JP2016078210A - Positioning jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning jig spreading cleaning fluids in a wide range around a leading end of a positioning pin while securing strength of the positioning pin and being capable of enhancing cleaning effect of a work-piece at the leading end of the positioning pin.SOLUTION: A positioning jig 10 is provided with a positioning pin 1 inserted into a reference hole WH of a work-piece W for specifying a position of the work-piece. A plurality of discharge holes 3 discharging cleaning fluids CS is provided at a leading end 12 of the positioning pin. Discharge directions 4 of the plurality of discharge holes are formed such that the cleaning fluids discharged from the discharge holes collide with one another.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a workpiece positioning jig used in, for example, a machine tool, and more particularly to a positioning jig provided with a mechanism that prevents a foreign substance from entering by discharging a cleaning liquid from a tip portion of a positioning pin.

  For example, as shown in FIG. 10, a workpiece positioning jig 100 used in a machine tool is provided with a reference seat 101 and a positioning pin in order to prevent foreign matter such as chips from adhering to the reference seat 101 and the positioning pin 102. An annular discharge groove 103 that is formed between the positioning pin 102 and opens to the reference surface of the reference seat 101, and a passage that is formed in the positioning pin 102 and that opens at one end to the discharge groove 103. Japanese Patent Application Laid-Open No. H10-228707 discloses a configuration in which 104 and a means 105 for supplying the cleaning liquid 106 to the other end of the passage 104 are provided.

Japanese Utility Model Publication No. 2-104942

  However, in the positioning jig 100 of Patent Document 1, since the ejection groove 103 opens along the periphery of the positioning pin 102 and opens to the reference surface of the reference seat 101, when the positioning pin 102 is inserted into the reference hole of the workpiece W, In many cases, the cleaning liquid 106 discharged from the discharge groove 103 is discharged along the lower surface of the workpiece W and does not reach the tip of the positioning pin 102. Therefore, in the case where the reference hole of the workpiece W is formed so as to penetrate therethrough, the foreign matter that enters from the opening side of the reference hole after the start of processing and adheres between the tip portion of the positioning pin 102 and the reference hole is removed by the cleaning liquid 106. There was a problem that could not be removed. If such foreign matter cannot be removed, the workpiece W is transported to the next process while the foreign matter remains in the reference hole, and when the workpiece W is set in the next step, the foreign matter is removed between the new positioning pin and the workpiece W. Biting occurs, and processing accuracy may be poor.

In order to cope with this problem, the applicant of the present invention, as shown in FIGS. 11 and 12, has a positioning pin provided with a plurality of discharge holes 203 formed in a radially outward direction in a tip portion 202 formed in a tapered shape. It was considered to provide 201.
However, even in this case, if the depth of the reference hole WH of the workpiece W is shorter than the height of the positioning pin 201, the cleaning liquid 204 has a limited range (indicated by dots) based on the hole diameter and the discharge direction of the discharge hole 203. Range) Diffused only in 204S, and there was a problem that it was not possible to prevent the entry of foreign matter from outside the range. On the other hand, it is conceivable to enlarge the diameter of the discharge hole 203 or increase the number of holes of the discharge hole 203, but this is not preferable because the positioning pin 201 is insufficient in strength.

  The present invention has been made to solve the above-described problems, and while ensuring the strength of the positioning pin, the cleaning liquid is diffused over a wide area around the distal end portion of the positioning pin, so that the workpiece around the distal end portion of the positioning pin is obtained. An object of the present invention is to provide a positioning jig capable of enhancing the cleaning effect.

In order to solve the above problems, a positioning jig according to the present invention has the following configuration.
(1) A positioning jig provided with a positioning pin inserted into a reference hole of a workpiece to define the position of the workpiece,
A plurality of discharge holes for discharging cleaning liquid are provided at the tip of the positioning pin, and the discharge direction of the discharge holes is formed so that the cleaning liquid discharged from the discharge holes collides with each other.

In the present invention, the tip of the positioning pin is provided with a plurality of discharge holes for discharging the cleaning liquid, and the discharge direction of the discharge holes is formed so that the cleaning liquid discharged from the discharge holes collides with each other. By colliding each other, the cleaning liquid can be diffused over a wide range. Therefore, the cleaning liquid diffused over a wide range can enhance the cleaning effect of the workpiece around the tip portion of the positioning pin.
Further, since the cleaning liquid discharged from the discharge holes is diffused over a wide range, there is no need to enlarge the diameter of the discharge holes or increase the number of holes. Therefore, the strength of the positioning pin can be maintained at a desired strength.
Therefore, according to the present invention, it is possible to increase the cleaning effect of the workpiece around the tip end portion of the positioning pin by ensuring that the strength of the positioning pin is ensured and diffusing the cleaning liquid around the tip end portion of the positioning pin.

(2) In the positioning jig described in (1),
The discharge direction of each discharge hole is formed toward the upper center of the positioning pin, respectively.

In the present invention, since the discharge direction of each discharge hole is formed toward the upper center of the positioning pin, the cleaning liquid discharged from each discharge hole collides with each other above the vicinity of the center of the positioning pin. be able to. Therefore, the colliding cleaning liquid spreads in an inverted conical shape with respect to the vicinity of the center portion of the positioning pin, and can be diffused without any problem around the positioning pin.
As a result, the cleaning liquid can be diffused in a wide range and uniformly around the front end of the positioning pin, and the work cleaning effect around the front end of the positioning pin can be further enhanced.

(3) In the positioning jig described in (1) or (2),
The discharge hole is characterized in that the diameter of the discharge hole located on the operator side is smaller than the diameter of the other discharge holes.

In the present invention, since the discharge hole is formed so that the hole diameter of the discharge hole located on the worker side is smaller than the hole diameter of the other discharge holes, the cleaning liquid discharged from the discharge hole located on the worker side It is discharged at a higher speed than the cleaning liquid discharged from the discharge holes. Therefore, the cleaning liquid discharged from the discharge hole located on the worker side tends to proceed more in the discharge direction even after colliding with the cleaning liquid discharged from the other discharge holes. Difficult to diffuse.
As a result, it is possible to enhance the effect of cleaning the workpiece around the distal end portion of the positioning pin while appropriately maintaining the working environment on the operator side.

  According to the present invention, a positioning jig capable of enhancing the cleaning effect of a workpiece around the distal end portion of the positioning pin by ensuring that the strength of the positioning pin is ensured and diffusing the cleaning liquid around the distal end portion of the positioning pin. Can be provided.

It is a fragmentary perspective view of the positioning jig which concerns on this embodiment. It is a detailed perspective view of the positioning pin in the positioning jig shown in FIG. It is a top view of the positioning pin shown in FIG. FIG. 3 is a side view of the positioning pin shown in FIG. 2. It is a side view when inserting the reference | standard hole of a workpiece | work in the positioning pin shown in FIG. It is a foreign material removal flowchart figure of the positioning pin shown in FIG. It is a side view of the other Example (1) of the positioning pin shown in FIG. It is a top view of the other Example (2) of the positioning pin shown in FIG. It is a foreign material removal flowchart figure of the positioning pin shown in FIG. It is sectional drawing of the jig | tool for positioning described in patent document 1. FIG. It is a side view of another positioning pin. It is a top view of the positioning pin shown in FIG.

  Next, the positioning jig according to the present embodiment will be described in detail with reference to the drawings. First, the configuration of the positioning pins in the positioning jig will be described, and then a method for preventing the entry of foreign substances by discharging the cleaning liquid from the discharge holes of the positioning pins will be described. Finally, another embodiment of the positioning pin in the positioning jig will be described.

<Configuration of positioning pins in this positioning jig>
First, the configuration of the positioning pins in the positioning jig will be described with reference to FIGS. FIG. 1 is a partial perspective view of a positioning jig according to this embodiment. FIG. 2 shows a detailed perspective view of the positioning pins in the positioning jig shown in FIG. FIG. 3 shows a plan view of the positioning pin shown in FIG. FIG. 4 shows a side view of the positioning pin shown in FIG.

  As shown in FIG. 1, a positioning jig 10 according to this embodiment is a positioning jig for a workpiece (workpiece) W used in a machine tool, and the position of the workpiece W before the workpiece W is processed. There are at least two positioning pins 1 that define the above. The positioning pin 1 is formed at a position facing the reference hole WH so as to be inserted into the reference hole WH of the workpiece W. The reference hole WH of the workpiece W is formed so as to penetrate vertically. The positioning pin 1 is vertically erected with the tip portion 12 facing upward so that the positioning pin 1 is inserted into the reference hole WH from the lower surface side of the workpiece W.

  As shown in FIGS. 2 to 4, the positioning pin 1 includes a side wall portion 11 formed in a columnar shape and a tip end portion 12 formed in a tapered shape above the side wall portion 11. A flat surface 13 is formed at the upper end of the distal end portion 12. The flat surface 13 is formed below the upper surface of the workpiece W in which the reference hole WH is formed. The side wall portion 11 is formed to have the same outer diameter as the hole diameter WD of the reference hole WH and is fitted to the reference hole WH to define the workpiece W at a predetermined position.

  Four concave grooves 2 are formed at equal intervals in the circumferential direction on the tapered surface of the distal end portion 12. The concave groove 2 is located in the vicinity of the lower end of the distal end portion 12 and includes a nozzle portion 21 formed in a horizontal shape and a guide portion 22 formed in a tapered shape upward from the nozzle portion 21. The height of each nozzle part 21 is substantially the same. The height of the upper end of each guide part 22 is also substantially the same. A circular discharge hole 3 for discharging the cleaning liquid CS is formed in the center of each nozzle portion 21. The discharge directions 4 of the four discharge holes 3 are formed toward the upper center 41 of the positioning pin 1 so that the cleaning liquid CS discharged from the discharge holes 3 collides with each other. The cleaning liquid CS that has collided diffuses outward from the diameter WD of the reference hole WH.

  Further, the positioning pin 1 is formed with one main supply path 6 for supplying the cleaning liquid CS to the discharge hole 3 and a plurality of sub supply paths 5. The main supply path 6 is formed so as to be connectable to a cleaning liquid supply apparatus (not shown), and each sub supply path 5 is formed so as to communicate the main supply path 6 and each discharge hole 3. The hole diameter of each sub supply path 5 and the hole diameter of each discharge hole 3 are all formed to be the same, and the cleaning liquid CS supplied from the cleaning liquid supply device is equally supplied to each discharge hole 3.

<Method for preventing foreign matter from entering by cleaning liquid>
Next, a method for preventing the entry of foreign matter by discharging the cleaning liquid CS from the discharge hole 3 of the positioning pin 1 will be described with reference to FIGS. FIG. 5 shows a side view when the workpiece reference hole is inserted into the positioning pin shown in FIG. FIG. 6 is a flow chart for removing foreign substances from the positioning pins shown in FIG.

  As shown in the foreign substance removal flowchart S of FIGS. 5 and 6, the cleaning liquid CS is supplied from the main supply path 6 to the tip portion 12 of the positioning pin 1 (S1). The cleaning liquid CS supplied to the distal end portion 12 of the positioning pin 1 is discharged from the discharge hole 3 toward the upper center 41 of the positioning pin 1 via the sub supply path 5 (S2). Since the hole diameter of each sub supply path 5 and the hole diameter of each discharge hole 3 are all the same, the flow velocity V of the cleaning liquid CS flowing through each discharge hole 3 via each sub supply path 5 is substantially the same. is there.

  The cleaning liquid CS discharged from each discharge hole 3 toward the upper center 41 collides with each other while diffusing upward and circumferentially along the guide 22 (S3). When the cleaning liquid CS collides with each other, the traveling direction spreads in a substantially conical shape around the distal end portion of the positioning pin 1, and is diffused in a wide area outward from the hole diameter WD of the reference hole WH (S4). The supply amount and supply pressure of the cleaning liquid CS supplied from the main supply path 6 of the positioning pin 1 to the distal end portion 12 are set to such an extent that the cleaning liquid CS can collide with each other and diffuse in a wide range.

  The workpiece W is lowered in a state where the cleaning liquid CS is diffused widely outside the hole diameter WD of the reference hole WH (S5). Foreign matter adhering to the lower surface WB of the workpiece W and the reference hole WH is washed away by the cleaning liquid CS diffused widely outside the hole diameter WD of the reference hole WH, and between the positioning pin 1 and the reference hole WH. Intrusion of foreign matter can be prevented (S6). Even during processing of the workpiece W, supplying the cleaning liquid CS to the positioning pin 1 can prevent foreign matter generated during processing from entering between the positioning pin 1 and the reference hole WH.

<Other embodiments of positioning pins>
Next, other embodiments (1) and (2) of the positioning pins in the positioning jig will be described with reference to FIGS. FIG. 7 shows a side view of another embodiment (1) of the positioning pin shown in FIG. FIG. 8 shows a plan view of another embodiment (2) of the positioning pin shown in FIG. FIG. 9 shows a flowchart of foreign matter removal of the positioning pins shown in FIG.

[Other Examples (1)]
As shown in FIG. 7, in another embodiment (1) of the positioning pin 1B, the hole diameter 3B of the discharge hole 3 located on the worker M side is different from the other discharge holes (discharge holes located on the counter worker side). 3) is smaller than 3A. In addition, the four discharge holes 3 are formed in the taper surface of the front-end | tip part 12 of the positioning pin 1B at equal intervals in the circumferential direction. Further, the discharge directions 4 of the four discharge holes 3 are formed toward the upper center 41 of the positioning pin 1 so that the cleaning liquid CS discharged from the discharge holes 3 collides with each other.

  Since the hole diameter 3B of the discharge hole 3 positioned on the worker M side is formed smaller than the hole diameter 3A of the other discharge holes 3, the flow velocity V2 of the cleaning liquid CS flowing through the discharge hole 3 positioned on the worker M side is It becomes larger than the flow velocity V1 of the cleaning liquid CS flowing through the other discharge holes 3. Therefore, the cleaning liquid CS discharged from the discharge hole 3 located on the worker M side tends to proceed more in the discharge direction even after colliding with the cleaning liquid CS discharged from the other discharge holes 3. The cleaning liquid CS hardly diffuses to the worker M side. Specifically, the inclination angle θ2 with respect to the horizontal direction of the cleaning liquid laminar flow CS2 diffused toward the worker M side is larger than the inclination angle θ1 with respect to the horizontal direction of the cleaning liquid laminar flow CS1 diffused toward the counter worker side.

[Other embodiment (2)]
As shown in FIG. 8, in another embodiment (2) of the positioning pin 1C, the distal end portion 12 formed in a tapered shape has the discharge direction 4 formed toward the upper center of the positioning pin 1C. In addition to the four discharge holes 3, a new sub supply path 7 and a new discharge hole 8 formed obliquely upward in the circumferential direction are provided. As with the other four discharge holes 3, the cleaning liquid CS is also supplied to the new discharge holes 8 from the main supply path 6 via the sub supply path 7. The discharge direction 9 of the new discharge hole 8 is formed so that the cleaning liquid CS discharged from the discharge hole 8 rotates spirally along the inner peripheral surface of the reference hole WH.

  The foreign matter removal flowchart Q shown in FIG. 9 is obtained by adding a reference hole cleaning step (Q6) by spiral up to the foreign matter removal flowchart S shown in FIG. By adding the step (Q6), the cleaning liquid CS discharged from the new discharge hole 8 spirally turns along the inner peripheral surface of the reference hole WH and remains or enters the reference hole WH. Can be easily discharged from the reference hole WH. Therefore, the cleaning effect of the workpiece W around the distal end portion of the positioning pin 1C can be further enhanced.

  In the foreign matter removal flowchart Q shown in FIG. 9, the cleaning liquid supply step (Q1), the cleaning liquid discharge step (Q2) from the discharge hole, the step of causing the cleaning liquids to collide (Q3), the cleaning liquid diffusion step (Q4), and the workpiece lowering step ( Q5), the foreign matter intrusion prevention step (Q7) is common to the corresponding step of the foreign matter removal flowchart S shown in FIG.

<Effect>
As described above in detail, according to the positioning jig 10 according to the present embodiment, the distal end portion 12 of the positioning pin 1 is provided with the plurality of discharge holes 3 for discharging the cleaning liquid CS, and the discharge holes 3 Since the discharge direction 4 of the discharge hole 3 is formed so that the discharged cleaning liquid CS collides with each other, the cleaning liquid CS can be diffused over a wide range by the collision of the cleaning liquid CS with each other. Therefore, the cleaning liquid CS diffused over a wide range can enhance the cleaning effect of the workpiece W around the distal end portion 12 of the positioning pin 1.
Further, since the cleaning liquid CS discharged from the discharge holes 3 is diffused over a wide range, there is no need to increase the diameter of the discharge holes 3 or increase the number of holes. Therefore, the strength of the positioning pin 1 can be maintained at a desired strength.
Therefore, according to the present embodiment, the cleaning liquid CS is diffused over a wide area around the distal end portion 12 of the positioning pin 1 while ensuring the strength of the positioning pin 1, thereby cleaning the workpiece W around the distal end portion of the positioning pin 1. Can be increased.

Further, according to the present embodiment, the discharge direction 4 of each discharge hole 3 is formed toward the upper center 41 of the positioning pin 1, so that the cleaning liquid CS discharged from each discharge hole 3 is transferred to the positioning pin 1. 1 can collide with each other in the vicinity of the central portion. Therefore, the colliding cleaning liquid CS spreads in an inverted conical shape with respect to the vicinity of the center portion of the positioning pin 1 and can be diffused around the positioning pin 1 without any problem.
As a result, the cleaning liquid CS can be diffused widely and uniformly around the distal end portion 12 of the positioning pin 1, and the cleaning effect of the workpiece W around the distal end portion of the positioning pin 1 can be further enhanced.

Further, according to the present embodiment, the discharge hole 3 is located on the worker M side because the hole diameter 3B of the discharge hole 3 located on the worker M side is formed smaller than the hole diameter 3A of the other discharge holes 3. The cleaning liquid CS discharged from the discharge holes 3 is discharged at a higher speed than the cleaning liquid CS discharged from the other discharge holes 3. Therefore, the cleaning liquid CS discharged from the discharge hole 3 located on the worker M side tends to travel more in the discharge direction 4 even after colliding with the cleaning liquid CS discharged from the other discharge holes 3. The cleaning liquid CS is difficult to diffuse to the worker M side.
As a result, it is possible to enhance the cleaning effect of the workpiece W around the tip end portion of the positioning pin 1B while appropriately maintaining the working environment on the worker M side.

  The present invention relates to, for example, a workpiece positioning jig used in a machine tool, and in particular, can be used as a positioning jig provided with a mechanism for preventing a foreign substance from entering by discharging a cleaning liquid from a tip portion of a positioning pin.

DESCRIPTION OF SYMBOLS 1 Positioning pin 2 Groove 3 Discharge hole 3A, 3B Hole diameter 4 Discharge direction 5 Sub supply path 6 Main supply path 7 Sub supply path 8 Discharge hole 9 Discharge direction 10 Positioning jig 11 Side wall part 12 Tip part 21 Nozzle part 22 Guide Part 41 Upper center part CS Cleaning liquid W Workpiece WH Reference hole

Claims (3)

A positioning jig provided with a positioning pin that is inserted into a reference hole of a workpiece and defines the position of the workpiece,
The positioning pin is characterized in that a plurality of discharge holes for discharging cleaning liquid are provided at the tip of the positioning pin, and the discharge direction of the discharge holes is formed so that the cleaning liquid discharged from the discharge holes collides with each other. Jig. In the positioning jig according to claim 1,
The positioning jig, wherein a discharge direction of the discharge hole is formed toward a position above a center portion of the positioning pin. In the positioning jig according to claim 1 or 2,
The positioning jig, wherein the discharge hole is formed such that a hole diameter of a discharge hole located on an operator side is smaller than a hole diameter of other discharge holes.

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