MOX simulant powder forming press method

Abstract

The present application relates to the technical field of MOX fuel production, and particularly discloses a MOX simulation powder forming and pressing method for forming and pressing the granulated powder, which comprises the following steps: step one: adjusting the forming and pressing parameters according to the granularity of the granulated powder; step two: filling the granulated powder into a pressing mold to obtain a green body through forming and pressing; step three: the green body after completing the pressing enters a demolding procedure; and step four: after the demolding is completed, the appearance, density and strength of the green body are detected according to the technical conditions of the MOX simulation green body, and whether the green body meets the requirements is detected. The method can effectively improve the forming and pressing effect and improve the qualified rate of the green body.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of MOX fuel production, and particularly relates to a MOX simulation powder forming and pressing method. BACKGROUND

[0002] As a key step in the production and manufacturing of MOX fuel, forming and pressing plays a crucial role in the qualification rate of MOX fuel. The existing forming and pressing technology is to directly press the powder after one-time filling. In this process, the filling state of the powder is uncontrollable to some extent, and the green bodies obtained by pressing the powder in the same batch have certain differences, which significantly affects continuous and stable production. Moreover, the green bodies obtained by pressing using this method have differences in strength, density, appearance, and the like due to different powder filling states, and even unqualified situations occur, resulting in a reduced qualification rate of the green bodies.

[0003] Therefore, it is urgent to propose a new forming and pressing method to optimize the forming and pressing process of MOX simulation powder and improve the qualification rate. SUMMARY

[0004] The purpose of the application is to provide a MOX simulation powder forming and pressing method, which can effectively improve the qualification rate of the green bodies.

[0005] The technical scheme of the application is as follows:

[0006] A MOX simulation powder forming and pressing method for pressing and forming the powder after granulation, comprising the following steps:

[0007] Step one: adjusting the forming and pressing parameters according to the particle size of the powder after granulation;

[0008] Step two: filling the powder after granulation into a pressing mold to perform forming and pressing to obtain a green body;

[0009] Step three: the green body after completing the pressing enters a demolding program;

[0010] Step four: after the demolding is completed, detecting the appearance, density, and strength of the green body according to the MOX simulation green body technical conditions to detect whether the green body meets the requirements.

[0011] In step one, the particle size = 80-mesh particle weight ratio x 100, wherein:

[0012] When the particle size ∈ [0, 30], the filling depth is controlled to be 10-17 mm, the pressing pressure is controlled to be 60-90 KN, and the pressure holding time is controlled to be 1-2 s;

[0013] When the particle size ∈ (30, 45], the filling depth is controlled to be 20-45 mm, the pressing pressure is controlled to be 85-120 KN, and the pressure holding time is controlled to be 1-3 s;

[0014] Particle size ∈(45, 70], control the filling depth 20-36mm, pressing pressure 90-150KN, holding time 1-2.8s;

[0015] Particle size >70, control the filling depth 14-31mm, pressing pressure 90-190KN, holding time 3-4s.

[0016] In step two, the granulated powder is filled into the pressing mold in small amount first, so as to cover the bottom surface of the mold;

[0017] Then the remaining powder is slowly filled into the pressing mold, and the green body is obtained by molding and pressing.

[0018] In step two, the amount of single filling is controlled in 0.4-2g.

[0019] In step two, the pressing pressure is controlled to be stable during the molding and pressing, and the pressure fluctuation range is ≤±0.2KN.

[0020] In step three, the demolding pressure is controlled in 2-5KN during the demolding process.

[0021] In step four, if the green body index deviates from the technical conditions, the parameters are moderately adjusted within the control range according to the deviation direction.

[0022] The qualified rate of the green body reaches more than 85%.

[0023] The significant effect of the present application is that:

[0024] (1) The MOX simulation powder after granulation is pressed by the method of the present application to obtain the MOX simulation green body meeting the product requirements; the qualified rate of the green body reaches more than 85% after inspection, which effectively improves the qualified rate of the green body after molding and pressing, indicating that the molding and pressing method of the present application can effectively improve the molding and pressing effect and improve the qualified rate of the green body.

[0025] (2) The method of the present application has been applied to the MOX production line simulation material test process, and the effect is good after implementation verification, and the performance of the obtained green body is excellent, meeting the test requirements. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in combination with specific embodiments.

[0027] A molding and pressing method of MOX simulation powder, which is used for molding and pressing the granulated powder, comprising the following steps:

[0028] Step one: according to the particle size of the powder after granulation, that is, the weight ratio of particles above 80 mesh, the molding and pressing parameters are adjusted, and the particle size = weight ratio of particles above 80 mesh × 100, wherein:

[0029] Particle size ∈ [0, 30], control the filling depth 10-17mm, pressing pressure 60-90KN, holding time 1-2s;

[0030] Particle size ∈ (30, 45], control the filling depth 20-45mm, pressing pressure 85-120KN, holding time 1-3s;

[0031] Particle size ∈ (45, 70], control the filling depth 20-36mm, pressing pressure 90-150KN, holding time 1-2.8s;

[0032] Particle size >70, control the filling depth 14-31mm, pressing pressure 90-190KN, holding time 3-4s;

[0033] Step two: the granulated powder is first filled into the pressing mold in a small amount to cover the bottom surface of the mold; then the remaining powder is slowly filled into the pressing mold, and the single filling amount is controlled at 0.4-2g, and the green body is obtained by forming and pressing;

[0034] The pressing pressure is controlled to be stable during the forming and pressing, and the pressure fluctuation range is ≤±0.2KN;

[0035] Step three: the green body after completing the pressing enters the demolding program, and the demolding process controls the demolding pressure at 2-5KN;

[0036] Step four: after the demolding is completed, the appearance, density, strength and the like of the green body are detected according to the MOX simulated green body technical conditions, and whether it meets the requirements is detected;

[0037] If the green body index deviates from the technical conditions, the parameters are moderately adjusted within the control range according to the deviation direction.

[0038] Example 1

[0039] A MOX simulated powder forming and pressing method, comprising the following steps:

[0040] Step one: the granulated powder with a particle weight ratio of 27.33% and a particle size of 27.33 is selected, the forming and pressing parameters are adjusted, the filling depth is controlled at 16mm, the pressing pressure is 75KN, and the holding time is 1s;

[0041] Step two: the granulated powder is first filled into the pressing mold in a small amount to cover the bottom surface of the mold; then the remaining powder is slowly filled into the pressing mold, and the single filling amount is controlled at about 0.8g, and the green body is obtained by forming and pressing, and the pressing pressure is controlled to be stable during the forming and pressing, and the pressure fluctuation range is 0-0.06KN;

[0042] Step three: After the green body is completed, the demolding program is entered, and the demolding pressure is controlled to be 2.7KN during the demolding process;

[0043] Step four: After the pressing is completed, the appearance morphology and density of the green body are detected, and the detection results meet the requirements.

[0044] Example 2

[0045] A MOX simulation powder forming and pressing method, comprising the following steps:

[0046] Step one: select the granulated powder with a particle size of 36.12% and a particle weight ratio of 36.12% above 80 mesh, adjust the forming and pressing parameters, control the filling depth to be 28mm, the pressing pressure to be 90KN, and the pressure holding time to be 1.7s;

[0047] Step two: fill the granulated powder into the pressing mold in a small amount first to cover the bottom surface of the mold, then slowly fill the remaining powder into the pressing mold, control the single filling amount to be in the range of 1.0-1.2g, and perform forming and pressing to obtain a green body, and control the pressing pressure to be stable during the forming and pressing, and the pressure fluctuation range is ≤±0.1KN;

[0048] Step three: After the green body is completed, the demolding program is entered, and the demolding pressure is controlled to be 2.2KN during the demolding process;

[0049] Step four: After the pressing is completed, the appearance morphology and density of the green body are detected, and the detection results meet the requirements.

[0050] Example 3

[0051] A MOX simulation powder forming and pressing method, comprising the following steps:

[0052] Step one: select the granulated powder with a particle size of 56.82% and a particle weight ratio of 56.82% above 80 mesh, adjust the forming and pressing parameters, control the filling depth to be 32mm, the pressing pressure to be 120KN, and the pressure holding time to be 2.4s;

[0053] Step two: fill the granulated powder into the pressing mold in a small amount first to cover the bottom surface of the mold, then slowly fill the remaining powder into the pressing mold, control the single filling amount to be about 1.5g, and perform forming and pressing to obtain a green body, and control the pressing pressure to be stable during the forming and pressing, and the pressure fluctuation range is-0.01-0.02KN;

[0054] Step three: After the green body is completed, the demolding program is entered, and the demolding pressure is controlled to be 3.7KN during the demolding process;

[0055] Step four: After the pressing is completed, the appearance morphology and density of the green body are detected, and the detection results meet the requirements.

[0056] Example 4

[0057] A MOX simulation powder forming and pressing method, comprising the following steps:

[0058] Step one: select the granulated powder with particle size of 72.03% and above 80 mesh, adjust the forming and pressing parameters, control the filling depth of 30mm, the pressing pressure of 150KN, and the pressure holding time of 3.4s;

[0059] Step two: fill the granulated powder into the pressing mold in small amount, cover the bottom surface of the mold, then slowly fill the remaining powder into the pressing mold, control the single filling amount of about 1.8g, and perform the forming and pressing to obtain the green body, control the pressing pressure to be stable during the forming and pressing, and the pressure fluctuation range is-0.03~0.04KN;

[0060] Step three: after the green body is completed, the demolding program is entered, and the demolding pressure is controlled to be 3.2KN during the demolding process;

[0061] Step four: after the pressing is completed, the appearance and density of the green body are detected, and the detection results meet the requirements.

[0062] The above shows and describes the basic principles, main features and advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0063] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A MOX simulated powder molding and pressing method, characterized in that: The method is used to press the granulated powder into a mold, comprising the following steps: Step 1: Adjust the molding and pressing parameters according to the different particle sizes of the powder after granulation; Step 2: Filling the granulated powder into a pressing mold and performing molding and pressing to obtain a green body; Step 3: After the pressing is completed, the green body enters the demoulding process; Step 4: After demolding, the appearance, density, strength, etc. of the green body are tested according to the MOX simulated green body technical conditions to check whether it meets the requirements; In step 1, particle size = weight ratio of particles larger than 80 mesh × 100, where: Particle size∈[0,30], control the filling depth to 10~17mm, pressing pressure to 60~90KN, and holding time to 1~2s; Particle size∈(30,45], control the filling depth to 20~45mm, pressing pressure to 85~120KN, holding time to 1~3s; Particle size∈(45,70], control the filling depth to 20~36mm, pressing pressure to 90~150KN, holding time to 1~2.8s; Particle size>70, control the filling depth to 14-31mm, pressing pressure to 90-190KN, and holding time to 3-4s.

2. A MOX simulated powder molding and pressing method according to claim 1, characterized in that: In step 2, a small amount of the granulated powder is first filled into the pressing mold to cover the bottom surface of the mold; The remaining powder is then slowly filled into a pressing mold and pressed to obtain a green body.

3. A MOX simulated powder molding and pressing method according to claim 2, characterized in that: In step 2, the single filler amount is controlled to be 0.4 to 2 g.

4. A MOX simulated powder molding and pressing method according to claim 1, characterized in that: In step 2, the pressing pressure is controlled to remain stable during the forming pressing process, and the pressure fluctuation range is ≤±0.2KN.

5. The MOX simulated powder molding and pressing method according to claim 1, wherein: In step 3, the demoulding process controls the demoulding pressure to 2 to 5 kN.