CN218487167U - Front axle main reducer casing casting mould - Google Patents

Abstract

A front axle main reducer shell casting mould comprises a mould body consisting of an upper mould and a lower mould, a cylindrical side core which is arranged on the mould body and used for forming two bearing holes, and a sand core which is arranged in the mould body and used for forming the inner wall of a front axle main reducer shell; the lower die is provided with a movable module used for forming the suspension arm, the movable module comprises a side pulling block and a movable block I, the movable block I is arranged opposite to the side pulling block, and the lower die is further provided with a movable block II used for demoulding the abdicating suspension arm. The utility model discloses a reasonable mould design has avoided welding suspension arm for front axle main reducer casing foundry goods formula structure as an organic whole.

Description

Front axle main reducer casing casting mould

Technical Field

The utility model belongs to the casting field, concretely relates to front axle main reducer casing casting mould.

Background

The final drive housing is one of the important parts of the drive axle. The main reducer shell is assembled on a front axle of the automobile.

The front axle main reducer casing is a large thin-wall casting (as shown in figures 3 and 4), the front end of the front axle main reducer casing is provided with a front end pipe orifice A, the rear part of the front axle main reducer casing is provided with two symmetrical bearing holes B, the front axle main reducer casing close to one bearing hole is provided with a suspension arm C protruding outwards, the end part of the suspension arm is provided with a suspension hole, the front side and the rear side of the suspension arm are provided with concave structures C1, and the structure is complex. Because the suspension arm structure, position are special, at present, front axle final drive casing adopts split type foundry goods, and the suspension arm welds with the major structure of front axle final drive casing after casting alone.

The processing steps are multiple, and the quality of the welding at the welding position also influences the quality of the product.

Disclosure of Invention

The utility model aims at overcoming the above-mentioned not enough of prior art, and provide a front axle main reducer casing casting mould, do not adopt welding process, through the front axle main reducer casing of mould shaping integral type structure, guarantee the stability of product quality.

The technical scheme of the utility model is that:

a front axle main reducer shell casting mould comprises a mould body consisting of an upper mould and a lower mould, a cylindrical side loose core which is arranged on the mould body and used for forming two bearing holes, and a sand core which is arranged in the mould body and used for forming the inner wall of a front axle main reducer shell; the lower die is provided with a movable module used for forming the suspension arm, the movable module comprises a side pulling block and a movable block I, the movable block I is arranged opposite to the side pulling block, and the lower die is further provided with a movable block II used for demoulding the abdicating suspension arm.

The side surface of the lower die is provided with a block pulling hole matched with the side block pulling, the movable block II is arranged above the suspension arm C, and the lower die is provided with a mounting concave part matched with the movable block II.

The outer end of the side pulling block is connected with a shocking hammer through a supporting rod.

The outer shape of the front end of the side pulling block is provided with a forming surface for forming the concave structure on the rear side surface of the suspension arm, and the second movable block is provided with a forming surface for forming the concave structure on the front side surface of the suspension arm.

The surface of the sand core at the position corresponding to the boss side wall D of the inner end face of one bearing hole is provided with a first chiller, the surface of the sand core at the position corresponding to the boss side wall of the inner end face of the other bearing hole is provided with a fourth chiller, and the surface of the sand core at the position corresponding to the inner wall E of the front-end pipe opening is provided with a third chiller and a second chiller. And the second chilling block and the third chilling block are buckled into a semicircle and are bonded on the sand core, and the thick and large part of the pipe wall of the inner cavity of the casting is cooled quickly in the solidification process due to the chilling action of the chilling blocks, so that the internal tissue density of the part is ensured. The other two chilling blocks are placed on the surfaces of the sand cores of the bearing holes on the two sides, and similarly, the chilling blocks play a role in accelerating the solidification of the molten aluminum at the position, so that the quality problems of looseness, shrinkage cavity and the like do not occur at the position.

The mould also comprises a material ejecting mechanism; the ejection mechanism comprises an ejection plate, an ejection fixing plate and an ejection rod, the ejection fixing plate is connected with the ejection plate, the reset rod and the ejection rod are both fixedly installed between the ejection plate and the ejection fixing plate, and the ejection plate and the ejection fixing plate press the ends of the reset rod and the ejection rod so as not to enable the ends of the reset rod and the ejection rod to move back and forth; the length of liftout rod and the surperficial parallel and level of different shapes in the mould die cavity, the length of each liftout rod is inconsistent, the die joint parallel and level of terminal surface and mould before each release link, and each release link length is the same.

The mould also comprises a pouring system and an exhaust rod; the pouring system comprises a pouring cup, a pouring gate and a riser, wherein the pouring cup is arranged on the side surface of the position die and is arranged on the lower die, the pouring gate is subsidized and arranged on the top surface of the pouring gate part of the upper die, the front side surface of the pouring gate is tightly attached to the inclined plane part of the pouring cup, and the riser corresponds to the front end pipe orifice part of the main speed reducer shell and the bearing hole parts on the two sides of the main speed reducer shell.

The utility model discloses a reasonable mould design has avoided welding suspension arm for front axle main reducer casing foundry goods formula structure as an organic whole.

The inventor finds that the three openings of the main speed reducer shell are thicker than other parts of the shell due to the wall thickness, the structure density of the thick wall part is not enough in the solidification process of the main speed reducer shell casting, shrinkage porosity defects are easy to generate, and the yield is low. The utility model discloses a three mouth department at the main reducer casing foundry goods adopts the viscose core to glue bonding chiller on the psammitolite surface, and the chiller is faster than the psammitolite refrigerated, and the chiller accelerates main reducer casing foundry goods local cooling rate, improves main reducer casing foundry goods density to reduce the shrinkage porosity defect of product.

Drawings

Fig. 1 is a schematic structural view of a casting mold of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is one of the schematic structural views of the final drive housing;

FIG. 4 is a second schematic structural view of the final drive housing;

FIG. 5 is a front view of the lower die;

FIG. 6 is a bottom view of the lower die;

FIG. 7 is a side view of the lower die;

FIG. 8 is a schematic structural view of a side draw block;

FIG. 9 is a side view of FIG. 8;

FIG. 10 is a schematic structural view of a loose piece II;

FIG. 11 is a top view of activity two;

FIG. 12 is a schematic structural view of a first loose piece;

FIG. 13 is a side view of the loose piece two.

Detailed Description

The utility model discloses a front axle main reducer casing casting method, including following step:

a die assembly

As shown in fig. 1-13, the mold comprises a mold body consisting of an upper mold 3 and a lower mold 2, a sand core arranged in the mold body and used for molding the inner wall of the shell of the front axle main speed reducer, a material ejecting mechanism, a pouring system and an exhaust rod 7;

the lower die 2 is provided with a movable die set for forming the suspension arm, and the movable die set comprises a side pumping block 18, a first movable block 25 matched with the side pumping block 18 and a second movable block 26 arranged on the lower die 2 and used for demoulding the suspension arm;

a first chilling block 27 is arranged on the surface of the sand core at the position corresponding to the boss side wall D of the inner end face of one bearing hole, a fourth chilling block 30 is arranged on the surface of the sand core at the position corresponding to the boss side wall D of the inner end face of the other bearing hole, and a third chilling block 29 and a second chilling block 28 are arranged on the surface of the sand core at the position corresponding to the inner wall E of the front-end pipe orifice; and the three chiller 29 and the second chiller 28 are buckled into a semicircle and are bonded on the sand core, and the thick and large part of the pipe wall of the inner cavity of the casting is cooled quickly in the solidification process due to the chilling action of the chillers, so that the internal tissue density of the part is ensured. The other two chilling blocks are placed on the surfaces of the sand cores of the bearing holes on the two sides, and similarly, the chilling blocks play a role in accelerating the solidification of the molten aluminum at the position, so that the quality problems of looseness, shrinkage cavity and the like do not occur at the position.

The ejection mechanism comprises an ejector plate 9, an ejection fixing plate 10 connected with the ejector plate 9 and an ejection rod 15, wherein the reset rod 14 and the ejection rod 15 are fixedly arranged between the ejector plate and the ejection fixing plate together, and the ejector plate 9 and the ejection fixing plate 10 press the ends of the reset rod 14 and the ejection rod 15 so as not to move back and forth; the length of each ejector rod 15 is flush with the surfaces of different shapes in the die cavity, the length of each ejector rod 15 is different, the front end surface of each reset rod 14 is flush with the parting surface of the die, and the length of each reset rod 14 is the same; the reset rod 14 plays a role of jacking the ejector plate back; the reset rod 14 pushes back the ejector plate and the ejector fixing plate of the mold, and the front section of the ejector rod fixed on the ejector plate is flush with the height of the mold cavity.

The mould also comprises two cylindrical side loose cores 17 for forming two bearing holes; the side surface of the lower die 2 is provided with a block drawing hole matched with the side block drawing 18, and the outer end of the side block drawing 18 is connected with a shocking hammer 19 through a support rod 20; the front end of the side pulling block 18 is provided with a forming surface for forming the concave structure on the rear side surface of the suspension arm, the first movable block 25 is provided with a forming surface for forming the concave structure on the front side surface of the suspension arm, and the side pulling block 18, the second movable block 26 and the first movable block 25 are designed to enable the casting to be smoothly separated from the die cavity from the side surface. The arc-shaped surface 261 of the second loose piece 26 is matched with the cylindrical side loose core 17.

The pouring system comprises a pouring cup 1, a pouring gate and a riser, wherein the pouring cup 1 is arranged on the side surface of a position die and is installed on a lower die, a pouring gate patch 4 is used for preventing the instantaneous flow of aluminum water from being overlarge during pouring and overflowing from the top surface of an upper die, the pouring gate patch 4 is installed on the top surface of a pouring gate part of the upper die, the front side surface of the pouring gate patch is tightly attached to the inclined surface part of the pouring cup, the riser corresponds to the front-end pipe orifice part of a main reducer shell and the bearing hole parts on two sides of the main reducer shell, and a sufficient aluminum water feeding source is provided for the thick hot spot of the part. The upper die 3 is connected with an upper die connecting plate 6 through an upper die connecting rod 5. The ejection mechanism further comprises a guide assembly, the guide assembly comprises a guide rod 12 and a guide sleeve 13, the guide rod 12 is inserted into the guide sleeve, the guide sleeve is fixed in the mounting hole, an upper mounting hole is formed in the ejector plate 9, a lower mounting hole is formed in the ejection fixing plate 10, the upper mounting hole and the lower mounting hole form a safe mounting hole, and a concave portion matched with a flange portion in the middle of the guide sleeve is formed in the lower end face of the upper mounting hole. The lower end of the exhaust rod 7 is matched with an exhaust rod hole on the upper die 3, the head of the exhaust rod 7 arranged at the upper end of the ejector plate 9 is provided with a lifting hole, and the ejector plate 9 and the ejector fixing plate 10 are provided with a yielding hole matched with the exhaust rod 7.

After the upper die is fitted on the lower die, the reset rod 14 is pressed down, the front end surface of the reset rod 14 is flush with the parting surface, and the front section of the ejector rod fixed on the ejector plate is flush with the die cavity;

c, casting and molding a casting;

d, opening the upper die and the lower die, and jacking the material jacking rod 15 and the reset rod 14 when the casting is demoulded;

and E, after the casting is demoulded, repeating the steps A-D to cast the next casting.

The core making method comprises the following steps:

heating the core box, namely connecting power supply wires of electric heating tubes, switching on the power supply, and heating a die, wherein the temperature of the die is 200-240 ℃ of a static die, the temperature of a movable die is 210-250 ℃, and the temperature of the movable die is higher than that of the static die by more than 10 ℃; manually making the core for two to three times, after the action is correct and the made sand core is qualified, adopting a KW957 shell core machine to make the core semi-automatically or fully automatically, spraying a release agent on the surface of the cavity, and adjusting the sand shooting pressure, the sand shooting time and the heating time, and the sand shooting pressure: 0.4-0.6MPa, sand shooting time: 4-7S, crusting time: 1.5-2min, heating for 5-6min; filing the sand core parting batch seam with a saw blade, leveling the ejector pin mark and the concave part, and bonding the chill on the sand core with a core bonding adhesive;

the casting method comprises the following steps:

preheating the mold to make the surface reach 150-250 ℃; spraying a base material and a surface material, wherein the thickness of the base material is controlled to be 0.1mm, the thickness of the surface material layer is about 0.05-0.1mm, and a heat-insulating coating is sprayed at a casting head, and the thickness is about 1.5-2 mm; continuously preheating the mould to 250-450 ℃ to meet the pouring requirement;

pouring: scraping off the coating on the parting surface, blowing the mold clean, starting the mold opening machine, and closing the mold flat; accurately placing the sand core into a lower die cavity; scooping a proper amount of aluminum liquid, carrying out steady flow rapid continuous casting for 8-12s, and controlling the temperature of the cast aluminum liquid: self-checking at 700-720 ℃, and marking the casting with serious surface defects;

the processing steps after the casting is demoulded are as follows:

a, punching a sprue and a cross runner by using a punch;

b, removing a riser: placing the casting on a band saw, positioning the casting, starting a sawing machine, sawing off a casting head, wherein the residual height is not more than 3-5mm;

c, sand removal: removing the fash with an iron hammer, knocking the thick part and the processed surface of the casting with a hammer, and shaking off core sand and loose pieces with a shaking sand remover;

d, deburring: removing burrs, burrs and bumps on the inner and outer surfaces of the casting by using a chisel, and removing, polishing and flattening the batch seams and the bumps by using a pneumatic shovel or a polisher, wherein the parting burr height of a non-machined surface is required to be within 1mm, and the parting burr height of a machined surface is not more than 3mm;

e, heat treatment: the casting adopts T6 heat treatment, and the T6 heat treatment is divided into two stages, namely aging treatment and solid solution treatment;

f, shot blasting, namely putting the castings into a roller shot blasting machine, wherein the number of the castings is not more than 5, and the shot blasting time is 5-10 minutes; the appearance of the inner surface and the outer surface is consistent; checking whether holes exist on the inner surface and the outer surface of the product, marking the holes, and performing shoveling, welding and shot blasting; the shot blasting machine has the advantages of removing rust, removing surface oxide skin, improving surface roughness, removing machined burrs of parts, eliminating internal stress of the parts, reducing deformation of the parts after heat treatment, improving wear resistance and compression capacity of the surfaces of the parts and the like.

g, mechanical property test: the hardness is more than or equal to 80HBS, the tensile strength is more than or equal to 270Mpa, and the elongation is more than or equal to 7 percent;

h, casting inspection: checking whether the defects of air holes, cold shut and crack penetrability exist on the surface of the casting, repairing the defects of the machined surface to be repaired, wherein the diameter of the non-machined surface is less than 2mm and the defects are allowed to remain; the depth of the convex or concave part of the parting trace on the non-processing surface of the casting is not more than 1mm.

The aluminum alloy smelting steps are as follows:

(1) and (4) charging. And (3) loading a prefabricated alloy ingot and high-quality foundry returns into the preheated crucible, adding fol alloy, and then adding alloy elements.

(2) And (4) controlling the temperature. The temperature for smelting the aluminum alloy is strictly controlled, and high-quality alloy liquid can be obtained only at proper temperature, so that overheating is avoided. If the temperature is too high, the oxidation and burning loss of various elements in the alloy are increased, and the change of chemical components in the alloy is caused. If the temperature is too low, the chemical components of the alloy are not uniform, oxide inclusions, gas and the like in the alloy are not easy to discharge, the physical and chemical properties of the alloy are reduced, and the casting performance is influenced.

(3) And (5) controlling time. The smelting time is strictly controlled, the operation is rapid, the air suction and the oxide inclusion of the alloy are reduced, the burning loss of alloy elements is increased, and the chemical composition of the alloy is influenced.

(4) And (5) refining operation. The aluminum alloy refining aims at removing gas and non-metallic inclusions in molten liquid and homogenizing alloy components. Refining is a process of paramount importance in smelting. The refining agent is correctly selected, the addition amount is controlled to be 0.5 to 0.7 percent of the alloy mass, the refining temperature is controlled to be 700 to 7200 ℃. In the refining process, a bell jar is used for pressing the refining agent into 2/3 of the position below the molten liquid level in batches, the refining agent uniformly and slowly rotates clockwise, the speed is slow, the action is stable, and the molten metal is prevented from being greatly stirred so as to prevent the increase of hydrogen content and the inclusion.

(5) And (5) performing modification treatment.

The purpose of alloy deterioration is to refine grains and improve the performance of castings. The alterant is preheated firstly, and the key points of the control are as follows: (1) the deterioration temperature is generally not more than 7400C; (2) the deterioration time is generally 10 min; (3) the addition amount of the modifier is 1.0-1.2% of the weight of the alloy liquid by using the two-color modifier; (4) the operation method is in place. After the alloy is refined, pouring is finished as soon as possible, sand casting is generally controlled within 40min, metal mold casting is controlled within 2h, otherwise, refining and deterioration are carried out again, and the refining agent added during refining again is about 0.2% of the mass of the alloy.

The specific method for charging and smelting into casting aluminum liquid comprises the following steps:

smashing the returned materials into small blocks, loading the small blocks into the furnace bottom, mixing and discharging part of aluminum ingots and crystalline silicon in new materials into the furnace, doping the large and small blocks of the furnace materials, trying to improve the compactness, and discharging the materials to a power frequency furnace.

Feeding electricity to melt, and adding new furnace materials while melting until all the furnace materials (except titanium additives, magnesium and antimony) are added; after all furnace materials are melted, the temperature is raised to 730 ℃, power is cut off, the titanium additive and the antimony are added firstly, then the magnesium is added, the furnace is pressed into the center of the furnace by a bell jar and moves slightly, and the magnesium is diffused to the periphery.

Electrifying to increase the temperature, homogenizing Ti and Sb elements by magnetic stirring, and cutting off the power when the smelting temperature is increased to 730-760 ℃;

taking a spectral analysis test block for spectral analysis, and adjusting chemical components to be qualified according to an analysis result;

after the components are qualified, the power is sent and the temperature is raised to 760 to 770 ℃, the power is cut off, and the aluminum liquid is transferred into a holding furnace and is transferred within 30 minutes. The temperature of the pre-transferring rotary ladle is preheated to 400-450 ℃, and the temperature of the heat preservation crucible furnace is preheated to 730-750 ℃.

Refining and modification treatment

Spreading a proper amount of aluminum slagging agent on the surface of aluminum liquid in the heat preservation furnace, kneading the scum in a stir-frying way by using a slagging tool, and fishing out the scum on the liquid level when the aluminum slag is obviously separated. The temperature of the molten aluminum is adjusted to 720-740 ℃, and a strontium salt modifier which accounts for 0.8-1% of the weight of the new molten aluminum is sprayed on the liquid surface.

Opening a switch of an argon bottle of the refiner, adjusting a flow meter to enable the reading of the flow meter to be 5-10L, putting a refining rotor head into a heat preservation furnace by a travelling crane, wherein the depth of the refining rotor head is not less than half of the depth of a furnace body, and setting the refining time of the refiner according to the air humidity (when the humidity is less than 50%, the refining time is set to be 5 minutes, when the humidity is more than or equal to 50% and less than or equal to 75%, the refining time is set to be 6 minutes, and when the humidity is more than or equal to 75%, the refining time is set to be 8 minutes).

Starting a refiner for refining, after refining is finished, using a slag removing tool to rub the strontium salt modifier in a stir-frying way, removing slag, and using a slag removing ladle to remove liquid level scum.

After refining and modification, immediately sampling and checking the refining effect (hydrogen content measurement) of the molten aluminum, and determining the requirement of hydrogen measurement result, wherein the density of the test block reaches more than 2.59g/cm < 3 > to be qualified, otherwise refining and degassing are required again until the requirement is met. Meanwhile, fracture inspection is required to be carried out; pouring 1 group of test bar test blocks in a furnace of 1; the pouring temperature of the sample is 720-740 ℃; taking 3 test blocks from molten aluminum in each furnace, and taking one test block from molten aluminum, modified aluminum and cast aluminum in the middle of casting; 3 test bars were taken and were done after 15 minutes of spoilage. And clear marks (date, furnace number and code) are made on the test bar test block according to requirements.

And (3) the time from the deterioration to the completion of pouring is not more than 3 hours, so that deterioration failure is prevented, otherwise, refining deterioration is required again, and a certain amount of magnesium is supplemented, wherein the supplement amount of the magnesium is 0.04 to 0.05 percent of the weight of the residual molten aluminum.

Aging treatment in T6 heat treatment: (Equipment: aluminum alloy aging furnace)

The aging treatment is a process of heating the aluminum alloy casting subjected to the solution treatment to a certain temperature, keeping the temperature for a certain time, discharging the aluminum alloy casting out of a furnace, and slowly cooling the aluminum alloy casting to room temperature in air, which is called aging. If the aging strengthening is performed at room temperature it is called natural aging, if the aging strengthening is performed after a period of incubation above room temperature it is called artificial aging. The aging treatment carries out a spontaneous process of decomposition of the supersaturated solid solution, thereby restoring the lattice of the alloy matrix to a relatively stable state.

The choice of ageing temperature and time depends on the requirements for the alloy properties, the characteristics of the alloy, the degree of supersaturation of the solid solution, the casting method, etc. Artificial aging can be divided into three categories: incomplete artificial aging, complete artificial aging and overaging. The incomplete artificial aging is to adopt a lower aging temperature or a shorter heat preservation time to obtain excellent comprehensive mechanical properties, namely, obtain higher strength, good plasticity and toughness, but the corrosion resistance may be lower. The complete artificial aging adopts higher aging temperature and longer heat preservation time to obtain the maximum hardness and the maximum tensile strength, but the elongation is lower. Overaging is carried out at higher temperatures, where the alloy retains higher strength while plasticity is improved, primarily for good stress corrosion resistance. In order to obtain a stable structure and geometry, the aging should be carried out at higher temperatures. Overaging is also generally classified into stabilization and softening treatments according to the application requirements.

Solution treatment: (facility: aluminum alloy solution hardening furnace)

The solution treatment is to heat the casting to the highest temperature possible, close to the melting point of the eutectic, the higher the temperature, the faster the dissolution rate of the strengthening elements and the better the strengthening effect. The upper limit of the heating temperature is generally lower than the initial overburning temperature of the alloy, and the lower limit is such that the strengthening component is dissolved in solid solution as much as possible. The temperature is maintained for a time sufficient to maximize dissolution of the strengthening elements, and the high temperature state is maintained at room temperature, and the holding time is determined by the rate of dissolution of the strengthening elements, depending on the type, composition, structure, casting method, and shape and wall thickness of the casting.

The rapid cooling during quenching is that the higher the cooling speed given to the casting is, the higher the degree of saturation of the solid solution stored in the high-temperature state is, so that the casting obtains high mechanical properties, but at the same time, the higher the formed internal stress is, the higher the possibility of deformation of the casting is, so that the temperature relationship to the cooling medium is great. This process is called solution treatment. The strength and plasticity of the casting can be improved by the solution treatment, and the corrosion resistance of the alloy is improved. The quenching transfer time of the solution heat treatment is as short as possible, and is generally not more than 15s, so as to prevent the diffusion precipitation of alloy elements to reduce the performance of the alloy.

Claims (7)

1. The utility model provides a front axle final drive casing casting mould which characterized in that: the front axle main speed reducer comprises a die body consisting of an upper die (3) and a lower die (2), two cylindrical side loose cores (17) which are arranged on the die body and are used for forming two bearing holes, and a sand core which is arranged in the die body and is used for forming the inner wall of a front axle main speed reducer shell;

the lower die (2) is provided with a movable die set used for forming the suspension arm, the movable die set comprises a side pulling block (18) and a movable block I (25), the movable block I (25) is arranged opposite to the side pulling block (18), and the lower die (2) is further provided with a movable block II (26) used for demoulding the suspension arm.

2. The front axle final drive shell casting mold of claim 1, characterized in that: the side surface of the lower die (2) is provided with a block drawing hole which is matched and installed with the side block drawing (18), the second movable block (26) is arranged above the suspension arm C, and the lower die is provided with an installation concave part which is matched with the second movable block (26).

3. The front axle final drive shell casting mold of claim 1, characterized in that: the outer end of the side pulling block (18) is connected with a vibration hammer (19) through a support rod (20).

4. The front axle final drive shell casting mold of claim 1, characterized in that: the surface of the sand core at the position corresponding to the boss side wall D of the inner end face of one bearing hole is provided with a first chiller (27), the surface of the sand core at the position corresponding to the boss side wall of the inner end face of the other bearing hole is provided with a fourth chiller (30), and the surface of the sand core at the position corresponding to the inner wall E of the front-end pipe orifice is provided with a third chiller (29) and a second chiller (28).

5. The front axle final drive shell casting mold of claim 1, characterized in that: the mould also comprises a material ejecting mechanism; the ejection mechanism comprises an ejection plate (9), an ejection fixing plate (10) and an ejection rod (15), the ejection fixing plate (10) is connected with the ejection plate (9), the reset rod (14) and the ejection rod (15) are fixedly arranged between the ejection plate and the ejection fixing plate, and the ends of the reset rod (14) and the ejection rod (15) are pressed by the ejection plate (9) and the ejection fixing plate (10); the length of ejector beam (15) and the surface parallel and level of different shapes in the mould die cavity, the length of each ejector beam (15) is inconsistent, the front end face of each reset rod (14) and the parting surface of the mould are parallel and level, and the length of each reset rod (14) is the same.

6. The front axle final drive shell casting mold of claim 1, characterized in that: the mould also comprises a pouring system and an exhaust rod (7); the pouring system comprises a pouring cup (1), a pouring gate and a riser, wherein the pouring cup (1) is arranged on the side face of the position die and is installed on the lower die, a pouring gate patch (4) is installed on the top face of the pouring gate part of the upper die, the front side face of the pouring gate patch is tightly attached to the inclined face part of the pouring cup, and the riser corresponds to the front end pipe orifice part of the main reducer shell and the bearing hole parts on the two sides of the main reducer shell.

7. The front axle final drive shell casting mold of claim 1, characterized in that: the front end of the side pulling block (18) is provided with a forming surface for forming the concave structure of the rear side surface of the suspension arm, and the second movable block (26) is provided with a forming surface for forming the concave structure of the front side surface of the suspension arm.

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