A preparation method for improving thickness uniformity of molybdenum sheet
By adjusting the bending force and roll crown of the cold rolling mill, the problems of uniform thickness and surface defects of molybdenum thin plates were solved, enabling high-quality production of molybdenum thin plates, which are suitable for high-end manufacturing fields such as chemical, electronics, semiconductor and aerospace industries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU LIANHONG MOLYBDENUM IND CO LTD
- Filing Date
- 2026-04-24
- Publication Date
- 2026-07-14
Smart Images
Figure CN122076833B_ABST
Abstract
Description
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[0001] The present invention relates to the technical field of molybdenum thin plate preparation methods, and particularly relates to a preparation method for improving the thickness uniformity of molybdenum thin plates. Background Art
[0002] Molybdenum thin plates generally refer to rolled molybdenum materials with a thickness below 0.3 mm. Generally, high-purity molybdenum powder is used as the raw material, and it is prepared through processes such as pressing, high-temperature sintering, forging and blooming, multi-pass rolling, and post-treatment. It has excellent high-temperature performance, good thermal and electrical conductivity, a low coefficient of thermal expansion, and good dimensional stability, and is widely used in chemical engineering, electronics, semiconductors, aerospace, and other high-end manufacturing.
[0003] With the continuous improvement of the requirements for material performance in high-end applications, molybdenum thin plates produced by traditional rolling processes face severe challenges in terms of thickness uniformity and surface defect-free. For example, micron-level thickness fluctuations, subtle wrinkles or vertical stripes that are difficult to detect with the naked eye may lead to problems such as uneven heat dissipation, stress concentration, film deposition failure, or circuit short-circuit in downstream components, directly affecting the performance, yield, and reliability of end products. Therefore, achieving precise coordinated control of the plate shape and thickness during the rolling of molybdenum thin plates is the key to breaking through the current industry bottleneck and meeting the needs of cutting-edge technologies. Summary of the Invention
[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a preparation method for improving the thickness uniformity of molybdenum thin plates. The preparation method can improve the thickness uniformity of molybdenum thin plates and reduce their surface defects by simply coordinately adjusting the bending force of the rolling mill and the crown of the rolls, so as to meet the high-end application requirements without changing the rolling process.
[0005] The technical solution of the present invention is as follows:
[0006] A preparation method for improving the thickness uniformity of molybdenum thin plates, which includes:
[0007] (1) Set two rolls with the same crown and both satisfying ⅟15000 < tanθ < ⅟9000 as the upper roll and the lower roll of the cold rolling mill, where tanθ represents the ratio of the difference d between the diameter at the center of the roll body and the diameter at the edge of the roll body to half of the roll length L / 2, and connect the upper roll and the lower roll to the cold rolling mill through a journal anti-torsion neck sleeve connection; <\
[0008] (2) Adjust the bending force of the cold rolling mill until the pressure gauge of the cold rolling mill shows 6 - 8 MPa, and adjust the rotational speed of the cold rolling mill to 30 - 40 m / min;
[0009] (3) The cold rolling mill adjusted in step (2) is used to roll the cold-rolled semi-finished molybdenum sheet with a width ≤420mm, a thickness ≤0.5mm, and a smooth and defect-free surface to obtain the finished molybdenum sheet.
[0010] According to some preferred embodiments of the present invention, the crown of the upper roll and the lower roll are equal, and both are 0.015mm-0.02mm.
[0011] According to some preferred embodiments of the present invention, the crown of the upper roll and the lower roll are equal and both are 0.018 mm.
[0012] According to some preferred embodiments of the present invention, the diameters at the edges of the upper and lower rolls are equal and are both 100 mm, and the roll lengths of the upper and lower rolls are equal and are both 450 mm.
[0013] According to some preferred embodiments of the present invention, in step (2), the bending force of the cold rolling mill is adjusted until the pressure gauge of the cold rolling mill shows 7 MPa.
[0014] According to some preferred embodiments of the present invention, in step (2), the rotational speed of the cold rolling mill is adjusted to 39 m / min.
[0015] According to some preferred embodiments of the present invention, the finished molybdenum sheet has a thickness ≤0.2mm and a width ≤420mm.
[0016] The beneficial effects of this invention include:
[0017] This invention can solve the problems of surface wrinkles, vertical lines, and poor thickness uniformity that easily occur when rolling molybdenum plates with cam rolls, and obtain molybdenum thin plates with significantly improved thickness uniformity and no surface defects.
[0018] This invention can significantly improve the thickness uniformity of molybdenum plates and reduce defects such as local wrinkles and longitudinal stripes on the product surface by simply adjusting the bending force and crown of the rolling mill without changing the rolling process. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the parameters of the convex roller used in the embodiment. Detailed Implementation
[0020] The technical solutions of the present invention will be further described below with reference to the embodiments and accompanying drawings. The embodiments described below are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
[0021] Example 1
[0022] The preparation of molybdenum thin plates is carried out through the following process:
[0023] (1) Set two rolls with the same crown and both satisfying 1 / 15000 < tanθ < 1 / 9000 as the upper and lower rolls of the cold rolling mill. Here, tanθ represents the ratio between the difference (d) in diameter between the center and the edge of the roll body and half of the roll length (L / 2). Connect the upper roll and the lower roll to the cold rolling mill through a journal anti-torsion neck sleeve connection;
[0024] (2) Adjust the bending roll force of the cold rolling mill until the pressure gauge of the cold rolling mill shows 6 - 8 MPa, and adjust the rotational speed of the cold rolling mill to 30 - 40 m / min;
[0025] (3) Roll the cold-rolled semi-finished molybdenum plates with a width ≤ 420 mm, a thickness ≤ 0.5 mm, and a smooth and defect-free surface through the cold rolling mill adjusted in step (2). Before rolling, input the roll gap value corresponding to the rolling pass according to the rolling process card, and then roll to the finished size to obtain the finished molybdenum thin plates.
[0026] Use a micrometer to measure the thickness of the finished molybdenum thin plates. A total of 12 points are measured (4 points on each side). Use the difference between the maximum and minimum values of the molybdenum thin plate thickness measurement as the thickness uniformity measurement value (mm), and at the same time observe whether there are surface defects on the molybdenum thin plates.
[0027] Example 2
[0028] Refer to Appendix Figure 1 , and prepare molybdenum thin plates with finished thicknesses of 0.127 mm, 0.18 mm, and 0.15 mm according to the process of Example 1; among them, the used upper and lower rolls include 4 groups of upper and lower rolls. The diameter of the edge of each group of upper and lower rolls is 100 mm, the roll length is 450 mm, and all satisfy 1 / 15000 < tanθ < 1 / 9000, but the crowns are 0.011 mm, 0.015 mm, 0.018 mm, and 0.02 mm respectively; during the preparation, set the pressure gauge of the cold rolling mill to 7 MPa and adjust the rotational speed of the cold rolling mill to 39 m / min.
[0029] The thickness detection and apparent defect results of the prepared finished molybdenum thin plates are as follows:
[0030] Table 1 Detection results of products with finished thickness T = 0.127 mm
[0031]
[0032] Table 2 Detection results of products with finished thickness T = 0.18 mm
[0033]
[0034] Table 3. Inspection results of products with a finished thickness T=0.15mm
[0035]
[0036] As can be seen from Table 1-3 above, when the roll crown is 0.018mm and 0.02mm, products with no apparent defects and relatively uniform thickness can be obtained. Among them, the rolling effect is best when the roll crown is 0.018mm; while when the roll crown is set to 0.011mm and 0.015mm, the product will have obvious apparent defects and be difficult to roll.
[0037] It should be noted that the above descriptions are merely preferred embodiments of the present invention and should not limit the scope of protection of the technical solutions of the present invention. Any modifications made to the technical solutions described in the foregoing embodiments, or equivalent substitutions of technical features, by those skilled in the art within the spirit and principles of the present invention, should be included within the scope of protection of the present invention.
Claims
1. A method for preparing molybdenum thin plates with improved thickness uniformity, characterized in that, It includes: (1) Two rolling rolls with the same convexity of 0.018 mm and both satisfying 1 / 15000 < tanθ < 1 / 9000 are used as the upper and lower rolling rolls of the cold rolling mill, where tanθ represents the ratio of the difference d between the radius at the center of the roll body and the radius at the edge of the roll body to half of the roll length L / 2, and the upper and lower rolling rolls are connected to the cold rolling mill through the connection of the anti-torsion neck sleeve of the journal; (2) Adjust the bending roll force of the cold rolling mill until the pressure gauge of the cold rolling mill shows 6 - 8 MPa, and adjust the rotational speed of the cold rolling mill to 30 - 40 m / min; (3) Roll the semi-finished molybdenum plate for cold rolling with a width ≤ 420 mm, a thickness ≤ 0.5 mm, and a smooth surface without defects by the cold rolling mill adjusted in step (2) to obtain a finished molybdenum thin plate.
2. The preparation method according to claim 1, characterized in that, The diameters at the edges of the upper and lower rolling rolls are equal, both being 100 mm, and the roll lengths of the upper and lower rolling rolls are equal, both being 450 mm.
3. The preparation method according to claim 1, characterized in that, In step (2), adjust the bending roll force of the cold rolling mill until the pressure gauge of the cold rolling mill shows 7 MPa.
4. The preparation method according to claim 1, characterized in that, In step (2), adjust the rotational speed of the cold rolling mill to 39 m / min.
5. The preparation method according to claim 1, characterized in that, The thickness of the finished molybdenum thin plate ≤ 0.2 mm and the width ≤ 420 mm.