CN202155479U - Novel gravity casting pouring device applicable to lead-free brass - Google Patents

Abstract

The utility model discloses a novel gravity casting pouring device applicable to lead-free brass, which comprises an upper die, a lower die, a pouring gate and a sand core positioned between the upper die and the lower die. The sand core is provided with a cavity matched with a faucet in shape, the cavity connected with the pouring gate is used for pouring molten copper, the pouring gate is provided with an ingate and a pouring cup, and the ingate is arranged at the position of the cavity of the sand core for forming a water outlet portion of the faucet correspondingly. A cylindrical position with the cross section borne the highest tensile stress is first filled, so that sequential solidification is benefited, the problem of easiness in cracking during lead-free brass casting can be avoided, and further yield of faucets is greatly increased.

Description

A kind of novel gravitational casting pouring device that is applicable to no ledrite

Technical field

The utility model relates to the mould field of faucet body in the hot-water heating sanitary ware, relates to a kind of novel gravitational casting pouring device that is applicable to no ledrite in particular.

Background technology

As shown in Figure 1; It is general in the market a kind of faucet body 1; This faucet body 1 comprises cylindrical or type cylinder-shaped body 11 and is located at main body 11 sidepieces and generally is the outlet part 12 of flat; These main body 11 upper ends are formed with control mouthfuls 111, and the lower end is formed with and infeeds the water inlet 112 that water pipe inserts, and are inner then be formed with the confession spool and be installed on room 113 wherein; Be formed with water stream channel 121 and end in this outlet part 12 and offer delivery port 122; Current are discharged from delivery port 122 through room 113, water stream channel 121 after spool control successively.Present above-mentioned faucet body 1 generally is with the machine-shaping of ledrite gravitational casting; As shown in Figure 2; It is the process sketch map of gravitational casting casting; This casting die comprises patrix 21 and counterdie 22, is formed with casting gate 23 on the die joint of this patrix 21 and counterdie 22, is provided with core 24 between this patrix 21 and the counterdie 22; Be the sharp angle setting at this casting gate 23 of casting initial stage, along with progressively carrying out of casting, α becomes big gradually and finally equals 90 degree under the effect of auxiliary equipment, thereby accomplishes whole casting cycle.

But; The faucet body 1 that forms out by ledrite; Lead very easily comes off from matrix under the washing away of water and gets in people's water used in everyday, even if behind process or product abandonment, lead also can get into human body through the circulation back; Blood and nervous system to the people particularly cause irreversible damage to children's kidney and cranial nerve, hinder intelligence development.

Can produce the problem of injury to human body to lead; The applicant once worked out by bismuth Bi and replaced plumbous no ledrite; It has favorable mechanical performance and machinability, and also can meet international standards, but bismuth-containing Bi does not have lead bronze aspect the casting technique performance; Compared to common lead brass, have mobile relatively poor, be prone to hot tearing, subcutaneous micro-crack arranged, casting temperature is high and be prone to produce surface impurity and cause polishing problems such as bad.If continue to adopt common lead brass casting moulding process, then can have the low defective of yields, and directly influence the cost and the production efficiency of product, large-scale promotion application is not had lead bronze cause obstacle.

Shown in Fig. 3 and Fig. 3 A, it a kind ofly carries out the cast molding system (below abbreviating this system as scheme one) of gravitational casting based on ledrite and to faucet body 1 at present general, and its casting gate 23 is positioned at the excessive junction of main body 11 and outlet part 12; Shown in Fig. 4 and Fig. 4 A, it is present general another kind of cast molding system (below abbreviating this system as scheme two), and its casting gate 23 is located on the sidewall of main body 11 fully; Shown in Fig. 5, Fig. 5 A and Fig. 5 B, it is present general another cast molding system (below abbreviating this system as scheme three), and its casting gate 23 is arranged on the bottom of main body 11; In above-mentioned three kinds of schemes, this casting gate 23 is divided into ingate 231 that links to each other with die cavity and the pouring basin 232 of accepting external copper water.Because no lead bronze is mobile relatively poor, so often need higher copper coolant-temperature gage and mold temperature, so above-mentioned cast molding system schema one based on ledrite, scheme two and scheme three will be no longer suitable, can there be following defective in it:

One, scenarios ingate 231 all is arranged near the cylinder body 11, and the suffered tension in the position that copper water is full of at last in the scheme three is maximum: F=F1+F2+F3+F4; Though scheme one has reduced part tension: F=F1+F2+F3+F4-F5 with the lateral pull that scheme two has ingate 231 to produce; But these three kinds of scheme ingates 231 all are positioned at cross section to be received near the maximum position of tension; Be unfavorable for consecutive solidification; Cause because of cast gate washes away for a long time that mold temperature is high on the contrary, cooling slowly, for the generation of fire check provides condition;

Two, the ingate 231 thickness H of scenarios all with the wall thickness T of product near or equate, i.e. H1=H2=H3=T, thus make that copper water flows resistance is big, it is undesirable to fill type, particularly for scheme three, it is oversize that it fills the type flow process;

Three, pouring basin 232 cross-sectional areas of scenarios are all greater than ingate 231 cross-sectional areas (ingate 231 thickness multiply by width) and be contraction-like gradually; Gu Tongshui removes under the gravitate, also receives because casting gate 23 shrinks the pressure that produces gradually, makes that the flowing velocity at ingate 231 places is accelerated; Thereby acutely wash away near the die cavity the ingate 231; Owing to adopt no lead bronze, its cast temperature just improves 20 ℃～30 ℃, and mold temperature has improved 30 ℃～50 ℃; Cause near product defectives such as impurity, slag inclusion ingate 231, cause polishing impure point and pit etc. bad;

Four, scheme one and scheme two ingates 231 are flat; And all be arranged on the die joint of patrix 21 and counterdie 22; Nearly 90 ° turnover is arranged during the casting of copper water, and promptly it can vertically fall copper water toward counterdie 22 die cavities, thereby is easy to generate defectives such as melt fracture, slag inclusion and cold shut.

In view of this, the inventor has this case generation then to the above-mentioned defective further investigation when promoting no ledrite cast molding faucet body 1.

The utility model content

The purpose of the utility model is to provide a kind of novel gravitational casting pouring device that is applicable to no ledrite; The position that copper water is full of at last when solving the prior art moulding is positioned at the cylindrical portion that receives tension maximum, and is easy to generate fire check and influences the problem of product quality.

In order to reach above-mentioned purpose, the solution of the utility model is:

A kind of novel gravitational casting pouring device that is applicable to no ledrite; Comprise upper die and lower die, casting gate and the core between upper die and lower die; This core is formed with the die cavity that is matched with the faucet body shape; This die cavity links to each other with casting gate and supplies copper water to inject, and this casting gate has ingate and pouring basin; Wherein, this ingate correspondence is arranged on the die cavity place that is used for moulding faucet body outlet part.

Further, this ingate equals to be connected with ingate at the thickness of upper die and lower die and locates the degree of depth of die cavity, and lets the ingate place's die cavity that is connected with ingate be leveled up and down.

Further, this ingate is at the horizontal width of the die joint wall thickness greater than product to be formed.

Further, this die cavity also outwards protrudes out and is formed with overflow launder being used for moulding faucet body cylinder-shaped body place.

Further, this overflow launder is for dividing two that are located at the cylinder-shaped body both sides.

Further, this ingate is rectangular, and it is trapezoidal that this pouring basin then is.

After adopting said structure; A kind of novel gravitational casting pouring device that is applicable to no ledrite that the utility model relates to is because this ingate correspondence is arranged on the outlet part place that is used for the moulding faucet body, promptly away from position easy to crack; It makes cross section receive the maximum cylindrical portion of tension to fill type at first; Thereby help consecutive solidification, the position that so makes copper water be full of at last is positioned at the top of cylinder body, because the cylinder body upper space is to be used to locate spool; Screw thread, sealed compartment, valve core case installing hole etc. need be set when processing and manufacturing itself support the location interlayer; So itself just have the effect of dispersive stress, specifically shown in Fig. 6 C, F=F2+F4-F1-F3-F5-F6; Problem easy to crack when the utility model can avoid unleaded casting in bronze to make thus; Preferably see also shown in Fig. 6 A, the suffered tension of cylindrical cross section the most easy to crack has reduced in former scheme one, scheme two and the scheme three: F=F1+F2+F3+F4-F5-F6, simultaneously; Because equaling to be connected with ingate at the thickness of upper die and lower die, ingate locates the degree of depth of die cavity; Be that the ingate place's die cavity that is connected with ingate is leveled up and down, fill the smooth-going nothing of type and impact not have the unexpected turnover of traditional cast gate; Surface quality is good near the cast gate, thereby improves yield of products greatly.

Description of drawings

Fig. 1 is the structural representation of general faucet body on the market;

Fig. 2 is the sketch map of gravitational casting casting cycle in the prior art;

Fig. 3 is a kind of structural representation that faucet body is carried out the cast molding system of gravitational casting based on ledrite in the prior art;

Fig. 3 A is the cutaway view of A-A line among Fig. 3;

Fig. 4 is the another kind of structural representation that faucet body is carried out the cast molding system of gravitational casting based on ledrite in the prior art;

Fig. 4 A is the cutaway view of B-B line among Fig. 4;

Fig. 5 is for another carries out the structural representation of the cast molding system of gravitational casting in the prior art to faucet body based on ledrite;

Fig. 5 A is the vertical view of Fig. 5;

Fig. 5 B is the cutaway view of C-C line among Fig. 5;

Fig. 6 is a kind of structural representation that is applicable to the novel gravitational casting pouring device of no ledrite for utility model relates to;

Fig. 6 A is the cutaway view of D-D line among Fig. 6;

Fig. 6 B is the cutaway view of E-E line among Fig. 6;

Fig. 6 C is the cutaway view of G-G line among Fig. 6;

Fig. 7 is the sketch map of the utility model when reality is cast.

Among the figure:

Faucet body 1 main body 11

Control mouthful 111 water inlets 112

Room 113 outlet parts 12

Water stream channel 121 delivery ports 122

Patrix 21 counterdies 22

Casting gate 23 ingates 231

Pouring basin 232 cores 24

Overflow launder 33

The specific embodiment

In order further to explain the technical scheme of the utility model, come the utility model is set forth in detail through specific embodiment below.

As shown in Figure 6; A kind of novel gravitational casting pouring device that is applicable to no ledrite that relates to for the utility model shown in it; This gravitational casting pouring device is the same basically with structure of the prior art, promptly comprises patrix 21, counterdie 22, casting gate 23 and the core between upper die and lower die 24, and this core 24 is formed with the die cavity that is matched with faucet body 1 shape; This die cavity links to each other with casting gate 23 and supplies copper water to inject, and this casting gate 23 has ingate 231 and pouring basin 232; So said structure is not just set forth in detail.

The improvement of the utility model is: the position is set will be different from scheme of the prior art, scheme two and scheme three of this ingate 231; Concrete; These ingate 231 correspondences are arranged on the die cavity place that is used for moulding faucet body outlet part 12; This outlet part is away from position easy to crack, and promptly this ingate 231 also is to be communicated with the core die cavity, but the junction of ingate 231 and core die cavity is corresponding to the outlet part of faucet body.Preferably, this ingate 231 is rectangular, and 232 of this pouring basins are trapezoidal, thereby makes mobile more smooth and easy.

Like this, the utility model is in the cast molding process, and it can make cross section receive the maximum cylindrical portion of tension to fill type at first, thereby helps consecutive solidification.

So; The position that the utility model makes copper water be full of at last is positioned at the top of cylinder body; Because the cylinder body upper space is the effect of playing the location spool; Itself need be provided with more positioning element when processing and manufacturing, such as screw thread, sealed compartment and valve core case installing hole etc., so just there is the effect of dispersive stress in the structure of itself; The utility model can be avoided single problem easy to crack when making type unleaded casting in bronze as shown in Figure 1 thus, thereby improves yield of products greatly.

In order to reduce the flow resistance of copper water; Copper water can be full of whole die cavity as soon as possible in the cast molding process and let; Shown in Fig. 6 B; This ingate 231 equals to be connected with ingate 231 at the thickness H4 of upper die and lower die and locates the degree of depth M of die cavity, and be connected with ingate 231 die cavity at place of ingate 231 is leveled up and down.Simultaneously preferred, this ingate 231 is in the width L4 of the die joint wall thickness T greater than product to be formed.Like this, compare, wherein the width L1 of the thickness H1 of ingate 231, ingate 231 in scheme one with scheme one, scheme two and scheme three; The width L2 of the thickness H2 of ingate 231, ingate 231 in the scheme two, the width L3 of the thickness H3 of ingate 231, ingate 231 in the scheme three equates at ingate 231 cross-sectional areas; Be under the situation of S1=S2=S3=S4, S1=H1*L1 wherein, S2=H2*L2; S3=H3*L3, S4=H4*L4, the copper water flows is more smooth and easy; So mold-filling capacity is the strongest, flow process also farthest; It does not also have percussion simultaneously, thereby makes that near ingate 231 surface quality are good; Simultaneously please with reference to shown in Figure 7, in the reality casting, because flow resistance is little, flow velocity is enough fast; So need not to occupy whole ingate 231 during casting; Thereby make the gas in the die cavity freely to discharge, thereby reduce the chance that pore produces, have the effect that Forming Quality is good and defect rate is low.

Shown in Fig. 6 A, in order to mold better faucet body, this die cavity is being used for moulding faucet body cylinder-shaped body place, also outwards protrudes out to be formed with overflow launder 33.Through the moulding of this overflow launder 33, can produce horizontal tension, and then play the effect that reduces stress, and then improve the performance that molds faucet body.More preferably, overflow launder 33 is located at two of the cylinder-shaped body both sides for dividing, thereby further plays the effect that reduces stress.

Need to prove; The utility model can also be applicable to the tap of other type, and such as bowl basin, shower, bathtub and kitchen, faucet etc., wherein leading shape can be for of all kinds; Like square, deltiod, type cylindrical or the like, then differ one for example at this; In addition, the utility model is equally applicable to common lead brass, can solve common lead brass is prone to generation in casting casting flaw, improves yields greatly.

Product form of the foregoing description and graphic and non-limiting the utility model and style, the those of ordinary skill of any affiliated technical field all should be regarded as not breaking away from the patent category of the utility model to its suitable variation or modification of doing.

Claims (6)

1. novel gravitational casting pouring device that is applicable to no ledrite; Comprise upper die and lower die, casting gate and the core between upper die and lower die; This core is formed with the die cavity that is matched with the faucet body shape; This die cavity links to each other with casting gate and supplies copper water to inject, and this casting gate has ingate and pouring basin; It is characterized in that this ingate correspondence is arranged on the die cavity place that is used for moulding faucet body outlet part.

2. a kind of novel gravitational casting pouring device that is applicable to no ledrite as claimed in claim 1; It is characterized in that; This ingate equals to be connected with ingate at the thickness of upper die and lower die and locates the degree of depth of die cavity, and lets the ingate place's die cavity that is connected with ingate be leveled up and down.

3. a kind of novel gravitational casting pouring device that is applicable to no ledrite as claimed in claim 1 is characterized in that, this ingate is at the horizontal width of the die joint wall thickness greater than product to be formed.

4. a kind of novel gravitational casting pouring device that is applicable to no ledrite as claimed in claim 1 is characterized in that, this die cavity also outwards protrudes out and is formed with overflow launder being used for moulding faucet body cylinder-shaped body place.

5. a kind of novel gravitational casting pouring device that is applicable to no ledrite as claimed in claim 4 is characterized in that, this overflow launder is for dividing two that are located at the cylinder-shaped body both sides.

6. a kind of novel gravitational casting pouring device that is applicable to no ledrite as claimed in claim 1 is characterized in that this ingate is rectangular, and it is trapezoidal that this pouring basin then is.

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