CN114769508A - A mold for brake drum casting - Google Patents

Abstract

The invention relates to a section die for casting a brake drum, which comprises a first brake drum die, a first riser die, a first cross gate die and a sprue cup die, wherein the first brake drum die is matched with the shape of a brake drum to be cast, the first brake drum die is connected with the first riser die, the first riser die is connected with the sprue cup die through the first cross gate die, a second riser die is arranged above the first brake drum die and close to the center, the second riser die is connected with the first brake drum die through a first drainage channel die, and the first drainage channel die is positioned on one side of the second riser die, which is far away from an inner gate. The casting mould for casting the brake drum can greatly improve the casting quality of the brake drum, reduce the rejection rate of the casting of the brake drum, improve the use safety of the brake drum, prolong the service life of the brake drum and reduce the manufacturing cost of enterprises.

Description

A mold for brake drum casting

technical field

The invention relates to a mold for casting a brake drum, which belongs to the technical field of casting.

Background technique

The brake drum is the friction element of the drum brake. The brake drum is one of the important parts in the automobile braking system. The quality of the brake drum is related to the driving safety. The brake drum produced by integral casting has the advantages of simple structure, convenient processing and large heat capacity, and is mostly used in medium and heavy vehicles.

Casting defects such as subcutaneous pores and slag holes are easily formed on the upper surface of the brake drum cast by the conventional casting process. Subcutaneous pores are common casting defects. The pores belong to the precipitation type pores. When the molten metal solidifies, the solubility of the gas (O/N/H, etc.) in it decreases, and when the conditions for the nucleation and growth of bubbles are met, the pores are precipitated. This type of defect is often found on the upper surface of the casting or where the temperature of the molten iron is the lowest, and is formed by the rapid cooling of the molten metal after the gas is released. Therefore, the scrap rate of the brake disc can reach about 30%, which seriously affects the production cost of the enterprise.

Aiming at the deficiencies of the prior art, the present invention provides a mold for casting a brake drum, which can improve the casting yield of the brake drum by improving the casting mold.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new technical solution to improve or solve the above-mentioned technical problems in the prior art.

The present invention provides a mold for brake drum casting, which includes a first brake drum mold, a first riser mold, a first runner mold and a sprue cup mold. The shape of the casted brake drum is adapted, the first brake drum mold and the first riser mold are connected through the fifth drainage channel mold, and the first riser mold is connected with the first runner mold through the first runner mold. The sprue cup mold is connected, and the top of the first brake drum mold is provided with a second riser mold near the center, and the second riser mold is connected to the first brake drum through the first drainage channel mold. The mold is connected, and the first drainage channel mold is located on the side of the second riser mold away from the fifth drainage channel mold.

The beneficial effects of the present invention are:

1) when using the sand box produced by the brake drum casting mold of the present invention to cast the brake drum, the first step of molten iron can be drained into the first riser cavity, because the oxidation of the molten iron in the first step is the most serious, And the molten iron in the first step passes through all the positions of the cavity, which is the dirtiest. The most dirty molten iron in the first step is drawn from the first riser cavity, which can reduce the slag on the surface of the brake drum, etc.; After the molten iron is drained into the first riser cavity, it can increase the hot spots around the first riser cavity, slow down the cooling speed of the molten iron around the brake drum cavity, help bubbles to emerge, and reduce the friction on the upper surface of the brake drum. The occurrence of subcutaneous air hole defects; the use of the brake drum casting mold of the present invention can greatly improve the casting quality of the brake drum, reduce the rejection rate of the brake drum casting, improve the use safety of the brake drum, and increase the use of the brake drum. life, reduce the manufacturing cost of enterprises;

2) The first drainage channel die is located on the side of the second riser die away from the fifth drainage channel die. Since the molten iron has the inertia of forward drainage, in the sand box, the molten iron surrounds and brakes. The position where the drum cavity finally flows after it rises, so it can achieve maximum drainage.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, it also includes a second brake drum mold, the second brake drum mold is adapted to the shape of the brake drum to be cast, and the first brake drum mold and the second brake drum mold are respectively set On both sides of the first riser die, the second brake drum die is connected with the first riser die through a sixth drain channel die, and the upper part of the second brake drum die near the center is provided with The third riser die, the third riser die is connected to the second brake drum die through the second drain channel die, and the second drain channel die is located in the third riser die away from the sixth One side of the drain mold.

The beneficial effect of adopting the above-mentioned further scheme is that two brake drums can be quickly poured at one time, which greatly improves the production efficiency of the brake drums.

Further, it also includes a mold bottom plate, and the first brake drum mold, the second brake drum mold, the first riser mold, the first runner mold and the sprue cup mold are all embedded on the mold bottom plate, And the first brake drum mold and the second brake drum mold both extend downward to the bottom of the mold bottom plate.

The beneficial effect of adopting the above-mentioned further scheme is that the mold for brake drum casting of the present invention is embedded on the mold base, and the mold is fixed by the mold base, so that the shape of the mold can be maintained and the structural strength of the mold can be increased. .

Further, the position where the first drain channel mold is connected with the first brake drum mold is provided with a cut-off groove, and the position where the second drain channel mold is connected with the second brake drum mold is also provided with a cut-off groove. groove.

The beneficial effect of adopting the above-mentioned further solution is to reduce the difficulty of separating the casted brake drum and the riser.

Further, a sprue mold is further provided below the sprue cup mold, and the sprue mold is connected with the first runner mold.

Further, the first runner mold includes an upper lap block, a lower lap block and a sprue sprue mold, the upper lap block is arranged on the upper part of the mold base plate, and the lower lap block is provided. The sprue and sprue molds are arranged at the lower part of the mold base plate, the lower lap block, the upper lap block and the sprue cavity mold are staggered above and below the mold base plate, and the sprue The sprue mold is located below the sprue.

The beneficial effect of adopting the above-mentioned further scheme is that a filter screen can be arranged between the cavity of the lower lap block and the cavity of the upper lap block, and the molten iron first flows into the cavity of the sprue through the cavity of the sprue cup , and then flow upwards into the cavity of the upper lap block. The molten iron in the cavity of the upper lap block is filtered by the filter screen and then flows downward into the cavity of the lower lap block, and finally flows into the brake through the first riser cavity. Therefore, the lower overlapping block, the upper overlapping block and the upper and lower overlapping structure of the sprue sprue mold can form the installation position of the filter screen in the sand box.

Further, a second runner die and a third runner die are respectively connected on both sides of the first riser die, and the second runner die and the first brake drum die pass through the third runner die. The drain channel mold is connected, and the third runner mold and the second brake drum mold are connected through a fourth drain channel mold.

The beneficial effect of adopting the above-mentioned further scheme is that the second runner mold and the third runner mold can increase the pouring channel in the sand box, which is beneficial to the sequential solidification of the castings, and further reduces the shrinkage, pores and other defects of the product pipe parts. .

Further, a first riser base die is also provided below the die base plate, the first riser base die and the first riser base die are coaxially arranged, and the first riser base die is overlapped with the lower part. Block connection.

Description of drawings

Fig. 1 is the top view of the brake drum casting mould of the present invention;

Fig. 2 is A-A sectional view of the present invention;

Fig. 3 is the top view that the brake drum casting mould of the present invention is installed on the mould base plate;

Figure 4 is a partial cross-sectional view of a flask produced using the mold of the present invention;

In the figure, 1, the first brake drum mold; 2, the first riser mold; 3, the first runner mold; 4, the gate cup mold; 5, the second riser mold; 6, the first drainage channel 7. The second brake drum die; 8. The third riser die; 9. The second drainage channel die; 10. The die bottom plate; 11. The cutting groove; ; 14, the lower lap block; 15, the sprue mold; 16, the first riser base mold; 17, the second runner mold; 18, the third runner mold; 19, the third drain mold ; 20, the fourth drainage channel mold; 21, the upper sand box; 22, the lower sand box; 23, the sprue cup cavity; 24, the sprue cavity; 25, the sprue cavity; 26, the upper Lap block cavity; 27, filter screen; 28, lower lap block cavity; 29, first riser seat cavity; 30, first riser cavity; 31, second brake drum cavity; 32, The third riser cavity; 33, the gate; 34, the fifth drainage channel mold; 35, the sixth drainage channel mold.

Detailed ways

The principles and features of the present invention will be described below with reference to examples. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

As shown in FIG. 1-FIG. 3, a mold for brake drum casting includes a mold base 10, and also includes a first brake drum mold 1, a first riser mold 2, a first brake drum mold 1, a first riser mold 2, The first runner mold 3 and the sprue cup mold 4, the first brake drum mold 1 is adapted to the shape of the brake drum to be cast, and the first brake drum mold 1 is compatible with the first brake drum mold 1. The riser die 2 is connected through the fifth drainage channel die 34 , the first riser die 2 is connected with the sprue cup die 4 through the first runner die 3 , and the upper part of the first brake drum die 1 is There is a second riser die 5 near the center, and the second riser die 5 is connected to the first brake drum die 1 through a first drain duct die 6, and the first drain duct die 6 is located in the The second riser die 5 is away from the side of the fifth channel die 34 . In the flask, the fifth drainage channel mold 34 forms the ingate 33 of the first brake drum mold 1, and the ingate 33 is the entrance for molten iron to flow into the cavity of the first brake drum, that is, in the pouring process During the process, the drainage channels from the first brake drum mold 1 to the second riser mold 5 are kept away from the inner runner 33 of the first brake drum mold 1 .

When casting the brake drum by using the sand box produced by the mold for casting the brake drum of the present invention, the molten iron in the first step can be drained into the first riser cavity 30 to reduce slag holes on the surface of the brake drum, etc.; , after the molten iron is drained into the first riser cavity 30, the hot spots around the first riser cavity 30 can be increased, the cooling speed of the molten iron around the brake drum cavity can be slowed down, which is conducive to the emergence of bubbles and reduces braking Creation of subcutaneous stomatal defects on the upper surface of the drum.

Additionally, in specific embodiments,

The brake drum casting mold also includes a second brake drum mold 7, which can quickly cast two brake drums at one time, greatly improving the production efficiency of the brake drums. The second brake drum mold 7 is adapted to the shape of the brake drum to be cast, and the first brake drum mold 1 and the second brake drum mold 7 are respectively arranged on the first riser mold 2. On both sides, the second brake drum mold 7 is connected with the first riser mold 2 through the sixth drainage channel mold 35, and a third riser is provided above the second brake drum mold 7 near the center Die 8, the third riser die 8 is connected with the second brake drum die 7 through the second drain channel die 9, and the second drain channel die 9 is located in the third riser die 8 away from the One side of the sixth drainage channel mold 35 . In the flask, the sixth drainage channel mold 35 forms the ingate 33 of the second brake drum mold 7, and the ingate 33 is the entrance for molten iron to flow into the cavity of the second brake drum, that is, during pouring During the process, the drainage channels from the second brake drum mold 7 to the third riser mold 8 are kept away from the inner runner 33 of the second brake drum mold 7 .

The position where the first drain channel mold 6 is connected with the first brake drum mold is provided with a cut-off groove 11, and the position where the second drain channel mold 9 is connected with the second brake drum mold is also provided with a cut-off slot 11. Slot 11. The design of the cutting groove 11 can reduce the difficulty of separation between the casted brake drum and the riser.

The first brake drum mold 1 , the second brake drum mold 7 , the first riser mold 2 , the first runner mold 3 and the sprue cup mold 4 are all embedded on the mold base plate 10 . A brake drum casting mold is embedded on the mold base plate 10, and the mold base plate 10 is used to fix the mold mold, so that the shape of the mold mold can be maintained, and the structural strength of the mold mold can be increased, and the first brake drum mold Both the 1 and the second brake drum moulds 7 extend downwardly below the mould base plate 10 . The first runner mold 3 includes an upper lap block 13, a lower lap block 14 and a sprue sprue mold 15. The upper lap block 13 is arranged on the upper part of the mold base plate 10, and the lower The lap block 14 and the sprue cavity mold 15 are arranged at the lower part of the mold base plate 10 , and the lower lap block 14 , the upper lap block 13 and the sprue cavity mold 15 are above and below the mold base plate 10 . The bottom is staggered to form the installation position of the filter screen 27 in the sand box. There is also a sprue mold 12 below the sprue cup mold 4. below. A first riser base die 16 is further provided below the die base plate 10 , the first riser base die 16 is coaxially arranged with the first riser die 2 , and the first riser base die 16 The lower lap block 14 is connected.

A second runner die 17 and a third runner die 18 are respectively connected on both sides of the first riser die 2 , and the second runner die 17 passes through the first brake drum die 1 . The third runner die 19 is connected, and the third runner die 18 is connected with the second brake drum die 7 through the fourth runner die 20 . The second runner mold 17 and the third runner mold 18 can increase the pouring channel in the flask, which is beneficial to the sequential solidification of castings, and further reduces defects such as shrinkage and pores in the product pipe parts. In addition, a cut-off groove 11 can be set at the position where the third drain channel mold 19 is connected with the first brake drum mold 1, and a cut-off groove can also be set at the position where the fourth drain channel mold 20 is connected with the second brake drum mold 7. Slot 11.

The method for casting brake drum using the brake drum casting mold of the present invention is as follows:

First, use the brake drum casting mold of the present invention to manufacture a flask, the size of the flask is selected to be smaller than the size of the die base 10, and the upper flask 21 and the lower flask 22 are buckled above and below the die base 10 respectively. , and then shoot sand in the upper sand box 21 and the lower sand box 22 respectively. After opening the box, the mold for casting the brake drum is taken out, and the mold for casting the brake drum is formed in the upper and lower sand boxes 22. suitable cavity.

4 is a partial cross-sectional view of the flask, after the upper flask 21 and the lower flask 22 are fastened together, the brake drum casting cavity between the upper flask 21 and the lower flask 22 includes: The first brake drum cavity, the second brake drum cavity 31, the first riser cavity 30, the second riser cavity, the third riser cavity 32, the first riser seat cavity 29, the gate Cup cavity 23, sprue cavity 24, upper lap block cavity 26, lower lap block cavity 28 and sprue cavity 25, and the upper lap block cavity 26 and the lower lap joint A filter screen 27 is arranged between the block cavities 28 . The fifth diversion channel mold 34 forms the gate 33 of the first brake drum mold 1, and the gate 33 of the first brake drum mold 1 is for molten iron to flow into the cavity of the first brake drum. At the entrance, the sixth drainage channel mold 35 forms the inner gate 33 of the second brake drum mold 7, and the inner gate 33 of the second brake drum mold 7 is for molten iron to flow into the second brake drum mold The entrance to cavity 31.

When casting with the above-mentioned flask, molten iron is injected from the sprue cup cavity 23, and in the first step, molten iron flows through the sprue cavity 24, the sprue cavity 25, and the upper lap block cavity 26 in turn. , filter screen 27, lower lap block cavity 28, first riser seat cavity 29, first riser cavity 30, first brake drum cavity and second brake drum cavity 31 from the The second riser cavity and the third riser cavity 32 lead out the dirtiest molten iron in the first step, and the drainage port of the second riser cavity is located on the side away from the ingate 33 of the first brake drum cavity , Because the molten iron has the inertia of forward drainage, here is the position where the molten iron flows last after rising around the brake drum cavity, which can realize the maximum drainage of the molten iron in the first brake drum cavity; the third riser type The drainage port of the cavity 32 is arranged on the side away from the inner gate 33 of the second brake drum cavity 31 , which can realize the maximum drainage of molten iron in the second brake drum cavity 31 .

The use of the brake drum casting mold of the present invention can greatly improve the casting quality of the brake drum, reduce the scrap rate of the brake drum casting, improve the use safety of the brake drum, increase the service life of the brake drum, and reduce the production of the enterprise. cost.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still understand the foregoing embodiments. The technical solutions described are modified, or some technical features thereof are equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. A section mould for casting a brake drum comprises a first brake drum mould (1), a first riser mould (2), a first cross gate mould (3) and a sprue cup mould (4), the first brake drum mould (1) is matched with the shape of a brake drum to be cast, the first brake drum mould (1) is connected with the first belling mould (2) through a fifth drainage channel mould (34), the first belling die (2) is connected with the sprue cup die (4) through a first cross gate die (3), it is characterized in that a second belling die (5) is arranged above the first brake drum die (1) and close to the center, the second belling die (5) is connected with the first brake drum die (1) through a first drainage channel die (6), the first drainage channel die (6) is positioned on one side, far away from the fifth drainage channel die (34), of the second belling die (5).

2. The forming die for casting the brake drum as claimed in claim 1, further comprising a second brake drum die (7), wherein the second brake drum die (7) is matched with the shape of the brake drum to be cast, the first brake drum die (1) and the second brake drum die (7) are respectively arranged on two sides of the first belling die (2), the second brake drum die (7) is connected with the first belling die (2) through a sixth drainage channel die (35), a third belling die (8) is arranged above the second brake drum die (7) and close to the center, the third belling die (8) is connected with the second brake drum die (7) through a second drainage channel die (9), and the second drainage channel die (9) is positioned on one side of the third belling die (8) far away from the sixth drainage channel die (35).

3. The pattern die for casting a brake drum as claimed in claim 2, further comprising a die base plate (10), wherein the first brake drum die (1), the second brake drum die (7), the first riser die (2), the first runner die (3) and the sprue cup die (4) are all embedded on the die base plate (10), and the first brake drum die (1) and the second brake drum die (7) both extend downward below the die base plate (10).

4. The pattern die for casting the brake drum according to claim 2, wherein a cutting groove (11) is formed at a position where the first drainage channel die (6) is connected with the first brake drum die (1), and a cutting groove (11) is formed at a position where the second drainage channel die (9) is connected with the second brake drum die (7).

5. The pattern die for casting the brake drum according to any one of claims 1 to 4, wherein a sprue die (12) is further provided below the sprue cup die (4), and the sprue die (12) is connected to the first runner die (3).

6. The pattern die for brake drum casting according to claim 3, wherein the first runner die (3) includes an upper lap block, a lower lap block, and a sprue pocket die (15), the upper lap block is provided at an upper portion of the die base plate (10), the lower lap block and the sprue pocket die (15) are provided at a lower portion of the die base plate (10), the lower lap block, the upper lap block, and the sprue pocket die (15) are alternately provided above and below the die base plate (10), and the sprue pocket die (15) is located below the sprue die (12).

7. A pattern die for brake drum casting according to claim 2 or 3, characterized in that a second cross gate die (17) and a third cross gate die (18) are connected to both sides of the first riser die (2), respectively, the second cross gate die (17) being connected to the first brake drum die (1) by a third drainage duct die (19), and the third cross gate die (18) being connected to the second brake drum die (7) by a fourth drainage duct die (20).

8. The pattern die for casting a brake drum according to claim 6, wherein a first riser seat die (16) is further provided below the die base plate (10), the first riser seat die (16) is coaxially provided with the first riser die (2), and the first riser seat die (16) is connected to the lower overlapping block (14).

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