KR20200002054A - Abrasive Flow Machine Comprising Pumps for Applying pressure in the Opposite Direction - Google Patents

Abstract

The present invention relates to an abrasive flow machine for performing polishing using a flowing abrasive, the abrasive flow machine including: a holder for positioning an abrasive object and having an inlet and an outlet for an abrasive; a first pump pressurizing the abrasive positioned at the upper end of the holder in a holder direction; and a second pump pressurizing the abrasive positioned at the lower end of the holder in the holder direction. The pressing forces of the first pump and the second pump are set differently from each other, so that even in the case of a long polishing object, uniform polishing can be performed.

Description

Abrasive Flow Machine Comprising Pumps for Applying pressure in the Opposite Direction}

The present invention relates to a abrasive abrasive grinder comprising a first pump and a second pump pressurizing the abrasive in both directions about an abrasive object.

In general, the polishing and polishing work of the mold is a finishing process corresponding to the last step in the mold fabrication process, which is important enough to influence the processing result of the mold.

As a kind used in the polishing operation, a flow that polishes or polishes a workpiece by passing a viscous inclusion having abrasive particles therein by applying pressure through an orifice extending over or through the workpiece. There is an abrasive grinding process.

Traditional abrasive abrasive grinding processes are subject to variations in inclusion temperature, flow rate and viscosity, and are designed to control and maintain a constant inclusion discharge pressure by these conditions. Viscosity in turn affects the abrasive flow machine (AFM) machining time, which in turn affects the system's ability to accurately predict the overall machining result.

For example, the inclusion temperature rises as the flow rate of the inclusion through the orifice increases. If the orifice is subject to inclusions under constant pressure, the flow rate of the inclusions passing through the orifice increases as the orifice wall becomes smoother and the diameter of the orifice increases. As a result, not only the temperature of the inclusions increases, but such increase increases the flow rate and concentrates the inclusions passing through the orifice. This not only makes the temperature too high but also makes the temperature distribution uneven throughout the inclusions. High temperatures and temperature variations throughout the inclusions prevent the inclusions from working in a consistent and effective manner. Therefore, an apparatus or method which can effectively use inclusions and at the same time maintain the temperature of the inclusions in a relatively narrow temperature range is desirable.

In relation to such polishing, Patent Document 1 is the first to be located upstream of the holder and to be connected with the upstream side of the holder to forcibly push the media to the downstream side of the holder supporting the material under a predetermined pressure. Volumetric pumps; An inclusion blocker positioned downstream of the holder and connected to a downstream side of the holder to prevent flow of the inclusions downstream of the holder; A abrasive abrasive abrasive comprising an inclusion flow rate measuring device for determining a flow rate of an inclusion passing through the holder.

The patent document 1 can control the flow rate of the inclusions using the inclusion blocker, but the pressure is applied only in one direction of the upstream side or the downstream side with respect to the inclusions.

Patent document 2 is a processing machine for performing a gloss or polishing by flowing up and down the compound particles of diamond or cemented carbide material with respect to the inner circumference of the mold, the up-down cylinder to the abrasive tube with the upper and lower ends supported and fixed respectively The received abrasive particles are for a particle flow processing machine configured to cause the upper and lower flow cylinders to be polished through the inner circumference of the mold.

The patent document 2 discloses a particle flow processing machine including an upper flow cylinder and a lower flow cylinder, but there is a limit in that the injection of the abrasive is not made continuously.

Therefore, there is a need for a technology that can improve the micro burr or surface roughness that occurs after the processing of parts used in precision devices, while saving the time and cost required for the machining process by an automated method. High situation.

Korean Registered Patent Publication No. 0571126 (2006.04.07) Korean Registered Patent Publication No. 1318650 (October 10, 2013)

The present invention is to solve the above problems, by deburring (polishing) and polishing (polishing) process for precision parts by achieving the removal process of the fine burr and the improvement of the surface roughness existing after the part processing by an automated method Can be performed quickly and economically.

The abrasive grain abrasive according to the present invention for achieving the above object is a fluid abrasive polisher for performing the polishing using a flowing abrasive, the polishing object is positioned, the holder formed with the inlet and outlet of the abrasive, the holder of the A first pump for pressing the abrasive located in the upper end in the holder direction, and a second pump for pressing the abrasive located in the lower end of the holder in the holder direction, the pressing force of the first pump and the second pump is different from each other Can be set.

The pressing force of the first pump may be set larger in a range of 150% to 800% based on the pressing force of the second pump.

The first pump includes a first cylinder and a first piston, the first piston pressurizes the abrasive from the first cylinder in the direction from the top side to the bottom side of the holder, and the second pump includes the second cylinder And a second piston, wherein the second piston may be configured to pressurize the abrasive from the second cylinder toward the top side from the bottom side of the holder.

The inlet of the abrasive is formed in the first pump, the outlet of the abrasive is formed in the second pump, the abrasive discharged from the second pump may be injected into the inlet of the first pump.

In addition, the first pump may include a first inlet through which the abrasive flowing from the abrasive supply part is injected, and a second inlet through which the abrasive discharged from the second pump is introduced, wherein the abrasive injected into the first inlet is After polishing the abrasive object is discharged to the outlet of the second pump, the abrasive discharged from the second pump is injected into the second inlet of the first pump, the abrasive injected into the first inlet and the second inlet After moving in the direction of the second pump may pass through the outlet of the second pump to return to the first pump continuously.

On the other hand, the abrasive may be a silicon carbide material when the HRD hardness of the polishing object is 70 or less, and a diamond material may be used when it is 70 or more.

As described above, the abrasive abrasive abrasive according to the present invention is a pressure injection of the abrasive in a direction facing each other with respect to the polishing object, and applies a different size to press in the opposite direction, bar pressure in both directions for the polishing object At the same time the abrasive can be moved to one side of the holder. Therefore, even when the length of the polishing object is long, a homogeneous polishing and deburring effect can be obtained at the lower side and the upper side.

In addition, the injection of the abrasive can be set to be made continuously, a rapid polishing can be made by the progress of the continuous process.

1 is a front view of the abrasive abrasive grinding machine according to the present invention.
FIG. 2 is a perspective view of a piston constituting the second pump of FIG. 1. FIG.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention relates to a abrasive abrasive grinding machine that performs polishing by using a flowing abrasive, wherein the polishing object is positioned, a holder in which an inlet and an outlet of the abrasive are formed, and a first abrasive pressurizing the abrasive located at an upper end of the holder in a holder direction. A pump and a second pump for pressing the abrasive positioned in the lower end of the holder in the holder direction, wherein the pressing force of the first pump and the second pump may be set differently from each other.

Parts used in various mechanical devices, including precision devices, require dimensional safety for fastening and joining, and therefore, it is necessary to prevent the occurrence of minute size burrs.

Also, in some cases, fine burs can be removed and mirror-polished by applying pressure to the elastic abrasive to reciprocate the elastic abrasive to improve the surface roughness.

The present invention is for deburring and polishing the surface of a component of a metal material such as copper, aluminum and titanium, wherein the first and second pumps are subjected to pressure after placing the component to be polished in the holder. It consists of a structure which makes an abrasive flow while applying.

As the abrasive flows while the abrasive object is placed in the holder, the abrasive may flow in a sealed structure except for an inlet and an outlet of the abrasive so that the flowing abrasive does not flow out.

A first pump is positioned at an upper end of the holder and a second pump is positioned at a lower end of the holder, and pressing forces of the first pump and the second pump are set differently from each other. Will flow.

For example, the pressing force of the first pump may be set larger in the range of 150% to 800% based on the pressing force of the second pump, such that the flow of abrasive is directed from the first pump to the second pump. That is, it may be formed in the lower direction from the top of the holder.

The flow rate, temperature, and degree of polishing of the abrasive may vary according to the pressure difference between the first pump and the second pump, and the pressing force of the pumps may be set in consideration of the rigidity of the material to be polished and the degree of polishing.

That is, the portion where the holder and the first pump are connected is the inlet of the abrasive, and the portion where the holder and the second pump are connected is the discharge portion of the abrasive.

The first pump is composed of a first cylinder and a first piston, the first piston pressurizes the abrasive from the first cylinder to the lower side from the upper side of the holder, the second pump is a second cylinder And a second piston, wherein the second piston can pressurize the abrasive from the second cylinder to the upper end side from the lower end side of the holder.

That is, the abrasive forms a flow in the direction of the pump with low pressure, but the abrasive object can be uniformly polished on the top and bottom sides because the abrasive is pressurized in both the top and bottom directions.

The abrasive abrasive grinder has a structure in which the flow of the abrasive is continuously circulated. Compared to the case where the abrasive is conventionally used only once and discharged out of the apparatus, it is possible to omit the refilling process of the abrasive and thus the time required for the polishing process. There is an advantage of shortening.

In order to form a continuous circulation of the abrasive as described above, the inlet of the abrasive is formed in the first pump, the outlet of the abrasive is formed in the second pump, the abrasive discharged from the second pump is the first Can be injected into the inlet of the pump.

The first pump includes a first inlet through which the abrasive flowing from the abrasive supply part is injected and a second inlet through which the abrasive discharged from the second pump is introduced.

The abrasive injected into the first inlet is discharged to the outlet of the second pump after polishing the polishing object, the abrasive discharged from the second pump is injected into the second inlet of the first pump, and the first The abrasive injected into the inlet and the second inlet continuously carries out a circulation returning to the first pump through the outlet of the second pump after moving in the direction of the second pump.

In this regard, FIG. 1 schematically shows a front view of the abrasive abrasive abrasive of the present invention, and FIG. 2 schematically shows a perspective view of a piston constituting the second pump of FIG.

Referring to FIGS. 1 and 2, the abrasive abrasive machine is located at the bottom of the holder 110, the first pump 120 located at the top of the holder 110, the holder 110, on which the polishing object A is located. It includes a second pump 130.

An abrasive inlet 111 of the abrasive is positioned between the first pump 120 and the holder 110, and an outlet 112 of the abrasive is positioned between the second pump 130 and the holder 110.

The inlet 111 and the outlet 112 of the abrasive may be formed in the same form, for example, may be a plate-shaped structure formed with a through hole, may be a network structure, or a structure formed with a plurality of orifices It may be made of.

The first pump 120 includes a first cylinder 121 and a first piston 122, and the first inlet 123 and the second inlet 124 are positioned inside the first cylinder pressurized by the first piston. do.

The abrasive stored in the abrasive supplier 140 is introduced into the first pump 120 through the first inlet 123.

The second pump 130 includes a second cylinder 131 and a second piston 132, and the abrasive discharged from the holder 110 is accumulated on the second piston 132 of the second pump, some of which are described below. As described in the description, the second piston 132 passes through the outlet 133 of the second pump 130. The second pump 130 also applies pressure in the direction of the holder 110, and a force for pushing the abrasive accumulated on the second piston 132 in the direction of the holder 110 is applied. However, since the pressure of the first pump 120 is greater than the pressure of the second pump 130, the abrasive flows toward the second pump 130 as a whole.

As shown in FIG. 2, the second piston 132 of the second pump 130 may have a planar circular structure having a plurality of through holes 132 ′, and preferably, the planar circular structure. Is not particularly limited and may be modified in a shape corresponding to the planar shape of the second cylinder 131. In addition, the size, shape and number of the through holes 132 'can be appropriately changed as necessary.

The abrasive accumulated on the upper surface of the second piston 132 is pushed out toward the lower surface of the second piston 132 by the pressing force of the first pump 120, and the through hole 132 'is a flow path of the abrasive. Can be used.

As described above, since the second piston 132 is in direct contact with the flow of the abrasive, it is preferable that the second piston 132 is made of a material that can be prevented from being polished by the abrasive. Alternatively, in consideration of the possibility of polishing the second piston 132, the second piston 132 in the second pump 130 may be configured as a replaceable structure as a consumable.

Meanwhile, the inlet 111 and the outlet 112 of the abrasive of the holder 110 may be formed in a form similar to the second piston 132 illustrated in FIG. 2, and the inlet 111 and the outlet of the abrasive 110 may be formed. Since the 112 is in direct contact with the flow of the abrasive, it is preferable that the material 112 be made of a material which can prevent the polishing with the abrasive. Alternatively, in consideration of the possibility of polishing the inlet 111 and the outlet 112 of the abrasive, the inlet 111 and the outlet 112 of the abrasive may be made of a replaceable structure as a consumable.

1, the flow direction of the abrasive is indicated by the arrow of FIG. 1, and is discharged from the abrasive and the second pump 130 supplied through the first inlet 123 from the abrasive supply unit 140 and through the second inlet 124. The supplied abrasive flows in the holder direction by the first pump to polish the polishing object and then moves in the direction of the second pump 130, passes through the outlet 133 of the second pump 130, and again the first pump ( The process entering 120 is carried out in a continuous cycle.

On the other hand, the abrasive may be applied by changing the type used according to the hardness of the polishing object, for example, when the HRD hardness of the polishing object is 70 or less, using a silicon carbide material, if 70 or more diamond material Can be used.

Those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

110: Holder
111: abrasive inlet of the holder
112: abrasive discharge portion of the holder
120: first pump
121: the first cylinder
122: first piston
123: first inlet of the first pump
124: second inlet of the first pump
130: second pump
131: second cylinder
132: second piston
132 ': through hole
133: outlet of the second pump
140: abrasive supply unit
A: polishing object

Claims (6)

A abrasive abrasive abrasive for polishing using a flowing abrasive,
A holder for positioning an abrasive object, the inlet and outlet of the abrasive being formed;
A first pump pressurizing the abrasive positioned at an upper end of the holder in a holder direction; And
A second pump pressurizing the abrasive positioned at the lower end of the holder in a holder direction;
Including,
The pressurizing force of the first pump and the second pump is set differently from each other. The abrasive abrasive abrasive of claim 1, wherein the pressing force of the first pump is set larger in a range of 150% to 800% based on the pressing force of the second pump. The method of claim 1, wherein the first pump comprises a first cylinder and a first piston, the first piston pressurizes the abrasive from the first cylinder to the lower side from the upper side of the holder,
And the second pump includes a second cylinder and a second piston, wherein the second piston pressurizes the abrasive from the second cylinder to the upper end side from the lower end side of the holder. According to claim 1, wherein the first pump is formed with the inlet of the abrasive, the second pump is formed with the outlet of the abrasive,
And abrasives discharged from the second pump are injected into the inlet of the first pump. The method of claim 4, wherein the first pump,
A first inlet into which the abrasive flowing from the abrasive supply part is injected, and a second inlet into which the abrasive discharged from the second pump flows,
The abrasive injected into the first inlet is discharged to the outlet of the second pump after polishing the polishing object, and the abrasive discharged from the second pump is injected into the second inlet of the first pump,
Abrasives injected into the first inlet and the second inlet, the flow abrasive grinder, characterized in that the circulation to move to the second pump direction after passing through the outlet of the second pump to return to the first pump continuously . The abrasive abrasive abrasive of claim 1, wherein the abrasive is a silicon carbide material when the HRD hardness of the abrasive object is 70 or less, and a diamond material is used when the abrasive material is 70 or more.

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