CN113172450A - Clamping device for improving depth dimension precision of steel plate notch - Google Patents
Clamping device for improving depth dimension precision of steel plate notch Download PDFInfo
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- CN113172450A CN113172450A CN202110356532.9A CN202110356532A CN113172450A CN 113172450 A CN113172450 A CN 113172450A CN 202110356532 A CN202110356532 A CN 202110356532A CN 113172450 A CN113172450 A CN 113172450A
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- grooving
- pressing wheel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
Abstract
The invention discloses a clamping device for improving the depth dimension precision of a steel plate notch groove, wherein the central axis of a third cylinder of a pressing wheel is parallel to the central axis of an eighth cylindrical surface of a support table, the pressing wheel is positioned at the upper end of a notch groove steel plate, the two pressing wheels are respectively positioned at the left side and the right side of the notch groove part of the notch groove steel plate, and the third outer cylindrical surface of the pressing wheel is in contact with a first upper rectangular plane of the notch groove steel plate; the invention changes the free irregular warping of the thin-wall steel plate when being clamped into a forced fixed direction warping, greatly improves the bending-resistant section coefficient in the direction vertical to the axis of the cylindrical surface, and ensures that the steel plate is seamlessly attached to the generatrix at the uppermost end of the cylindrical surface. The distance between the double-angle milling cutter and the cylindrical surface is accurately controlled, and the depth dimension precision of the V-shaped groove of the steel plate is accurately controlled.
Description
Technical Field
The invention belongs to the technical field of clamping devices, relates to a steel plate grooving clamping device, and particularly relates to a clamping device for improving the depth dimension precision of steel plate grooving.
Background
The body detonation warhead is internally filled with high-energy fuel, the high-energy fuel is thrown into the air under the action of explosive detonation throwing driving action, the high-energy fuel is mixed with the air to form a large-range active cloud cluster, and the active cloud cluster generates body detonation and releases strong shock waves after secondary detonation of the explosive, so that the body detonation warhead is one of weapons with the greatest power.
Li xiuli et al reported in the literature "application of infrared thermography technology in cloud explosion thermometry" (energetic materials, 6 months 2008, vol 16, p 3 344): after the vertical grooves are uniformly engraved on the outer surface of the shell of the body detonation warhead, the shell is uniformly broken, the fuel is uniformly scattered, the formed cloud cluster is regular in shape, and the explosive power is improved.
The shell of the body detonation warhead is usually formed by rolling a steel plate into a cylinder and then welding the steel plate, the steel plate is made of Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of a notch groove is 2-3 mm, the notch groove is a V-shaped groove, the opening angle of the V-shaped groove is 60-65 degrees, the thickness of the steel plate is the same as the wall thickness of the shell, and the cylinder after being rolled and welded is not processed any more. Compared with the reprocessing of casting blanks, bar stocks and pipe materials, the reprocessing method saves the processing cost and time.
In order to ensure the accuracy of the groove depth on the outer surface of the shell, the steel plate is usually grooved, and after the grooving is completed, the steel plate is rolled into a cylinder and welded to form the cylinder. If the steel plate is rolled and welded into a cylinder and then the groove is engraved on the outer surface, because the roundness error of the cylinder formed by roll welding is large, part of the groove is deep when the groove is engraved again, and the accuracy of the depth of the groove cannot meet the design requirement.
The notch of the steel plate is usually machined on a milling machine, four corners of the steel plate are clamped on a table top of the milling machine, and a double-corner milling cutter is used for machining a V-shaped groove on the steel plate. The aged warriors and others report in the literature "high speed processing technology initial exploration of complex thin-wall, thin-plate parts" (aviation precision manufacturing technology, 2 months 2012, volume 48, page 1, 47): when the ratio of the wall thickness to the width of the steel plate is less than 1:20, the steel plate is defined as a thin plate, the rigidity of the thin plate is poor, and the thin plate is easy to generate elastic deformation during clamping, so that the surface is uneven and part of the position is warped. The whole steel plate plane can not be completely attached to the milling machine table board, different parts of the steel plate are uneven when the V-shaped groove is machined, the precision of the depth dimension of the V-shaped groove is seriously influenced, the depth of the V-shaped groove at the convex part of the steel plate is larger, and the depth of the V-shaped groove at the concave part of the steel plate is smaller. Further, the size precision of a vertical groove on the outer surface of the shell of the body detonation warhead is influenced, so that the shell is not uniformly broken, the uniform spreading degree of fuel is influenced, the shape of a cloud cluster is irregular, and the explosive power is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a clamping device for improving the depth dimension precision of the steel plate grooving, which changes the free irregular warping during the clamping of the thin-wall steel plate into the mandatory fixed direction warping, greatly improves the bending-resistant section coefficient in the direction vertical to the axis of the cylindrical surface, and ensures that the steel plate is in seamless joint with the generatrix at the top end of the cylindrical surface. The distance between the double-angle milling cutter and the cylindrical surface is accurately controlled, and the depth dimension precision of the V-shaped groove of the steel plate is accurately controlled.
The invention provides a clamping device for improving the depth dimension precision of steel plate notches. The steel plate grooving machine comprises a grooving steel plate 1, and is characterized by further comprising a support table 2 and a pressing wheel 3;
the shape of the grooving steel plate 1 is a first rectangular plate, the upper end surface of the first rectangular plate of the grooving steel plate 1 is a first upper end rectangular plane, and the lower end surface of the first rectangular plate of the grooving steel plate 1 is a first lower end rectangular plane;
the first rectangular plate of the notch steel plate 1 is horizontally placed, the notch steel plate 1 is a steel plate before the shell of the body detonation warhead is rolled and welded to be formed, notches are required on the steel plate, the steel plate material is Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of the notches is 2-3 mm, the notches are V-shaped grooves, the opening angle of the V-shaped grooves is 60-65 degrees, when the steel plate is clamped on a common milling machine, the steel plate warps, so that the notch depth size precision is low, the notch depth is not uniform, the shell is not uniformly broken, and the explosion power of the warhead is influenced;
the shape of the support table 2 is a second cuboid, a second bulge is arranged on the upper end face of the second cuboid of the support table 2, the upper surface of the second bulge of the support table 2 is an eighth cylindrical surface, the central axis of the eighth cylindrical surface of the support table 2 is horizontal, a second front-end bulge is arranged at the front end of the eighth cylindrical surface of the support table 2, the height of the second front-end bulge of the support table 2 is three millimeters, a second rear-end bulge is arranged at the rear end of the eighth cylindrical surface of the support table 2, the height of the second rear-end bulge of the support table 2 is three millimeters, and the distance between the second front-end bulge and the second rear-end bulge of the support table 2 exceeds the width of a first rectangular plate of the grooving steel plate 1;
the support table 2 is positioned at the lower end of the grooving steel plate 1, the central axis of the one-eighth cylindrical surface of the support table 2 is parallel to the grooving direction on the grooving steel plate 1, the one-eighth cylindrical surface of the support table 2 is in fit contact with the first lower end rectangular plane of the grooving steel plate 1, the rear end surface of the first rectangular plate of the grooving steel plate 1 is in fit contact with the second rear end bulge of the support table 2, and the front end surface of the first rectangular plate of the grooving steel plate 1 is at a certain distance from the second front end bulge of the support table 2;
the shape of the pressing wheel 3 is a third cylinder, the central axis of the third cylinder of the pressing wheel 3 is horizontal, the outer side surface of the third cylinder of the pressing wheel 3 is a third outer cylindrical surface, the pressing wheel 3 can rotate around the central axis thereof, the central axis of the pressing wheel 3 can move up and down, and the number of the pressing wheels 3 is two;
the central axis of a third cylinder of the pressing wheel 3 is parallel to the central axis of one eighth of the cylindrical surface of the support table 2, the pressing wheel 3 is positioned at the upper end of the grooved steel plate 1, the two pressing wheels 3 are respectively positioned at the left side and the right side of the grooved part of the grooved steel plate 1, and the third outer cylindrical surface of the pressing wheel 3 is in contact with a first upper rectangular plane of the grooved steel plate 1;
the diameter of one eighth of the cylindrical surface of the upper surface of the second bulge of the support table 2 is 3.6-4.4 mm;
when grooving, the pressure intensity generated by the third outer cylinder surface of the pressing wheel 3 facing the first upper end rectangular plane of the grooving steel plate 1 is 151-167 MPa;
the distance between the front end face of the first rectangular plate of the grooving steel plate 1 and the second front end bulge of the support table 2 is 11-16 mm;
the clamping device for improving the depth dimension precision of the steel plate notch groove comprises the following steps:
step 1: placing the grooving steel plate 1 on the support table 2, and enabling the rear end face of a first rectangular plate of the grooving steel plate 1 to be attached to a second rear end bulge of the support table 2;
step 2: moving the pressing wheel 3 downwards, and extruding the grooved steel plate 1 through the pressing wheel 3 to ensure that the first lower end rectangular plane of the grooved steel plate 1 is attached to one eighth of the cylindrical surface of the supporting table 2;
and step 3: measuring the distance between the front end surface of the first rectangular plate of the grooved steel plate 1 and the second front end bulge of the support table 2, when the maximum value and the minimum value of the distance exceed 0.5mm, considering that the joint part of the grooved steel plate 1 and the support table 2 has local warpage, moving the press wheel 3 upwards, readjusting the relative position of the grooved steel plate 1 and the support table 2, moving the press wheel 3 downwards again, extruding the grooved steel plate 1 through the press wheel 3, remeasuring the distance between the front end surface of the first rectangular plate of the grooved steel plate 1 and the second front end bulge of the support table 2 until the maximum value and the minimum value of the distance are lower than 0.5mm, considering that the joint surface of the grooved steel plate 1 and the support table 2 is seamless, and the joint part of the grooved steel plate 1 and the support table 2 is flat and has no warpage;
and 4, step 4: fixing the pressing wheel 3, so that the axis of the pressing wheel 3 cannot move up and down, the pressing wheel 3 cannot freely rotate around the axis of the pressing wheel, and processing a V-shaped groove on a first upper end rectangular plane of the grooved steel plate 1 by using a double-angle milling cutter;
and 5: removing the fixation of the pressing wheel 3, moving the pressing wheel 3 upwards, moving the grooved steel plate 1 leftwards, enabling the position of the upper rectangular plane of the first upper end of the grooved steel plate 1, which is next to the position of the V-shaped groove to be machined, to be positioned at the lower end of the double-angle milling cutter, and repeating the steps 2, 3 and 4 to machine the next V-shaped groove;
step 6: repeating the step 5 until all the V-shaped grooves are processed;
and 7: and cutting off the parts of the leftmost end and the rightmost end of the grooved steel plate 1, which are not processed with the V-shaped grooves due to the need of clamping, so that the V-shaped grooves of the steel plate are processed.
Regarding the diameter of one eighth of the cylindrical surface of the upper surface of the second protrusion of the support table 2 and the pressure generated by the third outer cylinder of the pressing wheel 3 to the rectangular plane of the first upper end of the grooved steel plate 1 and the distance between the front end surface of the first rectangular plate of the grooved steel plate 1 and the second front protrusion of the support table 2 during grooving, any one of the following 2 ways can be adopted:
implementation mode 1: the diameter of one eighth of the cylindrical surface of the upper surface of the second bulge of the support table 2 is 3.6 mm;
when grooving, the pressure intensity generated by the third outer cylinder surface of the pressing wheel 3 facing the first upper end rectangular plane of the grooving steel plate 1 is 151 MPa;
the distance between the front end face of the first rectangular plate of the grooved steel plate 1 and the second front end protrusion of the support table 2 is 11 mm.
Implementation mode 2: the diameter of one eighth of the cylindrical surface of the upper surface of the second bulge of the support table 2 is 4.4 mm;
when grooving, the pressure intensity generated by the third outer cylinder surface of the pressing wheel 3 facing the first upper end rectangular plane of the grooving steel plate 1 is 167 MPa;
the distance between the front end face of the first rectangular plate of the grooved steel plate 1 and the second front end protrusion of the support table 2 is 16 mm.
The clamping device for improving the depth dimension precision of the steel plate notch groove provided by the invention has the following technical effects:
the steel plate material suitable for the invention is Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of the groove is 2-3 mm, the groove is a V-shaped groove, the opening angle of the V-shaped groove is 60-65 degrees, the steel plate is pressed on the supporting platform through the pressing wheel, and the upper end surface of the supporting platform is a cylindrical surface, so the steel plate is forcibly bent along the bending direction of the cylindrical surface at the upper end of the supporting surface. And precisely controlling the distance between the double-angle milling cutter and the cylindrical surface, wherein the distance is the residual thickness of the V-shaped groove part of the steel plate, and the depth dimension precision of the V-shaped groove of the steel plate is precisely controlled.
Drawings
FIG. 1 is a schematic structural diagram of a clamping device for improving the accuracy of the depth dimension of a steel plate notch. 1. Grooving steel plate, 2, a supporting table, 3, a pressing wheel.
Detailed Description
The present invention is further described in detail with reference to the drawings and examples, it should be noted that the present invention is not limited to the following examples, and equivalent changes based on the technical scheme of the present invention are within the scope of the present invention.
Example 1:
as shown in fig. 1, this embodiment provides a clamping device for improving the accuracy of the depth dimension of the notch of the steel plate. The steel plate grooving machine comprises a grooving steel plate 1, and is characterized by further comprising a support table 2 and a pressing wheel 3;
the shape of the grooving steel plate 1 is a first rectangular plate, the upper end surface of the first rectangular plate of the grooving steel plate 1 is a first upper end rectangular plane, and the lower end surface of the first rectangular plate of the grooving steel plate 1 is a first lower end rectangular plane;
the first rectangular plate of the notch steel plate 1 is horizontally placed, the notch steel plate 1 is a steel plate before the shell of the body detonation warhead is rolled and welded to be formed, notches are required on the steel plate, the steel plate material is Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of the notches is 2-3 mm, the notches are V-shaped grooves, the opening angle of the V-shaped grooves is 60-65 degrees, when the steel plate is clamped on a common milling machine, the steel plate warps, so that the notch depth size precision is low, the notch depth is not uniform, the shell is not uniformly broken, and the explosion power of the warhead is influenced;
the shape of the support table 2 is a second cuboid, a second bulge is arranged on the upper end face of the second cuboid of the support table 2, the upper surface of the second bulge of the support table 2 is an eighth cylindrical surface, the central axis of the eighth cylindrical surface of the support table 2 is horizontal, a second front-end bulge is arranged at the front end of the eighth cylindrical surface of the support table 2, the height of the second front-end bulge of the support table 2 is three millimeters, a second rear-end bulge is arranged at the rear end of the eighth cylindrical surface of the support table 2, the height of the second rear-end bulge of the support table 2 is three millimeters, and the distance between the second front-end bulge and the second rear-end bulge of the support table 2 exceeds the width of a first rectangular plate of the grooving steel plate 1;
the support table 2 is positioned at the lower end of the grooving steel plate 1, the central axis of the one-eighth cylindrical surface of the support table 2 is parallel to the grooving direction on the grooving steel plate 1, the one-eighth cylindrical surface of the support table 2 is in fit contact with the first lower end rectangular plane of the grooving steel plate 1, the rear end surface of the first rectangular plate of the grooving steel plate 1 is in fit contact with the second rear end bulge of the support table 2, and the front end surface of the first rectangular plate of the grooving steel plate 1 is at a certain distance from the second front end bulge of the support table 2;
the shape of the pressing wheel 3 is a third cylinder, the central axis of the third cylinder of the pressing wheel 3 is horizontal, the outer side surface of the third cylinder of the pressing wheel 3 is a third outer cylindrical surface, the pressing wheel 3 can rotate around the central axis thereof, the central axis of the pressing wheel 3 can move up and down, and the number of the pressing wheels 3 is two;
the central axis of a third cylinder of the pressing wheel 3 is parallel to the central axis of one eighth of the cylindrical surface of the support table 2, the pressing wheel 3 is positioned at the upper end of the grooved steel plate 1, the two pressing wheels 3 are respectively positioned at the left side and the right side of the grooved part of the grooved steel plate 1, and the third outer cylindrical surface of the pressing wheel 3 is in contact with a first upper rectangular plane of the grooved steel plate 1;
the using method and the working principle of the invention are as follows:
the clamping device for improving the depth dimension precision of the steel plate notch groove comprises the following steps:
step 1: placing the grooving steel plate 1 on the support table 2, and enabling the rear end face of a first rectangular plate of the grooving steel plate 1 to be attached to a second rear end bulge of the support table 2;
step 2: moving the pressing wheel 3 downwards, and extruding the grooved steel plate 1 through the pressing wheel 3 to ensure that the first lower end rectangular plane of the grooved steel plate 1 is attached to one eighth of the cylindrical surface of the supporting table 2;
and step 3: measuring the distance between the front end surface of the first rectangular plate of the grooved steel plate 1 and the second front end bulge of the support table 2, when the maximum value and the minimum value of the distance exceed 0.5mm, considering that the joint part of the grooved steel plate 1 and the support table 2 has local warpage, moving the press wheel 3 upwards, readjusting the relative position of the grooved steel plate 1 and the support table 2, moving the press wheel 3 downwards again, extruding the grooved steel plate 1 through the press wheel 3, remeasuring the distance between the front end surface of the first rectangular plate of the grooved steel plate 1 and the second front end bulge of the support table 2 until the maximum value and the minimum value of the distance are lower than 0.5mm, considering that the joint surface of the grooved steel plate 1 and the support table 2 is seamless, and the joint part of the grooved steel plate 1 and the support table 2 is flat and has no warpage;
and 4, step 4: fixing the pressing wheel 3, so that the axis of the pressing wheel 3 cannot move up and down, the pressing wheel 3 cannot freely rotate around the axis of the pressing wheel, and processing a V-shaped groove on a first upper end rectangular plane of the grooved steel plate 1 by using a double-angle milling cutter;
and 5: removing the fixation of the pressing wheel 3, moving the pressing wheel 3 upwards, moving the grooved steel plate 1 leftwards, enabling the position of the upper rectangular plane of the first upper end of the grooved steel plate 1, which is next to the position of the V-shaped groove to be machined, to be positioned at the lower end of the double-angle milling cutter, and repeating the steps 2, 3 and 4 to machine the next V-shaped groove;
step 6: repeating the step 5 until all the V-shaped grooves are processed;
and 7: and cutting off the parts of the leftmost end and the rightmost end of the grooved steel plate 1, which are not processed with the V-shaped grooves due to the need of clamping, so that the V-shaped grooves of the steel plate are processed.
The working principle of the invention is as follows:
because the thin-wall steel plate has poor rigidity and is easy to bend, warp and deform, the interior of the steel plate can warp under the extrusion clamping force vertical to the plane of the steel plate after the steel plate is clamped by adopting conventional processing, and the surface of the steel plate is uneven, so that the depth of a processed V-shaped groove is uneven. According to the invention, the steel plate is pressed on the cylindrical surface, the steel plate is bent in one direction through the extrusion force, once the steel plate is bent in the direction, the bending-resistant section coefficient of the steel plate which is bent again in other directions is increased, namely the bending difficulty in other directions is increased, and the steel plate can not be warped again in other directions. And the highest point of the steel plate and the cylindrical surface is in line contact at the beginning, the extrusion force of the contact line is the largest, although the steel plate is completely attached to the cylindrical surface, the extrusion force of the contact line of the steel plate and the highest point of the cylindrical surface is the largest, under the mutual extrusion action, the contact line is seamless, the lower end of the steel plate is based on the line of the highest point of the cylindrical surface, and the upper end of the steel plate is processed with the V-shaped groove, so that no warpage exists on the straight line of the V-shaped groove processed by the steel plate, the processing error caused by clamping is avoided, and the precision of the depth dimension of the V-shaped groove is improved.
The steel sheet is laminated with the one-eighth face of cylinder of the protruding upper surface of second of brace table 2 after being extrudeed, when the one-eighth face of cylinder diameter of the protruding upper surface of second of brace table 2 is too big, the bending curvature radius of steel sheet is too big, the degree of buckling is too low, on the one hand, the extrusion force of steel sheet and brace table 2 is too little, the laminating degree of steel sheet and brace table 2 top is too little, on the other hand, the steel sheet degree of buckling has hanged down after, the bending resistance section coefficient of other directions is not big enough, still there is the possibility that other directions buckle, thereby take place the warpage. The grooving precision is reduced; when the diameter of one eighth of the cylindrical surface of the upper surface of the second protrusion of the support table 2 is too small, the bending curvature radius of the steel plate is too small, the bending degree is too large, and the steel plate is easy to generate permanent deformation after bending. The next procedure is to roll the steel plate into a cylinder after the V-shaped groove is machined on the steel plate, and the cylinder machining process is to roll the steel plate into the cylinder, so that the next machining procedure is affected if the steel plate is bent and deformed. A large number of experiments find that when the diameter of the one-eighth cylindrical surface of the upper surface of the second protrusion of the support table 2 is 3.6-4.4 mm, the problems can be avoided, the functions can be realized, and the use requirement is met.
In this embodiment, the diameter of one eighth of the cylindrical surface of the upper surface of the second protrusion of the support table 2 is 3.6 mm;
when grooving, the third outer cylinder surface of the pinch roller 3 extrudes the first upper end rectangular plane of the grooving steel plate 1, and the steel plate cannot jump in the grooving process, otherwise, the grooving position will be changed, so that the machining precision cannot meet the use requirement. Therefore, when the pressure generated by the third outer cylinder of the pressing wheel 3 to the first upper end rectangular plane of the grooved steel plate 1 is too small, the steel plate has a tendency risk of moving due to too small extrusion force to the steel plate, and once the steel plate moves, the position of the groove changes, which results in product rejection. When the pressure generated by the third outer cylinder of the pressing wheel 3 to the first upper end rectangular plane of the grooved steel plate 1 is too large, the pressing force of the pressing wheel 3 to the grooved steel plate 1 is too large, so that the pressing wheel is easy to generate local compression yield deformation, and the product is scrapped. A large number of experiments show that when the pressure generated by the third outer cylinder surface of the pressing wheel 3 to the first upper end rectangular plane of the grooved steel plate 1 is 151-167 MPa, the problems can be avoided, the functions can be realized, and the use requirements are met.
In the embodiment, the pressure intensity generated by the third outer cylinder of the pinch roller 3 facing the first upper end rectangular plane of the grooved steel plate 1 is 151 MPa;
a certain distance exists between the front end surface of the first rectangular plate of the grooving steel plate 1 and the second front end bulge of the support table 2, and the distance is a measurement distance for whether the steel plate is flat or not. The distance must be of varying magnitude once the steel plate does not fit into the abutment 2. Once the steel plate inclines along the vertical axis, the distance must be from small to large, the distance is measured before grooving and the distance is measured after grooving, and the distance is compared, if the distance changes, the steel plate leaps in the machining process is proved, and the grooving position is wrong, so that whether the clamping of the steel plate is smooth and firm can be verified by measuring the distance, and whether the size precision and the position precision of the grooving are correct can be further known. If the distance between the front end face of the first rectangular plate of the grooved steel plate 1 and the second front end bulge of the support table 2 is too small, the measurement is difficult by using a common caliper, so that the measurement result is inaccurate, and the result of the invention is unreliable. If the distance between the front end face of the first rectangular plate of the grooved steel plate 1 and the second front end protrusion of the support table 2 is too large, the error of the measurement result due to too large value is too large, and the result of the present invention is also unreliable. Through a large amount of experiments, when the distance between the front end face of the first rectangular plate of the grooving steel plate 1 and the second front end protrusion of the supporting table 2 is 11-16 mm, the problems can be avoided, the functions can be realized, and the use requirement is met.
In this embodiment, the distance between the front end face of the first rectangular plate of the grooved steel plate 1 and the second front end protrusion of the support table 2 is 11 mm;
the method comprises the steps of purchasing two same steel plates, enabling the thickness to meet the precision requirement, using a laser cutting method to enable the length and the width to meet the precision requirement, using a milling machine of the original scheme to machine a V-shaped groove on one of the steel plates, measuring the depth of the V-shaped groove after machining is completed, and enabling the difference between the maximum depth and the minimum depth to exceed 1mm, wherein the depth difference causes that a shell cannot be uniformly broken, and influences are caused on subsequent cloud cluster throwing and detonation. The depth of the V-shaped groove is measured after the other steel plate is processed by the method, the difference between the maximum depth and the minimum depth is not more than 0.1mm, the depth of the notch groove is considered to be uniform, the shell can be uniformly broken at the notch groove part, and the explosive power of a warhead is ensured. The invention proves to be effective.
The clamping device for improving the depth dimension precision of the steel plate notch groove provided by the invention has the following technical effects:
the steel plate material suitable for the invention is Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of the groove is 2-3 mm, the groove is a V-shaped groove, the opening angle of the V-shaped groove is 60-65 degrees, the steel plate is pressed on the supporting platform through the pressing wheel, and the upper end surface of the supporting platform is a cylindrical surface, so the steel plate is forcibly bent along the bending direction of the cylindrical surface at the upper end of the supporting surface. And precisely controlling the distance between the double-angle milling cutter and the cylindrical surface, wherein the distance is the residual thickness of the V-shaped groove part of the steel plate, and the depth dimension precision of the V-shaped groove of the steel plate is precisely controlled.
Example 2:
example 2 differs from example 1 in that:
in this embodiment, the diameter of one eighth of the cylindrical surface of the upper surface of the second protrusion of the support table 2 is 4.4 mm;
in the embodiment, the pressure intensity generated by the third outer cylinder of the pressure wheel 3 facing the first upper end rectangular plane of the grooved steel plate 1 is 167 MPa;
in this embodiment, the distance between the front end face of the first rectangular plate of the grooved steel plate 1 and the second front end protrusion of the support table 2 is 16 mm;
the method comprises the steps of purchasing two same steel plates, enabling the thickness to meet the precision requirement, using a laser cutting method to enable the length and the width to meet the precision requirement, using a milling machine of the original scheme to machine a V-shaped groove on one of the steel plates, measuring the depth of the V-shaped groove after machining is completed, and enabling the difference between the maximum depth and the minimum depth to exceed 1mm, wherein the depth difference causes that a shell cannot be uniformly broken, and influences are caused on subsequent cloud cluster throwing and detonation. The depth of the V-shaped groove is measured after the other steel plate is processed by the method, the difference between the maximum depth and the minimum depth is not more than 0.1mm, the depth of the notch groove is considered to be uniform, the shell can be uniformly broken at the notch groove part, and the explosive power of a warhead is ensured. The invention proves to be effective.
The clamping device for improving the depth dimension precision of the steel plate notch groove provided by the invention has the following technical effects:
the steel plate material suitable for the invention is Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of the groove is 2-3 mm, the groove is a V-shaped groove, the opening angle of the V-shaped groove is 60-65 degrees, the steel plate is pressed on the supporting platform through the pressing wheel, and the upper end surface of the supporting platform is a cylindrical surface, so the steel plate is forcibly bent along the bending direction of the cylindrical surface at the upper end of the supporting surface. And precisely controlling the distance between the double-angle milling cutter and the cylindrical surface, wherein the distance is the residual thickness of the V-shaped groove part of the steel plate, and the depth dimension precision of the V-shaped groove of the steel plate is precisely controlled.
Claims (3)
1. A clamping device for improving the depth dimension precision of steel plate grooving. The steel plate grooving machine comprises a grooving steel plate (1), and is characterized by further comprising a supporting table (2) and a pressing wheel (3);
the shape of the grooving steel plate (1) is a first rectangular plate, the upper end surface of the first rectangular plate of the grooving steel plate (1) is a first upper end rectangular plane, and the lower end surface of the first rectangular plate of the grooving steel plate (1) is a first lower end rectangular plane;
the first rectangular plate of the grooving steel plate (1) is horizontally placed, the grooving steel plate (1) is a steel plate before the shell of the body detonation warhead is rolled and formed, grooving is needed on the steel plate, the steel plate is made of Q235 steel, the thickness of the steel plate is 8-10 mm, the width of the steel plate is 1.8-2 m, the depth of the grooving is 2-3 mm, the grooving is a V-shaped groove, the opening angle of the V-shaped groove is 60-65 degrees, when the steel plate is clamped on a common milling machine, the steel plate is warped, so that the dimensional accuracy of the grooving depth is low, the grooving depth is uneven, the shell is broken unevenly, and the explosive power of the warhead is influenced, and the invention is responsible for improving the dimensional accuracy of the grooving depth of the steel plate;
the supporting table (2) is in a second cuboid shape, a second bulge is arranged on the upper end face of the second cuboid of the supporting table (2), the upper surface of the second bulge of the supporting table (2) is an eighth cylindrical surface, the central axis of the eighth cylindrical surface of the supporting table (2) is horizontal, a second front-end bulge is arranged at the front end of the eighth cylindrical surface of the supporting table (2), the height of the second front-end bulge of the supporting table (2) is three millimeters, a second rear-end bulge is arranged at the rear end of the eighth cylindrical surface of the supporting table (2), the height of the second rear-end bulge of the supporting table (2) is three millimeters, and the distance between the second front-end bulge of the supporting table (2) and the second rear-end bulge exceeds the width of a first rectangular plate of the grooving steel plate (1);
the support table (2) is positioned at the lower end of the grooving steel plate (1), the central axis of the eighth cylindrical surface of the support table (2) is parallel to the grooving direction on the grooving steel plate (1), the eighth cylindrical surface of the support table (2) is in fit contact with the first lower rectangular plane of the grooving steel plate (1), the rear end surface of the first rectangular plate of the grooving steel plate (1) is in fit contact with the second rear end bulge of the support table (2), and the front end surface of the first rectangular plate of the grooving steel plate (1) is away from the second front end bulge of the support table (2);
the shape of the pressing wheel (3) is a third cylinder, the central axis of the third cylinder of the pressing wheel (3) is horizontal, the outer side surface of the third cylinder of the pressing wheel (3) is a third outer cylindrical surface, the pressing wheel (3) can rotate around the central axis thereof, the central axis of the pressing wheel (3) can move up and down, and the number of the pressing wheels (3) is two;
the central axis of a third cylinder of the pressing wheel (3) is parallel to the central axis of one eighth of the cylindrical surface of the support table (2), the pressing wheel (3) is positioned at the upper end of the grooving steel plate (1), the two pressing wheels (3) are respectively positioned at the left side and the right side of the grooving part of the grooving steel plate (1), and the third outer cylindrical surface of the pressing wheel (3) is in contact with the first upper rectangular plane of the grooving steel plate (1);
the diameter of one eighth of the cylindrical surface of the upper surface of the second bulge of the support table (2) is 3.6-4.4 mm;
when grooving, the pressure intensity generated by the third outer cylinder surface of the pressing wheel (3) to the first upper end rectangular plane of the grooving steel plate (1) is 151-167 MPa;
the distance between the front end face of the first rectangular plate of the grooving steel plate (1) and the second front end bulge of the support table (2) is 11-16 mm;
the clamping device for improving the depth dimension precision of the steel plate notch groove comprises the following steps:
step 1: placing the grooving steel plate (1) on the support table (2) to enable the rear end face of a first rectangular plate of the grooving steel plate (1) to be attached to a second rear end bulge of the support table (2);
step 2: moving the pressing wheel (3) downwards, and extruding the grooved steel plate (1) through the pressing wheel (3) to ensure that the first lower end rectangular plane of the grooved steel plate (1) is attached to one eighth of the cylindrical surface of the supporting table (2);
and step 3: measuring the distance between the front end surface of a first rectangular plate of the grooving steel plate (1) and a second front end bulge of the supporting table (2), when the maximum value and the minimum value of the distance exceed 0.5mm, considering that the joint part of the grooving steel plate (1) and the supporting table (2) has local warpage, moving the pressing wheel (3) upwards, readjusting the relative position of the grooving steel plate (1) and the supporting table (2), moving the pressing wheel (3) downwards again, extruding the grooving steel plate (1) through the pressing wheel (3), remeasuring the distance between the front end surface of the first rectangular plate of the grooving steel plate (1) and the second front end bulge of the supporting table (2), and considering that the joint surface of the grooving steel plate (1) and the supporting table (2) is seamless until the maximum value and the minimum value of the distance are lower than 0.5mm, wherein the joint part of the grooving steel plate (1) and the supporting table (2) is flat, no warping is present;
and 4, step 4: fixing the pressing wheel (3) to ensure that the axis of the pressing wheel (3) cannot move up and down, the pressing wheel (3) cannot freely rotate around the axis of the pressing wheel, and processing a V-shaped groove on a first upper end rectangular plane of the grooved steel plate (1) by using a double-angle milling cutter;
and 5: the fixing of the pressing wheel (3) is released, the pressing wheel (3) is moved upwards, the grooving steel plate (1) is moved leftwards, the position, which is required to process the V-shaped groove, of the upper rectangular plane of the first upper end of the grooving steel plate (1) is located at the lower end of the double-angle milling cutter, the steps 2, 3 and 4 are repeated, and the next V-shaped groove is processed;
step 6: repeating the step 5 until all the V-shaped grooves are processed;
and 7: and cutting off the parts of the leftmost end and the rightmost end of the grooved steel plate (1) which are not processed with the V-shaped grooves due to clamping, so that the V-shaped grooves of the steel plate are processed.
2. The clamping device for improving the dimensional accuracy of the depth of the notch of the steel plate as defined in claim 1, wherein the diameter of one eighth of the cylindrical surface of the upper surface of the second protrusion of the support platform (2) is 3.6 mm;
when grooving, the pressure intensity generated by the third outer cylinder surface of the pinch roller (3) to the first upper end rectangular plane of the grooving steel plate (1) is 151 MPa;
the distance between the front end face of the first rectangular plate of the grooving steel plate (1) and the second front end bulge of the support table (2) is 11 mm.
3. The clamping device for improving the dimensional accuracy of the depth of the notch of the steel plate as defined in claim 1, wherein the diameter of one eighth of the cylindrical surface of the upper surface of the second protrusion of the support platform (2) is 4.4 mm;
when grooving, the pressure intensity generated by the third outer cylinder surface of the pressing wheel (3) to the rectangular plane at the first upper end of the grooving steel plate (1) is 167 MPa;
the distance between the front end surface of the first rectangular plate of the grooving steel plate (1) and the second front end bulge of the support table (2) is 16 mm.
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