CN110216245A - 150 pound brake valve body seat riser-free mold and design method - Google Patents

Abstract

The invention relates to the technical field of valve body molds, in particular to a 150 pound brake valve body seat riser-free mold which comprises a valve body mold, wherein first flanges are fixedly connected to two sides of the valve body mold, a three-way valve port is communicated with the middle position of the upper end of the valve body mold, a second flange is fixedly connected to the top end of the three-way valve port, first blind risers are fixedly connected to the upper ends of two opposite sides of the first flanges, first open risers are fixedly connected to one opposite side of the first flanges, third blind risers are fixedly connected to each first flange below the first blind risers, second blind risers are fixedly connected to two sides of the upper end of the second flange, second open risers are fixedly connected to one side of the upper end of the second flange, a pouring mechanism is communicated between the two third blind risers, and a plurality of supplement channels are arranged in the valve body mold. The invention also provides a design method of the riser-free mold for the 150 pound brake valve body seat part. The invention has simple structure and is worth popularizing.

Description

A 150-pound gate valve body seat without riser mold and its design method

technical field

The invention relates to the technical field of valve body molds, in particular to a 150-pound gate valve body seat without a riser mold and a design method.

Background technique

The valve is a control component in the pipeline fluid delivery system. It is used to change the passage section and the flow direction of the medium. It has the functions of diversion, cut-off, throttling, check, diversion or overflow pressure relief. The flow of various types of fluids such as products, gases, mud, various corrosive media, liquid metals and radioactive fluids, the working pressure of the valve can be from 0.0013MPa to 1000Mpa ultra-high pressure, and the working temperature can be from -270℃ ultra-low temperature to 1430 ℃ high temperature. It can be seen from the above that with the acceleration of the reorganization of the valve industry, the future industry will be the competition between the quality and safety of valve products and product brands. Products will develop in the direction of high technology, high parameters, strong corrosion resistance, and high life. Technological innovation, development of new products, and technological transformation can gradually improve the technical level of products, meet the needs of domestic equipment, and fully realize the localization of valves.

Gate valve has the advantages of small flow resistance, less labor when opening and closing, simple shape, short structure length, and good manufacturing process. Therefore, gate valves are the most widely used industrial valves at present; the sealing performance of gate valves mainly depends on the seal between the gate plate and the seat of the valve body. Therefore, the quality of the casting seat of the gate valve body seriously affects the sealing performance of the gate valve. In the past, a riser was placed on the seat of the gate valve body to compensate the shrinkage of the seat and prevent shrinkage cavity defects in the seat; The gate valve body with no defects in the seat can also be produced without placing a riser on the inside.

Contents of the invention

The purpose of the present invention is to solve the shortcoming of shrinkage cavity defects in the seat part in the prior art, and propose a 150-pound gate valve body seat part without riser mold and design method.

In order to achieve the above object, the present invention adopts the following technical solutions:

Design a kind of 150 pounds gate valve body seat without riser mold, comprise valve body mold, described valve body mold is made up of upper mold and lower mold, and the both sides of described valve body mold are all fixedly connected with the first flange, so The middle position of the upper end of the valve body mold is connected with a three-way valve port, the top end of the three-way valve port is fixedly connected with a second flange, and the upper ends of the opposite sides of the two first flanges are fixedly connected with a second flange. A dark riser, the opposite sides of the two first flanges are fixedly connected with a first open riser, and each of the first flanges is fixedly connected below the first dark riser There is a third hidden riser, and the two sides of the upper end of the second flange are fixedly connected with the second dark riser, and the upper end side of the second flange is fixedly connected with the second open riser, and the two described A pouring mechanism is communicated between the third hidden risers, and a plurality of supplementary channel mechanisms are arranged inside the valve body mold.

Preferably, the first dark riser and the third dark riser are distributed symmetrically.

Preferably, both sides of the valve body mold are fixedly connected with several reinforcing protrusions.

Preferably, two heat dissipation protruding strips are fixedly connected to the mold of the valve body below the three-way valve port.

Preferably, the pouring mechanism includes a runner, both ends of the runner are connected to the third riser, and the middle side of the runner is connected to a sprue through a ceramic pipe seat.

Preferably, a plurality of cooling joints are fixedly connected to opposite sides of the two first flanges, and the cooling joints are evenly distributed.

Preferably, the supplementary channel mechanism includes a first thermal pitch circle, the first thermal pitch circle is fixed on the valve body mold, one side of the first thermal pitch circle is fixedly connected with a second thermal pitch circle, A tapered supplementary channel is provided between the first thermal pitch circle and the second thermal pitch circle.

Preferably, the diameter of the second thermal pitch circle is larger than the diameter of the first thermal pitch circle.

The present invention also provides a method for designing a die without a riser at the seat of a 150-pound gate valve body, comprising the following steps:

S1: Selection and design of the sprue. Select the appropriate size of the sprue according to the weight of the molten steel in the casting. In order to reduce the impact of the molten steel on the sand mold of the runner and the tendency of air entrainment, the lower mold of the runner adopts an arc shape, and the upper mold In order to match the arc shape of the molten steel flow tendency and to make the molten steel fill the mold cavity quickly and stably, the pouring system adopts an open pouring system, and the total cross-sectional area of the runner must be greater than or equal to twice the cross-sectional area of the sprue;

S2: Selection of riser and cold iron, calculate the hot section modulus of the gate valve body and the required supplementary weight of the riser, and select the corresponding riser that satisfies the two according to the calculation results. The gas floats effectively to reduce casting slag holes and air holes. An open riser is installed on the top of the three flanges, and artificial cold ends are made of cold iron. The size of the cold iron is selected according to the diameter of its hot node circle. The selection principle is cold iron The thickness is greater than the radius of the hot pitch circle and less than or equal to the diameter of the hot pitch circle, and then the supplementary distance is calculated from the size of the hot pitch circle, and the corresponding number of risers is selected according to the placement of the cold iron;

S3: According to the supplementary channel structure of the gate valve body seat in S2, calculate the thermal node circle at the hot joint of the gate valve body seat, and obtain the required supplementary channel size according to the feeding sequence of M _casting : M _{riser neck} = 1:1.1, According to the size of the hot pitch circle of the seat of the gate valve body, the supplementary distance and matching cold iron are calculated to determine the number of supplementary channels.

A 150-pound gate valve body seat without a riser mold and design method proposed by the present invention has the beneficial effect that: the present invention cancels the original placement on the gate valve body by adding the method of adding the end flange to the gate valve body seat. The riser of the body seat, this new process design can improve the utilization rate of molten steel, greatly reduce the workload of post-processing of the gate valve body, improve production efficiency and reduce production costs.

Description of drawings

Fig. 1 is the structural representation of a kind of 150 pounds of gate valve body seat parts without riser die that the present invention proposes;

Fig. 2 is the front view structural representation of a 150-pound gate valve body seat without a riser mold proposed by the present invention;

Fig. 3 is the cross-sectional structure schematic diagram of a kind of 150 pounds of gate valve body seats without riser die that the present invention proposes;

Fig. 4 is a schematic structural view of the channel supplementary mechanism in the present invention;

Fig. 5 is a schematic cross-sectional structural diagram at A-A of Fig. 4 in the present invention.

In the figure: valve body mold 1, first flange 2, three-way valve port 3, second flange 4, first dark riser 5, second dark riser 6, first open riser 7, second open riser Riser 8, third dark riser 9, runner 10, sprue 11, reinforcing protrusion 12, heat dissipation raised strip 13, heat dissipation section 14, first heat section circle 15, second heat section circle 16, Cone added 17.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

Referring to Figures 1-5, a 150-pound gate valve body seat without a riser mold includes a valve body mold 1. The valve body mold 1 is composed of an upper mold and a lower mold. Both sides of the valve body mold 1 are fixedly connected with a first Flange 2, the valve body mold 1 is located below the first flange 2 to install a cold iron to speed up the cooling of the pouring liquid. The middle position of the upper end of the valve body mold 1 is connected with a three-way valve port 3, and the three-way valve port 3 The top end is fixedly connected with a second flange 4, and a cold iron is installed in the second flange 4 between the second dark riser 6 and the second open riser 8, and the upper ends of the opposite sides of the two first flanges 2 Both are fixedly connected with a first dark riser 5, the function of the first dark riser 5 is to avoid shrinkage cavity depression in the first flange 2, and the opposite sides of the two first flanges 2 are fixedly connected with a first bright riser. Riser 7, the function of the first open riser 7 is to discharge gas, has a feeding effect, and can better observe the pouring situation in the valve body mold 1, and each first flange 2 is located on the first dark riser 5 The lower part of the flange is fixedly connected with a third dark riser 9 to prevent shrinkage holes in the first flange 2, the first dark riser 5 and the third dark riser 9 are symmetrically distributed, and both sides of the upper end of the second flange 4 are fixed A second dark riser 6 is connected, and the function of the second dark riser 6 is to avoid shrinkage holes in the second flange 4. The upper end side of the second flange 4 is fixedly connected with a second open riser 8, and the second open riser 8 The riser 8 is convenient for observing the pouring situation in the three-way valve port 3 .

There is a pouring mechanism connected between the two third risers 9. The function of the pouring mechanism is to introduce the pouring liquid into the valve body mold 1. The pouring mechanism includes a runner 10. The lower mold of the runner 10 adopts an arc shape. The mold is arc-shaped to match the flow tendency of molten steel, which can make the molten steel fill the mold cavity quickly and stably. Both ends of the runner 10 are connected to the third dark riser 9, and the middle side of the runner 10 is connected to a sprue 11 , The interior of the valve body mold 1 is provided with a plurality of supplementary channel mechanisms, and the function of the supplementary channel mechanisms is to replenish when the internal pouring liquid is lacking, so as to avoid the phenomenon of depression.

The supplementary channel mechanism includes a first thermal segment circle 15, which is fixed on the valve body mold 1, and one side of the first thermal segment circle 15 is fixedly connected with a second thermal segment circle 16, and the second thermal segment circle 16 The diameter is greater than the diameter of the first thermal segment circle 15, and a tapered supplementary channel 17 is opened between the first thermal segment circle 15 and the second thermal segment circle 16, and several reinforcing protrusions are fixedly connected to both sides of the valve body mold 1. 12, the function of the reinforcing protrusion 12 is to enhance the strength of the valve body mold 1, and the valve body mold 1 is fixedly connected with two heat dissipation protrusions 13 below the three-way valve port 3, and the function of the heat dissipation protrusions 13 is To speed up the heat dissipation of the valve body mold 1, several heat dissipation joints 14 are fixedly connected to the opposite sides of the two first flanges 2. The function of the heat dissipation joints 14 is to enhance the heat dissipation on both sides of the valve body mold 1 and avoid If the first flange 2 is overheated, the cooling joints 15 are evenly distributed.

The present invention also provides a method for designing a die without a riser at the seat of a 150-pound gate valve body, comprising the following steps:

S1: Selection and design of the sprue. Select the appropriate size of the sprue according to the weight of the molten steel in the casting. In order to reduce the impact of the molten steel on the sand mold of the runner and the tendency of air entrainment, the lower mold of the runner adopts an arc shape, and the upper mold In order to match the arc shape of the molten steel flow tendency and to make the molten steel fill the mold cavity quickly and stably, the sprue is selected as a φ50 ceramic tube sprue, the lower mold of the runner is a semicircle with a radius of 29cm, and the upper mold is an arc with a radius of 32cm. The channel is double-inlet, and the pouring system adopts an open pouring system. The total cross-sectional area of the runner must be greater than or equal to twice the cross-sectional area of the sprue;

S2: Selection of riser and cold iron, calculate the hot section modulus of the gate valve body and the required supplementary weight of the riser, and select the corresponding riser that satisfies the two according to the calculation results. The gas floats effectively to reduce casting slag holes and air holes. One open riser is installed on the top of the three flange faces, and two hidden risers are placed at the parting line of the three flanges. The artificial cold end is made of cold iron. The size of the iron is selected according to the diameter of the hot pitch circle. The principle of selection is that the thickness of the cold iron is greater than the radius of the hot pitch circle and less than or equal to the diameter of the hot pitch circle. Then the supplementary distance is calculated from the size of the hot pitch circle, and a cold iron is placed on the lower die of the flange. A cold iron is placed between the dark riser and the open riser of the upper mold of the flange;

S3: According to the structure of the supplementary channel of the gate valve body seat in S2, calculate the thermal node circle at the hot joint of the gate valve body seat, and according to the feeding sequence of M _casting : M _{riser neck} = 1:1.1, the supplementary channel of the gate valve body seat is obtained The size of the hot section circle at the seat is φ30 to the conical supplementary channel at the root of the end flange. The hot section circle is φ50. According to the size of the hot section circle at the seat of the gate valve body, the supplementary distance and the matching cold iron are calculated to determine the number of supplementary channels. There are four at both ends of the end flange, eight in total.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (9)

1. a kind of 150 pounds of brake valve body portions are without hot top mould, including Valve Block Mould (1), the Valve Block Mould (1) by upper mold and Lower mold composition, the two sides of the Valve Block Mould (1) are fixedly connected to first flange (2), the upper end of the Valve Block Mould (1) Middle position is communicated with threeway valve port (3), and the top of the threeway valve port (3) is fixedly connected with second flange (4), feature It is, two opposite side upper ends of the first flange (2) are fixedly connected to the first blind riser (5), and two described first The opposite side of flange (2) is fixedly connected to the first open riser (7), and described first is located on each first flange (2) It is fixedly connected to below blind riser (5) third blind riser (9), the upper end two sides of the second flange (4) are fixedly connected with Have the second blind riser (6), the upper end side of the second flange (4) is fixedly connected with the second open riser (8), two thirds Casting mechanism is communicated between blind riser (9), mechanism is added equipped with multiple in the inside of the Valve Block Mould (1).

2. a kind of 150 pounds of brake valve body portions according to claim 1 are without hot top mould, which is characterized in that described first is dark Riser (5) and the third blind riser (9) are symmetrical.

3. a kind of 150 pounds of brake valve body portions according to claim 1 are without hot top mould, which is characterized in that the valve body mould The two sides of tool (1) are fixedly connected to several and reinforce raised (12).

4. a kind of 150 pounds of brake valve body portions according to claim 1 are without hot top mould, which is characterized in that the valve body mould It is located at below the threeway valve port (3) on tool (1) there are two being fixedly connected heat bulge item (13).

5. a kind of 150 pounds of brake valve body portions according to claim 1 are without hot top mould, which is characterized in that the casting machine Structure includes cross gate (10), and the both ends of the cross gate (10) are connected to the third blind riser (9), the cross gate (10) Middle position side is communicated with sprue (11) by earthen-ware pipe seat.

6. a kind of 150 pounds of brake valve body portions according to claim 1 are without hot top mould, which is characterized in that two described The opposite side of one flange (2) is fixedly connected to several heat dissipation sections (14), and the heat dissipation section (15) is uniformly distributed.

7. a kind of 150 pounds of brake valve body portions according to claim 1 are without hot top mould, which is characterized in that described to add Mechanism includes the first thermal center circle (15), and the first thermal center circle (15) is fixed on the Valve Block Mould (1), first thermal center The side of circle (15) is fixedly connected with the second thermal center circle (16), first thermal center circle (15) and second thermal center circle (16) it Between offer taper and add (17).

8. a kind of 150 pounds of brake valve body portions according to claim 7 are without hot top mould, which is characterized in that second heat The diameter of pitch circle (16) is greater than the diameter of first thermal center circle (15).

9. the 150 pounds of design methods of brake valve body portions without hot top mould of one kind, feature described in -8 exist according to claim 1 In including the following steps:

S1: the selection and design of running channel select suitable sprue size according to casting Metal Weight, to reduce molten steel to cross The impact force and volume gas of running channel sand mold are inclined to, and cross gate lower die uses arc-shaped, and upper mold is the arcuation for cooperating MOLTEN STEEL FLOW tendency, For make molten steel quick and stable full of die cavity, running gate system uses unchoked running system, and cross gate total sectional area need to be greater than etc. In 2 times of sprue sectional area；

S2: the cooperation selection of riser and chill calculates brake valve body hot section modulus mold number and required riser supplements weight, according to calculated result The correspondence riser that selection both meets reduces casting slag to make field trash in casting process in molten steel and gas effectively float Hole, stomata are respectively arranged an open riser on three flange face tops, manufacture artificial cold end using chill, the size of chill is according to it Thermal center circular diameter is chosen, and selection principle is that chill thickness is greater than thermal center radius of circle less than or equal to thermal center circular diameter, then is justified by thermal center Size calculates supplement distance, cooperates the placement of chill, selects corresponding riser quantity；

S3: adding structure according to brake valve body portions in S2, thermal center circle at brake valve body portions thermal center is calculated, according to M_Casting:M_{Riser neck}= The feeding sequence of 1:1.1, adds size needed for obtaining, according to brake valve body portions thermal center circle size, supplement distance is calculated And cooperation chill, so that it is determined that adding quantity.