CN2043534U - Automatic screw-turning device - Google Patents

Abstract

The utility model relates to an improved automatic screw-turning device, comprising a transmission mechanism, a longitudinal host machine body with gap adjusting elements and a compensating mechanism for errors, a transverse host machine body provided with an end cam and a tool holder. The utility model is particularly suitable for processing the short screw threads of 50 mm comprising taper screw threads. The utility model has the advantages of high precision, low cost and convenient operation. The automatic screw-turning device can do the turning for an excircle and a chamfering before doing the turning for screw threads.

Description

The utility model relates to an improved automatic thread turning device, which belongs to a machine tool accessory for turning threads on an ordinary lathe.

At present, thread turning on ordinary lathes is mainly manual operation. Generally speaking, the tool retraction time in the thread turning process is very short. Therefore, workers must be highly concentrated when operating, and the labor intensity is high. cause accidents and waste. In recent years, foreign countries have adopted fast threading devices, which overcome the shortcomings of manual threading. However, due to the high precision requirements of the thread itself, and the lengthening of the inline transmission chain due to the addition of the thread turning device, the precision requirements for the thread turning device are higher, the processing technology is complicated, the processing is difficult, special processing equipment is required, and the production cost High; and because the feed of the device belongs to the equal depth cutting thread, the turning high-precision thread is not easy to meet the requirements for this reason; the device has only a kind of quick toolholder again, and cannot car outer garden and chamfering etc.

The purpose of this utility model is to provide a kind of processing technology is comparatively simple, easy to assemble, reliable work, can car outer rounding, chamfering before turning thread, can automatically complete various short threads, including the automatic turning thread device of taper thread.

The purpose of this utility model is accomplished through the following measures:

The power is transmitted from the tail of the screw of the lathe through the transmission mechanism to the worm of the longitudinal main body provided with the adjustment element for eliminating the gap, the worm meshes with the transmission element, and the upper cam of the double-layer cam coaxial with the transmission element drives a The mechanism makes the longitudinal main body connected with the compensation mechanism move longitudinally along the main shaft of the lathe.

The lower cam of the double-layer cam drives another roller, and converts the motion into lateral motion through the needle groove on the push rod, thereby driving the horizontal main body to move horizontally. The horizontal main body is equipped with a control mechanism. At this time, the roller on the ratchet shaft is pushed up by the collision block installed on the lower machine base, and the ratchet shaft moves upward, the ratchet pulls the ratchet to rotate, and the end cam set coaxially with the ratchet also rotates accordingly, thereby changing the movement of each movement. The depth of cut of the knife, and coordinate the movement of the turning tool to advance and retreat when turning the thread. As the number of turnings increases, when the thread processing is about to be completed, the amount of cutting each time decreases, and the total thread turning depth increases. When each turning action is completed, the turning tool quickly and automatically withdraws from the workpiece, and the device completes the turning thread in this way. Working cycle, and finally get qualified products.

In addition to the quick-change tool holder, the device also has a manual three-position rotary tool holder and a fixed tool holder.

For this reason, the thread turning precision of the utility model is high, and is suitable for the short thread, taper thread, trapezoidal, triangular male and British thread with length shorter than 50mm and tooth depth less than 3.5mm, including no empty sipe, brake root thread, especially Suitable for batch processing.

The utility model is described in detail below in conjunction with accompanying drawing embodiment:

Fig. 1 is the working state diagram of automatic turning thread device of the present utility model;

Fig. 2 is a front view of the utility model;

Fig. 3 is the assembly diagram of the worm with the gap adjustment element of the present invention;

Figure 4 is the front view of the eccentric copper sleeve;

Figure 5 is a front view of a roller with an eccentric sleeve;

Fig. 6 is the main and left view of the end face cam;

Figure 7 is a manual three-position rotary tool holder;

Figure 8 is a fixed tool holder.

With reference to accompanying drawing 1 to accompanying drawing 4, the utility model comprises: transmission mechanism, longitudinal main body, transverse main body, lower machine base and knife holder. The transmission mechanism is composed of a short shaft, a gear, an intermediate wheel, a universal joint, a spline shaft, a spline sliding sleeve and a cover.

The longitudinal main body consists of a worm, a bearing, a helical gear, a double-layer cam, an eccentric copper sleeve, an eccentric roller, a longitudinal sliding body, a knife edge, a push rod spring and a fastening screw.

The horizontal main body comprises a roller, a collision block, a pawl, a pawl shaft, an adjustment nut, a ratchet, an end face cam, a shaft, a lateral sliding body, and a sliding block.

The automatic turning thread device of the utility model is installed on the horizontal carriage of the lathe, and the power is transmitted to the worm 1 of the longitudinal main body provided with the adjustment element for eliminating the gap through the screw and the transmission mechanism, for example, the eccentric copper sleeve 2 is used to compensate the worm 1 The meshing error with the pinion gear 3 improves the transmission accuracy, and the upper cam of the double-layer cam 4 coaxial with the pinion gear 3 drives a mechanism with error compensation, such as a roller 7 with an eccentric sleeve, as shown in Figure 5 for Compensate the cumulative pitch error caused by manufacturing and assembly errors, and drive the longitudinal sliding body 10 to move longitudinally along the main shaft of the lathe through the connecting screw 8 connected to the eccentric roller 7, and the movement track of the turning tool on the workpiece is the required helical line .

When one stroke of the longitudinal main body is nearly completed, the lower cam of the double-layer cam 4 drives another roller 5, and the connecting element 6 coupled with the roller 5 drives the push rod 9, and the other end of the push rod 9 has a chute , the slide block 21 on the transverse main body enters the push rod 9 chute to convert the longitudinal movement of the longitudinal sliding body 10 into the transverse movement of the transverse sliding body 19 .

A control mechanism is arranged in the body of the horizontal main body. When the vertical main body returns each time, the bumper 16 installed on the lower frame 20 tops the roller 15, and the ratchet shaft 13 connected with the roller 15 moves upward, and the pawl 11 is pulled out. The ratchet 12 rotates at a certain angle, and the end cam 17 coaxial with the ratchet 12 also rotates at the same angle. For example, the working surface of the end cam 17 is composed of multi-level steps, as shown in Figure 6, which is made by machining and hardened. , to automatically change the cutting depth of each pass. When the end face cam 17 working surface ran into the knife edge 18 on the longitudinal main body, the transverse main body motion just stopped. When the vertical main body returned quickly and automatically, the ratchet 12 turned a position again, and the motion entered the next turning thread working cycle again. When the thread is almost finished, the amount of cutting each time decreases gradually. When the required cutting depth is reached, the turning tool quickly and automatically retreats from the workpiece and returns to the initial position, and the movement of the cutting tool is coordinated and reliable. Changing the design of the cam working surface on the end face can realize equidistant radial infeed, degressive radial infeed and non-feed light thread repair during threading. In this embodiment, the end face cam 17 adopts progressive radial infeed and final no-infeed light trimming. Thus the processed thread quality is good and the efficiency is high.

In embodiment 2, when the taper thread is to be processed, the whole set of thread turning device is moved by a required angle relative to the lathe spindle axis.

When the lathe is not processing threads, it is only necessary to loosen the screws of the lower machine base, disassemble the whole device and replace it with the original tool holder, and the lathe can be restored to its original state quickly, and the operation, assembly and disassembly are convenient.

The utility model is also a "universal combination" automatic module device, which can also be used as a functional component for various combined machine tool threads.

The utility model has also increased manual three-position rotary cutter holder and fixed cutter holder as accompanying drawings 7 and 8 except the quick-change cutter holder.

The utility model has obvious effects and advantages:

The automatic thread turning device is especially suitable for processing short threads of 50 mm including taper threads, without empty slits, root-brake threads, high machining accuracy, and can be rounded and chamfered before turning threads, which reduces costs and is easy to operate, especially suitable for for batch processing.

Claims (4)

1, a kind of by transmission mechanism, the vertical, horizontal main body, the automatic turning screw device that the lower support cutter holder constitutes is characterized in that:

The worm screw of A, vertical main body is provided with the gap and adjusts element, worm screw and actuated element engagement, and double-deck cam driving mechanism of having error compensation coaxial with actuated element, the vertical main body that makes it to be connected with error compensation mechanism travels longitudinally along lathe spindle.

The ratchet shaft of B, horizontal main body is provided with edge cam, in order to change the cutting-in of each feed.

C, described cutter holder increase manual three revolution cutter holders and fixed cutter holder except that the quick change cutter holder.

2,, it is characterized in that it is eccentric copper sheathing that element is adjusted in the gap that is provided with on the worm screw by the described automatic turning screw device of claim 1.

3, by the described automatic turning screw device of claim 1, it is characterized in that error compensation mechanism is the roller that has eccentric bushing.

4, by the described automatic turning screw device of claim 1, it is characterized in that the edge cam working face is made of multistage step.

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