\begin{figure}
\begin{minipage}[b]{0.5\linewidth} % A minipage that covers half the page
\centering
\includegraphics[width=3cm]{figures/framework.pdf}
\caption{\label{framwork}Framework}
\end{minipage}
\hspace{0.5cm} % To get a little bit of space between the figures
\begin{minipage}[b]{0.5\linewidth}
\centering
\includegraphics[width=3cm]{figures/frame_grip.pdf}
\caption{\label{frame_grip}Frame fixture}
\end{minipage}
\hspace{0.5cm} % To get a little bit of space between the figures
\begin{minipage}[b]{0.5\linewidth}
\centering
\includegraphics[width=3cm]{figures/brace.pdf}
\caption{\label{brace}Brace}
\end{minipage}
\end{figure}