KR102176501B1 - Post treatment device for bolt screw thread - Google Patents

Abstract

The present invention relates to a surface post-processing device of a plated bolt, and more particularly, to a two-axis surface post-processing device of a plated bolt for improving precision by pressing a plated layer to have a certain thickness. The two-axis surface post-processing device of a plated bolt comprises: a bed; a fixed block fixedly installed on the bed; a moving block installed to face the fixed block and reciprocating from the bed to the fixed block; circular fixed dies installed in the fixed block and having an axis in a front-and-back direction; circular moving dies installed in the moving block and having an axis in a front-and-back direction; and a seating part placed between the fixed dies and the moving dies, and maintaining a constant distance from the fixed dies so that a bolt can be placed on the top thereof, wherein the fixed dies and the moving dies have a cylindrical shape, have an outer periphery on which a screw thread is formed, are installed to move back and forth along the axis, and have a compression spring on a rear surface thereof. Therefore, the present invention can adjust the position of a support on which the bolt is placed, thereby providing an effect of operating without replacing the fixed dies and the moving dies even if the type of the bolt is changed.

Description

Two-axis surface post treatment device for plated bolts {Post treatment device for bolt screw thread}

The present invention relates to an apparatus for post-treating the surface of a plated bolt, and more particularly, to a biaxial surface post-treatment apparatus for a plated bolt that improves precision by pressing a plated plated layer to a certain thickness.

In general, bolts are made of metal and may require plating on the surface depending on the environment in which they are used. There are many types of plating, but in the case of hot-dip galvanizing, the thickness of the plating layer is not constant because the bolts are immersed in molten zinc and then collected. In this case, a thick coating layer is applied to the narrow area between the valleys of the threads with very narrow gaps. For this reason, if the plated bolt is fastened, the precise fastening is not made. Therefore, the plated bolt undergoes a process of making the thickness of the plating layer constant through a surface post-treatment device.

In the conventional surface post-treatment device, one die and two pressure rollers that pressurize the side of the bolt by conveying it toward the mounting part where the supplied bolt is placed are radially installed in three directions based on the mounting part, and the die is made of a cylinder. A thread corresponding to the thread is formed on the outer periphery. With this structure, when the die and the pressing roller rotate in the same direction and transfer in the direction of the supplied bolt to press the threaded portion of the bolt, the thread of the die is inserted corresponding to the thread of the bolt and pressurized, thereby forming the plating layer applied to the bolt thread. The thickness of becomes constant.

However, by the repeated process, the surface of the pressure roller is worn by the thread of the bolt. Since the pressure roller is made of urethane, synthetic resin, etc., which have self-elastic resilience, wear is bound to occur, and the form of wear is formed with grooves having an inclination such as a screw thread of a bolt. These grooves are formed in different positions by repeated work, and when the bolt is pressed, the screw thread of the bolt tries to be positioned in the groove formed on the surface, and the phenomenon of unstable pressing occurs due to the phenomenon of forcibly adjusting the position of the bolt. As the die does not match the thread position, the operation stops. As such, when the pressure roller starts to wear, the production rate of the bolts rapidly decreases, and the pressure roller needs to be replaced, so that the life of the pressure roller is very short and maintenance costs are high.

A bolt surface post-treatment device that solves this problem has been registered as Patent No. 10-1892439 by the present applicant, and its structure is as follows.

A seat on which the bolt is placed; One fixed die and two moving dies which are installed in three directions radially around the seating portion and rotated and conveyed toward the seating portion to press the thread of the bolt; Including, wherein the fixed die and the flow die are formed in a cylindrical shape, a thread is formed on the outer periphery thereof, the flow die is installed to move up and down around a vertical axis, and a compression spring is installed at the bottom.

As such, the three dies have threads formed on the surface, and as the moving dies can move up and down, the bolts and the threads of the moving dies automatically locate their positions based on the fixed dies, so that good products are continuously maintained without stopping during operation. There is an effect that can be produced.

However, if the length of the bolt is different, there is an inconvenience of having to replace both the fixed die and the floating die according to the length of the bolt.

KR Registered Patent Publication No. 10-1892439 (2018.08.22)

The present invention was invented to solve the problems as in the prior art, and an object of the present invention is to provide a biaxial surface post-treatment apparatus of a plated bolt capable of working without replacing the dies even if the length of the bolt is changed.

The biaxial surface post-treatment device of a plated bolt according to the present invention for achieving the above object,

Bed;

A fixed block fixedly installed on the bed;

A flow block installed facing the fixed block and reciprocating from the bed to the fixed block direction;

A circular fixed die installed on the fixed block and having an axial direction forward and backward;

A circular flow die installed on the flow block and having an axial direction forward and backward;

A seating portion positioned between the fixed dies and the moving dies, but maintaining a constant distance from the fixed dies so that a bolt is placed on the top thereof; Including,

The fixed dies and the moving dies are formed in a cylindrical shape, a thread is formed at the outer periphery thereof, installed to move in a forward and backward direction along an axis, and a compression spring is installed on the rear surface.

In addition, the seating portion is a support frame fixedly installed on the bed so as to be horizontally positioned above the fixed dies and the moving dies;

A slider with a guide rod in the front-rear direction being adjusted by moving along the support frame to adjust the distance between the fixed dies;

A vertical rod movable in a front-rear direction from the guide rod of the slider and installed vertically downward;

A support horizontally provided at the bottom of the vertical bar and placed in a state in which the bolt is laid down; It characterized in that it includes.

In addition, a guide rail is installed in the direction of a fixed block on an upper part of the bed on which the movable block is installed, and the lower part of the movable block is inserted into the rail to slide.

In addition, the flow block is characterized in that the reciprocating transfer by a hydraulic cylinder.

In addition, a speed reducer is installed at the rear of the bed, a pair of shafts are installed from the speed reducer, and both shafts are connected to the flow dies and the flow dies respectively to transmit power, but a universal joint is installed on the shaft connected to the flow dies. It is characterized.

In the biaxial surface post-treatment device of the plated bolt according to the present invention, when the bolt is laid down by a seating portion located between the fixed die and the moving die, the fixed die and the moving die rotate and pressurize on both sides of the bolt. At the same time, as it can be moved in the front and rear direction, the bolt and the thread of the floating die automatically find their position based on the fixed die, and there is an effect that it can continuously produce good products.

In addition, since the guide portion can be moved in the front and rear direction, even if the length of the bolt is different, there is an effect that the fixed die and the moving die can be used without replacement.

1 is a perspective view showing a two-axis surface post-treatment device of a plated bolt according to the present invention.
Figure 2 is a front view showing a two-axis surface post-treatment apparatus of a plated bolt according to the present invention.

Hereinafter, a preferred embodiment of a biaxial surface post-treatment apparatus for a plated bolt according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a biaxial surface post-treatment apparatus for a plated bolt according to the present invention, and FIG. 2 is a front view showing a biaxial surface post-treatment apparatus for a plated bolt according to the present invention.

As shown in these figures, the biaxial surface post-treatment apparatus of the plated bolt according to the present invention includes a bed 10; A fixed block 20 fixedly installed on the bed 10; A flow block 30 installed facing the fixed block 20 and reciprocating from the bed 10 in the direction of the fixed block 20; A circular fixing die 40 installed on the fixing block 20 and having an axial direction forward and backward; A circular flow die 50 installed in the flow block 30 and having an axial direction forward and backward; A seating portion 60 which is positioned between the fixed die 40 and the floating die 50 but maintains a certain distance from the fixed die 40 so that the bolt B is placed on the top thereof; Includes.

The bed 10 is a body part supporting the apparatus of the present invention, and a fixed block 20, a flow block 30, and a reducer 70 to be described later are installed on the upper portion thereof.

The fixed block 20 and the flow block 30 are installed on the upper part of the bed 10 and are installed symmetrically to the left and right around the center. However, the fixed block 20 is fixedly installed on the bed 10, and the movable block 30 is installed to be reciprocally transferred from the bed 10 in the left-right direction, that is, in the fixed block 20 direction. One or more guide rails 11 are provided in the direction of the fixed block 20 in the upper part of the bed 10 in which the movable block 30 is installed, and a groove in which the guide rail 11 is fitted in the lower part of the movable block 30 31 is formed so that the flow block 30 is movable along the guide rail 11.

A hydraulic cylinder 32 is installed on one side of the flow block 30. One end of the hydraulic cylinder 32 is installed in the bed 10, and the other end is installed in the flow block 30 and is reciprocated in the direction of the fixed block 20 by pushing or pulling the flow block 30 by supplied hydraulic pressure. Is done.

The fixed block 20 and the movable block 30 are each provided with a pair of bearings 25 and 35 on the faces facing each other, and the shaft holes are installed on the same axis with a predetermined distance at the front and the rear. . In the bearings 25 and 35 installed in this way, the shaft hole is directed in the front-rear direction.

The fixed dies 40 and the moving dies 50 are respectively installed on the bearings 25 and 35 provided in the fixed block 20 and the moving block 30.

The fixed die 40 and the flow die 50 are formed in a cylindrical shape, and threads 41 and 51 are formed on the outer periphery thereof. Here, it is natural that the pitch of the threads 41 and 51 is the same as the pitch of the bolt B to be surface-treated.

In addition, the fixed dies 40 and the moving dies 50 have shaft holes 42 and 52 formed in the center so that the shaft S is installed therethrough. The shaft S passing through the fixed die 40 and the moving die 50, respectively, is installed in the shaft hole of the bearings 25 and 35. In addition, the fixed dies 40, the moving dies 50, and the shaft S are formed with key grooves 42 and 52 into which the key K is fitted, and the shaft S and the key K are forcibly fitted. The power of the shaft (S) that rotates while sliding in the direction of the shaft (S) by leaving a clearance with the key (K) and the key groove (42) (52) of the fixed die (40) and the moving die (50) It receives and rotates with the shaft (S).

The pair of bearings 25 and 35 are formed at intervals wider than the thickness of the fixed dice 40 and the flow dice 50, so that the fixed dice 40 and the flow dice 50 are provided with the bearings 25 and 35. Make it possible to move in the axial direction within. In addition, a compression spring (SP) is installed between the bearings 25 and 35 located at the rear of the fixed dies 40 and the moving dies 50. Accordingly, the fixed dies 40 and the flow dies 50 move in the axial direction, but remain in close contact with the front bearings 25 and 35 when there is no external force.

On the other hand, between the fixed dies 40 and the floating dies 50, a seating portion 60 for supporting the bolts (B) is installed. The seating portion 60 is composed of a support frame 61, a slider 62, a vertical rod 63, and a pedestal 64.

The support frame 61 is fixedly installed on the bed 10 so as to be horizontally positioned above the fixed dies 40 and the moving dies 50. This support frame 61 is made of a square tube or rod.

The slider 62 has a shape surrounding the support frame 61 and moves in a lateral direction along the support frame 61 to adjust the distance with the fixing dies 40, so that the position is adjusted according to the diameter of the bolt (B). It changes. And a tightening bolt is provided to prevent movement and rotation in the selected position. Further, on the rear surface of the slider 62, a guide rod 62' in the front-rear direction is formed to protrude to a predetermined length.

The vertical rod 63 has an elongated rod shape, and its upper end is inserted into the guide rod 62 ′ of the slider 62 and moves in the front and rear direction along the guide rod 62 ′. The location changes. This vertical rod 63 can also be fixed at a selected position by a tightening bolt.

The pedestal 64 is provided horizontally to the front below the vertical rod 63, and is placed in a state in which the bolt B is laid on the upper end thereof.

In addition, a reducer 70 is installed at the rear of the bed 10. A pair of shafts S are installed in front of the reducer 70, and the pair of shafts are connected to a motor (not shown) installed in the bed 10 to rotate at the same speed. And both shafts (S) are connected to the shaft (S) of the fixed dies 40 and the flow dies 50, respectively. However, a universal joint 90 is installed on the shaft S connected to the flow die 50 so that the power is smoothly transmitted even if the axial direction is not parallel as the flow die 50 reciprocates.

Finally, an inclined guide plate 80 is installed in the front lower part of the pedestal 64, and a container (not shown) is installed at the end of the guide plate 80, so that the bolts (B) subjected to the surface post-treatment are applied to the guide plate 80 To drop and put in the container.

The effect of the biaxial surface post-treatment device of a plated bolt according to the present invention having such a structure will be described in detail.

First, when the motor is driven, a pair of shafts rotate through the reducer 70, and the fixed dies 40 and the moving dies 50 connected thereto rotate at the same speed and in the same direction. At this time, the flow block 30 and the flow die 50 are reciprocated and rotated in the lateral direction along the lower rail by the hydraulic cylinder 32.

The operator holds the head of the bolt (B) to be surface-treated when the moving die 50 is away from the movable die 40 and puts it on the pedestal 64 of the seating portion 60. At this time, the raised bolt (B) has its end in close contact with the vertical rod (63) to prevent the bolt (B) from entering any more.

Then, the moment the moving die 50 contacts the bolt B while moving in the direction of the fixed die 40, the thread of the bolt B and the threads 41 and 51 of the fixed die 40 and the moving die 50 It automatically finds the position and matches, and when the operator releases the bolt (B), the bolt (B) rotates while being pressed against the rotating fixed dies 40 and the moving dies 50. At this time, since the fixed die 40 and the moving die 50 can move in the axial direction, they automatically move in the axial direction according to the thread of the bolt B and rotate. As for the rotating bolt (B), all irregular plating layers have a constant thickness by the fixed dies 40 and the moving dies 50.

And when the moving die 50 moves away from the fixed die 40 again, the rotating bolt (B) stops rotating and the center of the bolt (B) is at the head, so it freely falls on the guide plate 80 and falls into the container. Will be included.

If the length of the bolt (B) is changed and you want to change the position of the base (64), loosen the tightening bolt provided on the vertical rod (63) and slide it from the guide rod (62') to fit the length of the bolt (B). Adjust its position. Then tighten the tightening bolt again to fix it.

In this way, by simply adjusting the position of the pedestal 64, the bolts (B) of different lengths can also be surface-treated, so that the operation can be performed without replacing the fixed dies 40 and the moving dies 50.

10: bed 11: guide rail 20: fixed block
25, 35: bearing 30: floating block 31: groove
32: hydraulic cylinder 40: fixed dies 41, 51: thread
42, 52: shaft 43, 53: keyway 50: floating die
60: seating part 61: support frame 62: slider
62': guide rod 63: vertical rod 64: base
70: reducer 80: guide plate B: bolt
K: Key S: Shaft SP: Compression spring

Claims (5)

Bed 10; A fixed block 20 fixedly installed on the bed 10; A flow block 30 installed facing the fixed block 20 and reciprocating from the bed 10 in the direction of the fixed block 20; A circular fixing die 40 installed on the fixing block 20 and having an axial direction forward and backward; A circular flow die 50 installed in the flow block 30 and having an axial direction forward and backward; A seating portion 60 which is positioned between the fixed die 40 and the floating die 50 but maintains a certain distance from the fixed die 40 so that the bolt B is placed on the top thereof; Including,
The fixed dies 40 and the moving dies 50 are formed in a cylindrical shape, and threads 41 and 51 are formed on the outer periphery thereof, move in the front and rear direction along the axis, and are installed to rotate with the axis, and a compression spring on the rear surface thereof. (SP) is installed,
A guide rail 11 is installed in the direction of the fixed block 20 on the upper part of the bed 10 on which the movable block 30 is installed, and the lower part of the movable block 30 is inserted into the guide rail 11 and slides. , The flow block 30 is a two-axis surface post-treatment device of a plated bolt, characterized in that the reciprocating transfer by a hydraulic cylinder (32). Bed 10; A fixed block 20 fixedly installed on the bed 10; A flow block 30 installed facing the fixed block 20 and reciprocating from the bed 10 in the direction of the fixed block 20; A circular fixing die 40 installed on the fixing block 20 and having an axial direction forward and backward; A circular flow die 50 installed in the flow block 30 and having an axial direction forward and backward; A seating portion 60 which is positioned between the fixed die 40 and the floating die 50 but maintains a certain distance from the fixed die 40 so that the bolt B is placed on the top thereof; Including,
The fixed dies 40 and the moving dies 50 are formed in a cylindrical shape, and threads 41 and 51 are formed on the outer periphery thereof, move in the front and rear direction along the axis, and are installed to rotate with the axis, and a compression spring on the rear surface thereof. (SP) is installed,
A reducer (70) is installed at the rear of the bed (10), and a pair of shafts (S) are installed from the reducer (70), and both shafts (S) are on the fixed dies 40 and the moving dies 50. The two-axis surface post-treatment device of plated bolts, which is connected to each other so that power is transmitted, and a universal joint 90 is installed on the shaft S connected to the flow die 50.
The method of claim 1 or 2, wherein the seating portion (60),
A support frame 61 fixedly installed on the bed 10 so as to be horizontally positioned above the fixed dies 40 and the moving dies 50;
A slider 62 provided with a guide rod 62 ′ in the front-rear direction by adjusting the distance with the fixed die 50 by moving along the support frame 61;
A vertical rod 63 that is movable in the front and rear direction from the guide rod 62 ′ of the slider 62 and is vertically installed downward;
A pedestal 64 which is horizontally provided at the bottom of the vertical rod 63 and placed in a state in which the bolt B is laid down; A biaxial surface post-treatment device of a plated bolt, comprising: a.
The key groove (43) according to claim 1 or 2, wherein a key (K) fixed to the shaft (S) is inserted into the shaft hole (42) (52) of the fixed die (40) and the moving die (50). 53) is formed and rotated together with the axis (S), and the two-axis surface post-treatment device of the plated bolt, characterized in that it can move in the direction of the axis (S). delete

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