A tinplate cross-cutting shear and adjustment method

Abstract

The invention relates to a tinplate cross-cutting shear. A reasonable shearing overlap is set to minimize the wear of a linear bearing of a cutter die and upper and lower blades during high-speed shearing of the tinplate, thereby extending the service life of the cutter die. In an adjustment method, the distances between an upper cutter holder and a lower cutter holder along the x and y directions are measured respectively, a parallelism deviation value is calculated by a mathematical method, and the flatness of the upper cutter holder is adjusted and corrected mechanically, with the error controlled within 0.02 mm. A new linear bearing is developed so that the bearing can slide linearly and rotate 360 ​​degrees at the same time, and can store oil and self-lubricate, thereby reducing maintenance costs.

Description

Technical Field

[0001] The present invention relates to a cross-cutting shear, in particular to a tinplate cross-cutting shear, which extends the service life of the tinplate cross-cutting shear die and is used in the finishing production line of a cold rolling mill to shear tinplate coils into tinplate specifications (0.17mm-0.55mm) required by users, belonging to the technical field of cold rolling machinery. Background Art

[0002] The cold rolling mill's shearing line is used to shear incoming tinplate coils into finished plates meeting customer specifications and technical requirements, followed by sorting, testing, stacking, and packaging. The maximum shearing speed is 250 sheets per minute. Tinplate is used in beverage and food cans, placing extremely high demands on strip shearing quality, particularly burr removal. Burrs on the steel plate must be kept within 0.015mm to meet these requirements.

[0003] Domestically advanced tinplate shearing machines are all imported three-column down-punch stop-shear complete shearing machines. Under normal circumstances, a pair of imported new blades can theoretically process less than 100,000 tons of steel and ensure that the shearing burrs of tinplate are ≤15μm. During the production process, the main reasons for the excessive burrs on the sheared edges of strip steel are:

[0004] 1. The blades in the die of the cross-cut shears have become blunt, resulting in burrs exceeding 15μm on the sheared edge or on the sheared edge. There are several possible causes for this: ① Normal shear wear, resulting from a steel throughput exceeding 100,000 tons; ② Excessive clearance between the four linear bearings in the die, resulting in abnormal wear on the upper and lower blades; ③ Excessive overlap between the upper and lower blades of the cross-cut shears, leading to rapid wear of the blades.

[0005] 2. The gaps between the four linear bearings in the die of the cross-cut shears are large, resulting in a large gap between the upper and lower blades and excessive shear burrs. There are several reasons for the large gaps between the linear bearings: ① During the shearing process, the bearings wear normally, with sliding friction exceeding 1 million times; ② The flatness deviation of the upper and lower tool holders of the cross-cut shears is large, resulting in directional wear of the four linear bearings in the die, causing the gaps between the linear bearings to increase; ③ The four linear bearings in the die are lacking oil. During high-speed punching and shearing, the bearings wear very quickly, resulting in large gaps between the linear bearings.

[0006] Currently, a set of imported new blades for advanced domestic tinplate shearing units typically handles approximately 20,000 tons of steel and costs 210,000 yuan per set. Blade consumption is the highest maintenance expense for the unit. Generally, when the cross-cutting shear die handles 20,000 tons or more or when shear burrs exceed the specified limit, the die must be replaced. The offline die must be repaired and kept in reserve. The repaired blade handles approximately 5,000 tons of steel. When the die handles less than 5,000 tons of steel, the shears' tool holder must be disassembled and overhauled, requiring at least five days of repair. Domestically designed tinplate shearing units operate at lower speeds, with a maximum punching and shearing speed of 120 sheets per minute. The die handles generally ≤5,000 tons of steel, and the blades cost 100,000 yuan per set. Shearing quality is also primarily ensured through die replacement and overhaul. Therefore, the units urgently need a method to extend the service life of the tinplate cross-cutting shear die to reduce maintenance costs.

[0007] A search revealed that the specification for Chinese patent CN100480007C, "Method for Making a Cross-Cutting Die," describes a method for making a cross-cutting die. The problem to be solved is improving the accuracy and strength of the blade connection position and increasing the service life of the die. However, there are no measurement and adjustment steps and methods related to the blade holder and overlap in shearing production lines, nor is there any actual application data for linear bearings in cross-cutting scissor dies for tinplate. The specification for Chinese patent CN201105340Y, "A Straight Cutting Die," describes a straight cutting die comprising a die body, an upper blade holder, a blade mounted on the upper blade holder, a lower blade holder, a blade mounted on the lower blade holder, an inlet guide plate, and an outlet guide plate. The inlet end of the inlet guide plate is chamfered, and the front end of the outlet guide plate is chamfered. This prevents scratches on the strip caused by the spring blade holder, ensures the surface quality of the strip, and prevents potential collisions between the strip and the blade. However, there are no measurement and adjustment steps and methods related to the blade holder and overlap in shearing production lines, nor is there any actual application data for linear bearings in cross-cutting scissor dies for tinplate. Summary of the Invention

[0008] The present invention is aimed at the problems existing in the prior art and provides a tinplate cross-cutting shear. The technical solution provides a method for extending the service life of the tinplate cross-cutting shear die. The idea of ​​the present invention is: respectively measure the distance between the upper tool holder and the lower tool holder along the x and y directions, calculate the parallelism deviation value by mathematical methods, and use mechanical methods to adjust and correct the flatness of the upper tool holder, and control the error within 0.02mm; develop new linear bearings so that the bearings can slide linearly and rotate 360° at the same time, and can store oil and self-lubricate; set a reasonable shear overlap so that the wear of the cutter die linear bearings and the upper and lower blades is minimized during the high-speed shearing of tinplate, thereby extending the service life of the cutter die.

[0009] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a tinplate cross-cutting shear comprises an upper knife holder, a lower knife holder, a knife die, an upper pneumatic clamp, a lower pneumatic clamp and an overlap adjustment mechanism. The knife die comprises an upper knife die, a lower knife die, an upper blade, a lower blade and a linear bearing three-piece set, wherein the upper blade is installed in the upper knife die, and the lower blade is installed in the lower knife die. The linear bearing is connected to the guide shaft keyway through a stop bolt and can slide up and down in the guide sleeve. The upper knife die is fixed to the upper knife holder through an upper pneumatic clamp, and the lower knife die is fixed to the lower knife holder through a lower pneumatic clamp. The lower knife holder is integrally fixed horizontally with the base, the upper knife holder is connected to the slider and is driven by the transmission mechanism to move along the slide groove, and only performs up and down shearing movement. There is a connecting column between the upper knife holder and the slide groove. There are three connecting columns in total, two of which are located on the operating side and the other is located on the transmission side. There is a set of identical worm gear mechanisms inside the connecting column and a locking cap outside.

[0010] As an improvement to the present invention, the overlap adjustment mechanism includes a main shaft, two main gears, and six sub-gears. The two main gears are mounted on the operating side and the transmission side of the main shaft, respectively. The three sub-gears are connected to the worms in the three columns. When the main shaft is manually rotated, the gear pair consisting of the two main gears and the six sub-gears drives the three worms to rotate synchronously. When the worms rotate, the worm gear screw drives the upper tool holder to move up and down synchronously. The entire upper tool holder can move up and down synchronously.

[0011] As an improvement to the present invention, a three-piece linear bearing assembly includes a linear bearing, a guide shaft, and a guide sleeve. The guide shaft is mounted in the upper die, and the guide sleeve is mounted in the lower die. The linear bearing is connected to the guide shaft keyway via a stop bolt and slides up and down within the guide sleeve. The linear bearing is connected to the guide shaft keyway via the stop bolt and can slide up and down within the guide sleeve while also being able to rotate 360° on the guide shaft (slider).

[0012] As an improvement of the present invention, a circumferential groove is provided inside the linear bearing, a slider is provided inside the linear bearing and can slide along the groove, and a stop bolt is provided in the middle of the slider.

[0013] As an improvement of the present invention, a circular groove 38 with a diameter of 0.2 mm is opened on the upper and lower edges of the internal circumferential groove of the linear bearing. The capillary working principle is used to absorb oil, and the groove can store a small amount of lubricating oil.

[0014] As an improvement of the present invention, a spring is installed on the guide shaft between the linear bearing and the upper cutting die, which is used to reduce the up and down sliding distance of the linear bearing when the upper tool holder moves in shearing motion.

[0015] A method for adjusting the flatness of a tool holder by cross-cutting shears, the method comprising the following steps:

[0016] Step 1: Pull out the die, loosen the three connecting column locks and caps, let the upper tool holder be in a free state, and draw a straight line along the x and y directions on the lower tool holder;

[0017] Step 2: Use an internal micrometer or other precision instrument to measure the vertical distance h between the upper and lower tool holders along the straight line. x1 , h x2 , h y1 , h y2 .

[0018] Use mathematical methods to calculate the parallelism deviation value △h of the upper tool holder along the x direction x , which can be expressed as:

[0019] △h x =h x1 -h x2 (1)

[0020] Use mathematical methods to calculate the parallelism deviation value △h of the upper tool holder along the y direction y , which can be expressed as:

[0021] △h y =h y1 -h y2 (2)

[0022] Step 3: First remove the outer cover of the overlap adjustment mechanism, then remove the main gear on the working side, so that when the secondary gear is rotated, only the worm gear in one column on the working side is driven to rotate. Assuming the worm gear ratio is u and the worm gear pitch is p, then the axial displacement s of the worm gear can be expressed as:

[0023]

[0024] in, is the arc of rotation of the pinion ( is the number of circles);

[0025] To level and correct the upper tool holder along the x direction, the worm gear screw displacement in the column needs to be △h x , that is, s = △h x , put it into formula (3), and it becomes:

[0026]

[0027] Manual rotation of the pinion After the circle, the upper tool holder can be leveled and corrected along the x direction, where △h x When it is positive, is clockwise; △h x When it is a negative value, is counterclockwise,

[0028] Step 4: Assume that the number of teeth on the main gear is Z1, the number of teeth on the secondary gear is Z2, the gear ratio of the worm is u, and the pitch of the worm screw is p. Then, the axial displacement s′ of the worm screw can be expressed as:

[0029]

[0030] To level and correct the upper tool holder in the y direction, the worm gear screw displacement in the transmission side column needs to be △h y , that is, s′=△h y , put it into formula (5), and it becomes:

[0031]

[0032] Manually rotate the spindle After the circle, the upper tool holder can be leveled and corrected along the y direction. y When it is positive, is counterclockwise; △h y When it is a negative value, In clockwise direction.

[0033] The method for adjusting the overlap amount of upper and lower blades of a cross-cutting shear comprises the following steps:

[0034] Manually turning the overlap adjustment device's main shaft drives the worm gear mechanism inside the three columns to rotate synchronously through the gear pair, which in turn causes the worm gear to move the upper tool holder up and down as a whole. The upper tool holder moves s' for each rotation of the main shaft. When switching between strip thickness specifications, adjust the overlap between the upper and lower blades to just cut the strip. The specific method is as follows:

[0035] Step 1: When the cross-cut shear can cut the strip, the spindle rotates counterclockwise one circle each time until it can no longer cut. Then rotate the spindle clockwise 0.5 circle until it can cut the strip. If it still can no longer cut, rotate it clockwise 0.5 circle again.

[0036] Step 2: When the cross-cutting shear cannot cut the strip steel, the spindle rotates one circle clockwise each time until the strip steel can be cut. The spindle then rotates 0.5 circle counterclockwise to cut the strip steel. If it cannot be cut, rotate it 0.5 circle clockwise again to set the overlap of the upper and lower blades to the minimum with an accuracy ≥s′ / 2.

[0037] Compared with the prior art, the present invention has the following advantages: the technical solution proposes a method for extending the service life of the cross-cutting scissors die for tinplate with a specification of 0.17-0.55mm in the production of cold-rolled tinplate. The distance between the upper tool holder and the lower tool holder along the x and y directions is first measured respectively, and then the parallelism deviation value is calculated by mathematical methods. Then, the flatness of the upper tool holder is adjusted and corrected by mechanical methods, and the error is controlled within 0.02mm; a new linear bearing is developed so that the bearing can slide linearly and rotate 360° at the same time, and can store oil and self-lubricate; a reasonable shear overlap is set to minimize the wear of the linear bearing of the cutter die and the upper and lower blades during the high-speed shearing of the tinplate, thereby extending the service life of the cutter die, reducing maintenance costs and product scrap, and stabilizing the shearing quality of the tinplate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 、 Figure 2 Schematic diagram of the cross-cutting scissors frame.

[0039] Figure 3 Schematic diagram of the upper tool holder.

[0040] Figure 4 Schematic diagram of the lower tool holder.

[0041] Figure 5 、 Figure 6 Schematic diagram of the blade overlap adjustment mechanism.

[0042] Figure 7 Schematic diagram of a three-piece linear bearing set.

[0043] In the figure: 1-upper tool holder; 2-lower tool holder; 3-cutting die; 4-three-piece linear bearing set; 5-base; 6-working side column 1; 7-working side column 2; 8-transmission side column; 9-cover; 10-upper cutting die; 11-lower cutting die; 12-upper blade; 13-lower blade; 14-upper pneumatic clamp; 15-lower pneumatic clamp, 16-slider; 17-slide, 18-transmission mechanism; 19-locking cap; 20-spindle, 2 1-working side main gear; 22-transmission side main gear; 23-secondary gear 1; 24-secondary gear 2; 25-secondary gear 3; 26-secondary gear 4; 27-secondary gear 5; 28-secondary gear 6; 29-worm gear mechanism; 30-overlap adjustment mechanism; 31-linear bearing; 32-guide sleeve; 33-guide shaft; 34-spring; 35-slider; 36-stop bolt; 37-circumferential groove; 38-capillary ring groove. DETAILED DESCRIPTION

[0044] In order to deepen the understanding of the present invention, this embodiment is described in detail below with reference to the accompanying drawings.

[0045] Example 1: See Figure 1-Figure 7, a tinplate cross-cutting shear, the cross-cutting shear comprises an upper knife holder 1, a lower knife holder 2, a knife die 3, an upper pneumatic clamp 14, a lower pneumatic clamp 15 and an overlap adjustment mechanism 30, the knife die comprises an upper knife die 10, a lower knife die 11, an upper blade 12, a lower blade 13 and a linear bearing three-piece set 4, wherein the upper blade 1 is installed in the upper knife die 10, and the lower blade 13 is installed in the lower knife die 11. The linear bearing is connected to the guide shaft keyway by a stop bolt and can slide up and down in the guide sleeve. The upper knife die is fixed to the upper knife holder 1 by the upper pneumatic clamp 14, and the lower knife die is fixed to the lower knife holder by the lower pneumatic clamp 15. The lower knife holder is fixed to the base as a whole horizontally, the upper knife holder is connected to the slider and is driven by the transmission mechanism to move along the slide groove, and only performs up and down shearing movement. There is a connecting column between the upper knife holder and the slide groove. There are three connecting columns in total, two of which are located on the operating side and the other is located on the transmission side. There is a set of identical worm gear mechanisms in the connecting column and a locking cap on the outside. The overlap adjustment mechanism includes a main shaft 20, two main gears, and six secondary gears. The two main gears are mounted on the operating and transmission sides of the main shaft, respectively. The three secondary gears are connected to the worms in the three columns. When the main shaft is manually rotated, the gear pair consisting of the two main gears and the six secondary gears drives the three worms to rotate synchronously. The worms rotate, and the worm gear screw drives the upper tool holder to move up and down synchronously. The three-piece linear bearing set includes a linear bearing 31, a guide shaft, and a guide sleeve. The guide shaft is mounted in the upper cutting die, and the guide sleeve is mounted in the lower cutting die. The linear bearing is connected to the guide shaft keyway via a stop bolt and slides up and down within the guide sleeve. The linear bearing is connected to the keyway of the guide shaft 33 via a stop bolt 36 and can slide up and down within the guide sleeve 32. It can also rotate 360 ​​degrees on the guide shaft (slider 35). The linear bearing 31 has a circumferential groove 37 inside, and a slider 35 inside that slides along the groove. A stop bolt 36 is located in the center of the slider. The linear bearing's internal circumferential groove has a 0.2mm diameter annular groove 38 on each of its upper and lower edges. These grooves absorb oil using capillary action, retaining a small amount of lubricant. A spring 34 is mounted on the guide shaft, located between the linear bearing and the upper die, to minimize the vertical sliding distance of the linear bearing during the upper toolholder's shearing motion.

[0046] Installation and working process: Figure 1-5As shown, this embodiment is a tinplate cross-cutting shear, comprising: an upper tool holder 1, a lower tool holder 2, a cutting die 3, ten upper pneumatic clamps 14, six lower pneumatic clamps 15, an overlap adjustment mechanism 30 and a cover shell 9, wherein the cutting die comprises an upper cutting die 10, a lower cutting die 11, an upper blade 12, a lower blade 13, and four linear bearing three-piece sets 4, the guide shaft 33 of the upper blade and linear bearing three-piece set is installed in the upper cutting die, and the guide sleeve 32 of the lower blade and linear bearing three-piece set is installed in the lower cutting die, the linear bearing 31 is connected to the guide shaft keyway by a stop bolt 36 and can slide up and down in the guide sleeve, the upper cutting die is fixed to the upper tool holder by the upper pneumatic clamp 14, and the lower cutting die is fixed to the lower tool holder by the lower pneumatic clamp 15. The lower tool holder is fixed horizontally as a whole with the base 5, the upper tool holder is connected to the slider 16 and is driven by the transmission mechanism 18 to move along the slide 17, and only performs up and down shearing movements. Between the upper tool holder and the slide are the working side column 1 6, the working side column 2 7, and the transmission side column 8. There are three connecting columns in total, the working side column 1 6 and the working side column 2 7 are located on the operating side, and the transmission side column 8 is located on the transmission side. Each connecting column has a set of worm gear mechanism 29 inside and a locking cap 19 outside. The overlap adjustment mechanism includes a main shaft 20, two main working side main gears 21 and a transmission side main gear 22, and six sub-gears, namely sub-gear one 23; sub-gear two 24; sub-gear three 25; sub-gear four 26; sub-gear five 27; and sub-gear six 28. The two main gears are respectively installed on the operating side and the transmission side of the main shaft. There are three sub-gears, namely sub-gear three 25, sub-gear five 27, and sub-gear six 28, which are respectively connected to the worm gear in the column. When the main shaft is manually rotated, the three worm gears are driven to rotate synchronously through the gear pair. After the worm gear rotates, the worm gear screw drives the upper tool holder to move up and down.

[0047] Example 2: See Figure 1-Figure 7 , a method for adjusting the flatness of a tool holder, the steps of which are as follows:

[0048] Step 1: Pull out the cutting die 10, loosen the three column locking caps 19, let the upper tool holder be in a free state, and draw a straight line along the x and y directions on the lower tool holder.

[0049] Among them, x is the direction of the center line of the unit, y is the direction perpendicular to the center line of the unit, and the positive direction is from the operating side to the transmission side.

[0050] Step 2: Use an internal micrometer or other precision instrument to measure the vertical distance h between the upper and lower tool holders along the straight line. x1 , h x2 , h y1 , h y2 . Use mathematical methods to calculate the parallelism deviation value △h of the upper tool holder along the x direction x , which can be expressed as:

[0051] △h x =hx1 -h x2 (1)

[0052] Use mathematical methods to calculate the parallelism deviation value △h of the upper tool holder along the y direction y , which can be expressed as:

[0053] △h y =h y1 -h y2 (2)

[0054] Among them, h x1 The vertical distance between the upper and lower tool holders at the center line of the working side column 6 is 221.934mm.

[0055] h x2 The vertical distance between the upper and lower tool holders at the center line of column 7 on the working side is 221.762mm.

[0056] h y1 The vertical distance between the upper and lower tool holders at the center of the two columns on the working side is 221.920mm.

[0057] h y2 It is the vertical distance between the upper and lower tool holders at the center line of the transmission side column 8, which is measured to be 221.871mm.

[0058] Substituting the measured data into formulas (1) and (2) respectively, we can obtain:

[0059] △h x =0.172mm>0.02mm;

[0060] △h y =0.049mm>0.02mm

[0061] At this point, it can be determined that the upper tool holder is tilted in both the x and y directions.

[0062] Step 3: First, remove the outer cover 9 of the upper tool holder overlap adjustment mechanism, then remove the working-side main gear 21. When the secondary gear 27 rotates, only the worm gear in the working-side column 6 rotates. Given that the tooth ratio u of the worm gear 29 is 1:50 and the worm screw pitch p is 2 mm, the axial displacement s of the worm screw during lifting and lowering can be expressed as:

[0063]

[0064] in, is the radian of the worm rotation ( is the number of circles).

[0065] To level the upper tool holder along the x direction, the worm gear in the column 6 needs to be lifted and lowered by △h. x , that is, s = △hx , put it into formula (3), and it becomes:

[0066]

[0067] Among them, △h x When it is positive, is clockwise; △h x When it is a negative value, is counterclockwise. Substituting the numerical value, we can get:

[0068]

[0069] That is, after manually rotating the secondary gear 27 clockwise for 4.3 turns, the upper tool holder can be leveled and corrected along the x direction.

[0070] Step 4: Given that the number of teeth Z1 of the main gear 22 is 24, the number of teeth Z2 of the secondary gear 28 is 58, the tooth ratio u of the worm gear 29 is 1:50, and the worm screw pitch p is 2 mm, the axial displacement s′ of the worm screw can be expressed as:

[0071]

[0072] To level and calibrate the upper tool holder along the y direction, the lifting displacement of the worm screw in the transmission side column 8 must be △h. y , that is, s′=△h y , put it into formula (5), and it becomes:

[0073]

[0074] Among them, △h y When it is positive, is counterclockwise; △h y When it is a negative value, is in clockwise direction. Substituting the numerical value, we can get:

[0075]

[0076] That is, the upper tool holder can be leveled and corrected along the y direction by manually rotating the main shaft 20 counterclockwise for 0.5 turns.

[0077] Example 3: See Figure 1-Figure 7 A method for adjusting the overlap of upper and lower blades of a cross-cutting shear is as follows:

[0078] Manually rotate the main shaft 20, and the gear pair consisting of the working side main gear 21, the transmission side main gear 22, the sub-gear 1 23-, the sub-gear 24, the sub-gear 3 25-, the sub-gear 4 26, the sub-gear 5 27, and the sub-gear 6 28 drives the worm gear mechanism 29 in the three columns to rotate synchronously, so that the worm gear screw drives the upper tool holder to move up and down as a whole. Among them, the screw of the worm gear mechanism in the column 6 is reverse-toothed, and the screw of the worm gear mechanism in the working side column 2 7 and the transmission side column 8 is positive-toothed. When the main shaft rotates one circle counterclockwise, the upper tool holder rises as a whole; when the main shaft rotates one circle clockwise, the upper tool holder drops as a whole, and the displacement is s′. According to formula (5), it can be calculated that the overlap adjustment device main shaft 20 rotates one circle (i.e. ), the upper tool holder lifting displacement s′ is approximately:

[0079] s′=0.1mm

[0080] When switching the thickness of the strip, adjust the overlap of the upper and lower blades to just cut the strip. The specific method is as follows: 1. When the cross-cut shear can cut the strip, the spindle rotates counterclockwise for one circle each time until it can no longer be cut. Then rotate the spindle clockwise for 0.5 circles until it can cut the strip. If it can no longer be cut, rotate it clockwise for another 0.5 circles.

[0081] 2. When the cross-cutting shear cannot cut the strip steel, the spindle rotates clockwise for one circle each time until the strip steel can be cut. The spindle then rotates counterclockwise for 0.5 circles until the strip steel can be cut. If it cannot be cut, rotate clockwise for another 0.5 circles.

[0082] This method can set the overlap of the upper and lower blades to a minimum with an accuracy of ≥0.05mm.

[0083] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of protection of the claims of the present invention.

Claims

1. A tinplate cross-cutting shear, characterized in that: The cross-cut shear comprises an upper cutter holder, a lower cutter holder, a cutter die, an upper pneumatic clamp, a lower pneumatic clamp and an overlap adjustment mechanism. The cutter die comprises an upper cutter die, a lower cutter die, an upper blade, a lower blade and a linear bearing. The upper blade is installed in the upper cutter die, and the lower blade is installed in the lower cutter die. The upper cutter die is fixed to the upper cutter holder by an upper pneumatic clamp, and the lower cutter die is fixed to the lower cutter holder by a lower pneumatic clamp. The lower cutter holder is fixed to the base in a horizontal manner. The overlap adjustment mechanism includes a main shaft, two main gears, and six sub-gears. The two main gears are respectively mounted on the operating side and the transmission side of the main shaft. The three sub-gears are respectively connected to the worms in the three columns. When the main shaft is manually rotated, the gear pair consisting of the two main gears and the six sub-gears drives the three worms to rotate synchronously. After the worms rotate, the worm gear screw drives the upper tool holder to move up and down synchronously. The linear bearing three-piece set includes a linear bearing, a guide shaft and a guide sleeve. The guide shaft is installed in the upper die, and the guide sleeve is installed in the lower die. The linear bearing is connected to the guide shaft keyway through a stop bolt and slides up and down in the guide sleeve. There is a circumferential groove inside the linear bearing, and a slider inside it can slide along the groove, and there is a stop bolt in the middle of the slider; There is a 0.2mm diameter annular groove on the upper and lower sides of the internal circumferential groove of the linear bearing. The capillary working principle is used to absorb oil, and the groove can store a small amount of lubricating oil. A spring is installed on the guide shaft between the linear bearing and the upper die, which is used to reduce the up and down sliding distance of the linear bearing when the upper knife holder is shearing; The method for adjusting the flatness of the tool holder for cross-cutting shears includes the following steps: Step 1: Pull out the die, loosen the three connecting column locks and caps, let the upper tool holder be in a free state, and draw a straight line along the x and y directions on the lower tool holder; Step 2: Use an internal micrometer precision instrument to measure the vertical distance h between the upper and lower tool holders along the straight line. x1 , h x2 , h y1 , h y2 ; Use mathematical methods to calculate the parallelism deviation value △h of the upper tool holder along the x direction x , which can be expressed as: △h x =h x1 -h x2 (1) Use mathematical methods to calculate the parallelism deviation value △h of the upper tool holder along the y direction y , which can be expressed as: △h y =h y1 -h y2 (2) Step 3: First remove the outer cover of the overlap adjustment mechanism, then remove the main gear on the working side, so that when the secondary gear is rotated, only the worm gear in one column on the working side is driven to rotate. Assuming the worm gear ratio is u and the worm gear pitch is p, then the axial displacement s of the worm gear can be expressed as: Where φ is the radian of rotation of the pinion, and φ / 2π is the number of turns; To level and correct the upper tool holder along the x direction, the worm gear screw displacement in the column needs to be △h x , that is, s = △h x , put it into formula (3), and it becomes: That is, after manually rotating the secondary gear φ / 2π turns, the upper tool holder can be leveled and corrected along the x direction, where △h x When it is positive, φ is in clockwise direction; △h x When it is a negative value, φ is counterclockwise. Step 4: Assume that the number of teeth on the main gear is Z1, the number of teeth on the secondary gear is Z2, the gear ratio of the worm is u, and the pitch of the worm screw is p. Then, the axial displacement s′ of the worm screw can be expressed as: To level and correct the upper tool holder in the y direction, the worm gear screw displacement in the transmission side column needs to be △h y , that is, s′=△h y , put it into formula (5), and it becomes: That is, after manually rotating the spindle φ′ / 2π circles, the upper tool holder can be leveled and corrected along the y direction, where △h y When it is positive, φ is counterclockwise; △h y When it is a negative value, φ is in clockwise direction.

2. The tinplate cross-cutting shear according to claim 1, characterized in that: The method for adjusting the overlap of the upper and lower blades of the cross-cut shear is as follows: Step 1: When the cross-cut shear can cut the strip, the spindle rotates counterclockwise one circle each time until it can no longer cut. Then rotate the spindle clockwise 0.5 circle until it can cut the strip. If it still can no longer cut, rotate it clockwise 0.5 circle again. Step 2: When the cross-cutting shear cannot cut the strip steel, the spindle rotates one circle clockwise each time until the strip steel can be cut. The spindle then rotates 0.5 circle counterclockwise to cut the strip steel. If it cannot be cut, rotate it 0.5 circle clockwise again to set the overlap of the upper and lower blades to the minimum with an accuracy ≥s′ / 2.

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