CN114769557B

CN114769557B - Throttle valve die-casting die and manufacturing method thereof

Info

Publication number: CN114769557B
Application number: CN202210455489.6A
Authority: CN
Inventors: 简世劲; 袁静; 易方富
Original assignee: Zhanjiang Deni Vehicle Parts Co ltd
Current assignee: Zhanjiang Deni Vehicle Parts Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2023-06-20
Anticipated expiration: 2042-04-24
Also published as: CN114769557A

Abstract

The invention discloses a throttle valve die-casting die which comprises a movable die, a fixed die and a plurality of core-pulling mechanisms; the core pulling mechanisms are respectively connected with the fixed mold core and the movable mold core; the fixed die is provided with a sprue bush positioned below the fixed lining die, and the movable die is provided with a diversion cone positioned below the movable lining die and matched with the sprue bush; the lining fixing die is provided with a plurality of feeding channels connected with the diversion cone and the forming cavity; the movable mould and the fixed mould are both provided with an exhaust block connected with a forming cavity, the movable lining mould and the fixed lining mould are provided with a plurality of overflow grooves connected with the forming cavity and the exhaust block, the end face of the movable lining mould facing the fixed mould is uniformly provided with a net-shaped gas collecting groove, and the circumferential surface of the fixed mould core is provided with a plurality of vertical gas collecting grooves. According to the invention, the net-shaped gas collecting grooves are arranged on the lining mould, the vertical gas collecting grooves are arranged on the core, and the mode of connecting the slag ladle with the gas exhaust block is matched, so that the gas exhaust function of the mould is optimized, and the bad proportion of gas holes caused by gas wrapping in the injection process is effectively reduced.

Description

Throttle valve die-casting die and manufacturing method thereof

Technical Field

The invention belongs to the technical field of die casting, and particularly relates to a throttle valve die casting die and a manufacturing method thereof.

Background

The throttle valve body is used as a valve for engine air intake, and the opening angle of a throttle valve piece arranged on the throttle valve body determines the size of air intake, so that the throttle valve part is quite important, and the exposed air hole after processing is less than or equal to 0.4mm.

Because the product structure is complicated, the weight reduction part is many, and the product pore requirement is strict, therefore, the die casting die needs to have excellent exhaust function. However, the existing die casting die of the throttle valve is insufficient in exhaust function, so that the poor proportion of air holes caused by air wrapping in the injection process is high.

Disclosure of Invention

The invention provides a die-casting die for a throttle valve and a manufacturing method thereof, and aims to solve the problem that the die-casting die for the throttle valve in the prior art is insufficient in exhaust function.

The invention adopts the following technical scheme:

a throttle valve die casting die comprises a movable die, a fixed die and a plurality of core pulling mechanisms;

a fixed lining die and a fixed die core arranged in the fixed lining die are arranged in the fixed die, and the fixed lining die is provided with a fixed die cavity; a movable lining die and a movable die core arranged in the movable lining die are arranged in the movable die, the movable lining die is provided with a movable die cavity, and a molding cavity matched with the structure of the throttle valve is formed after the fixed die cavity and the movable die cavity are in butt joint; the core pulling mechanisms are respectively connected with the fixed mold core and the movable mold core;

the fixed die is provided with a sprue bush positioned below the fixed lining die, and the movable die is provided with a flow dividing cone positioned below the movable lining die and matched with the sprue bush; the lining mould is provided with a plurality of feeding channels connected with the diversion cone and the forming cavity;

the movable mould and the fixed mould are both provided with an exhaust block connected with the forming cavity, the movable lining mould and the fixed lining mould are provided with a plurality of overflow grooves connected with the forming cavity and the exhaust block, the end face of the movable lining mould facing the fixed mould is uniformly provided with a net-shaped air collecting groove, and the circumferential surface of the fixed mould core is provided with a plurality of vertical air collecting grooves.

In some embodiments, the fixed mold cavity and/or the movable mold cavity are provided with a plurality of slag ladles, and the slag ladles are mutually connected in series through the overflow grooves and are communicated with corresponding exhaust blocks.

In some embodiments, overflow grooves on the movable lining mould and the fixed lining mould, which are communicated with the front end of the air exhaust block, are arranged in a staggered way.

In some embodiments, the core pulling mechanism is provided with a first sliding block matched with a slag ladle of the fixed mold on the fixed mold, and the first sliding block is provided with a barb structure protruding into the slag ladle.

In some embodiments, the first slider has a draft angle of 1 ° -2 ° with the slag ladle.

In some embodiments, the core pulling mechanism is provided with a plurality of second sliding blocks, the fixed mold core is provided with a plurality of inner pouring gates, the end faces of the second sliding blocks are higher than the inner pouring gates, and the inner pouring gates are vertically connected with the fixed mold cavity.

In some embodiments, the second slider is provided with a groove at the junction of the in-gate and the fixed mold cavity, the groove being 1mm greater than the width of the corresponding in-gate.

In some embodiments, the end face of the fixed mold core, which faces the movable mold, is provided with mesh air-collecting grooves which are arranged in a grid shape, meanwhile, the movable mold core is also provided with mesh air-collecting grooves, and the mesh air-collecting grooves on the fixed mold core and the movable mold core are staggered and arranged in a non-overlapping manner.

In some embodiments, the core pulling device further comprises a die leg, wherein one core pulling mechanism is located at the bottom of the movable die and used for pulling core downwards, the die leg comprises a plurality of vertical blocks located at two sides and a plurality of connecting rods located at the bottom, the vertical blocks on the same side are fixedly connected with each other, the connecting rods are parallel to each other on the same height, two ends of the connecting rods are fixedly connected with the vertical blocks on the two sides respectively, and a core placing position is formed between the vertical blocks on the two sides.

A throttle manufacturing method, which adopts the throttle die casting die, the method comprises the following steps:

s1, preparing an aluminum alloy ingot;

s2, aluminum alloy ingots and waste furnace returns are subjected to the process according to the proportion of 5-6: 5-4, and putting the mixture into a continuous melting furnace for dissolution, wherein the temperature of the aluminum liquid is 710-750 ℃;

s3, mixing refining agent accounting for 0.2% of the weight of the furnace burden with the aluminum liquid, carrying out refining and dehydrogenation treatment by matching with a dehydrogenation device, and skimming and transferring to a machine side heat preservation furnace after the operation is finished, so as to ensure the temperature of the aluminum liquid to be 650-670 ℃;

s4, sequentially carrying out artificial hot die, low-speed hot die and low-pressure hot die on the die;

s5, injecting molten aluminum into the throttle valve die-casting die to perform die-casting production, and taking out a product after cooling;

s6, taking out the product, then automatically spraying and blowing the die, and measuring the temperature of the designated position of the die after the completion;

s7, removing a slag ladle and an overflow port of the product, and cutting off a pouring gate;

s8, removing burrs of the product and correcting bolt through holes on the product;

s9, performing shot blasting treatment on the surface of the product.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the net-shaped gas collecting grooves are arranged on the lining mould, the vertical gas collecting grooves are arranged on the core, and the mode of connecting the slag ladle with the gas exhaust block is matched, so that the gas exhaust function of the mould is optimized, and the bad proportion of gas holes caused by gas wrapping in the injection process is effectively reduced.

Drawings

The technology of the present invention will be described in further detail below with reference to the attached drawings and detailed description:

FIG. 1 is a schematic view of a movable die of a throttle die casting die of the present invention;

FIG. 2 is a schematic structural view of a stationary mold of the throttle die casting mold of the present invention;

FIG. 3 is a schematic view of the movable lining die of the throttle die casting die of the present invention;

FIG. 4 is a schematic structural view of a lining die of the throttle die casting die of the present invention;

FIG. 5 is a schematic structural view of a stationary mold core of the throttle die casting mold of the present invention;

FIG. 6 is a schematic view of a movable die air bleed block and a fixed die air bleed block of the throttle die casting die of the present invention;

FIG. 7 is a schematic view of the structure of the first slider of the throttle die casting die of the present invention;

FIG. 8 is a schematic view of the structure of a second slider of the throttle die casting die of the present invention;

fig. 9 is a schematic structural view of a die foot of the throttle die casting die of the present invention.

Reference numerals:

1-a movable mold; 11-moving lining mould; 12-moving mold cores;

2-fixing the mold; 21-lining a mould; 211-a feed channel; 22-a fixed mold core; 221-in-gate; 222-a vertical gas collecting channel;

3-a core pulling mechanism; 31-a first slider; 311-barb structure; 32-a second slider; 321-grooves;

4-an exhaust block; 41-a reinforcement groove;

5-an overflow trough;

6-slag ladle;

7-a net-shaped gas collecting tank;

8-mold legs; 81-standing blocks; 82-connecting rods; 83-core placement bit;

9-oil collecting blocks; 91-oil pipe.

Detailed Description

The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present invention. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The same reference numbers will be used throughout the drawings to refer to the same or like parts.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present invention are merely with respect to the mutual positional relationship of the constituent elements of the present invention in the drawings.

Referring to fig. 1 to 9, a throttle valve die casting die comprises a movable die 1, a fixed die 2 and a plurality of core pulling mechanisms 3.

Wherein, a fixed lining die 21 and a fixed die core 22 arranged in the fixed lining die 21 are arranged in the fixed die 2, and the fixed lining die 21 is provided with a fixed die cavity; a movable lining die 11 and a movable die core 12 arranged in the movable lining die 11 are arranged in the movable die 1, the movable lining die 11 is provided with a movable die cavity, and the fixed die cavity and the movable die cavity are in butt joint to form a forming cavity matched with the structure of a throttle valve; the core pulling mechanisms 3 are respectively connected with the fixed die core 22 and the movable die core 12. The movable mold 1 and the fixed mold 2 are clamped to form a molding cavity, so that die casting can be performed, and the core-pulling mechanism 3 withdraws the core. Depending on the actual situation, the core pulling direction of the core pulling mechanism 3 may be different, and may be up and down core pulling, front and back core pulling, left and right core pulling, and so on.

Wherein, the fixed die 2 is provided with a sprue bush positioned below the fixed lining die 21, and the movable die 1 is provided with a flow dividing cone positioned below the movable lining die 11 and matched with the sprue bush; the lining die 21 is provided with a plurality of feed channels 211 connecting the split cone and the forming cavity. Molten aluminum alloy is poured into a machine tool melting cup through a material taking spoon, aluminum liquid is pushed to a sprue bush through a machine tool punch, and is split by a split cone to reach an inner sprue 221 of a die from a feeding channel 211 and be sprayed into an empty forming cavity, and cooling and forming are carried out. The feed channel 211 is the runner.

The movable mould 1 and the fixed mould 2 are respectively provided with an exhaust block 4 connected with the forming cavity, the movable lining mould 11 and the fixed lining mould 21 are provided with a plurality of overflow grooves 5 connected with the forming cavity and the exhaust blocks 4, and in the aluminum liquid filling process, air in the cavity is discharged through the exhaust blocks 4, so that the air content in the finished casting is reduced. The end face of the movable lining mould 11, which faces the fixed mould 2, is uniformly provided with a net-shaped gas collecting groove 7, and the circumferential surface of the fixed mould core 22 is provided with a plurality of vertical gas collecting grooves 222. The end surfaces provided with the mesh-shaped gas collecting channel 7 and the vertical gas collecting channel 222 are the contact end surfaces of the die and the workpiece, and at the same time, the surfaces of the workpiece are the subsequent processing end surfaces. In the process of injecting aluminum liquid into the forming cavity, gas at the inner end face of the die is driven into the net-shaped gas collecting groove 7 and the vertical gas collecting groove 222, so that the processing end face gas holes are reduced. Wherein the cross section of the reticular gas collecting channel 7 is in a semicircular arc shape with R0.5. In addition, the round angle of the periphery of the processed end face part is 0.2-0.3mm larger than the processing allowance. In the casting, the allowance of the processing surface is 0.5mm, and the round angle of the periphery is set to be 0.7-0.8mm, so that the round angle of 0.2-0.3mm is remained on the periphery of the processing surface after the processing is finished, and the step of removing sharp burrs is avoided.

Preferably, the fixed mold cavity and/or the movable mold cavity are provided with a plurality of slag ladles 6, the slag ladles 6 are mutually connected in series through the overflow grooves 5 and are communicated with the corresponding exhaust blocks 4, the slag ladles 6 are connected in series through the overflow grooves 5 and are connected with the respective exhaust blocks 4, the connection among the slag ladles 6 is effectively enhanced, and the problem of abnormal shutdown caused by falling of the slag ladles 6 in the production process is avoided. Further, the overflow grooves 5 on the movable lining mold 11 and the fixed lining mold 21, which are communicated with the front end of the exhaust block 4, are arranged in a staggered manner, so that high-speed impact in the process of filling the aluminum liquid can be effectively buffered, and the aluminum liquid is caused to fly out of the mold.

Preferably, the core pulling mechanism 3 is provided with a first sliding block 31 matched with the slag ladle 6 of the fixed mold 2 on the fixed mold 2, the first sliding block 31 is provided with a barb structure 311 protruding into the slag ladle 6, after the aluminum liquid filling is completed, the slag ladle 6 is combined with the barb structure 311, and when the mold is opened, the first sliding block 31 is pulled out, and meanwhile, the slag ladle 6 of the fixed mold 2 is forcibly carried out. Wherein, in order to avoid the situation that the overflow of the slag ladle 6 is pulled apart when the first sliding block 31 is pulled out, and the slag ladle 6 falls into the mould when the product is ejected, the first sliding block 31 and the slag ladle 6 have a draft angle of 1-2 degrees, and in one embodiment, the draft angle is 1.5 degrees.

In some embodiments, the core pulling mechanism 3 is provided with a plurality of second sliders 32, the fixed mold core 22 is provided with a plurality of in-gates 221, and the end surface of the second sliders 32 is 15mm higher than the in-gates, so that the in-gates 221 are vertically connected with the fixed mold cavity, and a large transition angle is formed on the second sliders 32 for smooth feeding.

In some embodiments, the second slider 32 is provided with a groove 321 at the connection position between the in-gate 221 and the fixed mold cavity, the groove 321 is 1mm larger than the corresponding in-gate 221, after the aluminum liquid is filled, a boss is formed on the product, the product is disconnected from the boss when the material channel is removed, and the problem of meat falling of the product is avoided, wherein the height of the groove 321 is 2mm.

In some embodiments, the end surface of the fixed mold core 22 facing the movable mold 1 is provided with mesh gas collecting grooves 7 arranged in a grid shape, and the mesh gas collecting grooves 7 on the fixed mold core 22 and the movable mold core 12 are staggered and arranged to be misaligned, so as to further accommodate gas at the inner end surface of the mold in the injection process, and reduce gas holes at the machined end surface. Wherein the net-shaped gas collecting channel 7 does not extend to the in-gate 221.

Further, reinforcing grooves 41 for reinforcing the mold are provided on the exhaust block 4 of the movable mold 1 and the fixed mold 2, and the grooves 321 are oblong grooves having a radius of 1mm. In one embodiment, two rows of the reinforcing grooves 41 are arranged on the exhaust block 4 of the movable mold 1, one row of the reinforcing grooves 41 is arranged on the exhaust block 4 of the fixed mold 2, and the rows of the reinforcing grooves 41 on the movable mold 1 and the fixed mold 2 are staggered. The reinforcing groove 41 is beneficial to reinforcing the exhaust block 4, and the exhaust block 4 can be smoothly carried out during ejection.

In some embodiments, the die casting mold for the throttle valve of the present invention further includes a mold leg 8, wherein one core pulling mechanism 3 is located at the bottom of the movable mold 1, and is used for pulling core downward, the mold leg 8 includes a plurality of vertical blocks 81 located at two sides and a plurality of connecting rods 82 located at the bottom, the vertical blocks 81 on the same side are fixedly connected with each other, the plurality of connecting rods 82 are parallel to each other on the same height, two ends of the connecting rods are fixedly connected with the vertical blocks 81 on two sides, a core placing position 83 is formed between the vertical blocks 81 on two sides, after the mold is seated on the mold leg 8, a 5mm gap is formed between the core placing position and the mold, and the mold leg 8 are reinforced by using bolts, and when the mold is used, the bolts are loosened, and the mold is directly lifted from the mold leg 8, thereby being convenient and rapid, and simultaneously reducing the mold dumping risk.

In addition, as shown in fig. 1, one core pulling mechanism 3 of the throttle die casting mold of the present invention is located at the top of the movable mold 1, and is used for pulling core upwards, the side surface of the movable mold 1 is provided with an oil collecting block 9, the oil collecting block 9 is connected with hydraulic cylinders of the core pulling mechanisms 3 at the top and the bottom through an oil pipe 91 (i.e. the hydraulic cylinders are used as power of the core pulling mechanisms 3), and is connected with a hydraulic control loop, and the oil inlet and outlet interfaces of the cylinders of the core pulling mechanisms 3 at the top and the bottom are connected to the side surface of the mold, so that the difficulty of connecting the oil pipe 91 to the ground after the mold is installed on a machine tool can be greatly reduced.

s1, preparing an aluminum alloy ingot, wherein the aluminum alloy ingot comprises aluminum, silicon, copper, manganese, magnesium, nickel, zinc, tin, iron, lead, titanium, chromium and cadmium, and the mass percentage of each substance is as follows: 10.5 to 12 percent of silicon, 1.5 to 3.5 percent of copper, less than or equal to 0.5 percent of manganese, less than or equal to 0.3 percent of magnesium, less than or equal to 0.5 percent of nickel, less than or equal to 1 percent of zinc, less than or equal to 0.2 percent of tin, less than or equal to 1.3 percent of iron, less than or equal to 0.1 percent of lead, less than or equal to 0.3 percent of titanium, less than or equal to 0.1 percent of chromium, less than or equal to 0.01 percent of cadmium, and the balance of aluminum.

s4, sequentially carrying out artificial hot die, low-speed hot die and low-pressure hot die on the die. Specifically, a household gas is matched with a spray gun to carry out artificial hot die, a layer of butter is uniformly coated on a cavity part by using a brush before the hot die, all cooling water outside a split cone and a sprue bush is closed, the moving side and the fixed side are uniformly baked for 5min, and the artificial hot die enters a low-speed and low-pressure hot die.

S5, injecting molten aluminum into the throttle valve die-casting die to carry out die-casting production, and taking out the product after cooling. In the die casting process, the die casting process parameters are as follows: casting pressure of 750-800kg/cm ² The first section is 0.25m/s, the actual high-speed is 3.5-4m/s, the cooling time is 10s, and after the cooling time is finished, the movable die 1 and the fixed die 2 are separated, and the product is taken out.

S6, taking out the product, then automatically spraying and blowing the die, and measuring the temperature of the designated position of the die after the completion; wherein spraying, blowing and temperature measurement are automatically performed by a spraying machine.

S7, removing the slag ladle 6 and the overflow port of the product, and cutting off the pouring gate. After the product is taken out by the taking-out mechanical arm, the overflow port of the slag ladle 6 is manually removed, and then the slag ladle is placed on a stamping die to cut off the pouring gate.

S8, deburring the product and correcting the bolt through holes in the product. Specifically, adopt carving to mill machining center to remove parting line burr, in addition because the bolt hole position degree is relatively strict everywhere, reserve the machining allowance and use four-spindle drilling machine to correct the bolt via hole, other burrs are through artifical the removal.

S9, performing shot blasting treatment on the surface of the product. Specifically, uniformly hanging castings on a shot blasting hanger, spraying the surfaces of products by using stainless steel shots with the thickness of 0.3mm, further cleaning tiny burrs on the surfaces of workpieces, and improving the surface finish of the castings, wherein the stainless steel shots need to be processed into shot-shaped products, and the products are prevented from peeling in the shot spraying process.

Other contents of the throttle die casting mold and the manufacturing method thereof are referred to in the prior art, and are not described herein.

The present invention is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are within the scope of the technical proposal of the present invention.

Claims

1. The throttle valve die casting die is characterized by comprising a movable die, a fixed die and a plurality of core pulling mechanisms;

the movable mold and the fixed mold are both provided with an exhaust block connected with the forming cavity, the movable lining mold and the fixed lining mold are provided with a plurality of overflow grooves connected with the forming cavity and the exhaust block, the end face of the movable lining mold facing the fixed mold is uniformly provided with a net-shaped air collecting groove, and the circumferential surface of the fixed mold core is provided with a plurality of vertical air collecting grooves; the surfaces provided with the net-shaped gas collecting grooves or the vertical gas collecting grooves are the contact end surfaces of the die and the workpiece, and meanwhile, the surfaces of the workpiece are the subsequent processing end surfaces; in the process of hydraulically injecting aluminum into the forming cavity, the gas at the inner end surface of the die is driven into the net-shaped gas collecting groove and the vertical gas collecting groove, so that the processing end surface air holes are reduced;

the fixed die cavity and/or the movable die cavity are provided with a plurality of slag bags, and the slag bags are mutually connected in series through the overflow grooves and are communicated with the corresponding exhaust blocks;

the core pulling mechanism is provided with a first sliding block matched with a slag ladle of the fixed die, and the first sliding block is provided with a barb structure protruding into the slag ladle;

the first sliding block and the slag ladle have a draft angle of 1-2 degrees;

the end face of the fixed mold core, which faces the movable mold, is provided with meshed air collecting grooves which are arranged in a grid shape, and meanwhile, the movable mold core is also provided with meshed air collecting grooves which are staggered and arranged on the fixed mold core and the movable mold core and are not overlapped;

the core pulling mechanism is provided with a plurality of second sliding blocks, the fixed mold core is provided with a plurality of inner pouring gates, the end faces of the second sliding blocks are higher than the inner pouring gates, and the inner pouring gates are vertically connected with the fixed mold cavity; and a groove is formed in the joint of the inner gate and the fixed die cavity of the second sliding block, and the width of the groove is 1mm larger than that of the corresponding inner gate.

2. The die casting die for the throttle valve according to claim 1, wherein overflow grooves connected with the front end of the air exhaust block on the movable lining die and the fixed lining die are arranged in a staggered manner.

3. The die casting die for the throttle valve according to claim 1, further comprising a die leg, wherein one of the core pulling mechanisms is located at the bottom of the movable die and is used for pulling core downwards, the die leg comprises a plurality of vertical blocks located at two sides respectively and a plurality of connecting rods located at the bottom, the vertical blocks on the same side are fixedly connected with each other, the connecting rods are parallel to each other on the same height, two ends of the connecting rods are fixedly connected with the vertical blocks on the two sides respectively, and a core placing position is formed between the vertical blocks on the two sides.

4. A throttle valve manufacturing method, characterized by using the throttle valve die casting die as claimed in any one of claims 1 to 3, comprising the steps of:

s1, preparing an aluminum alloy ingot;

s9, performing shot blasting treatment on the surface of the product.