CN105127893A - Positioning and clamping device for inner hole grinding - Google Patents

Abstract

The invention provides a positioning and clamping device for inner hole grinding, which includes a fixed seat for fixing with the main shaft and a clamping structure for clamping the workpiece, and the clamping structure includes more than two radial clamps for clamping the outer circumference of the workpiece. The surface is used to clamp the ejector rod to clamp the workpiece. The inner hole grinding positioning clamping device also includes a tension spring for providing tension to the workpiece to press the workpiece on the top of the spindle. One end of the tension spring is connected to the fixed seat connected, the other end is hooked with the push rod, and the extension spring is perpendicular to the push rod. The inner hole grinding positioning and clamping device of the present invention directly pulls and clamps the ejector rod and the fixing seat of the workpiece through the spring, and the spring is perpendicular to the ejector rod so that the elastic force of the spring is always parallel to the axis of the workpiece, which greatly simplifies the installation of the entire device. The structure reduces the difficulty of manufacturing and assembly, and the spring force is always parallel to the axis of the workpiece, which also ensures the accurate direction of the workpiece force, no deflection moment, and high precision when grinding the workpiece.

Description

A positioning and clamping device for inner hole grinding

technical field

The invention relates to a positioning and clamping device for inner hole grinding.

Background technique

When grinding the inner hole of rigid shaft parts, the chuck is generally used to clamp one end of the shaft, and the other end of the center frame supports the shaft to align and then grinds the inner hole, or two center frames are used to support the two ends of the shaft respectively, and the center frame is used to align the other end of the shaft. Grinding the inner hole afterward, but both methods have certain problems. The first method is affected by the accuracy of the machine tool chuck itself and the accuracy of the chuck clamping surface, so it is difficult to guarantee the grinding accuracy of the inner hole. When the two methods are used, the shaft parts will move axially, and the center frame close to the head frame is often subjected to torque force, which also has a certain impact on the grinding of the inner hole.

The Chinese invention patent with the authorized announcement number CN204221595U and the authorized announcement date of March 25, 2015 discloses a positioning clamping device for long-axis inner hole grinding. The method of grinding the inner hole by the method of positioning the top at one end avoids the problem of low grinding accuracy caused by the two methods in the prior art, but this device uses the clamping device fixed on the main shaft flange, that is, the fixed seat. The long shaft is tightened on the top of the grinder by cooperating with the heart-shaped hoop. The overall structure of the clamping device is very complicated, and it is very inconvenient to use. At the same time, the wedge-shaped swing rod of the clamping device is used to hook the lever. When the rotation occurs under the force of the spring, an eccentric moment will be caused to the driving rod, which will affect the positioning of the workpiece and the grinding of the inner hole.

Contents of the invention

The object of the present invention is to provide an inner hole grinding positioning and clamping device that directly provides a pressing force for the workpiece to be pressed on the tip through a spring, so as to solve the complex structure of the positioning and clamping device in the prior art, which affects the inner hole. Grinding problem.

In order to solve the above-mentioned technical problems, the positioning and clamping device for inner hole grinding of the present invention adopts the following technical solution: A positioning and clamping device for inner hole grinding, including a fixing seat for fixing the main shaft and a clamp for clamping the workpiece The clamping structure includes more than two ejector pins that radially press against the outer peripheral surface of the workpiece to clamp the workpiece. The extension spring tightly on the top of the main shaft, one end of the extension spring is connected with the fixed seat, and the other end is hooked with the push rod, and the extension spring is perpendicular to the push rod.

The clamping structure includes a snap ring for sheathing on the outer periphery of the workpiece, and the ejector rod is radially screwed on the snap ring.

A hook is screwed on the fixed seat, and the extension spring is connected with the fixed seat through the hook.

The inner hole grinding positioning and clamping device of the present invention directly pulls and clamps the ejector rod and the fixing seat of the workpiece through the spring, and the spring is perpendicular to the ejector rod so that the elastic force of the spring is always parallel to the axis of the workpiece, which greatly simplifies the installation of the entire device. The structure reduces the difficulty of manufacturing and assembly, and the spring force is always parallel to the axis of the workpiece, which also ensures the accurate direction of the workpiece force, no deflection moment, and high precision when grinding the workpiece.

Further, the extension spring is connected with the fixing seat through the hook screwed on the fixing seat, and the pre-tightening force of the extension spring can be adjusted by rotating the hook, which is convenient to control the force of the extension spring on the workpiece through the push rod, which is convenient for adjustment and easy to load and unload. More convenient.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of the positioning and clamping device for inner hole grinding of the present invention.

Detailed ways

Embodiment 1 of the positioning and clamping device for inner hole grinding of the present invention: as shown in Figure 1, it includes a fixed seat 1, which rotates synchronously with the main shaft of the grinding machine, and the spindle tip 6 extends to the right perpendicular to the fixed seat 1 and passes through it. The center position of the fixed seat 1 is assembled with the fixed seat 1 by rotation, and the top of the main shaft 6 is fixed and used as a positioning reference. The fixed seat 1 is provided with more than two hooks 9 around the top of the main shaft 6, and the hooks 9 are screwed on the fixed side by threads. The seat can be adjusted in the left and right directions. The inner hole grinding positioning clamping device also includes a clamping structure for clamping the workpiece 3. The clamping structure includes two radially clamping workpieces 3 outer peripheral surface to clamp the workpiece. Tight push rod 5, in the present embodiment, clamping structure comprises snap ring 4, is provided with radially extending threaded hole on snap ring 4, and push rod 5 is screwed on the screw thread on snap ring 4 by the thread section of its outer periphery. In the hole, when in use, the snap ring 4 is sleeved on the outer periphery of one end of the workpiece, and the outer peripheral surface of the workpiece is tightened by rotating the ejector rod 5 to realize the clamping of the workpiece. The other end is hooked on the extension spring 8 on the rod body of the ejector rod 5. The extension spring 8 provides the workpiece with a pulling force to the left by pulling the ejector rod 4 and makes the positioning taper hole at the end of the workpiece tighten on the spindle tip 6. The ejector rod has a pressing surface for press fit with the outer peripheral surface of the workpiece and a connection part for force transmission connection with the spring, wherein the pressing surface is one end surface of the ejector rod, and the connecting part is the other end of the ejector rod. The adjustment of the hook in the left and right direction can adjust the pre-tightening force of the tension spring, so that the workpiece can be pressed against the top to meet the requirements of positioning and machining accuracy, and there is a certain flexibility between the top of the spindle and a certain axial direction. compensate.

The positioning and clamping device for inner hole grinding also includes a center frame 2 for supporting the other end of the workpiece. When in use, the end surface of the ejector rod 4 presses against the outer peripheral surface of the workpiece, and the workpiece is subjected to a force to the left under the tension of the tension spring. The top of the spindle is tightened on the top, and the other end of the workpiece is inserted into the positioning hole of the center frame. There is an adjustment gap between the inner peripheral surface of the ring and the outer peripheral surface of the workpiece, which will not interfere with the radial adjustment of the workpiece, and the adjustment is more convenient, so that the inner hole at the right end of the workpiece can be processed after alignment. Since the shaft parts generally use the positioning taper holes at both ends as the positioning reference when machining the outer peripheral surface, when the positioning clamping device of the present invention is used to grind the inner hole, the positioning taper hole at the end of the workpiece is also used as the positioning reference. The positioning reference of the surface and the inner hole is unified, which can greatly improve the machining accuracy of the inner hole. On the other hand, the axial limit of the workpiece is realized by the spindle tip, and the machining accuracy is also high when machining the end surface of the inner hole.

On the fixed seat 1, there is a lever 7 extending left and right on one side of the spindle top 6, and the right end of the lever 7 is in contact with the side of the push rod 4. When the fixed seat 1 rotates, the lever 7 rotates accordingly and moves the top. The rod 4 rotates, and the push rod 4 drives the workpiece to rotate by the frictional force against the workpiece to realize the grinding of the inner hole at the right end of the workpiece.

Embodiment 2 of the inner hole grinding positioning and clamping device of the present invention: the difference from Embodiment 1 is that there are two push rods of the clamping structure but are not arranged on the snap ring, and one of the push rods includes a rod body and a The chicken heart clamp is arranged at the end of the rod body. The chicken heart clamp is provided with a threaded hole at the position where the axis of the rod body coincides. The spring hooks the two push rods respectively.

Embodiment 3 of the inner hole grinding positioning and clamping device of the present invention: the difference from Embodiment 1 is that a shackle is fixed on the fixing base, and the end of the extension spring is hooked on the shackle and connected with the shackle. Mount connection.

Embodiment 4 of the inner hole grinding positioning and clamping device of the present invention: the difference from Embodiment 1 is that the clamping structure does not include a snap ring, the end of the ejector rod is provided with an arc-shaped plate, and the inner portion of the arc-shaped plate The arc surface is used for tight fit with the outer peripheral surface of the workpiece.

The positioning and clamping device for inner hole grinding of the present invention has a simple structure and is easy to use. One end of the workpiece is positioned through the top of the spindle and the clamping structure, and the other end of the workpiece is positioned through the center frame. The processed inner hole has high precision and is stable. reliable.

Claims (3)

1. an inner hole grinding positioning clamping device, comprise the holder for fixing with main shaft and the clamping structure for clamping work pieces, described clamping structure comprises the radial top tight workpiece outer peripheral face of two or more with the push rod by Workpiece clamping, it is characterized in that, described inner hole grinding positioning clamping device also comprises for being supplied to workpiece pulling force with by the extension spring of Work-sheet pressing on spindle top, one end of described extension spring is connected with holder, and the other end and push rod hook, described extension spring is vertical with push rod.

2. inner hole grinding positioning clamping device according to claim 1, is characterized in that, described clamping structure comprises the snap ring for being set in Workpiece periphery, and the radial spinning of described push rod is on snap ring.

3. inner hole grinding positioning clamping device according to claim 1 and 2, is characterized in that, described holder is installed with hook, and described extension spring is connected with holder by hook hook.