A method for preparing multi-layer diamond beads

Abstract

The present application provides a method for preparing multi-layer diamond beads, comprising the following steps: preparing at least three powders with different diamond concentrations, the powders comprising: a first powder, a second powder and a third powder; the diamond concentration in the second powder is less than the diamond concentration in the first powder and the third powder; sequentially filling the first powder, the second powder and the third powder, cold pressing the filled powders to obtain a cold pressed blank; sintering the cold pressed blank, the sintering temperature is 800-1100°C, the sintering time is 1-6min, and multi-layer diamond beads are obtained after cooling. The present application divides the diamond beads into several sections along the axial direction, controls the concentration of diamonds in each section of the diamond beads, changes the uniformity of the diamond beads during cutting and the problem of the size head caused by the inconsistent wear before and after, controls the distribution of diamonds by filling powders with multiple diamond concentrations for many times, and improves the service life of the diamond beads.

Description

Technical Field

[0001] The present application relates to the technical field of diamond beads, and in particular to a method for preparing multi-layer diamond beads. Background Art

[0002] In recent years, diamond beaded wire saws have been widely used in the stone industry for their short preparation time, flexible cutting, low noise, low dust, low pollution, and energy saving. The beaded wire itself combines the super rigidity of diamonds and the flexibility of ropes, making it suitable for such tasks as rough material mining, reinforced concrete cutting, granite mining, etc. This unique sawing mode is unattainable by other diamond tools; in addition, the beaded wire is almost unlimited in length, which enhances its applicability and plays a unique role in some special occasions such as underwater processing and building demolition. For diamond beaded wire saws, the service life of diamond beads is crucial.

[0003] At present, the manufacturing process of diamond beads is still mainly based on electroplating and hot pressing sintering. Sintered beads have higher wear resistance; compared with hot pressing sintered beads, the production process of electroplated diamond beads is relatively simple, and it is more conducive to the small diameter of beads; because the diamond coating is thin, the wear resistance of the matrix is ​​poor, and the holding force of the plated metal on the diamond abrasive is limited, the diamond abrasive is easy to fall off prematurely, and the overall performance is poor. In the process of preparing diamond beads, the diamond beads are usually loaded once, so that the diamonds are dispersed and evenly distributed in the beads. Since the concentration of diamonds in the filled powder is the same, when used, the parts of the diamond beads that are more worn will be severely worn, which can easily lead to the problem of large and small heads of diamond beads after use, reducing the service life of diamond beads.

[0004] Therefore, how to improve the problem of large and small heads caused by wear during diamond bead cutting and increase the service life of diamonds has become a problem that needs to be solved.

[0005] The above information disclosed in the background section is only for enhancing understanding of the background of the present application and therefore it may contain information that does not form the prior art known to a person of ordinary skill in the art. Summary of the invention

[0006] The present application provides a method for preparing multi-layer diamond beads to solve the problems existing in the prior art.

[0007] The present application provides a method for preparing a multilayer diamond bead, comprising the following steps:

[0008] S1. Prepare at least three powders with different diamond concentrations, the powders comprising: a first powder, a second powder and a third powder;

[0009] Wherein, the diamond concentration in the second powder is less than the diamond concentration in the first powder and the third powder;

[0010] S2, filling the first powder, the second powder and the third powder in sequence, and after the filling is completed, cold pressing the filled powder to obtain a cold pressed green body;

[0011] S3, sintering the cold pressed green body at a temperature of 800-1100° C. for a sintering time of 1-6 min, and obtaining multi-layer diamond beads after cooling.

[0012] In some embodiments, the diamond concentration in the first powder is 30%-40%, the diamond concentration in the second powder is 10%-15%, and the diamond concentration in the third powder is 15%-40%.

[0013] In some embodiments, S2 further includes: filling a fourth powder between the first powder and the second powder at least once.

[0014] In some embodiments, the diamond concentration in the fourth powder is not lower than the diamond concentration in the second powder, and the diamond concentration in the fourth powder is not higher than the diamond concentration in the first powder.

[0015] In some embodiments, the diamond concentration in the fourth powder is 10%-40%.

[0016] In some embodiments, the S2 further includes: filling the fifth powder between the second powder and the third powder at least once.

[0017] In some embodiments, the diamond concentration of the fifth powder is not lower than the diamond concentration of the second powder, and the diamond concentration of the fifth powder is not higher than the diamond concentration of the third powder.

[0018] In some embodiments, the fifth powder has a diamond concentration of 10%-40%.

[0019] In some embodiments, the cold pressing process comprises the following steps:

[0020] S201, granulating the first powder, the second powder and the third powder to be compressed to obtain granulated powder;

[0021] S202, bidirectionally pressing the granulated powder to obtain a pressed cold-pressed green body.

[0022] In some embodiments, the compression ratio of the cold-pressed blank during cold pressing is controlled between 2-3.

[0023] The present application provides a method for preparing a multi-layer diamond bead, comprising the following steps: S1, preparing at least three powders with different diamond concentrations, the powders comprising: a first powder, a second powder and a third powder; wherein the diamond concentration in the second powder is less than the diamond concentration in the first powder and the third powder; S2, filling the first powder, the second powder and the third powder in sequence, and after the filling is completed, cold pressing the filled powder to obtain a cold pressed blank; S3, sintering the cold pressed blank, the sintering temperature is 800-1100°C, the sintering time is 1-6min, and the multi-layer diamond bead is obtained after cooling. The present application performs a cold pressing process after filling a first powder, a second powder and a third powder with different diamond concentrations. During the filling process, it is ensured that the diamond concentration of the filled first powder and the third powder is higher than the diamond concentration of the second powder. The diamond beads are divided into several sections along the axial direction, and then the diamond concentration of each section of the diamond beads is controlled according to the degree of the size of the diamond beads, so that the diamond concentration of the small head is high and the diamond concentration of the large head is low. The diamond concentration in the diamond beads is adjusted according to actual needs, thereby changing the uniformity of the diamond beads during cutting and the size problem caused by inconsistent wear before and after. The distribution of diamonds is controlled by filling powders with multiple diamond concentrations for multiple times, thereby improving the service life of the diamond beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] Figure 1 A flow chart of a method for preparing multi-layer diamond beads provided in this application.

[0026] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "an" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0031] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0032] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0034] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0035] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0036] Figure 1 A flow chart of a method for preparing a multilayer diamond bead provided in this application, such as Figure 1 As shown, the method for preparing the multilayer diamond beads provided in the present application comprises the following steps:

[0037] S1. Prepare at least three powders with different diamond concentrations, the powders comprising: a first powder, a second powder and a third powder;

[0038] Wherein, the diamond concentration in the second powder is less than the diamond concentration in the first powder and the third powder;

[0039] Specifically, in the embodiment of the present application, the diamond concentration in the second powder is lower than the diamond concentration in the first powder, and the diamond concentration in the second powder is lower than the diamond concentration in the third powder.

[0040] It should be noted that the specific composition and proportion of the powder can be obtained based on the existing technology and will not be described here.

[0041] In some embodiments, the diamond concentration in the first powder is 30%-40%, the diamond concentration in the second powder is 10%-15%, and the diamond concentration in the third powder is 15%-40%.

[0042] Specifically, in an embodiment of the present application, the diamond concentration in the first powder may be 30%, 35%, 38%, or 40%, the diamond concentration in the second powder may be 10%, 13%, or 15%, and the diamond concentration in the third powder may be 15%, 20%, 24%, 30%, or 40%.

[0043] To explain more specifically, in the embodiment of the present application, the first powder, the second powder and the third powder have the same composition and only have different diamond concentrations.

[0044] It should be noted that the components of the first powder, the second powder and the third powder in the present application can be known based on the existing technology and will not be described in detail here.

[0045] S2, filling the first powder, the second powder and the third powder in sequence, and after the filling is completed, cold pressing the filled powder to obtain a cold pressed green body;

[0046] In some embodiments, S2 further includes: filling a fourth powder between the first powder and the second powder at least once.

[0047] In some embodiments, the diamond concentration in the fourth powder is not lower than the diamond concentration in the second powder, and the diamond concentration in the fourth powder is not higher than the diamond concentration in the first powder.

[0048] In some embodiments, the diamond concentration in the fourth powder is 10%-40%.

[0049] Specifically, in the embodiment of the present application, the diamond concentration in the fourth powder can be 10%, 15%, 20%, 35%, 40%, etc.

[0050] In some embodiments, the S2 further includes: filling the fifth powder between the second powder and the third powder at least once.

[0051] In some embodiments, the diamond concentration of the fifth powder is not lower than the diamond concentration of the second powder, and the diamond concentration of the fifth powder is not higher than the diamond concentration of the third powder.

[0052] In some embodiments, the fifth powder has a diamond concentration of 10%-40%.

[0053] Specifically, in the embodiment of the present application, the diamond concentration in the fifth powder can be 10%, 16%, 25%, 30%, 35%, 40%, etc.

[0054] S3, sintering the cold pressed green body at a temperature of 800-1100° C. for a sintering time of 1-6 min, and obtaining multi-layer diamond beads after cooling.

[0055] Specifically, in the embodiments of the present application, the sintering temperature can be 800°C, 820°C, 850°C, 880°C, 900°C, 1100°C, etc., and the sintering time can be 1min, 2min, 3min, 5min, 6min, etc.

[0056] In some embodiments, the cold pressing process comprises the following steps:

[0057] S201, granulating the first powder, the second powder and the third powder to be compressed to obtain granulated powder;

[0058] S202, bidirectionally pressing the granulated powder to obtain a pressed cold-pressed green body.

[0059] In some embodiments, the compression ratio of the cold-pressed blank during cold pressing is controlled between 2-3.

[0060] It should be noted that during cold pressing, only the cold pressed blank is formed into a circular cylindrical structure; the automatic cold pressing machine adopts the automatic sinking technology of the pressing head to increase the life of the cold pressing female mold. The automatic sinking technology is realized by a servo motor and a displacement sensor, or by a servo motor and a displacement electronic ruler.

[0061] Specifically, in the embodiment of the present application, the compression ratio of the cold-pressed blank during cold pressing can be 2, 2.5, or 3.

[0062] It should be noted that, in the embodiment of the present application, when the compression ratio is 2, it can be understood that the volume ratio of the filled powder to the cold-pressed green body is 2:1; when the compression ratio is 3, it can be understood that the volume ratio of the filled powder to the cold-pressed green body is 3:1.

[0063] The following are specific embodiments:

[0064] Embodiment 1:

[0065] Prepare three powders with different diamond concentrations, the powders comprising: a first powder, a second powder and a third powder; wherein the diamond concentration in the first powder is 40%, the diamond concentration in the second powder is 15%, and the diamond concentration in the third powder is 30%;

[0066] The first powder, the second powder and the third powder to be pressed are granulated to obtain granulated powder; the first powder, the second powder and the third powder having different diamond concentrations after granulation are sequentially filled into a cold pressing device, and after the filling is completed, the filled powder is bidirectionally pressed to obtain a pressed cold pressed green body;

[0067] The cold pressed green body is sintered at a temperature of 900° C. for 6 min. After sintering, the green body is cooled for 1 h. After cooling, multi-layer diamond beads are obtained.

[0068] The diamond beads prepared by the preparation method in the prior art are used as comparative example 1, and the cutting performance is tested with the diamond beads obtained in the present embodiment 1. In this test process, the diamond beads of the present embodiment 1 and the comparative example 1 are mainly used to cut the granite mine. The size difference of the large and small ends in the test data is the statistical result of measuring the difference between the large end and the small end of 50 beads after the rope saw is scrapped. The specific data is shown in Table 1:

[0069] Table 1

[0070] Head size difference Cutting efficiency Service life Example 1 0.11-0.32mm 12-18㎡ / h 16-18㎡ / m Comparative Example 1 0.52-1.26mm 11-16㎡ / h 10-16㎡ / m

[0071] Compared with the diamond beads prepared by the preparation method in the prior art, the diamond beads prepared by the present application have significantly improved the problem of large and small heads, and the cutting efficiency and cutting life of the diamond beads have been significantly improved. Therefore, compared with the existing diamond beads, the performance of the diamond beads prepared by the present application has been significantly improved.

[0072] The diamond beads provided in the present application are produced by adopting the preparation method.

[0073] The present application performs a cold pressing process after filling a first powder, a second powder and a third powder with different diamond concentrations. During the filling process, it is ensured that the diamond concentration of the filled first powder and the third powder is higher than the diamond concentration of the second powder. The diamond beads are divided into several sections along the axial direction, and then the diamond concentration of each section of the diamond beads is controlled according to the degree of the size of the diamond beads, so that the diamond concentration of the small head is high and the diamond concentration of the large head is low. The diamond concentration in the diamond beads is adjusted according to actual needs, thereby changing the uniformity of the diamond beads during cutting and the size problem caused by inconsistent wear before and after. The distribution of diamonds is controlled by filling powders with multiple diamond concentrations for multiple times, thereby improving the service life of the diamond beads.

[0074] It should be understood that, although the various steps in the flowcharts in the above-described embodiments are sequentially displayed according to the indications of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and they can be executed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily to be carried out sequentially, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0075] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0076] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for preparing multi-layer diamond beads, characterized in that: The following steps are involved: S1. Prepare at least three powders with different diamond concentrations, the powders comprising: a first powder, a second powder and a third powder; Wherein, the diamond concentration in the second powder is less than the diamond concentration in the first powder and the third powder; The first powder, the second powder and the third powder have the same composition and only have different diamond concentrations; The diamond concentration in the first powder is 30%-40%, the diamond concentration in the second powder is 10%-15%, and the diamond concentration in the third powder is 15%-30%; S2, filling the first powder, the second powder and the third powder in sequence, and after the filling is completed, cold pressing the filled powder to obtain a cold pressed green body; Filling a fourth powder at least once between the first powder and the second powder, wherein the diamond concentration in the fourth powder is not lower than the diamond concentration in the second powder, and the diamond concentration in the fourth powder is not higher than the diamond concentration in the first powder, and the diamond concentration in the fourth powder is 10%-40%; Filling the fifth powder at least once between the second powder and the third powder, the diamond concentration of the fifth powder is not lower than the diamond concentration in the second powder, and the diamond concentration in the fifth powder is not higher than the diamond concentration in the third powder, and the diamond concentration of the fifth powder is 10%-30%; S3, sintering the cold pressed green body at a temperature of 800-1100° C. for 1-6 min, and obtaining multi-layer diamond beads after cooling.

2. The preparation method according to claim 1, characterized in that: The compression ratio of the cold pressed blank during cold pressing is controlled between 2-3.

Images