JPS61202722A - Working installation of taper rod - Google Patents

Abstract

PURPOSE:To prevent a slip and to obtain a taper rod having accurate shape and dimensions by vertically sliding a reduction roll provided to a variable-speed tension roll device through a link member and driving the roll through an universal coupling. CONSTITUTION:In a working installation of a taper rod, a reduction roll 20 and a holding roll 21 are provided to a tension roll device to reduce a wire size. The roll 21 is fixed to a machine frame 25 through bearings, and the roll 20 is set freely slidably in the vertical direction with respect to the frame 25 through bearings 23. That is, when a reduction body 33 is vertically moved by extending and contracting a press driving body 32, the reduction roll 20 is vertically moved by a link member 42 consisting of the 1st lever 37 and the 2nd lever 40. Further, the reduction body 33 is arranged on the extension of a vertical plane of reduction roll 20. Furthermore, the roll 20 is connected to a driving device through an universal coupling 29.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to equipment for processing taper rods, and more specifically, the present invention relates to processing equipment for taper rods, and more specifically, the present invention relates to processing equipment for tapered rods, and more specifically, for continuous processing of taper rods using a dieless method.
It relates to highly accurate processing equipment that allows for consistent production.

(Prior art) In recent years, in order to improve the ride comfort of automobiles and railway vehicles, tapered coil springs with so-called non-linear characteristics have been developed, which use a taper rod with a variable wire diameter instead of the conventional coil spring with a constant wire diameter. Its popularity is remarkable.

The taper rod used in such tapered coil springs has a large diameter at the center and becomes smaller toward both left and right ends.

As a technique for manufacturing a taper rod having such a shape, a cutting technique is used (Conventional Example 1).

As disclosed in JP-A-58-16728, a plastic working method (conventional example) in which a temperature gradient is applied to a metal iron with a constant wire diameter by an appropriate means, and the difference in the degree of plasticity based on this temperature gradient is utilized. 2).

Plasticity and processing VoL, 20. N[L 224 (19
799), the wire is gripped between a pair of rollers and a winding drum, and the intermediate portion thereof is heated to make the circumferential speed of the drum higher than the circumferential speed of the roller. A continuous dieless drawing device (conventional example 3) that cools the wire while performing compositional processing on the wire.

And so on.

(Problems to be Solved by the Invention) The conventional example 1 described above is formed by machining a metal rod such as a wire or bar having a predetermined wire diameter into a desired tapered shape. There is a large loss of material, and since the tensile strength of such spring wire rods in the rolled state is extremely high, the life of the cutting tool is extremely short, which also increases costs.

As a countermeasure to these problems, softening and annealing the material may be considered, but the addition of such a step would significantly increase costs.

Furthermore, although Conventional Example 2 can solve the problems of Conventional Example 1, the method of Conventional Example 2 requires a step of applying a temperature gradient to the material while the material is stopped, and a step of applying a temperature gradient to the material while the material is stopped. It is necessary to go through the process of applying composition processing by tensioning etc. and the process of discharging the processed material in order, resulting in so-called batch processing in which the flow of the material is temporarily interrupted, resulting in poor efficiency and damage to the material. It is extremely difficult to control the temperature gradient in the process, which is disadvantageous to the method of manufacturing metal irons with high dimensional accuracy.

Furthermore, in Conventional Example 3, since the ratio of the circumferential speeds of the roller and the drum is constant, the diameter of the drawn wire is always constant, which makes it unsuitable for processing taper rods, and also makes it difficult to wind up the wire. Since the wire is wound around the drum and pulled out, there is no slippage between the wire and the winding drum, but on the other hand, the wire wound around the winding drum tends to bend, unnecessarily complicating the subsequent process.

In addition, hardened high carbon steel wire rods, such as those used in springs, do not have toughness and will break when wound around a drum, making it impossible to wind them in their hardened state.
It is not possible to directly manufacture taper rods cut to a certain length using a drawing device, and the device is unsuitable as a taper rod manufacturing device.

Therefore, the present applicant has proposed a pair of fixed-size feed rollers that grip a metal material and send it out at a constant speed, a heating device installed downstream of the fixed-size feed rollers in the feeding direction of the metal material, a cooling device provided further downstream; and a pair or more variable speed tension rollers provided further downstream from the cooling device, gripping the metal material and feeding the metal material at a speed higher than the feeding speed of the fixed size feed roller. and a speed control device that controls the speed of the variable speed tension roller.
(Patent Application No. 167040/1982).

In this proposed technique, although the variable speed tension roller imparts a predetermined reduction edge to the metal material to prevent slipping, slipping is likely to occur for the following reasons.

That is, in consideration of ease of replacement and maintenance, the roller is supported in a cantilever manner with respect to the machine frame, and the rolling blade is adapted to act on a bearing portion supporting the roller.

Therefore, when the wire diameter becomes thinner, the bearing part tilts, causing insufficient rolling force and causing slipping.
There was also a risk that the accuracy of shape and dimensions could not be obtained.

The main purpose of the present invention is to eliminate the drawbacks of the prior art examples 1 to 3 described above, and to prevent slipping, which is the only drawback of the proposed technology.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned objects are characterized by a constant-speed feed roller device including one or more pairs that grips a metal material and sends it out at a constant speed. a heating device provided downstream of the roller device in the feeding direction of the metal material; a cooling device provided further downstream of the heating device;
a pair or more variable speed tension roller devices disposed further downstream from the cooling device for gripping the metal material and feeding the metal material at a speed higher than the feed speed of the constant speed feed roller device; and a variable speed tension roller device for changing the speed of the variable speed tension roller device. and a speed control device for controlling the speed, and the variable speed tension roller device has a rolling roller and a receiving roller that are each cantilever-supported on the machine frame via bearings, and the rolling roller has a bearing on the machine frame. The roller is fixedly movable in the axial direction of the roller and slidable in a direction orthogonal to the axial direction of the roller, and further,
A telescopic processing device consisting of a pressure driving body and a rolling body is mounted on the machine frame, and the rolling body of the pressure applying device is arranged on a vertical extension of the rolling roller, and the rolling body and the rolling body The present invention is characterized in that it is provided with a link member that interlocks and connects the bearings, and is provided with a universal joint shaft that drives the reduction roller in the feeding direction.

(Function) The metal material sent out at a constant speed by the fixed size feed roller device is heated while passing through the heating device, and reaches the highest temperature at the exit portion thereof. This temperature can be controlled, for example, to a high temperature of 900° C. to 1000° C. or lower or higher, as required, at which point the tensile strength of the metal material decreases significantly and the variable speed tension roller device 18 If the feed rate (2) is faster than the feed rate (1) by the constant speed feed roller device 2, plastic deformation of the material occurs at the portion where the temperature reaches the highest, and its cross-sectional area decreases.

The metal material 1 whose cross-sectional area has been reduced in this way is subsequently cooled by passing through the cooling device 11 and its tensile strength increases, so that the cross-sectional area suddenly stops changing and its outer diameter is fixed.

Now, as shown in Figure 6(a), if the feed speed ■1 is 10 m
/min, and when the pull-out speed (2) of the tension roller device 18 is also 10 m/min, the outer diameter of the 12φ metal material l remains constant without changing, and the heating area within the heater 8 and the cooling area between the heater 8 and the A constant 12
φMaintain a constant diameter.

- As shown in Figure 6 (bl), constant speed feed roller device 2
While keeping the feed speed V1 = 10 m/min at one point,
The withdrawal speed v2 of the tension roller device 18 is set to approximately 11.9.
m, the outer diameter of the metal material 1 after being cooled in the cooling zone within the cooling device is reduced to approximately 11φ (area reduction rate of 6%). This is due to the fact that the volume of the metal material 1 passing per unit time is kept constant no matter where on the metal material 1 it is taken.For example, as shown in FIG. The cross-sectional area of the metal material 1 at the part gripped by A1
If A2 is the cross-sectional area of the metal material 1 in a state where the plastic deformation is eliminated by cooling after being heated and subjected to plastic working, then the running speed of the metal material 1 at the portion where the cross-sectional area is A2 is determined by the variable speed tension roller device 18. AI X■1 =
A2 XV2 holds true, and the cross-sectional area A2 is the cross-sectional area A1 and ■
This is because it is calculated as the product of 1/V2, and ■1 and ■2
This is because the larger the speed ratio, the lower the area reduction rate, and the material becomes thinner and drawn out. Therefore, for example, Figure 6 (
As shown in C1, feed speed ■1 is constant (10 m/m1
n), the withdrawal speed of the tension roller device 18 ■
2 is set to 14.4 m, the material that was 12φ on the supply side is narrowed down to 10φ in the cooling area (area reduction rate of 30
．． 5%).

What is shown in FIG. 6 above is a case where the withdrawal speed V2 of the variable speed tension roller device 18 is changed in stages while the feed speed 1 of the constant speed feed roller device 2 is kept constant. However, from this explanation, if the withdrawal speed (2) of the variable speed tension roller device 18 is continuously changed, the cross-sectional area of the material after cooling will also change continuously, and the tapered rond It is understood that it is possible to manufacture

FIG. 7 shows changes in the drawing speed of the tension roller device 18 corresponding to the tapered shape when manufacturing such a tapered rod.
has an outer diameter of 12φ, has a small diameter portion Rc (length Lo) of 10φ in the center of both diameter portions, and has a small diameter portion Rc (length Lo) of the above large diameter portion Ra and RC.
Each part of the tapered rod, which is formed by tapered parts Rd and Re (each having a length L) with a uniform gap between the small diameter part Rc and the small diameter part Rc, passes through the cooling point of the cooling device 9 (the point at which plastic deformation stops due to cooling). This shows the change in the pull-out speed (2) of the tension roller device 18 when the tension roller device 18 is moved, and shows the case where the feed speed v1 of the constant speed feed roller device 2 is 1Qm/min.

Here, as is clear from the above description, the large diameter portion Ra.

When Rh and the small diameter portion Rc pass through the cooling point, the withdrawal speed v2 is set to tom and 14.4 m (constant),
When the tapered portions Rd and Re between them pass through the cooling point, the withdrawal speed v2 gradually increases or decreases.

The degree of this gradual increase or decrease changes almost quadratically since the withdrawal speed (2) is inversely proportional to the area reduction rate (inversely proportional to the square of the diameter of the material before and after plastic deformation).

Where to find the cooling start point as described above, or in other words, how far to secure the deformation area, depends on the characteristics of the material, the type of heating device used, the outer diameter of the material, the maximum temperature reached, etc. Although various responses can be considered, in principle, this can be explained using the graph shown in FIG.

In other words, Figure 8 shows the relationship between the temperature and tensile strength of the material at each location in the heating zone, deformation zone, and cooling zone of the moving material, where the solid line indicates the temperature and tensile strength at the surface of the material, and the broken line indicates the temperature and tensile strength of the material. temperature and tensile strength at the center of
The one-dot chain line indicates the average tensile strength of both, and since heating by the heating device 8 starts from the surface, there is a delay between the change in surface temperature and the change in temperature at the center as shown in the figure. After the surface temperature passes the maximum temperature and enters the deformation region, it gradually decreases, while the center temperature gradually increases even in the deformation region, and cooling starts when the two temperatures match. , it is desirable that the material be uniformly hardened.

By selecting the point at which the quenching starts at the point where the surface and center temperatures match as described above, the point at which the tensile strength of the material becomes uniform, that is, the point at which the most uniform plastic deformation can be obtained, is selected and the plastic deformation is performed. By performing the processing, it becomes possible to maintain the cross-sectional shape of the material after deformation in a perfect circle.

In addition, in this method, the degree of taper of the material can be controlled only by controlling the withdrawal speed of the variable speed tension roller device 18, so the outer diameter and degree of taper of the material can be maintained with extremely high precision. By appropriately changing the speed (2), any cross-sectional change can be generated in the material, and the feeding, ejection, and heating of the material can be achieved under completely continuous conditions, so production efficiency can be maximized. In addition, since it does not rely on mechanical cutting, the material yield and tool yield are both incomparably lower than conventional taper rod manufacturing methods. l? Here, the variable speed tension roller device 18 is for feeding or pulling the metal material l, and for this purpose, as shown in FIGS. 2 to 5, a rolling down roller is used. 20 and a receiving roller 21, and for the pressing roller 20, a pressing body 33 of a telescopic pressing device 22 and a link member 4 are provided.
A rolling blade is provided via 2.

At this time, since the diameter of the metal material 1 changes, the center distance between the rolling roller 20 and the receiving roller 21 needs to change freely. It is also necessary to keep the pressing force (reducing blade) as constant as possible to prevent slipping.

Therefore, the bearing 23 of the roll-down roller 20 is configured to be able to slide freely on the machine frame 25 in a direction perpendicular to the axial direction of the roller, and the transmission shaft that drives the roll-down roller 20 is connected to a universal joint shaft 2.
9, and moreover, the part receiving the load point F and the reaction force point F1, that is, the rolling body 33 of the pressing device 22, is the rolling roller 20.
This means that it is placed on the vertical extension of .

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

The tapered rod processing device according to the present invention can be applied to processing wire rods, bars, and any other metal material with a circular cross section. This is an example of a device for manufacturing.

In FIG. 1, reference numeral 1 denotes a metal material, which is held by one or more pairs of constant-speed feed roller devices 2 and fed in three directions indicated by arrows at a constant feed speed.

The constant speed feed roller device 2 includes a pressure roller 4 and a receiving roller 5, and the pressure roller 4 is pressed by a pressure device 6 to ensure gripping force.

Although two pairs of the constant speed feed roller device 2 are shown in the figure, it may be one pair or three pairs, and when there are two or more pairs, for example, by changing the phase by an appropriate angle and using a plurality of pairs,
It is also possible to increase its gripping force, and the metal material 1
In order to increase the gripping force against the metal material 1, it is preferable to use rollers 4 and 5 whose outer circumferential surfaces are provided with arcuate grooves having a radius equal to the outer circumferential arc of the circular cross section of the metal material 1.

In addition to the hydraulic telescopic cylinder, the pressurizing device 6 includes a spring material,
It can also be replaced with a screwdriver or the like.

The metal material 1 sent out by the constant speed feed roller device 2 is then passed through a measuring meter 7 that detects the feed speed of the metal material 1, which is provided downstream of the constant speed feed roller device 2 in the material feeding direction. guided into the heating device 8.

The heating value W8 shown in the figure is a high-frequency heating device consisting of a work coil 9 and a high-frequency oscillator 10 that excites the work coil 9, but such a heating device is not limited to the above-mentioned high-frequency heating device; A heating device or other non-contact heating device can be used. However, in this invention, since the metal material 1 is heated while being continuously moved,
An energized contact heating device such as that described in Publication No. 7) is inappropriate.

As shown in the figure, the metal material 1 that has passed through the work coil 9 of the heating device 8 is drawn into the cooling device 11 provided further downstream of the heating device 8.

This cooling device 11 uses oil or water as a refrigerant, and includes a quenching tank 11A at the front stage and a refrigerant recovery section 11 at the rear stage.
It is composed of B.

The quenching tank 11A has a nozzle 12 that sprays cooling oil etc. in the direction of the metal material 1, and a refrigerant recovery unit 11 that collects the sprayed refrigerant.
It is generally constituted by a generally cylindrical reflux part 13 that recirculates the refrigerant toward B, and a temporary storage part 14 that temporarily stores the refrigerant to be sent to the nozzle 12.
The blown out refrigerant all flows out in the direction of the reflux part 13,
The refrigerant is oriented in a slightly inclined state toward the refrigerant recovery section on the downstream side so as not to flow out toward the heating device 8 .

The metal material 1 leaving the heating device 8 passes through the center of the nozzle 12, further passes through the reflux section 13, and passes through the refrigerant recovery section 11B.

The refrigerant recovery section 11B is for temporarily storing the refrigerant flowing out from the reflux section 13 in the bottom section 15 and recovering the refrigerant adhering to the metal material 1 that has passed through the reflux section 13 by separating it from the metal material 1. The metal material 1 is in this refrigerant recovery section 1
By coming into contact with a collar 16 made of synthetic rubber or the like provided inside the collar 1B, the refrigerant adhering to the surface of the collar 16 is mechanically scraped off, collected into the bottom 15, and further downstream of the collar 16. By passing through the air wiper 17 consisting of a provided air nozzle, etc., a small amount of refrigerant adhering to the surface is blown away by the compressed air and wiped away from the bottom 15.
will be collected.

The running speed of the metal material 1 that has passed through the cooling device 11 is detected by a measuring meter 78 similar to the measuring meter 7, and a pair or more variable speed tension rollers provided downstream of the cooling device 11. It is gripped by the device 18 and sent out in the feeding direction shown by the arrow 3.

The speed of the variable speed tension roller device 18 is controlled by a DC motor 19, and the speed is controlled according to the degree of taper formed on the metal material 1 to be sent out, and its circumferential speed 2 is higher than the circumferential speed v1 of the constant speed feed roller device 2. controlled at a speed of

The variable speed tension roller device 18 grips and forcibly sends out the metal material 1, which is a tapered rod with a fixed outer diameter, when it passes through the cooling device 11. Since the distance between the centers of the rollers 21 needs to be changed according to the outer diameter of the metal material 1 passing through, the reduction roller 20 is made slidable in a direction perpendicular to the roller axis, and the pressure device 22 presses the metal material 1. It is urged in the direction of the metal material 1, while the receiving roller 21 is fixed so that the center of the metal material 1 always passes through a fixed position.

Referring to FIGS. 2 to 5, variable speed tension roller device 1
8 will be explained in detail.

The rolling down roller 20 has a bearing 23, and the receiving roller 21 has a bearing 2.
4 are cantilever-supported by the machine frame 25, and in this embodiment are arranged on the upper and lower vertical planes including the pass line of the metal material 1. This arrangement may be on the left or right as long as it is on a vertical plane, or when there are two or more pairs, it may be arranged vertically and horizontally alternately.

The bearing 24 of the receiving roller 21 has its bearing box 24A mounted on the machine frame 2.
5, and the motor 1 is attached to the roller shaft 218.
It is connected via a transmission shaft 27 to a reduction gear 26 which is interlocked with the transmission gear 9.

The bearing 23 of the rolling down roller 20 has a bearing box 23A mounted on the machine frame 2.
The roller shaft 20^ is fitted in a slide groove 28 formed in the vertical direction in the roller shaft 20^ so as to be slidably fitted in the slide groove 28 formed vertically in the roller shaft 20, and is fixed in the axial direction. 29A is a pair of flexible parts.

Note that both the transmission shaft 27 and the universal joint shaft 29 are connected to the reducer 2.
6 output shafts 26A and 26B via couplings 30 and 31.

The pressurizing device 22 consists of a pressurizing drive body 32 and a rolling body 33. In this example, the pressurizing drive body 32 is a telescopic cylinder, and the rolling body 3
3 is a piston, the pressure driving body 32 is pivotally connected via a pin 35 to a bracket 34 attached to the upper part of the machine frame 25, and the rolling body 33 is aligned with the center of the rolling roller 20 in the roller width direction, and It is arranged above the roller 20.

That is, the rolling body 33 is located on the vertical extension of the rolling roller 20, and the load point F and the reaction force point F1 are arranged in the same vertical plane.

Further, one end of a lever 37 is connected to the end of the rolling body 33 via a pin 36, and the other end of the lever 37 is connected via an eccentric pin 39 to a bracket 38 fixed to the machine frame 25. A second one connected at one end to the eccentric bin 39
The other end of the lever 40 is connected to the boss portion 23B of the bearing box 23A via a pin 41, where the first lever 37 and the second lever 40 constitute a link member 42.

Here, the rolled body 33 and the bearing box 23A are connected to the link member 42.
By connecting them, a boosting mechanism is constructed based on the link ratio, and even when the pressing force of the pressure driving body 32 is small, a predetermined rolling blade can be applied to the rolling roller 20.

Moreover, since the load point F and the reaction force point Fl mentioned above are on the same plane, the bearing box 23A can be slid smoothly and accurately along the slide groove 28 without tilting, and as a result,
The so-called gap phenomenon between the rolling down roller 20 and the receiving roller 21 is suppressed, and the gripping force of the metal material 1 due to the 100 rollers → 20.21 does not fluctuate easily, contributing to slip prevention.

That is, when the load point F and the reaction force point F1 are different, it means that the bending moment is different, and the bearing box 23
Although there is a possibility that the bearing box 23A may be tilted, since the load point F and the reaction force point F1 are the same as described above, the bearing box 23A is prevented from tilting.

In the illustrated example, the speed change tension roller device 18 has two
Although a pair is provided, this may be a pair of rolling down roller and a receiving roller, and when two or more pairs are provided, any pair may be arranged above and below, but for example, they may be arranged alternately above, below, left and right. good.

Further, the pressurizing drive body 32 may be of a screw type or the like other than a cylinder type, and in short, it may be of a telescopic type.

In this way, the outer diameter of the metal material 1 sent out by the variable speed tension roller device 18 is sent to the downstream side via the wire diameter measuring device 43 provided further downstream than the variable speed tension roller device 18. This wire diameter measuring device 43 (shape measuring device) may be of the type that sandwiches the metal material 1 between two rollers as shown in FIG. 1 and detects the distance between the axes of both rollers. Various contact or non-contact sensors are used, such as those that detect the wire diameter using sensors, and the detection position (installation position) may be between the cooling device 11 and the heating device 8. .

The metal material that has passed through the wire diameter measuring device 43 is sent to a tempering furnace 44 as necessary, and is cut at a predetermined position after undergoing tempering treatment, or is cut immediately after passing through the wire diameter measuring device 43. After that, a tempering treatment is performed.

The feed rate of the metal material 1 before entering the heating device 8 and after leaving the cooling device 11 is measured by the measuring meters 7 and 7A, converted into an electrical signal, and sent to the speed control device 45. This speed control device 44 should give a predetermined taper angle to the metal material 1 (signal from the measuring meter 7.7A←
In addition to controlling the feed speed of the variable speed tension roller device 18 accordingly, a signal from the wire diameter measuring device 43 that detects the outer diameter of the manufactured taper rod is input, and if the value is abnormal, the processing device It is in charge of controlling the operating state of the entire processing apparatus, such as sending an exclusion signal to a cutter, marking device, etc. in the subsequent process, in order to stop the entire processing apparatus or to remove the abnormal rod.

Further, a radiation type thermometer 46 is provided at the outlet of the heating device 8 to measure the temperature of the metal material immediately after exiting the heating device 8, and a temperature control device connected to this thermometer 46 is provided. 47 controls the high frequency oscillator 10 so that the output from the thermometer 46 is constant (that is, so that the temperature of the metal material immediately after coming out of the heating device 8 is constant), and the work coil 9 controls the metal material 1. control the amount of heat given to

Next, a control device for a Taber rod processing device according to the present invention will be explained with reference to the block diagrams shown in FIGS. 9 and 10.

Here, FIG. 9 is a block diagram of the entire control circuit of the taper loft processing apparatus according to the present invention, and FIG. 10 is a block diagram for explaining the signal flow of the arithmetic unit part that can be used in the control circuit. .

Note that the same reference numerals are used for elements common to those shown in FIG. 1. - In this case, the wire diameter measuring device 43 is provided between the heating device 8 and the cooling device 11, and measures the outer diameter of the metal material 1 based on the cooling point. The speed control device 45 shown in FIG. 1 includes the microcomputer A shown in FIG. 9 and a speed pattern measuring section, which will be described later, driven by the microcomputer A.

The microcomputer A is internally comprised of a well-known central processing unit CPU, a read-only memory ROM with built-in programs, a temporary storage RAM, an input/output interface circuit, etc. The output interface circuit connected to the CPU generates a reference speed. 48, a coefficient setter 49, a time function generator 50, and switching devices 51 and 52 are connected to each other.

Further, the temperature signal from the temperature detector 46 is fed back to the temperature control device 47 and is also transmitted to the microcomputer A via the converter B. The temperature control device 47 is connected to a power supply device 53 for controlling the input current to the heating device 8, etc. The temperature control device 47 is connected to the output interface circuit of the microcomputer A, so that the temperature control device 47 is connected to the output interface circuit of the microcomputer A. The temperature of the heating device 8 is appropriately controlled by the temperature setting value sent from A.

For example, depending on the speed signals from the speed detection devices 7 and 7A, the heating (coupling) of the heating device may be adjusted to adjust the degree of plasticity of the metal material to obtain the furthest tension condition, or the feed speed of the variable speed tension roller device (described later) may be adjusted. It is possible to perform control such as adjusting the degree of taper of the metal main material to a predetermined value by adjusting.

Further, as described above, the outer diameter of the metal material is detected by the outer diameter measuring device 43, and this value is input to the microcomputer A, so that the microcomputer A measures the outer diameter of the metal material as described below according to the change. By changing the speed increase of the tension roller device 18, it is possible to arbitrarily adjust the outer diameter and taper degree of the metal material as a product.

Further, the output side of the reference speed generator 48 is connected to a first DC power supply device 54 via a first automatic speed regulator ASR and a first automatic current regulator ACR. The output end is connected to the DC motor DCM-1 that drives the constant speed feed roller device 2.
-1 rotation speed is the first pulse generator PLO-1
is detected and fed back to the input side of the first automatic speed regulator ASR via the first F/V converter 55.

Further, the output signal of the reference speed generator 48 is sent to an adder/subtractor 56.
is added to a signal from a multiplier 57 or the switching device 52, which will be described later, and is transmitted to a second DC power supply device 58 via a second automatic speed regulator ASR2 and a second automatic current regulator ACR-2. and this second DC power supply device 58
The output signal is applied to the DC motor DCM-2 which drives the speed change tension=+7 -ra device 18. DC motor DC
The rotation speed of M-2 is determined by the second pulse generator PLG-2.
is detected and fed back to the adder/subtractor 56 via the second F/V converter 59.

As is clear from the above explanation, the reference speed generator 40 is for generating a reference setting value C for rotating the DC motor DCM-] which drives the constant speed feed roller device 2 at a constant speed, and The setting device 49 is for setting a coefficient α that determines the rate of speed increase of the variable speed tension roller device 18 with respect to the constant speed feed roller device 2, and the output signal from the coefficient setting device 49 is inputted to multipliers 60 and 61. .

On the other hand, the time function generator 50 generates a time function t, and its output signal t is input to the multiplier 60 and simultaneously input to the multiplier 62, where tl+ is calculated, and this tl+ signal is multiplied. By inputting the signal to the multiplier 61, the output signal of the multiplier 61 becomes αtl+, and the multiplier 60
The output signal from is αE11.

In this invention, the temperature control device 47, the reference speed generator 48, the coefficient setting device 49, and the time function generator 50 are driven by the microcomputer A, so that the degree of heating by the heating device 8 and the constant speed feed roller device 2 and The feed speed of the variable speed tension roller device 18 can be set according to a program stored in the ROM of the microcomputer A to obtain a desired taper shape, but each numerical value is also manually given from a keyboard or the like. It is desirable to configure the system in such a way that this is also possible. The setting device in FIG. 9 represents a keyboard or the like having a function for manually setting numerical values, and the temperature control device 47 has a manual setting device 47^, the reference speed generator 48 has a manual setting device 48A, and a coefficient setting device. A manual setting device 49A is connected to the device 49, and a manual setting device 50A is connected to the time function generator 50.

The inner time function generator 50 is connected to an acceleration/deceleration command device 63 for giving a command for accelerating or decelerating the feed speed of the variable speed tension roller device 18 relative to the feed speed of the constant speed feed roller device 2. ing.

Therefore, the microcomputer A inputs the temperature information from the temperature detector 46, the outer diameter information from the outer diameter detector 43, and the speed information from the speed detectors 7 and 7A, and outputs appropriate command information from these information to the reference speed. It is sent to the generator 48, the temperature control device 47, the switching device 51, 52, the coefficient setting device 49, and the time function generator 50, and adjusts the rate of increase in speed of the variable speed tension roller device 18 to set the degree of taper of the metal iron to a predetermined value. Adjust to.

Such adjustment can be performed automatically by the microcomputer A, but it can also be performed manually by a manual setting device.

For example, when a reference speed command signal is given to the reference speed generator 48 from the microcomputer A or the manual setting device 48A, the reference speed generator 4B sends the reference set value signal C to the first automatic speed regulator ASR-1 and the first automatic speed regulator ASR-1. 1 automatic current regulator A
Through CR-1, it is sent to the first DC power supply device 54,
By this DC power supply device 54, the DC motor DCM-1
is rotated at a predetermined reference speed, and the constant speed feed roller device 2 feeds the metal material 1 at a desired constant speed through the heating device 8 and the cooling device 11 toward the variable speed tension roller device 18.

For example, when the microcomputer A is not driving the coefficient setter 49, the signals generated from the switchers 51 and 52 are at 0 level, so the multiplier 57 or the switcher 52
The signal transmitted to the adder/subtractor 56 is at 0 level,
The reference set value C sent from the reference speed generator 48 is passed through the adder/subtractor 56 as it is to the second automatic speed regulator ASR-
2, and is further transmitted to the second DC power supply device 58 via the second automatic current regulator ACR-2.

Therefore, in this case, the DC motor DCM-2 is also
Since the metal material 1 is rotated at the same speed as M-1, and the feed speed of the variable speed tension roller device 18 and the feed speed of the constant speed feed roller device 2 are the same, the metal material 1 is not subjected to plastic processing and does not undergo external deformation before or after heating and cooling. It will be sent out with a constant diameter.

Next, a coefficient command signal is sent from the microcomputer A or the manual setting device 49A to the coefficient setting device 49, and the coefficient setting device 49 sends a desired coefficient setting value signal α to the multipliers 60, 61. Manual setting device 50
The time function generator 50 is activated by the command signal given from A.
Consider the situation where t is sending a time function t to multipliers 60, 61 and 62.

Here, for example, the microcomputer A drives the switch 51, connects the output side of the multiplier 60 and the input side of the multiplier 57, cuts off the output side of the multiplier 61 and the input side of the multiplier 57, and connects the output side of the multiplier 60 and the input side of the multiplier 57. When the switch 52 is set to the op state by the signal from A, the time function signal t from the time function generator 50 and the coefficient value signal α from the coefficient setter 49 are multiplied by the multiplier 60 and become a signal αt. It is transmitted to the multiplier 57 via the switch 51, where the reference setting value C
and the above αt are multiplied together, and the speed command signal Cαt is transmitted to the adder/subtractor 56.

The reference setting value signal C from the reference speed generator 48 is transmitted to the adder/subtractor 56, which is added to the speed command signal Cαt, and the speed command signal C+Cαt is sent to the second automatic speed regulator ASR-2 and the second automatic speed regulator ASR-2. 2 automatic current regulator ACR-2
is transmitted to the second DC power supply device 58 via C, which causes the variable speed tension roller device 18 to
The speed is increased by α to reduce the outer diameter of the metal material after heating and cooling compared to the outer diameter of the metal material before heating.

In this case, by switching the switch 51, the multiplier 61 and the multiplier 5
7, the speed command signal transmitted to the adder/subtractor 56 becomes Cαtl+, and the shape pattern of the tapered portion changes. Similarly, the switch 51 is shut off and the switch 51 is turned off by the switching signal from the microcomputer A.
2 to connect the multiplier 60 and the adder/subtractor 56, the output αt from the multiplier 60 is transmitted to the adder/subtractor 56 via the switch 52, and the variable speed tension roller device 1
8 is driven at a feed rate of C+αt. Also, the switch 52 is switched by a signal from the microcomputer A,
When the multiplier 61 and the adder/subtractor 56 are connected, the output αtl+ from the multiplier 61 is transmitted to the adder/subtractor 56, and the variable speed tension roller device 18 is driven by C+αt11.

By operating the switching devices 51 and 57 as described above, it is possible to vary the feed speed of the variable speed tension roller device 18 while keeping the speed of the constant speed feed roller device 2 constant. The degree of taper of the metal material can be controlled in various ways based on the speed pattern.

For example, when the degree of acceleration (or deceleration) is α or Cctt, the cross-sectional shape of the tapered portion becomes a quadratic curve, although the degree varies depending on the values of C and α, and when it is αtl+ or Cαt11, it becomes a straight line.

In this way, by driving the variable speed tension roller based on various patterns, it is possible to keep the degree of taper of the metal material constant or adjust it arbitrarily.

Note that the first and second pulse generators PLO-1 and PLO-1
The signals from LO-2 are fed back to the input sides of the first and second automatic speed regulators ASR-1 and ASR-2, respectively, so that the first and second DC motors DC
Rapid speed fluctuations of M-1 and DCM-2 are prevented.

(Effects of the Invention) As described above, the present invention includes a pair or more of constant-speed feed roller devices that grip a metal iron and feed it at a constant speed, and a pair of constant-speed feed roller devices that are provided downstream of the constant-speed feed roller device in the material feeding direction. a heating device, a cooling device provided further downstream from the heating device, and a cooling device provided further downstream from the cooling device, which grips the material and feeds the material at a speed higher than the feed speed of the constant speed feed roller device. Since it has one or more variable-speed tension roller devices for feeding out and a speed control device that controls the speed of the variable-speed tension roller device, the taper rods are connected continuously, and it is not a batch-type manufacturing device like the conventional one, so it is extremely easy to use. Since the efficiency is high and the degree of taper can be strictly controlled, a tapered rod with good dimensional accuracy can be manufactured.

In addition, the variable speed tension roller device consists of a reduction roller and a receiving roller, and is able to slide freely on the bearing frame of the reduction roller in a direction perpendicular to the axial direction of the roller. A predetermined rolling edge can also be applied to the rolling roller, and since rotational force is transmitted to the rolling roller via a universal joint shaft, even if the rolling roller slides, accurate rotational force can be maintained. can be transmitted.

Furthermore, when applying pressure (rolling blade) to the rolling roller, the rolling body of the pressure device is on the vertical extension of the rolling roller, so the load point and reaction force point for rolling coincide. Therefore, there is little inclination of the bearing supporting the roll-down roller, so there is little risk of slipping even when the diameter changes.1. A predetermined tension and feed can be expected, and a tapered rod with a uniform shape can be manufactured.

In addition, since the rolling body and the bearing of the rolling roller are interlocked and connected by a link member, the capacity of the pressing drive body can be kept to the minimum necessary, which also makes the equipment more compact. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a block diagram of the entire processing equipment, Fig. 2 is a front view of the variable speed tension roller device, Fig. 3 is a diagram indicated by the arrows 3-3 in Fig. 2, and Fig. Figure 4 is Figure 2 4-
4 line arrow diagram, Figure 5 is Figure 2 5-5 line arrow diagram, Figure 6 a
, b, and c are graphs showing the relationship between the pulling speed and the diameter of the manufactured opening and diameter for detailed explanation of the present invention, and FIG. 7 shows the temporal change in the pulling speed for forming a tapered rod. Graph, FIG. 8 is a graph showing the relationship between temperature and tensile strength with respect to the axial distance of the rod being manufactured, FIG. 9 is a block diagram schematically showing the control circuit of the processing device according to the above embodiment, and FIG. 10 is a block diagram showing the flow of signals within a microcomputer that can be used in the same control circuit. 1-metal material, 2-constant speed feed roller device, 8--heating device, 11-cooling device, 18--tension roller device, 20--pressing roller, 21--receiving roller, 22
=-pressure device, 23.24-bearing, 25-machine frame, 29-
Universal joint shaft, 32-pressure drive body, 33-rolling body, 42-
link member.

Claims (1)

[Claims] 1. A pair or more of constant-speed feed roller devices that grip the metal material and send it out at a constant speed, a heating device provided downstream from the roller device in the feeding direction of the metal material, and a heating device provided further downstream from the heating device. a cooling device provided further downstream from the cooling device, a pair or more variable speed tension roller devices that grip the metal material and feed the metal material at a speed higher than the feed speed of the constant speed feed roller device; and a speed control device for controlling the speed of a variable speed tension roller device, and the variable speed tension roller device has a rolling roller and a receiving roller, each of which is cantilever-supported on a machine frame via a bearing, The bearing of the reduction roller is mounted on the machine frame so as to be immovable in the axial direction of the roller and slidable in a direction perpendicular to the roller axis.Furthermore, a telescopic processing device consisting of a pressure drive body and a reduction body is attached to the machine frame. It is attached to
The rolling body of the pressing device is disposed on a vertical extension of the rolling roller, and includes a link member that interlocks and connects the rolling body and the bearing of the rolling roller, and a universal joint shaft that drives the rolling roller in the feeding direction. Taper rod processing equipment characterized by being equipped with.