CN208628220U - A kind of high wave height expansion joint molding machine of heavy wall - Google Patents

Abstract

A kind of high wave height expansion joint molding machine of heavy wall, it includes cold pushing away machine and molding die, it is described it is cold push away machine and be connected with can while apply the left push top (1) of same thrust and right push top (2) in opposite directions, left push top (1) and the right left and right both ends of (2) respectively with former material expects pipe (3) of having a haircut offset；The molding die is made of upper mold (4) and lower die (5), upper mold (4) and lower die (5) are equipped with the continuous semi-ring connected in star (6) for being used to form expansion joint, are equipped with the central through hole (7) for the injection pressure medium into former material expects pipe at the center of left push top (1) and right push top (2)；Pressure medium forces the raw material tube wall at semi-ring connected in star (6) to expand into annular groove, at the same left push top (1) and right push top (2) by the raw material at both ends to supplement at annular groove to prevent wall thickness thinning.The utility model structure is simple, high production efficiency, stable and reliable product quality.

Description

A kind of high wave height expansion joint molding machine of heavy wall

Technical field

The utility model relates to a kind of forming technique of the high wave height expansion joint of heavy wall, which has very high intact Property, safety and reliability, make the performance of product meet the requirement of product, to guarantee that the reliability level of key equipment reaches The technical requirements qualitative and quantitative to defined reliability.This kind of product is widely used in the fields such as nuclear power, petrochemical industry.Specifically It is a kind of high wave height expansion joint molding machine of heavy wall that ground, which is said,.

Background technique

Currently, a kind of elastic compensating device of the expansion joint as vibration isolation, noise reduction and pressure-bearing, in operation, except generation It is displaced (deformation) outside, often still suffers from certain operating pressure.This large-scale corrugated-type expansion joint is set using U-shaped single axial Meter, manufacturing process common for the manufacture of U-shaped corrugated-type expansion joint has: mechanical expansion type, hydro-forming, roll forming and being welded into Type, various forming methods cut both ways, but for heavy caliber, heavy wall, Gao Bogao U-shaped corrugated-type expansion joint, in addition to welding fabrication Conventional fabrication processes can't effectively solve molding problem of Cracking.But the corrugated-type expansion joint of welding fabrication depositing due to weld seam In, welding point and corrugated-type expansion joint base material, that there is mechanical properties is discontinuous, structural type shape is discontinuous, microstructure does not connect It is continuous, while welding defect is also inevitable, these have seriously affected the safe and reliable operation of product.

Utility model content

The purpose of this utility model is for the problem that existing expansion joint complex forming technology, and performance is difficult to ensure, if Count a kind of simple and convenient, the high wave height expansion joint molding machine of stable and reliable quality heavy wall of molding.

The technical solution of the utility model is:

A kind of high wave height expansion joint molding machine of heavy wall, it include it is cold push away machine and molding die, it is described cold to push away machine connection Have can while apply in opposite directions same thrust it is left push top 1 and it is right push top 2, it is left push top 1 and it is right push top 2 respectively with a left side for former material expects pipe 3, Right both ends offset；The molding die is made of upper mold 4 and lower die 5, and upper mold 4 and lower die 5 are equipped with and are used to form expansion joint Continuous semi-ring connected in star 6 is equipped at the center of left push top 1 and right push top 2 for into former material expects pipe in injection pressure medium Heart through-hole 7；Pressure medium forces the raw material tube wall at semi-ring connected in star 6 to expand into annular groove, while left push top 1 and the right side Push top 2 is by the raw material at both ends to supplement at annular groove to prevent wall thickness thinning.

The pressure medium is water.

The quantity of the central through hole 7 is two, and one of central through hole is connected with check valve, another center is logical Hole is connected with relief valve.

The utility model has the beneficial effects that

The utility model has filled up domestic blank, lays the foundation for large-scale sodium-cooled fast reactor evaporator production domesticization.

The problem of the utility model effective solution molding cracking and welding fabrication cause the welding point swollen with waveform That there is mechanical properties is discontinuous for swollen section base material, planform is discontinuous, microstructure is discontinuous and other welding defects are asked Topic, has innovated traditional handicraft, the reasonable implementation innovative point in manufacturing process.Considerably increase the reliability and raising of production The productivity effect of product.

The utility model structure is simple, high production efficiency, stable and reliable product quality.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model.

Fig. 2 is the manufacturing process schematic diagram of the utility model.

Fig. 3 is the forming step exploded view of the utility model.

Fig. 4 is the forming process schematic diagram of the utility model.

Specific embodiment

The utility model is further described with reference to the accompanying drawings and examples.

As shown in Figs 1-4.

A kind of high wave height expansion joint molding machine of heavy wall, it include it is cold push away machine and molding die, it is described cold to push away machine connection Have can while apply in opposite directions same thrust it is left push top 1 and it is right push top 2, it is left push top 1 and it is right push top 2 respectively with a left side for former material expects pipe 3, Right both ends offset, as shown in Figure 1；The molding die is made of upper mold 4 and lower die 5, and upper mold 4 and lower die 5 are equipped with and are used for shape At the continuous semi-ring connected in star 6 of expansion joint, it is equipped at the center of left push top 1 and right push top 2 for injecting pressure into former material expects pipe The central through hole 7 of power media (water), the quantity of central through hole 7 are two, and one of central through hole is connected with check valve, another A central through hole is connected with relief valve.；Pressure medium forces the raw material tube wall at semi-ring connected in star 6 swollen into annular groove It is swollen, at the same left push top 1 and right push top 2 by the raw material at both ends to supplement at annular groove to prevent wall thickness thinning.

Traditional swollen forming technique of simple liquid is on the one hand changed to one side liquid swollen one by the molding machine of the utility model Pusher compensation molding in side is thinned, and makes no longer to be thinned when molding or Reducing thickness is greatly reduced, since the compensating action of pushing can have Not caused enough the problem of Cracking of the solution elongation percentage of effect；On the other hand it can be equipped at working hardening heat among multistep molding Reason, to prevent cracking caused by working hardening.

The entire manufacturing process of the utility model is as shown in Fig. 2, the rightmost side Fig. 4 is expansion bellow exemplar product figure.Such as Fig. 3 first pushes away machine up-regulation reshaping die cold, then former material expects pipe is put into mold；It is cold push away machine push top contact pipe fitting when Medium water is poured by check valve and reaches authorized pressure, if pressure is excessive, can pass through relief valve pressure release；Have a haircut pushing when It waits, while the pressure of water makes pipe fitting deformation occurs, pusher compensates lightening holes；It is left in pipe fitting deformation 50% such as Fig. 4 The right side is further continued for pushing after being heat-treated to semi-finished product, until expansion bellow forms.

The material of former material expects pipe as shown in Figure 4 is P22, and pipeline section outer diameter 114mm, wave height 60mm, deformation ratio is more than 105%, far Much higher than the deformation ratio of general expansion joint, the corrugated-type expansion joint that difficulty is significantly larger than evaporator is formed.When material tensile deformation Necking is just had after reaching surrender, the seamless expansion bellow molding of wave height high for this heavy caliber usually has following difficulty Point:

A. workpiece will be pulled off under stretcher strain state when deformation rate is more than the elongation percentage of the workpiece material；

B. material deformation can be deformed reinforcing (processing hardening).Different material deformation strengthening effects is different, works as change Shape is strengthened when be more than to a certain degree, will crack when continuing to active force or even brittle failure.

Therefore, multistage heat treatment should be carried out by the program of Fig. 3 during pushing is molding:

If Fig. 3 shows, to prevent from occurring phenomena such as cracking in the fabrication process, pushing-heat treatment-should be taken in molding procedure The technique of pushing.For EJMA standard, the molding of the clear expansion joint of the manufacturing method of expansion bellow can be according to ripple The waveform of pipe is divided into several stages, is gradually formed using intermediate heat-treatment.P22 material, belongs to low-alloy steel, and AC3 is about 862 DEG C, AC1 is about 781 DEG C, and there are three types of heat treatment methods as defined in standard: full annealing, isothermal annealing and normalizing+tempering.

According to applicant carry out a large number of experiments research obtain to deformation ratio, intermediate heat-treatment order, temperature to final The affecting laws of properties of product after product heat treatment summarize following heat treatment main points:

A. heat treatment is first normalized

Organization decided performance, this therefore is made by suitable heating process swollen for the material of identical component The tissue of swollen section everywhere is consistent, grain size is consistent (so-called unanimously to refer in certain zone of reasonableness).

B, implement normalizing+tempering heat treatment process by verification experimental verification again.

Following seizure test project is carried out after formed product:

-- appearance, dimension control are carried out according to drawing；

Chemical component, mechanical property (room temperature performance, high temperature according to III NH bundling of ASTM A335 and ASME to product Performance), metal lographic examination, impact test；

-- it requires to carry out pressure testing to product according to VIII -1 appendix 26 of ASME, ASME III ND-5700, EJMA；

Show that the molding corrugated-type expansion joint of the utility model fully meets client and standard requirements through above-mentioned seizure test, it is real The seamless design and manufacture of nuclear power, petroleum and petrochemical industry evaporator heavy caliber, heavy wall, Gao Bogao corrugated-type expansion joint are showed.

The parts not involved in the utility model is the same as those in the prior art or can be realized by using the prior art.

Claims (3)

1. a kind of high wave height expansion joint molding machine of heavy wall, it include it is cold push away machine and molding die, the cold machine that pushes away is connected with The left push top (1) of same thrust and right push top (2) can be applied in opposite directions simultaneously, left push top (1) and right push top (2) respectively with former material expects pipe (3) left and right both ends offset；The molding die is made of upper mold (4) and lower die (5), and upper mold (4) and lower die (5) are equipped with It is used to form the continuous semi-ring connected in star (6) of expansion joint, at the center of left push top (1) and right push top (2) equipped with for former material The central through hole (7) of injection pressure medium in expects pipe；Pressure medium forces the raw material tube wall at semi-ring connected in star (6) to annular Expanded in groove, at the same left push top (1) and right push top (2) by the raw material at both ends to supplement at annular groove to prevent wall thickness from becoming It is thin.

2. the high wave height expansion joint molding machine of heavy wall according to claim 1, it is characterized in that the pressure medium is water.

3. the high wave height expansion joint molding machine of heavy wall according to claim 1, it is characterized in that the central through hole (7) Quantity is two, and one of central through hole is connected with check valve, another central through hole is connected with relief valve.