting mold comprises cope, drag box and is arranged on the multiple cores in described cope and drag box, the runner gate that in described cope and drag box, there is down gate and be communicated with this down gate and ingate, described cope has at least one rising head, described ingate is communicated with the inner die cavity for pouring cast part bottom one reinforcement of described cope and the inner die cavity for another reinforcement of pouring cast part bottom of drag box respectively.

Shaft box mold of rail wagon bogie provided by the invention, by analyzing the work stressing conditions of foundry goods, finds the stressed smaller part position of foundry goods; Ingate is located at reinforcement position, two, foundry goods bottom, this place wall thickness 18mm, is moved on to by ingate and can prevent the anti-teeming mouth of foundry goods herein, reaches and eliminates foundry goods shrinkage cavity and porosity defect, thus improve the security of axle box foundry goods in running.

Accompanying drawing explanation

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 present 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 of the core containing limited step.

Detailed description of the invention

The present embodiment provides a kind of shaft box mold of rail wagon bogie, as illustrated in figs. 5-7, this casting mold comprises cope 1, drag box 2 and is arranged on cope 1 and the multiple cores in drag box 2, the runner gate 20 that in cope 1 and drag box 2, there is down gate 10 and be communicated with this down gate 10 and ingate 11, cope 1 has at least one rising head 4, ingate 11 is communicated with die cavity and the inner die cavity being used for another reinforcement 102 of pouring cast part 100 bottom of drag box 2 that cope 1 inside is used for pouring cast part 100 bottom one reinforcement 101 respectively.The structure of foundry goods 100 as shown in Figure 1.

As the improvement further of above-described embodiment, rising head 4 is the blind riser of more than three and is at least distributed in the die cavity for pouring cast part 100 ring-type barrel 103 in cope 1.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 does not stretch out casting mold end face, and whole rising head is by the coated top riser of sandbox or side riser.

In order to solve the deficiency of rising head in prior art, should Riser Dimensions be reduced, also should meet the feeding requirement of foundry goods simultaneously.Analyze casting mold feature, study its feeding demand, this programme is taked to cancel overall flanging open riser, changes three little blind risers of kidney ellipsoid into, rising head is directly placed on the position needing feeding.Change rear rising head volume to reduce, when rising head is removed, its cutting quantity obviously reduces; Significantly improve the product yield of foundry goods, reduce casting cost.

As the preferred embodiment of above-described embodiment, and the inner ingate 11 be communicated with of cope 1 is two and interval is arranged, and the inner ingate 11 be communicated with of drag box 2 is two and interval is arranged.

Ingate divides upper and lower two-layer totally four road ingates, its at the middle and upper levels ingate correspondence pour into a mould in cope, lower floor's ingate correspondence is poured into a mould in drag box, the spacing of two ingates of same layer is strengthened, the molten steel dispersion of introducing can be made to reduce heat concentrate, make casting sprue introducing place avoid the formation of thermal center, realize foundry goods prior to gate solidification, the anti-teeming mouth of foundry goods can be prevented, reach and eliminate foundry goods shrinkage cavity and porosity defect.

As shown in Figure 8, Figure 9, on the core that down gate 10 and ingate 11 are set, be provided with at least two limited steps 5, the corresponding stopper slot that setting coordinates with this limited step 5 on drag box inwall.

As shown in figures 5-9, six cores are had in the present embodiment, comprise the first core 1a, 3rd core 3a, 4th core 4a, 5th core 5a, 6th core 6a and the 7th core 7a, because the core of the 5th core 5a namely for arranging down gate 10 and ingate 11 washes away instability by cast gate molten steel, and with the 6th core 6a, 7th core 7a contact portion is less, easily touch brokenly the 6th core 6a and the 7th core 7a contact site, be shifted for preventing the 5th core 5a, 5th core 5a increases by two place's core positive stop lug boss 5, can prevent the 5th core 5a play from making core extrude drop and guarantee that casting section thickness size is accurate.Positive stop lug boss 5 to be shown in Fig. 5 two rectangular trapezium structures and Fig. 8 and Fig. 9 in the 5th core 5a.

Rising head size directly affects casting process yield, and former scheme casting process yield is 49%, and rising head adjusts forward and backward gross weight respectively: 87 kilograms and 42.8 kilograms, casting process yield is increased to 63%.Rising head is removed cutting quantity and is reduced thereupon.Eliminate 2# core after optimum gate, casting mold reduces a kind of core.Coremaking and core setter is made to measure all corresponding minimizing.Make manufacture and the corresponding simplification of scale removal process by the improvement of cast gate and rising head, the integrated cost of foundry goods reduces.

Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims

1. a shaft box mold of rail wagon bogie, this casting mold comprises cope, drag box and is arranged on the multiple cores in described cope and drag box, the runner gate that in described cope and drag box, there is down gate and be communicated with this down gate and ingate, described cope has at least one rising head, it is characterized in that, described ingate is communicated with the inner die cavity for pouring cast part bottom one reinforcement of described cope and the inner die cavity for another reinforcement of feeding foundry goods bottom of drag box respectively; Described ingate is located at reinforcement position, two, foundry goods bottom.

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

3. shaft box mold of rail wagon bogie according to claim 1 and 2, is characterized in that, and the inner ingate be communicated with of cope is two and interval is arranged, and the inner ingate be communicated with of drag box is two and interval is arranged.

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

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