349 results about "Ductile iron" patented technology

This invention relates to a vermicular cast iron alloy with high mechanical strength and thermal conductivity requirements to replace the conventional gray and vermicular cast irons and introduces a manufacturing process for high mechanical strength and thermal conductivity vermicular cast iron alloy and internal combustion engine parts produced from said alloy. The alloy includes carbon, manganese, tin, copper, molybdenum, silicon, magnesium, rare earths, chromium, titanium, niobium, vanadium, tungsten, phosphorus, sulfur, aluminum, and nickel. The alloy has a graphite microstructure consisting of up to 70% of vermicular particles and up to 30% of nodular particles in area, with a matrix in area up to 80% pearlitic and up to 20% ferritic, with presence of segregating carbides of up to 1%.

The invention belongs to the technical field of laser cladding, and relates to a nodular cast iron crosshead with laser-cladded babbitt metal on the surface and a preparation method of the nodular cast iron crosshead. The base material with the set thickness is removed from the to-be-cladded area of the crosshead body, and an appropriate space is provided for subsequent cladding of a component gradient transition area and a babbitt metal cladding layer. Babbitt metal powder is adopted for cladding the component gradient transition area on the to-be-cladded area, so that smooth transition from the nodular cast iron matrix to the Babbitt metal cladding layer can be realized, and a direct basis for forming high-strength metallurgical bonding is provided. And cladding a babbitt metal cladding layer on the component gradient transition area by adopting babbitt metal powder, and finally forming an antifriction layer with excellent wear resistance and seizure resistance on the crosshead working surface. And the cladding babbitt metal cladding layer is machined till the crosshead body is machined to the standard size, and the installation precision of the crosshead body and the matching precision of the crosshead body and other components are guaranteed.

The invention discloses high-strength wear-resistant wind power ductile iron and a processing technology thereof, and belongs to the technical field of casting. The processing technology of the high-strength wear-resistant wind power ductile iron comprises the following steps: A1, sequentially adding waste steel, a carburant, pig iron, foundry returns and ferroniobium into an intermediate frequency furnace, standing after all furnace charges are molten, and removing slag; a2, a spheroidizing agent, a nucleating agent, metal antimony, titanium carbide and a covering agent are sequentially added to the bottom of a steel ladle, and then molten iron in the step A1 is poured into the steel ladle for spheroidizing and inoculation; a3, the molten iron obtained after spheroidizing and inoculation is subjected to slagging-off and then poured into a casting mold, and a stream inoculant is added in the pouring process; a4, after pouring is finished, slowly cooling in the sand mold to below 400 DEG C, and removing a casting from the casting mold; and A5, the casting is subjected to pulse current quenching treatment and then subjected to pulse current normalizing treatment, and the high-strength wear-resistant wind power ductile iron is obtained. The prepared high-strength wear-resistant wind power ductile iron is high in strength and good in wear resistance, and the low-temperature impact performance meets the requirement of QT500-14AL.

Reaming tool for reaming very precise bores, especially in gray and ductile iron, comprising a clamping element adapted for clamping in the clamping devices of machine tools, and a cutting element according to the invention, on the circumferential part of which at least two cylindrical longitudinal support surfaces with an angular distance of 60° to 160° are formed, and on the remaining circumference of the cutting element at least three cutting teeth with longitudinal cutting edges and face cutting edges are formed, wherein a cylindrical longitudinal support surface is formed behind the first cutting tooth in the working direction of rotation and the other cylindrical longitudinal support surface is formed in front of the last cutting tooth in the working direction of rotation, characterized in that at the first cutting tooth (4) the distance (L1) of the intersection point (P1), i.e. the longitudinal cutting edge (9) and the inclined cutting edge (10), from the face plane (π) is smallest and at the last cutting tooth (4'') the distance (L1'') of the intersection point (P1'')that is, the longitudinal cutting edge (9'') and the inclined cutting edge (10'') are greatest from the face plane (π), and at least one cutting tooth (4') is formed between the cutting teeth (4) and (4'') with a distance (L1') of the intersection point (P1'), i.e., the longitudinal cutting edge (9') and the inclined cutting edge (10'), from the face plane (π), wherein, for individual cutting teeth (4') and (4), the distances (L1') and (L1) of the intersection points (P1') and (P1) from the face plane (π) decrease from the distance (L1'') in the working direction of rotation, and the distances (L2) and (L2') between the face plane (π) and the intersection points (P2) and (P2'), i.e., the cylindrical longitudinal support surfaces (6) and (6') and the lead-in surfaces (5) and (5'), decrease by at least 0.2 mm as the distance (L1'') between the frontal plane (π) and the intersection point (P1'') are larger.

The invention relates to the technical field of compressors, in particular to high-performance nodular cast iron for a reciprocating piston type compressor unit and a smelting technology of the high-performance nodular cast iron. The high-performance nodular cast iron for the reciprocating piston type compressor unit comprises the following chemical elements in percentage by weight: 3.2-3.6 wt% of C; 2.4 to 2.9 wt% of Si; 0.3 to 0.4 wt% of Mn; p is less than or equal to 0.05 wt%; s is less than or equal to 0.03 wt%; 0.03 to 0.06 wt% of Mg; 0.01 to 0.05 wt% of a rare earth metal; ti is less than or equal to 0.04 wt%; less than or equal to 0.03 wt% of Sb; 0.3 to 0.6 wt% of Cu and Ni; and the balance of iron and inevitable impurities. On the basis of traditional QT450-10 nodular cast iron, nickel and copper elements are introduced, the mechanical performance of the nodular cast iron is improved, and a manufactured compression cylinder product meets the requirements of application scenes with higher requirements for the compression cylinder.

The application provides an outer wall protection device for a socket metal pipe, the outer wall protection device is a ring segment with the same center as the socket metal pipe to be protected, a hollow cylinder is formed by more than two ring segments, the socket metal pipe is sleeved in the hollow cylinder, the outer diameter of the hollow cylinder is greater than or equal to the outer diameter of the pushing flange and smaller than the maximum diameter of the socket segment sleeved in the hollow cylinder; the outer wall protection device comprises a first ring segment and a third ring segment; the first ring segment is adjacent to the reinforcing support during installation, and the third ring segment is matched with the socket segment. The application eliminates the longest curing process in the production of nodular cast iron pipes, shortens the pouring link in the preparation process of the nodular cast iron pipes, forms the required structure of the outer wall and the socket metal pipe in stages, and thus improves the production efficiency of the metal pipe.

The utility model discloses a high temperature setting device for nodular cast iron profile production, which comprises a fixed cooling plate, the fixed cooling plate is composed of three planes which are mutually vertical in pairs, the bottom surface of the fixed cooling plate is provided with a bottom cooling pipeline, and the side wall of the fixed cooling plate is provided with a side wall fixed cooling pipeline; a movable cooling plate is movably arranged on the diagonal side of the fixed cooling plate, the movable cooling plate is composed of two planes perpendicular to each other, and a side wall movable cooling pipeline is arranged on the movable cooling plate; and a variable rectangular cooling area can be formed between the movable cooling plate and the fixed cooling plate and is used for cooling and shaping the profile mold. According to the utility model, the cooling area is adjustable and can be adapted to different molds; meanwhile, thermal expansion and cold contraction exist in the mold cooling process, and when the profile mold is subjected to thermal expansion or cold contraction, the pressing screw can be adjusted, so that the cooling plate is attached to the profile mold, and the cooling effect is improved.

The invention provides microalloyed high-modulus high-strength nodular cast iron which comprises the following components: 2.8-3.0% of C, 4.0-4.3% of Si, 0.3-0.5% of Mn, 0.7-1.0% of Cr, 0.5-0.6% of Mo, 1.2-1.5% of Ni, 0.8-0.9% of Cu, 0.1-0.3% of V, 0.01-0.05% of Re, less than or equal to 0.03% of S, less than or equal to 0.05% of P and the balance of iron, and (Ni + Cu) / (Cr + V) is more than or equal to 2.0 and less than or equal to 2.5. The nodular cast iron still keeps the tensile strength larger than or equal to 88 MPa and the high modulus characteristic at the high temperature of 820 DEG C. The material has the advantages of being low in alloy cost, stable in high-temperature performance and good in structural rigidity, and is suitable for high-temperature heat-resistant components such as engine exhaust manifolds under the national sixth emission standard, and the invention further provides a preparation method of the microalloyed high-modulus and high-strength nodular cast iron.

The utility model discloses an auxiliary device for butt joint of bell and spigot joints of nodular cast iron pipes, which relates to the technical field of cart handles and comprises fixing clamps, the fixing clamps are symmetrically arranged, chains are movably connected to the tops and the bottoms of the fixing clamps, and a group of symmetrical guide rails are fixedly connected to opposite sides of the fixing clamps. Sliding mechanisms are arranged on the opposite sides of the fixing clamps, bearing mechanisms are arranged at the tops of the sliding mechanisms, rotating rods are rotatably connected to the bottoms of the sliding blocks, driving mechanisms are fixedly connected to the tops of the bearing mechanisms and the sliding mechanisms, and check blocks are slidably connected to the corners of the bottoms of the sliding mechanisms. According to the utility model, the bearing mechanism, the adjusting rod and the inclined surface are in threaded transmission fit, manual rotation is converted into vertical fine adjustment of the lifting block, and low-friction rolling of the rolling ball is combined, so that the pipeline axis is quickly aligned with the original bell and spigot, and the problem of time consumption caused by repeated trial and adjustment of traditional manual heightening is solved.

The application belongs to the technical field of nodular cast iron smelting, and particularly relates to a nodular cast iron smelting equipment and a use method thereof, which comprises a base, a heating table, a support frame, a cover package type spheroidizing mechanism and a heat sensing type slag cleaning mechanism. The heating table is arranged on the upper wall of the base. The support frame is symmetrically arranged on the upper wall of both ends of the base. The cover package type spheroidizing mechanism is arranged on the support frame. The heat sensing type slag cleaning mechanism is arranged on the base. The cover package type spheroidizing mechanism comprises a sealing package assembly and a heat preservation assembly. The sealing package assembly is arranged on the end of the support frame away from the base. The heat preservation assembly is arranged on the inner wall of the heating table. The heat sensing type slag cleaning mechanism comprises a heat measuring assembly, a ring guide assembly, an energy storage assembly and a slag vibrating assembly. The nodular cast iron smelting equipment and the use method thereof can timely remove the molten slag adhered to the inner wall of the cover plate and recycle the heat generated during the spheroidizing process of the molten iron.

A ductile cast iron water supply pipe inner wall coating heat treatment device, including a supporting roller and two heating devices, the supporting roller is provided with at least two and is arranged on the ground in parallel, each supporting roller includes a roller frame and at least two rotating rollers for supporting the ductile cast iron water supply pipe, one of the supporting rollers is provided with a rotating drive device to drive one of the rotating rollers on the supporting roller to rotate, the ductile cast iron water supply pipe is placed on the rotating rollers of the supporting roller, and the two heating devices are respectively arranged in the horizontal direction and are arranged at the two ends of the ductile cast iron water supply pipe, the heating device can be inserted into the ductile cast iron water supply pipe from the two ends of the ductile cast iron water supply pipe and can move and heat while heat treating the inner wall coating of the ductile cast iron water supply pipe. The device realizes accurate heating of the coating by arranging the horizontally movable heating devices at the two ends of the water supply pipe, and avoids the problems of local overheating or underheating caused by poor heat control in the traditional overall heating mode.

The utility model provides a nodular cast iron industrial robot rotating base mold casting structure which comprises an outer mold plate, a sand mold, a wax mold and a hole separating block, the outer mold plate is an outer layer shroud ring structure of a mold, the sand mold is arranged in the outer mold plate and provided with a forming cavity, the forming cavity is a molten iron casting solidification space, and the wax mold is arranged in the outer mold plate. The forming cavity is filled with a wax mold in a matched mode, a forming hole of the wax mold is connected with a hole separating block in a filling mode, the hole separating block is embedded into sand molds connected to the two sides of the forming cavity, a casting runner is formed in each sand mold, the tail end of each casting runner is connected with the forming cavity through the bottom of the mold, and the flowing tail end of the forming cavity is further connected with an exhaust structure. The exhaust structure is formed in the sand mold and extends upwards. The outer mold plate is used for fixing the sand mold, expansion deformation of the sand mold can be avoided, the wax mold is used for supporting the space in the forming cavity, the forming precision of the forming cavity can be maintained, forming defects are reduced, and the product quality is improved.

Provided are: a method for producing a mold-cast product of spheroidal graphite cast iron having ultra-fine spheroidal graphite cast iron, which is capable of producing ultra-fine spheroidal graphite cast iron in a simple manner with good reproducibility; and a spheroidizing agent. Provided are a sand mold manufacturing method and a spheroidizing agent with which it is possible to manufacture ultra-fine spheroidal graphite cast iron with good reproducibility even for thin-walled spheroidal graphite cast iron which is a sand mold having the same solidification and cooling conditions as a mold. A method for producing a mold cast product of spheroidal graphite cast iron, the method comprising a melting step, a spheroidizing step, an inoculation step, and a casting step, in which the spheroidizing is performed using a spheroidizing agent in which the content of C is 0.5% (mass) or more, the content of total nitrogen N is 150 ppm (mass) or less, and the content of N. The amount of nitrogen generated during melting is 15 ppm (mass) or less.

This invention belongs to the field of die casting technology, specifically relating to a high-performance Fe-based laser cladding treatment method for the surface of a ductile iron die casting machine template. The method includes the following steps: selecting a substrate and a metal powder to be laser clad; the substrate is a QT500-7 ductile iron die casting machine template, and the metal powder is Fe60 alloy powder; setting parameters for the laser cladding system, including laser power, scanning speed, spot diameter, defocusing amount, powder feeding speed, and overlap rate; performing cladding; and selecting a corresponding tempering process based on the actual service conditions of the QT500-7 ductile iron die casting machine template. This invention, for QT500-7 ductile iron, uses lower-cost Fe-based alloy powder to replace expensive Ni-based alloy powder, and after tempering, the cladding layer exhibits excellent comprehensive performance, with a bonding strength close to that of the substrate and excellent corrosion resistance, significantly reducing the remanufacturing cost of the die casting machine template.

According to the high-silicon solid solution nodular cast iron material with the high welding performance, the content of Si is controlled to be 3.7-4.2%, the content of Cu is controlled to be 0.15-0.45%, the high-temperature brittleness of the material is effectively reduced, and the high-temperature tensile strength of the material is improved. When the high-welding-performance high-silicon solid solution nodular cast iron material is used for welding, cracks do not appear in a welding seam heat affected zone on the cast iron side after welding, the welding rejection rate can be reduced, the part welding quality is improved, and the machining cost is reduced.

This invention discloses a pre-assembled porous reaction vessel for ductile iron production and its spheroidizing treatment method, belonging to the field of casting technology. The reaction vessel includes a covered hollow structure made of high-temperature resistant metal sheet, with multiple through-holes for pressure relief in its walls. The internal chamber is filled along its height with a pre-compacted multi-layer metallurgical filler, including at least a spheroidizing agent layer and an inoculant layer. This invention also discloses a spheroidizing treatment method based on this vessel. This invention ensures precise ingredient mixing through factory pre-assembly, achieves physical pressure relief and explosion prevention through the porous structure, and pre-sets the temporal and spatial sequence of the reaction through the multi-layer filler, achieving a stable, continuous, and high-absorption spheroidizing reaction. This invention completely eliminates the safety risks of manual operation, requires no expensive equipment investment, and has significant economic and social benefits.

1. The name of the design product: combined spigot for short top pipe. 2. The use of the design product: used for making the interface of the spigot for assembling the short top pipe of nodular cast iron. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

The invention discloses a nodular cast iron material with a thick and large section and a preparation method thereof. The nodular cast iron material is mainly prepared from the following raw materials: 35-50% of pig iron, 30-50% of scrap steel and 0-30% of foundry returns. And the carburant accounts for 0.45%-0.9% of the total amount of the pig iron, the scrap steel and the foundry returns. According to the technical scheme, on one hand, the silicon content is increased, and on the other hand, all alloy elements in the molten iron are subjected to specific proportion regulation and control, such as carbon (C), manganese (Mn) and other main elements and magnesium (Mg) auxiliary elements; through the adjustment, the nodular cast iron material with the thick and large section has good basic mechanical properties, the prepared as-cast nodular cast iron with the thick and large section is ferrite nodular cast iron, the tensile strength Rm of the as-cast nodular cast iron is larger than or equal to 650 MPa, the Rp yield strength is larger than or equal to 500 MPa, and the elongation A is larger than or equal to 7%.

The invention relates to the technical field of black metal heat treatment, and discloses a structure modification strengthening process of a carbon fiber induced high-damping nodular iron casting, which comprises the following steps: austenitizing and preserving heat of the nodular iron casting with pre-buried directionally distributed carbon fiber bundles in a controlled carbon potential environment, so that a matrix forms a carbon concentration gradient field; quenching to be close to a martensite transformation starting point; intermittent spray cooling is executed through a cooling control unit in a martensite phase transformation interval; according to the method, martensite laths are induced to radially and directionally grow at an interface by utilizing a pulsating heat flow field generated by utilizing the axial high heat conduction characteristic of the carbon fibers, and a radial grain boundary structure with the carbon fibers as the axis is constructed, so that interface internal friction is generated by utilizing the radial grain boundary structure when a casting bears an excitation load, and vibration energy is dissipated; and the nodular iron casting generates damping response on the premise of maintaining the hardness of a matrix, and stress concentration at a heterogeneous interface is eliminated.

The invention relates to the technical field of full mold casting, and provides a casting method of a large-scale automobile covering part GGG70L nodular cast iron stamping die, which comprises the following steps: firstly, manufacturing a model, and then manufacturing conformal chillers according to the molded surface of the model, and arranging the conformal chillers in a large area; smelting molten iron, adding alloy raw materials, and regulating and controlling the proportion of the alloy raw materials; then molten iron is subjected to spheroidizing inoculation and then is poured, after pouring, cooling in the eutectic stage is accelerated through external forced blowing heat dissipation, and through large-area use of shape-following chilling blocks, the profile cooling speed in the eutectic cooling stage is increased, the graphitization reaction is remarkably inhibited, growth of carburizing body nucleation and pearlite is promoted, and the pearlite nucleation rate is remarkably increased; ferrite precipitation is inhibited, and finally the pearlite content in a molded surface area is stabilized to be 90% or above; and finally, cooling to 200 DEG C, opening the sand box, taking down the test bar on the casting, and carrying out stretching detection and metallographic inspection. And multi-dimensional cooperative regulation and control are realized, so that the pearlite content is greatly increased, and the balance of mechanical properties is realized.

The invention discloses a method for preparing a high-performance rare earth magnesium-silicon-iron alloy through cooperation of pulsed magnetic field treatment and multi-element microalloying, and belongs to the technical field of metallurgy. The method comprises the following steps: smelting ferrosilicon-based alloy liquid in a submerged arc furnace; the base liquid is thermally loaded into a medium-frequency induction furnace, trace elements such as Ba, Sr, Sb and Bi are added in a cored wire feeding mode, and electromagnetic stirring is conducted to achieve multi-element microalloying; the alloy liquid is heated and then subjected to pulsed magnetic field treatment, the parameters are as follows: the magnetic field intensity is 0.5-3.0 T, the pulse frequency is 5-30 Hz, and the treatment time is 5-20 minutes; then adding magnesium and nitrogen under pressure and stirring; and finally, casting and quickly cooling under the protection of nitrogen. The solidification structure is refined through the pulsed magnetic field, the yield of microelements is increased through core-spun yarn feeding, the magnesium oxide content is reduced through nitrogen protection in the whole process, segregation is restrained through rapid cooling, the magnesium oxide content in the prepared alloy is smaller than or equal to 6% of the magnesium content, the macrosegregation degree is smaller than or equal to 0.3, and the average grain size is smaller than or equal to 50 micrometers. The alloy prepared through the method is good in spheroidizing stability, uniform in structure, low in cost and suitable for production of high-end nodular iron castings.

The utility model relates to the technical field of pouring devices, in particular to a pouring system for producing annular nodular cast iron blanks by precoated sand horizontal parting, which comprises a pouring cup for feeding, a filter box is connected above the pouring cup, and a filter plate for filtering impurities in molten metal is connected onto the inner wall of the filter box; one side of the filter box is connected with a straight flow channel plate used for conveying molten metal, and a step channel used for smooth transition of the molten metal is formed in the straight flow channel plate. According to the pouring system for producing the annular nodular cast iron blank through precoated sand horizontal parting, when molten metal flows into the forming mold through the tangential inner pouring gate, the molten metal forms a rotational flow state, and turbulent flow air entrapment is reduced; by means of the stepped ladder way, molten metal is affected by gravity and evenly flows out of the liquid outlet, and the molten metal is in smooth transition.

The application discloses a kind of quick repair construction methods of nodular cast iron plug-in cross trench grate, comprising the following steps: S1, processing the length of water ditch suitable channel steel;S2, setting 4-6 elevation control piles and corresponding two by two;S3, elevation is measured and marked;S4, the channel steel groove is firmly fixed on concrete;S5, install nodular cast iron plug-in cross trench grate;S6, the reinforcement and side form installation of cross trench grate two sides are tied;S7, pouring concrete;S8, complete repair;The method reduces construction difficulty, reduces maintenance cost, can effectively improve the flatness, firmness of cross trench grate, improve the speed of construction, effectively reduce the damage rate in the process of operation and maintenance, more effectively reduce the difficulty of replacement after damage.

The present application relates to a kind of graphite morphology and spheroidization rate analysis system and method based on image processing, belong to the technical field of graphite morphology analysis. Including the following steps: S1, obtaining the two-dimensional metallographic image of the measured nodular cast iron;S2, the two-dimensional metallographic image is handled, to separate each graphite particle in image;S3, extract and calculate the multiple shape factor of each graphite particle, the shape factor at least includes roundness, convexity and sharpness;S4, based on the preset determination threshold, whether each graphite particle is qualified spherical graphite is comprehensively judged;S5, based on the area of qualified spherical graphite, the spheroidization rate of the measured nodular cast iron is calculated;S6, output analysis report containing the spheroidization rate. By the present application, the technical problem that single roundness is prone to misjudgment high-risk graphite in the prior art spheroidization rate analysis method is solved.

The utility model discloses a nodular cast iron pipeline welding machine cable interface protection device which comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are fixedly connected, the first connecting part is detachably connected to a welding machine cable interface, and the second connecting part is detachably connected to a cable quick plug. The cable quick plug protection device is compact in structure and convenient to install, firmly protects the cable quick plug from loosening when an operator pulls a cable by using a welding machine in daily life, ensures that the welding machine can normally work for a long time, and protects the personal safety of the operator of the welding machine.

The invention relates to the technical field of nodular cast iron production, and particularly discloses a high-strength and high-elongation nodular cast iron material and a preparation method thereof. Comprising the following raw materials in percentage by weight: 24%-26% of pig iron, 48%-52% of foundry returns, 0.2% of a pretreating agent, 3.1%-3.4% of carbon, 2.0%-2.8% of silicon, 0.05%-0.3% of manganese, 0.01%-0.05% of phosphorus, 0.005%-0.02% of sulfur, 0.4%-0.7% of copper, 0.001%-0.02% of tin, 0.1%-0.3% of nickel and the balance of waste steel. The nodular cast iron material prepared by the nodular cast iron formula and the preparation method provided by the invention has relatively high ductility and relatively high strength, relatively safe performance and relatively high use value.

The invention discloses a nodular cast iron casting cooling device which structurally comprises a buffer room, an opening and closing door, a cooling device, a ventilation top and an observation window, the opening and closing door is connected with the buffer room, the ventilation top and the buffer room are of an integrated structure, the observation window is installed on the side face of the buffer room, and the cooling device is located in the buffer room; the cooling device comprises a sealing door, a control set, an inclined door, a grabbing clamp, a bracket, a pre-placing plate, a cooling channel, a spraying set and a connecting pipe, the sealing door and the inclined door are installed at the head end and the tail end of the cooling channel correspondingly, self-adaptive supporting of the spherical casting is achieved through the supporting set, and by means of the gravity of the casting, a limiting frame slides downwards along a supporting frame and compresses a spring; in the process, a plurality of supporting balls can be self-adaptive to the ball contours to jointly form a concave point contact support, so that the rolling problem of the balls in the conveying and cooling process is avoided, the position of a casting on the bracket is ensured to be consistent, and subsequent uniform and symmetrical cooling treatment is facilitated.

The application discloses a cutting device for nodular cast iron polyethylene composite pipe production, which comprises a rack, a walking track, a cutting vehicle body, a supporting vehicle body and a moving driving mechanism. The rack is provided with a first supporting wheel for supporting a receiving section, a limiting stop wheel and a rotating driving mechanism; the cutting vehicle body and the supporting vehicle body are respectively provided with a second supporting wheel and a third supporting wheel for supporting a plug-in section. The cutting vehicle body is provided with a cutting mechanism. The rack, the cutting vehicle body and the supporting vehicle body are all provided with a pipe body positioning auxiliary mechanism, which comprises a first hinged shaft, a positioning rod, a positioning wheel, a supporting cylinder and a turnover driving assembly. The turnover driving assembly drives the positioning rod to switch between a clamping position and a supporting position: when clamping, the positioning wheel and the supporting wheel jointly clamp the pipe; when supporting, the supporting cylinder lifts the pipe to separate the pipe from the supporting wheel, facilitating axial movement. The application can efficiently and accurately cut the pipe, protect the outer wall of the pipe and the inner lining composite layer, and meet the production requirements of non-standard length pipes.

A casting mold structure of indirect chillers of a thick and large-section as-cast nodular iron casting is characterized in that the structure comprises a casting mold cavity formed by casting molding sand, the casting mold cavity is provided with a plurality of outer surfaces, and a plurality of indirect chillers are arranged on the corresponding sides of the outer surfaces at intervals; molding sand layers are filled between the indirect chillers and the casting cavity and between the multiple indirect chillers. The utility model discloses a casting mold structure of an indirect chilling block. The casting mold structure for the thick and large-section as-cast nodular iron casting has the advantage that the casting defect of a direct chilling block is effectively overcome due to the arrangement of the indirect chilling block.