JP2007050474A - Cutting lubricating liquid supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting lubricating liquid supply device being comparatively compact and capable of supplying cutting lubricating liquid by sufficient high pressure without biting impurities. <P>SOLUTION: This cutting lubricating liquid supply device is composed of a motor 13 provided on a base, a non-contact type pump 2 driven by the motor, a filter 9 connected with a discharge line L4 of the non-contact type pump and provided on the base B0, a contact type pump 5 connected with a discharge line 19 of the filter and driven by the motor, and a supply line L17 for cutting lubricating liquid connected with a discharge side of the contact type pump. An output shaft 3 of the motor is extended in a lower part of the base to connect the contact type pump with the non-contact type pump, and an oil reservoir 16 for storing cutting lubricating liquid is provided on a suction side of the non-contact type pump 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting lubricant supply apparatus for cooling a cutting portion of a cutting tool of a machine tool.

As is well known, the cutting portion of a machine tool is supplied with a lubricating fluid for cutting such as a water-soluble coolant or cutting oil in order to smoothly perform the cutting operation, thereby suppressing the heat generated by the cutting tool or workpiece (workpiece). Is going smoothly.
Japanese Utility Model Laid-Open No. 63-176510 is known as such an apparatus (for example, see Patent Document 1).
Since such a cutting lubricant contains a relatively large amount of impurities such as iron powder, impurities are removed by a filter device.
However, as in the known art, when a gear pump is used, impurities such as iron powder bite into the gear teeth and the inner wall of the casing to wear out the gear and casing, leading to performance degradation and failure.

Therefore, if a non-contact type centrifugal pump is used as a cutting lubricant supply device, for example, the above-described problems of biting and wear are relatively reduced, but the filter is passed or the cutting lubricant is supplied to the end of the supply line. There is a drawback in that the pump device is enlarged due to insufficient pressure for injecting from the nozzle.
Japanese Utility Model Publication No. 63-176510

  Accordingly, it is an object of the present invention to provide a cutting lubricant supply device that is relatively small and does not bite impurities such as chips and can supply the cutting lubricant at a sufficiently high pressure.

  As a result of various studies, the applicant has provided a filter for filtering impurities such as chips in the cutting lubricant on the suction port side of the contact-type positive displacement pump that discharges at a high pressure, and the filter contains the cutting lubricant. The non-contact type pump for pumping the pressure is arranged coaxially with the contact type positive displacement pump, thereby reducing the size of the entire device, preventing impurities from flowing into the contact positive displacement pump, and pumping due to wear and damage. Invented a lubricating fluid supply device for cutting that can prevent the performance deterioration and failure of the product and improve the durability. The present invention has been created by such research.

  According to the present invention, in a cutting lubricant supply device for cooling a cutting portion of a cutting tool of a machine tool, a motor 13 provided on a base B0, and a non-contact pump 2 driven by the motor 13 are provided. A filter 9 connected to the discharge line L4 of the non-contact pump 2 and installed on the base B0; a contact pump 5 connected to the discharge line L15 of the filter 9 and driven by the motor 13; The cutting fluid supply line L17 is connected to the discharge side of the contact pump 5, and the output shaft 3 of the motor 13 extends below the base B0 to contact the contact pump 5 and the non-contact. An oil storage unit 16 for storing cutting lubricating fluid is provided on the suction side of the non-contact pump 2.

Here, the cutting lubricating liquid refers to a liquid that cools or lubricates a cutting tool, a grinding tool, or an object to be cut (workpiece) during cutting or grinding so as to perform smooth processing.
In the practice of the present invention, the non-contact pump is preferably a non-contact centrifugal pump, and the contact pump is preferably a contact positive displacement gear pump. Further, the discharge pressure can be increased by making the rotor of the contact-type pump into a plurality of stages.

It is preferable that first and second filters that can be switched with each other are provided as the filter.
In implementation, for example, when the function of the first filter in operation is reduced due to clogging, the operation is switched to the second filter so that the operation is not stopped for replacement or maintenance of the filter.

It is preferable that a suction pressure detection device is provided on the suction side of the contact pump.
In implementation, the suction pressure detecting device detects a change in suction pressure due to filter clogging and switches the filter.

The effects of the lubricating fluid supply device for cutting according to the present invention described above will be listed.
(1) Since a non-contact pump that leads to the oil pan is provided on the suction side of the contact pump, and a filter is provided on the discharge side of the non-contact pump, impurities such as chips in the cutting lubricant are filtered. There is an advantage that a clean cutting lubricating liquid can be supplied to the contact pump, and damage or deterioration of the function of the contact pump due to the biting of impurities can be prevented.
(2) Since the contact type pump and the non-contact type pump are coaxially connected to the output shaft provided below the motor, there is an advantage that the entire apparatus can be reduced in size.
(3) If the first and second filters that can be switched to each other are provided as the filter, for example, when the functioning first filter is clogged and the function is deteriorated, the filter is switched to the second filter. There is an advantage that operation can be prevented from being stopped for maintenance.
(4) If a suction pressure detection device is provided on the suction side of the contact pump, there is an advantage that a change in suction pressure due to clogging of the filter is detected by the suction pressure detection device and the filter can be switched at an appropriate timing.
(5) If the contact pump is multistage, there is an advantage that the discharge pressure can be increased.

Hereinafter, an embodiment of a cutting lubricant supply apparatus of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a cutting lubricant supply apparatus according to the present invention, and FIG. 2 is an actual configuration diagram.

In the block diagram shown in FIG. 1, an output shaft drive shaft 3 provided with a coupling 12 is connected to an electric motor M as a power source, and a second pump 5 is connected to the drive shaft 3. The first pump 2 is coaxially connected to the drive shaft 3 penetrating through the shaft. The coupling 12 may be omitted.
The first pump 2 is a non-contact type centrifugal pump, and the suction side is connected to an oil strainer 1 disposed in an oil reservoir 16 for storing a cutting lubricant by a suction line (pipe) L3. .

  The discharge side of the first pump 2 is connected to the suction port 10i of the three-way valve 10 by a discharge line L4. An overflow line L7 that returns to the suction line L3 is connected to the branch portion 21 provided in the discharge line L4. A relief valve 7 is provided and connected.

  The discharge side of the three-way valve 10 is the first filter 9a of the filter 9 configured as a pair by the first filter line L13 or the second filter line L14 selected by the plate valve 10a fixed to the operating rod 10b. Alternatively, it is configured to be connected to the suction side of the second filter 9b.

  The discharge side of the first filter 9a is connected to a discharge line L13a provided with an on-off valve 19a, and the discharge side of the second filter 9b is connected to a discharge line L14a provided with an on-off valve 19b. The discharge lines L <b> 14 a merge at the junction 23.

The second pump 5 driven coaxially by the first pump 2 and the drive shaft 3 of the motor 13 is a contact-type positive displacement gear pump of a contact-type pump, and the suction side is connected to the junction 23 and the second pump. 5 are connected by a suction line L15.
A pressure gauge 8 of a suction pressure detecting device for detecting the suction pressure of the second pump 5 is attached to the suction line L15.
The discharge side of the second pump 5 is connected to a cutting lubricant supply port 28 located near the cutting portion of the cutting machine by a discharge line L17.
Although not shown, the rotor of the second pump 5 may be a single stage or multiple stages depending on the required pressure of the cutting lubricant supply port 28.

  An overflow line L11 returning to the suction line L15 is connected to a branching section 25 provided in the discharge line L17 of the second pump 5 by providing a second relief valve 11.

  A dotted line L18 connected to the cutting lubricant supply port 28 is a return line for returning the cutting lubricant after cooling or lubricating the cutting portion of the cutting machine into the oil reservoir 16.

  FIG. 2 is a block diagram of the block diagram 1 described above. Parts not explicitly shown in FIG. 2 will be described with reference to FIG.

In FIG. 2, an electric motor M as a power source is disposed on an upper base B2b attached to the upper part of a plurality of legs B2a upright on a second base B2 installed on an upper part of a base B0 parallel to the floor surface. The shaft 3 of the output shaft is provided vertically downward.
A coupling 12 is interposed on the shaft 3, and the first rotor 5 a and the second rotor 5 b of the contact-type positive displacement gear pump 5, which is a second pump, are two stages below the coupling 12. Attached. The coupling 12 may not be provided.

  Further, the first pump 2 is coaxially attached to the shaft 3 below the gear pump 5. The first pump 2 is a non-contact centrifugal pump, and an impeller 2 a is mounted in a casing 2 b of the pump 2.

  A suction port of the first pump 2 is provided at the center bottom of the casing 2b, and a strainer 1 for filtering impurities such as chips contained in the cutting lubricant is provided below the suction port. The strainer 1 is disposed inside the oil storage portion 16 that stores the lubricating fluid for cutting, and has a function of filtering a relatively large impurity indicated by the symbol C.

The second pump (gear pump) 5 and the first pump (spiral pump) 2 are built in a casing 4 attached below the base B 0, and an oil reservoir 16 is attached to the lower part of the casing 4.
One of the discharge lines L4 leading to the discharge port of the first pump 2 is attached to the casing 4, and the other of the discharge lines L4 is connected to the three-way valve 10.

  Although not clearly shown in FIG. 2, an overflow line L7 returning to the suction line L3 is attached to the branch portion 21 provided in the discharge line L4 on the first base B1 disposed on the upper part of the base B0. A first relief valve 7 is provided and connected.

The three-way valve 10 is attached to the first base B1 above the base B0. The first filter line L13 or the second filter line 10 is selected by a valve plate 10a that selects two lines on the discharge side that are not clearly shown in FIG. The filter line L14 is connected to the suction side of the first filter 9a or the second filter 9b.
The valve plate 10a is fixed to a manual operation rod 10b, and always uses one of the first filter 9a or the second filter 9b, waits for the other, and stops operation by maintenance such as filter replacement or cleaning. It is configured not to be.

  The discharge side of the first filter 9a is connected to a discharge line L13a provided with an opening / closing valve 19a which is not clearly shown in FIG. 2, and the discharge side of the second filter 9b is connected to a discharge line L14a provided with an opening / closing valve 19b. In other words, the discharge line L13a and the discharge line L14a merge at the junction 23.

The second pump 5 driven coaxially with the first pump 2 by the shaft 3 of the output shaft is a contact type positive displacement gear pump, and a suction port provided in the casing 4 is connected to the merging portion 23 by the second. The pump 5 is connected by a suction line L15.
A pressure gauge 8 of a suction pressure detecting device for detecting the suction pressure of the second pump 5 is attached to the suction line L15.

The discharge side of the second pump 5 is connected to a cutting lubricant supply port 28 located near the cutting portion of the cutting machine by a discharge line L17.
The cutting lubricant supply port 28 is not necessarily a nozzle, and may be any shape as long as the cutting lubricant that has been filtered and cleaned is poured into the cutting portion.

  A second relief valve 11 in which an overflow line L11 returning to the suction line L15 is attached to the third base B3 is provided at a branch portion 25 not shown in the drawing provided in the discharge line L17 of the second pump 5. It is connected.

  Although not clearly shown in FIG. 2, the cutting lubricant sprayed from the cutting lubricant supply port 28 is configured to return to the oil reservoir 16.

The operation of the cutting lubricant supply apparatus having the above configuration will be described with reference to FIGS.
First, the operation of the electric motor 13 activates the first pump 2 and the second pump 5.
Due to the operation of the non-contact spiral pump of the first pump 2, the cutting lubricant in the oil reservoir 16 passes through the strainer 1 and relatively large impurities C such as chips are first filtered. Then, the air is sucked into the first pump 2, pressurized, and pumped toward the three-way valve 10 via the discharge line L4.
The discharge line L4 has an overflow line L7 provided with a first relief valve 7 for adjusting the discharge amount, and a predetermined appropriate amount reaches the three-way valve 10.

Next, the first filtered filtered lubricant that has reached the three-way valve 10 is manually flown into the first filter 9a or the second filter 9b by the three-way valve 10. 10b is selected. At the position of the manual rod 10b in the block diagram 1, the valve plate 10a selects the first filter 9a.
At this time, the on-off valve 19b provided in the discharge line L14a of the second filter 9b is closed.

Then, the cutting lubricating fluid that has flowed into the first filter 9 a is subjected to secondary filtration for removing relatively small impurities C 1, and then flows into the suction line L 15 of the second pump 5 through the junction 23.
Here, the suction pressure gauge 8 of the suction pressure detecting device for detecting the suction pressure of the second pump 5 attached to the suction line L15 detects the suction pressure, that is, the flow path resistance in the first filter 9a.

  If the flow path resistance detected by the suction pressure gauge 8 is equal to or greater than a predetermined value, the filtering function of the first filter 9a is the limit, and the outlet of the three-way valve 10 is changed to the opposite side, and the second filter 9b. Is used. Then, the first filter 9a is replaced with a new one or maintained by cleaning or the like, and preparations for re-use are made.

The clean cutting lubricating liquid from which the second impurity is filtered by the first filter 9a (or the first filter 9b) to remove the small impurity C1 is sucked into the second pump 5 through the suction line L15. The pressure is increased by the first rotor 5a and the second rotor 5b, and is supplied from the discharge side of the second pump 5 to the cutting lubricant supply port 28 via the discharge line L17.
The discharge line L17 has an overflow line L11 provided with a second relief valve 11 for adjusting the discharge amount, and a predetermined appropriate amount reaches the cutting lubricant supply port.

Then, a cutting lubricating liquid is supplied to the cutting part of the cutting machine to cool and lubricate the cutting part, and chips and the like are removed from the cutting part to perform smooth cutting. In addition, in the case of a grinding machine, the abrasive powder and the like are washed away together with the grinding powder to perform smooth cutting.
The lubricating fluid for cutting that has acted in this way is returned to the oil reservoir 16 and is naturally cooled and used in a circulating manner.

It is a block diagram which shows embodiment of the lubricating fluid supply apparatus for cutting of this invention. FIG. 2 is an actual configuration diagram of FIG. 1.

Explanation of symbols

B0: Base B1, B2, B3: First, second, third base L3, L4, L7, L11, L13, L13a: Line (pipe)
L14, L14a, L15, L17, L18 ... line (pipe)
1 ... Strainer 2 ... 1st pump (spiral pump)
3 ... Shaft (output shaft)
4 ... casing 5 ... second pump (gear pump)
5a, 5b ... 1st, 2nd rotor 7 ... 1st relief valve 8 ... Pressure gauge (suction pressure detection device)
9a, 9b ... 1st, 2nd filter 11 ... 2nd relief valve 10 ... 3 way valve 12 ... Coupling 13 ... Electric motor 16 ... Oil storage part 19a, 19b ... Open / close valve 28 ... Lubricating fluid supply port for cutting

Claims (3)

In a cutting lubricant supply device for cooling a cutting portion of a cutting tool of a machine tool, a motor provided on a base, a non-contact pump driven by the motor, and a discharge line of the non-contact pump A filter connected and installed on the base, a contact type pump connected to the discharge line of the filter and driven by the motor, and a supply line of cutting lubricant connected to the discharge side of the contact type pump The output shaft of the motor extends to the lower part of the base, and the contact pump and the non-contact pump are connected to each other, and the cutting lubricant is stored on the suction side of the non-contact pump. A lubricating oil supply device for cutting, characterized in that an oil reservoir is provided. The cutting lubricant supply device according to claim 1, wherein first and second filters that can be switched to each other are provided as the filter. 3. The cutting lubricant supply device according to claim 1, wherein a suction pressure detection device is provided on the suction side of the contact pump.

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