Reducing and sizing rolling method for multi-roller mixed hole type round timber

Abstract

The invention provides a diameter reducing and sizing rolling method for a multi-roller mixed hole type round timber. Comprising the following steps: step 1, reducing through a two-roller hole pattern; and 2, sizing is conducted through a multi-roller hole pattern, and the surface quality and the dimensional tolerance are improved to meet the product standard requirement. According to the method, aiming at the problem that the size precision is difficult to guarantee due to the fact that broadening is difficult to control in the two-roller reducing and sizing process, a pass system of a reducing and sizing unit is optimized, and the cost advantage of two-roller reducing and the advantages that the broadening allowance of multiple rollers is small and the size precision is easy to control are fully utilized; through the characteristic of small broadening of the multi-roller hole pattern, the reducing and sizing process disclosed by the invention is used for obtaining any finished product size at an interval of 0.1 mm under the condition of single incoming material size.

Description

Technical Field

[0001] The invention belongs to the technical field of round material sizing reduction, and in particular relates to a multi-roller mixed-hole round material sizing reduction and sizing rolling method. Background Art

[0002] The round material sizing unit has two characteristics: one is the large rolling mill capacity, which can achieve large deformation and low-temperature rolling capability, with the lowest rolling temperature reaching 750°C; the other is extremely high dimensional accuracy, with dimensional tolerance reaching DIN1 / 8 accuracy.

[0003] There are three main types of traditional round material sizing units, each with its own characteristics and scope of application. The first is a two-roller sizing unit, which has a simple structure and is easy to maintain, but it is prone to large width expansion during rolling and is difficult to ensure high precision, so it is limited in applications with strict dimensional requirements. The second is a three-roller sizing unit, which is known for its high precision and good surface quality. The three-roller system has high stability and can evenly apply rolling pressure, effectively reducing the ovality and diameter deviation of the product. However, the three-roller unit has high manufacturing costs, expensive core components, and high maintenance costs. The third is a four-roller sizing unit, which represents the latest development direction of technology. The four-roller system improves accuracy by increasing the number of rollers to meet the needs of different specifications and materials. However, its complexity leads to very high initial investment and maintenance costs. Due to structural limitations, its load-bearing capacity is small, and it is suitable for production areas with extremely high requirements for accuracy and surface quality.

[0004] Since three-roller and four-roller cores have high precision and complex structure, they are expensive, and two-roller units have great limitations in width control, making the cost of using a sizing unit extremely high. Based on the technical problems existing in the above-mentioned prior art, a method is urgently needed to reduce equipment costs while ensuring high precision. Summary of the invention

[0005] The purpose of the invention is to provide a multi-roller mixed-hole round material diameter reducing and sizing rolling method.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention relates to a multi-roller mixed-pass round material diameter reducing and sizing rolling method, comprising the following steps:

[0008] Step 1, by reducing the sizing amount of the two-roller pass, the incoming material is greatly reduced in diameter; by utilizing the large diameter reducing capacity of the two-roller pass, a smaller incoming material size before sizing can be achieved, thereby simplifying the pass system of the pre-finishing rolling system;

[0009] Step 2: Sizing is performed through multi-roller hole forming to improve the surface quality and dimensional tolerance to meet product standard requirements.

[0010] Preferably, in step 1, the hole types of the two rollers include: an elliptical hole type and a circular hole type.

[0011] Preferably, in step 1, the two-roller pass profile is two or four times.

[0012] Preferably, in step 2, the multi-roller hole profile is a three-roller or four-roller hole profile.

[0013] Preferably, in step 2, the multi-roller pass profile is two sets.

[0014] Preferably, the three-roller hole profile is a positive Y-shaped three-roller hole profile or an inverted Y-shaped three-roller hole profile.

[0015] Preferably, the four-roller hole profile is a "+" type four-roller sizing hole profile or an "X" type four-roller sizing hole profile.

[0016] The patent of this invention is a 4-6-set short-distance sizing machine group, and the last two sets of sizing machine frames are three-roller sizing arrangements of positive Y-inverted Y, or four-roller sizing arrangements of "+"-"X";

[0017] When the present invention is in four-passage operation, the hole type system is sequentially an elliptical two-roller diameter reducing hole type-a circular two-roller diameter reducing hole type-a two-passage sizing rack;

[0018] When the present invention has four shifts, the hole type system is sequentially an elliptical two-roller diameter reducing hole type-a circular two-roller diameter reducing hole type-an elliptical two-roller diameter reducing hole type-a circular two-roller diameter reducing hole type-a two-shift sizing machine frame; the sizing reduction process of the present invention is to obtain any finished product size at a 0.1mm interval under a single incoming material size.

[0019] The two-roller pass profile and the three-roller or four-roller pass profile involved in the present invention are arranged alternately in sequence to optimize the efficiency and accuracy of the diameter reduction and sizing process.

[0020] The method of the invention adopts an online diameter measurement feedback system to adjust the parameters of the rolling mill in real time, so as to realize the precise control of the size and surface quality of the round material.

[0021] The method of the present invention utilizes the large load-bearing capacity of the rolling mill when the number of rollers is small and the high dimensional accuracy of the rolling mill when the number of rollers is large.

[0022] The present invention has the following advantages:

[0023] The method of the present invention aims at the problem that the width expansion is difficult to control during the two-roller sizing process, resulting in difficulty in ensuring dimensional accuracy. By optimizing the hole system of the sizing reduction unit, the cost advantage of two-roller sizing reduction and the advantages of three-roller in small width expansion margin and easy control of dimensional accuracy are fully utilized. The present invention obtains large extension through two-roller rolling and obtains higher dimensional accuracy through the small width expansion characteristic of the multi-roller hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a process flow chart of two-pass two-roller pass and two-pass three-roller pass;

[0025] Figure 2 It is a process flow chart of two-pass two-roller pass and two-pass four-roller pass;

[0026] Figure 3 It is the process flow chart of four-pass two-roller pass and two-pass three-roller pass;

[0027] Figure 4 It is a process flow chart of four-pass two-roller pass and two-pass four-roller pass. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0029] Example 1

[0030] This embodiment relates to a four-roller mixed-pass round material diameter reducing and sizing rolling method, see Figure 1 As shown (process sequence from left to right), the following steps are included:

[0031] Step 1, by reducing the sizing amount through two-pass two-roller pass (from left to right: the first pass is an elliptical pass, the second pass is a round pass) to reduce the incoming material by a large diameter; by utilizing the large diameter reducing capacity of the two-roller pass, a smaller incoming material size before sizing can be achieved, thereby simplifying the pass system of the pre-finishing rolling system;

[0032] Step 2: Sizing is performed through two passes of three-roll mixed hole profiles (the third pass is a positive Y-type three-roll hole profile, and the fourth pass is an inverted Y-type three-roll hole profile) to improve the surface quality and dimensional tolerance to meet the product standard requirements.

[0033] Example 2

[0034] This embodiment relates to a four-roller mixed-pass round material diameter reducing and sizing rolling method, see Figure 2 As shown (process sequence from left to right), the following steps are included:

[0035] Step 1, by reducing the sizing amount of two-roller pass profiles (the first pass is an elliptical pass profile, and the second pass is a round pass profile) in two passes, the incoming material is greatly reduced in diameter; by utilizing the large diameter reducing capacity of the two-roller pass profile, a smaller incoming material size before sizing can be achieved, thereby simplifying the pass profile system of the pre-finishing rolling system;

[0036] Step 2: Sizing is performed through two sets of four-roller mixed hole profiles (the third pass is a "X" type four-roller sizing hole profile, and the fourth pass is an "X" type four-roller sizing hole profile) to improve the surface quality and dimensional tolerance to meet the product standard requirements.

[0037] Example 3

[0038] This embodiment relates to a six-roller mixed-pass round material diameter reducing and sizing rolling method, see Figure 3 As shown (process sequence from left to right), the following steps are included:

[0039] Step 1, reducing the sizing amount by four passes of two-roller pass (the first pass is an elliptical pass, the second pass is a circular pass, the third pass is an elliptical pass, and the fourth pass is a circular pass) to reduce the incoming material by a large diameter; utilizing the large diameter reducing capacity of the two-roller pass, a smaller incoming material size before sizing can be achieved, thereby simplifying the pass system of the pre-finishing rolling system;

[0040] Step 2: Sizing is performed through two passes of three-roll mixed hole profiles (the fifth pass is a positive Y-type three-roll hole profile, and the sixth pass is an inverted Y-type three-roll hole profile) to improve the surface quality and dimensional tolerance to meet the product standard requirements.

[0041] Example 4

[0042] This embodiment relates to a six-roller mixed-pass round material diameter reducing and sizing rolling method, see Figure 4 As shown (process sequence from left to right), the following steps are included:

[0043] Step 1, reducing the sizing amount by four passes of two-roller pass (the first pass is an elliptical pass, the second pass is a circular pass, the third pass is an elliptical pass, and the fourth pass is a circular pass) to reduce the incoming material by a large diameter; utilizing the large diameter reducing capacity of the two-roller pass, a smaller incoming material size before sizing can be achieved, thereby simplifying the pass system of the pre-finishing rolling system;

[0044] Step 2: Sizing is performed through two sets of four-roller mixed hole profiles (the fifth pass is a "X"-shaped four-roller sizing hole profile, and the sixth pass is an "X"-shaped four-roller sizing hole profile) to improve the surface quality and dimensional tolerance to meet the product standard requirements.

[0045] The method of the present invention aims at the problem that the width expansion is difficult to control during the two-roller sizing process, resulting in difficulty in ensuring dimensional accuracy. By optimizing the hole system of the sizing reduction unit, the cost advantage of two-roller sizing reduction and the advantages of three-roller in small width expansion margin and easy control of dimensional accuracy are fully utilized. The present invention obtains large extension through two-roller rolling and obtains higher dimensional accuracy through the small width expansion characteristic of the multi-roller hole.

[0046] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A multi-roller mixed-pass round material diameter reducing and sizing rolling method, characterized in that: The following steps are involved: Step 1, through the two-roller hole type reduction sizing amount, the incoming material is greatly reduced in diameter; Step 2: Sizing is performed through multi-roller hole forming to improve the surface quality and dimensional tolerance to meet product standard requirements.

2. The multi-roll mixed-pass round material diameter reducing and sizing rolling method according to claim 1, characterized in that: In step 1, the hole types of the two rollers include: an elliptical hole type and a circular hole type.

3. The multi-roll mixed-pass round material diameter reducing and sizing rolling method according to claim 1, characterized in that: In step 1, the two-roller pass profile is two or four times.

4. The multi-roll mixed-pass round material diameter reducing and sizing rolling method according to claim 1, characterized in that: In step 2, the multi-roller hole profile is a three-roller or four-roller hole profile.

5. The multi-roll mixed-pass round material diameter reducing and sizing rolling method according to claim 1, characterized in that: In step 1, the two roller pass profiles are two sets.

6. The multi-roll mixed-pass round material diameter reducing and sizing rolling method according to claim 4, characterized in that: The three-roller hole profile is a positive Y-type three-roller hole profile or an inverted Y-type three-roller hole profile.

7. The multi-roll mixed-pass round material diameter reducing and sizing rolling method according to claim 4, characterized in that: The four-roller hole profile is a "+" type four-roller sizing hole profile or an "X" type four-roller sizing hole profile.

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