Fusion type hammer head of pressure measuring machine
By designing a variety of hammer head structures for different steel types, the problem of edge peeling during hot rolling is solved, effectively reducing the peeling defects and improving the rolling quality.
Patent Information
- Application Number
- CN202323553189.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-25
AI Technical Summary
The problem of edge peeling in the hot rolling process is multiple and uncertain, and the prior art is difficult to effectively solve, especially in the rolling process of different steel types, the peeling defects are difficult to effectively reduce.
A fusion hammer head of the press measuring machine is designed, including three sets of splicable hammer heads, designed for different steel types, and the shape and structure of the hammer head are adjusted to achieve rapid switching to reduce the occurrence of slitting. The first hammer head is used for carbon steel, with arc-shaped central convex to reduce temperature loss; the second hammer head is used for IF steel and phosphide steel, and adopts a central inclined recessed design to reduce bidirectional heat exchange; the third hammer head is used for silicon steel, Designed as a flat hammer head to relieve skin curl.
Through the fusion design of multiple hammer heads and the matching of steel types, the hammer head structure can be quickly switched, significantly reducing the incidence of edge black lines and skin defects, and improving the quality of the rolling process.
Smart Images
Figure CN222241939U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hot rolling, and more specifically relates to a fusion hammer head of a pressure measuring machine. Background Art
[0002] The problem of hot-rolled edge warping has troubled hot rolling for many years. It is characterized by multiple and uncertain characteristics. Most of the defects caused by warping are distributed on both sides of the strip away from the edge. There is also a type of defect distributed in non-edge positions. The physical edge defects are similar to the basic morphology detected by the surface inspection instrument. Figure 1 and Figure 2 As shown, it can be seen that the defect is almost completely parallel to the edge of the strip along the rolling direction (very straight). When the degree of defect is relatively light, it appears as continuous or intermittent black lines or bright lines. When the degree is relatively serious, warping will occur. The warping width is about 1-3mm. Usually, the skin peels off on one side close to the edge, and the other side is still connected to the substrate. The distance between the defect and the edge of the strip is usually less than 30mm, and some defects are greater than 30mm from the edge of the strip.
[0003] Comparing the energy spectrum analysis of defects in different positions and shapes of the peeling skin, we can get two different results, such as Figure 3 Figures (a) and (b) show two typical energy spectra. Figure (a) shows that the components of the defect are O and Fe, indicating that they are iron oxides. The mechanism of this type of scale formation involves two parts: side wrinkling and side flipping. Side wrinkling primarily occurs during the roughing process, while side flipping primarily occurs during the roughing process. Figure (b) shows components such as Al, Ca, and Na in addition to O and Fe. These components are similar to those of the mold slag in the continuous casting mold. It can be inferred that this type of scale formation is caused by slag curling on the surface of the ingot during the continuous casting process.
[0004] Japanese researchers Kohno et al. were the first to study the mechanisms and control measures for this type of defect. They reached some preliminary conclusions: when plate thickness exceeds 70mm, no edge linear defects occur. However, when plate thickness is less than 70mm, the distance from the edge of the strip or plate increases with increasing reduction. The cause of these edge linear defects was initially determined to be tiny wrinkles at the corners of the slab. During the continuous reduction process during flat rolling, the metal on the side of the slab expands in a drum-like shape, causing the corners of the slab to continuously shift toward the upper surface, ultimately forming linear defects. Subsequently, Yamaguchi et al. conducted a detailed study on the generation mechanism and elimination (mitigation) measures of edge linear defects during stainless steel rolling. They also believed that metal wrinkles at the corners were the main cause of edge linear defects and proposed solutions. One solution was to design the vertical rollers with a convex hole profile. Although this measure can effectively reduce the distance between the defects and the edge of the strip, the hole profile may scratch the upper and lower surfaces of the slab, forming another type of edge linear defect. Another solution is to design the anvil of the width setting mill with a convex shape. This measure can effectively avoid the shortcomings of the vertical roller hole profile design and also provides a new development idea. At present, the industry is still developing and innovating on how to reduce the problem of rolling warping.
[0005] A search revealed that patent publication number CN207681171U provides a hammer head for a width-sizing mill. The hammer head body is designed with grooves that contact the slab surface. This modification of the traditional hammer head structure reduces the incidence of edge warping defects in low-carbon aluminum and IF mild steel. Patent publication number CN112080690A provides a method for controlling edge warping defects in hot-rolled automotive strip. By utilizing a concave side-pressing hammer head and controlled cooling and rolling, this method reduces edge warping defects in hot-rolled steel caused by upward tilting and tearing of the intermediate slab corners during rolling. In practice, this solution still has room for further optimization. Utility Model Content
[0006] 1. Problems to be solved
[0007] In view of the fact that the hot-rolled edge peeling problem has troubled the rolling mill for many years and is multi-occurring and uncertain, the utility model intends to provide a pressure gauge fusion hammer head. According to the classification of steel types, matching pressure gauge hammer head types are designed, and the pressure gauge hammer heads are integrated into a set of hammer heads. When rolling steel types with different composition systems, the hammer heads are switched up and down to measure the pressure of the intermediate steel billet, so as to achieve rapid switching of hammer heads and reduce the occurrence of edge peeling.
[0008] 2. Technical solution
[0009] In order to solve the above problems, the present invention adopts the following technical solutions.
[0010] The utility model discloses a fusion hammer head for a pressure measuring machine, comprising a connecting frame, wherein an installation portion for installing the fusion hammer head on a work station is provided on the outer side of the connecting frame, and a first hammer head, a second hammer head and a third hammer head are arranged on the inner side of the connecting frame, and the three groups of hammer heads are spliced and arranged along the height direction of the connecting frame;
[0011] The middle of the first hammer head is provided with an inwardly concave area, the center of which has a central convex portion convex outward in an arc shape; the middle of the second hammer head is provided with an inwardly concave portion; the middle of the third hammer head is provided with an outwardly convex vertical extension section.
[0012] Furthermore, the first hammer head includes a first main body, and outer end portions are symmetrically provided at both ends of the first main body, the inner side of the outer end portion extends inwardly to form an internal depression, and the inner side wall surface of the outer end portion is connected to the central protrusion through a straight extending transition portion; the outward protruding width of the central protrusion is smaller than the extension width of the outer end portion, so that the central protrusion is still in the internal depression area.
[0013] Furthermore, the vertical height L1 of the central protrusion is 200-220 mm, and the extension depth H1 of the inner recessed area is 5-15 mm.
[0014] Furthermore, the inner wall surface of the outer end portion extends inwardly in an inclined manner, and an angle θ1 between the inclined wall surface and the horizontal plane is 30°-40°.
[0015] Furthermore, the second hammer head includes a second main body, and the two ends of the second main body are symmetrically provided with outward-inclined portions. The inner side of the outward-inclined portion extends inwardly to connect with the inner recessed portion. The inner recessed portion is a vertically extending wall surface, thereby forming an internal recessed area in the middle of the second main body with an opening cross-section that gradually increases outward.
[0016] Furthermore, the vertical extension height L2 of the inner concave portion is 200-220 mm, the depth H2 of the inner concave area is 8-20 mm, and the angle θ2 between the inner inclined wall surface of the outwardly inclined portion and the horizontal plane is 30°-40°.
[0017] Furthermore, the third hammer head is symmetrically provided with convex ends extending outwardly and obliquely toward the middle at both ends, and the convex ends at both ends are connected by a vertically distributed middle area, so that the middle area is convex outward compared to the two ends.
[0018] Furthermore, the length L3 of the vertical extension section protruding outward from the middle of the third hammer head is 200-220 mm, and the angle θ3 between the inclined wall surface of the protruding end and the horizontal plane is 70°-80°.
[0019] Furthermore, positions of the maximum outwardly extending widths of the first hammer head, the second hammer head, and the third hammer head are located on the same vertical plane.
[0020] Furthermore, the third hammer head is located in the middle of the connecting frame, and the first hammer head and the second hammer head are located on both sides of the third hammer head.
[0021] 3. Beneficial effects
[0022] Compared with the prior art, the beneficial effects of the present invention are:
[0023] (1) The utility model adopts a fusion design of multiple hammer heads and specially designs corresponding hammer head structures for different steel types. In practice, different types of hammer heads can be selected for different steel types to quickly switch and reduce the incidence of edge black lines and edge warping defects.
[0024] (2) The first hammer head in the utility model is used for carbon steel processing. A central convex portion is provided in the middle of the hammer head which is arc-shaped and smoothly protrudes outward. The smooth curved edge design can effectively reduce the temperature loss at the corners. The temperature uniformity has the effect of refining the grains, which can effectively reduce the occurrence of warping. The second hammer head is used for processing IF steel and phosphating steel. The middle part is inclined and concave. When processing the steel, the corners of the intermediate billet are chamfered, which reduces the two-way heat exchange of the right-angled intermediate billet, thereby effectively alleviating the warping phenomenon at the edges. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a photo of the actual object with peeling defects in the background technology;
[0026] Figure 2 This is a photo of the surface inspection of the peeling defect in the background technology;
[0027] Figure 3 Schematic diagram of energy spectrum analysis of two typical peeling defects mentioned in the background technology;
[0028] Figure 4 This is a schematic diagram of the hammer structure of the utility model;
[0029] Figure 5 This is a schematic diagram of the hammer head passing steel in the utility model;
[0030] Figure 6 This is a schematic diagram of the first hammer structure in the utility model;
[0031] Figure 7 This is a schematic diagram of the second hammer structure in the present utility model;
[0032] Figure 8 This is a schematic diagram of the third hammer structure in the present utility model.
[0033] In the picture:
[0034] 100, first hammer head; 101, first body; 102, outer end portion; 103, transition portion; 104, central convex portion;
[0035] 200, second hammer head; 201, second body; 202, outward-inclined portion; 203, inward-inclined portion;
[0036] 300, third hammer head; 301, convex end;
[0037] 400, connecting frame; 401, installation part. DETAILED DESCRIPTION
[0038] The present invention will be further described below in conjunction with specific embodiments.
[0039] Example
[0040] like Figure 4-Figure 8 As shown, the fusion hammer head of the pressure test machine of this embodiment includes a connecting frame 400. The outer side of the connecting frame 400 is provided with a mounting portion 401 for mounting the fusion hammer head on a work station. The inner side of the connecting frame 400 is arranged with a first hammer head 100, a second hammer head 200 and a third hammer head 300. The three groups of hammer heads are spliced and arranged along the height direction of the connecting frame 400.
[0041] The first hammer head 100 has an inwardly concave area in the middle, and the center of the concave area has a central convex portion 104 protruding outward in an arc shape; the second hammer head 200 has an inwardly concave inner portion 203 in the middle; and the third hammer head 300 has an outwardly protruding vertical extension section in the middle.
[0042] More precisely, if Figure 6 As shown, the first hammer head 100 includes a first main body 101, and outer end portions 102 are symmetrically provided at both ends of the first main body 101. The inner side of the outer end portion 102 extends inwardly and tilted to form an internal depression, and the inner side wall surface of the outer end portion 102 is connected to the central protrusion 104 through a straight extending transition portion 103; the outward protrusion width of the central protrusion 104 is smaller than the extension width of the outer end portion 102, so that the central protrusion 104 is still in the internal depression area, and the various parts are smoothly transitioned and connected. The vertical height L1 of the central protrusion 104 is 200-220mm, specifically 200mm, 205mm, 210mm, 216mm, 220mm, etc. can be used, and 200mm is preferred in practice; the extension depth H1 of the internal recessed area is 5-15mm, specifically 5mm, 8mm, 10mm, 12mm, 15mm, etc. can be used, and 5mm is preferred in practice; the inner wall surface of the outer end portion 102 is inclined and extends inward, and the angle θ1 between the inclined wall surface and the horizontal plane is 30°-40°, specifically 30°, 33°, 35°, 38°, 40°, etc. can be used, and 35° is preferred in practice.
[0043] like Figure 7As shown, the second hammer head 200 includes a second main body 201, and the two ends of the second main body 201 are symmetrically provided with outwardly inclined portions 202. The inner side of the outwardly inclined portion 202 extends inwardly to connect with the inner recessed portion 203. The inner recessed portion 203 is a vertically extending wall surface, thereby forming an internal recessed area in the middle of the second main body 201 with an opening cross-section gradually increasing outward. The cross-section of the internal recessed area is an isosceles trapezoidal shape. More specifically, the vertical extension height L2 of the inner recess 203 is 200-220mm, and specifically 200mm, 205mm, 210mm, 216mm, 220mm, etc. can be used, and 200mm is preferred in practice; the depth H2 of the internal recessed area is 8-20mm, and specifically 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, etc. can be used, and 8mm is preferred in practice; the angle θ2 between the inner inclined wall surface of the outward inclined portion 202 and the horizontal plane is 30°-40°, and specifically 30°, 33°, 35°, 38°, 40°, etc. can be used, and 35° is preferred in practice.
[0044] like Figure 8 As shown, the third hammerhead 300 has symmetrically disposed protruding ends 301 extending outwardly and slanting toward the center at both ends. These protruding ends 301 are connected by a vertically extending middle region, which protrudes outward relative to the ends. More specifically, the length L3 of the vertically extending section protruding outward from the middle of the third hammerhead 300 is 200-220 mm, with specific values of 200 mm, 205 mm, 210 mm, 216 mm, 220 mm, etc. being preferred, with 200 mm being the preferred value in practice. The angle θ3 between the inclined wall surface of the protruding end 301 and the horizontal plane is 70°-80°, with specific values of 70°, 73°, 75°, 78°, 80°, etc. being preferred, with 75° being the preferred value in practice.
[0045] Combine Figure 4 and Figure 5 Preferably, the first hammerhead 100, the second hammerhead 200, and the third hammerhead 300 extend outward at their maximum widths on the same vertical plane. In practice, two sets of fused hammerheads are symmetrically distributed on either side, facing each other, with the billet rolling area formed in the middle. In a specific arrangement, the third hammerhead 300 is located in the middle of the connecting frame 400, with the first hammerhead 100 and the second hammerhead 200 on either side of the third hammerhead 300.
[0046] This embodiment provides a variety of hammer heads of different forms. In practice, the position of the fusion hammer head can be adjusted according to the corresponding hot-rolled steel grade, and the corresponding hammer head can be selected for processing to effectively reduce the occurrence of warping, which is explained in detail below.
[0047] According to the type of hot rolled steel, it is divided into ordinary carbon steel, IF steel, phosphating steel and silicon steel.
[0048] Table 1 Steel grade category composition
[0049]
[0050] For ordinary carbon steel, the present application specifically designs a first hammer head 100 for corresponding processing, and a central protrusion 104 is provided in the middle in an arc shape that smoothly protrudes outward, forming a smooth curved surface. Carbon steel has a carbon content of 0.10-0.21%, and is prone to overheating, decarburization, and excessive oxidation, resulting in coarse original grains at the corners. The mechanism of the cause of warping at the edges of the strip after leaving the heating furnace is that the temperature of the corners drops rapidly, resulting in the inability to recrystallize the grains at the corners, or even if recrystallization occurs, the grains still remain coarse. The yield strength near the corners is significantly lower than the yield strength of other parts. Therefore, the width of the corners during the flat rolling process will exceed that of other parts, resulting in wrinkles on the side of the intermediate billet. These wrinkles can form serious warping defects when turned up. The smooth curved edge design adopted in the present application can effectively reduce the temperature loss at the corners, and the uniform temperature has the effect of refining the grains, which can effectively reduce the occurrence of warping.
[0051] The second hammer head 200 is specifically designed for processing IF steel and phosphated steel. The phase transition temperature of IF steel and phosphated steel is 910°C. The edges and corners of the intermediate billet are at low temperatures and enter the phase transition zone early. This warping mechanism involves two steps: side wrinkling and side flipping. Side wrinkling primarily occurs during roughing, while side flipping primarily occurs during roughing and / or finishing. The second hammer head 200 of this application features a centrally inclined, concave design. This creates chamfers at the edges and corners of the intermediate billet during steel processing, reducing bidirectional heat exchange in the right-angled intermediate billet and effectively alleviating the warping phenomenon.
[0052] The third hammer head 300 specially designed in this application is specifically used for silicon steel processing. Silicon steel has a high Si content, and its phase transformation below 1250°C is a pure ferrite phase transformation. Therefore, silicon steel will not undergo phase transformation during the rolling process. Therefore, it is impossible for the corners of the intermediate billet to have a low temperature and enter the phase transformation zone early. It will not happen that the corner grains cannot be recrystallized or that even if recrystallization occurs, there will still be coarse grains. The edge warping of silicon steel is often caused by complex deformation and wrinkles that are difficult to weld. This application designs a flat hammer head with simple deformation for silicon steel, which has been verified in practice to be able to better alleviate the warping problem.
[0053] Compared with the traditional hammer head design, this application adopts a fusion design of multiple hammer heads and specially designs corresponding hammer head structures for different steel types. In practice, different types of hammer heads can be selected for different steel types to quickly switch and reduce the incidence of black lines and edge warping defects.
[0054] The examples described in the present invention are merely descriptions of the preferred implementation methods of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the scope of protection of the present invention.
Claims
1. A fusion hammer head for a pressure test machine, characterized in that: The invention comprises a connecting frame (400), wherein an installation portion (401) for installing a fusion-type hammer head on a work station is provided on the outer side of the connecting frame (400), and a first hammer head (100), a second hammer head (200) and a third hammer head (300) are arranged on the inner side of the connecting frame (400), and the three groups of hammer heads are spliced and arranged along the height direction of the connecting frame (400); The middle of the first hammer head (100) is provided with an inwardly concave area, the center of which has a central convex portion (104) protruding outward in an arc shape; the middle of the second hammer head (200) is provided with an inwardly concave inner portion (203); and the middle of the third hammer head (300) is provided with a vertically extending section protruding outward.
2. A fusion hammer head for a pressure test machine according to claim 1, characterized in that: The first hammer head (100) comprises a first main body (101), and outer end portions (102) are symmetrically arranged at both ends of the first main body (101); the inner side of the outer end portion (102) extends inwardly and obliquely to form an internal depression, and the inner side wall surface of the outer end portion (102) is connected to the central protrusion (104) through a straightly extending transition portion (103); the outward protrusion width of the central protrusion (104) is smaller than the extension width of the outer end portion (102), so that the central protrusion (104) is still in the internal depression area.
3. A fusion hammer head for a pressure test machine according to claim 2, characterized in that: The vertical height L1 of the central protrusion (104) is 200-220 mm, and the extension depth H1 of the inner recessed area is 5-15 mm.
4. A fusion hammer head for a pressure test machine according to claim 3, characterized in that: The inner wall surface of the outer end portion (102) extends inwardly at an angle, and an angle θ1 between the inner wall surface and the horizontal plane is 30°-40°.
5. The fusion hammer head of a pressure test machine according to claim 1, characterized in that: The second hammer head (200) comprises a second main body (201), and outwardly inclined portions (202) are symmetrically arranged at both ends of the second main body (201). The inner side of the outwardly inclined portion (202) extends inwardly and is connected to the inner concave portion (203). The inner concave portion (203) is a vertically extending wall surface, thereby forming an internal concave area in the middle of the second main body (201) with an opening cross-section gradually increasing outwardly.
6. A fusion hammer head for a pressure test machine according to claim 5, characterized in that: The vertical extension height L2 of the inner concave portion (203) is 200-220 mm, the depth H2 of the inner concave area is 8-20 mm, and the angle θ2 between the inner inclined wall surface of the outward inclined portion (202) and the horizontal plane is 30°-40°.
7. The fusion hammer head of a pressure test machine according to claim 1, characterized in that: The third hammer head (300) is symmetrically provided with convex ends (301) extending outwardly and obliquely toward the middle at both ends, and the convex ends (301) at both ends are connected by a vertically distributed middle area, so that the middle area is in a state of convex outward compared with the two ends.
8. The fusion hammer head of a pressure test machine according to claim 7, characterized in that: The length L3 of the vertical extension section protruding outward from the middle of the third hammer head (300) is 200-220 mm, and the angle θ3 between the inclined wall surface of the protruding end (301) and the horizontal plane is 70°-80°.
9. A fusion hammer head for a pressure test machine according to any one of claims 1 to 8, characterized in that: The positions of the maximum widths of the first hammer head (100), the second hammer head (200) and the third hammer head (300) extending outwards are located on the same vertical plane.
10. A fusion hammer head for a pressure test machine according to claim 9, characterized in that: The third hammer head (300) is located in the middle of the connecting frame (400), and the first hammer head (100) and the second hammer head (200) are located on both sides of the third hammer head (300).