Broach machine

Abstract

To suppress adhesion of a coolant to a workpiece and scattering of the coolant in a process machine, and reduce cost for the coolant while facilitating cleaning work.SOLUTION: A broach machine 100 for cutting the inner surface 104a of a workpiece 104 by a broach cutter 102 having multiple cutting edges 102a in the outer periphery comprises: a reference metal 110 on which the workpiece 104 is placed and into which the broach cutter 102 is inserted; a funnel 120 which is placed on the workpiece 104 placed on the reference metal 110 and which stores a coolant 10; and a lift device 130 that lifts the funnel 120 with respect to the workpiece 104. The funnel 120 opens at an upper part and is disposed coaxially with the workpiece 104. The broach cutter 102 simultaneously penetrates the workpiece 104, the funnel 120, and the reference metal 110, and machines the inner surface of the workpiece.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a broaching machine that cuts the inner surface of a workpiece by linear motion of a broach cutter. [Background technology]

[0002] A broaching machine is a machine tool that uses a tool called a broach (broach cutter) to cut the inner and outer surfaces of a workpiece. A broach cutter is a long, rod-shaped tool with many cutting edges lined up around its periphery. In particular, the dimensions of a broach cutter gradually increase (heighten) from the cutting edge at the tip (roughing edge) to the cutting edge at the end (finishing edge) so that all cutting edges come into contact with the workpiece when moving linearly.

[0003] Broaching machines using such broach cutters can complete rough cutting and finish cutting of a workpiece by simply driving the broach cutter in a linear direction once, and are widely used in today's mass production sites.

[0004] For example, Patent Document 1 discloses a broaching method in which "a workpiece having a pilot hole formed in a portion thereof is placed on a support table with the central axis of the pilot hole oriented in the up-down direction, and then a broach that is mounted so as to be able to rise and fall relative to the support table is lowered, and with the broach inserted into the pilot hole, the inner peripheral surface of the pilot hole is cut in the axial direction with a blade formed on a portion of the outer peripheral surface of the broach."

[0005] Patent Document 1 describes a feature of the invention, "When the broach is in an elevated state, a receiving member is inserted above the support table and below the broach, and foreign matter that adheres to the broach and falls downward is prevented from adhering to the upper surface of the support table and the workpiece placed on the upper surface of the support table." Patent Document 1 also describes that "when broaching a pilot hole formed in a workpiece, foreign matter that has adhered to the broach can be prevented from falling or dripping downward and adhering to the workpiece." [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-196324 Summary of the Invention [Problem to be solved by the invention]

[0007] When cutting a workpiece using a broaching machine, a large amount of coolant is supplied to the cutting area. When cutting fluid is used as the coolant, if the coolant is taken out of the processing machine, cleaning it up is extremely time-consuming and increases the amount of coolant wasted, which contributes to increased costs. In addition, to remove coolant adhering to the workpiece, washing with a washer or air blowing is performed, but washing machines are expensive and using air blowing leaves a lot of oil residue. The technology in Patent Document 1 could not solve these problems, so the development of a new technology was required.

[0008] In view of these problems, the present invention aims to provide a broaching machine that can prevent coolant from adhering to the workpiece and splashing into the processing machine, making cleaning easier and reducing the cost of coolant. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, a typical configuration of a broaching machine according to the present invention is a broaching machine that cuts the inner surface of a workpiece by the linear motion of a broach cutter having multiple cutting edges on its outer periphery, and is characterized by comprising: a base die on which the workpiece is placed and on which the broach cutter is inserted; a funnel that is placed on the workpiece placed on the base die and that stores coolant; and a lift device that raises and lowers the funnel relative to the workpiece, the funnel being open at the top and positioned coaxially with the workpiece, and the broach cutter simultaneously penetrating the workpiece, funnel, and base die to machine the inner surface of the workpiece.

[0010] The funnel may be provided at its lower portion with a flexible member that contacts the upper surface of the workpiece to seal the gap.

[0011] The lifting device has an arm that supports the funnel from below and a pin that is attached to the arm and protrudes upward, and the base plate of the funnel has a boss hole into which the pin fits loosely, so that the funnel is left on the workpiece when the arm is lowered. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a broaching machine that can prevent coolant from adhering to the workpiece and from splashing into the machining machine, making cleaning easier and reducing the cost required for coolant. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a diagram illustrating a broaching machine according to the present embodiment. [Figure 2] FIG. 10 is a diagram illustrating the rising and falling of a funnel. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0015] 1 is a diagram illustrating a broaching machine 100 according to this embodiment. The broaching machine 100 is a machine tool that cuts an inner surface 104a of a workpiece 104 by the linear motion of a broach cutter 102. The broach cutter 102 is a long, rod-shaped tool with a structure in which many cutting edges 102a are arranged on the outer periphery.

[0016] The broach cutter 102 has gradually larger (higher) dimensions from the cutting edge (rough edge) at the tip end to the cutting edge (finishing edge) at the end end so that all cutting edges 102a come into contact with the workpiece 104 when moving linearly. Therefore, the broaching machine 100 can complete rough cutting to finish cutting of the workpiece 104 by simply driving the broach cutter 102 in a linear direction once.

[0017] 1, the broaching machine 100 of this embodiment includes a die 110, a funnel 120, and a lifting device 130. A workpiece 104 is placed on the die 110, and a broach cutter 102 is inserted in the broaching direction as shown in the figure. The die 110 also has a guide pin 112 that guides the position of the workpiece 104.

[0018] As a feature of this embodiment, a funnel 120 is placed on the workpiece 104 placed on the reference metal 110. The funnel 120 is open at the top and is arranged coaxially with the workpiece 104. The funnel 120 is raised and lowered relative to the workpiece 104 by a lift device 130.

[0019] 1, the lift device 130 has an arm 132 that supports the funnel 120 from below, and a pin 134 that is provided on the arm 132 and protrudes upward. Meanwhile, a boss hole 122 into which the pin fits loosely is formed in the base plate 126 of the funnel 120. As a result, the pin 134 fits loosely into the boss hole 122, thereby guiding the funnel 120 to a predetermined position and effectively preventing the funnel 120 from falling off the arm 132.

[0020] 2 is a diagram illustrating the raising and lowering of the funnel 120. When processing the workpiece 104, the workpiece 104 is first placed on the base metal 110 as shown in FIG. 2(a). Meanwhile, the lift device 130 supports the funnel 120 from below with the arm 132. At this point, the arm 132 is in the raised position.

[0021] 2(b), the arm 132 moves to a lowered position, leaving the funnel 120 on the workpiece 104. At this time, the base plate 126 is floating above the arm 132, and the pin 134 of the arm 132 is fitted into the boss hole 122 of the base plate 126 attached to the bottom of the funnel 120. The bottom of the funnel 120 is provided with a flexible member 124 (such as polyurethane) that abuts against the top surface of the workpiece 104 and seals the gap. This reliably prevents the coolant 10 from adhering to the outer peripheral surface 104b of the workpiece 104.

[0022] After the funnel 120 is left on the workpiece as described above, the broach cutter 102 is moved in the broach cutting direction relative to the workpiece 104, and the broach cutter 102 cuts the inner surface 104a of the workpiece 104 while simultaneously penetrating the workpiece 104 and the funnel 120. At this time, a large amount of coolant 10 is supplied to the inner surface 104a of the workpiece 104 and the cutting portion of the broach cutter 102.

[0023] According to the broaching machine 100 of this embodiment, the funnel 120 is left on the workpiece 104, so that adhesion of the coolant 10 to the outer peripheral surface 104b of the workpiece 104 can be suitably suppressed.

[0024] The coolant 10 flows into the funnel 120 and is stored there, and as the broach cutter 102 advances, it passes over the inner surface 104a of the workpiece 104 and flows downward from the workpiece 104 (inside the broaching machine 100). This effectively prevents the coolant 10 from scattering onto the outer peripheral surface 104b of the workpiece 104 or the surrounding area, dramatically facilitating cleaning work. Furthermore, because the coolant 10 is effectively discharged into the broaching machine 100, it can be efficiently recovered and reused. This reduces the loss of coolant 10, contributing to cost reduction. [Industrial Applicability]

[0025] The present invention is applicable to a broaching machine that cuts the inner surface of a workpiece by linear motion of a broach cutter. [Explanation of symbols]

[0026] 10...coolant, 100...broaching machine, 102...broach cutter, 102a...cutting edge, 104...workpiece, 104a...inner surface, 104b...outer surface, 110...reference metal, 112...guide pin, 120...funnel, 122...boss hole, 124...flexible member, 126...base plate, 130...lifting device, 132...arm, 134...pin

Claims

1. In a broaching machine that cuts the inner surface of a workpiece by the linear motion of a broach cutter that has multiple cutting edges on its outer periphery, a reference die on which the workpiece is placed and into which the broach cutter is inserted; a funnel that is placed on the workpiece placed on the reference metal and that stores coolant; a lift device that raises and lowers the funnel relative to the workpiece; Equipped with The funnel is open at the top and is arranged coaxially with the workpiece; A broaching machine characterized in that the broach cutter simultaneously penetrates the workpiece, the funnel, and the reference die to machine the inner surface of the workpiece.

2. 2. The broaching machine according to claim 1, wherein a flexible member is provided at a lower portion of the funnel to abut against an upper surface of the workpiece and seal the gap.

3. The lift device is an arm that supports the funnel from below; a pin provided on the arm and protruding upward; and The base plate of the funnel has a boss hole into which the pin is loosely fitted, 3. The broaching machine according to claim 1, wherein the funnel is left on the workpiece by the arm being lowered.

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