Method for uniformly mixing hard alloy mixed powder

Abstract

The invention discloses a method for uniformly mixing hard alloy mixed powder, which is characterized in that mixing equipment applied by the method is a spiral mixer, the spiral mixer comprises a material containing groove and a spiral blade horizontally penetrating through the material containing groove, a charging hole is formed above the material containing groove, and a discharging hole is formed below the material containing groove; the device further comprises a square forming agent storage device arranged above the spiral mixer, the square forming agent storage device is communicated with the charging opening, and 10-30 round holes capable of being opened and closed and with the diameter phi of 2-6 are formed in the bottom of the square forming agent storage device. By controlling the adding time and the mixing time of the forming agent, higher quality guarantee is provided for compression forming of the special-shaped product.

Description

Technical Field

[0001] The invention relates to the technical field of cemented carbide manufacturing, in particular to a method for uniformly mixing cemented carbide mixed powder. Background Art

[0002] The existing method will cause serious uneven distribution in the initial stage, the addition speed is uncontrolled, and it is easy to obtain uneven powder, which affects the pressing and molding.

[0003] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] In view of the above existing defects, the present invention aims to provide a method for uniformly mixing cemented carbide mixed powder. By controlling the time of adding and mixing the molding agent, the pressing and molding of the special-shaped product can be more highly guaranteed.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for uniformly mixing a cemented carbide mixed powder, wherein the mixing device used in the method is a spiral mixer, wherein the spiral mixer comprises a material storage tank and a spiral blade horizontally penetrating the material storage tank, wherein a loading port is arranged above the material storage tank, and a discharge port is arranged below the material storage tank, and further comprises a square forming agent storage device above the spiral mixer, wherein the square forming agent storage device is connected to the loading port, and wherein 10 to 30 φ2 to φ6 openable and closable circular holes are arranged at the bottom of the square forming agent storage device;

[0007] The method comprises the following steps:

[0008] Step 1, putting the cemented carbide mixture into a spiral mixer;

[0009] Step 2: Start the spiral blade of the spiral mixer to start mixing.

[0010] Step 3, open the round hole of the square forming agent storage device, start mixing the mixed material and the forming agent, and add the forming agent into the mixed material according to the set flow rate and time;

[0011] Step 4: When the set mixing time is over, the spiral mixer stops running, the square forming agent storage device is removed, and the evenly mixed mixture is discharged and transferred to the next process.

[0012] Furthermore, during the mixing process, the spiral mixer is set to run alternately in forward and reverse directions every 20 to 30 seconds.

[0013] Furthermore, the molding agent is continuously added for no less than 1 minute.

[0014] Furthermore, the mixing time is not less than 2 minutes and not more than 15 minutes.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention is suitable for mixtures that need to be mixed with molding agents, especially for the compression molding of special-shaped products with higher quality assurance. In order to make the molding agent evenly mixed in the mixture, the addition speed must be controlled to ensure that the molding agent is continuously added for no less than 1 minute and the mixing time is no less than 2 minutes. If the time is too short, the molding agent is not evenly mixed in the mixture, and if the time is too long, the mixture becomes hard and the compression performance is poor. The square molding agent storage device adds the molding agent to the mixture at a set flow rate at a specified time through multiple tests.

[0017] The invention has continuous operation and high efficiency; it saves labor cost and reduces dependence on manpower; and the mixed material is more uniform and has higher and more stable quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : A schematic diagram of the structure of the spiral mixer of the present invention;

[0019] In the figure, 1- loading port; 2- material trough; 3- spiral blade; 4- unloading port. DETAILED DESCRIPTION

[0020] In order to explain the technical content, purpose and effect of the present invention in detail, the following is explained in combination with embodiments and accompanying drawings. In the description of this embodiment, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present embodiment 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 cannot be understood as a limitation of the present invention.

[0021] Example 1

[0022] A method for uniformly mixing a cemented carbide mixed powder, wherein the mixing device used in the method is a spiral mixer, wherein the spiral mixer comprises a material tank 2 and a spiral blade 3 horizontally penetrating the material tank 2, wherein a charging port 1 is arranged above the material tank 2, and a discharge port 4 is arranged below the material tank 2, and further comprises a square molding agent storage device above the spiral mixer, wherein the square molding agent storage device is connected to the charging port 1, and wherein 10 φ20mm openable and closable circular holes are arranged at the bottom of the square molding agent storage device for adjusting the adding speed of the molding agent;

[0023] The method comprises the following steps:

[0024] Step 1, putting the cemented carbide mixture into a spiral mixer, wherein the cemented carbide is 3000g of 300-mesh YG10 cemented carbide powder;

[0025] Step 2: Start the spiral blade 3 of the spiral mixer to start mixing.

[0026] Step 3, adjusting the number of open round holes of the square forming agent storage device, and adding the forming agent into the cemented carbide powder at a flow rate of 1 g / s and a time of 100 s;

[0027] Step 4: Set the mixing time to 200s. After the mixing time is over, stop the spiral mixer, remove the square forming agent storage device, and transfer the evenly mixed mixture to the next process.

[0028] In this embodiment, the square forming agent is paraffin, the amount is 100g, and the side length of the square forming agent is 1mm.

[0029] In this embodiment, during the mixing process, the spiral mixer is set to run alternately in forward and reverse rotations every 20 seconds.

[0030] Example 2

[0031] A method for uniformly mixing a cemented carbide mixed powder, wherein the mixing device used in the method is a spiral mixer, wherein the spiral mixer comprises a material tank 2 and a spiral blade 3 horizontally penetrating the material tank 2, wherein a charging port 1 is arranged above the material tank 2, and a discharge port 4 is arranged below the material tank 2, and further comprises a square molding agent storage device above the spiral mixer, wherein the square molding agent storage device is connected to the charging port 1, and wherein 30 φ60mm openable and closable circular holes are arranged at the bottom of the square molding agent storage device for adjusting the adding speed of the molding agent;

[0032] The method comprises the following steps:

[0033] Step 1, putting the cemented carbide mixture into a spiral mixer, wherein the cemented carbide is 3000g of 300-mesh YG10 cemented carbide powder;

[0034] Step 2: Start the spiral blade 3 of the spiral mixer to start mixing.

[0035] Step 3, adjusting the number of open round holes of the square forming agent storage device, and adding the forming agent into the cemented carbide powder at a flow rate of 1 g / s and a time of 100 s;

[0036] Step 4: Set the mixing time to 200s. After the mixing time is over, stop the spiral mixer, remove the square forming agent storage device, and transfer the evenly mixed mixture to the next process.

[0037] In this embodiment, the square forming agent is PEG (polyethylene glycol), the dosage is 100g, and the side length of the square forming agent is 3mm.

[0038] In this embodiment, during the mixing process, the spiral mixer is set to run alternately in forward and reverse directions every 30 seconds.

[0039] Example 3

[0040] A method for uniformly mixing a cemented carbide mixed powder, wherein the mixing device used in the method is a spiral mixer, wherein the spiral mixer comprises a material tank 2 and a spiral blade 3 horizontally penetrating the material tank 2, wherein a charging port 1 is arranged above the material tank 2, and a discharge port 4 is arranged below the material tank 2, and further comprises a square molding agent storage device above the spiral mixer, wherein the square molding agent storage device is connected to the charging port 1, and wherein 20 φ40mm openable and closable circular holes are arranged at the bottom of the square molding agent storage device for adjusting the adding speed of the molding agent;

[0041] The method comprises the following steps:

[0042] Step 1, putting the cemented carbide mixture into a spiral mixer, wherein the cemented carbide is 3000g of 300-mesh YG10 cemented carbide powder;

[0043] Step 2: Start the spiral blade 3 of the spiral mixer to start mixing.

[0044] Step 3, adjusting the number of open round holes of the square forming agent storage device, and adding the forming agent into the cemented carbide powder at a flow rate of 1 g / s and a time of 100 s;

[0045] Step 4: Set the mixing time to 200s. After the mixing time is over, stop the spiral mixer, remove the square forming agent storage device, and transfer the evenly mixed mixture to the next process.

[0046] In this embodiment, the square molding agent is 100g of rubber, and the side length of the square molding agent is 2mm.

[0047] In this embodiment, during the mixing process, the spiral mixer is set to run alternately in forward and reverse directions every 25 seconds.

[0048] Experimental example

[0049] The mixtures prepared in Examples 1 to 3 were made into conical cylindrical products of various sizes, and the multi-dimensional hardness, strength and grain size of the products were tested. The results are shown in the following table:

[0050] sample Hardness HRC StrengthMpa Grain size μm Example 1 91±0.5 3342±2 1.2±0.1 Example 2 90.5±0.5 3282±2 1.2±0.1 Example 3 91±0.5 3390±2 1.2±0.1

[0051] From the hardness, strength and grain size error range of each dimension in the experiment, it can be seen that the mixed material is highly uniform when the method of the present invention is used for mixing.

[0052] The present invention is suitable for mixtures that need to be mixed with molding agents, especially for the compression molding of special-shaped products with higher quality assurance. In order to make the molding agent evenly mixed in the mixture, the addition speed must be controlled to ensure that the molding agent is continuously added for no less than 1 minute and the mixing time is no less than 2 minutes. If the time is too short, the molding agent is not evenly mixed in the mixture, and if the time is too long, the mixture becomes hard and the compression performance is poor. The square molding agent storage device adds the molding agent to the mixture at a set flow rate at a specified time through multiple tests.

[0053] The mixing method of the present invention has the advantages of continuous operation and high efficiency; it saves labor cost and reduces dependence on manpower; and the mixed material is more uniform and has higher and more stable quality.

[0054] Although the present invention has been described in detail above with specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for uniformly mixing a cemented carbide mixed powder, characterized in that: The mixing equipment used in the method is a spiral mixer, which includes a material tank and a spiral blade horizontally penetrating the material tank, a loading port is arranged above the material tank, a discharge port is arranged below the material tank, and a square molding agent storage device is arranged above the spiral mixer, the square molding agent storage device is connected to the loading port, and 10 to 30 φ2 to φ6 round holes that can be opened and closed are arranged at the bottom of the square molding agent storage device; The method comprises the following steps: Step 1, putting the cemented carbide mixture into a spiral mixer; Step 2: Start the spiral blade of the spiral mixer to start mixing. Step 3, open the round hole of the square forming agent storage device, start mixing the mixed material and the forming agent, and add the forming agent into the mixed material according to the set flow rate and time; Step 4: When the set mixing time is over, the spiral mixer stops running, the square forming agent storage device is removed, and the evenly mixed mixture is discharged and transferred to the next process.

2. The method for uniformly mixing a cemented carbide mixed powder according to claim 1, characterized in that: During the mixing process, the spiral mixer is set to run alternately in forward and reverse directions every 20 to 30 seconds.

3. The method for uniformly mixing a cemented carbide mixed powder according to claim 1, characterized in that: The continuous addition time of the molding agent shall not be less than 1 minute.

4. The method for uniformly mixing a cemented carbide mixed powder according to claim 1, characterized in that: The mixing time should be no less than 2 minutes and no more than 15 minutes.

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