KR101009927B1 - A measure equipment for flow rate and apparent density of metal powder and method for measuring flow rate and apparent desity of metal powder - Google Patents

Abstract

The present invention is capable of measuring the fluidity of the metal powder having low fluidity by using vibration, and measuring the fluidity and the apparent density of the metal powder so that the apparent density can be measured by placing the metal powder dropped in the container when the fluidity is measured. It is about.

The flow rate and apparent density measuring apparatus 100 of the metal powder according to the present invention includes a charging container 110 into which a metal powder having a particle size of 1 nm to 1 mm is loaded, and the charging container 110 at a predetermined height. The support 120 to maintain, the vibrator 130 to provide a vibration to the support 120, the vibration barrier 140 to block the vibration generated from the vibrator 130 to be transmitted to the ground, and the charging container It is configured to include an apparent density measuring sphere 150 for collecting the metal powder falling from the (110). According to the present invention, it is possible to measure the flow rate and the apparent density of the metal powder at the same time, there is an advantage that the ease of use is improved and the measurement time is significantly reduced.

Metal powder, fluidity, apparent density, correction factor, vibration

Description

 A measure equipment for flow rate and apparent density of metal powder and method for measuring flow rate and apparent desity of metal powder

1 is a block diagram showing an apparatus for measuring the fluidity and apparent density of a metal powder employing a preferred embodiment of the present invention.

Figure 2 is a flow chart showing the flow rate and the apparent density measurement method using the flow rate and apparent density measuring apparatus of the metal powder according to the present invention.

Figure 3 is a flow chart showing in detail the measurement step, one step in the flow and apparent density measurement method according to the present invention.

Figure 4 is a table comparing the measured values of the Examples and Comparative Examples measured by using the fluidity and apparent density measuring device of the metal powder according to the present invention.

Explanation of symbols on the main parts of the drawings

100. Flow rate and apparent density measuring device 110. Charging container

112. Charging space 114. Hole

120. Support 122. Support

124. Height adjustment 126. Base

130. Vibrator 140. Dustproof port

150. Apparent density measuring instrument 152. Apparent density measuring vessel

154. Container Support 156. Collection

160. Opening and closing door 162. Shielding plate

164. Elastic members 166. Release button

168. Body 170.Work Table

S100. Equipment setting step S200. Vibration generation stage

S300. Container opening step S400. Measurement stage

S410. Flow Measurement Process S420. Flow Correction Factor Calculation Process

S430. Flow conversion process S450. Apparent density measurement process

S460. Calculation of apparent density correction factor S470. Apparent Density Conversion Process

 α. Fluidity correction factor β. Apparent Density Correction Factor

According to the present invention, it is possible to measure the fluidity of the metal powder having low fluidity by using vibration, and at the same time, the metal powder dropped in the measurement of fluidity in a certain container so that the apparent density can be measured to improve the convenience of use. It relates to a device for measuring the flow rate and the apparent density of.

The flow rate is defined as the time taken for a certain amount (50 g) of powder to pass through a constant funnel under atmospheric pressure, and is a process factor that greatly affects productivity in a metal powder molding compression process such as sinter molding.

Therefore, the flow rate of the metal powder must be measured prior to the design of the mold to form the metal powder.

That is, since the flow rate of the metal powder is directly related to the time to fill the inside of the mold at the time of molding, the flow rate of the metal powder acts as a large variable in the productivity of the product.

In addition, in the rolling process of rolling a metal powder to manufacture a plate, etc., the filling amount of the metal powder per hour must be kept constant in order to enable automation.

That is, the flow rate of the metal powder has a different aspect according to the mutual frictional force between the particles such as the apparent density and the shape of the powder, so that the metal powder using the rolling apparatus without the flow measurement of the metal powder is not preceded. When the molding is carried out, the filling amount of the metal powder is not constant, so that an error such as a non-uniform thickness of the sheet or a failure of filling itself may occur during rolling, so the flow rate measurement of the metal powder is important.

Accordingly, the conventional metal powder flow measurement apparatus is composed of a correction funnel having a hole diameter of 2.5 mm and a support according to the technical standard (KS D 0035, ASTM B 213-03).

However, according to the shape of the metal powder (plate shape, irregular shape, etc.), particle size and particle size distribution, the frictional force between the particles is different from each other. There is a problem that can not be measured.

On the other hand, the apparent density is defined as the mass per unit volume when the powder is filled by the method specified in a certain container.

This apparent density is measured by using a measuring device with a funnel having a hole diameter of 2.5 mm or 5 mm to measure the apparent density of the metal powder collected. (KS D ISO 3923-1)

However, since the apparent density measuring device is unable to measure the apparent density in the case of metal powder, which has a low fluidity and is not easily dropped from the funnel, another device for measuring the apparent density (KS D ISO 3923-1) Hassle has to be used.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an apparatus for measuring the fluidity and apparent density of a metal powder that enables the measurement of the fluidity of a metal powder having low fluidity using vibration.

Another object of the present invention is to provide an apparatus for measuring the fluidity and apparent density of a metal powder, which allows the flow rate of the metal powder to be measured more accurately by calculating a correction coefficient through a comparative test with a reference powder.

Another object of the present invention is to provide an apparent density measuring instrument on one side, the metal powder which allows the flow and apparent density to be measured simultaneously by measuring the apparent density of the metal powder collected in a container by dropping at the time of measuring the fluidity. An object of the present invention is to provide an apparatus for measuring the fluidity and the apparent density of.

An apparatus for measuring the fluidity and apparent density of a metal powder according to the present invention includes a charging container into which a metal powder having a particle size of 1 nm to 1 mm is loaded, a support for holding the charging container at a constant height, and a vibration in the support. It is characterized in that it comprises a vibrator for providing, a dustproof block for blocking the vibration generated in the vibrator is not transmitted to the ground, and the apparent density measuring sphere for collecting the metal powder falling from the charging container.

The vibration provided on the support is characterized in that it is transmitted to the charging container.

One side of the charging container, it characterized in that the opening and closing port for selectively opening the lower portion of the charging space inside the charging container is provided.

The apparent density measuring sphere is characterized in that spaced apart from the vibrator.

The apparent density measuring sphere includes an apparent density measuring container, a container support for supporting the load of the apparent density measuring container and the metal powder, and a collecting part for collecting metal powder which is disposed under the measuring container and dropped out of the measuring container. Characterized in that configured.

The vibrator is characterized in that it has an excitation force of 5 ~ 50kg, frequency 50 ~ 60Hz, frequency 3000 ~ 3600VPM.

Flow rate and apparent density measurement method using the flow rate and apparent density measuring device of the metal powder according to the present invention, the equipment setting step of charging the metal powder in the charging container, the apparent density measuring vessel spaced below the charging container And a vibration generating step of operating a vibrator to transmit vibration to the charging container, opening a container to open one side of the charging container to drop the metal powder, and measuring the fluidity and apparent density of the metal powder. Characterized in that the measuring step.

The measuring step may include a flow rate measuring process for measuring a time for discharging all of the metal powder in the charging container, and collecting a metal powder discharged from the charging container in an apparent density measuring container to measure mass per unit volume. Characterized in that it comprises a measurement process.

After the flow measurement process, the flow correction coefficient calculation process of calculating the flow correction coefficient by comparing the flow of the metal powder measured without the operation of the vibrator, and the flow of the metal powder measured by operating the vibrator And a flow rate conversion process of calculating a flow rate using the flow rate and the flow rate correction coefficient of the metal powder measured by operating the vibrator.

After the apparent density measurement process, a density correction coefficient calculation process of calculating the apparent density correction coefficient by comparing the apparent density of the metal powder measured without operating the vibrator and the apparent density of the metal powder measured by operating the vibrator And an apparent density conversion process of calculating the apparent density using the apparent density and the apparent density correction coefficient of the metal powder measured by operating the vibrator.

In the equipment setting step, the lower end of the charging container and the upper end of the apparent density measuring container is characterized in that spaced 25mm apart.

Hereinafter, with reference to the accompanying Figure 1 will be described in detail the configuration of the fluidity and apparent density measuring device (hereinafter referred to as "measurement apparatus 100") of the metal powder according to the present invention.

1 is a block diagram showing an apparatus for measuring the fluidity and apparent density of a metal powder employing a preferred embodiment of the present invention.

As shown in the drawing, the measuring device 100 according to the present invention is configured to measure the flow rate and the apparent density of the metal powder at the same time. It is configured to be possible.

To this end, the measuring device 100 includes a charging container 110 into which metal powder is charged, a support 120 holding the charging container 110 at a predetermined height, and a vibrator providing vibration to the support 120. 130, a dustproof opening 140 for blocking the vibration generated from the vibrator 130 from being transmitted to the ground, and an apparent density measuring port 150 for collecting metal powder falling from the charging container 110. It is configured to include.

The charging container 110 is a charging space 112 is formed inside it is possible to charge the metal powder, the charging space 112 is a lower end portion of the charging space 112 and the hole 114 to communicate with the outside Is formed. The hole 114 is configured to have a diameter of 2.5 mm or 5.0 mm.

In addition, the charging space 112 is formed such that the cross-sectional area is reduced toward the bottom has a funnel (funnel) shape.

The lower portion of the charging container 110 is provided with an opening and closing hole 160. The opening and closing hole 160 is configured to selectively open the hole 114 to allow the metal powder to fall down through the hole 114.

To this end, the opening and closing hole 160 is a shielding plate 162 for selectively shielding the hole 114 by sliding left and right, an elastic member 164 for providing an elastic restoring force to the shielding plate 162, and And a release button 166 selectively canceling the restraint of the shield plate 162 and a body 168 for receiving the elastic member 164 and guiding the sliding direction of the shield plate 162.

Therefore, if the movement of the shield plate 162 is restricted by the release button 166 while the elastic member 164 maintains the elastic restoring force while the shield plate 162 shields the hole 114, the user By pressing the release button 166 to remove the restraining force on the shield plate 162 by sliding the shield plate 162 by the elastic restoring force of the elastic member 164 to open the hole 114 in the downward direction. do.

The opening and closing hole 160 is for improving the flow rate of the metal powder into the charging container 110 in the state of conventionally blocked by hand, and removes the hand from the hole 114.

The opening and closing hole 160 is supported by a load while maintaining a predetermined height by the support (120). In addition, the support 120 is configured to enable height adjustment of the charging container 110.

To this end, the supporter 120 is vertically supported by the support part 122 and the support part 122 protrudes in the right direction to be combined with the charging container 110 and up / down in the longitudinal direction of the support part 122 It is configured to include a height adjusting portion 124 to allow the height adjustment of the charging container 110 and the support portion 126 coupled to and supported by the lower end of the support portion 122.

The measuring device 100 is further provided with a vibrator (130). The vibrator 130 is configured to provide vibration to the charging container 110 to allow the metal powder to fall more easily through the hole 114.

Therefore, the vibrator 130 may be installed at various positions within the range for transmitting vibration to the charging container 110, and in the embodiment of the present invention, the vibrator 130 is configured on the upper surface of the support part 126, and the excitation force 5 to It was configured to have 50kg, frequency 50 ~ 60Hz, frequency 3000 ~ 3600VPM.

That is, when the vibrator 130 operates to generate vibrations, the vibrations are sequentially transmitted to the support part 126, the support part 122, and the height adjusting part 124 to reach the charging container 110. It becomes possible.

The dustproof part 140 is provided below the support part 126. The vibration isolator 140 serves to block the vibration generated from the vibrator 130 to be transmitted to the lower side, that is, the ground.

Therefore, it is preferable that the bottom surface of the dustproof port 140 is configured to be in contact with the bottom, and even if the bottom surface of the work table 170 for supporting the support portion 126 in the upward direction as in the embodiment of the present invention. It's okay.

By the configuration as described above it is possible to measure the flow rate of the metal powder, and the configuration of the apparent density measuring sphere 150 will be described in detail below.

First, the apparent density measuring sphere 150 is installed so that vibration generated from the vibrator 130 is not transmitted, and supports the apparent density measuring container 152, the apparent density measuring container 152, and the load of the metal powder. It includes a container support 154 and the collecting unit 156 which is located below the measuring container 152 to collect the metal powder dropped to the outside of the measuring container 152.

Therefore, the apparent density measuring container 152 is a transparent cylindrical cup is applied, is supported by the container support 154 is located in the space between the charging container 110 and the vibrator 130.

The apparent density measuring container 152 is supported by the container support 154 in a state accommodated in the collecting unit 156. This is to make it possible to use the scattered metal powder during the retest while falling downward through the hole 114.

Therefore, the metal powder collected inside the collection unit 156 is collected in a container (not shown), etc., and then reused when the fluidity test is repeated later.

Hereinafter, a measuring method using the fluidity and apparent density measuring apparatus 100 of the metal powder according to the present invention will be described with reference to FIG. 2.

Figure 2 is a flow chart showing the flow rate and the apparent density measurement method using the fluidity and apparent density measurement apparatus of the metal powder according to the present invention.

As shown in the drawing, the measuring method according to the present invention, charging the metal powder in the charging container 110, and the equipment setting step (S100) and spaced apart from the apparent container measuring density 152 below the charging container (110) and Vibration generation step (S200) for operating the vibrator 130 so that the vibration is transmitted to the charging container 110, and opening the container (S300) to drop the metal powder by opening one side of the charging container (110). And, it consists of a measuring step (S400) for measuring the fluidity and apparent density of the metal powder.

In the equipment setting step (S100), the hole 114 is maintained in a shielded state by the shielding plate 162, and the metal powder is charged into the charging space 112 when the hole 114 is shielded.

Then, in order to measure the apparent density of the metal powder, the upper end of the apparent density measuring container 152 is a lower end of the charging container 110 so that the separation distance d is 25 mm.

To this end, the height adjustment unit 124 is slidingly adjusted in the longitudinal direction of the support 122.

In addition, the apparent density measuring sphere 150 is set to maintain a state spaced apart from the charging container 110, the support 120, the vibrator 130 and the work table 170.

When the equipment setting step (S100) is completed, the vibration is generated by applying power to the vibrator 130 (vibration generation step: S200).

At this time, the vibration generated from the vibrator 130 is transmitted to the support 126, the support 122, the height adjusting unit 124 in order to reach the charging container (110).

On the contrary, part of the vibration transmitted from the vibrator 130 to the work table 170 is offset by the dustproof port 140 so that the vibration of the container support 154 can be blocked.

Thereafter, the metal powder inside the charging container 110 is opened by the action of the opening and closing hole 160 to drop downward through the hole 114 (opening step: S300).

If a predetermined time elapses after the container opening step S300 is performed, the measuring step S400 is performed.

Hereinafter, a detailed configuration of the measuring step S400 will be described with reference to FIG. 3.

Figure 3 is a flow chart showing in detail the measurement step, one step in the flow and apparent density measurement method according to the present invention.

As shown in the drawing, the measuring step (S400) is to measure the flow time of the metal powder by measuring the time taken to the point where all of the metal powder inside the charging container 110 falls, the apparent density measuring container 152 The apparent density is measured by measuring the mass of the metal powder collected in a predetermined volume therein.

Looking in more detail, the measuring step (S400), largely measuring the flow time (S410) for measuring the time all the metal powder inside the charging container 110 and discharged from the charging container (110) An apparent density measurement process (S450) of collecting the metal powder in the apparent density measuring container 152 and measuring the mass per unit volume is performed.

In addition, a plurality of processes are continued in the flow measurement process S410 and the apparent density measurement process S450, respectively.

That is, after the flow measurement step (S410), the flow rate of the metal powder measured without the operation of the vibrator 130 and the flow rate of the metal powder measured by operating the vibrator 130 compared with each other Flow calculation process for calculating the correction coefficient (α) (S420) and the flow rate for calculating the flow rate using the flow rate and the flow correction coefficient (α) of the metal powder measured by operating the vibrator 130 Degree conversion process (S430) is carried out.

The flow correction factor calculation process S420 calculates the flow correction factor α according to Equation 1) below.

Equation 1) Flow Correction Coefficient (α) = Reference powder flow rate when the vibrator is not operating / Reference powder flow rate when the vibrator is operated

The flow rate conversion process (S430) is to convert the flow rate according to Equation 2) below.

Equation 2) Conversion fluidity of the test powder when the vibrator is operated = Flow correction factor × Measured flow rate of the test powder when the vibrator is operated

In addition, after the apparent density measurement process (S450), the apparent density of the metal powder measured without the operation of the vibrator 130 and the apparent density of the metal powder measured by operating the vibrator 130 are compared with each other. Calculate the apparent density using the density correction coefficient calculation process (S460) for calculating the density correction coefficient (β) and the apparent density and the apparent density correction coefficient (β) of the metal powder measured by operating the vibrator 130. The apparent density conversion process (S470) is carried out.

The density correction coefficient calculation process S460 calculates the density correction coefficient β according to Equation 3) below.

Equation 3) Apparent Density Correction Coefficient (β) = Reference Powder Apparent Density when Vibrator is inoperative / Reference Powder Apparent Density when Vibrator is in operation

In the apparent density conversion process (S470), the apparent density is converted according to Equation 4) below.

Equation 4) Conversion of test powder when operating the vibrator = apparent density correction factor × measurement of the test powder when operating the vibrator

The detailed process of the measuring step (S400) will be described through the following examples.

In the embodiment of the present invention, the hole 114 is set to 2.5 mm, the vibrator 130 is adopted to have a vibration force of 5 ~ 50kg, frequency 50 ~ 60Hz, frequency 3000 ~ 3600VPM.

In addition, the separation distance D was set to 25 mm, and the vibration generated in the vibrator 130 was not transmitted to the apparent density measuring container 152.

[Example]

Titanium (Ti) powder prepared by the HDH method was adopted as an example of the metal powder to measure the fluidity. Titanium (Ti) powder used in the experiment was prepared with four metal powders having particle sizes of 60 mesh, 100 mesh, 200 mesh, and 400 mesh, respectively.

Titanium (Ti) powder of 100 mesh size could be measured by a conventional hall flow meter, but 200 mesh and 400 mesh powders could not be measured.

The measured 100 mesh titanium (Ti) powder had a flow rate of 8.2 sec / 50 g and an apparent density of 1.54 g / cm 3.

On the other hand, 100mesh titanium (Ti) powder was measured using the measuring device 100 according to the present invention as a result of measuring the flow rate was 9.8sec / 50g and the apparent density is 1.57g / ㎠ The degree of agreement with the flow rate measured by conventional equipment was over 98%.

In addition, the flow rates of the 200/400 mesh were 58.8 sec / g and 165.6 sec / 50g, respectively. In this case, the fluidity correction coefficient (α) can be obtained using standard powder or the same powder which can measure the fluidity. The flow correction coefficient (α) of the Ti powder used in the above experiment was 0.83, and the flow rates of the actual 200mesh and 400mesh can be evaluated as 48.8sec / g and 137.4sec / 50g, respectively.

The data of the above embodiment is summarized in FIG. 4.

Figure 4 is a table comparing the measured values of the Examples and Comparative Examples measured using the fluidity and apparent density measuring device of the metal powder according to the present invention.

As shown in the figure, in the case of the present invention in which the vibrator 130 is installed, it can be seen that both 200mesh and 400mesh can be measured.

Then, the flow rate of 8.2sec / 50g of the 100mesh titanium powder which can be measured using the conventional apparatus without the vibrator 130 divided by the flow rate of 9.8sec / 50g measured using the measuring device 100 of the present invention. The fluidity correction coefficient α defined by the value is 0.83.

Therefore, when the flow correction coefficient (α) is multiplied by the flow rate 58.8 sec / 50g 165.6 sec / 50g measured by the measuring device 100 of the present invention for 200 mesh, 400 mesh (flow rate conversion process (S430)) We can predict the actual flow rates of 48.8sec / 50g and 137.4sec / 50g respectively.

On the other hand, the apparent density measured without operating the vibrator 130 was measured to 1.55g / cm 3 in the case of 100mesh, 200mesh, 400mesh was not measured.

However, the apparent density measured in the state where the vibrator 130 was operated using the measuring apparatus 100 of the present invention is 1.57g / cm 3 for 100mesh, 1.41g / cm 3 for 200mesh, and 1.37g / cm 3 for 400mesh. Were measured respectively.

Therefore, the apparent density for the titanium powder of 200mesh and 400mesh was calculated by calculating the apparent density correction coefficient (β) by dividing 1.55 by 1.57 using the measured fluidity of 100mesh regardless of the operation of the vibrator 130. When multiplied by the measured value, the apparent density of 1.38 g / cm 3 for 200 mesh and 1.34 g / cm 3 for 400 mesh was obtained.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

For example, in the embodiment of the present invention was carried out by taking titanium (Ti) powder as an example, of course, it can be applied to a variety of metal powder having a particle size range of 1nm to 1mm.

As described in detail above, in the fluidity and apparent density measuring apparatus of the metal powder according to the present invention, it is possible to measure the fluidity of the metal powder having low fluidity by using vibration.

Therefore, there is an advantage in that the application range of the metal powder which can measure the fluidity and the apparent measurement is expanded.

In addition, the present invention was configured to calculate the correction coefficient through the comparison test with the reference powder (powder measurable in the conventional measuring device and powder that can be measured without the operation of the vibrator) to convert the flow and apparent density of the actual metal powder .

Therefore, there is an advantage that the flow rate and apparent density can be measured more accurately.

Claims (11)

A charging container into which a metal powder having a particle size of 1 nm to 1 mm is loaded; Support for maintaining the charging container at a certain height, A vibrator for providing vibration to the support; A dustproof opening for blocking the vibration generated from the vibrator from being transmitted to the ground; Apparatus for measuring the fluidity and apparent density of the metal powder, characterized in that it comprises an apparent density measuring sphere for collecting the metal powder falling from the charging container. The apparatus of claim 1, wherein the vibration provided to the support is transmitted to a charging container. According to claim 1, At one side of the charging container, Apparatus for measuring the fluidity and apparent density of the metal powder, characterized in that the opening and closing opening for selectively opening the lower portion of the charging space inside the charging container. The method of claim 1, wherein the apparent density measuring sphere, Apparatus for measuring the fluidity and apparent density of the metal powder, characterized in that spaced apart from the vibrator. The method of claim 4, wherein the apparent density measuring sphere, Apparent density measuring vessel, And the container support for supporting the load of the apparent density measuring vessel and metal powder, Located at the lower side of the measuring vessel and the flow rate and apparent density measuring device of the metal powder, characterized in that it comprises a collecting unit for collecting the metal powder dropped on the outside of the measuring vessel. The apparatus of claim 1, wherein the vibrator has an excitation force of 5 to 50 kg, a frequency of 50 to 60 Hz, and a frequency of 3000 to 3600 VPM. A device setting step of charging a metal powder into a charging container and disposing an apparent density measuring container below the charging container; A vibration generating step of operating a vibrator to transmit vibration to the charging container; A container opening step of opening one side of the charging container so that the metal powder falls; A flow rate and apparent density measurement method using the flow rate and the apparent density measuring device of the metal powder, characterized in that the measuring step of measuring the flow rate and the apparent density of the metal powder. The method of claim 7, wherein the measuring step, A flow rate measuring process for measuring a time for discharging all of the metal powder in the charging container; Flow rate and apparent density using the flow rate and apparent density measuring device of the metal powder, characterized in that it comprises an apparent density measurement process for measuring the mass per unit volume by collecting the metal powder discharged from the charging container in the apparent density measurement container How to measure According to claim 8, After the flow measurement process, A flow correction factor calculation process of calculating a flow correction factor by comparing the flow rate of the metal powder measured without the operation of the vibrator with the flow rate of the metal powder measured by operating the vibrator; Flow rate and apparent density using a device for measuring the flow rate and apparent density of the metal powder, characterized in that the flow rate conversion process for calculating the flow rate using the flow rate and the fluidity correction coefficient of the metal powder measured by operating the vibrator Density Measurement Method According to claim 7, After the apparent density measurement process, A density correction coefficient calculation process of calculating an apparent density correction coefficient by comparing the apparent density of the metal powder measured without the operation of the vibrator with the apparent density of the metal powder measured by operating the vibrator; Flow rate and fluidity using the apparatus for measuring the flow rate and apparent density of the metal powder, characterized in that the apparent density conversion process for calculating the apparent density using the apparent density and the apparent density correction coefficient of the metal powder measured by operating the vibrator Apparent density measurement method. According to claim 7, wherein in the equipment setting step, The lower end of the charging vessel and the upper end of the apparent density measuring vessel is a flow rate and apparent density measuring method using a flow rate and apparent density measuring device of the metal powder, characterized in that spaced 25mm apart.

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