Automatic lengthening device for tailstock of numerical control lathe

Abstract

The utility model discloses an automatic extension device for a tailstock of a numerically controlled lathe, which comprises a tool apron connector, two pairs of retractable claws and a tip connecting rod, the tool apron connector is detachably mounted on a tool apron of the numerically controlled lathe, and each pair of retractable claws is pivotally connected to one of two end faces of the tool apron connector. A first tip is arranged at one end of the tip connecting rod, a top hole is formed in the other end of the tip connecting rod, the first tip is configured to be capable of being jacked into an inner hole of a shaft part to be machined, the top hole is configured to be capable of being jacked into a second tip installed on a tailstock of a numerical control lathe, and the inner sides of the two ends of the tip connecting rod are each provided with an annular groove. The heads of each pair of retractable clamping jaws face the corresponding annular groove and are configured to clamp the tip connecting rod, and the tails of each pair of retractable clamping jaws are configured to be retractable or unfolded. The device is low in investment and high in efficiency, the time for manually moving the tailstock due to the fact that the telescopic distance of the tailstock ejector pin is short is shortened, and one-time machining of products is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical production and processing, in particular to an automatic extension device for the tailstock of a numerical control lathe. Background Art

[0002] With the development of the mechanical industry, precision machine tools have been widely used. In particular, the continuous emergence of multi-functional equipment has gradually improved the processing efficiency. However, in existing numerical control lathes, approximately 80% of the tailstocks cannot move automatically. When machining shaft parts, the shaft parts are clamped on the chuck on the main spindle of the lathe, the center on the tailstock retracts, and the boring tool holder clamps a drill bit for drilling. After the drilling is completed, the center on the tailstock is used to press against the inner hole of the shaft part for positioning, and the boring tool holder clamps a tool for machining the outer circle, thread, and outer groove.

[0003] When the tailstock is fixed, the telescopic distance of the center on the tailstock is usually about 80 to 100 millimeters, while the length of the boring tool holder is usually 110 to 130 millimeters. If drilling and outer circle machining are not carried out in sequence, it may cause the boring tool holder to collide with the center, which limits the machining of products. If the center is not used on the tailstock to prevent the boring tool holder from colliding with the center, it is acceptable for small-batch machining, but it will increase the cost for large-batch machining. Especially in the machining of the outer circle, thread, and outer groove of long shaft parts, if the center is not used, stable machining may not be possible.

[0004] Therefore, the technical personnel in this field are committed to developing an automatic extension device for the tailstock of a numerical control lathe to solve the problems existing in the prior art. Summary of the Utility Model

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is how to provide an automatic extension device for the tailstock of a numerical control lathe, so that when machining with the center of the tailstock, the inner hole can also be machined, thereby ensuring the coaxiality of the inner hole and the outer circle of the product, improving the processing efficiency, ensuring stable and efficient large-batch machining, and eliminating the need to replace equipment.

[0006] To achieve the above object, the present utility model provides an automatic extension device for the tailstock of a numerically controlled lathe, which includes a toolholder connector, two pairs of retractable jaws, and a center connecting rod. The toolholder connector is detachably installed on the toolholder of the numerically controlled lathe. Each pair of the retractable jaws is pivotally connected to one of the two end faces of the toolholder connector respectively. One end of the center connecting rod is provided with a first center, and the other end is provided with a center hole. The first center is configured to be able to be inserted into the inner hole of the shaft-like part to be machined, and the center hole is configured to be able to be inserted into by a second center installed on the tailstock of the numerically controlled lathe. An annular groove is respectively provided on the inner sides of both ends of the center connecting rod. The heads of each pair of the retractable jaws are arranged towards the corresponding annular groove and are configured to be able to clamp the center connecting rod. The tails of each pair of the retractable jaws are configured to be able to contract or expand.

[0007] Further, each pair of the retractable jaws is symmetrically arranged about the longitudinal axis of the toolholder connector.

[0008] Further, a mounting hole is vertically opened on the top surface of the toolholder connector, and the toolholder connector is detachably installed on the toolholder of the numerically controlled lathe by bolts passing through the mounting hole.

[0009] Further, the mounting hole is a countersunk hole.

[0010] Further, an arc-shaped groove is opened on the top surface of the toolholder connector along the length direction, and the arc-shaped groove is configured to be able to accommodate the center connecting rod.

[0011] Further, the arc-shaped groove is symmetrically arranged about the longitudinal axis of the toolholder connector.

[0012] Further, each pair of the retractable jaws includes two jaws. The heads of the two jaws are arranged oppositely. The middle of each jaw is pivotally connected to the corresponding end face of the toolholder connector through a pivot shaft, and the tails of the two jaws are connected by an elastic member.

[0013] Further, a fixing pin is respectively provided on the tails of the two jaws relative to each other, and the elastic member is arranged between the fixing pins of the tails of the two jaws in each pair of the retractable jaws.

[0014] Further, the elastic member is a spring.

[0015] Further, the length of the center connecting rod is 110 to 130 mm.

[0016] The beneficial effects of the present utility model are:

[0017] The utility model is particularly applicable to mass-produced products that must use a center and whose tailstock cannot move automatically and require internal hole machining. The utility model has low input and high efficiency, reduces the time required for manual movement of the tailstock due to the short telescopic distance of the tailstock center, ensures one-time machining of products, and avoids the problem of product scrapping caused by sequential machining.

[0018] The concept, specific structure and technical effects of the present utility model will be further described below in conjunction with the accompanying drawings to fully understand the purpose, features and effects of the present utility model. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural view of a workpiece to be machined in a preferred embodiment of the present utility model;

[0020] Figure 2 is a schematic structural view of a preferred embodiment of the present utility model;

[0021] Figure 3 is an exploded view of a preferred embodiment of the present utility model.

[0022] Among them, 1 - tool holder connector, 2 - shrink chuck, 3 - center connecting rod, 4 - first center, 5 - top hole, 6 - annular groove, 7 - mounting hole, 8 - arc-shaped recess, 9 - chuck, 10 - elastic member, 11 - fixing pin. Detailed Description of the Preferred Embodiment

[0023] The preferred embodiments of the present utility model are introduced below with reference to the accompanying drawings of the specification to make its technical content clearer and easier to understand. The present utility model can be embodied in many different forms of embodiments, and the protection scope of the present utility model is not limited to the embodiments mentioned in the text.

[0024] In the accompanying drawings, components with the same structure are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present utility model does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of some components in the drawings is appropriately exaggerated.

[0025] As Figure 1 shown, for the shaft-like part, there is a 4.5 mm internal hole inside it, and the coaxiality requirement between the internal hole and the outer circle is within 0.04. Therefore, it is necessary to machine the internal hole and the outer circle in one process. The head of this product is a thread. If the center is not used, chatter will occur during machining of the small head outer circle and the thread, making it difficult to ensure the dimensions and surface roughness. If the center is used, the existing equipment's tailstock cannot move automatically, and the internal hole cannot be machined.

[0026] As Figure 2 、 Figure 3As shown in the figure, this embodiment provides an automatic extension device for the tailstock of a numerically controlled lathe, including a toolholder connector 1, two pairs of retractable jaws 2, and a center connecting rod 3. The toolholder connector 1 is detachably installed on the toolholder of the numerically controlled lathe. The toolholder connector 1 has a bottom surface and a top surface in the height direction Z of the toolholder connector 1, two end faces at both ends in the length direction X of the toolholder connector 1, and two side faces at both ends in the width direction Y of the toolholder connector 1. Each pair of retractable jaws 2 is pivotally connected to one of the two end faces respectively. One end of the center connecting rod 3 is provided with a first center 4, and the other end is provided with a socket 5. The first center 4 is configured to be able to be inserted into the inner hole of the shaft-like part to be machined, and the socket 5 is configured to be able to be inserted into by the second center installed on the tailstock of the numerically controlled lathe. An annular groove 6 is provided on the inner side of both ends of the center connecting rod 3. The head of each pair of retractable jaws 2 faces the corresponding annular groove 6 and is configured to be able to clamp the center connecting rod 3, and control the center pin connecting rod 3 to move back and forth within a limited range through the annular groove 6.

[0027] The tail of each pair of retractable jaws 2 is configured to be able to contract or expand.

[0028] Preferably, the socket 5 is a 60° tapered hole.

[0029] Preferably, each pair of retractable jaws 2 is symmetrically arranged about the longitudinal axis L of the toolholder connector.

[0030] An installation hole 7 is vertically opened on the top surface of the toolholder connector 1. The toolholder connector 1 can be detachably installed on the toolholder of the numerically controlled lathe by bolts passing through the installation hole 7. Preferably, the installation hole 7 is a countersunk hole, and the bolts can be installed in the countersunk hole.

[0031] An arc-shaped recess 8 is opened on the top surface of the toolholder connector 1 along the length direction X. The arc-shaped recess 8 is configured to be able to accommodate the center connecting rod 3.

[0032] The arc-shaped recess 8 is symmetrically arranged about the longitudinal axis L of the toolholder connector 1.

[0033] Each pair of retractable jaws 2 includes two jaws 9. The heads of the two jaws 9 are arranged oppositely. The middle of each jaw 9 is pivotally connected to the corresponding end face of the toolholder connector 1 through a pivot shaft. The tails of the two jaws 9 are connected by an elastic member 10.

[0034] A fixing pin 11 is respectively provided on the tails of the two jaws 9 relative to each other. An elastic member 10 is provided between the fixing pins 11 at the tails of the two jaws 9 in each pair of retractable jaws 2, which can ensure that the jaws 9 fix the center connecting rod 3 on the toolholder and will not fall off.

[0035] In this embodiment, the elastic member 10 is a spring.

[0036] In this embodiment, the length of the center connection rod 3 is 110 to 130 mm.

[0037] When the center connection rod 3 is abutted between the shaft part to be machined and the tailstock of the CNC lathe, it can be disengaged from the shrink chuck 2.

[0038] The usage method of the automatic extension device for the tailstock of the CNC lathe in this embodiment is as follows:

[0039] 1. Fix the automatic extension device for the tailstock of the CNC lathe on the tool post of the CNC lathe.

[0040] 2. After the center hole of the shaft product part is machined, the automatic extension device for the tailstock of the CNC lathe moves according to the program, the front end is docked with the center hole of the product part, and the tailstock center at the rear moves forward and is automatically docked with the automatic extension device for the tailstock of the CNC lathe.

[0041] 3. The tool rest of the machine tool retracts, the center connection rod disengages from the tool post, and the shaft product part is clamped and fixed by the center connection rod and the tailstock center.

[0042] 4. After machining all the features of the outer circle, move the tool post, fix the center connection rod in the tool post connector, and the tailstock center retracts.

[0043] 5. The tool post retracts, the distance between the end face of the product part and the tailstock center is about 200 mm, and the inner hole of the product part is machined.

[0044] Machining analysis:

[0045] The distance between the tailstock center and the end face of the product part is about 76 mm. Therefore, the length of the traditional boring tool post has exceeded this distance, and drilling and boring operations cannot be carried out. This problem is well solved by the present utility model, and the machining ability of the existing equipment is significantly improved.

[0046] The above embodiments show that the present utility model can effectively solve the limitation that the tailstock of the CNC lathe cannot move freely, and meet the requirement of completing the inner hole and the outer circle in one process, which is of great significance for enterprises to improve the machining efficiency and product quality of such parts.

[0047] The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology shall fall within the protection scope determined by the claims.

Claims

1. An automatic extension device for the tailstock of a CNC lathe, characterized in that: It includes a tool seat connector, two pairs of retractable claws, and a top connecting rod. The tool seat connector can be detachably installed on the tool seat of a CNC lathe. Each pair of retractable claws can be pivotally connected to one of the two end faces of the tool seat connector. A first top is provided at one end of the top connecting rod, and a top hole is provided at the other end. The first top is configured to be able to be pushed into the inner hole of a shaft part to be processed, and the top hole is configured to be able to be pushed into by a second top installed on the tailstock of the CNC lathe. An annular groove is provided on the inner side of each of the two ends of the top connecting rod. The head of each pair of retractable claws is arranged toward the corresponding annular groove and is configured to be able to clamp the top connecting rod. The tail of each pair of retractable claws is configured to be able to retract or expand.

2. The automatic extension device for the tailstock of a CNC lathe according to claim 1, characterized in that: Each pair of the retracted claws is symmetrically arranged about the longitudinal axis of the blade seat connector.

3. The automatic extension device for the tailstock of a CNC lathe according to claim 1, characterized in that: A mounting hole is vertically opened on the top surface of the tool holder connector, and the tool holder connector is detachably mounted on the tool holder of the CNC lathe by means of bolts passing through the mounting hole.

4. The automatic extension device for the tailstock of a CNC lathe according to claim 3, characterized in that: The mounting hole is a countersunk hole.

5. The automatic extension device for the tailstock of a CNC lathe according to claim 1, characterized in that: An arc-shaped groove is provided on the top surface of the tool holder connector along the length direction, and the arc-shaped groove is configured to accommodate the top connecting rod.

6. The automatic extension device for the tailstock of a CNC lathe according to claim 5, characterized in that: The arc grooves are symmetrically arranged about the longitudinal axis of the blade seat connector.

7. The automatic extension device for the tailstock of a CNC lathe according to claim 1, characterized in that: Each pair of the retractable claws includes two claws, the heads of the two claws are arranged opposite to each other, the middle part of each claw can be pivotally connected to the corresponding end surface of the tool holder connector through a pivot shaft, and the tails of the two claws are connected by an elastic member.

8. The automatic extension device for the tailstock of a CNC lathe according to claim 7, characterized in that: The tails of the two clamping jaws are respectively provided with a fixing pin relative to each other, and the elastic member is arranged between the fixing pins of the tails of the two clamping jaws in each pair of contraction clamping jaws.

9. The automatic extension device for the tailstock of a CNC lathe according to claim 7, characterized in that: The elastic member is a spring.

10. The automatic extension device for the tailstock of a CNC lathe according to claim 1, characterized in that: The length of the top connecting rod is 110 to 130 mm.

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