One: What is the parallel line of the projection surface? What is the projection of the line?
A: When the line is parallel to the projection surface, it is called the parallel line of the projection surface. The projection of this line is authentic.
Two: Any metal sheet has a thickness, and the thickness of the sheet has an influence on the shape and size of the figure?
A: It has an influence on the shape and size of the expanded map.
Three: What are the surfaces of the sphere, the ring and the spiral surface?
A: The surface is a non-expandable surface.
Four: What is the general deployment method for the development of prisms and cylinders?
A: The parallel line expansion method is generally applied.
Five: The conical tube and the cylindrical tube are orthogonally intersected. What method is used to find the intersecting line?
A: It is often obtained by the auxiliary plane method.
Six: Which method is used to find the actual length of the curve?
A: Multi-purpose expansion method.
Seven: When the friction press is overloaded, it will only cause sliding between what and what, without damaging the machine?
A: It will only cause the flywheel to slide between the friction discs without damaging the parts.
Eight: The stroke of the open crank press slider can be adjusted by changing what and what?
A: It can be adjusted by changing the eccentric sleeve on the upper part of the connecting rod; the center distance of the main shaft.
Nine: In the deep drawing and extrusion process, what are the requirements for the material due to the gap of the mold ?
A: The thickness tolerance of the material is stricter.
Ten: Which three stages can the separation process of the sheet material be divided into during the blanking?
Answer: 1: elastic deformation, 2: plastic deformation, 3: crack separation.
Eleven: The more the drawing coefficient, the greater the degree of material deformation.
A: The smaller the drawing coefficient, the greater the degree of material deformation.
Twelve: What is cold stamping?
A: The stamping process performed at normal temperature is called cold stamping.
Thirteen: What is a compound process?
A: Combining two or more basic processes together in one stroke of the press is called a compound process.
Fourteen: What is a simple punching model?
A: In the one stroke of the press, only one punching die can be completed.
Fifteen: What is a composite punching die?
A: Under the one stroke of the press, the punching die of multiple processes can be completed at the same time.
Sixteen: How to explain the correction coefficient Kp?
Answer: When calculating the punching force, consider the wear of the die edge, the die gap, the mechanical properties of the material, etc., and select the safety factor. Under normal circumstances, take Kp equal to 13.
Seventeen: What is the oblique cutting edge?
A: The oblique edge punching is a way to reduce the punching force. That is, the die edge is made inclined at an angle with respect to the blank, so that the contact of the die edge with the blank during the punching is gradual, so that the load is uniform and stable.
Eighteen: What is a stepped punch punch?
A: Stepped punch punching is a way to reduce the punching force. When punching at the same time, the punch is made into a stepped form with respect to the height of the blank, and the punching force can be effectively dispersed during punching.
Nineteen: What is the difference between an open crank press and a closed crank press?
Answer: In terms of structure, the bed of the open crank press has a C-shaped structure, and the connecting rod converts the rotary motion of the partial mandrel into the up and down reciprocating motion of the slider. The bed of the closed press is frame-shaped and the eccentric shaft is replaced by a crank.
Twenty: What are the characteristics of the open crank press and the closed crank press?
A: The C-shaped bed of the open crank press is open on three sides, which is especially suitable for the stamping of the edge of large sheets. However, this form of bed structure itself is less rigid and thus can withstand less load. The frame structure of the closed crank press is limited by the column, the worktable area is limited, and the operation space is small, so there is a certain limit on the peripheral size of the stamping part. The frame-shaped structure bed is rigid and the load it receives is large and uniform.
Twenty-one: What are the factors that affect material stamping?
A: There are (1) elastic (2) plasticity (3) hardness (4) surface quality of the material (5) material thickness tolerance.
Twenty-two: What effect does the mold gap have on the punching quality?
Answer: The gap between the convex and concave molds is too small, and the crack of the material near the edge of the punch is shifted outward by a distance, so that the part of the material between the upper and lower lines is cut a second time with the punching. Affected the quality of the section. When the gap is too large, the crack of the material near the edge of the punch is offset by a distance, the material is greatly stretched, the burr of the edge of the material, the sag angle and the slope are large, and the cross-section quality of the blank is also affected. In addition, the gap is too small or too large, which has a certain influence on the dimensional deviation of the blank.
Twenty-three: What are the factors that affect the minimum bending radius of materials?
Answer: 1: Mechanical properties and heat treatment state of the material, 2: bending angle of the workpiece, 3: geometry and size of the material, 4: bending direction, 5: other aspects, such as the thickness of the material, the quality of the surface and the side.
Twenty-four: How is the neutral layer of the material defined during bending?
Answer: During the bending process, the outer layer is stretched and the inner layer is squeezed. There must be a transition layer on both sides of the section that is neither untensioned nor pressed. The stress is almost equal to zero. This transition layer is called The neutral layer of the material.
Twenty-five: When correcting the components composed of multiple beams and columns, what is the relationship between them?
A: We must fully consider the relationship between beams and columns.
Twenty-six: When correcting the deformation of a thin plate in a steel structure, what must be guaranteed?
A: It is necessary to ensure that all types of frames meet the requirements before they can be considered for correction.
Twenty-seven: What is the heating point of the spot heating related to the plate? What is the distance between the heating points?
A: The heating point of point heating is related to the thickness of the board. The distance between the heating points should be uniform.
Twenty-eight: What is called vertical contraction?
A: One form of metal shrinkage near welds and welds, shrinkage along the length of the weld, is called longitudinal shrinkage.
Twenty-nine: What is called lateral contraction?
Answer: A form of metal shrinkage near welds and welds refers to shrinkage perpendicular to the length of the weld, said lateral contraction.
Thirty: How is the internal stress in the steel structure produced?
Answer: The welding process is an uneven heating and cooling process for the rivet welded structure, which is the main reason for the internal stress in the rivet welded structural parts. In addition, each part of the steel structural member may have residual stress after it is in the state of the blank or processed into a part. After the welding is integrated, these residual stresses may be aggregated into new internal stress of the component.
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ANSI Flanges refer to ASME/ANSI B16.5 -Flanges and Flanged Fittings. It is the ASME B16.5 – 1996 Pipe Flanges and Flange Fittings standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings.
Designations class: 150, 300, 400, 600, 900, 1500, and 2500
Size Range : 1/2″ to 80″
Stainless steel: ASTM A182 F304/ 304L/ 304H/ 316/ 316L/ 317/ 317L/ 321/ 310/ 347/904L/ etc;
Carbon steel: ASTM A105/A105N/A694F42/46/52/56/60/65/ 70 / A350 LF3/ A350 LF2,ST37.2, S235JR, C22.8, Q235, P250GH, RST37.2 etc.
Alloy steel: ASTM A182 F1/ F5/ F9/ F11/ F22/ F91/ etc.
Others:Monel, Nickel, Inconel, Hastalloy, Copper, Brass, Bronze, Titanium, Tantalum, Bismuth, Aluminium, High Speed Steel, Zinc, Lead, etc
Material:
Types
ANSI Flanges,ANSI B16.47 Flanges,ANSI Carbon Steel Flanges,B16.5 Flange
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