JP6944101B2 - Projection nut supply device - Google Patents

Description

In the present invention, the projection nut that has entered the temporary fixing chamber is received by a stopper member having a magnet and temporarily locked, and the advancing supply rod is passed through the screw hole of the projection nut and supplied to the target location. It relates to a projection nut supply device.

Hereinafter, in the present specification and claims, the projection nut may be simply referred to as a nut.

In Japanese Patent Publication No. 56-01134, when the nut held in the temporary fixing chamber is supplied onto the steel plate part by the supply rod, the advance side of the supply rod is set as the head portion made of a magnetic material over a predetermined length. It is described that the back side is the back of the head made of a non-magnetic material, and the magnet is arranged on the upper side of the temporary fixing chamber. When the head is magnetized by a magnet, the nut moves while being attracted to the tip of the supply rod, and when the nut reaches close to the steel plate part, the back of the head made of non-magnetic material is approaching the magnet. , The attractive magnetic force to the nut disappears, and the nut falls onto the steel plate part.

Special Publication No. 56-01134

In the technique described in the above patent document, since the nut is attracted to the tip of the leading portion, it is necessary to always maintain a magnetic force of a predetermined value or more at the tip of the leading portion. However, when the steel plate parts are located far away, it becomes difficult to sufficiently magnetize the tip of the leading portion, or the magnetic force at the tip of the leading portion decreases in proportion to the advance length. There is a problem that the nut falls before it reaches the steel plate part. That is, the timing of placing the nut on the steel plate component cannot be kept uniform, and the nut supply becomes unstable.

Further, when joining the head portion made of a magnetic material and the back head made of a non-magnetic material, various methods such as welding and screwing can be considered, but welding of a foreign material needs to be performed extremely carefully, which is not desirable in terms of process. The screw-in structure has a problem that it is structurally unfavorable because it requires screwing and locking. It is necessary to finish it smoothly so that no protrusions are formed at the joint between the front part and the back of the head, but in order to satisfy it, a special manufacturing technique must be used. Further, when a force in the bending direction acts on the supply rod for some reason, stress is concentrated at the joint portion between the front portion and the back of the head, so it is better to avoid the joint itself in the rod body.

The present invention has been provided to solve the above problems by forming a magnetized section in the advancing / retreating region of the extrusion portion of the supply rod to improve the holding stability of the nut and to set the downhill start time of the guide rod. The purpose is to make it uniform.

The invention according to claim 1
A temporary fixing chamber for temporarily locking the nut is formed by providing a stopper member at a position where the supply pipe of the projection nut and the guide pipe of the advancing / retreating operation type supply rod are connected in an intersecting state.
In the stopper member, a magnet for pulling the nut from the supply pipe into the temporary fixing chamber and temporarily locking the nut in the temporary fixing chamber is arranged on an extension line in the transport direction of the supply pipe.
The supply rod slides between a guide rod made of a non-magnetic material that penetrates the screw hole of the nut and slides the nut down over a predetermined distance, and a support hole provided in the guide tube having a diameter larger than that of the guide rod. Consists of a sliding rod made of magnetic material
A fitting hole having a diameter slightly smaller than the diameter of the guide rod is formed in the center of the sliding rod, and the guide rod is press-fitted into the fitting hole to integrate the guide rod and the sliding rod.
A receiving groove in the circumferential direction is provided in the guide rod, and the outer peripheral portion of the sliding rod is pressed after press fitting to form a bulging portion in which the material of the sliding rod is bulged into the space of the receiving groove.
An extruded portion that applies an extruding force to the nut is formed at the boundary between the guide rod and the sliding rod.
When the extruded portion passes in the vicinity of the magnet at the time of advancing the supply rod, the nut is temporarily attracted to the extruded portion due to the magnetization of the extruded portion, and the nut is flipped from the extruded portion. By further advancing the supply rod, the extruded portion is separated from the magnet and its attractive force is extinguished, so that the nut slides down the guide rod without receiving the attractive force by the magnet. It is a projection nut supply device that is configured to form a magnetized section of the extruded portion.

On the stopper member, a magnet that draws a nut from the supply pipe into the temporary fixing chamber is arranged on an extension line in the transport direction of the supply pipe. That is, the magnet is arranged on one side of the supply rod when the supply rod advances. The sliding rod is made of a magnetic material, and the guide rod is made of a non-magnetic material. For this reason, the magnet has the function of pulling the nut into the temporary fixing chamber and the function of temporarily locking the nut into the temporary fixing chamber, and when the extrusion portion passes near the magnet when the supply rod advances, a certain advance section near the magnet Enters the magnetic field of the magnet, so that the extruded portion becomes a magnetized section. That is, a magnetization section is formed in the advancing / retreating range of the extruded portion as seen in the stroke direction of the supply rod.

Therefore, when the extruded portion hits the nut when the supply rod advances, the extruded portion has an attractive force, so that the nut is not blown off and the nut is attracted to the extruded portion during the magnetization section. It will be in a state of being. That is, the nut moves while rubbing the stopper member by the suction action of temporarily locking the nut, and the suction force of the extruded portion is added to the suction force, so that the phenomenon that the nut is flipped off does not occur.

When the supply rod further advances and the nut deviates from the magnetized section, the nut slides down the guide rod from this point and reaches the target location. Since the attractive magnetic force with respect to the nut disappears when the nut enters the non-magnetized section from the magnetized section in this way, the nut starts to slide down along the guide rod from this point. Therefore, the start point of downhill of the guide rod of the nut is made uniform, and when the advance position of the supply rod reaches a predetermined position, the nut surely starts downhill from that position, whereby the nut is always constant. The downhill will start from the time of, and the nut supply to the target location will be executed at the accurately determined timing, and the nut supply with high reliability will be realized.

In particular, since the guide rod is made of a non-magnetic material, when the extruded part made of a magnetic material passes through the magnetized section, the magnet attraction force on the nut disappears immediately, and the nut sliding down surely starts at the same time as passing through the magnetized section. Therefore, the magnetic attraction force that hinders the sliding down is not completely generated. The start point of the magnetization section is the place where the extruded portion enters the magnetic field of the magnet, and the end point of the magnetization section is the place where the extruded part goes out of the magnetic field of the magnet. As a result, the start and end points of the magnetization section are clearly set, so that the nut attraction force is generated and ended with moderation.

Since the magnetized section exists in the stroke section near the magnet, the section where the magnet attraction force of the extruded portion is generated can be clearly formed.

Since the start time of the nut sliding down on the guide rod is set uniformly, it is possible to accurately and easily determine the length of the guide rod in correlation with the advance speed of the supply rod.

Since the sliding rod is formed as a single seamless member, there is no strength problem such as stress concentration even if an external force in the bending direction acts. Further, in the joint structure between the guide rod and the sliding rod, the guide rod is press-fitted into the fitting hole formed in the center of the sliding rod , and the guide rod is provided with a receiving groove in the circumferential direction, and after press-fitting. By pressurizing the outer peripheral portion of the sliding rod, a bulging portion is provided in which the material of the sliding rod is bulged into the space of the receiving groove. Therefore, the integralness of the guide rod and the sliding rod can be ensured under high coupling rigidity.

Since the nut is pulled into the temporary fixing chamber and the magnetization section is formed by one magnet, it is effective in terms of structural simplification and cost reduction.

The invention of the present application is the device invention as described above, but as is clear from the examples described below, it can exist as a method invention that specifies the nut transfer process and the like.

It is sectional drawing of the whole apparatus and the external view of the part part. It is sectional drawing which shows the partial part part of the supply rod. It is a side view which shows the advance operation of a supply rod.

Next, a mode for carrying out the projection nut supply device of the present invention will be described.

1 to 3 show examples of the present invention.

First, the projection nut will be described.

The iron projection nut 1 has a screw hole 3 formed in the center of a square nut body 2, and welding protrusions 4 are provided at four corners on one side. The cross-sectional shape of the nut 1 is shown in FIG. 3A for easy viewing.

Next, the supply rod will be described.

In the supply rod 5, a guide rod 6 penetrating the screw hole 3 of the nut 1 and a sliding rod 7 having a diameter larger than that of the guide rod 6 are integrated in a straight line. The guide rod 6 is made of a non-magnetic material such as stainless steel, and the sliding rod 7 is made of a magnetic material such as steel.

At the boundary between the guide rod 6 and the sliding rod 7, an extruded portion 11 for applying an extruding force to the nut 1 is formed. The extruded portion 11 is a flat surface, and this flat surface exists on a virtual plane in which the central axes of the supply rod 5 intersect vertically, as shown in FIG. 1 (C). FIG. 1D shows a modified example of the extruded portion 11. This is composed of a tapered surface instead of the above-mentioned flat surface. At the time of extrusion, the tapered surface hits the opening angle of the screw hole 3 to deliver the nut.

As shown in FIG. 2A, the guide rod 6 is press-fitted into the sliding rod 7 to integrate the two. A fitting hole 23 having a diameter slightly smaller than the diameter of the guide rod 6 is formed in the center of the sliding rod 7, and the guide rod 6 is press-fitted therein. Normally, the integration of the two can be maintained by such press-fitting, but in order to further ensure it, there is a structure shown in FIG. 2 (B). This is because the guide rod 6 is provided with a receiving groove 28 in the circumferential direction, and the material of the sliding rod 7 is bulged into the space of the receiving groove 28 by pressurizing the outer peripheral portion of the sliding rod 7 after press fitting. There is. Reference numeral 29 indicates a pressure mark on the outer peripheral portion, and reference numeral 30 indicates a bulging portion.

The supply rod 5 is housed in the guide pipe 8 and moves back and forth by an air cylinder 9 coupled to the guide pipe 8. A support hole 10 is formed in the guide tube 8, and a sliding rod 7 is inserted so as to slide on the inner surface of the support hole 10. The guide tube 8 is coupled to a stationary member 12 such as a machine frame of the device.

The supply rod 5 is tilted 45 degrees with respect to the horizontal plane, and the supply pipe 13 in a posture orthogonal to the supply rod 5 is also tilted 45 degrees.

Next, the temporary fixing room will be described.

The metal supply pipe 13 has a square cross section in space to match the shape of the nut 1, and its tip is welded to the tip of the guide pipe 8. The part painted in black is the welded part. As shown in FIG. 1, the supply pipe 13 and the guide pipe 8 are connected in an intersecting state, and the temporary fixing chamber 15 is formed by providing the stopper member 14 at the connecting portion. The bottom of the supply pipe 13 on the distal end side is cut off to form the outlet opening 16 of the temporary fixing chamber 15. The nut 1 sent out from the parts feeder 17, which is a parts supply source, is guided to the temporary fixing chamber 15 via the supply pipe 13.

The temporary fixing chamber 15 communicates with the support hole 10 through a through hole 18 formed in the upper surface of the supply pipe 13, so that the supply rod 5 can pass through the temporary fixing chamber 15.

Next, the stopper member will be described.

The stopper member 14 is a thick plate-shaped member. The lower end of the guide tube 8 is scraped off to form a flat surface 19, and the stopper member 14 is attached by pressing the stopper member 14 against the flat surface 19. The support member 20 is welded to the outer surface of the guide tube 8, and the stopper member 14 is pressed against the flat surface 19 by tightening the fixing bolt 21 screwed therein. Reference numeral 22 is a locknut for preventing loosening.

In the stopper member 14, a receiving hole 25 is formed in the thick plate 24, a permanent magnet 26 is fitted therein, and the permanent magnet 26 is sealed by a cover plate 27 attached by welding to both sides of the thick plate 24.

The permanent magnet 26 is arranged on an extension line of the supply pipe 13 in the transport direction, pulls the nut 1 from the supply pipe 13 into the temporary fixing chamber 15, and temporarily locks the nut 1 to the temporary fixing chamber 15. The attachment position of the stopper member 14 is set so that the screw hole 3 of the temporarily locked nut 1 stops at a position coaxial with the supply rod 5.

Next, the magnetization section will be described.

When the extrusion portion 11 passes in the vicinity of the permanent magnet 26 when the supply rod 5 is advanced, a certain advance section in the vicinity of the permanent magnet 26 enters the magnetic field of the permanent magnet 26, so that the extrusion portion 11 is magnetized. The section in which the extruded portion 11 exists in the magnetic field of the permanent magnet 26 is the magnetization section L. That is, the magnetization section L is formed in the advancing / retreating range of the extruded portion 11 as viewed in the stroke direction of the supply rod 5. The start point of the magnetization section L is the place where the extrusion portion 11 enters the magnetic field of the permanent magnet 26, and the end point of the magnetization section L is the place where the extrusion portion 11 goes out of the magnetic field of the permanent magnet 26.

In the magnetized section L of the extruded portion 11, when the extruded portion 11 passes near the permanent magnet 26 when the supply rod 5 is advanced, the extruded portion 11 is magnetized, so that the nut 1 is temporarily extruded. The nut 1 is attracted to the permanent magnet 11 so that the nut 1 is not blown off from the extrusion portion 11, and the supply rod 5 further advances, so that the extrusion portion 11 is separated from the permanent magnet 26 and its attractive force disappears. 1 is formed so as to slide down the guide rod 6 in a state where the guide rod 6 is not subjected to the attractive force of the permanent magnet 26.

The steel plate component 32 is placed on the fixed electrode 31, and the nut 1 is supplied to the guide pin 33 protruding from the steel plate component 32. The movable electrode paired with the fixed electrode 31 is not shown.

The length of the magnetization section L can be changed by adjusting the magnetic force of the permanent magnet 26.

Next, the supply operation will be described.

FIG. 3A shows a temporarily locked state in which the nut 1 is attracted to the stopper member 14 by the permanent magnet 26. At this stage, the supply rod 5 is in the most retracted position, the tip of the guide rod 6 stands by in front of the screw hole 3, and the extrusion portion 11 is located far away from the magnetic field of the permanent magnet 26. Therefore, the extruded portion 11 is not magnetized at this stage.

FIG. 3B is a stage in which the supply rod 5 advances, the guide rod 6 penetrates the screw hole 3, the extruded portion 11 begins to enter the magnetic field of the permanent magnet 26, and magnetization is started. Is the starting point of. A suction force is generated in the extruded portion 11 from this position. FIG. 1B shows this stage.

In FIG. 3C, the supply rod 5 further advances, the nut 1 is attracted to the extrusion portion 11 and moves while rubbing the surface of the stopper member 14, and then the extrusion portion 11 reaches the end portion of the magnetization section L. It is the stage where it was done. In the transitional period in which the nut 1 is sucked by the extruded portion 11 and moves while rubbing the stopper member 14, the nut 1 is not blown off and is held by the supply rod 5. As soon as the extruded portion 11 is separated from the magnetized section L by advancing a little further from the position shown in the figure, the magnet attraction force to the nut 1 disappears, and the nut 1 starts sliding down along the guide rod 6.

FIG. 3D shows a stage in which the supply rod 5 is fully extended and the tip of the guide rod 6 comes immediately before the guide pin 33 of the fixed electrode 31, and the nut 1 falls toward the guide pin 33 and is the guide pin. 33 enters the screw hole 3.

Instead of the air cylinder 9 described above, an electric motor that outputs forward and backward output can also be adopted. It is also possible to replace the permanent magnet 26 with an electromagnet.

The effects of the examples described above are as follows.

A permanent magnet 26 that draws the nut 1 from the supply pipe 13 into the temporary fixing chamber 15 is arranged on the stopper member 14 on an extension line in the transport direction of the supply pipe 13. That is, the permanent magnet 26 is arranged on one side of the supply rod 5 when the supply rod 5 advances. The sliding rod 7 is made of a magnetic material, and the guide rod 6 is made of a non-magnetic material. Therefore, the permanent magnet 26 has a function of pulling the nut 1 into the temporary fixing chamber 15 and a function of temporarily locking the nut 1 into the temporary fixing chamber 15, and the extrusion portion 11 passes in the vicinity of the permanent magnet 26 when the supply rod 5 advances. At this time, since a certain advance section near the permanent magnet 26 enters the magnetic field of the permanent magnet 26, the extrusion portion 11 becomes a magnetized section L that is magnetized. That is, the magnetization section L is formed in the advancing / retreating range of the extruded portion 11 as viewed in the stroke direction of the supply rod 5.

Therefore, when the extruded portion 11 hits the nut 1 when the supply rod advances, the extruded portion 11 has an attractive force, so that the nut 1 is not blown off and the nut 1 is in the magnetization section L. Is in a state of being adsorbed on the extruded portion 11. That is, the nut 1 moves while rubbing the stopper member 14 due to the suction action of temporarily locking the nut 1, and the suction force of the extruded portion 11 is added to the movement, so that the nut 1 is flipped off. Will not.

When the supply rod 5 further advances and the nut 1 deviates from the magnetization section L, the nut 1 slides down the guide rod 6 and reaches the target location from this point. Since the attractive magnetic force with respect to the nut 1 disappears when the nut 1 enters the non-magnetized section from the magnetized section L in this way, the downhill of the nut 1 along the guide rod 6 is started from this point. Therefore, the downhill start time of the guide rod 6 of the nut 1 is made uniform, and when the advance position of the supply rod 5 reaches a predetermined position, the nut 1 surely starts downhill from that position. The nut 1 always starts downhill from a certain time, and the nut supply to the target location is executed at an accurately determined timing, and a highly reliable nut supply is realized.

In particular, since the guide rod 6 is made of a non-magnetic material, when the extruded portion 11 made of a magnetic material passes through the magnetized section L, the magnet attraction force with respect to the nut 1 immediately disappears, and the nut sliding down passes through the magnetized section. At the same time, it is surely started, and the magnetic attraction force that hinders the sliding is not completely generated. The start point of the magnetization section L is the place where the extrusion portion 11 enters the magnetic field of the permanent magnet 26, and the end point of the magnetization section L is the place where the extrusion portion 11 goes out of the magnetic field of the permanent magnet 26. As a result, the start and end points of the magnetization section L are clearly set, so that the nut attraction force is generated and ended with moderation.

Since the magnetization section L exists in the stroke section near the permanent magnet, the magnet attraction force generation section of the extrusion portion 11 can be clearly formed.

Since the downhill start time of the nut 1 on the guide rod 6 is set uniformly, the length of the guide rod 6 can be accurately and easily obtained in correlation with the advance speed of the supply rod 5.

Since the sliding rod 7 is formed as one seamless member, there is no strength problem that stress is concentrated even if an external force in the bending direction acts. Further, in the joint structure between the guide rod 6 and the sliding rod 7, the guide rod 6 is press-fitted into the fitting hole 23 formed in the central portion of the sliding rod 7 , and the guide rod 6 is received in the circumferential direction. A groove 28 is provided, and a bulging portion 30 is provided in which the material of the sliding rod 7 is bulged into the space of the receiving groove by pressurizing the outer peripheral portion of the sliding rod 7 after press fitting. Therefore, the integralness of the guide rod 6 and the sliding rod 7 can be ensured under high coupling rigidity.

Since the pulling of the nut 1 into the temporary fixing chamber 15 and the formation of the magnetization section L are established by one permanent magnet 26, it is effective in terms of structural simplification and cost reduction.

As described above, according to the apparatus of the present invention, a magnetization section is formed in the advancing / retreating region of the extrusion portion of the supply rod to improve the holding stability of the nut and to make the downhill start timing of the guide rod uniform. Therefore, it can be used in a wide range of industrial fields such as a body welding process for automobiles and a sheet metal welding process for home appliances.

1 Projection nut 2 Nut body 3 Screw hole 4 Welding protrusion 5 Supply rod 6 Guide rod 7 Sliding rod 8 Guide pipe 10 Support hole 11 Extruded part 13 Supply pipe 14 Stopper member 15 Temporary fixing chamber 23 Fitting hole 26 Permanent magnet L Magnetization section

Claims (1)

A temporary fixing chamber for temporarily locking the nut is formed by providing a stopper member at a position where the supply pipe of the projection nut and the guide pipe of the advancing / retreating operation type supply rod are connected in an intersecting state.
In the stopper member, a magnet for pulling the nut from the supply pipe into the temporary fixing chamber and temporarily locking the nut in the temporary fixing chamber is arranged on an extension line in the transport direction of the supply pipe.
The supply rod slides between a guide rod made of a non-magnetic material that penetrates the screw hole of the nut and slides the nut down over a predetermined distance, and a support hole provided in the guide tube having a diameter larger than that of the guide rod. Consists of a sliding rod made of magnetic material
A fitting hole having a diameter slightly smaller than the diameter of the guide rod is formed in the center of the sliding rod, and the guide rod is press-fitted into the fitting hole to integrate the guide rod and the sliding rod.
A receiving groove in the circumferential direction is provided in the guide rod, and the outer peripheral portion of the sliding rod is pressed after press fitting to form a bulging portion in which the material of the sliding rod is bulged into the space of the receiving groove.
An extruded portion that applies an extruding force to the nut is formed at the boundary between the guide rod and the sliding rod.
When the extruded portion passes in the vicinity of the magnet at the time of advancing the supply rod, the nut is temporarily attracted to the extruded portion due to the magnetization of the extruded portion, and the nut is flipped from the extruded portion. By further advancing the supply rod, the extruded portion is separated from the magnet and its attractive force is extinguished, so that the nut slides down the guide rod without receiving the attractive force by the magnet. A projection nut supply device configured to form a magnetized section of an extruded portion.

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