A kind of wheel brake casting method
Technical field
The present invention relates to casting technology field, be specifically related to a kind of wheel brake casting method.
Background technology
The manufacture method of present stage automobile brake drum blank is mainly the casting of V method, the casting of V method is to utilize plastic sheeting to seal sandbox, by air in vacuum-pumping system extraction type, pressure differential is had inside and outside casting mold, make dry sand closely knit, there is needed for formation the die cavity of some strength, make casting solidification through lower core, mould assembling, cast evacuation, releasing negative pressure, molding sand is therewith defeated and dispersed and obtain foundry goods.The cast(ing) surface that this technique is produced is bright and clean, clear-cut, uniform in material, being different from tradition sand casting great advantage is not use binding agent, significantly alleviate sand process work, the amount of labour of foundry goods scab cleaning also greatly reduces, the old sand response rate, up to more than 95%, is suitable for multi items single and mini-batch production and production in enormous quantities.
But, it is simple that to use V method casting technique be cannot to prepare to have double-walled construction and connect between double-walled and have the wheel brake of rib.
Summary of the invention
In order to solve deficiency of the prior art, production cost is low, production efficiency is high to it is an object of the invention to provide one, the wheel brake casting method that casting quality is good.
For achieving the above object, the present invention is by the following technical solutions:
A kind of wheel brake casting method, described wheel brake includes inner and outer wall, and connecting between the inner walls and the outer has multiple rib being distributed uniformly and circumferentially;Described casting method specifically includes following steps:
1) core mold is placed on core shooter carries out matched moulds, carry out penetrating sand for raw material with precoated sand, prepare core, the cylindrical side wall that described core is protruding has multiple being distributed uniformly and circumferentially and for preparing the through hole of wheel brake rib;
2) use V method casting technique to prepare lower sand mold and upper sand mold, described upper sand mold has pouring and riser systems;
3) prepared core is placed on lower sand mold, again upper sand mold is fastened on lower sand mold and carries out mould assembling, form complete casting mold, form the die cavity for casting wheel brake inwall between wherein said core and lower sand mold, between described core and upper sand mold, form the die cavity for casting wheel brake outer wall;
4) cast after mould assembling;
5) after cooling, unpacking knockout obtains foundry goods;
6) again foundry goods is cleared up, remove cast overlap, burr, obtain wheel brake finished product.
Step 2) in, the method using V method casting technique to prepare lower sand mold is:
1) by the baking covered rearing with plastic film in mecystasis on lower bolster, vacuum pump is bled and is made plastic sheeting be close on lower bolster;
2) to Plastic film surface Cast-in-place hardfacing coating, and dry;
3) drag box with filtering suction pipe is placed on the lower bolster having covered plastic sheeting;
4) do not contain the drystone sand of binding agent toward filling in drag box, vibrations make drystone sand consolidation, strike off dry quartz sand surface, put sealing film, then by filtering suction pipe, drag box is carried out evacuation so that drag box is internally formed negative pressure;
5) release the vacuum in lower bolster, then top case molding, prepare lower sand mold.
Step 2) in, the method using V method casting technique to prepare sand mold is:
1) by the baking covered rearing with plastic film in mecystasis on cope match-plate pattern, vacuum pump is bled and is made plastic sheeting be close on cope match-plate pattern;
2) to Plastic film surface Cast-in-place hardfacing coating, and dry;
3) cope with filtering suction pipe is placed on the cope match-plate pattern having covered plastic sheeting;
4) do not contain the drystone sand of binding agent toward filling in cope, vibrations make drystone sand consolidation, offer pouring and riser systems, strike off dry quartz sand surface, put sealing film, then by filtering suction pipe, cope is carried out evacuation so that cope is internally formed negative pressure;
5) release the vacuum in cope match-plate pattern, then top case molding, prepare upper sand mold.
The present invention uses above technical scheme, has following technical effect that
1, by combine V method casting technique obtain there is good strength and the upper sand mold of the degree of packing and lower sand mold.
2, by combining precoated sand casting technique acquisition core, technique is simple and convenient, and prepares core and have enough strength and stiffness.
The present invention uses V method casting technique and precoated sand casting technique to combine to solve the difficult problem that preparation structure is complicated, have the wheel brake connected between inside and outside double-walled, its double-walled by rib, and prepared wheel brake is clear-cut, any surface finish, size is accurate.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details:
Fig. 1 is the structural representation of present invention wheel brake to be cast;
Fig. 2 is the structural representation of core;
Fig. 3 is the structural representation of lower sand mold;
Fig. 4 is the structural representation of upper sand mold;
Fig. 5 is the structural representation forming block mold after mould assembling.
Detailed description of the invention
As shown in one of Fig. 1 to 5, one wheel brake casting method of the present invention, described wheel brake 1 includes inwall 12 and outer wall 11, and connecting between inwall 12 and outer wall 11 has multiple rib 13 being distributed uniformly and circumferentially;Described casting method specifically includes following steps:
1) core 2 mould is placed on core shooter carries out matched moulds, carry out penetrating sand for raw material with precoated sand, prepare core 2, the cylindrical side wall of described core 2 projection has multiple being distributed uniformly and circumferentially and for preparing the through hole 21 of wheel brake 1 rib 13;
2) use V method casting technique to prepare lower sand mold 3 and upper sand mold 4, described upper sand mold 4 has pouring and riser systems;
3) prepared core 2 is placed on lower sand mold 3, again upper sand mold 4 is fastened on lower sand mold 3 and carries out mould assembling, form complete casting mold, form the die cavity for casting wheel brake 1 inwall 12 between wherein said core 2 and lower sand mold 3, between described core 2 and upper sand mold 4, form the die cavity for casting wheel brake 1 outer wall 11;
4) cast after mould assembling;
5) after cooling, unpacking knockout obtains foundry goods;
6) again foundry goods is cleared up, remove cast overlap, burr, obtain wheel brake 1 finished product.
Step 2) in, the method using V method casting technique to prepare lower sand mold 3 is:
1) by the baking covered rearing with plastic film in mecystasis on lower bolster, vacuum pump is bled and is made plastic sheeting be close on lower bolster, and described lower bolster is hollow, and lower bolster surface has multiple passage;
2) to Plastic film surface Cast-in-place hardfacing coating, and dry;
3) drag box with filtering suction pipe is placed on the lower bolster having covered plastic sheeting;
4) do not contain the drystone sand of binding agent toward filling in drag box, vibrations make drystone sand consolidation, strike off dry quartz sand surface, put sealing film, then by filtering suction pipe, drag box is carried out evacuation so that drag box is internally formed negative pressure;
5) release the vacuum in lower bolster, then top case molding, prepare lower sand mold 3.
Step 2) in, the method using V method casting technique to prepare sand mold 4 is:
1) by the baking covered rearing with plastic film in mecystasis on cope match-plate pattern, vacuum pump is bled and is made plastic sheeting be close on cope match-plate pattern, and described cope match-plate pattern is hollow, and cope match-plate pattern surface has multiple passage;
2) to Plastic film surface Cast-in-place hardfacing coating, and dry;
3) cope with filtering suction pipe is placed on the cope match-plate pattern having covered plastic sheeting;
4) do not contain the drystone sand of binding agent toward filling in cope, vibrations make drystone sand consolidation, offer pouring and riser systems, strike off dry quartz sand surface, put sealing film, then by filtering suction pipe, cope is carried out evacuation so that cope is internally formed negative pressure;
5) release the vacuum in cope match-plate pattern, then top case molding, prepare upper sand mold 4.