CN201394745Y - Lathe Fixture for Machining Arc Surface in Jaw Body - Google Patents

Abstract

A lathe fixture used for processing the arc surface in the claw body, comprising: a faceplate type clamp body (1), a claw body support (2), and the claw body support adopts a rectangular pin (5) for positioning and a screw thread The connection method is fixed on the faceplate-type clamp body according to three equal parts, the faceplate-type clamp body is directly fixed on the lathe spindle (9), and the three jaw bodies (3) are respectively fixed on the three jaw body supports (2 )Inside. The utility model lathe fixture used for processing the arc surface in the claw body, the special fixture installed with the claw body is used to implement the inner arc cutting process on the ordinary C-620 lathe, replacing the original planer, milling machine, drilling machine, etc. The arc surface processing method effectively solves the problems of inconvenient processing, low efficiency, and uncontrollable quality caused by the lack of special tooling and fixtures in the arc surface processing of the claw body of the high-speed cold rolling pipe machine, and improves the processing and production efficiency. . In addition, the utility model has reasonable design, compact structure, convenient use and maintenance, accurate and firm positioning, safety and reliability, and strong versatility.

Description

Lathe Fixture for Machining Arc Surface in Jaw Body

technical field

The utility model relates to a lathe processing equipment, in particular, the utility model relates to a special tooling fixture for a lathe used for processing a high-speed cold-rolled pipe machine for steel pipe production in metallurgy and machinery industries, and the fixture is particularly It is suitable for processing the circular arc surface in the claw body of the high-speed cold rolling mill for producing seamless steel pipes and other steel pipes.

Background technique

Steel pipes such as seamless steel pipes are common metallurgical metal products. The production process is: tube blank production (steelmaking, steel rolling), steel tube blank (metal round steel), tube blank preparation (length cutting, surface peeling, centering hole drilling) , machining the round steel into a qualified tube blank; barren tube production (the hot-rolled piercer pierces the high-temperature tube blank, and processes the metal tube blank into a hot-rolled barren tube); then, according to the technical requirements of the finished tube, Using the corresponding cold deformation (cold rolling, cold drawing) processing technology, cold deformation processing is carried out according to the specified process requirements, and the waste pipe is produced into finished seamless steel pipes and other steel pipes that meet the specified requirements; finally, the finished seamless steel pipes that pass the inspection Wait for the steel pipe to be cut, printed and packaged.

In the production of steel pipes such as seamless steel pipes, cold deformation processing is the main production process. The cold rolling production has become a widely used cold deformation processing production method due to its advantages of large deformation, easy control, high rolling precision, fast speed, and large output.

At present, cold-rolling mills are used for cold-rolling and deformation processing of steel pipes such as seamless steel pipes. According to the different deformation methods (tools), cold rolling mills are divided into ring-hole and half-hole cold-rolling mills. The ring-hole cold rolling mill is widely used as high-precision seamless steel pipe and other steel pipe rolling production equipment due to its advantages such as long working stroke of the frame, long deformation area, fast rolling speed, and large rolling force.

SKW-75 high-speed cold-rolling mill is cold-rolling equipment for steel pipes such as seamless steel pipes produced by Germany Mannesmann Mill. The equipment is composed of main transmission mechanism, rolling mechanism, feeding mechanism, slewing mechanism, hydraulic mechanism, pneumatic mechanism, lubricating mechanism, feeding and discharging mechanism, cooling mechanism, electrical control system and other parts. It is used for rolling φ19～φ57mm high Precision seamless steel pipe and other steel pipe production. The rotary mechanism of SKW-75 high-speed cold rolling mill is composed of mandrel chuck device, inlet chuck device, outlet chuck device, transmission shaft and other components, which are used to clamp and drive the mandrel and tube billet during the rolling process. , The finished pipe rotates around the same rolling center line according to the technical requirements of feed and rotation angle, so as to ensure that the roundness of seamless steel pipes and other steel pipes meets the quality and precision requirements.

In high-speed cold rolling mills such as SKW-75, the mandrel chuck device clamps and drives the mandrel, the inlet chuck device clamps and drives the tube billet, and the outlet chuck device clamps and drives the finished tube after rolling. . The structure of the inlet chuck device is the same as that of the outlet chuck device, and they are composed of hydraulic cylinders, brackets, shift forks, main shafts, gear boxes, claws, positioning rings and other components. In order to ensure that the tube billet and the finished tube must coincide with the rolling center line and not deviate from the rolling production, and ensure that they can rotate under the force of the clamping force, so the requirements for the claws are relatively high. For steel pipes such as seamless steel pipes with different rolling specifications, the jaws of corresponding specifications should be selected.

On the other hand, according to the purpose, the jaws are divided into two types: inlet jaws (for clamping the tube billet) and outlet jaws (for clamping the finished tube), both of which are made of copper (copper is softer than steel and is not easy to Scratch the outer surface of steel pipes such as seamless steel pipes), and install them on the main shafts of the inlet chuck device and the outlet chuck device respectively. A pair of claws consists of three claw bodies and three slide plates. The slide plates are fixed on the claw body with hexagon socket flat machine screws. The claws are pre-installed and formed for use in groups.

The claw body is a right-angled trapezoid with an inner arc surface (Figure 4). The inner arc surface is the steel pipe clamping surface, and three installation threads are processed on the inclined surface (that is, the mounting surface with the claw body support) The center line of the three-threaded hole is perpendicular to the slope; the angle between the slope and the top surface (left side, that is, facing the side of the clamp body) is usually 105°, and the angle between the slope and the bottom plane (right side, that is, the side of the tool entering the tool) Usually at 75°. In addition, the top surface of the claw body (facing the side of the clamp body) is smoothly connected with the rounded corner of the inner arc surface, and the bottom plane (the side of the tool entering the knife) and the inner arc surface form a certain angle, which is convenient for no Seam steel pipes and other steel pipes enter and play a guiding role. The inner arc surface of the claw body is used to clamp the outer circumferential surface of steel pipes (pipe blanks, finished pipes) such as seamless steel pipes, and corresponding arcs are processed according to different specifications.

In the above occasion, the three claw bodies form a complete circular hole, which contains the outer peripheral surface of steel pipes (pipe blanks, finished pipes) such as seamless steel pipes. After the claw body is used, the inner arc surface will be worn. At this time, usually, the angle (inclination) of the inclined surface can be automatically adjusted and compensated under the action of the hydraulic cylinder. When the amount of wear exceeds the specified range, it will be It must be replaced to ensure that the misalignment between the chuck device and the rolling center line meets the technical requirements.

Since the inner arc surface of the claw body is used for the chuck device to clamp steel pipes such as seamless steel pipes under the premise of ensuring the rolling center line, the processing accuracy is high, and the inner arc is generally processed by machining metal cutting. Surface, that is, planer, milling machine, drilling machine processing; and the current problems in the processing method of the arc surface in the following claw body are:

1) Planer processing: Fix the claw bodies one by one longitudinally on the flat pliers, fix the flat pliers on the working platform, and plan the inner arc surface on the claw body with an arc planer. Due to this method, it is difficult to grind and shape the circular arc planer, and it is necessary to prepare corresponding planers according to different specifications in advance, and the planer needs to be re-grinded after it is worn out, which is labor-consuming and time-consuming. At the same time, the planer processing cannot directly measure the inner arc surface, and can only use the comparison method to measure through sample rods and gauge blocks. As a result, the roundness machining accuracy of the inner arc surface is relatively low; the production efficiency of single-piece processing is low.

2) Milling machine processing, this method is to place the claw body on the working platform in groups, fix the position according to the marking line on the platform in advance, and use a special milling cutter to process vertically from top to bottom. According to this method, the length of the standard milling cutter is less than 100mm, and an extended milling cutter needs to be selected. Therefore, it is necessary to prepare an extended milling cutter of the corresponding size according to different specifications. After the milling cutter is worn, it cannot be ground, so the processing consumption is large and the cost is high; at the same time, due to the group processing, the clamping and positioning requirements for the jaw body are high, labor-intensive and time-consuming, and the production efficiency is low; If it is shifted, it will cause machining deviation on the inner arc surface and be scrapped.

3) Drilling machine processing, according to this method, the claw bodies are placed on the working platform in groups, fixed according to the previously marked position on the platform, and the standard twist drill is used to process vertically from top to bottom. According to different specifications, prepare drill bits of corresponding size. After the drill bit is worn out, it can be used again after being ground by the grinding wheel (it cannot be used until the length of the twist section of the drill bit is less than 105mm), so the processing cost is less. However, similar to milling machine processing, this method has high requirements for clamping and positioning of the jaws because the jaws need to be processed in groups, which is labor-intensive and time-consuming, and the production efficiency is low; once deviation occurs during the clamping process, it will also lead to internal The arc surface has machining deviation and is scrapped.

Obviously visible. As far as the three machine tool processing methods of the claw body of the high-speed cold-rolled pipe mill are concerned, there are certain deficiencies, which affect the processing accuracy and production efficiency of the claw body.

However, it is not feasible, cost-effective and effective to purchase a dedicated CNC machine tool for the machining of the arc surface in the claw body. Utilizing the advantages of drill bit processing (repairable and high precision), processing on ordinary lathes can not only ensure the processing accuracy, but also improve the processing efficiency. However, because the main axis of the lathe is parallel to the ground, the jaws must be assembled and clamped. machine, and processing together can ensure that the roundness meets the technical requirements. For this reason, it is necessary to use special fixtures to solve this problem according to the characteristics of lathe processing.

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide a lathe fixture for processing the arc surface in the claw body, the lathe fixture is especially suitable for the claws of high-speed cold rolling mills for producing seamless steel pipes and other steel pipes Arc surface processing inside the body. The lathe fixture used for processing the arc surface in the claw body of the utility model is a technical improvement to the existing machine tool processing method. The special tooling fixture is applied to the lathe processing process of the claw body, and the special fixture with the claw body is installed. Carry out the inner arc cutting process on the ordinary C-620 lathe, instead of the original planer, milling machine, drilling machine and other inner arc surface processing methods, the inner arc machining of the claw body is carried out on the ordinary lathe, which effectively solves the problem In the processing of the arc surface of the claw body of the high-speed cold-rolled pipe mill, the lack of special fixtures and fixtures caused problems such as inconvenient processing, low efficiency, and uncontrollable quality. On the basis of ensuring the processing quality, the processing production efficiency was improved; the design Reasonable, compact structure, convenient use and maintenance, accurate and firm positioning, safe and reliable, and strong versatility, it has a certain reference and popularization effect on the improvement of other similar tooling fixtures.

The lathe clamp used for processing the arc surface in the claw body of the utility model is realized as follows:

A lathe fixture used for processing the arc surface of the jaw body, comprising: a faceplate type clamp body, a jaw body support fixed on the processing side of the clamp body, characterized in that the jaw body support is outwardly facing Inclined, fixed on the processing side of the faceplate clamp body in equal parts, the jaw body support is used to clamp and fix the jaw body. The clamping side of the jaw body is a stepped groove body, which is formed in the stepped groove shape It is embedded in the groove of the fixed claw body.

According to the lathe fixture used for processing the arc surface in the claw body according to the utility model, it is characterized in that, the faceplate type clamp body is that the jaw body support is fixed on the processing side of the faceplate type clamp body according to three equal parts.

According to the lathe clamp for processing the arc surface in the claw body according to the utility model, it is characterized in that the groove of the stepped groove body is a rectangular groove, and the bottom of the groove is provided with bolts for fixing the claw body to the claw body Bolt through holes for the support.

According to the lathe fixture used for processing the arc surface in the claw body according to the utility model, the feature is that the faceplate-type clamp body is a stepped cylinder with a through hole in the center, and is fixed on the lathe spindle in a threaded connection. The side of the faceplate-type clamp body of the claw body support forms a rectangular pin for inserting and fixing on one side of the faceplate-type clamp body, and the corresponding side of the faceplate-type clamp body is provided with corresponding rectangular grooves in three equal parts.

According to the lathe clamp for processing the arc surface in the claw body according to the utility model, the feature is that the faceplate clamp body is φ200-250 mm, and the size of the rectangular pin and the rectangular slot is 10-14*6-12 mm.

According to the lathe clamp for processing the arc surface in the claw body according to the utility model, it is characterized in that the faceplate-type clamp body side end surface of the claw body support and the claw body mounting surface of the claw body support are in the shape of The included angle is 65-80°, and the side end surface of the faceplate type clamp body of the claw body support and the outer inclined surface of the claw body support form an included angle of 100-110°.

According to the lathe fixture used for processing the arc surface in the claw body according to the utility model, it is characterized in that the faceplate type clamp body side end surface of the claw body support is a plane of 45-55*35-45mm.

According to the lathe clamp for processing the arc surface in the claw body according to the utility model, it is characterized in that the claw body support adopts rectangular pin positioning and thread connection and is fixed on the processing side of the faceplate-type clamp body.

According to the lathe fixture used for processing the arc surface in the claw body according to the utility model, the feature is that the distance between the center line of the rectangular groove on the faceplate-type clamp body and the center of the cylinder of the faceplate-type clamp body is 100-120mm.

According to the lathe fixture used for processing the arc surface in the jaw body according to the utility model, it is characterized in that the step-shaped cylinder core through hole of the faceplate type clamp body is a through hole of φ60-85mm, and the inner circular surface of the through hole is machined. triangular thread.

According to the lathe fixture used for processing the arc surface in the claw body according to the utility model, it is characterized in that the claw body mounting surface of the claw body support is a stepped groove body, that is, the claw body support A concave groove is formed on one side of the clamping and fixing claw body, which is used to embed and fix the claw body in its groove. There is a groove in the groove body for fixing the claw body bolts to the claw body support bolt holes.

According to the lathe fixture used for processing the arc surface in the claw body of the utility model, the special fixture installed with the claw body can be used to perform inner arc cutting processing on a common C-620 lathe, replacing the original planer, milling machine, and drilling machine. The equal inner arc surface processing method effectively solves the problems of inconvenient processing, low efficiency, and uncontrollable quality caused by the lack of special tooling fixtures in the arc surface processing of the jaws of the high-speed cold-rolled pipe mill. On the basis of processing quality, the processing and production efficiency is improved; the design is reasonable, the structure is compact, the disassembly and assembly are quick, the use and maintenance are convenient, the positioning is accurate and firm, safe and reliable, practical and efficient, and strong in versatility.

A brief description of the drawings

Fig. 1A, B are respectively the sectional view and the right side view of the lathe clamp structure used for machining the arc surface in the claw body of the utility model.

2A and 2B are the front view and the left side view of the faceplate-type clamp body of the lathe clamp used for processing the arc surface in the jaw body of the present invention, respectively.

3A, B, and C are respectively a sectional view, a top view and a left view of the claw body support.

Figure 4A, B are the sectional view and the right side view of the claw body respectively.

Fig. 5 is a schematic diagram of the working state of the lathe fixture used for processing the arc surface in the claw body of the present invention.

1 is the disc type clamp body, 2 is the jaw body support, 3 is the jaw body, 4 is the groove of the jaw body support, 5 is the rectangular pin for fixing the jaw body support, 6 is the faceplate type clamp body The upper part is used to insert the rectangular groove for fixing the rectangular pin used for fixing the claw body support, 7 is the through hole for fixing the claw body on the claw body support, 8 is a bolt or screw, 9 is the lathe spindle, 10 11 is a tool for a lathe headstock, 12 is a lathe tailstock, and 13 is an arc surface in the claw body.

Detailed ways

Hereinafter, examples are given to describe the utility model in detail.

Example 1

On the ordinary C-630 lathe, the high-speed cold rolling mill (SKW-75) has the outlet jaws of φ25mm, φ38mm, and φ42mm and the entrance jaws of φ57mm. The lathe fixture used for processing the arc surface in the claw body of the utility model is an "integral" structure, including: a faceplate type clamp body, a claw body support, screws, washers and the like.

Faceplate clamp body 1 is a φ230*70mm stepped cylinder with holes, made of 45# steel, heat treated and tempered. The processing side of the step-shaped cylinder with holes of the faceplate type chuck body 1 is a cylinder of φ230*30mm, and the surface of the step-shaped cylinder with holes φ230mm (processing side) is processed into three equal parts with a rectangular groove 6 of 14*8mm. The fixed rectangular pin 5 inserted into the fixed claw body support. The distance between the centerline of the rectangular groove and the center of the φ230mm circle is 110mm.

Process φ13*φ8.5mm step-shaped through holes on the cylinder (processing side) of the faceplate clamp body 1 located on both sides of the rectangular groove, respectively, for connecting the rectangular pins with bolts. The step depth is 10mm, the distance between the centers of the two holes is 32mm, the distance between the center of the through hole and φ230mm is 110mm, and the opposite side of the stepped cylinder with holes is a φ100*70mm cylinder. A φ77mm through hole is processed at the core of the stepped cylinder, and an M80*3 triangular thread is processed on the inner surface of the through hole.

The claw body support 2 is composed of 3 pieces. The claw body support 2 is a step-shaped groove body (for rectangular grooves) with a single-sided opening of 125*50*40mm and a round hole (combined with the drawing, the round hole is used to place screws). For placing the claw body 3), the single-sided opening refers to the groove-shaped body formed on one side of the claw body support for clamping and fixing the claw body 3 to form an inner concave groove 4, and the groove-shaped body is used for embedding and fixing the claw body. The claw body is in the groove 4, and the circular hole 7 is a bolt through hole for fixing the claw body bolts to the groove. The claw body support is made of 45# steel, heat treated and tempered.

(Claw body support) The side facing the disc type clamp body is a 25*14*8mm rectangular pin, and the rectangular pin is 1*45° chamfered around the 14*8mm plane, and the top surface side of the clamping and fixing claw body is 100*50*40mm single-sided opening, groove-shaped body with round holes (for bolts to fix the claw body), the groove-shaped body is used to embed and fix the groove of the claw body, the left end surface of the groove-shaped body ( 50*40mm plane) and the top surface (the side that clamps and fixes the jaw body) (100*50mm plane) form an angle of 75°, and two M8*1.25*20mm threaded holes are processed on the end surface for bolts to fix the jaws The body support is on the clamp body. The threaded hole center distance is 32mm.

(the surface of the claw body support installed on the fixture) the left end surface (50*40mm plane) and the top surface side of the clamping and fixing claw body (that is, the surface on the side of the groove where the claw body is installed) (100 *50mm plane) at an angle of 105°, a 35*20mm rectangular groove is processed on the faceplate clamp body (100*50mm plane), and three diameters of φ8.5mm through hole. The centerlines of the three through holes are 13, 38, and 63 mm from the end face (50*40 mm plane) respectively.

The through hole is perpendicular to the top surface, and both ends of the through hole are chamfered.

The screws are composed of 9 pieces, all of which are national standard (GB70-85) fasteners, using M8*35mm inner hexagonal screws; the inner hexagonal screws are composed of 6 pieces, all of which are national standard (GB70-85) fasteners, using M8 *35mm hexagon socket head cap screws; washers are composed of 9 pieces, all of which are national standard (GB97.1-85) fasteners, using φ8mmA type delicate washers, the outer diameter of the washer is φ15mm, the hole diameter is φ8.4mm, and the thickness is 2mm.

When the utility model is used, each component needs to be assembled in place. First, put the faceplate-type clamp body φ230mm vertically upright on the platform, and make the groove opening of the claw body support inward (with three round holes facing outward), that is, the left end face in the figure is downward (the right end face Upward), according to the standard three equal parts placed on the φ230mm end surface of the faceplate clamp body, insert the 25*14*8mm rectangular pin into the rectangular hole on the φ230mm end surface of the faceplate clamp body for positioning.

Then, 6 pieces of M8*35mm inner hexagon screws 8 are put into the φ13*φ8.5mm stepped through holes, and the claw body support 2 is fixed on the φ230mm end surface of the faceplate clamp body 1 through threaded connection. Then, the faceplate type clamp body 1 is directly fixed on the lathe spindle 9 in a threaded connection mode, so that the assembly and production preparation work of the utility model design has been completed, and it can be used on the machine.

When using the lathe fixture of the utility model for processing the arc surface in the claw body on the spot, the three claw bodies are sequentially placed in the three claw body support grooves of the special tooling fixture for the lathe, and the small end of the claw body Facing inward, close to the φ230mm end face of the faceplate clamp body.

The inclined surface of the claw body 3 (with three round holes) is outward, and is close to the bottom plane of the 35*20mm rectangular groove of the claw body support 2, so that the M8*1.25mm threaded hole on the claw body slope and the claw body support The φ8.5mm on the seat overlap each other. Insert 9 pieces of M8*35 inner hexagon screws with φ8mmA type fine washers installed in advance into 9 φ8.5mm round holes of the jaw body support, and screw them into 9 M8*1.25mm threads on the jaw body hole, and use a hexagonal wrench to tighten it.

At this time, the drill bit can be used to drill the jaw body installed on the special tooling fixture, and drill bits with different diameters can be selected according to the specifications; Finishing of the inner arc surface of the body, and 30° chamfering of the arc end face. After the processing is completed, loosen 9 pieces of M8*35 hexagon socket head screws, and the finished jaw body that has completed the machining of the inner arc surface can be disassembled and put into use.

The utility model has reasonable design, compact structure, fast disassembly and assembly, convenient use and maintenance, accurate and firm positioning, safety and reliability, practicality and high efficiency, and strong versatility. It has certain reference, promotion and application value for the improvement of other similar fixtures; The utility model effectively solves the problems of inconvenient processing, low efficiency and uncontrollable quality caused by the lack of special tooling and fixtures in the processing of the arc surface in the claw body of the high-speed cold-rolled pipe mill. On the basis of ensuring the processing quality On, improve processing production efficiency.

Claims (10)

1. A lathe fixture for machining the arc surface in the jaw body, comprising: a faceplate type clamp body (1), a jaw body support (2) fixed on the processing side of the clamp body, it is characterized in that the The claw body support (2) is inclined outward, and is fixed on the processing side of the faceplate type clamp body (1) in equal parts. The claw body support (2) is used for clamping and fixing the jaw body (3). The clamping side of the claw body is a stepped groove body, and a groove (4) for embedded fixing the claw body is formed in the stepped groove body. 2. The lathe fixture for processing the arc surface in the jaw body as claimed in claim 1, wherein the faceplate type clamp body (1) is divided into three equal parts by the jaw body support (2) Fixes to the machined side of the faceplate clamp body. 3. The lathe clamp for processing the arc surface in the jaw body as claimed in claim 1, wherein the step-shaped groove body groove (4) is a rectangular groove, and the bottom of the groove is provided with a groove for placing the jaw The body is fixed to the bolt through hole (7) of the jaw body support with bolts (8). 4. The lathe clamp for processing the arc surface in the jaw as claimed in claim 1, wherein the faceplate-type clamp body (1) is a stepped cylinder with a through hole in the center, and is connected with a screw thread. fixed on the main shaft (9) of the lathe, the side of the faceplate type clamp body of the claw body support forms a rectangular pin (5) for plug-in fixing on one side of the faceplate type clamp body, and the faceplate type clamp body is on the corresponding side Three equal parts are provided with corresponding rectangular grooves (6). 5. The lathe fixture for processing the arc surface in the jaw body as claimed in claim 4, characterized in that, the disc type clamp body is φ200-250mm, and the rectangular pin (5) and rectangular groove (6) The size is 10-14*6-12mm. 6. The lathe clamp for processing the arc surface in the jaw body as claimed in claim 1, wherein the faceplate type clamp body side end surface of the jaw body support and the jaw of the jaw body support The mounting surface of the body is at an included angle of 65-80°, and the faceplate-type clamp body side end surface of the claw body support and the outer inclined surface of the claw body support are at an angle of 100-110°. 7. The lathe clamp for processing the arc surface in the jaw body according to claim 5, characterized in that, the faceplate-type clamp body side end surface of the jaw body support is a plane of 45-55*35-45mm . 8. The lathe clamp for processing the arc surface in the claw body as claimed in claim 1, wherein the claw body support adopts rectangular pin positioning and thread connection and is fixed on the processing side of the faceplate type clamp body superior. 9. The lathe clamp for processing the arc surface in the jaw as claimed in claim 1, wherein the distance between the center line of the rectangular groove on the faceplate type clamp body and the center of the circle of the faceplate type clamp body cylinder is 100- 120mm. 10. The lathe clamp for processing the arc surface in the jaw body as claimed in claim 1, wherein the through hole of the stepped cylinder core of the faceplate type clamp body is a through hole of φ60-85mm, and in the through hole Triangular threads are processed on the inner surface.

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