CN104668460A - Casting method of wheel brake - Google Patents

Abstract

The invention discloses a casting method of a wheel brake. The method specifically comprises the following steps: (1) clamping a sand core mold on a core shooting machine, carrying out sand blowing employing precoated sand as a raw material, preparing a sand core, wherein a plurality of through holes which are evenly distributed along the peripheral direction and are used for preparing a wheel brake rib are formed in the convex cylindrical lateral wall of the sand core; (2) preparing an upper sand mold and a lower sand mold by a V-method casting process, and a gating and rising system is arranged on the upper sand mold; (3) putting the prepared sand core on the lower sand mold, clamping the upper sand mold on the lower sand mold to form an intact cast; (4) casting after clamping; (5) cooling, unpacking and knocking out to obtain the cast; and (6) cleaning the cast, removing poured flashes and burrs to prepare a wheel brake product. By combining the V-method casting process with the precoated sand casting process, the problems in preparation of the wheel brake, which is complicated in structure and includes inner and outer walls, and of which the walls are connected with each other through the rib are solved.

Description

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

Present stage automobile brake drum blank manufacture method be mainly V method casting, the casting of V method utilizes 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, vacuumize make casting solidification through lower core, mould assembling, cast, remove negative pressure, molding sand is thereupon defeated and dispersed and obtain foundry goods.This explained hereafter cast(ing) surface is out bright and clean, clear-cut, uniform in material, being different from traditional sand casting great advantage is do not use binding agent, greatly alleviate sand work for the treatment of, the amount of labour of foundry goods scab cleaning also greatly reduces, the old sand rate of recovery can reach more than 95%, is applicable to multi items single and mini-batch production and production in enormous quantities.

But simple employing V method casting technique to obtain the wheel brake having and be connected with rib between double-walled construction and double-walled.

Summary of the invention

In order to solve deficiency of the prior art, the object of the present invention is to provide that a kind of production cost is low, production efficiency is high, 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 comprises inner and outer wall, is connected with multiple along the circumferential direction equally distributed rib between the inner walls and the outer; Described casting method specifically comprises the following steps:

1) core mold being placed on core shooter and carrying out matched moulds, is that raw material carries out penetrating sand with precoated sand, obtained core, the cylindrical side wall of described core projection has multiple to be along the circumferential direction uniformly distributed and for the preparation of the through hole of wheel brake rib;

2) adopt the obtained lower sand mold of V method casting technique and upper sand mold, described upper sand mold has pouring and riser systems;

3) obtained 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, forming the die cavity for casting wheel brake inwall between wherein said core and lower sand mold, between described core and upper sand mold, forming 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 adopting V method casting technique to obtain lower sand mold is:

1) by baking in the covered rearing with plastic film of mecystasis on lower bolster, vavuum 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 has covered on the lower bolster of plastic sheeting;

4) in drag box, fill the drystone sand not containing binding agent, vibrations make drystone sand consolidation, strike off dry quartz sand surface, put sealing film, then vacuumized drag box by filtering suction pipe, make drag box inside form negative pressure;

5) remove the vacuum in lower bolster, then push up case molding, obtained lower sand mold.

Step 2) in, the method adopting V method casting technique to obtain sand mold is:

1) by baking in the covered rearing with plastic film of mecystasis on cope match-plate pattern, vavuum 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 has covered on the cope match-plate pattern of plastic sheeting;

4) in cope, fill the drystone sand not containing binding agent, 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 vacuumized, make drag box inside form negative pressure;

5) remove the vacuum in cope match-plate pattern, then push up case molding, obtained upper sand mold.

The present invention adopts above technical scheme, has following technique effect:

1, by obtaining in conjunction with V method casting technique, there is the upper sand mold of good strength and the degree of packing and lower sand mold.

2, by obtaining core in conjunction with precoated sand fabrication technique, technique is simple and convenient, and obtained core has enough strength and stiffness.

The present invention adopts V method casting technique to combine to solve a difficult problem for the wheel brake prepared complex structure, have inside and outside double-walled, be connected by rib between its double-walled with precoated sand fabrication technique, and obtained wheel brake 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 the present invention's 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, a kind of wheel brake casting method of the present invention, described wheel brake 1 comprises inwall 12 and outer wall 11, is connected with multiple along the circumferential direction equally distributed rib 13 between inwall 12 and outer wall 11; Described casting method specifically comprises the following steps:

1) being placed on core shooter by core 2 mould and carrying out matched moulds, is that raw material carries out penetrating sand with precoated sand, obtained core 2, the cylindrical side wall of described core 2 projection has multiple to be along the circumferential direction uniformly distributed and for the preparation of the through hole 21 of wheel brake 1 rib 13;

2) adopt the obtained lower sand mold 3 of V method casting technique and upper sand mold 4, described upper sand mold 4 has pouring and riser systems;

3) obtained 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, forming 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, forming 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 adopting V method casting technique to obtain lower sand mold 3 is:

1) by baking in the covered rearing with plastic film of mecystasis on lower bolster, vavuum 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 has covered on the lower bolster of plastic sheeting;

4) in drag box, fill the drystone sand not containing binding agent, vibrations make drystone sand consolidation, strike off dry quartz sand surface, put sealing film, then vacuumized drag box by filtering suction pipe, make drag box inside form negative pressure;

5) remove the vacuum in lower bolster, then push up case molding, obtained lower sand mold 3.

Step 2) in, the method adopting V method casting technique to obtain sand mold 4 is:

1) by baking in the covered rearing with plastic film of mecystasis on cope match-plate pattern, vavuum 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 has covered on the cope match-plate pattern of plastic sheeting;

4) in cope, fill the drystone sand not containing binding agent, 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 vacuumized, make drag box inside form negative pressure;

5) remove the vacuum in cope match-plate pattern, then push up case molding, obtained upper sand mold 4.

Claims (3)

1. a wheel brake casting method, described wheel brake comprises inner and outer wall, is connected with multiple along the circumferential direction equally distributed rib between the inner walls and the outer; It is characterized in that: described casting method specifically comprises the following steps:

1) core mold being placed on core shooter and carrying out matched moulds, is that raw material carries out penetrating sand with precoated sand, obtained core, the cylindrical side wall of described core projection has multiple to be along the circumferential direction uniformly distributed and for the preparation of the through hole of wheel brake rib;

2) adopt the obtained lower sand mold of V method casting technique and upper sand mold, described upper sand mold has pouring and riser systems;

3) obtained 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, forming the die cavity for casting wheel brake inwall between wherein said core and lower sand mold, between described core and upper sand mold, forming 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.

2. a kind of wheel brake casting method according to claim 1, is characterized in that: step 2) in, the method adopting V method casting technique to obtain lower sand mold is:

1) by baking in the covered rearing with plastic film of mecystasis on lower bolster, vavuum 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 has covered on the lower bolster of plastic sheeting;

4) in drag box, fill the drystone sand not containing binding agent, vibrations make drystone sand consolidation, strike off dry quartz sand surface, put sealing film, then vacuumized drag box by filtering suction pipe, make drag box inside form negative pressure;

5) remove the vacuum in lower bolster, then push up case molding, obtained lower sand mold.

3. a kind of wheel brake casting method according to claim 1, is characterized in that: step 2) in, the method adopting V method casting technique to obtain sand mold is:

1) by baking in the covered rearing with plastic film of mecystasis on cope match-plate pattern, vavuum 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 has covered on the cope match-plate pattern of plastic sheeting;

4) in cope, fill the drystone sand not containing binding agent, 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 vacuumized, make drag box inside form negative pressure;

5) remove the vacuum in cope match-plate pattern, then push up case molding, obtained upper sand mold.